Zettelstore Client

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Difference From trunk To v0.11.0

2024-07-11
16:29
Remove "rename" operation and associated constants ... (Leaf check-in: a203b14b7e user: stern tags: trunk)
14:40
Version 0.18.0 ... (check-in: b141c81ad9 user: stern tags: release, trunk, v0.18.0)
2023-04-02
16:14
Add metadata key 'expire' ... (check-in: e11f223228 user: stern tags: trunk)
2023-03-27
14:37
Version 0.11.0 ... (check-in: 331cad470c user: stern tags: release, trunk, v0.11.0)
14:34
Version 0.11.0 ... (check-in: 712c21afc8 user: stern tags: release, trunk, v0.10.0)

Added .github/dependabot.yml.













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# To get started with Dependabot version updates, you'll need to specify which
# package ecosystems to update and where the package manifests are located.
# Please see the documentation for all configuration options:
# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates

version: 2
updates:
  - package-ecosystem: "gomod" # See documentation for possible values
    directory: "/" # Location of package manifests
    schedule:
      interval: "daily"
    rebase-strategy: "disabled"

Changes to api/api.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2021-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2021-present Detlef Stern
//-----------------------------------------------------------------------------

// Package api contains common definitions used for client and server.
package api

// ZettelID contains the identifier of a zettel. It is a string with 14 digits.
type ZettelID string

// InvalidZID is an invalid zettel identifier
// InvalidZID is an invalif zettel identifier
const InvalidZID = ""

// IsValid returns true, if the idenfifier contains 14 digits.
func (zid ZettelID) IsValid() bool {
	if len(zid) != 14 {
		return false
	}
	for i := range 14 {
	for i := 0; i < 14; i++ {
		ch := zid[i]
		if ch < '0' || '9' < ch {
			return false
		}
	}
	return true
}

// ZettelMeta is a map containg the metadata of a zettel.
type ZettelMeta map[string]string

// ZettelRights is an integer that encode access rights for a zettel.
type ZettelRights uint8

// Values for ZettelRights, can be or-ed
const (
	ZettelCanNone   ZettelRights = 1 << iota
	ZettelCanCreate              // Current user is allowed to create a new zettel
	ZettelCanRead                // Requesting user is allowed to read the zettel
	ZettelCanWrite               // Requesting user is allowed to update the zettel
	placeholder_1                // Was assigned to rename right, which is now removed
	ZettelCanRename              // Requesting user is allowed to provide the zettel with a new identifier
	ZettelCanDelete              // Requesting user is allowed to delete the zettel
)
	ZettelMaxRight               // Sentinel value
)

// MetaRights contains the metadata of a zettel, and its rights.
type MetaRights struct {
	Meta   ZettelMeta
	Rights ZettelRights

// AuthJSON contains the result of an authentication call.
type AuthJSON struct {
	Token   string `json:"token"`
	Type    string `json:"token_type"`
	Expires int    `json:"expires_in"`
}

// ZidJSON contains the identifier data of a zettel.
type ZidJSON struct {
	ID ZettelID `json:"id"`
}

// MetaJSON contains the metadata of a zettel.
type MetaJSON struct {
	Meta   ZettelMeta   `json:"meta"`
	Rights ZettelRights `json:"rights"`
}

// ZidMetaJSON contains the identifier and the metadata of a zettel.
type ZidMetaJSON struct {
	ID     ZettelID     `json:"id"`
	Meta   ZettelMeta   `json:"meta"`
	Rights ZettelRights `json:"rights"`
}
// ZidMetaRights contains the identifier, the metadata of a zettel, and its rights.
type ZidMetaRights struct {
	ID     ZettelID
	Meta   ZettelMeta
	Rights ZettelRights

// ZidMetaRelatedList contains identifier/metadata of a zettel and the same for related zettel
type ZidMetaRelatedList struct {
	ID     ZettelID      `json:"id"`
	Meta   ZettelMeta    `json:"meta"`
	Rights ZettelRights  `json:"rights"`
	List   []ZidMetaJSON `json:"list"`
}

// ZettelData contains all data for a zettel.
type ZettelData struct {
	Meta     ZettelMeta
// ZettelDataJSON contains all data for a zettel.
type ZettelDataJSON struct {
	Meta     ZettelMeta `json:"meta"`
	Rights   ZettelRights
	Encoding string
	Content  string
	Encoding string     `json:"encoding"`
	Content  string     `json:"content"`
}

// ZettelJSON contains all data for a zettel, the identifier, the metadata, and the content.
type ZettelJSON struct {
	ID       ZettelID     `json:"id"`
	Meta     ZettelMeta   `json:"meta"`
	Encoding string       `json:"encoding"`
	Content  string       `json:"content"`
	Rights   ZettelRights `json:"rights"`
}

// ZettelContentJSON contains all elements to transfer the content of a zettel.
type ZettelContentJSON struct {
	Encoding string `json:"encoding"`
	Content  string `json:"content"`
}

// ZettelListJSON contains data for a zettel list.
type ZettelListJSON struct {
	Query string        `json:"query"`
	Human string        `json:"human"`
	List  []ZidMetaJSON `json:"list"`
}

// Aggregate maps metadata keys to list of zettel identifier.
type Aggregate map[string][]ZettelID
// MapMeta maps metadata keys to list of metadata.
type MapMeta map[string][]ZettelID

// MapListJSON specifies the map of metadata key to list of metadata that contains the key.
type MapListJSON struct {
	Map MapMeta `json:"map"`
}

// VersionJSON contains version information.
type VersionJSON struct {
	Major int    `json:"major"`
	Minor int    `json:"minor"`
	Patch int    `json:"patch"`
	Info  string `json:"info"`
	Hash  string `json:"hash"`
}

Changes to api/const.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2021-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2021-present Detlef Stern
//-----------------------------------------------------------------------------

package api

import "fmt"

// Predefined Zettel Identifier
const (
	// System zettel
	ZidVersion              = ZettelID("00000000000001") // -> 0001
	ZidHost                 = ZettelID("00000000000002") // -> 0002
	ZidOperatingSystem      = ZettelID("00000000000003") // -> 0003
	ZidLicense              = ZettelID("00000000000004") // -> 0004
	ZidAuthors              = ZettelID("00000000000005") // -> 0005
	ZidDependencies         = ZettelID("00000000000006") // -> 0006
	ZidLog                  = ZettelID("00000000000007") // -> 0007
	ZidVersion              = ZettelID("00000000000001")
	ZidHost                 = ZettelID("00000000000002")
	ZidOperatingSystem      = ZettelID("00000000000003")
	ZidLicense              = ZettelID("00000000000004")
	ZidAuthors              = ZettelID("00000000000005")
	ZidDependencies         = ZettelID("00000000000006")
	ZidLog                  = ZettelID("00000000000007")
	ZidMemory               = ZettelID("00000000000008") // -> 0008
	ZidSx                   = ZettelID("00000000000009") // -> 0009
	ZidHTTP                 = ZettelID("00000000000010") // -> 000a
	ZidAPI                  = ZettelID("00000000000011") // -> 000b
	ZidWebUI                = ZettelID("00000000000012") // -> 000c
	ZidConsole              = ZettelID("00000000000013") // -> 000d
	ZidBoxManager           = ZettelID("00000000000020") // -> 000e
	ZidBoxManager           = ZettelID("00000000000020")
	ZidZettel               = ZettelID("00000000000021") // -> 000f
	ZidIndex                = ZettelID("00000000000022") // -> 000g
	ZidQuery                = ZettelID("00000000000023") // -> 000h
	ZidMetadataKey          = ZettelID("00000000000090") // -> 000i
	ZidParser               = ZettelID("00000000000092") // -> 000j
	ZidStartupConfiguration = ZettelID("00000000000096") // -> 000k
	ZidConfiguration        = ZettelID("00000000000100") // -> 000l
	ZidMetadataKey          = ZettelID("00000000000090")
	ZidParser               = ZettelID("00000000000092")
	ZidStartupConfiguration = ZettelID("00000000000096")
	ZidConfiguration        = ZettelID("00000000000100")
	ZidDirectory            = ZettelID("00000000000101") // -> 000m
	ZidWarnings             = ZettelID("00000000000102") // -> 000n

	// WebUI HTML templates are in the range 10000..19999
	ZidBaseTemplate   = ZettelID("00000000010100") // -> 000s
	ZidLoginTemplate  = ZettelID("00000000010200") // -> 000t
	ZidListTemplate   = ZettelID("00000000010300") // -> 000u
	ZidZettelTemplate = ZettelID("00000000010401") // -> 000v
	ZidInfoTemplate   = ZettelID("00000000010402") // -> 000w
	ZidFormTemplate   = ZettelID("00000000010403") // -> 000x
	ZidDeleteTemplate = ZettelID("00000000010405") // -> 000y
	ZidErrorTemplate  = ZettelID("00000000010700") // -> 000z
	ZidBaseTemplate    = ZettelID("00000000010100")
	ZidLoginTemplate   = ZettelID("00000000010200")
	ZidListTemplate    = ZettelID("00000000010300")
	ZidZettelTemplate  = ZettelID("00000000010401")
	ZidInfoTemplate    = ZettelID("00000000010402")
	ZidFormTemplate    = ZettelID("00000000010403")
	ZidRenameTemplate  = ZettelID("00000000010404")
	ZidDeleteTemplate  = ZettelID("00000000010405")

	// WebUI sxn code zettel are in the range 19000..19999
	ZidSxnStart = ZettelID("00000000019000") // -> 000q
	ZidSxnBase  = ZettelID("00000000019990") // -> 000r
	ZidContextTemplate = ZettelID("00000000010406")
	ZidErrorTemplate   = ZettelID("00000000010700")

	// CSS-related zettel are in the range 20000..29999
	ZidBaseCSS = ZettelID("00000000020001") // -> 0010
	ZidUserCSS = ZettelID("00000000025001") // -> 0011
	ZidBaseCSS    = ZettelID("00000000020001")
	ZidUserCSS    = ZettelID("00000000025001")
	ZidRoleCSSMap = ZettelID("00000000029000") // Maps roles to CSS zettel, which should be in the range 29001..29999.

	// WebUI JS zettel are in the range 30000..39999

	// WebUI image zettel are in the range 40000..49999
	ZidEmoji = ZettelID("00000000040001") // -> 000o
	ZidEmoji = ZettelID("00000000040001")

	// Other sxn code zettel are in the range 50000..59999
	ZidSxnPrelude = ZettelID("00000000059900") // -> 000p

	// Predefined Zettelmarkup zettel are in the range 60000..69999
	ZidRoleZettelZettel        = ZettelID("00000000060010") // -> 0012
	ZidRoleConfigurationZettel = ZettelID("00000000060020") // -> 0013
	ZidRoleRoleZettel          = ZettelID("00000000060030") // -> 0014
	ZidRoleTagZettel           = ZettelID("00000000060040") // -> 0015

	// Range 90000...99999 is reserved for zettel templates
	ZidTOCNewTemplate    = ZettelID("00000000090000") // -> 0016
	ZidTemplateNewZettel = ZettelID("00000000090001") // -> 0017
	ZidTOCNewTemplate    = ZettelID("00000000090000")
	ZidTemplateNewZettel = ZettelID("00000000090001")
	ZidTemplateNewRole   = ZettelID("00000000090004") // -> 001a
	ZidTemplateNewTag    = ZettelID("00000000090003") // -> 0019
	ZidTemplateNewUser   = ZettelID("00000000090002") // -> 0018
	ZidTemplateNewUser   = ZettelID("00000000090002")

	ZidSession      = ZettelID("00009999999997") // -> 00zx
	ZidAppDirectory = ZettelID("00009999999998") // -> 00zy
	ZidMapping      = ZettelID("00009999999999") // -> 00zz
	ZidDefaultHome  = ZettelID("00010000000000") // -> 0100
	ZidDefaultHome = ZettelID("00010000000000")
)

// LengthZid factors the constant length of a zettel identifier
const LengthZid = len(ZidDefaultHome)

// Values of the metadata key/value type.
const (
	MetaCredential   = "Credential"
	MetaEmpty        = "EString"
	MetaID           = "Identifier"
	MetaIDSet        = "IdentifierSet"
	MetaNumber       = "Number"
	MetaString       = "String"
	MetaTagSet       = "TagSet"
	MetaTimestamp    = "Timestamp"
	MetaURL          = "URL"
	MetaWord         = "Word"
	MetaWordSet      = "WordSet"
	MetaZettelmarkup = "Zettelmarkup"
)

// Predefined general Metadata keys
const (
	KeyID           = "id"
	KeyTitle        = "title"
	KeyRole         = "role"
	KeyTags         = "tags"
	KeySyntax       = "syntax"
	KeyAuthor       = "author"
	KeyBack         = "back"
	KeyBackward     = "backward"
	KeyBoxNumber    = "box-number"
	KeyCopyright    = "copyright"
	KeyCreated      = "created"
	KeyCredential   = "credential"
	KeyDead         = "dead"
	KeyExpire       = "expire"
	KeyFolge        = "folge"
	KeyFolgeRole    = "folge-role"
	KeyForward      = "forward"
	KeyLang         = "lang"
	KeyLicense      = "license"
	KeyModified     = "modified"
	KeyPrecursor    = "precursor"
	KeyPredecessor  = "predecessor"
	KeyPublished    = "published"
	KeyQuery        = "query"
	KeyReadOnly     = "read-only"
	KeySubordinates = "subordinates"
	KeySuccessors   = "successors"
	KeySuperior     = "superior"
	KeySummary      = "summary"
	KeyURL          = "url"
	KeyUselessFiles = "useless-files"
	KeyUserID       = "user-id"
	KeyUserRole     = "user-role"
	KeyVisibility   = "visibility"
)

// Predefined Metadata values
const (
	ValueFalse             = "false"
	ValueTrue              = "true"
	ValueLangEN            = "en"
	ValueRoleConfiguration = "configuration"
	ValueRoleTag           = "tag"
	ValueRoleRole          = "role"
	ValueRoleZettel        = "zettel"
	ValueSyntaxCSS         = "css"
	ValueSyntaxDraw        = "draw"
	ValueSyntaxGif         = "gif"
	ValueSyntaxHTML        = "html"
	ValueSyntaxMarkdown    = "markdown"
	ValueSyntaxMD          = "md"
	ValueSyntaxMustache    = "mustache"
	ValueSyntaxNone        = "none"
	ValueSyntaxSVG         = "svg"
	ValueSyntaxSxn         = "sxn"
	ValueSyntaxText        = "text"
	ValueSyntaxZmk         = "zmk"
	ValueUserRoleCreator   = "creator"
	ValueUserRoleOwner     = "owner"
	ValueUserRoleReader    = "reader"
	ValueUserRoleWriter    = "writer"
	ValueVisibilityCreator = "creator"
	ValueVisibilityExpert  = "expert"
	ValueVisibilityLogin   = "login"
	ValueVisibilityOwner   = "owner"
	ValueVisibilityPublic  = "public"
)

// Additional HTTP constants.
const (
	MethodMove = "MOVE" // HTTP method for renaming a zettel

	HeaderAccept      = "Accept"
	HeaderContentType = "Content-Type"
	HeaderDestination = "Destination"
	HeaderLocation    = "Location"
)

// Values for HTTP query parameter.
const (
	QueryKeyCommand   = "cmd"
	QueryKeyCost      = "cost"
	QueryKeyDir       = "dir"
	QueryKeyEncoding  = "enc"
	QueryKeyParseOnly = "parseonly"
	QueryKeyLimit     = "limit"
	QueryKeyPart      = "part"
	QueryKeyPhrase    = "phrase"
	QueryKeyQuery     = "q"
	QueryKeyRole      = "role"
	QueryKeySeed      = "_seed"
)
	QueryKeyTag       = "tag"

// Supported dir values.
const (
	DirBackward = "backward"
	DirForward  = "forward"
)

// Supported encoding values.
const (
	EncodingHTML  = "html"
	EncodingMD    = "md"
	EncodingSexpr = "sexpr"
	EncodingSHTML = "shtml"
	EncodingSz    = "sz"
	EncodingText  = "text"
	EncodingZMK   = "zmk"

	EncodingPlain = "plain"
	EncodingData  = "data"
	EncodingJson  = "json"
)

var mapEncodingEnum = map[string]EncodingEnum{
	EncodingHTML:  EncoderHTML,
	EncodingMD:    EncoderMD,
	EncodingSexpr: EncoderSexpr,
	EncodingSHTML: EncoderSHTML,
	EncodingSz:    EncoderSz,
	EncodingText:  EncoderText,
	EncodingZMK:   EncoderZmk,

	EncodingPlain: EncoderPlain,
	EncodingData:  EncoderData,
	EncodingJson:  EncoderJson,
}
var mapEnumEncoding = map[EncodingEnum]string{}

func init() {
	for k, v := range mapEncodingEnum {
		mapEnumEncoding[v] = k
	}
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type EncodingEnum uint8

// Values for EncoderEnum
const (
	EncoderUnknown EncodingEnum = iota
	EncoderHTML
	EncoderMD
	EncoderSHTML
	EncoderSz
	EncoderSexpr
	EncoderSHTML
	EncoderText
	EncoderZmk

	EncoderPlain
	EncoderData
	EncoderJson
)

// String representation of an encoder key.
func (e EncodingEnum) String() string {
	if f, ok := mapEnumEncoding[e]; ok {
		return f
	}
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const (
	CommandAuthenticated = Command("authenticated")
	CommandRefresh       = Command("refresh")
)

// Supported search operator representations
const (
	BackwardDirective = "BACKWARD"
	ContextDirective  = "CONTEXT"
	CostDirective     = "COST"
	ForwardDirective  = "FORWARD"
	FullDirective     = "FULL"
	IdentDirective    = "IDENT"
	ItemsDirective    = "ITEMS"
	MaxDirective      = "MAX"
	LimitDirective    = "LIMIT"
	OffsetDirective   = "OFFSET"
	OrDirective       = "OR"
	OrderDirective    = "ORDER"
	PhraseDirective   = "PHRASE"
	PickDirective     = "PICK"
	RandomDirective   = "RANDOM"
	ReverseDirective  = "REVERSE"
	UnlinkedDirective = "UNLINKED"

	ActionSeparator = "|"
	ActionSeparator        = "|"

	AtomAction     = "ATOM"
	KeysAction     = "KEYS"
	MinAction      = "MIN"
	MaxAction      = "MAX"
	NumberedAction = "NUMBERED"
	RedirectAction = "REDIRECT"
	ReIndexAction  = "REINDEX"
	RSSAction      = "RSS"
	TitleAction    = "TITLE"

	ExistOperator    = "?"
	ExistNotOperator = "!?"
	ExistOperator          = "?"
	ExistNotOperator       = "!?"

	SearchOperatorNot        = "!"
	SearchOperatorNot      = "!"
	SearchOperatorEqual      = "="
	SearchOperatorNotEqual   = "!="
	SearchOperatorHas        = ":"
	SearchOperatorHasNot     = "!:"
	SearchOperatorPrefix     = "["
	SearchOperatorNoPrefix   = "!["
	SearchOperatorSuffix     = "]"
	SearchOperatorNoSuffix   = "!]"
	SearchOperatorMatch      = "~"
	SearchOperatorNoMatch    = "!~"
	SearchOperatorHas      = ":"
	SearchOperatorHasNot   = "!:"
	SearchOperatorPrefix   = ">"
	SearchOperatorNoPrefix = "!>"
	SearchOperatorSuffix   = "<"
	SearchOperatorNoSuffix = "!<"
	SearchOperatorMatch    = "~"
	SearchOperatorNoMatch  = "!~"
	SearchOperatorLess       = "<"
	SearchOperatorNotLess    = "!<"
	SearchOperatorGreater    = ">"
	SearchOperatorNotGreater = "!>"
)

// QueryPrefix is the prefix that denotes a query expression within a reference.
const QueryPrefix = "query:"

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//-----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
//-----------------------------------------------------------------------------

package api

import "t73f.de/r/webs/urlbuilder"
import (
	"net/url"
	"strings"
)

type urlQuery struct{ key, val string }

// URLBuilder should be used to create zettelstore URLs.
type URLBuilder struct {
	base   urlbuilder.URLBuilder
	prefix string
	prefix   string
	key      byte
	rawLocal string
	path     []string
	query    []urlQuery
	fragment string
}

// NewURLBuilder creates a new URL builder with the given prefix and key.
func NewURLBuilder(prefix string, key byte) *URLBuilder {
	for len(prefix) > 0 && prefix[len(prefix)-1] == '/' {
		prefix = prefix[0 : len(prefix)-1]
	}
	result := URLBuilder{prefix: prefix}
	return &URLBuilder{prefix: prefix, key: key}
	if key != '/' {
		result.base.AddPath(string([]byte{key}))
	}
	return &result
}

// Clone an URLBuilder
func (ub *URLBuilder) Clone() *URLBuilder {
	cpy := new(URLBuilder)
	ub.base.Copy(&cpy.base)
	cpy.prefix = ub.prefix
	cpy.key = ub.key
	if len(ub.path) > 0 {
		cpy.path = make([]string, 0, len(ub.path))
		cpy.path = append(cpy.path, ub.path...)
	}
	if len(ub.query) > 0 {
		cpy.query = make([]urlQuery, 0, len(ub.query))
		cpy.query = append(cpy.query, ub.query...)
	}
	cpy.fragment = ub.fragment
	return cpy
}

// SetRawLocal sets everything that follows the prefix / key.
func (ub *URLBuilder) SetRawLocal(rawLocal string) *URLBuilder {
	for len(rawLocal) > 0 && rawLocal[0] == '/' {
		rawLocal = rawLocal[1:]
	}
	ub.rawLocal = rawLocal
	ub.path = nil
	ub.query = nil
	ub.fragment = ""
	return ub
}

// SetZid sets the zettel identifier.
func (ub *URLBuilder) SetZid(zid ZettelID) *URLBuilder {
	if len(ub.path) > 0 {
		panic("Cannot add Zid")
	}
	ub.rawLocal = ""
	ub.base.AddPath(string(zid))
	ub.path = append(ub.path, string(zid))
	return ub
}

// AppendPath adds a new path element
func (ub *URLBuilder) AppendPath(p string) *URLBuilder {
	ub.base.AddPath(p)
	ub.rawLocal = ""
	for len(p) > 0 && p[0] == '/' {
		p = p[1:]
	}
	if p != "" {
		ub.path = append(ub.path, p)
	}
	return ub
}

// AppendKVQuery adds a new key/value query parameter
func (ub *URLBuilder) AppendKVQuery(key, value string) *URLBuilder {
	ub.rawLocal = ""
	ub.base.AddQuery(key, value)
	ub.query = append(ub.query, urlQuery{key, value})
	return ub
}

// AppendQuery adds a new query
func (ub *URLBuilder) AppendQuery(value string) *URLBuilder {
	if value != "" {
		ub.base.AddQuery(QueryKeyQuery, value)
	ub.rawLocal = ""
	ub.query = append(ub.query, urlQuery{QueryKeyQuery, value})
	}
	return ub
}

// ClearQuery removes all query parameters.
func (ub *URLBuilder) ClearQuery() *URLBuilder {
	ub.rawLocal = ""
	ub.base.RemoveQueries()
	ub.query = nil
	ub.fragment = ""
	return ub
}

// SetFragment stores the fragment
func (ub *URLBuilder) SetFragment(s string) *URLBuilder {
	ub.rawLocal = ""
	ub.base.SetFragment(s)
	ub.fragment = s
	return ub
}

// String produces a string value.
func (ub *URLBuilder) String() string {
	return ub.prefix + ub.base.String()
	return ub.asString("&")
}

// AttrString returns the string value of the URL suitable to be placed in a HTML attribute.
func (ub *URLBuilder) AttrString() string {
	return ub.asString("&amp;")
}

func (ub *URLBuilder) asString(qsep string) string {
	var sb strings.Builder

	sb.WriteString(ub.prefix)
	if ub.key != '/' {
		sb.WriteByte(ub.key)
	}
	if ub.rawLocal != "" {
		sb.WriteString(ub.rawLocal)
		return sb.String()
	}
	for i, p := range ub.path {
		if i > 0 || ub.key != '/' {
			sb.WriteByte('/')
		}
		sb.WriteString(url.PathEscape(p))
	}
	if len(ub.fragment) > 0 {
		sb.WriteByte('#')
		sb.WriteString(ub.fragment)
	}
	for i, q := range ub.query {
		if i == 0 {
			sb.WriteByte('?')
		} else {
			sb.WriteString(qsep)
		}
		sb.WriteString(q.key)
		if val := q.val; val != "" {
			sb.WriteByte('=')
			sb.WriteString(url.QueryEscape(val))
		}
	}
	return sb.String()
}

Changes to attrs/attrs.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
//-----------------------------------------------------------------------------

// Package attrs stores attributes of zettel parts.
package attrs

import (
	"strings"

	"t73f.de/r/zsc/maps"
	"zettelstore.de/c/maps"
)

// Attributes store additional information about some node types.
type Attributes map[string]string

// IsEmpty returns true if there are no attributes.
func (a Attributes) IsEmpty() bool { return len(a) == 0 }

Changes to attrs/attrs_test.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
//-----------------------------------------------------------------------------

package attrs_test

import (
	"testing"

	"t73f.de/r/zsc/attrs"
	"zettelstore.de/c/attrs"
)

func TestHasDefault(t *testing.T) {
	t.Parallel()
	attr := attrs.Attributes{}
	if attr.HasDefault() {
		t.Error("Should not have default attr")

Changes to client/client.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2021-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2021-present Detlef Stern
//-----------------------------------------------------------------------------

// Package client provides a client for accessing the Zettelstore via its API.
package client

import (
	"bufio"
	"bytes"
	"context"
	"fmt"
	"encoding/json"
	"io"
	"net"
	"net/http"
	"net/url"
	"strconv"
	"strings"
	"time"

	"t73f.de/r/sx"
	"t73f.de/r/sx/sxreader"
	"t73f.de/r/zsc/api"
	"codeberg.org/t73fde/sxpf"
	"codeberg.org/t73fde/sxpf/reader"
	"zettelstore.de/c/api"
	"t73f.de/r/zsc/sexp"
	"t73f.de/r/zsc/sz"
)

// Client contains all data to execute requests.
type Client struct {
	base      string
	username  string
	password  string
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	myURL := *u
	myURL.User = nil
	myURL.ForceQuery = false
	myURL.RawQuery = ""
	myURL.Fragment = ""
	myURL.RawFragment = ""
	base := myURL.String()
	if !strings.HasSuffix(base, "/") {
		base += "/"
	}
	c := Client{
		base: base,
		client: http.Client{
			Timeout: 10 * time.Second,
			Transport: &http.Transport{
				DialContext: (&net.Dialer{
					Timeout: 5 * time.Second, // TCP connect timeout
				}).DialContext,
				TLSHandshakeTimeout: 5 * time.Second,
			},
		},
	}
	return &c
}

// AllowRedirect will modify the client to not follow redirect status code when
// using the Zettelstore. The original behaviour can be restored by settinh
// "allow" to false.
func (c *Client) AllowRedirect(allow bool) {
	if allow {
		c.client.CheckRedirect = func(req *http.Request, via []*http.Request) error {
			return http.ErrUseLastResponse
		}
	} else {
		c.client.CheckRedirect = nil
	}
}

// Error encapsulates the possible client call errors.
type Error struct {
	StatusCode int
	Message    string
	Body       []byte
}

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	return &Error{
		StatusCode: resp.StatusCode,
		Message:    resp.Status[4:],
		Body:       body,
	}
}

// NewURLBuilder creates a new URL builder for the client with the given key.
func (c *Client) NewURLBuilder(key byte) *api.URLBuilder {
func (c *Client) newURLBuilder(key byte) *api.URLBuilder {
	return api.NewURLBuilder(c.base, key)
}
func (*Client) newRequest(ctx context.Context, method string, ub *api.URLBuilder, body io.Reader) (*http.Request, error) {
	return http.NewRequestWithContext(ctx, method, ub.String(), body)
}

func (c *Client) executeRequest(req *http.Request) (*http.Response, error) {
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	if err != nil {
		return err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return statusToError(resp)
	}
	rd := sxreader.MakeReader(resp.Body)
	obj, err := rd.Read()
	if err != nil {
	dec := json.NewDecoder(resp.Body)
	var tinfo api.AuthJSON
	err = dec.Decode(&tinfo)
		return err
	}
	vals, err := sexp.ParseList(obj, "ssi")
	if err != nil {
		return err
	}
	token := vals[1].(sx.String).GetValue()
	if len(token) < 4 {
		return fmt.Errorf("no valid token found: %q", token)
	}
	c.token = token
	c.tokenType = vals[0].(sx.String).GetValue()
	c.expires = time.Now().Add(time.Duration(vals[2].(sx.Int64)*9/10) * time.Second)
	c.token = tinfo.Token
	c.tokenType = tinfo.Type
	c.expires = time.Now().Add(time.Duration(tinfo.Expires*10/9) * time.Second)
	return nil
}

func (c *Client) updateToken(ctx context.Context) error {
	if c.username == "" {
		return nil
	}
	if time.Now().After(c.expires) {
		return c.Authenticate(ctx)
	}
	return c.RefreshToken(ctx)
}

// Authenticate sets a new token by sending user name and password.
func (c *Client) Authenticate(ctx context.Context) error {
	authData := url.Values{"username": {c.username}, "password": {c.password}}
	req, err := c.newRequest(ctx, http.MethodPost, c.NewURLBuilder('a'), strings.NewReader(authData.Encode()))
	req, err := c.newRequest(ctx, http.MethodPost, c.newURLBuilder('a'), strings.NewReader(authData.Encode()))
	if err != nil {
		return err
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	return c.executeAuthRequest(req)
}

// RefreshToken updates the access token
func (c *Client) RefreshToken(ctx context.Context) error {
	req, err := c.newRequest(ctx, http.MethodPut, c.NewURLBuilder('a'), nil)
	req, err := c.newRequest(ctx, http.MethodPut, c.newURLBuilder('a'), nil)
	if err != nil {
		return err
	}
	return c.executeAuthRequest(req)
}

// CreateZettel creates a new zettel and returns its URL.
func (c *Client) CreateZettel(ctx context.Context, data []byte) (api.ZettelID, error) {
	ub := c.NewURLBuilder('z')
	ub := c.newURLBuilder('z')
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodPost, ub, bytes.NewBuffer(data), nil)
	if err != nil {
		return api.InvalidZID, err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusCreated {
		return api.InvalidZID, statusToError(resp)
	}
	b, err := io.ReadAll(resp.Body)
	if err != nil {
		return api.InvalidZID, err
	}
	if zid := api.ZettelID(b); zid.IsValid() {
		return zid, nil
	}
	return api.InvalidZID, err
}

// CreateZettelData creates a new zettel and returns its URL.
func (c *Client) CreateZettelData(ctx context.Context, data api.ZettelData) (api.ZettelID, error) {
// CreateZettelJSON creates a new zettel and returns its URL.
func (c *Client) CreateZettelJSON(ctx context.Context, data *api.ZettelDataJSON) (api.ZettelID, error) {
	var buf bytes.Buffer
	if _, err := sx.Print(&buf, sexp.EncodeZettel(data)); err != nil {
	if err := encodeZettelData(&buf, data); err != nil {
		return api.InvalidZID, err
	}
	ub := c.NewURLBuilder('z').AppendKVQuery(api.QueryKeyEncoding, api.EncodingData)
	ub := c.newURLBuilder('z').AppendKVQuery(api.QueryKeyEncoding, api.EncodingJson)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodPost, ub, &buf, nil)
	if err != nil {
		return api.InvalidZID, err
	}
	defer resp.Body.Close()
	rdr := sxreader.MakeReader(resp.Body)
	obj, err := rdr.Read()
	if resp.StatusCode != http.StatusCreated {
		return api.InvalidZID, statusToError(resp)
	}
	dec := json.NewDecoder(resp.Body)
	var newZid api.ZidJSON
	err = dec.Decode(&newZid)
	if err != nil {
		return api.InvalidZID, err
	}
	if zid := newZid.ID; zid.IsValid() {
	return makeZettelID(obj)
		return zid, nil
	}
	return api.InvalidZID, err
}

func encodeZettelData(buf *bytes.Buffer, data *api.ZettelDataJSON) error {
	enc := json.NewEncoder(buf)
	enc.SetEscapeHTML(false)
	return enc.Encode(&data)
}

var bsLF = []byte{'\n'}

// QueryZettel returns a list of all Zettel.
func (c *Client) QueryZettel(ctx context.Context, query string) ([][]byte, error) {
	ub := c.NewURLBuilder('z').AppendQuery(query)
// ListZettel returns a list of all Zettel.
func (c *Client) ListZettel(ctx context.Context, query string) ([][]byte, error) {
	ub := c.newURLBuilder('z').AppendQuery(query)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	data, err := io.ReadAll(resp.Body)
	switch resp.StatusCode {
	case http.StatusOK:
	case http.StatusNoContent:
		return nil, nil
	default:
		return nil, statusToError(resp)
	}
	data, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	lines := bytes.Split(data, bsLF)
	if len(lines[len(lines)-1]) == 0 {
		lines = lines[:len(lines)-1]
	}
	return lines, nil
}

// QueryZettelData returns a list of zettel metadata.
func (c *Client) QueryZettelData(ctx context.Context, query string) (string, string, []api.ZidMetaRights, error) {
	ub := c.NewURLBuilder('z').AppendKVQuery(api.QueryKeyEncoding, api.EncodingData).AppendQuery(query)
// ListZettelJSON returns a list of zettel.
func (c *Client) ListZettelJSON(ctx context.Context, query string) (string, string, []api.ZidMetaJSON, error) {
	ub := c.newURLBuilder('z').AppendKVQuery(api.QueryKeyEncoding, api.EncodingJson).AppendQuery(query)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return "", "", nil, err
	}
	defer resp.Body.Close()
	rdr := sxreader.MakeReader(resp.Body)
	obj, err := rdr.Read()
	switch resp.StatusCode {
	if resp.StatusCode != http.StatusOK {
	case http.StatusOK:
	case http.StatusNoContent:
		return "", "", nil, nil
	default:
		return "", "", nil, statusToError(resp)
	}
	if err != nil {
		return "", "", nil, err
	}
	vals, err := sexp.ParseList(obj, "yppp")
	if err != nil {
		return "", "", nil, err
	}
	qVals, err := sexp.ParseList(vals[1], "ys")
	if err != nil {
		return "", "", nil, err
	}
	hVals, err := sexp.ParseList(vals[2], "ys")
	if err != nil {
		return "", "", nil, err
	}
	metaList, err := parseMetaList(vals[3].(*sx.Pair))
	return sz.GoValue(qVals[1]), sz.GoValue(hVals[1]), metaList, err
}

	dec := json.NewDecoder(resp.Body)
func parseMetaList(metaPair *sx.Pair) ([]api.ZidMetaRights, error) {
	if metaPair == nil {
		return nil, fmt.Errorf("no zettel list")
	}
	if errSym := sexp.CheckSymbol(metaPair.Car(), "list"); errSym != nil {
		return nil, errSym
	}
	var result []api.ZidMetaRights
	for node := metaPair.Cdr(); !sx.IsNil(node); {
		elem, isPair := sx.GetPair(node)
		if !isPair {
			return nil, fmt.Errorf("meta-list not a proper list: %v", metaPair.String())
		}
		node = elem.Cdr()
		vals, err := sexp.ParseList(elem.Car(), "yppp")
		if err != nil {
			return nil, err
		}

		if errSym := sexp.CheckSymbol(vals[0], "zettel"); errSym != nil {
			return nil, errSym
		}

		idVals, err := sexp.ParseList(vals[1], "yi")
		if err != nil {
			return nil, err
		}
		if errSym := sexp.CheckSymbol(idVals[0], "id"); errSym != nil {
			return nil, errSym
		}
		zid, err := makeZettelID(idVals[1])
		if err != nil {
			return nil, err
		}

		meta, err := sexp.ParseMeta(vals[2].(*sx.Pair))
		if err != nil {
			return nil, err
		}

		rights, err := sexp.ParseRights(vals[3])
		if err != nil {
			return nil, err
		}

		result = append(result, api.ZidMetaRights{
			ID:     zid,
			Meta:   meta,
			Rights: rights,
		})
	}
	return result, nil
}
func makeZettelID(obj sx.Object) (api.ZettelID, error) {
	val, isInt64 := obj.(sx.Int64)
	if !isInt64 || val <= 0 {
		return api.InvalidZID, fmt.Errorf("invalid zettel ID: %v", val)
	}
	sVal := strconv.FormatInt(int64(val), 10)
	if len(sVal) < 14 {
		sVal = "00000000000000"[0:14-len(sVal)] + sVal
	}
	zid := api.ZettelID(sVal)
	var zl api.ZettelListJSON
	if !zid.IsValid() {
		return api.InvalidZID, fmt.Errorf("invalid zettel ID: %v", val)
	}
	return zid, nil
}

	err = dec.Decode(&zl)
// QueryAggregate returns a aggregate as a result of a query.
// It is most often used in a query with an action, where the action is either
// a metadata key of type Word or of type TagSet.
func (c *Client) QueryAggregate(ctx context.Context, query string) (api.Aggregate, error) {
	lines, err := c.QueryZettel(ctx, query)
	if err != nil {
		return nil, err
	}
	if len(lines) == 0 {
		return nil, nil
	}
	agg := make(api.Aggregate, len(lines))
	for _, line := range lines {
		if fields := bytes.Fields(line); len(fields) > 1 {
			key := string(fields[0])
			for _, field := range fields[1:] {
				if zid := api.ZettelID(string(field)); zid.IsValid() {
					agg[key] = append(agg[key], zid)
				}
			}
		}
	}
	return agg, nil
}

// TagZettel returns the tag zettel of a given tag.
//
// This method only works if c.AllowRedirect(true) was called.
func (c *Client) TagZettel(ctx context.Context, tag string) (api.ZettelID, error) {
	return c.fetchTagOrRoleZettel(ctx, api.QueryKeyTag, tag)
}

// RoleZettel returns the tag zettel of a given tag.
//
// This method only works if c.AllowRedirect(true) was called.
func (c *Client) RoleZettel(ctx context.Context, role string) (api.ZettelID, error) {
	return c.fetchTagOrRoleZettel(ctx, api.QueryKeyRole, role)
}

func (c *Client) fetchTagOrRoleZettel(ctx context.Context, key, val string) (api.ZettelID, error) {
	if c.client.CheckRedirect == nil {
		panic("client does not allow to track redirect")
	}
	ub := c.NewURLBuilder('z').AppendKVQuery(key, val)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return api.InvalidZID, err
	}
	defer resp.Body.Close()
	data, err := io.ReadAll(resp.Body)
	if err != nil {
		return api.InvalidZID, err
	}

	switch resp.StatusCode {
	case http.StatusNotFound:
		return "", nil
		return "", "", nil, err
	case http.StatusFound:
		zid := api.ZettelID(data)
		if zid.IsValid() {
			return zid, nil
		}
		return api.InvalidZID, nil
	}
	return zl.Query, zl.Human, zl.List, nil
	default:
		return api.InvalidZID, statusToError(resp)
	}
}

// GetZettel returns a zettel as a string.
func (c *Client) GetZettel(ctx context.Context, zid api.ZettelID, part string) ([]byte, error) {
	ub := c.NewURLBuilder('z').SetZid(zid)
	ub := c.newURLBuilder('z').SetZid(zid)
	if part != "" && part != api.PartContent {
		ub.AppendKVQuery(api.QueryKeyPart, part)
	}
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	data, err := io.ReadAll(resp.Body)
	switch resp.StatusCode {
	case http.StatusOK:
	case http.StatusNoContent:
		return nil, nil
	default:
		return nil, statusToError(resp)
	}
	return data, err
	return io.ReadAll(resp.Body)
}

// GetZettelData returns a zettel as a struct of its parts.
func (c *Client) GetZettelData(ctx context.Context, zid api.ZettelID) (api.ZettelData, error) {
	ub := c.NewURLBuilder('z').SetZid(zid)
	ub.AppendKVQuery(api.QueryKeyEncoding, api.EncodingData)
// GetZettelJSON returns a zettel as a JSON struct.
func (c *Client) GetZettelJSON(ctx context.Context, zid api.ZettelID) (*api.ZettelDataJSON, error) {
	ub := c.newURLBuilder('z').SetZid(zid)
	ub.AppendKVQuery(api.QueryKeyEncoding, api.EncodingJson)
	ub.AppendKVQuery(api.QueryKeyPart, api.PartZettel)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err == nil {
		defer resp.Body.Close()
		if resp.StatusCode != http.StatusOK {
			return api.ZettelData{}, statusToError(resp)
		}
		rdr := sxreader.MakeReader(resp.Body)
		obj, err2 := rdr.Read()
		if err2 == nil {
			return sexp.ParseZettel(obj)
		}
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return nil, statusToError(resp)
	}
	dec := json.NewDecoder(resp.Body)
	var out api.ZettelDataJSON
	err = dec.Decode(&out)
	if err != nil {
		return nil, err
	}
	}
	return api.ZettelData{}, err
	return &out, nil
}

// GetParsedZettel return a parsed zettel in a defined encoding.
func (c *Client) GetParsedZettel(ctx context.Context, zid api.ZettelID, enc api.EncodingEnum) ([]byte, error) {
	return c.getZettelString(ctx, zid, enc, true)
}

// GetEvaluatedZettel return an evaluated zettel in a defined encoding.
func (c *Client) GetEvaluatedZettel(ctx context.Context, zid api.ZettelID, enc api.EncodingEnum) ([]byte, error) {
	return c.getZettelString(ctx, zid, enc, false)
}

func (c *Client) getZettelString(ctx context.Context, zid api.ZettelID, enc api.EncodingEnum, parseOnly bool) ([]byte, error) {
	ub := c.NewURLBuilder('z').SetZid(zid)
	ub := c.newURLBuilder('z').SetZid(zid)
	ub.AppendKVQuery(api.QueryKeyEncoding, enc.String())
	ub.AppendKVQuery(api.QueryKeyPart, api.PartContent)
	if parseOnly {
		ub.AppendKVQuery(api.QueryKeyParseOnly, "")
	}
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	switch resp.StatusCode {
	case http.StatusOK:
	case http.StatusNoContent:
	default:
		return nil, statusToError(resp)
	}
	return io.ReadAll(resp.Body)
}

// GetParsedSz returns an parsed zettel as a Sexpr-decoded data structure.
func (c *Client) GetParsedSz(ctx context.Context, zid api.ZettelID, part string) (sx.Object, error) {
	return c.getSz(ctx, zid, part, true)
// GetParsedSexpr returns an parsed zettel as a Sexpr-decoded data structure.
func (c *Client) GetParsedSexpr(ctx context.Context, zid api.ZettelID, part string, sf sxpf.SymbolFactory) (sxpf.Object, error) {
	return c.getSexpr(ctx, zid, part, true, sf)
}

// GetEvaluatedSz returns an evaluated zettel as a Sexpr-decoded data structure.
func (c *Client) GetEvaluatedSz(ctx context.Context, zid api.ZettelID, part string) (sx.Object, error) {
	return c.getSz(ctx, zid, part, false)
// GetEvaluatedSexpr returns an evaluated zettel as a Sexpr-decoded data structure.
func (c *Client) GetEvaluatedSexpr(ctx context.Context, zid api.ZettelID, part string, sf sxpf.SymbolFactory) (sxpf.Object, error) {
	return c.getSexpr(ctx, zid, part, false, sf)
}

func (c *Client) getSz(ctx context.Context, zid api.ZettelID, part string, parseOnly bool) (sx.Object, error) {
	ub := c.NewURLBuilder('z').SetZid(zid)
	ub.AppendKVQuery(api.QueryKeyEncoding, api.EncodingSz)
func (c *Client) getSexpr(ctx context.Context, zid api.ZettelID, part string, parseOnly bool, sf sxpf.SymbolFactory) (sxpf.Object, error) {
	ub := c.newURLBuilder('z').SetZid(zid)
	ub.AppendKVQuery(api.QueryKeyEncoding, api.EncodingSexpr)
	if part != "" {
		ub.AppendKVQuery(api.QueryKeyPart, part)
	}
	if parseOnly {
		ub.AppendKVQuery(api.QueryKeyParseOnly, "")
	}
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return nil, statusToError(resp)
	}
	return sxreader.MakeReader(bufio.NewReaderSize(resp.Body, 8)).Read()
	return reader.MakeReader(bufio.NewReaderSize(resp.Body, 8), reader.WithSymbolFactory(sf)).Read()
}

// GetMetaData returns the metadata of a zettel.
func (c *Client) GetMetaData(ctx context.Context, zid api.ZettelID) (api.MetaRights, error) {
	ub := c.NewURLBuilder('z').SetZid(zid)
	ub.AppendKVQuery(api.QueryKeyEncoding, api.EncodingData)
// GetMeta returns the metadata of a zettel.
func (c *Client) GetMeta(ctx context.Context, zid api.ZettelID) (api.ZettelMeta, error) {
	ub := c.newURLBuilder('z').SetZid(zid)
	ub.AppendKVQuery(api.QueryKeyEncoding, api.EncodingJson)
	ub.AppendKVQuery(api.QueryKeyPart, api.PartMeta)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return api.MetaRights{}, err
		return nil, err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return nil, statusToError(resp)
	}
	dec := json.NewDecoder(resp.Body)
	var out api.MetaJSON
	err = dec.Decode(&out)
	if err != nil {
		return nil, err
	}
	return out.Meta, nil
}

// GetZettelOrder returns metadata of the given zettel and, more important,
// metadata of zettel that are referenced in a list within the first zettel.
func (c *Client) GetZettelOrder(ctx context.Context, zid api.ZettelID) (*api.ZidMetaRelatedList, error) {
	ub := c.newURLBuilder('o').SetZid(zid)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return nil, statusToError(resp)
	}
	dec := json.NewDecoder(resp.Body)
	var out api.ZidMetaRelatedList
	err = dec.Decode(&out)
	if err != nil {
		return nil, err
	}
	return &out, nil
}

// ContextDirection specifies how the context should be calculated.
type ContextDirection uint8

// Allowed values for ContextDirection
const (
	_ ContextDirection = iota
	DirBoth
	DirBackward
	DirForward
)

// GetZettelContext returns metadata of the given zettel and, more important,
// metadata of zettel that for the context of the first zettel.
func (c *Client) GetZettelContext(
	ctx context.Context, zid api.ZettelID, dir ContextDirection, cost, limit int) (
	*api.ZidMetaRelatedList, error,
) {
	ub := c.newURLBuilder('x').SetZid(zid)
	switch dir {
	case DirBackward:
		ub.AppendKVQuery(api.QueryKeyDir, api.DirBackward)
	case DirForward:
		ub.AppendKVQuery(api.QueryKeyDir, api.DirForward)
	}
	if cost > 0 {
		ub.AppendKVQuery(api.QueryKeyCost, strconv.Itoa(cost))
	}
	if limit > 0 {
		ub.AppendKVQuery(api.QueryKeyLimit, strconv.Itoa(limit))
	}
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	rdr := sxreader.MakeReader(resp.Body)
	obj, err := rdr.Read()
	if resp.StatusCode != http.StatusOK {
		return api.MetaRights{}, statusToError(resp)
		return nil, statusToError(resp)
	}
	dec := json.NewDecoder(resp.Body)
	var out api.ZidMetaRelatedList
	err = dec.Decode(&out)
	if err != nil {
		return api.MetaRights{}, err
		return nil, err
	}
	vals, err := sexp.ParseList(obj, "ypp")
	if err != nil {
		return api.MetaRights{}, err
	}
	return &out, nil
}
	if errSym := sexp.CheckSymbol(vals[0], "list"); errSym != nil {
		return api.MetaRights{}, err
	}

	meta, err := sexp.ParseMeta(vals[1].(*sx.Pair))

// GetUnlinkedReferences returns connections to other zettel, embedded material, externals URLs.
func (c *Client) GetUnlinkedReferences(
	ctx context.Context, zid api.ZettelID, query url.Values) (*api.ZidMetaRelatedList, error) {
	ub := c.newQueryURLBuilder('u', query).SetZid(zid)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return api.MetaRights{}, err
		return nil, err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return nil, statusToError(resp)

	rights, err := sexp.ParseRights(vals[2])
	}
	dec := json.NewDecoder(resp.Body)
	var out api.ZidMetaRelatedList
	err = dec.Decode(&out)
	if err != nil {
		return api.MetaRights{}, err
		return nil, err
	}

	return api.MetaRights{
		Meta:   meta,
		Rights: rights,
	}, nil
	return &out, nil
}

// UpdateZettel updates an existing zettel.
func (c *Client) UpdateZettel(ctx context.Context, zid api.ZettelID, data []byte) error {
	ub := c.NewURLBuilder('z').SetZid(zid)
	ub := c.newURLBuilder('z').SetZid(zid)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodPut, ub, bytes.NewBuffer(data), nil)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusNoContent {
		return statusToError(resp)
	}
	return nil
}

// UpdateZettelData updates an existing zettel.
func (c *Client) UpdateZettelData(ctx context.Context, zid api.ZettelID, data api.ZettelData) error {
// UpdateZettelJSON updates an existing zettel.
func (c *Client) UpdateZettelJSON(ctx context.Context, zid api.ZettelID, data *api.ZettelDataJSON) error {
	var buf bytes.Buffer
	if _, err := sx.Print(&buf, sexp.EncodeZettel(data)); err != nil {
	if err := encodeZettelData(&buf, data); err != nil {
		return err
	}
	ub := c.NewURLBuilder('z').SetZid(zid).AppendKVQuery(api.QueryKeyEncoding, api.EncodingData)
	ub := c.newURLBuilder('z').SetZid(zid).AppendKVQuery(api.QueryKeyEncoding, api.EncodingJson)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodPut, ub, &buf, nil)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusNoContent {
		return statusToError(resp)
	}
	return nil
}

// RenameZettel renames a zettel.
func (c *Client) RenameZettel(ctx context.Context, oldZid, newZid api.ZettelID) error {
	ub := c.newURLBuilder('z').SetZid(oldZid)
	h := http.Header{
		api.HeaderDestination: {c.newURLBuilder('z').SetZid(newZid).String()},
	}
	resp, err := c.buildAndExecuteRequest(ctx, api.MethodMove, ub, nil, h)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusNoContent {
		return statusToError(resp)
	}
	return nil
}

// DeleteZettel deletes a zettel with the given identifier.
func (c *Client) DeleteZettel(ctx context.Context, zid api.ZettelID) error {
	ub := c.NewURLBuilder('z').SetZid(zid)
	ub := c.newURLBuilder('z').SetZid(zid)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodDelete, ub, nil, nil)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusNoContent {
		return statusToError(resp)
	}
	return nil
}

// ExecuteCommand will execute a given command at the Zettelstore.
func (c *Client) ExecuteCommand(ctx context.Context, command api.Command) error {
	ub := c.NewURLBuilder('x').AppendKVQuery(api.QueryKeyCommand, string(command))
	ub := c.newURLBuilder('x').AppendKVQuery(api.QueryKeyCommand, string(command))
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodPost, ub, nil, nil)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusNoContent {
		return statusToError(resp)
	}
	return nil
}

func (c *Client) newQueryURLBuilder(key byte, query url.Values) *api.URLBuilder {
	ub := c.newURLBuilder(key)
	for key, values := range query {
		if key == api.QueryKeyEncoding {
			continue
		}
		for _, val := range values {
			ub.AppendKVQuery(key, val)
		}
	}
// GetVersionInfo returns version information.
func (c *Client) GetVersionInfo(ctx context.Context) (VersionInfo, error) {
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, c.NewURLBuilder('x'), nil, nil)
	return ub
}

// QueryMapMeta returns a map of all metadata values with the given query action to the
// list of zettel IDs containing this value.
func (c *Client) QueryMapMeta(ctx context.Context, query string) (api.MapMeta, error) {
	err := c.updateToken(ctx)
	if err != nil {
		return nil, err
	}
	req, err := c.newRequest(ctx, http.MethodGet, c.newURLBuilder('z').AppendKVQuery(api.QueryKeyEncoding, api.EncodingJson).AppendQuery(query), nil)
	if err != nil {
		return VersionInfo{}, err
		return nil, err
	}
	resp, err := c.executeRequest(req)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return VersionInfo{}, statusToError(resp)
		return nil, statusToError(resp)
	}
	rdr := sxreader.MakeReader(resp.Body)
	dec := json.NewDecoder(resp.Body)
	obj, err := rdr.Read()
	if err == nil {
		if vals, errVals := sexp.ParseList(obj, "iiiss"); errVals == nil {
			return VersionInfo{
				Major: int(vals[0].(sx.Int64)),
				Minor: int(vals[1].(sx.Int64)),
				Patch: int(vals[2].(sx.Int64)),
				Info:  vals[3].(sx.String).GetValue(),
				Hash:  vals[4].(sx.String).GetValue(),
			}, nil
		}
	}
	return VersionInfo{}, err
}

	var mlj api.MapListJSON
// VersionInfo contains version information.
type VersionInfo struct {
	Major int
	Minor int
	Patch int
	Info  string
	Hash  string
}

	err = dec.Decode(&mlj)
// GetApplicationZid returns the zettel identifier used to configure client
// application with the given name.
func (c *Client) GetApplicationZid(ctx context.Context, appname string) (api.ZettelID, error) {
	mr, err := c.GetMetaData(ctx, api.ZidAppDirectory)
	if err != nil {
		return api.InvalidZID, err
	}
	key := appname + "-zid"
	val, found := mr.Meta[key]
	if !found {
		return api.InvalidZID, fmt.Errorf("no application registered: %v", appname)
	}
	if zid := api.ZettelID(val); zid.IsValid() {
		return zid, nil
	}
	return api.InvalidZID, fmt.Errorf("invalid identifier for application %v: %v", appname, val)
}

// Get executes a GET request to the given URL and returns the read data.
func (c *Client) Get(ctx context.Context, ub *api.URLBuilder) ([]byte, error) {
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return nil, err
	}
	return mlj.Map, nil
}

// GetVersionJSON returns version information..
func (c *Client) GetVersionJSON(ctx context.Context) (api.VersionJSON, error) {
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, c.newURLBuilder('x'), nil, nil)
	if err != nil {
		return api.VersionJSON{}, err
	}
	defer resp.Body.Close()
	switch resp.StatusCode {
	if resp.StatusCode != http.StatusOK {
	case http.StatusOK:
	case http.StatusNoContent:
		return nil, nil
	default:
		return nil, statusToError(resp)
		return api.VersionJSON{}, statusToError(resp)
	}
	data, err := io.ReadAll(resp.Body)
	return data, err
	dec := json.NewDecoder(resp.Body)
	var version api.VersionJSON
	err = dec.Decode(&version)
	if err != nil {
		return api.VersionJSON{}, err
	}
	return version, nil
}

Changes to client/client_test.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2022-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2022-present Detlef Stern
//-----------------------------------------------------------------------------

package client_test

import (
	"context"
	"flag"
	"net/http"
	"net/url"
	"testing"

	"codeberg.org/t73fde/sxpf"
	"t73f.de/r/zsc/api"
	"t73f.de/r/zsc/client"
	"zettelstore.de/c/api"
	"zettelstore.de/c/client"
	"zettelstore.de/c/sexpr"
)

func TestZettelList(t *testing.T) {
	c := getClient()
	_, err := c.QueryZettel(context.Background(), "")
	_, err := c.ListZettel(context.Background(), "")
	if err != nil {
		t.Error(err)
		return
	}
}

func TestGetProtectedZettel(t *testing.T) {
	c := getClient()
	_, err := c.GetZettel(context.Background(), api.ZidStartupConfiguration, api.PartZettel)
	if err != nil {
		if cErr, ok := err.(*client.Error); ok && cErr.StatusCode == http.StatusForbidden {
			return
		} else {
			t.Error(err)
		}
		return
	}
}

func TestGetSzZettel(t *testing.T) {
func TestGetSexprZettel(t *testing.T) {
	c := getClient()
	sf := sxpf.MakeMappedFactory()
	var zetSyms sexpr.ZettelSymbols
	zetSyms.InitializeZettelSymbols(sf)
	value, err := c.GetEvaluatedSz(context.Background(), api.ZidDefaultHome, api.PartContent)
	value, err := c.GetEvaluatedSexpr(context.Background(), api.ZidDefaultHome, api.PartContent, sf)
	if err != nil {
		t.Error(err)
		return
	}
	if value.IsNil() {
		t.Error("No data")
	}

Changes to go.mod.

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module t73f.de/r/zsc
module zettelstore.de/c

go 1.22
go 1.20

require (
	t73f.de/r/sx v0.0.0-20240513163553-ec4fcc6539ca
	codeberg.org/t73fde/sxhtml v0.0.0-20230317170051-24321195e197
	t73f.de/r/sxwebs v0.0.0-20240613142113-66fc5a284245
	t73f.de/r/webs v0.0.0-20240617100047-8730e9917915
	codeberg.org/t73fde/sxpf v0.0.0-20230319111333-7de220f3b475
)

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t73f.de/r/sx v0.0.0-20240513163553-ec4fcc6539ca h1:vvDqiuUfBLf+t/gpiSyqIFAdvZ7FLigOH38bqMY+v8k=
t73f.de/r/sx v0.0.0-20240513163553-ec4fcc6539ca/go.mod h1:G9pD1j2R6y9ZkPBb81mSnmwaAvTOg7r6jKp/OF7WeFA=
t73f.de/r/sxwebs v0.0.0-20240613142113-66fc5a284245 h1:raE7KUgoGsp2DzXOko9dDXEsSJ/VvoXCDYeICx7i6uo=
t73f.de/r/sxwebs v0.0.0-20240613142113-66fc5a284245/go.mod h1:ErPBVUyE2fOktL/8M7lp/PR93wP/o9RawMajB1uSqj8=
codeberg.org/t73fde/sxhtml v0.0.0-20230317170051-24321195e197 h1:6kX7TY25agLFlHNvByO1Jc3GrBA7mu7aOa8tCOniUew=
codeberg.org/t73fde/sxhtml v0.0.0-20230317170051-24321195e197/go.mod h1:Dp3EwBSsE3TvdPw9QZ4Wm25ZragluVT2OayRFRiq6jk=
codeberg.org/t73fde/sxpf v0.0.0-20230319111333-7de220f3b475 h1:0OTzV3FYY/Y7YsaVaSzF4Wd17pXzdH6DaSvMeqteJc4=
codeberg.org/t73fde/sxpf v0.0.0-20230319111333-7de220f3b475/go.mod h1:iSbMygOmtRQYp8pryNKYzRuMibYDSR80smU2b6qm1bc=
t73f.de/r/webs v0.0.0-20240617100047-8730e9917915 h1:rwUaPBIH3shrUIkmw51f4RyCplsCU+ISZHailsLiHTE=
t73f.de/r/webs v0.0.0-20240617100047-8730e9917915/go.mod h1:UGAAtul0TK5ACeZ6zTS3SX6GqwMFXxlUpHiV8oqNq5w=

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//-----------------------------------------------------------------------------
// Copyright (c) 2022-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2022-present Detlef Stern
//-----------------------------------------------------------------------------

package input

import (
	"html"
	"unicode"
)

// ScanEntity scans either a named or a numbered entity and returns it as a string.
//
// For numbered entities (like &#123; or &#x123;) html.UnescapeString returns
// sometimes other values as expected, if the number is not well-formed. This
// may happen because of some strange HTML parsing rules. But these do not
// apply to Zettelmarkup. Therefore, I parse the number here in the code.
func (inp *Input) ScanEntity() (res string, success bool) {
	if inp.Ch != '&' {
		return "", false
	}
	pos := inp.Pos
	inp.Next()
	if inp.Ch == '#' {
		inp.Next()
		if inp.Ch == 'x' || inp.Ch == 'X' {
			return inp.scanEntityBase16()
		}
		return inp.scanEntityBase10()
	}
	return inp.scanEntityNamed(pos)
}

func (inp *Input) scanEntityBase16() (string, bool) {
	inp.Next()
	if inp.Ch == ';' {
		return "", false
	}
	code := 0
	for {
		switch ch := inp.Ch; ch {
		case ';':
			inp.Next()
			if r := rune(code); isValidEntity(r) {
				return string(r), true
			}
			return "", false
		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
			code = 16*code + int(ch-'0')
		case 'a', 'b', 'c', 'd', 'e', 'f':
			code = 16*code + int(ch-'a'+10)
		case 'A', 'B', 'C', 'D', 'E', 'F':
			code = 16*code + int(ch-'A'+10)
		default:
			return "", false
		}
		if code > unicode.MaxRune {
			return "", false
		}
		inp.Next()
	}
}

func (inp *Input) scanEntityBase10() (string, bool) {
	// Base 10 code
	if inp.Ch == ';' {
		return "", false
	}
	code := 0
	for {
		switch ch := inp.Ch; ch {
		case ';':
			inp.Next()
			if r := rune(code); isValidEntity(r) {
				return string(r), true
			}
			return "", false
		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
			code = 10*code + int(ch-'0')
		default:
			return "", false
		}
		if code > unicode.MaxRune {
			return "", false
		}
		inp.Next()
	}
}
func (inp *Input) scanEntityNamed(pos int) (string, bool) {
	for {
		switch inp.Ch {
		case EOS, '\n', '\r', '&':
			return "", false
		case ';':
			inp.Next()
			es := string(inp.Src[pos:inp.Pos])
			ues := html.UnescapeString(es)
			if es == ues {
				return "", false
			}
			return ues, true
		default:
			inp.Next()
		}
	}
}

// isValidEntity checks if the given code is valid for an entity.
//
// According to https://html.spec.whatwg.org/multipage/syntax.html#character-references
// ""The numeric character reference forms described above are allowed to reference any code point
// excluding U+000D CR, noncharacters, and controls other than ASCII whitespace.""
func isValidEntity(r rune) bool {
	// No C0 control and no "code point in the range U+007F DELETE to U+009F APPLICATION PROGRAM COMMAND, inclusive."
	if r < ' ' || ('\u007f' <= r && r <= '\u009f') {
		return false
	}

	// If below any noncharacter code point, return true
	//
	// See: https://infra.spec.whatwg.org/#noncharacter
	if r < '\ufdd0' {
		return true
	}

	// First range of noncharacter code points: "(...) in the range U+FDD0 to U+FDEF, inclusive"
	if r <= '\ufdef' {
		return false
	}

	// Other noncharacter code points:
	switch r {
	case '\uFFFE', '\uFFFF',
		'\U0001FFFE', '\U0001FFFF',
		'\U0002FFFE', '\U0002FFFF',
		'\U0003FFFE', '\U0003FFFF',
		'\U0004FFFE', '\U0004FFFF',
		'\U0005FFFE', '\U0005FFFF',
		'\U0006FFFE', '\U0006FFFF',
		'\U0007FFFE', '\U0007FFFF',
		'\U0008FFFE', '\U0008FFFF',
		'\U0009FFFE', '\U0009FFFF',
		'\U000AFFFE', '\U000AFFFF',
		'\U000BFFFE', '\U000BFFFF',
		'\U000CFFFE', '\U000CFFFF',
		'\U000DFFFE', '\U000DFFFF',
		'\U000EFFFE', '\U000EFFFF',
		'\U000FFFFE', '\U000FFFFF',
		'\U0010FFFE', '\U0010FFFF':
		return false
	}
	return true
}

Deleted input/entity_test.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
//-----------------------------------------------------------------------------

package input_test

import (
	"testing"

	"t73f.de/r/zsc/input"
)

func TestScanEntity(t *testing.T) {
	t.Parallel()
	var testcases = []struct {
		text string
		exp  string
	}{
		{"", ""},
		{"a", ""},
		{"&amp;", "&"},
		{"&#33;", "!"},
		{"&#x33;", "3"},
		{"&quot;", "\""},
	}
	for id, tc := range testcases {
		inp := input.NewInput([]byte(tc.text))
		got, ok := inp.ScanEntity()
		if !ok {
			if tc.exp != "" {
				t.Errorf("ID=%d, text=%q: expected error, but got %q", id, tc.text, got)
			}
			if inp.Pos != 0 {
				t.Errorf("ID=%d, text=%q: input position advances to %d", id, tc.text, inp.Pos)
			}
			continue
		}
		if tc.exp != got {
			t.Errorf("ID=%d, text=%q: expected %q, but got %q", id, tc.text, tc.exp, got)
		}
	}
}

func TestScanIllegalEntity(t *testing.T) {
	t.Parallel()
	testcases := []string{"", "a", "& Input &rarr;", "&#9;", "&#x1f;"}
	for i, tc := range testcases {
		inp := input.NewInput([]byte(tc))
		got, ok := inp.ScanEntity()
		if ok {
			t.Errorf("%d: scanning %q was unexpected successful, got %q", i, tc, got)
			continue
		}
	}
}

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//-----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
//-----------------------------------------------------------------------------

// Package input provides an abstraction for data to be read.
package input

import "unicode/utf8"

// Input is an abstract input source
type Input struct {
	// Read-only, will never change
	Src []byte // The source string

	// Read-only, will change
	Ch      rune // current character
	Pos     int  // character position in src
	readPos int  // reading position (position after current character)
}

// NewInput creates a new input source.
func NewInput(src []byte) *Input {
	inp := &Input{Src: src}
	inp.Next()
	return inp
}

// EOS = End of source
const EOS = rune(-1)

// Next reads the next rune into inp.Ch and returns it too.
func (inp *Input) Next() rune {
	if inp.readPos >= len(inp.Src) {
		inp.Pos = len(inp.Src)
		inp.Ch = EOS
		return EOS
	}
	inp.Pos = inp.readPos
	r, w := rune(inp.Src[inp.readPos]), 1
	if r >= utf8.RuneSelf {
		r, w = utf8.DecodeRune(inp.Src[inp.readPos:])
	}
	inp.readPos += w
	inp.Ch = r
	return r
}

// Peek returns the rune following the most recently read rune without
// advancing. If end-of-source was already found peek returns EOS.
func (inp *Input) Peek() rune {
	return inp.PeekN(0)
}

// PeekN returns the n-th rune after the most recently read rune without
// advancing. If end-of-source was already found peek returns EOS.
func (inp *Input) PeekN(n int) rune {
	pos := inp.readPos + n
	if pos < len(inp.Src) {
		r := rune(inp.Src[pos])
		if r >= utf8.RuneSelf {
			r, _ = utf8.DecodeRune(inp.Src[pos:])
		}
		if r == '\t' {
			return ' '
		}
		return r
	}
	return EOS
}

// Accept checks if the given string is a prefix of the text to be parsed.
// If successful, advance position and current character.
// String must only contain bytes < 128.
// If not successful, everything remains as it is.
func (inp *Input) Accept(s string) bool {
	pos := inp.Pos
	remaining := len(inp.Src) - pos
	if s == "" || len(s) > remaining {
		return false
	}
	// According to internal documentation of bytes.Equal, the string() will not allocate any memory.
	if readPos := pos + len(s); s == string(inp.Src[pos:readPos]) {
		inp.readPos = readPos
		inp.Next()
		return true
	}
	return false
}

// IsEOLEOS returns true if char is either EOS or EOL.
func IsEOLEOS(ch rune) bool {
	switch ch {
	case EOS, '\n', '\r':
		return true
	}
	return false
}

// EatEOL transforms both "\r" and "\r\n" into "\n".
func (inp *Input) EatEOL() {
	switch inp.Ch {
	case '\r':
		if inp.Peek() == '\n' {
			inp.Next()
		}
		inp.Ch = '\n'
		inp.Next()
	case '\n':
		inp.Next()
	}
}

// SetPos allows to reset the read position.
func (inp *Input) SetPos(pos int) {
	if inp.Pos != pos {
		inp.readPos = pos
		inp.Next()
	}
}

// SkipToEOL reads until the next end-of-line.
func (inp *Input) SkipToEOL() {
	for {
		switch inp.Ch {
		case EOS, '\n', '\r':
			return
		}
		inp.Next()
	}
}

// ScanLineContent reads the reaining input stream and interprets it as lines of text.
func (inp *Input) ScanLineContent() []byte {
	result := make([]byte, 0, len(inp.Src)-inp.Pos+1)
	for {
		inp.EatEOL()
		posL := inp.Pos
		if inp.Ch == EOS {
			return result
		}
		inp.SkipToEOL()
		if len(result) > 0 {
			result = append(result, '\n')
		}
		result = append(result, inp.Src[posL:inp.Pos]...)
	}
}

Deleted input/input_test.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
//-----------------------------------------------------------------------------

// Package input_test provides some unit-tests for reading data.
package input_test

import (
	"testing"

	"t73f.de/r/zsc/input"
)

func TestEatEOL(t *testing.T) {
	t.Parallel()
	inp := input.NewInput(nil)
	inp.EatEOL()
	if inp.Ch != input.EOS {
		t.Errorf("No EOS found: %q", inp.Ch)
	}
	if inp.Pos != 0 {
		t.Errorf("Pos != 0: %d", inp.Pos)
	}

	inp = input.NewInput([]byte("ABC"))
	if inp.Ch != 'A' {
		t.Errorf("First ch != 'A', got %q", inp.Ch)
	}
	inp.EatEOL()
	if inp.Ch != 'A' {
		t.Errorf("First ch != 'A', got %q", inp.Ch)
	}
}

func TestAccept(t *testing.T) {
	t.Parallel()
	testcases := []struct {
		accept string
		src    string
		acc    bool
		exp    rune
	}{
		{"", "", false, input.EOS},
		{"AB", "abc", false, 'a'},
		{"AB", "ABC", true, 'C'},
		{"AB", "AB", true, input.EOS},
		{"AB", "A", false, 'A'},
	}
	for i, tc := range testcases {
		inp := input.NewInput([]byte(tc.src))
		acc := inp.Accept(tc.accept)
		if acc != tc.acc {
			t.Errorf("%d: %q.Accept(%q) == %v, but got %v", i, tc.src, tc.accept, tc.acc, acc)
		}
		if got := inp.Ch; tc.exp != got {
			t.Errorf("%d: %q.Accept(%q) should result in run %v, but got %v", i, tc.src, tc.accept, tc.exp, got)
		}
	}
}

Deleted input/runes.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
//-----------------------------------------------------------------------------

package input

import "unicode"

// IsSpace returns true if rune is a whitespace.
func IsSpace(ch rune) bool {
	switch ch {
	case ' ', '\t':
		return true
	case '\n', '\r', EOS:
		return false
	}
	return unicode.IsSpace(ch)
}

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//-----------------------------------------------------------------------------
// Copyright (c) 2022-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2022-present Detlef Stern
//-----------------------------------------------------------------------------

package maps

import "sort"

func Keys[T any](m map[string]T) []string {

Changes to maps/maps_test.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2022-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2022-present Detlef Stern
//-----------------------------------------------------------------------------

package maps_test

import (
	"testing"

	"t73f.de/r/zsc/maps"
	"zettelstore.de/c/maps"
)

func isSorted(seq []string) bool {
	for i := 1; i < len(seq); i++ {
		if seq[i] < seq[i-1] {
			return false
		}

Deleted sexp/sexp.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2023-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2023-present Detlef Stern
//-----------------------------------------------------------------------------

// Package sexp contains helper function to work with s-expression in an alien
// environment.
package sexp

import (
	"errors"
	"fmt"
	"sort"

	"t73f.de/r/sx"
	"t73f.de/r/zsc/api"
)

// EncodeZettel transforms zettel data into a sx object.
func EncodeZettel(zettel api.ZettelData) sx.Object {
	return sx.MakeList(
		sx.MakeSymbol("zettel"),
		meta2sz(zettel.Meta),
		sx.MakeList(sx.MakeSymbol("rights"), sx.Int64(int64(zettel.Rights))),
		sx.MakeList(sx.MakeSymbol("encoding"), sx.MakeString(zettel.Encoding)),
		sx.MakeList(sx.MakeSymbol("content"), sx.MakeString(zettel.Content)),
	)
}

func ParseZettel(obj sx.Object) (api.ZettelData, error) {
	vals, err := ParseList(obj, "ypppp")
	if err != nil {
		return api.ZettelData{}, err
	}
	if errSym := CheckSymbol(vals[0], "zettel"); errSym != nil {
		return api.ZettelData{}, errSym
	}

	meta, err := ParseMeta(vals[1].(*sx.Pair))
	if err != nil {
		return api.ZettelData{}, err
	}

	rights, err := ParseRights(vals[2])
	if err != nil {
		return api.ZettelData{}, err
	}

	encVals, err := ParseList(vals[3], "ys")
	if err != nil {
		return api.ZettelData{}, err
	}
	if errSym := CheckSymbol(encVals[0], "encoding"); errSym != nil {
		return api.ZettelData{}, errSym
	}

	contentVals, err := ParseList(vals[4], "ys")
	if err != nil {
		return api.ZettelData{}, err
	}
	if errSym := CheckSymbol(contentVals[0], "content"); errSym != nil {
		return api.ZettelData{}, errSym
	}

	return api.ZettelData{
		Meta:     meta,
		Rights:   rights,
		Encoding: encVals[1].(sx.String).GetValue(),
		Content:  contentVals[1].(sx.String).GetValue(),
	}, nil
}

// EncodeMetaRights translates metadata/rights into a sx object.
func EncodeMetaRights(mr api.MetaRights) *sx.Pair {
	return sx.MakeList(
		sx.SymbolList,
		meta2sz(mr.Meta),
		sx.MakeList(sx.MakeSymbol("rights"), sx.Int64(int64(mr.Rights))),
	)
}

func meta2sz(m api.ZettelMeta) sx.Object {
	var result sx.ListBuilder
	result.Add(sx.MakeSymbol("meta"))
	keys := make([]string, 0, len(m))
	for k := range m {
		keys = append(keys, k)
	}
	sort.Strings(keys)
	for _, k := range keys {
		val := sx.MakeList(sx.MakeSymbol(k), sx.MakeString(m[k]))
		result.Add(val)
	}
	return result.List()
}

// ParseMeta translates the given list to metadata.
func ParseMeta(pair *sx.Pair) (api.ZettelMeta, error) {
	if err := CheckSymbol(pair.Car(), "meta"); err != nil {
		return nil, err
	}
	res := api.ZettelMeta{}
	for node := pair.Tail(); node != nil; node = node.Tail() {
		mVals, err := ParseList(node.Car(), "ys")
		if err != nil {
			return nil, err
		}
		res[(mVals[0].(*sx.Symbol)).GetValue()] = mVals[1].(sx.String).GetValue()
	}
	return res, nil
}

// ParseRights returns the rights values of the given object.
func ParseRights(obj sx.Object) (api.ZettelRights, error) {
	rVals, err := ParseList(obj, "yi")
	if err != nil {
		return api.ZettelMaxRight, err
	}
	if errSym := CheckSymbol(rVals[0], "rights"); errSym != nil {
		return api.ZettelMaxRight, errSym
	}
	i64 := int64(rVals[1].(sx.Int64))
	if i64 < 0 && i64 >= int64(api.ZettelMaxRight) {
		return api.ZettelMaxRight, fmt.Errorf("invalid zettel right value: %v", i64)
	}
	return api.ZettelRights(i64), nil
}

// ParseList parses the given object as a proper list, based on a type specification.
func ParseList(obj sx.Object, spec string) (sx.Vector, error) {
	pair, isPair := sx.GetPair(obj)
	if !isPair {
		return nil, fmt.Errorf("not a list: %T/%v", obj, obj)
	}
	if pair == nil {
		if spec == "" {
			return nil, nil
		}
		return nil, ErrElementsMissing
	}

	result := make(sx.Vector, 0, len(spec))
	node, i := pair, 0
	for ; node != nil; i++ {
		if i >= len(spec) {
			return nil, ErrNoSpec
		}
		var val sx.Object
		var ok bool
		car := node.Car()
		switch spec[i] {
		case 'b':
			val, ok = sx.MakeBoolean(!sx.IsNil(car)), true
		case 'i':
			val, ok = car.(sx.Int64)
		case 'o':
			val, ok = car, true
		case 'p':
			val, ok = sx.GetPair(car)
		case 's':
			val, ok = sx.GetString(car)
		case 'y':
			val, ok = sx.GetSymbol(car)
		default:
			return nil, fmt.Errorf("unknown spec '%c'", spec[i])
		}
		if !ok {
			return nil, fmt.Errorf("does not match spec '%v': %v", spec[i], car)
		}
		result = append(result, val)
		next, isNextPair := sx.GetPair(node.Cdr())
		if !isNextPair {
			return nil, sx.ErrImproper{Pair: pair}
		}
		node = next
	}
	if i < len(spec) {
		return nil, ErrElementsMissing
	}
	return result, nil
}

var ErrElementsMissing = errors.New("spec contains more data")
var ErrNoSpec = errors.New("no spec for elements")

// CheckSymbol ensures that the given object is a symbol with the given name.
func CheckSymbol(obj sx.Object, name string) error {
	sym, isSymbol := sx.GetSymbol(obj)
	if !isSymbol {
		return fmt.Errorf("object %v/%T is not a symbol", obj, obj)
	}
	if got := sym.GetValue(); got != name {
		return fmt.Errorf("symbol %q expected, but got: %q", name, got)
	}
	return nil
}

Deleted sexp/sexp_test.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2023-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2023-present Detlef Stern
//-----------------------------------------------------------------------------

package sexp_test

import (
	"testing"

	"t73f.de/r/sx"
	"t73f.de/r/zsc/sexp"
)

func TestParseObject(t *testing.T) {
	if elems, err := sexp.ParseList(sx.MakeString("a"), "s"); err == nil {
		t.Error("expected an error, but got: ", elems)
	}
	if elems, err := sexp.ParseList(sx.Nil(), ""); err != nil {
		t.Error(err)
	} else if len(elems) != 0 {
		t.Error("Must be empty, but got:", elems)
	}
	if elems, err := sexp.ParseList(sx.Nil(), "b"); err == nil {
		t.Error("expected error, but got: ", elems)
	}

	if elems, err := sexp.ParseList(sx.MakeList(sx.MakeString("a")), "ss"); err == nil {
		t.Error("expected error, but got: ", elems)
	}
	if elems, err := sexp.ParseList(sx.MakeList(sx.MakeString("a")), ""); err == nil {
		t.Error("expected error, but got: ", elems)
	}
	if _, err := sexp.ParseList(sx.MakeList(sx.MakeString("a")), "b"); err != nil {
		t.Error("expected [1], but got error: ", err)
	}
	if elems, err := sexp.ParseList(sx.Cons(sx.Nil(), sx.MakeString("a")), "ps"); err == nil {
		t.Error("expected error, but got: ", elems)
	}

	if elems, err := sexp.ParseList(sx.MakeList(sx.MakeString("a")), "s"); err != nil {
		t.Error(err)
	} else if len(elems) != 1 {
		t.Error("length == 1, but got: ", elems)
	} else {
		_ = elems[0].(sx.String)
	}

}

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//-----------------------------------------------------------------------------
// Copyright (c) 2022-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//-----------------------------------------------------------------------------

package sexpr

import "codeberg.org/t73fde/sxpf"

// Various constants for Zettel data. Some of them are technically variables.

const (
	// Symbols for Metanodes
	NameSymBlock  = "BLOCK"
	NameSymInline = "INLINE"
	NameSymList   = "LIST"
	NameSymMeta   = "META"
	NameSymQuote  = "quote"

	// Symbols for Zettel node types.
	NameSymBLOB            = "BLOB"
	NameSymCell            = "CELL"
	NameSymCellCenter      = "CELL-CENTER"
	NameSymCellLeft        = "CELL-LEFT"
	NameSymCellRight       = "CELL-RIGHT"
	NameSymCite            = "CITE"
	NameSymDescription     = "DESCRIPTION"
	NameSymEmbed           = "EMBED"
	NameSymEmbedBLOB       = "EMBED-BLOB"
	NameSymEndnote         = "ENDNOTE"
	NameSymFormatEmph      = "FORMAT-EMPH"
	NameSymFormatDelete    = "FORMAT-DELETE"
	NameSymFormatInsert    = "FORMAT-INSERT"
	NameSymFormatQuote     = "FORMAT-QUOTE"
	NameSymFormatSpan      = "FORMAT-SPAN"
	NameSymFormatSub       = "FORMAT-SUB"
	NameSymFormatSuper     = "FORMAT-SUPER"
	NameSymFormatStrong    = "FORMAT-STRONG"
	NameSymHard            = "HARD"
	NameSymHeading         = "HEADING"
	NameSymLinkInvalid     = "LINK-INVALID"
	NameSymLinkZettel      = "LINK-ZETTEL"
	NameSymLinkSelf        = "LINK-SELF"
	NameSymLinkFound       = "LINK-FOUND"
	NameSymLinkBroken      = "LINK-BROKEN"
	NameSymLinkHosted      = "LINK-HOSTED"
	NameSymLinkBased       = "LINK-BASED"
	NameSymLinkQuery       = "LINK-QUERY"
	NameSymLinkExternal    = "LINK-EXTERNAL"
	NameSymListOrdered     = "ORDERED"
	NameSymListUnordered   = "UNORDERED"
	NameSymListQuote       = "QUOTATION"
	NameSymLiteralProg     = "LITERAL-CODE"
	NameSymLiteralComment  = "LITERAL-COMMENT"
	NameSymLiteralHTML     = "LITERAL-HTML"
	NameSymLiteralInput    = "LITERAL-INPUT"
	NameSymLiteralMath     = "LITERAL-MATH"
	NameSymLiteralOutput   = "LITERAL-OUTPUT"
	NameSymLiteralZettel   = "LITERAL-ZETTEL"
	NameSymMark            = "MARK"
	NameSymPara            = "PARA"
	NameSymRegionBlock     = "REGION-BLOCK"
	NameSymRegionQuote     = "REGION-QUOTE"
	NameSymRegionVerse     = "REGION-VERSE"
	NameSymSoft            = "SOFT"
	NameSymSpace           = "SPACE"
	NameSymTable           = "TABLE"
	NameSymText            = "TEXT"
	NameSymThematic        = "THEMATIC"
	NameSymTransclude      = "TRANSCLUDE"
	NameSymUnknown         = "UNKNOWN-NODE"
	NameSymVerbatimComment = "VERBATIM-COMMENT"
	NameSymVerbatimEval    = "VERBATIM-EVAL"
	NameSymVerbatimHTML    = "VERBATIM-HTML"
	NameSymVerbatimMath    = "VERBATIM-MATH"
	NameSymVerbatimProg    = "VERBATIM-CODE"
	NameSymVerbatimZettel  = "VERBATIM-ZETTEL"

	// Constant symbols for reference states.
	NameSymRefStateInvalid  = "INVALID"
	NameSymRefStateZettel   = "ZETTEL"
	NameSymRefStateSelf     = "SELF"
	NameSymRefStateFound    = "FOUND"
	NameSymRefStateBroken   = "BROKEN"
	NameSymRefStateHosted   = "HOSTED"
	NameSymRefStateBased    = "BASED"
	NameSymRefStateQuery    = "QUERY"
	NameSymRefStateExternal = "EXTERNAL"

	// Symbols for metadata types.
	NameSymTypeCredential   = "CREDENTIAL"
	NameSymTypeEmpty        = "EMPTY-STRING"
	NameSymTypeID           = "ZID"
	NameSymTypeIDSet        = "ZID-SET"
	NameSymTypeNumber       = "NUMBER"
	NameSymTypeString       = "STRING"
	NameSymTypeTagSet       = "TAG-SET"
	NameSymTypeTimestamp    = "TIMESTAMP"
	NameSymTypeURL          = "URL"
	NameSymTypeWord         = "WORD"
	NameSymTypeWordSet      = "WORD-SET"
	NameSymTypeZettelmarkup = "ZETTELMARKUP"
)

// ZettelSymbols collect all symbols needed to represent zettel data.
type ZettelSymbols struct {
	// Symbols for Metanodes
	SymBlock  *sxpf.Symbol
	SymInline *sxpf.Symbol
	SymList   *sxpf.Symbol
	SymMeta   *sxpf.Symbol
	SymQuote  *sxpf.Symbol

	// Symbols for Zettel node types.
	SymBLOB            *sxpf.Symbol
	SymCell            *sxpf.Symbol
	SymCellCenter      *sxpf.Symbol
	SymCellLeft        *sxpf.Symbol
	SymCellRight       *sxpf.Symbol
	SymCite            *sxpf.Symbol
	SymDescription     *sxpf.Symbol
	SymEmbed           *sxpf.Symbol
	SymEmbedBLOB       *sxpf.Symbol
	SymEndnote         *sxpf.Symbol
	SymFormatEmph      *sxpf.Symbol
	SymFormatDelete    *sxpf.Symbol
	SymFormatInsert    *sxpf.Symbol
	SymFormatQuote     *sxpf.Symbol
	SymFormatSpan      *sxpf.Symbol
	SymFormatSub       *sxpf.Symbol
	SymFormatSuper     *sxpf.Symbol
	SymFormatStrong    *sxpf.Symbol
	SymHard            *sxpf.Symbol
	SymHeading         *sxpf.Symbol
	SymLinkInvalid     *sxpf.Symbol
	SymLinkZettel      *sxpf.Symbol
	SymLinkSelf        *sxpf.Symbol
	SymLinkFound       *sxpf.Symbol
	SymLinkBroken      *sxpf.Symbol
	SymLinkHosted      *sxpf.Symbol
	SymLinkBased       *sxpf.Symbol
	SymLinkQuery       *sxpf.Symbol
	SymLinkExternal    *sxpf.Symbol
	SymListOrdered     *sxpf.Symbol
	SymListUnordered   *sxpf.Symbol
	SymListQuote       *sxpf.Symbol
	SymLiteralProg     *sxpf.Symbol
	SymLiteralComment  *sxpf.Symbol
	SymLiteralHTML     *sxpf.Symbol
	SymLiteralInput    *sxpf.Symbol
	SymLiteralMath     *sxpf.Symbol
	SymLiteralOutput   *sxpf.Symbol
	SymLiteralZettel   *sxpf.Symbol
	SymMark            *sxpf.Symbol
	SymPara            *sxpf.Symbol
	SymRegionBlock     *sxpf.Symbol
	SymRegionQuote     *sxpf.Symbol
	SymRegionVerse     *sxpf.Symbol
	SymSoft            *sxpf.Symbol
	SymSpace           *sxpf.Symbol
	SymTable           *sxpf.Symbol
	SymText            *sxpf.Symbol
	SymThematic        *sxpf.Symbol
	SymTransclude      *sxpf.Symbol
	SymUnknown         *sxpf.Symbol
	SymVerbatimComment *sxpf.Symbol
	SymVerbatimEval    *sxpf.Symbol
	SymVerbatimHTML    *sxpf.Symbol
	SymVerbatimMath    *sxpf.Symbol
	SymVerbatimProg    *sxpf.Symbol
	SymVerbatimZettel  *sxpf.Symbol

	// Constant symbols for reference states.

	SymRefStateInvalid  *sxpf.Symbol
	SymRefStateZettel   *sxpf.Symbol
	SymRefStateSelf     *sxpf.Symbol
	SymRefStateFound    *sxpf.Symbol
	SymRefStateBroken   *sxpf.Symbol
	SymRefStateHosted   *sxpf.Symbol
	SymRefStateBased    *sxpf.Symbol
	SymRefStateQuery    *sxpf.Symbol
	SymRefStateExternal *sxpf.Symbol

	// Symbols for metadata types

	SymTypeCredential   *sxpf.Symbol
	SymTypeEmpty        *sxpf.Symbol
	SymTypeID           *sxpf.Symbol
	SymTypeIDSet        *sxpf.Symbol
	SymTypeNumber       *sxpf.Symbol
	SymTypeString       *sxpf.Symbol
	SymTypeTagSet       *sxpf.Symbol
	SymTypeTimestamp    *sxpf.Symbol
	SymTypeURL          *sxpf.Symbol
	SymTypeWord         *sxpf.Symbol
	SymTypeWordSet      *sxpf.Symbol
	SymTypeZettelmarkup *sxpf.Symbol
}

func (zs *ZettelSymbols) InitializeZettelSymbols(sf sxpf.SymbolFactory) {
	// Symbols for Metanodes
	zs.SymBlock = sf.MustMake(NameSymBlock)
	zs.SymInline = sf.MustMake(NameSymInline)
	zs.SymList = sf.MustMake(NameSymList)
	zs.SymMeta = sf.MustMake(NameSymMeta)
	zs.SymQuote = sf.MustMake(NameSymQuote)

	// Symbols for Zettel node types.
	zs.SymBLOB = sf.MustMake(NameSymBLOB)
	zs.SymCell = sf.MustMake(NameSymCell)
	zs.SymCellCenter = sf.MustMake(NameSymCellCenter)
	zs.SymCellLeft = sf.MustMake(NameSymCellLeft)
	zs.SymCellRight = sf.MustMake(NameSymCellRight)
	zs.SymCite = sf.MustMake(NameSymCite)
	zs.SymDescription = sf.MustMake(NameSymDescription)
	zs.SymEmbed = sf.MustMake(NameSymEmbed)
	zs.SymEmbedBLOB = sf.MustMake(NameSymEmbedBLOB)
	zs.SymEndnote = sf.MustMake(NameSymEndnote)
	zs.SymFormatEmph = sf.MustMake(NameSymFormatEmph)
	zs.SymFormatDelete = sf.MustMake(NameSymFormatDelete)
	zs.SymFormatInsert = sf.MustMake(NameSymFormatInsert)
	zs.SymFormatQuote = sf.MustMake(NameSymFormatQuote)
	zs.SymFormatSpan = sf.MustMake(NameSymFormatSpan)
	zs.SymFormatSub = sf.MustMake(NameSymFormatSub)
	zs.SymFormatSuper = sf.MustMake(NameSymFormatSuper)
	zs.SymFormatStrong = sf.MustMake(NameSymFormatStrong)
	zs.SymHard = sf.MustMake(NameSymHard)
	zs.SymHeading = sf.MustMake(NameSymHeading)
	zs.SymLinkInvalid = sf.MustMake(NameSymLinkInvalid)
	zs.SymLinkZettel = sf.MustMake(NameSymLinkZettel)
	zs.SymLinkSelf = sf.MustMake(NameSymLinkSelf)
	zs.SymLinkFound = sf.MustMake(NameSymLinkFound)
	zs.SymLinkBroken = sf.MustMake(NameSymLinkBroken)
	zs.SymLinkHosted = sf.MustMake(NameSymLinkHosted)
	zs.SymLinkBased = sf.MustMake(NameSymLinkBased)
	zs.SymLinkQuery = sf.MustMake(NameSymLinkQuery)
	zs.SymLinkExternal = sf.MustMake(NameSymLinkExternal)
	zs.SymListOrdered = sf.MustMake(NameSymListOrdered)
	zs.SymListUnordered = sf.MustMake(NameSymListUnordered)
	zs.SymListQuote = sf.MustMake(NameSymListQuote)
	zs.SymLiteralProg = sf.MustMake(NameSymLiteralProg)
	zs.SymLiteralComment = sf.MustMake(NameSymLiteralComment)
	zs.SymLiteralHTML = sf.MustMake(NameSymLiteralHTML)
	zs.SymLiteralInput = sf.MustMake(NameSymLiteralInput)
	zs.SymLiteralMath = sf.MustMake(NameSymLiteralMath)
	zs.SymLiteralOutput = sf.MustMake(NameSymLiteralOutput)
	zs.SymLiteralZettel = sf.MustMake(NameSymLiteralZettel)
	zs.SymMark = sf.MustMake(NameSymMark)
	zs.SymPara = sf.MustMake(NameSymPara)
	zs.SymRegionBlock = sf.MustMake(NameSymRegionBlock)
	zs.SymRegionQuote = sf.MustMake(NameSymRegionQuote)
	zs.SymRegionVerse = sf.MustMake(NameSymRegionVerse)
	zs.SymSoft = sf.MustMake(NameSymSoft)
	zs.SymSpace = sf.MustMake(NameSymSpace)
	zs.SymTable = sf.MustMake(NameSymTable)
	zs.SymText = sf.MustMake(NameSymText)
	zs.SymThematic = sf.MustMake(NameSymThematic)
	zs.SymTransclude = sf.MustMake(NameSymTransclude)
	zs.SymUnknown = sf.MustMake(NameSymUnknown)
	zs.SymVerbatimComment = sf.MustMake(NameSymVerbatimComment)
	zs.SymVerbatimEval = sf.MustMake(NameSymVerbatimEval)
	zs.SymVerbatimHTML = sf.MustMake(NameSymVerbatimHTML)
	zs.SymVerbatimMath = sf.MustMake(NameSymVerbatimMath)
	zs.SymVerbatimProg = sf.MustMake(NameSymVerbatimProg)
	zs.SymVerbatimZettel = sf.MustMake(NameSymVerbatimZettel)

	// Constant symbols for reference states.
	zs.SymRefStateInvalid = sf.MustMake(NameSymRefStateInvalid)
	zs.SymRefStateZettel = sf.MustMake(NameSymRefStateZettel)
	zs.SymRefStateSelf = sf.MustMake(NameSymRefStateSelf)
	zs.SymRefStateFound = sf.MustMake(NameSymRefStateFound)
	zs.SymRefStateBroken = sf.MustMake(NameSymRefStateBroken)
	zs.SymRefStateHosted = sf.MustMake(NameSymRefStateHosted)
	zs.SymRefStateBased = sf.MustMake(NameSymRefStateBased)
	zs.SymRefStateQuery = sf.MustMake(NameSymRefStateQuery)
	zs.SymRefStateExternal = sf.MustMake(NameSymRefStateExternal)

	// Symbols for metadata types.
	zs.SymTypeCredential = sf.MustMake(NameSymTypeCredential)
	zs.SymTypeEmpty = sf.MustMake(NameSymTypeEmpty)
	zs.SymTypeID = sf.MustMake(NameSymTypeID)
	zs.SymTypeIDSet = sf.MustMake(NameSymTypeIDSet)
	zs.SymTypeNumber = sf.MustMake(NameSymTypeNumber)
	zs.SymTypeString = sf.MustMake(NameSymTypeString)
	zs.SymTypeTagSet = sf.MustMake(NameSymTypeTagSet)
	zs.SymTypeTimestamp = sf.MustMake(NameSymTypeTimestamp)
	zs.SymTypeURL = sf.MustMake(NameSymTypeURL)
	zs.SymTypeWord = sf.MustMake(NameSymTypeWord)
	zs.SymTypeWordSet = sf.MustMake(NameSymTypeWordSet)
	zs.SymTypeZettelmarkup = sf.MustMake(NameSymTypeZettelmarkup)
}

Added sexpr/const_test.go.



























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//-----------------------------------------------------------------------------
// Copyright (c) 2023-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//-----------------------------------------------------------------------------

package sexpr_test

import (
	"testing"

	"codeberg.org/t73fde/sxpf"
	"zettelstore.de/c/sexpr"
)

func BenchmarkInitializeZettelSymbols(b *testing.B) {
	sf := sxpf.MakeMappedFactory()
	for i := 0; i < b.N; i++ {
		var zs sexpr.ZettelSymbols
		zs.InitializeZettelSymbols(sf)
	}
}

Added sexpr/sexpr.go.































































































































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//-----------------------------------------------------------------------------
// Copyright (c) 2022-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//-----------------------------------------------------------------------------

package sexpr

import (
	"codeberg.org/t73fde/sxpf"
	"zettelstore.de/c/attrs"
)

// GetAttributes traverses a s-expression list and returns an attribute structure.
func GetAttributes(seq *sxpf.List) (result attrs.Attributes) {
	for elem := seq; elem != nil; elem = elem.Tail() {
		p, ok := elem.Car().(*sxpf.List)
		if !ok || p == nil {
			continue
		}
		key := p.Car()
		if !sxpf.IsAtom(key) {
			continue
		}
		val := p.Cdr()
		if tail, ok2 := val.(*sxpf.List); ok2 {
			val = tail.Car()
		}
		if !sxpf.IsAtom(val) {
			continue
		}
		result = result.Set(key.String(), val.String())
	}
	return result
}

// GetMetaContent returns the metadata and the content of a sexpr encoded zettel.
func GetMetaContent(zettel sxpf.Object) (Meta, *sxpf.List) {
	if pair, ok := zettel.(*sxpf.List); ok {
		m := pair.Car()
		if s := pair.Tail(); s != nil {
			if content, ok2 := s.Car().(*sxpf.List); ok2 {
				return MakeMeta(m), content
			}
		}
		return MakeMeta(m), nil
	}
	return nil, nil
}

type Meta map[string]MetaValue
type MetaValue struct {
	Type  string
	Key   string
	Value sxpf.Object
}

func MakeMeta(val sxpf.Object) Meta {
	if result := doMakeMeta(val); len(result) > 0 {
		return result
	}
	return nil
}
func doMakeMeta(val sxpf.Object) Meta {
	result := make(map[string]MetaValue)
	for {
		if sxpf.IsNil(val) {
			return result
		}
		lst, ok := val.(*sxpf.List)
		if !ok {
			return result
		}
		if mv, ok2 := makeMetaValue(lst); ok2 {
			result[mv.Key] = mv
		}
		val = lst.Cdr()
	}
}
func makeMetaValue(pair *sxpf.List) (MetaValue, bool) {
	var result MetaValue
	typePair, ok := pair.Car().(*sxpf.List)
	if !ok {
		return result, false
	}
	typeVal, ok := typePair.Car().(*sxpf.Symbol)
	if !ok {
		return result, false
	}
	keyPair, ok := typePair.Cdr().(*sxpf.List)
	if !ok {
		return result, false
	}
	keyStr, ok := keyPair.Car().(sxpf.String)
	if !ok {
		return result, false
	}
	valPair, ok := keyPair.Cdr().(*sxpf.List)
	if !ok {
		return result, false
	}
	result.Type = typeVal.CanonicalName()
	result.Key = keyStr.String()
	result.Value = valPair.Car()
	return result, true
}

func (m Meta) GetString(key string) string {
	if v, found := m[key]; found {
		return v.Value.String()
	}
	return ""
}

func (m Meta) GetList(key string) *sxpf.List {
	if mv, found := m[key]; found {
		if seq, ok := mv.Value.(*sxpf.List); ok {
			return seq
		}
	}
	return nil
}

Deleted shtml/const.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2024-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2024-present Detlef Stern
//-----------------------------------------------------------------------------

package shtml

import "t73f.de/r/sx"

// Symbols for HTML header tags
var (
	SymBody   = sx.MakeSymbol("body")
	SymHead   = sx.MakeSymbol("head")
	SymHtml   = sx.MakeSymbol("html")
	SymMeta   = sx.MakeSymbol("meta")
	SymScript = sx.MakeSymbol("script")
	SymTitle  = sx.MakeSymbol("title")
)

// Symbols for HTML body tags
var (
	SymA          = sx.MakeSymbol("a")
	SymASIDE      = sx.MakeSymbol("aside")
	symBLOCKQUOTE = sx.MakeSymbol("blockquote")
	symBR         = sx.MakeSymbol("br")
	symCITE       = sx.MakeSymbol("cite")
	symCODE       = sx.MakeSymbol("code")
	symDD         = sx.MakeSymbol("dd")
	symDEL        = sx.MakeSymbol("del")
	SymDIV        = sx.MakeSymbol("div")
	symDL         = sx.MakeSymbol("dl")
	symDT         = sx.MakeSymbol("dt")
	symEM         = sx.MakeSymbol("em")
	SymEMBED      = sx.MakeSymbol("embed")
	SymFIGURE     = sx.MakeSymbol("figure")
	SymH1         = sx.MakeSymbol("h1")
	SymH2         = sx.MakeSymbol("h2")
	SymHR         = sx.MakeSymbol("hr")
	SymIMG        = sx.MakeSymbol("img")
	symINS        = sx.MakeSymbol("ins")
	symKBD        = sx.MakeSymbol("kbd")
	SymLI         = sx.MakeSymbol("li")
	symMARK       = sx.MakeSymbol("mark")
	SymOL         = sx.MakeSymbol("ol")
	SymP          = sx.MakeSymbol("p")
	symPRE        = sx.MakeSymbol("pre")
	symSAMP       = sx.MakeSymbol("samp")
	SymSPAN       = sx.MakeSymbol("span")
	SymSTRONG     = sx.MakeSymbol("strong")
	symSUB        = sx.MakeSymbol("sub")
	symSUP        = sx.MakeSymbol("sup")
	symTABLE      = sx.MakeSymbol("table")
	symTBODY      = sx.MakeSymbol("tbody")
	symTHEAD      = sx.MakeSymbol("thead")
	symTD         = sx.MakeSymbol("td")
	symTR         = sx.MakeSymbol("tr")
	SymUL         = sx.MakeSymbol("ul")
)

// Symbols for HTML attribute keys
var (
	symAttrAlt    = sx.MakeSymbol("alt")
	SymAttrClass  = sx.MakeSymbol("class")
	SymAttrHref   = sx.MakeSymbol("href")
	SymAttrId     = sx.MakeSymbol("id")
	SymAttrLang   = sx.MakeSymbol("lang")
	SymAttrOpen   = sx.MakeSymbol("open")
	SymAttrRel    = sx.MakeSymbol("rel")
	SymAttrRole   = sx.MakeSymbol("role")
	SymAttrSrc    = sx.MakeSymbol("src")
	SymAttrTarget = sx.MakeSymbol("target")
	SymAttrTitle  = sx.MakeSymbol("title")
	SymAttrType   = sx.MakeSymbol("type")
	SymAttrValue  = sx.MakeSymbol("value")
)

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//-----------------------------------------------------------------------------
// Copyright (c) 2023-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2023-present Detlef Stern
//-----------------------------------------------------------------------------

// Package shtml transforms a s-expr encoded zettel AST into a s-expr representation of HTML.
package shtml

import (
	"fmt"
	"net/url"
	"strconv"
	"strings"

	"t73f.de/r/sx"
	"t73f.de/r/sxwebs/sxhtml"
	"t73f.de/r/zsc/api"
	"t73f.de/r/zsc/attrs"
	"t73f.de/r/zsc/sz"
	"t73f.de/r/zsc/text"
	"codeberg.org/t73fde/sxhtml"
	"codeberg.org/t73fde/sxpf"
	"codeberg.org/t73fde/sxpf/builtins/quote"
	"codeberg.org/t73fde/sxpf/eval"
	"zettelstore.de/c/api"
	"zettelstore.de/c/attrs"
	"zettelstore.de/c/sexpr"
	"zettelstore.de/c/text"
)

// Evaluator will transform a s-expression that encodes the zettel AST into an s-expression
// Transformer will transform a s-expression that encodes the zettel AST into an s-expression
// that represents HTML.
type Evaluator struct {
type Transformer struct {
	sf            sxpf.SymbolFactory
	rebinder      RebindProc
	headingOffset int64
	unique        string
	endnotes      []endnoteInfo
	noLinks       bool // true iff output must not include links
	symAttr       *sxpf.Symbol
	symClass      *sxpf.Symbol
	symMeta       *sxpf.Symbol
	symA          *sxpf.Symbol
	symSpan       *sxpf.Symbol

	fns     map[string]EvalFn
	minArgs map[string]int
}

type endnoteInfo struct {
	noteAST *sxpf.List // Endnote as AST
	noteHx  *sxpf.List // Endnote as SxHTML
	attrs   *sxpf.List // attrs a-list
}

// NewEvaluator creates a new Evaluator object.
func NewEvaluator(headingOffset int) *Evaluator {
	ev := &Evaluator{
// NewTransformer creates a new transformer object.
func NewTransformer(headingOffset int, sf sxpf.SymbolFactory) *Transformer {
	if sf == nil {
		sf = sxpf.MakeMappedFactory()
	}
	return &Transformer{
		sf:            sf,
		rebinder:      nil,
		headingOffset: int64(headingOffset),
		symAttr:       sf.MustMake(sxhtml.NameSymAttr),
		symClass:      sf.MustMake("class"),
		symMeta:       sf.MustMake("meta"),
		symA:          sf.MustMake("a"),
		symSpan:       sf.MustMake("span"),

	}
		fns:     make(map[string]EvalFn, 128),
		minArgs: make(map[string]int, 128),
	}
}
	ev.bindMetadata()
	ev.bindBlocks()
	ev.bindInlines()
	return ev
}

// SymbolFactory returns the symbol factory to create HTML symbols.
func (tr *Transformer) SymbolFactory() sxpf.SymbolFactory { return tr.sf }

// SetUnique sets a prefix to make several HTML ids unique.
func (tr *Evaluator) SetUnique(s string) { tr.unique = s }
func (tr *Transformer) SetUnique(s string) { tr.unique = s }

// IsValidName returns true, if name is a valid symbol name.
func (tr *Evaluator) IsValidName(s string) bool { return s != "" }
func (tr *Transformer) IsValidName(s string) bool { return tr.sf.IsValidName(s) }

// Make a new HTML symbol.
func (tr *Transformer) Make(s string) *sxpf.Symbol { return tr.sf.MustMake(s) }

// RebindProc is a procedure which is called every time before a tranformation takes place.
type RebindProc func(*TransformEnv)

// SetRebinder sets the rebinder procedure.
func (tr *Transformer) SetRebinder(rb RebindProc) { tr.rebinder = rb }

// EvaluateAttrbute transforms the given attributes into a HTML s-expression.
func (tr *Evaluator) EvaluateAttrbute(a attrs.Attributes) *sx.Pair {
// TransformAttrbute transforms the given attributes into a HTML s-expression.
func (tr *Transformer) TransformAttrbute(a attrs.Attributes) *sxpf.List {
	if len(a) == 0 {
		return nil
		return sxpf.Nil()
	}
	plist := sx.Nil()
	plist := sxpf.Nil()
	keys := a.Keys()
	for i := len(keys) - 1; i >= 0; i-- {
		key := keys[i]
		if key != attrs.DefaultAttribute && tr.IsValidName(key) {
			plist = plist.Cons(sx.Cons(sx.MakeSymbol(key), sx.MakeString(a[key])))
			plist = plist.Cons(sxpf.Cons(tr.Make(key), sxpf.MakeString(a[key])))
		}
	}
	if plist == nil {
		return nil
		return sxpf.Nil()
	}
	return plist.Cons(sxhtml.SymAttr)
	return plist.Cons(tr.symAttr)
}

// Evaluate a metadata s-expression into a list of HTML s-expressions.
func (ev *Evaluator) Evaluate(lst *sx.Pair, env *Environment) (*sx.Pair, error) {
// TransformMeta creates a HTML meta s-expression
func (tr *Transformer) TransformMeta(a attrs.Attributes) *sxpf.List {
	result := ev.Eval(lst, env)
	if err := env.err; err != nil {
		return nil, err
	}
	pair, isPair := sx.GetPair(result)
	if !isPair {
	return sxpf.Nil().Cons(tr.TransformAttrbute(a)).Cons(tr.symMeta)
}

// Transform an AST s-expression into a list of HTML s-expressions.
func (tr *Transformer) Transform(lst *sxpf.List) (*sxpf.List, error) {
	astSF := sxpf.FindSymbolFactory(lst)
	if astSF != nil {
		return nil, fmt.Errorf("evaluation does not result in a pair, but %T/%v", result, result)
	}

	for i := 0; i < len(env.endnotes); i++ {
		// May extend tr.endnotes -> do not use for i := range len(...)!!!

		if env.endnotes[i].noteHx != nil {
			continue
		}
		if astSF == tr.sf {
			panic("Invalid AST SymbolFactory")
		}
	} else {
		astSF = sxpf.MakeMappedFactory()
	}
	astEnv := sxpf.MakeRootEnvironment()
	engine := eval.MakeEngine(astSF, astEnv, eval.MakeDefaultParser(), eval.MakeSimpleExecutor())
	quote.InstallQuote(engine, sexpr.NameSymQuote, nil, 0)
	te := TransformEnv{
		tr:      tr,
		astSF:   astSF,
		astEnv:  astEnv,
		err:     nil,
		textEnc: text.NewEncoder(astSF),
	}
	te.initialize()
	if rb := tr.rebinder; rb != nil {
		rb(&te)
	}

		noteHx, _ := ev.EvaluateList(env.endnotes[i].noteAST, env)
		env.endnotes[i].noteHx = noteHx
	val, err := engine.Eval(te.astEnv, lst)
	if err != nil {
		return sxpf.Nil(), err
	}
	res, ok := val.(*sxpf.List)
	if !ok {
		panic("Result is not a list")

	return pair, nil
}

	}
	for i := 0; i < len(tr.endnotes); i++ {
		// May extend tr.endnotes
		val, err = engine.Eval(te.astEnv, tr.endnotes[i].noteAST)
		if err != nil {
			return res, err
		}
		en, ok2 := val.(*sxpf.List)
		if !ok2 {
			panic("Endnote is not a list")
		}
// EvaluateList will evaluate all list elements separately and returns them as a sx.Pair list
func (ev *Evaluator) EvaluateList(lst sx.Vector, env *Environment) (*sx.Pair, error) {
	var result sx.ListBuilder
	for _, elem := range lst {
		p := ev.Eval(elem, env)
		tr.endnotes[i].noteHx = en
		result.Add(p)
	}
	if err := env.err; err != nil {
		return nil, err
	}
	return res, err

	return result.List(), nil
}

// Endnotes returns a SHTML object with all collected endnotes.
func (ev *Evaluator) Endnotes(env *Environment) *sx.Pair {
	if env.err != nil || len(env.endnotes) == 0 {
func (tr *Transformer) Endnotes() *sxpf.List {
	if len(tr.endnotes) == 0 {
		return nil
	}

	result := sxpf.Nil().Cons(tr.Make("ol"))
	var result sx.ListBuilder
	result.Add(SymOL)
	result.Add(sx.Nil().Cons(sx.Cons(SymAttrClass, sx.MakeString("zs-endnotes"))).Cons(sxhtml.SymAttr))
	for i, fni := range env.endnotes {
	currResult := result.AppendBang(sxpf.Nil().Cons(sxpf.Cons(tr.symClass, sxpf.MakeString("zs-endnotes"))).Cons(tr.symAttr))
	for i, fni := range tr.endnotes {
		noteNum := strconv.Itoa(i + 1)
		noteID := tr.unique + noteNum

		attrs := fni.attrs.Cons(sx.Cons(SymAttrClass, sx.MakeString("zs-endnote"))).
			Cons(sx.Cons(SymAttrValue, sx.MakeString(noteNum))).
			Cons(sx.Cons(SymAttrId, sx.MakeString("fn:"+fni.noteID))).
			Cons(sx.Cons(SymAttrRole, sx.MakeString("doc-endnote"))).
			Cons(sxhtml.SymAttr)
		attrs := fni.attrs.Cons(sxpf.Cons(tr.symClass, sxpf.MakeString("zs-endnote"))).
			Cons(sxpf.Cons(tr.Make("value"), sxpf.MakeString(noteNum))).
			Cons(sxpf.Cons(tr.Make("id"), sxpf.MakeString("fn:"+noteID))).
			Cons(sxpf.Cons(tr.Make("role"), sxpf.MakeString("doc-endnote"))).
			Cons(tr.symAttr)

		backref := sx.Nil().Cons(sx.MakeString("\u21a9\ufe0e")).
			Cons(sx.Nil().
				Cons(sx.Cons(SymAttrClass, sx.MakeString("zs-endnote-backref"))).
				Cons(sx.Cons(SymAttrHref, sx.MakeString("#fnref:"+fni.noteID))).
				Cons(sx.Cons(SymAttrRole, sx.MakeString("doc-backlink"))).
				Cons(sxhtml.SymAttr)).
			Cons(SymA)
		backref := sxpf.Nil().Cons(sxpf.MakeString("\u21a9\ufe0e")).
			Cons(sxpf.Nil().
				Cons(sxpf.Cons(tr.symClass, sxpf.MakeString("zs-endnote-backref"))).
				Cons(sxpf.Cons(tr.Make("href"), sxpf.MakeString("#fnref:"+noteID))).
				Cons(sxpf.Cons(tr.Make("role"), sxpf.MakeString("doc-backlink"))).
				Cons(tr.symAttr)).
			Cons(tr.symA)

		var li sx.ListBuilder
		li.Add(SymLI)
		li.Add(attrs)
		li.ExtendBang(fni.noteHx)
		li.Add(sx.MakeString(" "))
		li.Add(backref)
		result.Add(li.List())
	}
	return result.List()
}

// Environment where sz objects are evaluated to shtml objects
type Environment struct {
	err          error
	langStack    []string
	endnotes     []endnoteInfo
	quoteNesting uint
}

type endnoteInfo struct {
	noteID  string    // link id
	noteAST sx.Vector // Endnote as list of AST inline elements
	attrs   *sx.Pair  // attrs a-list
	noteHx  *sx.Pair  // Endnote as SxHTML
}

		li := sxpf.Nil().Cons(tr.Make("li"))
		li.AppendBang(attrs).
			ExtendBang(fni.noteHx).
			AppendBang(sxpf.MakeString(" ")).AppendBang(backref)
		currResult = currResult.AppendBang(li)
	}
	tr.endnotes = nil
// MakeEnvironment builds a new evaluation environment.
func MakeEnvironment(lang string) Environment {
	langStack := make([]string, 1, 16)
	langStack[0] = lang
	return Environment{
	return result
		err:          nil,
		langStack:    langStack,
		endnotes:     nil,
		quoteNesting: 0,
	}
}

}

// TransformEnv is the environment where the actual transformation takes places.
// GetError returns the last error found.
func (env *Environment) GetError() error { return env.err }

// Reset the environment.
func (env *Environment) Reset() {
type TransformEnv struct {
	tr          *Transformer
	astSF       sxpf.SymbolFactory
	astEnv      sxpf.Environment
	err         error
	textEnc     *text.Encoder
	env.langStack = env.langStack[0:1]
	env.endnotes = nil
	env.quoteNesting = 0
}

	symNoEscape *sxpf.Symbol
	symAttr     *sxpf.Symbol
	symMeta     *sxpf.Symbol
	symA        *sxpf.Symbol
	symSpan     *sxpf.Symbol
	symP        *sxpf.Symbol
}
// PushAttribute adds the current attributes to the environment.
func (env *Environment) pushAttributes(a attrs.Attributes) {
	if value, ok := a.Get("lang"); ok {
		env.langStack = append(env.langStack, value)
	} else {
		env.langStack = append(env.langStack, env.getLanguage())
	}

}

func (te *TransformEnv) initialize() {
// popAttributes removes the current attributes from the envrionment
func (env *Environment) popAttributes() {
	te.symNoEscape = te.Make(sxhtml.NameSymNoEscape)
	te.symAttr = te.tr.symAttr
	env.langStack = env.langStack[0 : len(env.langStack)-1]
}

	te.symMeta = te.tr.symMeta
// getLanguage returns the current language
func (env *Environment) getLanguage() string {
	return env.langStack[len(env.langStack)-1]
}

	te.symA = te.tr.symA
	te.symSpan = te.tr.symSpan
	te.symP = te.Make("p")

	te.bind(sexpr.NameSymList, 0, listArgs)
// EvalFn is a function to be called for evaluation.
type EvalFn func(sx.Vector, *Environment) sx.Object

func (ev *Evaluator) bind(sym *sx.Symbol, minArgs int, fn EvalFn) {
	te.bindMetadata()
	te.bindBlocks()
	symVal := sym.GetValue()
	ev.fns[symVal] = fn
	if minArgs > 0 {
	te.bindInlines()
		ev.minArgs[symVal] = minArgs
	}
}

}

func listArgs(args *sxpf.List) sxpf.Object { return args }
// ResolveBinding returns the function bound to the given name.
func (ev *Evaluator) ResolveBinding(sym *sx.Symbol) EvalFn {
	if fn, found := ev.fns[sym.GetValue()]; found {
		return fn
	}

	return nil
}

func (te *TransformEnv) bindMetadata() {
// Rebind overwrites a binding, but leaves the minimum number of arguments intact.
func (ev *Evaluator) Rebind(sym *sx.Symbol, fn EvalFn) {
	symVal := sym.GetValue()
	te.bind(sexpr.NameSymMeta, 0, listArgs)
	te.bind(sexpr.NameSymTypeZettelmarkup, 2, func(args *sxpf.List) sxpf.Object {
		a := make(attrs.Attributes, 2).
	if _, found := ev.fns[symVal]; !found {
		panic(sym)
	}
			Set("name", te.getString(args).String()).
			Set("content", te.textEnc.Encode(te.getList(args.Tail())))
		return te.transformMeta(a)
	})
	ev.fns[symVal] = fn
}

func (ev *Evaluator) bindMetadata() {
	ev.bind(sz.SymMeta, 0, ev.evalList)
	evalMetaString := func(args sx.Vector, env *Environment) sx.Object {
	metaString := func(args *sxpf.List) sxpf.Object {
		a := make(attrs.Attributes, 2).
			Set("name", ev.getSymbol(args[0], env).GetValue()).
			Set("content", getString(args[1], env).GetValue())
		return ev.EvaluateMeta(a)
			Set("name", te.getString(args).String()).
			Set("content", te.getString(args.Tail()).String())
		return te.transformMeta(a)
	}
	ev.bind(sz.SymTypeCredential, 2, evalMetaString)
	ev.bind(sz.SymTypeEmpty, 2, evalMetaString)
	ev.bind(sz.SymTypeID, 2, evalMetaString)
	ev.bind(sz.SymTypeNumber, 2, evalMetaString)
	ev.bind(sz.SymTypeString, 2, evalMetaString)
	ev.bind(sz.SymTypeTimestamp, 2, evalMetaString)
	ev.bind(sz.SymTypeURL, 2, evalMetaString)
	ev.bind(sz.SymTypeWord, 2, evalMetaString)
	te.bind(sexpr.NameSymTypeCredential, 2, metaString)
	te.bind(sexpr.NameSymTypeEmpty, 2, metaString)
	te.bind(sexpr.NameSymTypeID, 2, metaString)
	te.bind(sexpr.NameSymTypeNumber, 2, metaString)
	te.bind(sexpr.NameSymTypeString, 2, metaString)
	te.bind(sexpr.NameSymTypeTimestamp, 2, metaString)
	te.bind(sexpr.NameSymTypeURL, 2, metaString)
	te.bind(sexpr.NameSymTypeWord, 2, metaString)

	evalMetaSet := func(args sx.Vector, env *Environment) sx.Object {
	metaSet := func(args *sxpf.List) sxpf.Object {
		var sb strings.Builder
		for elem := getList(args[1], env); elem != nil; elem = elem.Tail() {
		for elem := te.getList(args.Tail()); elem != nil; elem = elem.Tail() {
			sb.WriteByte(' ')
			sb.WriteString(getString(elem.Car(), env).GetValue())
			sb.WriteString(te.getString(elem).String())
		}
		s := sb.String()
		if len(s) > 0 {
			s = s[1:]
		}
		a := make(attrs.Attributes, 2).
			Set("name", ev.getSymbol(args[0], env).GetValue()).
			Set("name", te.getString(args).String()).
			Set("content", s)
		return ev.EvaluateMeta(a)
		return te.transformMeta(a)
	}
	ev.bind(sz.SymTypeIDSet, 2, evalMetaSet)
	ev.bind(sz.SymTypeTagSet, 2, evalMetaSet)
	ev.bind(sz.SymTypeZettelmarkup, 2, func(args sx.Vector, env *Environment) sx.Object {
	te.bind(sexpr.NameSymTypeIDSet, 2, metaSet)
	te.bind(sexpr.NameSymTypeTagSet, 2, metaSet)
	te.bind(sexpr.NameSymTypeWordSet, 2, metaSet)
		a := make(attrs.Attributes, 2).
			Set("name", ev.getSymbol(args[0], env).GetValue()).
			Set("content", text.EvaluateInlineString(getList(args[1], env)))
		return ev.EvaluateMeta(a)
	})
}

// EvaluateMeta returns HTML meta object for an attribute.
func (ev *Evaluator) EvaluateMeta(a attrs.Attributes) *sx.Pair {
func (te *TransformEnv) bindBlocks() {
	return sx.Nil().Cons(ev.EvaluateAttrbute(a)).Cons(SymMeta)
}

	te.bind(sexpr.NameSymBlock, 0, listArgs)
	te.bind(sexpr.NameSymPara, 0, func(args *sxpf.List) sxpf.Object {
		for ; args != nil; args = args.Tail() {
			lst, ok := sxpf.GetList(args.Car())
			if !ok || lst != nil {
				break
			}
		}
func (ev *Evaluator) bindBlocks() {
	ev.bind(sz.SymBlock, 0, ev.evalList)
	ev.bind(sz.SymPara, 0, func(args sx.Vector, env *Environment) sx.Object {
		return ev.evalSlice(args, env).Cons(SymP)
		return args.Cons(te.symP)
	})
	ev.bind(sz.SymHeading, 5, func(args sx.Vector, env *Environment) sx.Object {
		nLevel := getInt64(args[0], env)
	te.bind(sexpr.NameSymHeading, 5, func(args *sxpf.List) sxpf.Object {
		nLevel := te.getInt64(args)
		if nLevel <= 0 {
			env.err = fmt.Errorf("%v is a negative level", nLevel)
			return sx.Nil()
			te.err = fmt.Errorf("%v is a negative level", nLevel)
			return sxpf.Nil()
		}
		level := strconv.FormatInt(nLevel+ev.headingOffset, 10)
		level := strconv.FormatInt(nLevel+te.tr.headingOffset, 10)
		headingSymbol := sx.MakeSymbol("h" + level)

		a := ev.GetAttributes(args[1], env)
		env.pushAttributes(a)
		defer env.popAttributes()
		if fragment := getString(args[3], env).GetValue(); fragment != "" {
			a = a.Set("id", ev.unique+fragment)
		argAttr := args.Tail()
		a := te.getAttributes(argAttr)
		argFragment := argAttr.Tail().Tail()
		if fragment := te.getString(argFragment).String(); fragment != "" {
			a = a.Set("id", te.tr.unique+fragment)
		}

		if result, _ := ev.EvaluateList(args[4:], env); result != nil {
		if result, ok := sxpf.GetList(argFragment.Tail().Car()); ok && result != nil {
			if len(a) > 0 {
				result = result.Cons(ev.EvaluateAttrbute(a))
				result = result.Cons(te.transformAttribute(a))
			}
			return result.Cons(headingSymbol)
			return result.Cons(te.Make("h" + level))
		}
		return sx.MakeList(headingSymbol, sx.MakeString("<MISSING TEXT>"))
		return sxpf.MakeList(te.Make("h"+level), sxpf.MakeString("<MISSING TEXT>"))
	})
	ev.bind(sz.SymThematic, 0, func(args sx.Vector, env *Environment) sx.Object {
		result := sx.Nil()
		if len(args) > 0 {
			if attrList := getList(args[0], env); attrList != nil {
				result = result.Cons(ev.EvaluateAttrbute(sz.GetAttributes(attrList)))
	te.bind(sexpr.NameSymThematic, 0, func(args *sxpf.List) sxpf.Object {
		result := sxpf.Nil()
		if args != nil {
			if attrList := te.getList(args); attrList != nil {
				result = result.Cons(te.transformAttribute(sexpr.GetAttributes(attrList)))
			}
		}
		return result.Cons(SymHR)
		return result.Cons(te.Make("hr"))
	})

	ev.bind(sz.SymListOrdered, 0, ev.makeListFn(SymOL))
	ev.bind(sz.SymListUnordered, 0, ev.makeListFn(SymUL))
	ev.bind(sz.SymDescription, 0, func(args sx.Vector, env *Environment) sx.Object {
		if len(args) == 0 {
			return sx.Nil()
	te.bind(sexpr.NameSymListOrdered, 0, te.makeListFn("ol"))
	te.bind(sexpr.NameSymListUnordered, 0, te.makeListFn("ul"))
	te.bind(sexpr.NameSymDescription, 0, func(args *sxpf.List) sxpf.Object {
		if args == nil {
			return sxpf.Nil()
		}
		var items sx.ListBuilder
		items.Add(symDL)
		items := sxpf.Nil().Cons(te.Make("dl"))
		curItem := items
		for pos := 0; pos < len(args); pos++ {
			term := ev.evalDescriptionTerm(getList(args[pos], env), env)
			items.Add(term.Cons(symDT))
		for elem := args; elem != nil; elem = elem.Tail() {
			term := te.getList(elem)
			curItem = curItem.AppendBang(term.Cons(te.Make("dt")))
			pos++
			if pos >= len(args) {
			elem = elem.Tail()
			if elem == nil {
				break
			}
			ddBlock := getList(ev.Eval(args[pos], env), env)
			ddBlock := te.getList(elem)
			if ddBlock == nil {
				continue
				break
			}
			for ddlst := ddBlock; ddlst != nil; ddlst = ddlst.Tail() {
				dditem := getList(ddlst.Car(), env)
				items.Add(dditem.Cons(symDD))
				dditem := te.getList(ddlst)
				curItem = curItem.AppendBang(dditem.Cons(te.Make("dd")))
			}
		}
		return items.List()
		return items
	})

	ev.bind(sz.SymListQuote, 0, func(args sx.Vector, env *Environment) sx.Object {
	te.bind(sexpr.NameSymListQuote, 0, func(args *sxpf.List) sxpf.Object {
		if args == nil {
			return sx.Nil()
			return sxpf.Nil()
		}
		var result sx.ListBuilder
		result.Add(symBLOCKQUOTE)
		for _, elem := range args {
			if quote, isPair := sx.GetPair(ev.Eval(elem, env)); isPair {
				result.Add(quote.Cons(sxhtml.SymListSplice))
		result := sxpf.Nil().Cons(te.Make("blockquote"))
		currResult := result
		for elem := args; elem != nil; elem = elem.Tail() {
			if quote, ok := elem.Car().(*sxpf.List); ok {
				currResult = currResult.AppendBang(quote.Cons(te.symP))
			}
		}
		return result.List()
		return result
	})

	ev.bind(sz.SymTable, 1, func(args sx.Vector, env *Environment) sx.Object {
		thead := sx.Nil()
		if header := getList(args[0], env); !sx.IsNil(header) {
			thead = sx.Nil().Cons(ev.evalTableRow(header, env)).Cons(symTHEAD)
	te.bind(sexpr.NameSymTable, 1, func(args *sxpf.List) sxpf.Object {
		thead := sxpf.Nil()
		if header := te.getList(args); header != nil {
			thead = sxpf.Nil().Cons(te.transformTableRow(header)).Cons(te.Make("thead"))
		}

		var tbody sx.ListBuilder
		if len(args) > 1 {
			tbody.Add(symTBODY)
			for _, row := range args[1:] {
				tbody.Add(ev.evalTableRow(getList(row, env), env))
		tbody := sxpf.Nil()
		if argBody := args.Tail(); argBody != nil {
			tbody = sxpf.Nil().Cons(te.Make("tbody"))
			curBody := tbody
			for row := argBody; row != nil; row = row.Tail() {
				curBody = curBody.AppendBang(te.transformTableRow(te.getList(row)))
			}
		}

		table := sx.Nil()
		if !tbody.IsEmpty() {
			table = table.Cons(tbody.List())
		table := sxpf.Nil()
		if tbody != nil {
			table = table.Cons(tbody)
		}
		if thead != nil {
			table = table.Cons(thead)
		}
		if table == nil {
			return sx.Nil()
			return sxpf.Nil()
		}
		return table.Cons(symTABLE)
		return table.Cons(te.Make("table"))
	})
	ev.bind(sz.SymCell, 0, ev.makeCellFn(""))
	ev.bind(sz.SymCellCenter, 0, ev.makeCellFn("center"))
	ev.bind(sz.SymCellLeft, 0, ev.makeCellFn("left"))
	ev.bind(sz.SymCellRight, 0, ev.makeCellFn("right"))
	te.bind(sexpr.NameSymCell, 0, te.makeCellFn(""))
	te.bind(sexpr.NameSymCellCenter, 0, te.makeCellFn("center"))
	te.bind(sexpr.NameSymCellLeft, 0, te.makeCellFn("left"))
	te.bind(sexpr.NameSymCellRight, 0, te.makeCellFn("right"))

	ev.bind(sz.SymRegionBlock, 2, ev.makeRegionFn(SymDIV, true))
	ev.bind(sz.SymRegionQuote, 2, ev.makeRegionFn(symBLOCKQUOTE, false))
	ev.bind(sz.SymRegionVerse, 2, ev.makeRegionFn(SymDIV, false))
	te.bind(sexpr.NameSymRegionBlock, 2, te.makeRegionFn(te.Make("div"), true))
	te.bind(sexpr.NameSymRegionQuote, 2, te.makeRegionFn(te.Make("blockquote"), false))
	te.bind(sexpr.NameSymRegionVerse, 2, te.makeRegionFn(te.Make("div"), false))

	ev.bind(sz.SymVerbatimComment, 1, func(args sx.Vector, env *Environment) sx.Object {
		if ev.GetAttributes(args[0], env).HasDefault() {
			if len(args) > 1 {
				if s := getString(args[1], env); s.GetValue() != "" {
					return sx.Nil().Cons(s).Cons(sxhtml.SymBlockComment)
				}
			}
	te.bind(sexpr.NameSymVerbatimComment, 1, func(args *sxpf.List) sxpf.Object {
		if te.getAttributes(args).HasDefault() {
			if s := te.getString(args.Tail()); s != "" {
				t := sxpf.MakeString(s.String())
				return sxpf.Nil().Cons(t).Cons(te.Make(sxhtml.NameSymBlockComment))
			}
		}
		}
		return nil
	})

	ev.bind(sz.SymVerbatimEval, 2, func(args sx.Vector, env *Environment) sx.Object {
		return ev.evalVerbatim(ev.GetAttributes(args[0], env).AddClass("zs-eval"), getString(args[1], env))
	te.bind(sexpr.NameSymVerbatimEval, 2, func(args *sxpf.List) sxpf.Object {
		return te.transformVerbatim(te.getAttributes(args).AddClass("zs-eval"), te.getString(args.Tail()))
	})
	ev.bind(sz.SymVerbatimHTML, 2, ev.evalHTML)
	ev.bind(sz.SymVerbatimMath, 2, func(args sx.Vector, env *Environment) sx.Object {
		return ev.evalVerbatim(ev.GetAttributes(args[0], env).AddClass("zs-math"), getString(args[1], env))
	te.bind(sexpr.NameSymVerbatimHTML, 2, te.transformHTML)
	te.bind(sexpr.NameSymVerbatimMath, 2, func(args *sxpf.List) sxpf.Object {
		return te.transformVerbatim(te.getAttributes(args).AddClass("zs-math"), te.getString(args.Tail()))
	})
	ev.bind(sz.SymVerbatimProg, 2, func(args sx.Vector, env *Environment) sx.Object {
		a := ev.GetAttributes(args[0], env)
		content := getString(args[1], env)
	te.bind(sexpr.NameSymVerbatimProg, 2, func(args *sxpf.List) sxpf.Object {
		a := te.getAttributes(args)
		content := te.getString(args.Tail())
		if a.HasDefault() {
			content = sx.MakeString(visibleReplacer.Replace(content.GetValue()))
			content = sxpf.MakeString(visibleReplacer.Replace(content.String()))
		}
		return ev.evalVerbatim(a, content)
		return te.transformVerbatim(a, content)
	})
	ev.bind(sz.SymVerbatimZettel, 0, nilFn)
	ev.bind(sz.SymBLOB, 3, func(args sx.Vector, env *Environment) sx.Object {
		return ev.evalBLOB(getList(args[0], env), getString(args[1], env), getString(args[2], env))
	te.bind(sexpr.NameSymVerbatimZettel, 0, func(*sxpf.List) sxpf.Object { return sxpf.Nil() })

	te.bind(sexpr.NameSymBLOB, 3, func(args *sxpf.List) sxpf.Object {
		argSyntax := args.Tail()
		return te.transformBLOB(te.getList(args), te.getString(argSyntax), te.getString(argSyntax.Tail()))
	})

	ev.bind(sz.SymTransclude, 2, func(args sx.Vector, env *Environment) sx.Object {
		ref, isPair := sx.GetPair(args[1])
		if !isPair {
			return sx.Nil()
	te.bind(sexpr.NameSymTransclude, 2, func(args *sxpf.List) sxpf.Object {
		ref, ok := args.Tail().Car().(*sxpf.List)
		if !ok {
			return sxpf.Nil()
		}
		refKind := ref.Car()
		if sx.IsNil(refKind) {
			return sx.Nil()
		if sxpf.IsNil(refKind) {
			return sxpf.Nil()
		}
		if refValue := getString(ref.Tail().Car(), env); refValue.GetValue() != "" {
			if refSym, isRefSym := sx.GetSymbol(refKind); isRefSym && refSym.IsEqual(sz.SymRefStateExternal) {
				a := ev.GetAttributes(args[0], env).Set("src", refValue.GetValue()).AddClass("external")
				return sx.Nil().Cons(sx.Nil().Cons(ev.EvaluateAttrbute(a)).Cons(SymIMG)).Cons(SymP)
		if refValue := te.getString(ref.Tail()); refValue != "" {
			if te.astSF.MustMake(sexpr.NameSymRefStateExternal).IsEqual(refKind) {
				a := te.getAttributes(args).Set("src", refValue.String()).AddClass("external")
				return sxpf.Nil().Cons(sxpf.Nil().Cons(te.transformAttribute(a)).Cons(te.Make("img"))).Cons(te.symP)
			}
			return sx.MakeList(
				sxhtml.SymInlineComment,
				sx.MakeString("transclude"),
			return sxpf.MakeList(
				te.Make(sxhtml.NameSymInlineComment),
				sxpf.MakeString("transclude"),
				refKind,
				sx.MakeString("->"),
				sxpf.MakeString("->"),
				refValue,
			)
		}
		return ev.evalSlice(args, env)
		return args
	})
}

func (ev *Evaluator) makeListFn(sym *sx.Symbol) EvalFn {
	return func(args sx.Vector, env *Environment) sx.Object {
		var result sx.ListBuilder
		result.Add(sym)
		for _, elem := range args {
			item := sx.Nil().Cons(SymLI)
			if res, isPair := sx.GetPair(ev.Eval(elem, env)); isPair {
func (te *TransformEnv) makeListFn(tag string) transformFn {
	sym := te.Make(tag)
	return func(args *sxpf.List) sxpf.Object {
		result := sxpf.Nil().Cons(sym)
		last := result
		for elem := args; elem != nil; elem = elem.Tail() {
			item := sxpf.Nil().Cons(te.Make("li"))
			if res, ok := elem.Car().(*sxpf.List); ok {
				item.ExtendBang(res)
			}
			result.Add(item)
			last = last.AppendBang(item)
		}
		return result.List()
		return result
	}
}

func (ev *Evaluator) evalDescriptionTerm(term *sx.Pair, env *Environment) *sx.Pair {
	var result sx.ListBuilder
	for node := term; node != nil; node = node.Tail() {
		elem := ev.Eval(node.Car(), env)
		result.Add(elem)
	}
	return result.List()
}
func (te *TransformEnv) transformTableRow(cells *sxpf.List) *sxpf.List {
}

	row := sxpf.Nil().Cons(te.Make("tr"))
func (ev *Evaluator) evalTableRow(pairs *sx.Pair, env *Environment) *sx.Pair {
	if pairs == nil {
		return nil
	if cells == nil {
		return sxpf.Nil()
	}
	var row sx.ListBuilder
	curRow := row
	row.Add(symTR)
	for pair := pairs; pair != nil; pair = pair.Tail() {
		row.Add(ev.Eval(pair.Car(), env))
	for cell := cells; cell != nil; cell = cell.Tail() {
		curRow = curRow.AppendBang(cell.Car())
	}
	return row.List()
	return row
}

func (ev *Evaluator) makeCellFn(align string) EvalFn {
	return func(args sx.Vector, env *Environment) sx.Object {
		tdata := ev.evalSlice(args, env)
func (te *TransformEnv) makeCellFn(align string) transformFn {
	return func(args *sxpf.List) sxpf.Object {
		tdata := args
		if align != "" {
			tdata = tdata.Cons(ev.EvaluateAttrbute(attrs.Attributes{"class": align}))
			tdata = tdata.Cons(te.transformAttribute(attrs.Attributes{"class": align}))
		}
		return tdata.Cons(symTD)
		return tdata.Cons(te.Make("td"))
	}
}

func (ev *Evaluator) makeRegionFn(sym *sx.Symbol, genericToClass bool) EvalFn {
	return func(args sx.Vector, env *Environment) sx.Object {
func (te *TransformEnv) makeRegionFn(sym *sxpf.Symbol, genericToClass bool) transformFn {
	return func(args *sxpf.List) sxpf.Object {
		a := ev.GetAttributes(args[0], env)
		env.pushAttributes(a)
		a := te.getAttributes(args)
		defer env.popAttributes()
		if genericToClass {
			if val, found := a.Get(""); found {
				a = a.Remove("").AddClass(val)
			}
		}
		var result sx.ListBuilder
		result.Add(sym)
		result := sxpf.Nil()
		if len(a) > 0 {
			result.Add(ev.EvaluateAttrbute(a))
			result = result.Cons(te.transformAttribute(a))
		}
		result = result.Cons(sym)
		currResult := result.Last()
		if region, isPair := sx.GetPair(args[1]); isPair {
			if evalRegion := ev.EvalPairList(region, env); evalRegion != nil {
				result.ExtendBang(evalRegion)
			}
		blockArg := args.Tail()
		if region, ok := blockArg.Car().(*sxpf.List); ok {
			currResult = currResult.ExtendBang(region)
		}
		}
		if len(args) > 2 {
			if cite, _ := ev.EvaluateList(args[2:], env); cite != nil {
				result.Add(cite.Cons(symCITE))
		if citeArg := blockArg.Tail(); citeArg != nil {
			if cite, ok := citeArg.Car().(*sxpf.List); ok && cite != nil {
				currResult.AppendBang(cite.Cons(te.Make("cite")))
			}
		}
		return result.List()
		return result
	}
}

func (ev *Evaluator) evalVerbatim(a attrs.Attributes, s sx.String) sx.Object {
func (te *TransformEnv) transformVerbatim(a attrs.Attributes, s sxpf.String) sxpf.Object {
	a = setProgLang(a)
	code := sx.Nil().Cons(s)
	if al := ev.EvaluateAttrbute(a); al != nil {
	code := sxpf.Nil().Cons(s)
	if al := te.transformAttribute(a); al != nil {
		code = code.Cons(al)
	}
	code = code.Cons(symCODE)
	return sx.Nil().Cons(code).Cons(symPRE)
	code = code.Cons(te.Make("code"))
	return sxpf.Nil().Cons(code).Cons(te.Make("pre"))
}

func (ev *Evaluator) bindInlines() {
	ev.bind(sz.SymInline, 0, ev.evalList)
	ev.bind(sz.SymText, 1, func(args sx.Vector, env *Environment) sx.Object { return getString(args[0], env) })
	ev.bind(sz.SymSoft, 0, func(sx.Vector, *Environment) sx.Object { return sx.MakeString(" ") })
	ev.bind(sz.SymHard, 0, func(sx.Vector, *Environment) sx.Object { return sx.Nil().Cons(symBR) })
func (te *TransformEnv) bindInlines() {
	te.bind(sexpr.NameSymInline, 0, listArgs)
	te.bind(sexpr.NameSymText, 1, func(args *sxpf.List) sxpf.Object { return te.getString(args) })
	te.bind(sexpr.NameSymSpace, 0, func(args *sxpf.List) sxpf.Object {
		if args.IsNil() {
			return sxpf.MakeString(" ")
		}
		return te.getString(args)
	})
	te.bind(sexpr.NameSymSoft, 0, func(*sxpf.List) sxpf.Object { return sxpf.MakeString(" ") })
	brSym := te.Make("br")
	te.bind(sexpr.NameSymHard, 0, func(*sxpf.List) sxpf.Object { return sxpf.Nil().Cons(brSym) })

	ev.bind(sz.SymLinkInvalid, 2, func(args sx.Vector, env *Environment) sx.Object {
	te.bind(sexpr.NameSymLinkInvalid, 2, func(args *sxpf.List) sxpf.Object {
		a := ev.GetAttributes(args[0], env)
		env.pushAttributes(a)
		// a := te.getAttributes(args)
		defer env.popAttributes()
		var inline *sx.Pair
		if len(args) > 2 {
			inline = ev.evalSlice(args[2:], env)
		refArg := args.Tail()
		inline := refArg.Tail()
		}
		if inline == nil {
			inline = sx.Nil().Cons(ev.Eval(args[1], env))
			inline = sxpf.Nil().Cons(refArg.Car())
		}
		return inline.Cons(SymSPAN)
		return inline.Cons(te.symSpan)
	})
	evalHREF := func(args sx.Vector, env *Environment) sx.Object {
	transformHREF := func(args *sxpf.List) sxpf.Object {
		a := ev.GetAttributes(args[0], env)
		env.pushAttributes(a)
		a := te.getAttributes(args)
		defer env.popAttributes()
		refValue := getString(args[1], env)
		return ev.evalLink(a.Set("href", refValue.GetValue()), refValue, args[2:], env)
		refValue := te.getString(args.Tail())
		return te.transformLink(a.Set("href", refValue.String()), refValue, args.Tail().Tail())
	}
	ev.bind(sz.SymLinkZettel, 2, evalHREF)
	ev.bind(sz.SymLinkSelf, 2, evalHREF)
	ev.bind(sz.SymLinkFound, 2, evalHREF)
	ev.bind(sz.SymLinkBroken, 2, func(args sx.Vector, env *Environment) sx.Object {
	te.bind(sexpr.NameSymLinkZettel, 2, transformHREF)
	te.bind(sexpr.NameSymLinkSelf, 2, transformHREF)
	te.bind(sexpr.NameSymLinkFound, 2, transformHREF)
	te.bind(sexpr.NameSymLinkBroken, 2, func(args *sxpf.List) sxpf.Object {
		a := ev.GetAttributes(args[0], env)
		env.pushAttributes(a)
		a := te.getAttributes(args)
		defer env.popAttributes()
		refValue := getString(args[1], env)
		return ev.evalLink(a.AddClass("broken"), refValue, args[2:], env)
		refValue := te.getString(args.Tail())
		return te.transformLink(a.AddClass("broken"), refValue, args.Tail().Tail())
	})
	ev.bind(sz.SymLinkHosted, 2, evalHREF)
	ev.bind(sz.SymLinkBased, 2, evalHREF)
	ev.bind(sz.SymLinkQuery, 2, func(args sx.Vector, env *Environment) sx.Object {
	te.bind(sexpr.NameSymLinkHosted, 2, transformHREF)
	te.bind(sexpr.NameSymLinkBased, 2, transformHREF)
	te.bind(sexpr.NameSymLinkQuery, 2, func(args *sxpf.List) sxpf.Object {
		a := ev.GetAttributes(args[0], env)
		env.pushAttributes(a)
		a := te.getAttributes(args)
		defer env.popAttributes()
		refValue := getString(args[1], env)
		query := "?" + api.QueryKeyQuery + "=" + url.QueryEscape(refValue.GetValue())
		return ev.evalLink(a.Set("href", query), refValue, args[2:], env)
		refValue := te.getString(args.Tail())
		query := "?" + api.QueryKeyQuery + "=" + url.QueryEscape(refValue.String())
		return te.transformLink(a.Set("href", query), refValue, args.Tail().Tail())
	})
	ev.bind(sz.SymLinkExternal, 2, func(args sx.Vector, env *Environment) sx.Object {
	te.bind(sexpr.NameSymLinkExternal, 2, func(args *sxpf.List) sxpf.Object {
		a := ev.GetAttributes(args[0], env)
		env.pushAttributes(a)
		a := te.getAttributes(args)
		defer env.popAttributes()
		refValue := getString(args[1], env)
		return ev.evalLink(a.Set("href", refValue.GetValue()).AddClass("external"), refValue, args[2:], env)
		refValue := te.getString(args.Tail())
		return te.transformLink(a.Set("href", refValue.String()).AddClass("external"), refValue, args.Tail().Tail())
	})

	ev.bind(sz.SymEmbed, 3, func(args sx.Vector, env *Environment) sx.Object {
		ref := getList(args[1], env)
		syntax := getString(args[2], env).GetValue()
	te.bind(sexpr.NameSymEmbed, 3, func(args *sxpf.List) sxpf.Object {
		argRef := args.Tail()
		ref := te.getList(argRef)
		syntax := te.getString(argRef.Tail())
		if syntax == api.ValueSyntaxSVG {
			embedAttr := sx.MakeList(
				sxhtml.SymAttr,
				sx.Cons(SymAttrType, sx.MakeString("image/svg+xml")),
				sx.Cons(SymAttrSrc, sx.MakeString("/"+getString(ref.Tail(), env).GetValue()+".svg")),
			embedAttr := sxpf.MakeList(
				te.symAttr,
				sxpf.Cons(te.Make("type"), sxpf.MakeString("image/svg+xml")),
				sxpf.Cons(te.Make("src"), sxpf.MakeString("/"+te.getString(ref.Tail()).String()+".svg")),
			)
			return sx.MakeList(
			return sxpf.MakeList(
				SymFIGURE,
				sx.MakeList(
					SymEMBED,
				te.Make("figure"),
				sxpf.MakeList(
					te.Make("embed"),
					embedAttr,
				),
			)
		}
		a := ev.GetAttributes(args[0], env)
		a = a.Set("src", getString(ref.Tail().Car(), env).GetValue())
		a := te.getAttributes(args)
		a = a.Set("src", string(te.getString(ref.Tail())))
		if len(args) > 3 {
			var sb strings.Builder
			flattenText(&sb, sx.MakeList(args[3:]...))
			if d := sb.String(); d != "" {
				a = a.Set("alt", d)
			}
		var sb strings.Builder
		te.flattenText(&sb, ref.Tail().Tail().Tail())
		if d := sb.String(); d != "" {
			a = a.Set("alt", d)
		}
		}
		return sx.MakeList(SymIMG, ev.EvaluateAttrbute(a))
		return sxpf.MakeList(te.Make("img"), te.transformAttribute(a))
	})
	ev.bind(sz.SymEmbedBLOB, 3, func(args sx.Vector, env *Environment) sx.Object {
		a, syntax, data := ev.GetAttributes(args[0], env), getString(args[1], env), getString(args[2], env)
		summary, hasSummary := a.Get(api.KeySummary)
	te.bind(sexpr.NameSymEmbedBLOB, 3, func(args *sxpf.List) sxpf.Object {
		argSyntax := args.Tail()
		a, syntax, data := te.getAttributes(args), te.getString(argSyntax), te.getString(argSyntax.Tail())
		summary, _ := a.Get(api.KeySummary)
		if !hasSummary {
			summary = ""
		}
		return ev.evalBLOB(
			sx.MakeList(sxhtml.SymListSplice, sx.MakeString(summary)),
		return te.transformBLOB(
			sxpf.MakeList(te.astSF.MustMake(sexpr.NameSymInline), sxpf.MakeString(summary)),
			syntax,
			data,
		)
	})

	ev.bind(sz.SymCite, 2, func(args sx.Vector, env *Environment) sx.Object {
	te.bind(sexpr.NameSymCite, 2, func(args *sxpf.List) sxpf.Object {
		a := ev.GetAttributes(args[0], env)
		env.pushAttributes(a)
		defer env.popAttributes()
		result := sx.Nil()
		if key := getString(args[1], env); key.GetValue() != "" {
			if len(args) > 2 {
				result = ev.evalSlice(args[2:], env).Cons(sx.MakeString(", "))
		result := sxpf.Nil()
		argKey := args.Tail()
		if key := te.getString(argKey); key != "" {
			if text := argKey.Tail(); text != nil {
				result = text.Cons(sxpf.MakeString(", "))
			}
			result = result.Cons(key)
		}
		if len(a) > 0 {
			result = result.Cons(ev.EvaluateAttrbute(a))
		if a := te.getAttributes(args); len(a) > 0 {
			result = result.Cons(te.transformAttribute(a))
		}
		if result == nil {
			return nil
		}
		return result.Cons(SymSPAN)
	})
	ev.bind(sz.SymMark, 3, func(args sx.Vector, env *Environment) sx.Object {
		result := ev.evalSlice(args[3:], env)
		if !ev.noLinks {
			if fragment := getString(args[2], env).GetValue(); fragment != "" {
				a := attrs.Attributes{"id": fragment + ev.unique}
				return result.Cons(ev.EvaluateAttrbute(a)).Cons(SymA)
			}
		}
		return result.Cons(te.symSpan)
	})

		return result.Cons(SymSPAN)
	})
	ev.bind(sz.SymEndnote, 1, func(args sx.Vector, env *Environment) sx.Object {
		a := ev.GetAttributes(args[0], env)
	te.bind(sexpr.NameSymMark, 3, func(args *sxpf.List) sxpf.Object {
		argFragment := args.Tail().Tail()
		env.pushAttributes(a)
		defer env.popAttributes()
		attrPlist := sx.Nil()
		if len(a) > 0 {
		result := argFragment.Tail()
		if !te.tr.noLinks {
			if attrs := ev.EvaluateAttrbute(a); attrs != nil {
				attrPlist = attrs.Tail()
			if fragment := te.getString(argFragment); fragment != "" {
				a := attrs.Attributes{"id": fragment.String() + te.tr.unique}
				return result.Cons(te.transformAttribute(a)).Cons(te.symA)
			}
		}

		return result.Cons(te.symSpan)
		noteNum := strconv.Itoa(len(env.endnotes) + 1)
		noteID := ev.unique + noteNum
		env.endnotes = append(env.endnotes, endnoteInfo{
			noteID: noteID, noteAST: args[1:], noteHx: nil, attrs: attrPlist})
		hrefAttr := sx.Nil().Cons(sx.Cons(SymAttrRole, sx.MakeString("doc-noteref"))).
			Cons(sx.Cons(SymAttrHref, sx.MakeString("#fn:"+noteID))).
			Cons(sx.Cons(SymAttrClass, sx.MakeString("zs-noteref"))).
			Cons(sxhtml.SymAttr)
	})
		href := sx.Nil().Cons(sx.MakeString(noteNum)).Cons(hrefAttr).Cons(SymA)
		supAttr := sx.Nil().Cons(sx.Cons(SymAttrId, sx.MakeString("fnref:"+noteID))).Cons(sxhtml.SymAttr)
		return sx.Nil().Cons(href).Cons(supAttr).Cons(symSUP)
	})

	ev.bind(sz.SymFormatDelete, 1, ev.makeFormatFn(symDEL))
	ev.bind(sz.SymFormatEmph, 1, ev.makeFormatFn(symEM))
	ev.bind(sz.SymFormatInsert, 1, ev.makeFormatFn(symINS))
	ev.bind(sz.SymFormatMark, 1, ev.makeFormatFn(symMARK))
	ev.bind(sz.SymFormatQuote, 1, ev.evalQuote)
	te.bind(sexpr.NameSymEndnote, 1, func(args *sxpf.List) sxpf.Object {
	ev.bind(sz.SymFormatSpan, 1, ev.makeFormatFn(SymSPAN))
	ev.bind(sz.SymFormatStrong, 1, ev.makeFormatFn(SymSTRONG))
	ev.bind(sz.SymFormatSub, 1, ev.makeFormatFn(symSUB))
	ev.bind(sz.SymFormatSuper, 1, ev.makeFormatFn(symSUP))

		attrPlist := sxpf.Nil()
	ev.bind(sz.SymLiteralComment, 1, func(args sx.Vector, env *Environment) sx.Object {
		if ev.GetAttributes(args[0], env).HasDefault() {
		if a := te.getAttributes(args); len(a) > 0 {
			if len(args) > 1 {
				if s := getString(ev.Eval(args[1], env), env); s.GetValue() != "" {
					return sx.Nil().Cons(s).Cons(sxhtml.SymInlineComment)
				}
			}
		}
		return sx.Nil()
			if attrs := te.transformAttribute(a); attrs != nil {
				attrPlist = attrs.Tail()
			}
		}

		text, ok := args.Tail().Car().(*sxpf.List)
		if !ok {
			return sxpf.Nil()
		}
		te.tr.endnotes = append(te.tr.endnotes, endnoteInfo{noteAST: text, noteHx: nil, attrs: attrPlist})
		noteNum := strconv.Itoa(len(te.tr.endnotes))
		noteID := te.tr.unique + noteNum
		hrefAttr := sxpf.Nil().Cons(sxpf.Cons(te.Make("role"), sxpf.MakeString("doc-noteref"))).
			Cons(sxpf.Cons(te.Make("href"), sxpf.MakeString("#fn:"+noteID))).
			Cons(sxpf.Cons(te.tr.symClass, sxpf.MakeString("zs-noteref"))).
			Cons(te.symAttr)
		href := sxpf.Nil().Cons(sxpf.MakeString(noteNum)).Cons(hrefAttr).Cons(te.symA)
		supAttr := sxpf.Nil().Cons(sxpf.Cons(te.Make("id"), sxpf.MakeString("fnref:"+noteID))).Cons(te.symAttr)
		return sxpf.Nil().Cons(href).Cons(supAttr).Cons(te.Make("sup"))
	})
	ev.bind(sz.SymLiteralHTML, 2, ev.evalHTML)
	ev.bind(sz.SymLiteralInput, 2, func(args sx.Vector, env *Environment) sx.Object {

	te.bind(sexpr.NameSymFormatDelete, 1, te.makeFormatFn("del"))
		return ev.evalLiteral(args, nil, symKBD, env)
	})
	ev.bind(sz.SymLiteralMath, 2, func(args sx.Vector, env *Environment) sx.Object {
	te.bind(sexpr.NameSymFormatEmph, 1, te.makeFormatFn("em"))
		a := ev.GetAttributes(args[0], env).AddClass("zs-math")
		return ev.evalLiteral(args, a, symCODE, env)
	})
	ev.bind(sz.SymLiteralOutput, 2, func(args sx.Vector, env *Environment) sx.Object {
	te.bind(sexpr.NameSymFormatInsert, 1, te.makeFormatFn("ins"))
		return ev.evalLiteral(args, nil, symSAMP, env)
	})
	ev.bind(sz.SymLiteralProg, 2, func(args sx.Vector, env *Environment) sx.Object {
	te.bind(sexpr.NameSymFormatQuote, 1, te.transformQuote)
		return ev.evalLiteral(args, nil, symCODE, env)
	})

	ev.bind(sz.SymLiteralZettel, 0, nilFn)
	te.bind(sexpr.NameSymFormatSpan, 1, te.makeFormatFn("span"))
	te.bind(sexpr.NameSymFormatStrong, 1, te.makeFormatFn("strong"))
}

func (ev *Evaluator) makeFormatFn(sym *sx.Symbol) EvalFn {
	te.bind(sexpr.NameSymFormatSub, 1, te.makeFormatFn("sub"))
	te.bind(sexpr.NameSymFormatSuper, 1, te.makeFormatFn("sup"))
	return func(args sx.Vector, env *Environment) sx.Object {
		a := ev.GetAttributes(args[0], env)
		env.pushAttributes(a)
		defer env.popAttributes()
		if val, hasClass := a.Get(""); hasClass {
			a = a.Remove("").AddClass(val)
		}

	te.bind(sexpr.NameSymLiteralComment, 1, func(args *sxpf.List) sxpf.Object {
		if te.getAttributes(args).HasDefault() {
			if s := te.getString(args.Tail()); s != "" {
				return sxpf.Nil().Cons(s).Cons(te.Make(sxhtml.NameSymInlineComment))
			}
		res := ev.evalSlice(args[1:], env)
		if len(a) > 0 {
			res = res.Cons(ev.EvaluateAttrbute(a))
		}
		return res.Cons(sym)
	}
}

		return sxpf.Nil()
	})
	te.bind(sexpr.NameSymLiteralHTML, 2, te.transformHTML)
	kbdSym := te.Make("kbd")
	te.bind(sexpr.NameSymLiteralInput, 2, func(args *sxpf.List) sxpf.Object {
		return te.transformLiteral(args, nil, kbdSym)
	})
	codeSym := te.Make("code")
type quoteData struct {
	primLeft, primRight string
	secLeft, secRight   string
	nbsp                bool
}

	te.bind(sexpr.NameSymLiteralMath, 2, func(args *sxpf.List) sxpf.Object {
		a := te.getAttributes(args).AddClass("zs-math")
		return te.transformLiteral(args, a, codeSym)
	})
	sampSym := te.Make("samp")
var langQuotes = map[string]quoteData{
	"":              {"&quot;", "&quot;", "&quot;", "&quot;", false},
	api.ValueLangEN: {"&ldquo;", "&rdquo;", "&lsquo;", "&rsquo;", false},
	"de":            {"&bdquo;", "&ldquo;", "&sbquo;", "&lsquo;", false},
	"fr":            {"&laquo;", "&raquo;", "&lsaquo;", "&rsaquo;", true},
}

	te.bind(sexpr.NameSymLiteralOutput, 2, func(args *sxpf.List) sxpf.Object {
		return te.transformLiteral(args, nil, sampSym)
	})
	te.bind(sexpr.NameSymLiteralProg, 2, func(args *sxpf.List) sxpf.Object {
		return te.transformLiteral(args, nil, codeSym)
	})
func getQuoteData(lang string) quoteData {
	langFields := strings.FieldsFunc(lang, func(r rune) bool { return r == '-' || r == '_' })
	for len(langFields) > 0 {
		langSup := strings.Join(langFields, "-")
		quotes, ok := langQuotes[langSup]
		if ok {
			return quotes
		}

		langFields = langFields[0 : len(langFields)-1]
	}
	te.bind(sexpr.NameSymLiteralZettel, 0, func(*sxpf.List) sxpf.Object { return sxpf.Nil() })
}
	return langQuotes[""]
}


func (te *TransformEnv) makeFormatFn(tag string) transformFn {
func getQuotes(data *quoteData, env *Environment) (string, string) {
	if env.quoteNesting%2 == 0 {
		return data.primLeft, data.primRight
	}
	sym := te.Make(tag)
	return func(args *sxpf.List) sxpf.Object {
		a := te.getAttributes(args)
		if val, found := a.Get(""); found {
			a = a.Remove("").AddClass(val)
		}
	return data.secLeft, data.secRight
}

		res := args.Tail()
		if len(a) > 0 {
			res = res.Cons(te.transformAttribute(a))
		}
		return res.Cons(sym)
func (ev *Evaluator) evalQuote(args sx.Vector, env *Environment) sx.Object {
	a := ev.GetAttributes(args[0], env)
	env.pushAttributes(a)
	defer env.popAttributes()

	}
	if val, hasClass := a.Get(""); hasClass {
		a = a.Remove("").AddClass(val)
	}
}
	quotes := getQuoteData(env.getLanguage())
	leftQ, rightQ := getQuotes(&quotes, env)

	env.quoteNesting++
	res := ev.evalSlice(args[1:], env)
func (te *TransformEnv) transformQuote(args *sxpf.List) sxpf.Object {
	const langAttr = "lang"
	a := te.getAttributes(args)
	env.quoteNesting--

	langVal, found := a.Get(langAttr)
	lastPair := res.LastPair()
	if lastPair.IsNil() {
		res = sx.Cons(sx.MakeList(sxhtml.SymNoEscape, sx.MakeString(leftQ), sx.MakeString(rightQ)), sx.Nil())
	} else {
		if quotes.nbsp {
	if found {
			lastPair.AppendBang(sx.MakeList(sxhtml.SymNoEscape, sx.MakeString("&nbsp;"), sx.MakeString(rightQ)))
			res = res.Cons(sx.MakeList(sxhtml.SymNoEscape, sx.MakeString(leftQ), sx.MakeString("&nbsp;")))
		} else {
			lastPair.AppendBang(sx.MakeList(sxhtml.SymNoEscape, sx.MakeString(rightQ)))
			res = res.Cons(sx.MakeList(sxhtml.SymNoEscape, sx.MakeString(leftQ)))
		}
		a = a.Remove(langAttr)
	}
	if val, found2 := a.Get(""); found2 {
		a = a.Remove("").AddClass(val)
	}
	res := args.Tail()
	if len(a) > 0 {
		res = res.Cons(te.transformAttribute(a))
	}
		res = res.Cons(ev.EvaluateAttrbute(a))
		return res.Cons(SymSPAN)
	res = res.Cons(te.Make("q"))
	if found {
		res = sxpf.Nil().Cons(res).Cons(te.transformAttribute(attrs.Attributes{}.Set(langAttr, langVal))).Cons(te.symSpan)
	}
	return res.Cons(sxhtml.SymListSplice)
	return res
}

var visibleReplacer = strings.NewReplacer(" ", "\u2423")

func (ev *Evaluator) evalLiteral(args sx.Vector, a attrs.Attributes, sym *sx.Symbol, env *Environment) sx.Object {
func (te *TransformEnv) transformLiteral(args *sxpf.List, a attrs.Attributes, sym *sxpf.Symbol) sxpf.Object {
	if a == nil {
		a = ev.GetAttributes(args[0], env)
		a = te.getAttributes(args)
	}
	a = setProgLang(a)
	literal := getString(args[1], env).GetValue()
	literal := te.getString(args.Tail()).String()
	if a.HasDefault() {
		a = a.RemoveDefault()
		literal = visibleReplacer.Replace(literal)
	}
	res := sx.Nil().Cons(sx.MakeString(literal))
	res := sxpf.Nil().Cons(sxpf.MakeString(literal))
	if len(a) > 0 {
		res = res.Cons(ev.EvaluateAttrbute(a))
		res = res.Cons(te.transformAttribute(a))
	}
	return res.Cons(sym)
}

func setProgLang(a attrs.Attributes) attrs.Attributes {
	if val, found := a.Get(""); found {
		a = a.AddClass("language-" + val).Remove("")
	}
	return a
}

func (ev *Evaluator) evalHTML(args sx.Vector, env *Environment) sx.Object {
	if s := getString(ev.Eval(args[1], env), env); s.GetValue() != "" && IsSafe(s.GetValue()) {
		return sx.Nil().Cons(s).Cons(sxhtml.SymNoEscape)
func (te *TransformEnv) transformHTML(args *sxpf.List) sxpf.Object {
	if s := te.getString(args.Tail()); s != "" && IsSafe(s.String()) {
		return sxpf.Nil().Cons(s).Cons(te.symNoEscape)
	}
	return nil
}

func (ev *Evaluator) evalBLOB(description *sx.Pair, syntax, data sx.String) sx.Object {
	if data.GetValue() == "" {
		return sx.Nil()
func (te *TransformEnv) transformBLOB(description *sxpf.List, syntax, data sxpf.String) sxpf.Object {
	if data == "" {
		return sxpf.Nil()
	}
	switch syntax.GetValue() {
	switch syntax {
	case "":
		return sx.Nil()
		return sxpf.Nil()
	case api.ValueSyntaxSVG:
		return sx.Nil().Cons(sx.Nil().Cons(data).Cons(sxhtml.SymNoEscape)).Cons(SymP)
		return sxpf.Nil().Cons(sxpf.Nil().Cons(data).Cons(te.symNoEscape)).Cons(te.symP)
	default:
		imgAttr := sx.Nil().Cons(sx.Cons(SymAttrSrc, sx.MakeString("data:image/"+syntax.GetValue()+";base64,"+data.GetValue())))
		imgAttr := sxpf.Nil().Cons(sxpf.Cons(te.Make("src"), sxpf.MakeString("data:image/"+syntax.String()+";base64,"+data.String())))
		var sb strings.Builder
		flattenText(&sb, description)
		te.flattenText(&sb, description)
		if d := sb.String(); d != "" {
			imgAttr = imgAttr.Cons(sx.Cons(symAttrAlt, sx.MakeString(d)))
			imgAttr = imgAttr.Cons(sxpf.Cons(te.Make("alt"), sxpf.MakeString(d)))
		}
		return sx.Nil().Cons(sx.Nil().Cons(imgAttr.Cons(sxhtml.SymAttr)).Cons(SymIMG)).Cons(SymP)
		return sxpf.Nil().Cons(sxpf.Nil().Cons(imgAttr.Cons(te.symAttr)).Cons(te.Make("img"))).Cons(te.symP)
	}
}

func flattenText(sb *strings.Builder, lst *sx.Pair) {
func (te *TransformEnv) flattenText(sb *strings.Builder, lst *sxpf.List) {
	for elem := lst; elem != nil; elem = elem.Tail() {
		switch obj := elem.Car().(type) {
		case sx.String:
			sb.WriteString(obj.GetValue())
		case *sx.Pair:
			flattenText(sb, obj)
		case sxpf.String:
			sb.WriteString(obj.String())
		case *sxpf.List:
			te.flattenText(sb, obj)
		}
	}
}

func (ev *Evaluator) evalList(args sx.Vector, env *Environment) sx.Object {
	return ev.evalSlice(args, env)
}
func nilFn(sx.Vector, *Environment) sx.Object { return sx.Nil() }

// Eval evaluates an object in an environment.
type transformFn func(*sxpf.List) sxpf.Object
func (ev *Evaluator) Eval(obj sx.Object, env *Environment) sx.Object {
	if env.err != nil {
		return sx.Nil()
	}
	if sx.IsNil(obj) {
		return obj
	}
	lst, isLst := sx.GetPair(obj)

func (te *TransformEnv) bind(name string, minArity int, fn transformFn) {
	te.astEnv.Bind(te.astSF.MustMake(name), eval.MakeBuiltin(name, func(_ sxpf.Environment, args *sxpf.List) (sxpf.Object, error) {
		if nArgs := args.Length(); nArgs < minArity {
			return sxpf.Nil(), fmt.Errorf("not enough arguments (%d) for form %v (%d)", nArgs, name, minArity)
		}
		res := fn(args)
	if !isLst {
		return obj
	}
		return res, te.err
	}))
}
	sym, found := sx.GetSymbol(lst.Car())
	if !found {
		env.err = fmt.Errorf("symbol expected, but got %T/%v", lst.Car(), lst.Car())
		return sx.Nil()
	}
	symVal := sym.GetValue()
	fn, found := ev.fns[symVal]

func (te *TransformEnv) Rebind(name string, fn func(sxpf.Environment, *sxpf.List, sxpf.Callable) sxpf.Object) {
	sym := te.astSF.MustMake(name)
	obj, found := te.astEnv.Lookup(sym)
	if !found {
		env.err = fmt.Errorf("symbol %q not bound", sym)
		return sx.Nil()
		panic(sym.String())
	}
	var args sx.Vector
	for cdr := lst.Cdr(); !sx.IsNil(cdr); {
	preFn, ok := obj.(sxpf.Callable)
		pair, isPair := sx.GetPair(cdr)
		if !isPair {
	if !ok {
			break
		}
		args = append(args, pair.Car())
		panic(sym.String())
	}
	te.astEnv.Bind(sym, eval.MakeBuiltin(name, func(env sxpf.Environment, args *sxpf.List) (sxpf.Object, error) {
		res := fn(env, args, preFn)
		cdr = pair.Cdr()
	}
		return res, te.err
	}))
	if minArgs, hasMinArgs := ev.minArgs[symVal]; hasMinArgs {
		if minArgs > len(args) {
			env.err = fmt.Errorf("%v needs at least %d arguments, but got only %d", sym, minArgs, len(args))
			return sx.Nil()
		}
	}
}

	result := fn(args, env)
	if env.err != nil {
		return sx.Nil()
func (te *TransformEnv) Make(name string) *sxpf.Symbol { return te.tr.Make(name) }
func (te *TransformEnv) getString(lst *sxpf.List) sxpf.String {
	if te.err != nil {
		return ""
	}
	return result
}

	val := lst.Car()
func (ev *Evaluator) evalSlice(args sx.Vector, env *Environment) *sx.Pair {
	var result sx.ListBuilder
	for _, arg := range args {
		elem := ev.Eval(arg, env)
	if s, ok := val.(sxpf.String); ok {
		result.Add(elem)
	}
	if env.err == nil {
		return result.List()
		return s
	}
	te.err = fmt.Errorf("%v/%T is not a string", val, val)
	return nil
	return ""
}

func (te *TransformEnv) getInt64(lst *sxpf.List) int64 {
// EvaluatePairList evaluates a list of lists.
func (ev *Evaluator) EvalPairList(pair *sx.Pair, env *Environment) *sx.Pair {
	var result sx.ListBuilder
	for node := pair; node != nil; node = node.Tail() {
		elem := ev.Eval(node.Car(), env)
		result.Add(elem)
	}
	if env.err == nil {
		return result.List()
	if te.err != nil {
		return -1017
	}
	val := lst.Car()
	if num, ok := val.(*sxpf.Number); ok {
	return nil
}

		return num.GetInt64()
	}
	te.err = fmt.Errorf("%v/%T is not a number", val, val)
func (ev *Evaluator) evalLink(a attrs.Attributes, refValue sx.String, inline sx.Vector, env *Environment) sx.Object {
	result := ev.evalSlice(inline, env)
	if len(inline) == 0 {
		result = sx.Nil().Cons(refValue)
	}
	if ev.noLinks {
		return result.Cons(SymSPAN)
	}
	return -1017
}
	return result.Cons(ev.EvaluateAttrbute(a)).Cons(SymA)
}

func (te *TransformEnv) getList(lst *sxpf.List) *sxpf.List {
func (ev *Evaluator) getSymbol(obj sx.Object, env *Environment) *sx.Symbol {
	if env.err == nil {
		if sym, ok := sx.GetSymbol(obj); ok {
	if te.err == nil {
		val := lst.Car()
			return sym
		}
		env.err = fmt.Errorf("%v/%T is not a symbol", obj, obj)
	}
	return sx.MakeSymbol("???")
}
func getString(val sx.Object, env *Environment) sx.String {
	if env.err != nil {
		return sx.String{}
	}
	if s, ok := sx.GetString(val); ok {
		if res, ok := val.(*sxpf.List); ok {
		return s
	}
	env.err = fmt.Errorf("%v/%T is not a string", val, val)
	return sx.String{}
}
func getList(val sx.Object, env *Environment) *sx.Pair {
	if env.err == nil {
		if res, isPair := sx.GetPair(val); isPair {
			return res
		}
		env.err = fmt.Errorf("%v/%T is not a list", val, val)
		te.err = fmt.Errorf("%v/%T is not a list", val, val)
	}
	return nil
	return sxpf.Nil()
}
func getInt64(val sx.Object, env *Environment) int64 {
func (te *TransformEnv) getAttributes(args *sxpf.List) attrs.Attributes {
	if env.err != nil {
		return -1017
	}
	if num, ok := sx.GetNumber(val); ok {
		return int64(num.(sx.Int64))
	return sexpr.GetAttributes(te.getList(args))
}

func (te *TransformEnv) transformLink(a attrs.Attributes, refValue sxpf.String, inline *sxpf.List) sxpf.Object {
	result := inline
	if inline.IsNil() {
		result = sxpf.Nil().Cons(refValue)
	}
	env.err = fmt.Errorf("%v/%T is not a number", val, val)
	return -1017
}

// GetAttributes evaluates the given arg in the given environment and returns
// the contained attributes.
func (ev *Evaluator) GetAttributes(arg sx.Object, env *Environment) attrs.Attributes {
	return sz.GetAttributes(getList(arg, env))
	if te.tr.noLinks {
		return result.Cons(te.symSpan)
	}
	return result.Cons(te.transformAttribute(a)).Cons(te.symA)
}

func (te *TransformEnv) transformAttribute(a attrs.Attributes) *sxpf.List {
	return te.tr.TransformAttrbute(a)
}

func (te *TransformEnv) transformMeta(a attrs.Attributes) *sxpf.List {
	return te.tr.TransformMeta(a)
}

var unsafeSnippets = []string{
	"<script", "</script",
	"<iframe", "</iframe",
}

Deleted sz/const.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2022-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2022-present Detlef Stern
//-----------------------------------------------------------------------------

package sz

import "t73f.de/r/sx"

// Various constants for Zettel data. Some of them are technically variables.

var (
	// Symbols for Metanodes
	SymBlock  = sx.MakeSymbol("BLOCK")
	SymInline = sx.MakeSymbol("INLINE")
	SymMeta   = sx.MakeSymbol("META")

	// Symbols for Zettel noMakede types.
	SymBLOB            = sx.MakeSymbol("BLOB")
	SymCell            = sx.MakeSymbol("CELL")
	SymCellCenter      = sx.MakeSymbol("CELL-CENTER")
	SymCellLeft        = sx.MakeSymbol("CELL-LEFT")
	SymCellRight       = sx.MakeSymbol("CELL-RIGHT")
	SymCite            = sx.MakeSymbol("CITE")
	SymDescription     = sx.MakeSymbol("DESCRIPTION")
	SymEmbed           = sx.MakeSymbol("EMBED")
	SymEmbedBLOB       = sx.MakeSymbol("EMBED-BLOB")
	SymEndnote         = sx.MakeSymbol("ENDNOTE")
	SymFormatEmph      = sx.MakeSymbol("FORMAT-EMPH")
	SymFormatDelete    = sx.MakeSymbol("FORMAT-DELETE")
	SymFormatInsert    = sx.MakeSymbol("FORMAT-INSERT")
	SymFormatMark      = sx.MakeSymbol("FORMAT-MARK")
	SymFormatQuote     = sx.MakeSymbol("FORMAT-QUOTE")
	SymFormatSpan      = sx.MakeSymbol("FORMAT-SPAN")
	SymFormatSub       = sx.MakeSymbol("FORMAT-SUB")
	SymFormatSuper     = sx.MakeSymbol("FORMAT-SUPER")
	SymFormatStrong    = sx.MakeSymbol("FORMAT-STRONG")
	SymHard            = sx.MakeSymbol("HARD")
	SymHeading         = sx.MakeSymbol("HEADING")
	SymLinkInvalid     = sx.MakeSymbol("LINK-INVALID")
	SymLinkZettel      = sx.MakeSymbol("LINK-ZETTEL")
	SymLinkSelf        = sx.MakeSymbol("LINK-SELF")
	SymLinkFound       = sx.MakeSymbol("LINK-FOUND")
	SymLinkBroken      = sx.MakeSymbol("LINK-BROKEN")
	SymLinkHosted      = sx.MakeSymbol("LINK-HOSTED")
	SymLinkBased       = sx.MakeSymbol("LINK-BASED")
	SymLinkQuery       = sx.MakeSymbol("LINK-QUERY")
	SymLinkExternal    = sx.MakeSymbol("LINK-EXTERNAL")
	SymListOrdered     = sx.MakeSymbol("ORDERED")
	SymListUnordered   = sx.MakeSymbol("UNORDERED")
	SymListQuote       = sx.MakeSymbol("QUOTATION")
	SymLiteralProg     = sx.MakeSymbol("LITERAL-CODE")
	SymLiteralComment  = sx.MakeSymbol("LITERAL-COMMENT")
	SymLiteralHTML     = sx.MakeSymbol("LITERAL-HTML")
	SymLiteralInput    = sx.MakeSymbol("LITERAL-INPUT")
	SymLiteralMath     = sx.MakeSymbol("LITERAL-MATH")
	SymLiteralOutput   = sx.MakeSymbol("LITERAL-OUTPUT")
	SymLiteralZettel   = sx.MakeSymbol("LITERAL-ZETTEL")
	SymMark            = sx.MakeSymbol("MARK")
	SymPara            = sx.MakeSymbol("PARA")
	SymRegionBlock     = sx.MakeSymbol("REGION-BLOCK")
	SymRegionQuote     = sx.MakeSymbol("REGION-QUOTE")
	SymRegionVerse     = sx.MakeSymbol("REGION-VERSE")
	SymSoft            = sx.MakeSymbol("SOFT")
	SymTable           = sx.MakeSymbol("TABLE")
	SymText            = sx.MakeSymbol("TEXT")
	SymThematic        = sx.MakeSymbol("THEMATIC")
	SymTransclude      = sx.MakeSymbol("TRANSCLUDE")
	SymUnknown         = sx.MakeSymbol("UNKNOWN-NODE")
	SymVerbatimComment = sx.MakeSymbol("VERBATIM-COMMENT")
	SymVerbatimEval    = sx.MakeSymbol("VERBATIM-EVAL")
	SymVerbatimHTML    = sx.MakeSymbol("VERBATIM-HTML")
	SymVerbatimMath    = sx.MakeSymbol("VERBATIM-MATH")
	SymVerbatimProg    = sx.MakeSymbol("VERBATIM-CODE")
	SymVerbatimZettel  = sx.MakeSymbol("VERBATIM-ZETTEL")

	// Constant symbols for reference states.
	SymRefStateInvalid  = sx.MakeSymbol("INVALID")
	SymRefStateZettel   = sx.MakeSymbol("ZETTEL")
	SymRefStateSelf     = sx.MakeSymbol("SELF")
	SymRefStateFound    = sx.MakeSymbol("FOUND")
	SymRefStateBroken   = sx.MakeSymbol("BROKEN")
	SymRefStateHosted   = sx.MakeSymbol("HOSTED")
	SymRefStateBased    = sx.MakeSymbol("BASED")
	SymRefStateQuery    = sx.MakeSymbol("QUERY")
	SymRefStateExternal = sx.MakeSymbol("EXTERNAL")

	// Symbols for metadata types.
	SymTypeCredential   = sx.MakeSymbol("CREDENTIAL")
	SymTypeEmpty        = sx.MakeSymbol("EMPTY-STRING")
	SymTypeID           = sx.MakeSymbol("ZID")
	SymTypeIDSet        = sx.MakeSymbol("ZID-SET")
	SymTypeNumber       = sx.MakeSymbol("NUMBER")
	SymTypeString       = sx.MakeSymbol("STRING")
	SymTypeTagSet       = sx.MakeSymbol("TAG-SET")
	SymTypeTimestamp    = sx.MakeSymbol("TIMESTAMP")
	SymTypeURL          = sx.MakeSymbol("URL")
	SymTypeWord         = sx.MakeSymbol("WORD")
	SymTypeZettelmarkup = sx.MakeSymbol("ZETTELMARKUP")
)

Deleted sz/parser.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2024-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2024-present Detlef Stern
//-----------------------------------------------------------------------------

package sz

import (
	"t73f.de/r/sx"
	"t73f.de/r/zsc/api"
	"t73f.de/r/zsc/input"
)

// --- Contains some simple parsers

// ---- Syntax: none

// ParseNoneBlocks parses no block.
func ParseNoneBlocks(*input.Input) *sx.Pair { return nil }

// ParseNoneInlines skips to the end of line and parses no inline.
func ParseNoneInlines(inp *input.Input) *sx.Pair {
	inp.SkipToEOL()
	return nil
}

// ---- Some plain text syntaxes

// ParsePlainBlocks parses the block as plain text with the given syntax.
func ParsePlainBlocks(inp *input.Input, syntax string) *sx.Pair {
	var sym *sx.Symbol
	if syntax == api.ValueSyntaxHTML {
		sym = SymVerbatimHTML
	} else {
		sym = SymVerbatimProg
	}
	return sx.MakeList(
		sym,
		sx.MakeList(sx.Cons(sx.MakeString(""), sx.MakeString(syntax))),
		sx.MakeString(string(inp.ScanLineContent())),
	)
}

// ParsePlainInlines parses the inline as plain text with the given syntax.
func ParsePlainInlines(inp *input.Input, syntax string) *sx.Pair {
	var sym *sx.Symbol
	if syntax == api.ValueSyntaxHTML {
		sym = SymLiteralHTML
	} else {
		sym = SymLiteralProg
	}
	pos := inp.Pos
	inp.SkipToEOL()
	return sx.MakeList(
		sym,
		sx.MakeList(sx.Cons(sx.MakeString(""), sx.MakeString(syntax))),
		sx.MakeString(string(inp.Src[pos:inp.Pos])),
	)
}

Deleted sz/parser_test.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2024-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2024-present Detlef Stern
//-----------------------------------------------------------------------------

package sz_test

import (
	"testing"

	"t73f.de/r/zsc/input"
	"t73f.de/r/zsc/sz"
)

func TestParseNone(t *testing.T) {
	if got := sz.ParseNoneBlocks(nil); got != nil {
		t.Error("GOTB", got)
	}

	inp := input.NewInput([]byte("1234\n6789"))
	if got := sz.ParseNoneInlines(inp); got != nil {
		t.Error("GOTI", got)
	}
	if got := inp.Pos; got != 4 {
		t.Errorf("input should be on position 4, but is %d", got)
	}
	if got := inp.Ch; got != '\n' {
		t.Errorf("input character should be 10, but is %d", got)
	}
}

func TestParsePlani(t *testing.T) {
	testcases := []struct {
		src        string
		syntax     string
		expBlocks  string
		expInlines string
	}{
		{"abc", "html",
			"(VERBATIM-HTML ((\"\" . \"html\")) \"abc\")",
			"(LITERAL-HTML ((\"\" . \"html\")) \"abc\")"},
		{"abc\ndef", "html",
			"(VERBATIM-HTML ((\"\" . \"html\")) \"abc\\ndef\")",
			"(LITERAL-HTML ((\"\" . \"html\")) \"abc\")"},
		{"abc", "text",
			"(VERBATIM-CODE ((\"\" . \"text\")) \"abc\")",
			"(LITERAL-CODE ((\"\" . \"text\")) \"abc\")"},
		{"abc\nDEF", "text",
			"(VERBATIM-CODE ((\"\" . \"text\")) \"abc\\nDEF\")",
			"(LITERAL-CODE ((\"\" . \"text\")) \"abc\")"},
	}
	for i, tc := range testcases {
		t.Run(tc.syntax+":"+tc.src, func(t *testing.T) {
			inp := input.NewInput([]byte(tc.src))
			if got := sz.ParsePlainBlocks(inp, tc.syntax).String(); tc.expBlocks != got {
				t.Errorf("%d: %q/%v\nexpected: %q\ngot     : %q", i, tc.src, tc.syntax, tc.expBlocks, got)
			}
			inp.SetPos(0)
			if got := sz.ParsePlainInlines(inp, tc.syntax).String(); tc.expInlines != got {
				t.Errorf("%d: %q/%v\nexpected: %q\ngot     : %q", i, tc.src, tc.syntax, tc.expInlines, got)
			}
		})
	}
}

Deleted sz/sz.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2022-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2022-present Detlef Stern
//-----------------------------------------------------------------------------

// Package sz contains zettel data handling as sx expressions.
package sz

import (
	"t73f.de/r/sx"
	"t73f.de/r/zsc/attrs"
)

// GetAttributes traverses a s-expression list and returns an attribute structure.
func GetAttributes(seq *sx.Pair) (result attrs.Attributes) {
	for elem := seq; elem != nil; elem = elem.Tail() {
		pair, isPair := sx.GetPair(elem.Car())
		if !isPair || pair == nil {
			continue
		}
		key := pair.Car()
		if !key.IsAtom() {
			continue
		}
		val := pair.Cdr()
		if tail, isTailPair := sx.GetPair(val); isTailPair {
			val = tail.Car()
		}
		if !val.IsAtom() {
			continue
		}
		result = result.Set(GoValue(key), GoValue(val))
	}
	return result
}

// GoValue returns the string value of the sx.Object suitable for Go processing.
func GoValue(obj sx.Object) string {
	switch o := obj.(type) {
	case sx.String:
		return o.GetValue()
	case *sx.Symbol:
		return o.GetValue()
	}
	return obj.String()
}

// GetMetaContent returns the metadata and the content of a sz encoded zettel.
func GetMetaContent(zettel sx.Object) (Meta, *sx.Pair) {
	if pair, isPair := sx.GetPair(zettel); isPair {
		m := pair.Car()
		if s := pair.Tail(); s != nil {
			if content, isContentPair := sx.GetPair(s.Car()); isContentPair {
				return MakeMeta(m), content
			}
		}
		return MakeMeta(m), nil
	}
	return nil, nil
}

type Meta map[string]MetaValue
type MetaValue struct {
	Type  string
	Key   string
	Value sx.Object
}

func MakeMeta(obj sx.Object) Meta {
	if result := doMakeMeta(obj); len(result) > 0 {
		return result
	}
	return nil
}
func doMakeMeta(obj sx.Object) Meta {
	lst, isList := sx.GetPair(obj)
	if !isList || !lst.Car().IsEqual(SymMeta) {
		return nil
	}
	result := make(map[string]MetaValue)
	for node := lst.Tail(); node != nil; node = node.Tail() {
		if mv, found := makeMetaValue(node.Head()); found {
			result[mv.Key] = mv
		}
	}
	return result
}
func makeMetaValue(mnode *sx.Pair) (MetaValue, bool) {
	var result MetaValue
	typeSym, isSymbol := sx.GetSymbol(mnode.Car())
	if !isSymbol {
		return result, false
	}
	next := mnode.Tail()
	keySym, isSymbol := sx.GetSymbol(next.Car())
	if !isSymbol {
		return result, false
	}
	next = next.Tail()
	result.Type = typeSym.GetValue()
	result.Key = keySym.GetValue()
	result.Value = next.Car()
	return result, true
}

func (m Meta) GetString(key string) string {
	if v, found := m[key]; found {
		return GoValue(v.Value)
	}
	return ""
}

func (m Meta) GetPair(key string) *sx.Pair {
	if mv, found := m[key]; found {
		if pair, isPair := sx.GetPair(mv.Value); isPair {
			return pair
		}
	}
	return nil
}

// MapRefStateToLinkEmbed maps a reference state symbol to a link symbol or to
// an embed symbol, depending on 'forLink'.
func MapRefStateToLinkEmbed(symRefState *sx.Symbol, forLink bool) *sx.Symbol {
	if !forLink {
		return SymEmbed
	}
	if sym, found := mapRefStateLink[symRefState]; found {
		return sym
	}
	return SymLinkInvalid
}

var mapRefStateLink = map[*sx.Symbol]*sx.Symbol{
	SymRefStateInvalid:  SymLinkInvalid,
	SymRefStateZettel:   SymLinkZettel,
	SymRefStateSelf:     SymLinkSelf,
	SymRefStateFound:    SymLinkFound,
	SymRefStateBroken:   SymLinkBroken,
	SymRefStateHosted:   SymLinkHosted,
	SymRefStateBased:    SymLinkBased,
	SymRefStateQuery:    SymLinkQuery,
	SymRefStateExternal: SymLinkExternal,
}

// IsBreakSym return true if the object is either a soft or a hard break symbol.
func IsBreakSym(obj sx.Object) bool {
	return SymSoft.IsEqual(obj) || SymHard.IsEqual(obj)
}

Deleted sz/walk.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2024-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2024-present Detlef Stern
//-----------------------------------------------------------------------------

package sz

import "t73f.de/r/sx"

// Visitor is walking the sx-based AST.
type Visitor interface {
	Visit(node *sx.Pair, env *sx.Pair) sx.Object
}

// Walk a sx-based AST through a Visitor.
func Walk(v Visitor, node *sx.Pair, env *sx.Pair) *sx.Pair {
	if node == nil {
		return nil
	}
	if result, isPair := sx.GetPair(v.Visit(node, env)); isPair {
		return result
	}

	if sym, isSymbol := sx.GetSymbol(node.Car()); isSymbol {
		if fn, found := mapChildrenWalk[sym]; found {
			return fn(v, node, env)
		}
		return node
	}
	panic(node)
}

var mapChildrenWalk map[*sx.Symbol]func(Visitor, *sx.Pair, *sx.Pair) *sx.Pair

func init() {
	mapChildrenWalk = map[*sx.Symbol]func(Visitor, *sx.Pair, *sx.Pair) *sx.Pair{
		SymBlock:         walkChildrenTail,
		SymPara:          walkChildrenTail,
		SymRegionBlock:   walkChildrenRegion,
		SymRegionQuote:   walkChildrenRegion,
		SymRegionVerse:   walkChildrenRegion,
		SymHeading:       walkChildrenHeading,
		SymListOrdered:   walkChildrenTail,
		SymListUnordered: walkChildrenTail,
		SymListQuote:     walkChildrenTail,
		SymDescription:   walkChildrenDescription,
		SymTable:         walkChildrenTable,

		SymInline:       walkChildrenTail,
		SymEndnote:      walkChildrenInlines3,
		SymMark:         walkChildrenMark,
		SymLinkBased:    walkChildrenInlines4,
		SymLinkBroken:   walkChildrenInlines4,
		SymLinkExternal: walkChildrenInlines4,
		SymLinkFound:    walkChildrenInlines4,
		SymLinkHosted:   walkChildrenInlines4,
		SymLinkInvalid:  walkChildrenInlines4,
		SymLinkQuery:    walkChildrenInlines4,
		SymLinkSelf:     walkChildrenInlines4,
		SymLinkZettel:   walkChildrenInlines4,
		SymEmbed:        walkChildrenInlines4,
		SymCite:         walkChildrenInlines4,
		SymFormatDelete: walkChildrenInlines3,
		SymFormatEmph:   walkChildrenInlines3,
		SymFormatInsert: walkChildrenInlines3,
		SymFormatMark:   walkChildrenInlines3,
		SymFormatQuote:  walkChildrenInlines3,
		SymFormatStrong: walkChildrenInlines3,
		SymFormatSpan:   walkChildrenInlines3,
		SymFormatSub:    walkChildrenInlines3,
		SymFormatSuper:  walkChildrenInlines3,
	}
}

func walkChildrenTail(v Visitor, node *sx.Pair, env *sx.Pair) *sx.Pair {
	hasNil := false
	for n := node.Tail(); n != nil; n = n.Tail() {
		obj := Walk(v, n.Head(), env)
		if sx.IsNil(obj) {
			hasNil = true
		}
		n.SetCar(obj)
	}
	if !hasNil {
		return node
	}
	for n := node; ; {
		next := n.Tail()
		if next == nil {
			break
		}
		if sx.IsNil(next.Car()) {
			n.SetCdr(next.Cdr())
			continue
		}
		n = next
	}
	return node
}

func walkChildrenList(v Visitor, lst *sx.Pair, env *sx.Pair) *sx.Pair {
	hasNil := false
	for n := lst; n != nil; n = n.Tail() {
		obj := Walk(v, n.Head(), env)
		if sx.IsNil(obj) {
			hasNil = true
		}
		n.SetCar(obj)
	}
	if !hasNil {
		return lst
	}
	var result sx.ListBuilder
	for n := lst; n != nil; n = n.Tail() {
		obj := n.Car()
		if !sx.IsNil(obj) {
			result.Add(obj)
		}
	}
	return result.List()
}

func walkChildrenRegion(v Visitor, node *sx.Pair, env *sx.Pair) *sx.Pair {
	// sym := node.Car()
	next := node.Tail()
	// attrs := next.Car()
	next = next.Tail()
	next.SetCar(walkChildrenList(v, next.Head(), env))
	next.SetCdr(walkChildrenList(v, next.Tail(), env))
	return node
}

func walkChildrenHeading(v Visitor, node *sx.Pair, env *sx.Pair) *sx.Pair {
	// sym := node.Car()
	next := node.Tail()
	// level := next.Car()
	next = next.Tail()
	// attrs := next.Car()
	next = next.Tail()
	// slug := next.Car()
	next = next.Tail()
	// fragment := next.Car()
	next.SetCdr(walkChildrenList(v, next.Tail(), env))
	return node
}

func walkChildrenDescription(v Visitor, dn *sx.Pair, env *sx.Pair) *sx.Pair {
	for n := dn.Tail(); n != nil; n = n.Tail() {
		n.SetCar(walkChildrenList(v, n.Head(), env))
		n = n.Tail()
		if n == nil {
			break
		}
		n.SetCar(Walk(v, n.Head(), env))
	}
	return dn
}

func walkChildrenTable(v Visitor, tn *sx.Pair, env *sx.Pair) *sx.Pair {
	header := tn.Tail()
	header.SetCar(walkChildrenList(v, header.Tail(), env))
	for row := header.Tail(); row != nil; row = row.Tail() {
		row.SetCar(walkChildrenList(v, row.Head(), env))
	}
	return tn
}

func walkChildrenMark(v Visitor, mn *sx.Pair, env *sx.Pair) *sx.Pair {
	// sym := mn.Car()
	next := mn.Tail()
	// mark := next.Car()
	next = next.Tail()
	// slug := next.Car()
	next = next.Tail()
	// fragment := next.Car()
	next.SetCdr(walkChildrenList(v, next.Tail(), env))
	return mn
}

func walkChildrenInlines4(v Visitor, ln *sx.Pair, env *sx.Pair) *sx.Pair {
	// sym := ln.Car()
	next := ln.Tail()
	// attrs := next.Car()
	next = next.Tail()
	// val3 := next.Car()
	next.SetCdr(walkChildrenList(v, next.Tail(), env))
	return ln
}

func walkChildrenInlines3(v Visitor, node *sx.Pair, env *sx.Pair) *sx.Pair {
	// sym := node.Car()
	next := node.Tail() // Attrs
	// attrs := next.Car()
	next.SetCdr(walkChildrenList(v, next.Tail(), env))
	return node
}

Deleted sz/zmk/block.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
//-----------------------------------------------------------------------------

package zmk

import (
	"fmt"

	"t73f.de/r/sx"
	"t73f.de/r/zsc/input"
	"t73f.de/r/zsc/sz"
)

// parseBlock parses one block.
func (cp *zmkP) parseBlock(lastPara *sx.Pair) (res *sx.Pair, cont bool) {
	inp := cp.inp
	pos := inp.Pos
	if cp.nestingLevel <= maxNestingLevel {
		cp.nestingLevel++
		defer func() { cp.nestingLevel-- }()

		var bn *sx.Pair
		success := false

		switch inp.Ch {
		case input.EOS:
			return nil, false
		case '\n', '\r':
			inp.EatEOL()
			cp.cleanupListsAfterEOL()
			return nil, false
		case ':':
			bn, success = cp.parseColon()
		case '@', '`', runeModGrave, '%', '~', '$':
			cp.clearStacked()
			bn, success = cp.parseVerbatim()
		case '"', '<':
			cp.clearStacked()
			bn, success = cp.parseRegion()
		case '=':
			cp.clearStacked()
			bn, success = cp.parseHeading()
		case '-':
			cp.clearStacked()
			bn, success = cp.parseHRule()
		case '*', '#', '>':
			cp.lastRow = nil
			cp.descrl = nil
			bn, success = cp.parseNestedList()
		case ';':
			cp.lists = nil
			cp.lastRow = nil
			bn, success = cp.parseDefTerm()
		case ' ':
			cp.lastRow = nil
			bn, success = nil, cp.parseIndent()
		case '|':
			cp.lists = nil
			cp.descrl = nil
			bn, success = cp.parseRow(), true
		case '{':
			cp.clearStacked()
			bn, success = cp.parseTransclusion()
		}

		if success {
			return bn, false
		}
	}
	inp.SetPos(pos)
	cp.clearStacked()
	ins := cp.parsePara()
	if startsWithSpaceSoftBreak(ins) {
		ins = ins[2:]
	} else if lastPara != nil {
		lastPair := lastPara.LastPair()
		lastPair.ExtendBang(sx.MakeList(ins...))
		return nil, true
	}
	return sx.MakeList(ins...).Cons(sz.SymPara), false
}

func startsWithSpaceSoftBreak(ins sx.Vector) bool {
	if len(ins) < 2 {
		return false
	}
	pair0, isPair0 := sx.GetPair(ins[0])
	pair1, isPair1 := sx.GetPair(ins[0])
	if !isPair0 || !isPair1 {
		return false
	}
	if pair0.Car().IsEqual(sz.SymText) && sz.IsBreakSym(pair1.Car()) {
		if args := pair0.Tail(); args != nil {
			if val, isString := sx.GetString(args.Car()); isString {
				for _, ch := range val.GetValue() {
					if !input.IsSpace(ch) {
						return false
					}
				}
				return true
			}
		}
	}
	return false
}

var symSeparator = sx.MakeSymbol("sEpArAtOr")

func (cp *zmkP) cleanupListsAfterEOL() {
	for _, l := range cp.lists {
		l.LastPair().Head().LastPair().AppendBang(sx.Cons(symSeparator, nil))
	}
	if descrl := cp.descrl; descrl != nil {
		if lastPair, pos := lastPairPos(descrl); pos > 1 && pos%2 == 0 {
			lastPair.Head().LastPair().AppendBang(sx.Cons(symSeparator, nil))
		}
	}
}

// parseColon determines which element should be parsed.
func (cp *zmkP) parseColon() (*sx.Pair, bool) {
	inp := cp.inp
	if inp.PeekN(1) == ':' {
		cp.clearStacked()
		return cp.parseRegion()
	}
	return cp.parseDefDescr()
}

// parsePara parses paragraphed inline material as a sx.Vector.
func (cp *zmkP) parsePara() (result sx.Vector) {
	for {
		in := cp.parseInline()
		if in == nil {
			return result
		}
		result = append(result, in)
		if sz.IsBreakSym(in.Car()) {
			ch := cp.inp.Ch
			switch ch {
			// Must contain all cases from above switch in parseBlock.
			case input.EOS, '\n', '\r', '@', '`', runeModGrave, '%', '~', '$', '"', '<', '=', '-', '*', '#', '>', ';', ':', ' ', '|', '{':
				return result
			}
		}
	}
}

// countDelim read from input until a non-delimiter is found and returns number of delimiter chars.
func (cp *zmkP) countDelim(delim rune) int {
	inp := cp.inp
	cnt := 0
	for inp.Ch == delim {
		cnt++
		inp.Next()
	}
	return cnt
}

// parseVerbatim parses a verbatim block.
func (cp *zmkP) parseVerbatim() (rn *sx.Pair, success bool) {
	inp := cp.inp
	fch := inp.Ch
	cnt := cp.countDelim(fch)
	if cnt < 3 {
		return nil, false
	}
	attrs := cp.parseBlockAttributes()
	inp.SkipToEOL()
	if inp.Ch == input.EOS {
		return nil, false
	}
	var sym *sx.Symbol
	switch fch {
	case '@':
		sym = sz.SymVerbatimZettel
	case '`', runeModGrave:
		sym = sz.SymVerbatimProg
	case '%':
		sym = sz.SymVerbatimComment
	case '~':
		sym = sz.SymVerbatimEval
	case '$':
		sym = sz.SymVerbatimMath
	default:
		panic(fmt.Sprintf("%q is not a verbatim char", fch))
	}
	content := make([]byte, 0, 512)
	for {
		inp.EatEOL()
		posL := inp.Pos
		switch inp.Ch {
		case fch:
			if cp.countDelim(fch) >= cnt {
				inp.SkipToEOL()
				rn = sx.MakeList(sym, attrs, sx.MakeString(string(content)))
				return rn, true
			}
			inp.SetPos(posL)
		case input.EOS:
			return nil, false
		}
		inp.SkipToEOL()
		if len(content) > 0 {
			content = append(content, '\n')
		}
		content = append(content, inp.Src[posL:inp.Pos]...)
	}
}

// parseRegion parses a block region.
func (cp *zmkP) parseRegion() (rn *sx.Pair, success bool) {
	inp := cp.inp
	fch := inp.Ch
	cnt := cp.countDelim(fch)
	if cnt < 3 {
		return nil, false
	}

	var sym *sx.Symbol
	oldInVerse := cp.inVerse
	defer func() { cp.inVerse = oldInVerse }()
	switch fch {
	case ':':
		sym = sz.SymRegionBlock
	case '<':
		sym = sz.SymRegionQuote
	case '"':
		sym = sz.SymRegionVerse
		cp.inVerse = true
	default:
		panic(fmt.Sprintf("%q is not a region char", fch))
	}
	attrs := cp.parseBlockAttributes()
	inp.SkipToEOL()
	if inp.Ch == input.EOS {
		return nil, false
	}
	var blocksBuilder sx.ListBuilder
	var lastPara *sx.Pair
	inp.EatEOL()
	for {
		posL := inp.Pos
		switch inp.Ch {
		case fch:
			if cp.countDelim(fch) >= cnt {
				ins := cp.parseRegionLastLine()
				rn = ins.Cons(blocksBuilder.List()).Cons(attrs).Cons(sym)
				return rn, true
			}
			inp.SetPos(posL)
		case input.EOS:
			return nil, false
		}
		bn, cont := cp.parseBlock(lastPara)
		if bn != nil {
			blocksBuilder.Add(bn)
		}
		if !cont {
			lastPara = bn
		}
	}
}

// parseRegionLastLine parses the last line of a region and returns its inline text.
func (cp *zmkP) parseRegionLastLine() *sx.Pair {
	cp.clearStacked() // remove any lists defined in the region
	cp.skipSpace()
	var region sx.ListBuilder
	for {
		switch cp.inp.Ch {
		case input.EOS, '\n', '\r':
			return region.List()
		}
		in := cp.parseInline()
		if in == nil {
			return region.List()
		}
		region.Add(in)
	}
}

// parseHeading parses a head line.
func (cp *zmkP) parseHeading() (hn *sx.Pair, success bool) {
	inp := cp.inp
	delims := cp.countDelim(inp.Ch)
	if delims < 3 {
		return nil, false
	}
	if inp.Ch != ' ' {
		return nil, false
	}
	inp.Next()
	cp.skipSpace()
	if delims > 7 {
		delims = 7
	}
	level := int64(delims - 2)
	var attrs *sx.Pair
	var text sx.ListBuilder
	for {
		if input.IsEOLEOS(inp.Ch) {
			return createHeading(level, attrs, text.List()), true
		}
		in := cp.parseInline()
		if in == nil {
			return createHeading(level, attrs, text.List()), true
		}
		text.Add(in)
		if inp.Ch == '{' && inp.Peek() != '{' {
			attrs = cp.parseBlockAttributes()
			inp.SkipToEOL()
			return createHeading(level, attrs, text.List()), true
		}
	}
}
func createHeading(level int64, attrs, text *sx.Pair) *sx.Pair {
	return text.
		Cons(sx.MakeString("")). // Fragment
		Cons(sx.MakeString("")). // Slug
		Cons(attrs).
		Cons(sx.Int64(level)).
		Cons(sz.SymHeading)
}

// parseHRule parses a horizontal rule.
func (cp *zmkP) parseHRule() (hn *sx.Pair, success bool) {
	inp := cp.inp
	if cp.countDelim(inp.Ch) < 3 {
		return nil, false
	}

	attrs := cp.parseBlockAttributes()
	inp.SkipToEOL()
	return sx.MakeList(sz.SymThematic, attrs), true
}

// parseNestedList parses a list.
func (cp *zmkP) parseNestedList() (res *sx.Pair, success bool) {
	kinds := cp.parseNestedListKinds()
	if len(kinds) == 0 {
		return nil, false
	}
	cp.skipSpace()
	if !kinds[len(kinds)-1].IsEqual(sz.SymListQuote) && input.IsEOLEOS(cp.inp.Ch) {
		return nil, false
	}

	if len(kinds) < len(cp.lists) {
		cp.lists = cp.lists[:len(kinds)]
	}
	ln, newLnCount := cp.buildNestedList(kinds)
	pv := cp.parseLinePara()
	bn := sx.Cons(sz.SymBlock, nil)
	if len(pv) != 0 {
		bn.AppendBang(pv.MakeList().Cons(sz.SymPara))
	}
	lastItemPair := ln.LastPair()
	lastItemPair.AppendBang(bn)
	return cp.cleanupParsedNestedList(newLnCount)
}

func (cp *zmkP) parseNestedListKinds() []*sx.Symbol {
	inp := cp.inp
	result := make([]*sx.Symbol, 0, 8)
	for {
		var sym *sx.Symbol
		switch inp.Ch {
		case '*':
			sym = sz.SymListUnordered
		case '#':
			sym = sz.SymListOrdered
		case '>':
			sym = sz.SymListQuote
		default:
			panic(fmt.Sprintf("%q is not a region char", inp.Ch))
		}
		result = append(result, sym)
		switch inp.Next() {
		case '*', '#', '>':
		case ' ', input.EOS, '\n', '\r':
			return result
		default:
			return nil
		}
	}
}

func (cp *zmkP) buildNestedList(kinds []*sx.Symbol) (ln *sx.Pair, newLnCount int) {
	for i, kind := range kinds {
		if i < len(cp.lists) {
			if !cp.lists[i].Car().IsEqual(kind) {
				ln = sx.Cons(kind, nil)
				newLnCount++
				cp.lists[i] = ln
				cp.lists = cp.lists[:i+1]
			} else {
				ln = cp.lists[i]
			}
		} else {
			ln = sx.Cons(kind, nil)
			newLnCount++
			cp.lists = append(cp.lists, ln)
		}
	}
	return ln, newLnCount
}

func (cp *zmkP) cleanupParsedNestedList(newLnCount int) (res *sx.Pair, success bool) {
	childPos := len(cp.lists) - 1
	parentPos := childPos - 1
	for i := 0; i < newLnCount; i++ {
		if parentPos < 0 {
			return cp.lists[0], true
		}
		parentLn := cp.lists[parentPos]
		childLn := cp.lists[childPos]
		if firstParent := parentLn.Tail(); firstParent != nil {
			// Add list to last item of the parent list
			lastParent := firstParent.LastPair()
			lastParent.Head().LastPair().AppendBang(childLn)
		} else {
			// Set list to first child of parent.
			childBlock := sx.MakeList(sz.SymBlock, cp.lists[childPos])
			parentLn.LastPair().AppendBang(childBlock)
		}
		childPos--
		parentPos--
	}
	return nil, true
}

// parseDefTerm parses a term of a definition list.
func (cp *zmkP) parseDefTerm() (res *sx.Pair, success bool) {
	inp := cp.inp
	if inp.Next() != ' ' {
		return nil, false
	}
	inp.Next()
	cp.skipSpace()
	descrl := cp.descrl
	if descrl == nil {
		descrl = sx.Cons(sz.SymDescription, nil)
		cp.descrl = descrl
		res = descrl
	}
	lastPair, pos := lastPairPos(descrl)
	for {
		in := cp.parseInline()
		if in == nil {
			if pos%2 == 0 {
				// lastPair is either the empty description list or the last block of definitions
				return nil, false
			}
			// lastPair is the definition term
			return res, true
		}
		if pos%2 == 0 {
			// lastPair is either the empty description list or the last block of definitions
			lastPair = lastPair.AppendBang(sx.Cons(in, nil))
			pos++
		} else {
			// lastPair is the term part and we need to append the inline list just read
			lastPair.Head().LastPair().AppendBang(in)
		}
		if sz.IsBreakSym(in.Car()) {
			return res, true
		}
	}
}

// parseDefDescr parses a description of a definition list.
func (cp *zmkP) parseDefDescr() (res *sx.Pair, success bool) {
	inp := cp.inp
	if inp.Next() != ' ' {
		return nil, false
	}
	inp.Next()
	cp.skipSpace()
	descrl := cp.descrl
	lastPair, pos := lastPairPos(descrl)
	if descrl == nil || pos <= 0 {
		// No term given
		return nil, false
	}

	pn := cp.parseLinePara()
	if len(pn) == 0 {
		return nil, false
	}

	newDef := sx.MakeList(sz.SymBlock, pn.MakeList().Cons(sz.SymPara))
	if pos%2 == 1 {
		// Just a term, but no definitions
		lastPair.AppendBang(sx.MakeList(sz.SymBlock, newDef))
	} else {
		// lastPara points a the last definition
		lastPair.Head().LastPair().AppendBang(newDef)
	}
	return nil, true
}

func lastPairPos(p *sx.Pair) (*sx.Pair, int) {
	cnt := 0
	for node := p; node != nil; {
		next := node.Tail()
		if next == nil {
			return node, cnt
		}
		node = next
		cnt++
	}
	return nil, -1
}

// parseIndent parses initial spaces to continue a list.
func (cp *zmkP) parseIndent() bool {
	inp := cp.inp
	cnt := 0
	for {
		if inp.Next() != ' ' {
			break
		}
		cnt++
	}
	if cp.lists != nil {
		return cp.parseIndentForList(cnt)
	}
	if cp.descrl != nil {
		return cp.parseIndentForDescription(cnt)
	}
	return false
}

func (cp *zmkP) parseIndentForList(cnt int) bool {
	if len(cp.lists) < cnt {
		cnt = len(cp.lists)
	}
	cp.lists = cp.lists[:cnt]
	if cnt == 0 {
		return false
	}
	pv := cp.parseLinePara()
	if len(pv) == 0 {
		return false
	}
	ln := cp.lists[cnt-1]
	lbn := ln.LastPair().Head()
	lpn := lbn.LastPair().Head()
	pvList := pv.MakeList()
	if lpn.Car().IsEqual(sz.SymPara) {
		lpn.LastPair().SetCdr(pvList)
	} else {
		lbn.LastPair().AppendBang(pvList.Cons(sz.SymPara))
	}
	return true
}

func (cp *zmkP) parseIndentForDescription(cnt int) bool {
	descrl := cp.descrl
	lastPair, pos := lastPairPos(descrl)
	if cnt < 1 || pos < 1 {
		return false
	}
	if pos%2 == 1 {
		// Continuation of a definition term
		for {
			in := cp.parseInline()
			if in == nil {
				return true
			}
			lastPair.Head().LastPair().AppendBang(in)
			if sz.IsBreakSym(in.Car()) {
				return true
			}
		}
	}

	// Continuation of a definition description
	pn := cp.parseLinePara()
	if len(pn) == 0 {
		return false
	}
	bn := lastPair.Head()
	para := bn.LastPair().Head().LastPair().Head()
	pnList := pn.MakeList()
	if para.Car().IsEqual(sz.SymPara) {
		para.LastPair().SetCdr(pnList)
	} else {
		bn.LastPair().AppendBang(pnList.Cons(sz.SymPara))
	}
	return true
}

// parseLinePara parses one paragraph of inline material.
func (cp *zmkP) parseLinePara() sx.Vector {
	var ins sx.Vector
	for {
		in := cp.parseInline()
		if in == nil {
			return ins
		}
		ins = append(ins, in)
		if sz.IsBreakSym(in.Car()) {
			return ins
		}
	}
}

// parseRow parse one table row.
func (cp *zmkP) parseRow() *sx.Pair {
	inp := cp.inp
	if inp.Peek() == '%' {
		inp.SkipToEOL()
		return nil
	}
	//var row, curr *sx.Pair
	var row sx.ListBuilder
	for {
		inp.Next()
		cell := cp.parseCell()
		if cell != nil {
			row.Add(cell)
		}
		switch inp.Ch {
		case '\n', '\r':
			inp.EatEOL()
			fallthrough
		case input.EOS:
			// add to table
			if cp.lastRow == nil {
				if row.IsEmpty() {
					return nil
				}
				cp.lastRow = sx.Cons(row.List(), nil)
				return cp.lastRow.Cons(nil).Cons(sz.SymTable)
			}
			cp.lastRow = cp.lastRow.AppendBang(row.List())
			return nil
		}
		// inp.Ch must be '|'
	}
}

// parseCell parses one single cell of a table row.
func (cp *zmkP) parseCell() *sx.Pair {
	inp := cp.inp
	var cell sx.ListBuilder
	for {
		if input.IsEOLEOS(inp.Ch) {
			if cell.IsEmpty() {
				return nil
			}
			return cell.List().Cons(sz.SymCell)
		}
		if inp.Ch == '|' {
			return cell.List().Cons(sz.SymCell)
		}

		in := cp.parseInline()
		cell.Add(in)
	}
}

// parseTransclusion parses '{' '{' '{' ZID '}' '}' '}'
func (cp *zmkP) parseTransclusion() (*sx.Pair, bool) {
	if cp.countDelim('{') != 3 {
		return nil, false
	}
	inp := cp.inp
	posA, posE := inp.Pos, 0

loop:

	for {
		switch inp.Ch {
		case input.EOS:
			return nil, false
		case '\n', '\r', ' ', '\t':
			if !hasQueryPrefix(inp.Src[posA:]) {
				return nil, false
			}
		case '\\':
			switch inp.Next() {
			case input.EOS, '\n', '\r':
				return nil, false
			}
		case '}':
			posE = inp.Pos
			if posA >= posE {
				return nil, false
			}
			if inp.Next() != '}' {
				continue
			}
			if inp.Next() != '}' {
				continue
			}
			break loop
		}
		inp.Next()
	}
	inp.Next() // consume last '}'
	a := cp.parseBlockAttributes()
	inp.SkipToEOL()
	refText := string(inp.Src[posA:posE])
	ref := ParseReference(refText)
	return sx.MakeList(sz.SymTransclude, a, ref), true
}

Deleted sz/zmk/inline.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
//-----------------------------------------------------------------------------

package zmk

import (
	"fmt"
	"strings"

	"t73f.de/r/sx"
	"t73f.de/r/zsc/api"
	"t73f.de/r/zsc/input"
	"t73f.de/r/zsc/sz"
)

func (cp *zmkP) parseInline() *sx.Pair {
	inp := cp.inp
	pos := inp.Pos
	if cp.nestingLevel <= maxNestingLevel {
		cp.nestingLevel++
		defer func() { cp.nestingLevel-- }()

		var in *sx.Pair
		success := false
		switch inp.Ch {
		case input.EOS:
			return nil
		case '\n', '\r':
			return cp.parseSoftBreak()
		case '[':
			switch inp.Next() {
			case '[':
				in, success = cp.parseLinkEmbed('[', ']', true)
			case '@':
				in, success = cp.parseCite()
			case '^':
				in, success = cp.parseEndnote()
			case '!':
				in, success = cp.parseMark()
			}
		case '{':
			if inp.Next() == '{' {
				in, success = cp.parseLinkEmbed('{', '}', false)
			}
		case '%':
			in, success = cp.parseComment()
		case '_', '*', '>', '~', '^', ',', '"', '#', ':':
			in, success = cp.parseFormat()
		case '@', '\'', '`', '=', runeModGrave:
			in, success = cp.parseLiteral()
		case '$':
			in, success = cp.parseLiteralMath()
		case '\\':
			return cp.parseBackslash()
		case '-':
			in, success = cp.parseNdash()
		case '&':
			in, success = cp.parseEntity()
		}
		if success {
			return in
		}
	}
	inp.SetPos(pos)
	return cp.parseText()
}

func (cp *zmkP) parseText() *sx.Pair {
	return sx.MakeList(sz.SymText, cp.parseString())
}

func (cp *zmkP) parseString() sx.String {
	inp := cp.inp
	pos := inp.Pos
	if inp.Ch == '\\' {
		cp.inp.Next()
		return cp.parseBackslashRest()
	}
	for {
		switch inp.Next() {
		// The following case must contain all runes that occur in parseInline!
		// Plus the closing brackets ] and } and ) and the middle |
		case input.EOS, '\n', '\r', '[', ']', '{', '}', '(', ')', '|', '%', '_', '*', '>', '~', '^', ',', '"', '#', ':', '\'', '@', '`', runeModGrave, '$', '=', '\\', '-', '&':
			return sx.MakeString(string(inp.Src[pos:inp.Pos]))
		}
	}
}

func (cp *zmkP) parseBackslash() *sx.Pair {
	inp := cp.inp
	switch inp.Next() {
	case '\n', '\r':
		inp.EatEOL()
		return sx.MakeList(sz.SymHard)
	default:
		return sx.MakeList(sz.SymText, cp.parseBackslashRest())
	}
}

func (cp *zmkP) parseBackslashRest() sx.String {
	inp := cp.inp
	if input.IsEOLEOS(inp.Ch) {
		return sx.MakeString("\\")
	}
	if inp.Ch == ' ' {
		inp.Next()
		return sx.MakeString("\u00a0")
	}
	pos := inp.Pos
	inp.Next()
	return sx.MakeString(string(inp.Src[pos:inp.Pos]))
}

func (cp *zmkP) parseSoftBreak() *sx.Pair {
	cp.inp.EatEOL()
	return sx.MakeList(sz.SymSoft)
}

func (cp *zmkP) parseLinkEmbed(openCh, closeCh rune, forLink bool) (*sx.Pair, bool) {
	if refString, text, ok := cp.parseReference(openCh, closeCh); ok {
		attrs := cp.parseInlineAttributes()
		if len(refString) > 0 {
			ref := ParseReference(refString)
			refSym, _ := sx.GetSymbol(ref.Car())
			sym := sz.MapRefStateToLinkEmbed(refSym, forLink)
			ln := text.
				Cons(ref.Tail().Car()). // reference value
				Cons(attrs).
				Cons(sym)
			return ln, true
		}
	}
	return nil, false
}

func hasQueryPrefix(src []byte) bool {
	return len(src) > len(api.QueryPrefix) && string(src[:len(api.QueryPrefix)]) == api.QueryPrefix
}

func (cp *zmkP) parseReference(openCh, closeCh rune) (ref string, text *sx.Pair, _ bool) {
	inp := cp.inp
	inp.Next()
	cp.skipSpace()
	if inp.Ch == openCh {
		// Additional opening chars result in a fail
		return "", nil, false
	}
	var is sx.Vector
	pos := inp.Pos
	if !hasQueryPrefix(inp.Src[pos:]) {
		hasSpace, ok := cp.readReferenceToSep(closeCh)
		if !ok {
			return "", nil, false
		}
		if inp.Ch == '|' { // First part must be inline text
			if pos == inp.Pos { // [[| or {{|
				return "", nil, false
			}
			cp.inp = input.NewInput(inp.Src[pos:inp.Pos])
			for {
				in := cp.parseInline()
				if in == nil {
					break
				}
				is = append(is, in)
			}
			cp.inp = inp
			inp.Next()
		} else {
			if hasSpace {
				return "", nil, false
			}
			inp.SetPos(pos)
		}
	}

	cp.skipSpace()
	pos = inp.Pos
	if !cp.readReferenceToClose(closeCh) {
		return "", nil, false
	}
	ref = strings.TrimSpace(string(inp.Src[pos:inp.Pos]))
	if inp.Next() != closeCh {
		return "", nil, false
	}
	inp.Next()
	if len(is) == 0 {
		return ref, nil, true
	}
	return ref, sx.MakeList(is...), true
}

func (cp *zmkP) readReferenceToSep(closeCh rune) (bool, bool) {
	hasSpace := false
	inp := cp.inp
	for {
		switch inp.Ch {
		case input.EOS:
			return false, false
		case '\n', '\r', ' ':
			hasSpace = true
		case '|':
			return hasSpace, true
		case '\\':
			switch inp.Next() {
			case input.EOS:
				return false, false
			case '\n', '\r':
				hasSpace = true
			}
		case '%':
			if inp.Next() == '%' {
				inp.SkipToEOL()
			}
			continue
		case closeCh:
			if inp.Next() == closeCh {
				return hasSpace, true
			}
			continue
		}
		inp.Next()
	}
}

func (cp *zmkP) readReferenceToClose(closeCh rune) bool {
	inp := cp.inp
	pos := inp.Pos
	for {
		switch inp.Ch {
		case input.EOS:
			return false
		case '\t', '\r', '\n', ' ':
			if !hasQueryPrefix(inp.Src[pos:]) {
				return false
			}
		case '\\':
			switch inp.Next() {
			case input.EOS, '\n', '\r':
				return false
			}
		case closeCh:
			return true
		}
		inp.Next()
	}
}

func (cp *zmkP) parseCite() (*sx.Pair, bool) {
	inp := cp.inp
	switch inp.Next() {
	case ' ', ',', '|', ']', '\n', '\r':
		return nil, false
	}
	pos := inp.Pos
loop:
	for {
		switch inp.Ch {
		case input.EOS:
			return nil, false
		case ' ', ',', '|', ']', '\n', '\r':
			break loop
		}
		inp.Next()
	}
	posL := inp.Pos
	switch inp.Ch {
	case ' ', ',', '|':
		inp.Next()
	}
	ins, ok := cp.parseLinkLikeRest()
	if !ok {
		return nil, false
	}
	attrs := cp.parseInlineAttributes()
	cn := ins.Cons(sx.MakeString(string(inp.Src[pos:posL]))).Cons(attrs).Cons(sz.SymCite)
	return cn, true
}

func (cp *zmkP) parseEndnote() (*sx.Pair, bool) {
	cp.inp.Next()
	ins, ok := cp.parseLinkLikeRest()
	if !ok {
		return nil, false
	}
	attrs := cp.parseInlineAttributes()
	return ins.Cons(attrs).Cons(sz.SymEndnote), true
}

func (cp *zmkP) parseMark() (*sx.Pair, bool) {
	inp := cp.inp
	inp.Next()
	pos := inp.Pos
	for inp.Ch != '|' && inp.Ch != ']' {
		if !isNameRune(inp.Ch) {
			return nil, false
		}
		inp.Next()
	}
	mark := inp.Src[pos:inp.Pos]
	var ins *sx.Pair
	if inp.Ch == '|' {
		inp.Next()
		var ok bool
		ins, ok = cp.parseLinkLikeRest()
		if !ok {
			return nil, false
		}
	} else {
		inp.Next()
	}
	mn := ins.
		Cons(sx.MakeString("")). // Fragment
		Cons(sx.MakeString("")). // Slug
		Cons(sx.MakeString(string(mark))).
		Cons(sz.SymMark)
	return mn, true
	// Problematisch ist, dass hier noch nicht mn.Fragment und mn.Slug gesetzt werden.
	// Evtl. muss es ein PreMark-Symbol geben
}

func (cp *zmkP) parseLinkLikeRest() (*sx.Pair, bool) {
	cp.skipSpace()
	var ins sx.Vector
	inp := cp.inp
	for inp.Ch != ']' {
		in := cp.parseInline()
		if in == nil {
			return nil, false
		}
		ins = append(ins, in)
		if input.IsEOLEOS(inp.Ch) && sz.IsBreakSym(in.Car()) {
			return nil, false
		}
	}
	inp.Next()
	if len(ins) == 0 {
		return nil, true
	}
	return sx.MakeList(ins...), true
}

func (cp *zmkP) parseComment() (res *sx.Pair, success bool) {
	inp := cp.inp
	if inp.Next() != '%' {
		return nil, false
	}
	for inp.Ch == '%' {
		inp.Next()
	}
	attrs := cp.parseInlineAttributes()
	cp.skipSpace()
	pos := inp.Pos
	for {
		if input.IsEOLEOS(inp.Ch) {
			return sx.MakeList(
				sz.SymLiteralComment,
				attrs,
				sx.MakeString(string(inp.Src[pos:inp.Pos])),
			), true
		}
		inp.Next()
	}
}

var mapRuneFormat = map[rune]*sx.Symbol{
	'_': sz.SymFormatEmph,
	'*': sz.SymFormatStrong,
	'>': sz.SymFormatInsert,
	'~': sz.SymFormatDelete,
	'^': sz.SymFormatSuper,
	',': sz.SymFormatSub,
	'"': sz.SymFormatQuote,
	'#': sz.SymFormatMark,
	':': sz.SymFormatSpan,
}

func (cp *zmkP) parseFormat() (res *sx.Pair, success bool) {
	inp := cp.inp
	fch := inp.Ch
	symFormat, ok := mapRuneFormat[fch]
	if !ok {
		panic(fmt.Sprintf("%q is not a formatting char", fch))
	}
	// read 2nd formatting character
	if inp.Next() != fch {
		return nil, false
	}
	inp.Next()
	var inlines sx.Vector
	for {
		if inp.Ch == input.EOS {
			return nil, false
		}
		if inp.Ch == fch {
			if inp.Next() == fch {
				inp.Next()
				attrs := cp.parseInlineAttributes()
				fn := sx.MakeList(inlines...).Cons(attrs).Cons(symFormat)
				return fn, true
			}
			inlines = append(inlines, sx.MakeList(sz.SymText, sx.MakeString(string(fch))))
		} else if in := cp.parseInline(); in != nil {
			if input.IsEOLEOS(inp.Ch) && sz.IsBreakSym(in.Car()) {
				return nil, false
			}
			inlines = append(inlines, in)
		}
	}
}

var mapRuneLiteral = map[rune]*sx.Symbol{
	'@':          sz.SymLiteralZettel,
	'`':          sz.SymLiteralProg,
	runeModGrave: sz.SymLiteralProg,
	'\'':         sz.SymLiteralInput,
	'=':          sz.SymLiteralOutput,
	// No '$': sz.SymLiteralMath, because pairing literal math is a little different
}

func (cp *zmkP) parseLiteral() (res *sx.Pair, success bool) {
	inp := cp.inp
	fch := inp.Ch
	symLiteral, ok := mapRuneLiteral[fch]
	if !ok {
		panic(fmt.Sprintf("%q is not a formatting char", fch))
	}
	// read 2nd formatting character
	if inp.Next() != fch {
		return nil, false
	}
	inp.Next()
	var sb strings.Builder
	for {
		if inp.Ch == input.EOS {
			return nil, false
		}
		if inp.Ch == fch {
			if inp.Peek() == fch {
				inp.Next()
				inp.Next()
				return createLiteralNode(symLiteral, cp.parseInlineAttributes(), sb.String()), true
			}
			sb.WriteRune(fch)
			inp.Next()
		} else {
			s := cp.parseString()
			sb.WriteString(s.GetValue())
		}
	}
}

func createLiteralNode(sym *sx.Symbol, attrs *sx.Pair, content string) *sx.Pair {
	if sym.IsEqual(sz.SymLiteralZettel) {
		if p := attrs.Assoc(sx.MakeString("")); p != nil {
			if val, isString := sx.GetString(p.Cdr()); isString && val.GetValue() == api.ValueSyntaxHTML {
				sym = sz.SymLiteralHTML
				attrs = attrs.RemoveAssoc(sx.MakeString(""))
			}
		}
	}
	return sx.MakeList(sym, attrs, sx.MakeString(content))
}

func (cp *zmkP) parseLiteralMath() (res *sx.Pair, success bool) {
	inp := cp.inp
	// read 2nd formatting character
	if inp.Next() != '$' {
		return nil, false
	}
	inp.Next()
	pos := inp.Pos
	for {
		if inp.Ch == input.EOS {
			return nil, false
		}
		if inp.Ch == '$' && inp.Peek() == '$' {
			content := append([]byte{}, inp.Src[pos:inp.Pos]...)
			inp.Next()
			inp.Next()
			fn := sx.MakeList(sz.SymLiteralMath, cp.parseInlineAttributes(), sx.MakeString(string(content)))
			return fn, true
		}
		inp.Next()
	}
}

func (cp *zmkP) parseNdash() (res *sx.Pair, success bool) {
	inp := cp.inp
	if inp.Peek() != inp.Ch {
		return nil, false
	}
	inp.Next()
	inp.Next()
	return sx.MakeList(sz.SymText, sx.MakeString("\u2013")), true
}

func (cp *zmkP) parseEntity() (res *sx.Pair, success bool) {
	if text, ok := cp.inp.ScanEntity(); ok {
		return sx.MakeList(sz.SymText, sx.MakeString(text)), true
	}
	return nil, false
}

Deleted sz/zmk/post-processor.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
//-----------------------------------------------------------------------------

package zmk

import (
	"strings"

	"t73f.de/r/sx"
	"t73f.de/r/zsc/sz"
)

var symInVerse = sx.MakeSymbol("in-verse")
var symNoBlock = sx.MakeSymbol("no-block")

type postProcessor struct{}

func (pp *postProcessor) Visit(lst *sx.Pair, env *sx.Pair) sx.Object {
	if lst == nil {
		return nil
	}
	sym, isSym := sx.GetSymbol(lst.Car())
	if !isSym {
		panic(lst)
	}
	if fn, found := symMap[sym]; found {
		return fn(pp, lst, env)
	}
	return sx.Int64(0)
}

func (pp *postProcessor) visitPairList(lst *sx.Pair, env *sx.Pair) *sx.Pair {
	var pList sx.ListBuilder
	for node := lst; node != nil; node = node.Tail() {
		if elem := sz.Walk(pp, node.Head(), env); elem != nil {
			pList.Add(elem)
		}
	}
	return pList.List()
}

var symMap map[*sx.Symbol]func(*postProcessor, *sx.Pair, *sx.Pair) *sx.Pair

func init() {
	symMap = map[*sx.Symbol]func(*postProcessor, *sx.Pair, *sx.Pair) *sx.Pair{
		sz.SymBlock:           postProcessBlockList,
		sz.SymPara:            postProcessInlineList,
		sz.SymRegionBlock:     postProcessRegion,
		sz.SymRegionQuote:     postProcessRegion,
		sz.SymRegionVerse:     postProcessRegionVerse,
		sz.SymVerbatimComment: postProcessVerbatim,
		sz.SymVerbatimEval:    postProcessVerbatim,
		sz.SymVerbatimMath:    postProcessVerbatim,
		sz.SymVerbatimProg:    postProcessVerbatim,
		sz.SymVerbatimZettel:  postProcessVerbatim,
		sz.SymHeading:         postProcessHeading,
		sz.SymListOrdered:     postProcessItemList,
		sz.SymListUnordered:   postProcessItemList,
		sz.SymListQuote:       postProcessQuoteList,
		sz.SymDescription:     postProcessDescription,
		sz.SymTable:           postProcessTable,

		sz.SymInline:       postProcessInlineList,
		sz.SymText:         postProcessText,
		sz.SymSoft:         postProcessSoft,
		sz.SymEndnote:      postProcessEndnote,
		sz.SymMark:         postProcessMark,
		sz.SymLinkBased:    postProcessInlines4,
		sz.SymLinkBroken:   postProcessInlines4,
		sz.SymLinkExternal: postProcessInlines4,
		sz.SymLinkFound:    postProcessInlines4,
		sz.SymLinkHosted:   postProcessInlines4,
		sz.SymLinkInvalid:  postProcessInlines4,
		sz.SymLinkQuery:    postProcessInlines4,
		sz.SymLinkSelf:     postProcessInlines4,
		sz.SymLinkZettel:   postProcessInlines4,
		sz.SymEmbed:        postProcessInlines4,
		sz.SymCite:         postProcessInlines4,
		sz.SymFormatDelete: postProcessFormat,
		sz.SymFormatEmph:   postProcessFormat,
		sz.SymFormatInsert: postProcessFormat,
		sz.SymFormatMark:   postProcessFormat,
		sz.SymFormatQuote:  postProcessFormat,
		sz.SymFormatStrong: postProcessFormat,
		sz.SymFormatSpan:   postProcessFormat,
		sz.SymFormatSub:    postProcessFormat,
		sz.SymFormatSuper:  postProcessFormat,

		symSeparator: ignoreProcess,
	}
}

func ignoreProcess(*postProcessor, *sx.Pair, *sx.Pair) *sx.Pair { return nil }

func postProcessBlockList(pp *postProcessor, lst *sx.Pair, env *sx.Pair) *sx.Pair {
	result := pp.visitPairList(lst.Tail(), env)
	if result == nil {
		if noBlockPair := env.Assoc(symNoBlock); noBlockPair == nil || sx.IsTrue(noBlockPair.Cdr()) {
			return nil
		}
	}
	return result.Cons(lst.Car())
}

func postProcessInlineList(pp *postProcessor, lst *sx.Pair, env *sx.Pair) *sx.Pair {
	sym := lst.Car()
	if rest := pp.visitInlines(lst.Tail(), env); rest != nil {
		return rest.Cons(sym)
	}
	return nil
}

func postProcessRegion(pp *postProcessor, rn *sx.Pair, env *sx.Pair) *sx.Pair {
	return doPostProcessRegion(pp, rn, env, env)
}

func postProcessRegionVerse(pp *postProcessor, rn *sx.Pair, env *sx.Pair) *sx.Pair {
	return doPostProcessRegion(pp, rn, env.Cons(sx.Cons(symInVerse, nil)), env)
}

func doPostProcessRegion(pp *postProcessor, rn *sx.Pair, envBlock, envInline *sx.Pair) *sx.Pair {

	sym := rn.Car()
	next := rn.Tail()
	attrs := next.Car()
	next = next.Tail()
	blocks := pp.visitPairList(next.Head(), envBlock)
	text := pp.visitInlines(next.Tail(), envInline)
	if blocks == nil && text == nil {
		return nil
	}
	return text.Cons(blocks).Cons(attrs).Cons(sym)
}

func postProcessVerbatim(_ *postProcessor, verb *sx.Pair, _ *sx.Pair) *sx.Pair {
	if content, isString := sx.GetString(verb.Tail().Tail().Car()); isString && content.GetValue() != "" {
		return verb
	}
	return nil
}

func postProcessHeading(pp *postProcessor, hn *sx.Pair, env *sx.Pair) *sx.Pair {
	sym := hn.Car()
	next := hn.Tail()
	level := next.Car()
	next = next.Tail()
	attrs := next.Car()
	next = next.Tail()
	slug := next.Car()
	next = next.Tail()
	fragment := next.Car()
	if text := pp.visitInlines(next.Tail(), env); text != nil {
		return text.Cons(fragment).Cons(slug).Cons(attrs).Cons(level).Cons(sym)
	}
	return nil
}

func postProcessItemList(pp *postProcessor, ln *sx.Pair, env *sx.Pair) *sx.Pair {
	elems := pp.visitListElems(ln, env)
	if elems == nil {
		return nil
	}
	return elems.Cons(ln.Car())
}

func postProcessQuoteList(pp *postProcessor, ln *sx.Pair, env *sx.Pair) *sx.Pair {
	elems := pp.visitListElems(ln, env.Cons(sx.Cons(symNoBlock, nil)))

	// Collect multiple paragraph items into one item.

	var newElems sx.ListBuilder
	var newPara sx.ListBuilder

	addtoParagraph := func() {
		if !newPara.IsEmpty() {
			newElems.Add(sx.MakeList(sz.SymBlock, newPara.List().Cons(sz.SymPara)))
		}
	}
	for node := elems; node != nil; node = node.Tail() {
		item := node.Head()
		if !item.Car().IsEqual(sz.SymBlock) {
			continue
		}
		itemTail := item.Tail()
		if itemTail == nil || itemTail.Tail() != nil {
			addtoParagraph()
			newElems.Add(item)
			continue
		}
		if pn := itemTail.Head(); pn.Car().IsEqual(sz.SymPara) {
			if !newPara.IsEmpty() {
				newPara.Add(sx.Cons(sz.SymSoft, nil))
			}
			newPara.ExtendBang(pn.Tail())
			continue
		}
		addtoParagraph()
		newElems.Add(item)
	}
	addtoParagraph()
	return newElems.List().Cons(ln.Car())
}

func (pp *postProcessor) visitListElems(ln *sx.Pair, env *sx.Pair) *sx.Pair {
	var pList sx.ListBuilder
	for node := ln.Tail(); node != nil; node = node.Tail() {
		if elem := sz.Walk(pp, node.Head(), env); elem != nil {
			pList.Add(elem)
		}
	}
	return pList.List()
}

func postProcessDescription(pp *postProcessor, dl *sx.Pair, env *sx.Pair) *sx.Pair {
	var dList sx.ListBuilder
	isTerm := false
	for node := dl.Tail(); node != nil; node = node.Tail() {
		isTerm = !isTerm
		if isTerm {
			dList.Add(pp.visitInlines(node.Head(), env))
		} else {
			dList.Add(sz.Walk(pp, node.Head(), env))
		}
	}
	return dList.List().Cons(dl.Car())
}

func postProcessTable(pp *postProcessor, tbl *sx.Pair, env *sx.Pair) *sx.Pair {
	sym := tbl.Car()
	next := tbl.Tail()
	header := next.Head()
	if header != nil {
		// Already post-processed
		return tbl
	}
	rows, width := pp.visitRows(next.Tail(), env)
	if rows == nil {
		// Header and row are nil -> no table
		return nil
	}
	header, rows, align := splitTableHeader(rows, width)
	alignRow(header, align)
	for node := rows; node != nil; node = node.Tail() {
		alignRow(node.Head(), align)
	}
	return rows.Cons(header).Cons(sym)
}

func (pp *postProcessor) visitRows(rows *sx.Pair, env *sx.Pair) (*sx.Pair, int) {
	maxWidth := 0
	var pRows sx.ListBuilder
	for node := rows; node != nil; node = node.Tail() {
		row := node.Head()
		row, width := pp.visitCells(row, env)
		if maxWidth < width {
			maxWidth = width
		}
		pRows.Add(row)
	}
	return pRows.List(), maxWidth
}

func (pp *postProcessor) visitCells(cells *sx.Pair, env *sx.Pair) (*sx.Pair, int) {
	width := 0
	var pCells sx.ListBuilder
	for node := cells; node != nil; node = node.Tail() {
		cell := node.Head()
		ins := pp.visitInlines(cell.Tail(), env)
		newCell := ins.Cons(cell.Car())
		pCells.Add(newCell)
		width++
	}
	return pCells.List(), width
}

func splitTableHeader(rows *sx.Pair, width int) (header, realRows *sx.Pair, align []*sx.Symbol) {
	align = make([]*sx.Symbol, width)

	foundHeader := false
	cellCount := 0

	// assert: rows != nil (checked in postProcessTable)
	for node := rows.Head(); node != nil; node = node.Tail() {
		cellCount++
		cell := node.Head()
		cellTail := cell.Tail()
		if cellTail == nil {
			continue
		}

		// elem is first cell inline element
		elem := cellTail.Head()
		if elem.Car().IsEqual(sz.SymText) {
			if s, isString := sx.GetString(elem.Tail().Car()); isString && s.GetValue() != "" {
				str := s.GetValue()
				if str[0] == '=' {
					foundHeader = true
					elem.SetCdr(sx.Cons(sx.MakeString(str[1:]), nil))
				}
			}
		}

		// move to the last cell inline element
		for {
			next := cellTail.Tail()
			if next == nil {
				break
			}
			cellTail = next
		}

		elem = cellTail.Head()
		if elem.Car().IsEqual(sz.SymText) {
			if s, isString := sx.GetString(elem.Tail().Car()); isString && s.GetValue() != "" {
				str := s.GetValue()
				cellAlign := getCellAlignment(str[len(str)-1])
				if !cellAlign.IsEqual(sz.SymCell) {
					elem.SetCdr(sx.Cons(sx.MakeString(str[0:len(str)-1]), nil))
				}
				align[cellCount-1] = cellAlign
				cell.SetCar(cellAlign)
			}
		}
	}

	if !foundHeader {
		for i := 0; i < width; i++ {
			align[i] = sz.SymCell // Default alignment
		}
		return nil, rows, align
	}

	for i := 0; i < width; i++ {
		if align[i] == nil {
			align[i] = sz.SymCell // Default alignment
		}
	}
	return rows.Head(), rows.Tail(), align
}

func alignRow(row *sx.Pair, align []*sx.Symbol) {
	if row == nil {
		return
	}
	var lastCellNode *sx.Pair
	cellCount := 0
	for node := row; node != nil; node = node.Tail() {
		lastCellNode = node
		cell := node.Head()
		cell.SetCar(align[cellCount])
		cellCount++
		cellTail := cell.Tail()
		if cellTail == nil {
			continue
		}

		// elem is first cell inline element
		elem := cellTail.Head()
		if elem.Car().IsEqual(sz.SymText) {
			if s, isString := sx.GetString(elem.Tail().Car()); isString && s.GetValue() != "" {
				str := s.GetValue()
				cellAlign := getCellAlignment(str[0])
				if !cellAlign.IsEqual(sz.SymCell) {
					elem.SetCdr(sx.Cons(sx.MakeString(str[1:]), nil))
					cell.SetCar(cellAlign)
				}
			}
		}
	}

	for cellCount < len(align) {
		lastCellNode = lastCellNode.AppendBang(sx.Cons(align[cellCount], nil))
		cellCount++
	}
}

func getCellAlignment(ch byte) *sx.Symbol {
	switch ch {
	case ':':
		return sz.SymCellCenter
	case '<':
		return sz.SymCellLeft
	case '>':
		return sz.SymCellRight
	default:
		return sz.SymCell
	}
}

func (pp *postProcessor) visitInlines(lst *sx.Pair, env *sx.Pair) *sx.Pair {
	length := lst.Length()
	if length <= 0 {
		return nil
	}
	inVerse := env.Assoc(symInVerse) != nil
	vector := make([]*sx.Pair, 0, length)
	// 1st phase: process all childs, ignore ' ' / '\t' at start, and merge some elements
	for node := lst; node != nil; node = node.Tail() {
		elem := sz.Walk(pp, node.Head(), env)
		if elem == nil {
			continue
		}
		elemSym := elem.Car()
		if len(vector) == 0 {
			// If the 1st element is a TEXT, remove all ' ', '\t' at the beginning, if outside a verse block.
			if inVerse || !elemSym.IsEqual(sz.SymText) {
				vector = append(vector, elem)
				continue
			}

			elemTail := elem.Tail()
			elemText := elemTail.Car().(sx.String).GetValue()
			if elemText != "" && (elemText[0] == ' ' || elemText[0] == '\t') {
				for elemText != "" {
					if ch := elemText[0]; ch != ' ' && ch != '\t' {
						break
					}
					elemText = elemText[1:]
				}
				elemTail.SetCar(sx.MakeString(elemText))
			}
			if elemText != "" {
				vector = append(vector, elem)
			}
			continue
		}
		last := vector[len(vector)-1]
		lastSym := last.Car()

		if lastSym.IsEqual(sz.SymText) && elemSym.IsEqual(sz.SymText) {
			// Merge two TEXT elements into one
			lastText := last.Tail().Car().(sx.String).GetValue()
			elemText := elem.Tail().Car().(sx.String).GetValue()
			last.SetCdr(sx.Cons(sx.MakeString(lastText+elemText), sx.Nil()))
			continue
		}

		if lastSym.IsEqual(sz.SymText) && elemSym.IsEqual(sz.SymSoft) {
			// Merge (TEXT "... ") (SOFT) to (TEXT "...") (HARD)
			lastTail := last.Tail()
			if lastText := lastTail.Car().(sx.String).GetValue(); strings.HasSuffix(lastText, " ") {
				newText := removeTrailingSpaces(lastText)
				if newText == "" {
					vector[len(vector)-1] = sx.Cons(sz.SymHard, sx.Nil())
					continue
				}
				lastTail.SetCar(sx.MakeString(newText))
				elemSym = sz.SymHard
				elem.SetCar(elemSym)
			}
		}

		vector = append(vector, elem)
	}
	if len(vector) == 0 {
		return nil
	}

	// 2nd phase: remove (SOFT), (HARD) at the end, remove trailing spaces in (TEXT "...")
	lastPos := len(vector) - 1
	for lastPos >= 0 {
		elem := vector[lastPos]
		elemSym := elem.Car()
		if elemSym.IsEqual(sz.SymText) {
			elemTail := elem.Tail()
			elemText := elemTail.Car().(sx.String).GetValue()
			newText := removeTrailingSpaces(elemText)
			if newText != "" {
				elemTail.SetCar(sx.MakeString(newText))
				break
			}
			lastPos--
		} else if sz.IsBreakSym(elemSym) {
			lastPos--
		} else {
			break
		}
	}
	if lastPos < 0 {
		return nil
	}

	result := sx.Cons(vector[0], nil)
	curr := result
	for i := 1; i <= lastPos; i++ {
		curr = curr.AppendBang(vector[i])
	}
	return result
}

func removeTrailingSpaces(s string) string {
	for len(s) > 0 {
		if ch := s[len(s)-1]; ch != ' ' && ch != '\t' {
			return s
		}
		s = s[0 : len(s)-1]
	}
	return ""
}

func postProcessText(_ *postProcessor, txt *sx.Pair, _ *sx.Pair) *sx.Pair {
	if tail := txt.Tail(); tail != nil {
		if content, isString := sx.GetString(tail.Car()); isString && content.GetValue() != "" {
			return txt
		}
	}
	return nil
}

func postProcessSoft(_ *postProcessor, sn *sx.Pair, env *sx.Pair) *sx.Pair {
	if env.Assoc(symInVerse) == nil {
		return sn
	}
	return sx.Cons(sz.SymHard, nil)
}

func postProcessEndnote(pp *postProcessor, en *sx.Pair, env *sx.Pair) *sx.Pair {
	sym := en.Car()
	next := en.Tail()
	attrs := next.Car()
	if text := pp.visitInlines(next.Tail(), env); text != nil {
		return text.Cons(attrs).Cons(sym)
	}
	return sx.MakeList(sym, attrs)
}

func postProcessMark(pp *postProcessor, en *sx.Pair, env *sx.Pair) *sx.Pair {
	sym := en.Car()
	next := en.Tail()
	mark := next.Car()
	next = next.Tail()
	slug := next.Car()
	next = next.Tail()
	fragment := next.Car()
	text := pp.visitInlines(next.Tail(), env)
	return text.Cons(fragment).Cons(slug).Cons(mark).Cons(sym)
}

func postProcessInlines4(pp *postProcessor, ln *sx.Pair, env *sx.Pair) *sx.Pair {
	sym := ln.Car()
	next := ln.Tail()
	attrs := next.Car()
	next = next.Tail()
	val3 := next.Car()
	text := pp.visitInlines(next.Tail(), env)
	return text.Cons(val3).Cons(attrs).Cons(sym)
}

func postProcessFormat(pp *postProcessor, fn *sx.Pair, env *sx.Pair) *sx.Pair {
	symFormat := fn.Car()
	next := fn.Tail() // Attrs
	attrs := next.Car()
	next = next.Tail() // Possible inlines
	if next == nil {
		return fn
	}
	inlines := pp.visitInlines(next, env)
	return inlines.Cons(attrs).Cons(symFormat)
}

Deleted sz/zmk/ref.go.

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// -----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
// -----------------------------------------------------------------------------
package zmk

import (
	"net/url"
	"strings"

	"t73f.de/r/sx"
	"t73f.de/r/zsc/api"
	"t73f.de/r/zsc/sz"
)

// ParseReference parses a string and returns a reference.
func ParseReference(s string) *sx.Pair {
	if invalidReference(s) {
		return makePairRef(sz.SymRefStateInvalid, s)
	}
	if strings.HasPrefix(s, api.QueryPrefix) {
		return makePairRef(sz.SymRefStateQuery, s[len(api.QueryPrefix):])
	}
	if state, ok := localState(s); ok {
		if state.IsEqual(sz.SymRefStateBased) {
			s = s[1:]
		}
		_, err := url.Parse(s)
		if err == nil {
			return makePairRef(state, s)
		}
	}
	u, err := url.Parse(s)
	if err != nil {
		return makePairRef(sz.SymRefStateInvalid, s)
	}
	if !externalURL(u) {
		zid := api.ZettelID(u.Path)
		if zid.IsValid() {
			return makePairRef(sz.SymRefStateZettel, s)
		}
		if u.Path == "" && u.Fragment != "" {
			return makePairRef(sz.SymRefStateSelf, s)
		}
	}
	return makePairRef(sz.SymRefStateExternal, s)
}
func makePairRef(sym *sx.Symbol, val string) *sx.Pair {
	return sx.MakeList(sym, sx.MakeString(val))
}

func invalidReference(s string) bool { return s == "" || s == "00000000000000" }

func externalURL(u *url.URL) bool {
	return u.Scheme != "" || u.Opaque != "" || u.Host != "" || u.User != nil
}

func localState(path string) (*sx.Symbol, bool) {
	if len(path) > 0 && path[0] == '/' {
		if len(path) > 1 && path[1] == '/' {
			return sz.SymRefStateBased, true
		}
		return sz.SymRefStateHosted, true
	}
	if len(path) > 1 && path[0] == '.' {
		if len(path) > 2 && path[1] == '.' && path[2] == '/' {
			return sz.SymRefStateHosted, true
		}
		return sz.SymRefStateHosted, path[1] == '/'
	}
	return sz.SymRefStateInvalid, false
}

// ReferenceIsValid returns true if reference is valid
func ReferenceIsValid(ref *sx.Pair) bool {
	return !ref.Car().IsEqual(sz.SymRefStateInvalid)
}

// ReferenceIsZettel returns true if it is a reference to a local zettel.
func ReferenceIsZettel(ref *sx.Pair) bool {
	state := ref.Car()
	return state.IsEqual(sz.SymRefStateZettel) ||
		state.IsEqual(sz.SymRefStateSelf) ||
		state.IsEqual(sz.SymRefStateFound) ||
		state.IsEqual(sz.SymRefStateBroken)
}

// ReferenceIsLocal returns true if reference is local
func ReferenceIsLocal(ref *sx.Pair) bool {
	state := ref.Car()
	return state.IsEqual(sz.SymRefStateHosted) ||
		state.IsEqual(sz.SymRefStateBased)
}

// ReferenceIsExternal returns true if it is a reference to external material.
func ReferenceIsExternal(ref *sx.Pair) bool {
	return ref.Car().IsEqual(sz.SymRefStateExternal)
}

Deleted sz/zmk/ref_test.go.

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// -----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
// -----------------------------------------------------------------------------
package zmk_test

import (
	"testing"

	"t73f.de/r/zsc/sz/zmk"
)

func TestParseReference(t *testing.T) {
	t.Parallel()
	testcases := []struct {
		link string
		err  bool
		exp  string
	}{
		{"", true, ""},
		{"12345678901234", false, "(ZETTEL \"12345678901234\")"},
		{"123", false, "(EXTERNAL \"123\")"},
		{",://", true, ""},
	}

	for i, tc := range testcases {
		got := zmk.ParseReference(tc.link)
		gotIsValid := zmk.ReferenceIsValid(got)
		if gotIsValid == tc.err {
			t.Errorf(
				"TC=%d, expected parse error of %q: %v, but got %q", i, tc.link, tc.err, got)
		}
		if gotIsValid && got.String() != tc.exp {
			t.Errorf("TC=%d, Reference of %q is %q, but got %q", i, tc.link, tc.exp, got)
		}
	}
}

func TestReferenceIsZettelMaterial(t *testing.T) {
	t.Parallel()
	testcases := []struct {
		link       string
		isZettel   bool
		isExternal bool
		isLocal    bool
	}{
		{"", false, false, false},
		{"00000000000000", false, false, false},
		{"http://zettelstore.de/z/ast", false, true, false},
		{"12345678901234", true, false, false},
		{"12345678901234#local", true, false, false},
		{"http://12345678901234", false, true, false},
		{"http://zettelstore.de/z/12345678901234", false, true, false},
		{"http://zettelstore.de/12345678901234", false, true, false},
		{"/12345678901234", false, false, true},
		{"//12345678901234", false, false, true},
		{"./12345678901234", false, false, true},
		{"../12345678901234", false, false, true},
		{".../12345678901234", false, true, false},
	}

	for i, tc := range testcases {
		ref := zmk.ParseReference(tc.link)
		isZettel := zmk.ReferenceIsZettel(ref)
		if isZettel != tc.isZettel {
			t.Errorf(
				"TC=%d, Reference %q isZettel=%v expected, but got %v",
				i,
				tc.link,
				tc.isZettel,
				isZettel)
		}
		isLocal := zmk.ReferenceIsLocal(ref)
		if isLocal != tc.isLocal {
			t.Errorf(
				"TC=%d, Reference %q isLocal=%v expected, but got %v",
				i,
				tc.link,
				tc.isLocal, isLocal)
		}
		isExternal := zmk.ReferenceIsExternal(ref)
		if isExternal != tc.isExternal {
			t.Errorf(
				"TC=%d, Reference %q isExternal=%v expected, but got %v",
				i,
				tc.link,
				tc.isExternal,
				isExternal)
		}
	}
}

Deleted sz/zmk/zmk.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
//-----------------------------------------------------------------------------

// Package zmk provides a parser for zettelmarkup.
package zmk

import (
	"slices"
	"strings"
	"unicode"

	"t73f.de/r/sx"
	"t73f.de/r/zsc/input"
	"t73f.de/r/zsc/sz"
)

func ParseBlocks(inp *input.Input) *sx.Pair {
	parser := zmkP{inp: inp}

	var lastPara *sx.Pair
	var blkBuild sx.ListBuilder
	for inp.Ch != input.EOS {
		bn, cont := parser.parseBlock(lastPara)
		if bn != nil {
			blkBuild.Add(bn)
		}
		if !cont {
			if bn.Car().IsEqual(sz.SymPara) {
				lastPara = bn
			} else {
				lastPara = nil
			}
		}
	}
	if parser.nestingLevel != 0 {
		panic("Nesting level was not decremented")
	}

	bnl := blkBuild.List()
	var pp postProcessor
	if bs := pp.visitPairList(bnl, nil); bs != nil {
		return bs.Cons(sz.SymBlock)
	}
	return nil
}

func ParseInlines(inp *input.Input) *sx.Pair {
	parser := zmkP{inp: inp}
	var ins sx.Vector
	for inp.Ch != input.EOS {
		in := parser.parseInline()
		if in == nil {
			break
		}
		ins = append(ins, in)
	}

	inl := ins.MakeList().Cons(sz.SymInline)
	var pp postProcessor
	return sz.Walk(&pp, inl, nil)
}

type zmkP struct {
	inp          *input.Input // Input stream
	lists        []*sx.Pair   // Stack of lists
	lastRow      *sx.Pair     // Last row of table, or nil if not in table.
	descrl       *sx.Pair     // Current description list
	nestingLevel int          // Count nesting of block and inline elements

	inVerse bool // Currently in a vers region?
}

// runeModGrave is Unicode code point U+02CB (715) called "MODIFIER LETTER
// GRAVE ACCENT". On the iPad it is much more easier to type in this code point
// than U+0060 (96) "Grave accent" (aka backtick). Therefore, U+02CB will be
// considered equivalent to U+0060.
const runeModGrave = 'ˋ' // This is NOT '`'!

const maxNestingLevel = 50

// clearStacked removes all multi-line nodes from parser.
func (cp *zmkP) clearStacked() {
	cp.lists = nil
	cp.lastRow = nil
	cp.descrl = nil
}

type attrMap map[string]string

func (attrs attrMap) updateAttrs(key, val string) {
	if prevVal := attrs[key]; len(prevVal) > 0 {
		attrs[key] = prevVal + " " + val
	} else {
		attrs[key] = val
	}
}

func (attrs attrMap) asPairAssoc() *sx.Pair {
	names := make([]string, 0, len(attrs))
	for n := range attrs {
		names = append(names, n)
	}
	slices.Sort(names)
	var assoc *sx.Pair = nil
	for i := len(names) - 1; i >= 0; i-- {
		n := names[i]
		assoc = assoc.Cons(sx.Cons(sx.MakeString(n), sx.MakeString(attrs[n])))
	}
	return assoc
}

func (cp *zmkP) parseNormalAttribute(attrs attrMap) bool {
	inp := cp.inp
	posK := inp.Pos
	for isNameRune(inp.Ch) {
		inp.Next()
	}
	if posK == inp.Pos {
		return false
	}
	key := string(inp.Src[posK:inp.Pos])
	if inp.Ch != '=' {
		attrs[key] = ""
		return true
	}
	return cp.parseAttributeValue(key, attrs)
}

func (cp *zmkP) parseAttributeValue(key string, attrs attrMap) bool {
	inp := cp.inp
	if inp.Next() == '"' {
		return cp.parseQuotedAttributeValue(key, attrs)
	}
	posV := inp.Pos
	for {
		switch inp.Ch {
		case input.EOS:
			return false
		case '\n', '\r', ' ', ',', '}':
			attrs.updateAttrs(key, string(inp.Src[posV:inp.Pos]))
			return true
		}
		inp.Next()
	}
}

func (cp *zmkP) parseQuotedAttributeValue(key string, attrs attrMap) bool {
	inp := cp.inp
	inp.Next()
	var sb strings.Builder
	for {
		switch inp.Ch {
		case input.EOS:
			return false
		case '"':
			attrs.updateAttrs(key, sb.String())
			inp.Next()
			return true
		case '\\':
			switch inp.Next() {
			case input.EOS, '\n', '\r':
				return false
			}
			fallthrough
		default:
			sb.WriteRune(inp.Ch)
			inp.Next()
		}
	}

}

func (cp *zmkP) parseBlockAttributes() *sx.Pair {
	inp := cp.inp
	pos := inp.Pos
	for isNameRune(inp.Ch) {
		inp.Next()
	}
	if pos < inp.Pos {
		return attrMap{"": string(inp.Src[pos:inp.Pos])}.asPairAssoc()
	}

	// No immediate name: skip spaces
	cp.skipSpace()
	return cp.parseInlineAttributes()
}

func (cp *zmkP) parseInlineAttributes() *sx.Pair {
	inp := cp.inp
	pos := inp.Pos
	if attrs, success := cp.doParseAttributes(); success {
		return attrs
	}
	inp.SetPos(pos)
	return nil
}

// doParseAttributes reads attributes.
func (cp *zmkP) doParseAttributes() (res *sx.Pair, success bool) {
	inp := cp.inp
	if inp.Ch != '{' {
		return nil, false
	}
	inp.Next()
	a := attrMap{}
	if !cp.parseAttributeValues(a) {
		return nil, false
	}
	inp.Next()
	return a.asPairAssoc(), true
}

func (cp *zmkP) parseAttributeValues(a attrMap) bool {
	inp := cp.inp
	for {
		cp.skipSpaceLine()
		switch inp.Ch {
		case input.EOS:
			return false
		case '}':
			return true
		case '.':
			inp.Next()
			posC := inp.Pos
			for isNameRune(inp.Ch) {
				inp.Next()
			}
			if posC == inp.Pos {
				return false
			}
			a.updateAttrs("class", string(inp.Src[posC:inp.Pos]))
		case '=':
			delete(a, "")
			if !cp.parseAttributeValue("", a) {
				return false
			}
		default:
			if !cp.parseNormalAttribute(a) {
				return false
			}
		}

		switch inp.Ch {
		case '}':
			return true
		case '\n', '\r':
		case ' ', ',':
			inp.Next()
		default:
			return false
		}
	}
}

func (cp *zmkP) skipSpaceLine() {
	for inp := cp.inp; ; {
		switch inp.Ch {
		case ' ':
			inp.Next()
		case '\n', '\r':
			inp.EatEOL()
		default:
			return
		}
	}
}

func (cp *zmkP) skipSpace() {
	for inp := cp.inp; inp.Ch == ' '; {
		inp.Next()
	}
}

func isNameRune(ch rune) bool {
	return unicode.IsLetter(ch) || unicode.IsDigit(ch) || ch == '-' || ch == '_'
}

Deleted sz/zmk/zmk_fuzz_test.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2022-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2022-present Detlef Stern
//-----------------------------------------------------------------------------

package zmk_test

import (
	"testing"

	"t73f.de/r/zsc/input"
	"t73f.de/r/zsc/sz/zmk"
)

func FuzzParseBlocks(f *testing.F) {
	f.Fuzz(func(t *testing.T, src []byte) {
		t.Parallel()
		inp := input.NewInput(src)
		zmk.ParseBlocks(inp)
	})
}

Deleted sz/zmk/zmk_test.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2020-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2020-present Detlef Stern
//-----------------------------------------------------------------------------

// Package zmk_test provides some tests for the zettelmarkup parser.
package zmk_test

import (
	"fmt"
	"strings"
	"testing"

	"t73f.de/r/sx"
	"t73f.de/r/zsc/input"
	"t73f.de/r/zsc/sz"
	"t73f.de/r/zsc/sz/zmk"
)

type TestCase struct{ source, want string }
type TestCases []TestCase
type symbolMap map[string]*sx.Symbol

func replace(s string, sm symbolMap, tcs TestCases) TestCases {
	var sym string
	if len(sm) > 0 {
		sym = sm[s].GetValue()
	}
	var testCases TestCases
	for _, tc := range tcs {
		source := strings.ReplaceAll(tc.source, "$", s)
		want := tc.want
		if sym != "" {
			want = strings.ReplaceAll(want, "$%", sym)
		}
		want = strings.ReplaceAll(want, "$", s)
		testCases = append(testCases, TestCase{source, want})
	}
	return testCases
}

func checkTcs(t *testing.T, isBlock bool, tcs TestCases) {
	t.Helper()

	for tcn, tc := range tcs {
		t.Run(fmt.Sprintf("TC=%02d,src=%q", tcn, tc.source), func(st *testing.T) {
			st.Helper()
			ast := parseInput(tc.source, isBlock)
			got := ast.String()
			if tc.want != got {
				st.Errorf("\nwant=%q\n got=%q", tc.want, got)
			}
		})
	}
}
func parseInput(src string, asBlock bool) sx.Sequence {
	inp := input.NewInput([]byte(src))
	if asBlock {
		bl := zmk.ParseBlocks(inp)
		return bl
	}
	il := zmk.ParseInlines(inp)
	return il
}

func TestEOL(t *testing.T) {
	t.Parallel()
	for _, isBlock := range []bool{true, false} {
		checkTcs(t, isBlock, TestCases{
			{"", "()"},
			{"\n", "()"},
			{"\r", "()"},
			{"\r\n", "()"},
			{"\n\n", "()"},
		})
	}
}

func TestText(t *testing.T) {
	t.Parallel()
	checkTcs(t, false, TestCases{
		{"abcd", "(INLINE (TEXT \"abcd\"))"},
		{"ab cd", "(INLINE (TEXT \"ab cd\"))"},
		{"abcd ", "(INLINE (TEXT \"abcd\"))"},
		{" abcd", "(INLINE (TEXT \"abcd\"))"},
		{"\\", "(INLINE (TEXT \"\\\\\"))"},
		{"\\\n", "()"},
		{"\\\ndef", "(INLINE (HARD) (TEXT \"def\"))"},
		{"\\\r", "()"},
		{"\\\rdef", "(INLINE (HARD) (TEXT \"def\"))"},
		{"\\\r\n", "()"},
		{"\\\r\ndef", "(INLINE (HARD) (TEXT \"def\"))"},
		{"\\a", "(INLINE (TEXT \"a\"))"},
		{"\\aa", "(INLINE (TEXT \"aa\"))"},
		{"a\\a", "(INLINE (TEXT \"aa\"))"},
		{"\\+", "(INLINE (TEXT \"+\"))"},
		{"\\ ", "(INLINE (TEXT \"\u00a0\"))"},
		{"http://a, http://b", "(INLINE (TEXT \"http://a, http://b\"))"},
	})
}

func TestSpace(t *testing.T) {
	t.Parallel()
	for _, isBlock := range []bool{true, false} {
		checkTcs(t, isBlock, TestCases{
			{" ", "()"},
			{"\t", "()"},
			{"  ", "()"},
		})
	}
}

func TestSoftBreak(t *testing.T) {
	t.Parallel()
	checkTcs(t, false, TestCases{
		{"x\ny", "(INLINE (TEXT \"x\") (SOFT) (TEXT \"y\"))"},
		{"z\n", "(INLINE (TEXT \"z\"))"},
		{" \n ", "()"},
		{" \n", "()"},
	})
}

func TestHardBreak(t *testing.T) {
	t.Parallel()
	checkTcs(t, false, TestCases{
		{"x  \ny", "(INLINE (TEXT \"x\") (HARD) (TEXT \"y\"))"},
		{"z  \n", "(INLINE (TEXT \"z\"))"},
		{"   \n ", "()"},
		{"   \n", "()"},
	})
}

func TestLink(t *testing.T) {
	t.Parallel()
	checkTcs(t, false, TestCases{
		{"[", "(INLINE (TEXT \"[\"))"},
		{"[[", "(INLINE (TEXT \"[[\"))"},
		{"[[|", "(INLINE (TEXT \"[[|\"))"},
		{"[[]", "(INLINE (TEXT \"[[]\"))"},
		{"[[|]", "(INLINE (TEXT \"[[|]\"))"},
		{"[[]]", "(INLINE (TEXT \"[[]]\"))"},
		{"[[|]]", "(INLINE (TEXT \"[[|]]\"))"},
		{"[[ ]]", "(INLINE (TEXT \"[[ ]]\"))"},
		{"[[\n]]", "(INLINE (TEXT \"[[\") (SOFT) (TEXT \"]]\"))"},
		{"[[ a]]", "(INLINE (LINK-EXTERNAL () \"a\"))"},
		{"[[a ]]", "(INLINE (TEXT \"[[a ]]\"))"},
		{"[[a\n]]", "(INLINE (TEXT \"[[a\") (SOFT) (TEXT \"]]\"))"},
		{"[[a]]", "(INLINE (LINK-EXTERNAL () \"a\"))"},
		{"[[12345678901234]]", "(INLINE (LINK-ZETTEL () \"12345678901234\"))"},
		{"[[a]", "(INLINE (TEXT \"[[a]\"))"},
		{"[[|a]]", "(INLINE (TEXT \"[[|a]]\"))"},
		{"[[b|]]", "(INLINE (TEXT \"[[b|]]\"))"},
		{"[[b|a]]", "(INLINE (LINK-EXTERNAL () \"a\" (TEXT \"b\")))"},
		{"[[b| a]]", "(INLINE (LINK-EXTERNAL () \"a\" (TEXT \"b\")))"},
		{"[[b%c|a]]", "(INLINE (LINK-EXTERNAL () \"a\" (TEXT \"b%c\")))"},
		{"[[b%%c|a]]", "(INLINE (TEXT \"[[b\") (LITERAL-COMMENT () \"c|a]]\"))"},
		{"[[b|a]", "(INLINE (TEXT \"[[b|a]\"))"},
		{"[[b\nc|a]]", "(INLINE (LINK-EXTERNAL () \"a\" (TEXT \"b\") (SOFT) (TEXT \"c\")))"},
		{"[[b c|a#n]]", "(INLINE (LINK-EXTERNAL () \"a#n\" (TEXT \"b c\")))"},
		{"[[a]]go", "(INLINE (LINK-EXTERNAL () \"a\") (TEXT \"go\"))"},
		{"[[b|a]]{go}", "(INLINE (LINK-EXTERNAL ((\"go\" . \"\")) \"a\" (TEXT \"b\")))"},
		{"[[[[a]]|b]]", "(INLINE (TEXT \"[[\") (LINK-EXTERNAL () \"a\") (TEXT \"|b]]\"))"},
		{"[[a[b]c|d]]", "(INLINE (LINK-EXTERNAL () \"d\" (TEXT \"a[b]c\")))"},
		{"[[[b]c|d]]", "(INLINE (TEXT \"[\") (LINK-EXTERNAL () \"d\" (TEXT \"b]c\")))"},
		{"[[a[]c|d]]", "(INLINE (LINK-EXTERNAL () \"d\" (TEXT \"a[]c\")))"},
		{"[[a[b]|d]]", "(INLINE (LINK-EXTERNAL () \"d\" (TEXT \"a[b]\")))"},
		{"[[\\|]]", "(INLINE (LINK-EXTERNAL () \"\\\\|\"))"},
		{"[[\\||a]]", "(INLINE (LINK-EXTERNAL () \"a\" (TEXT \"|\")))"},
		{"[[b\\||a]]", "(INLINE (LINK-EXTERNAL () \"a\" (TEXT \"b|\")))"},
		{"[[b\\|c|a]]", "(INLINE (LINK-EXTERNAL () \"a\" (TEXT \"b|c\")))"},
		{"[[\\]]]", "(INLINE (LINK-EXTERNAL () \"\\\\]\"))"},
		{"[[\\]|a]]", "(INLINE (LINK-EXTERNAL () \"a\" (TEXT \"]\")))"},
		{"[[b\\]|a]]", "(INLINE (LINK-EXTERNAL () \"a\" (TEXT \"b]\")))"},
		{"[[\\]\\||a]]", "(INLINE (LINK-EXTERNAL () \"a\" (TEXT \"]|\")))"},
		{"[[http://a]]", "(INLINE (LINK-EXTERNAL () \"http://a\"))"},
		{"[[http://a|http://a]]", "(INLINE (LINK-EXTERNAL () \"http://a\" (TEXT \"http://a\")))"},
		{"[[[[a]]]]", "(INLINE (TEXT \"[[\") (LINK-EXTERNAL () \"a\") (TEXT \"]]\"))"},
		{"[[query:title]]", "(INLINE (LINK-QUERY () \"title\"))"},
		{"[[query:title syntax]]", "(INLINE (LINK-QUERY () \"title syntax\"))"},
		{"[[query:title | action]]", "(INLINE (LINK-QUERY () \"title | action\"))"},
		{"[[Text|query:title]]", "(INLINE (LINK-QUERY () \"title\" (TEXT \"Text\")))"},
		{"[[Text|query:title syntax]]", "(INLINE (LINK-QUERY () \"title syntax\" (TEXT \"Text\")))"},
		{"[[Text|query:title | action]]", "(INLINE (LINK-QUERY () \"title | action\" (TEXT \"Text\")))"},
	})
}

func TestEmbed(t *testing.T) {
	t.Parallel()
	checkTcs(t, false, TestCases{
		{"{", "(INLINE (TEXT \"{\"))"},
		{"{{", "(INLINE (TEXT \"{{\"))"},
		{"{{|", "(INLINE (TEXT \"{{|\"))"},
		{"{{}", "(INLINE (TEXT \"{{}\"))"},
		{"{{|}", "(INLINE (TEXT \"{{|}\"))"},
		{"{{}}", "(INLINE (TEXT \"{{}}\"))"},
		{"{{|}}", "(INLINE (TEXT \"{{|}}\"))"},
		{"{{ }}", "(INLINE (TEXT \"{{ }}\"))"},
		{"{{\n}}", "(INLINE (TEXT \"{{\") (SOFT) (TEXT \"}}\"))"},
		{"{{a }}", "(INLINE (TEXT \"{{a }}\"))"},
		{"{{a\n}}", "(INLINE (TEXT \"{{a\") (SOFT) (TEXT \"}}\"))"},
		{"{{a}}", "(INLINE (EMBED () \"a\"))"},
		{"{{12345678901234}}", "(INLINE (EMBED () \"12345678901234\"))"},
		{"{{ a}}", "(INLINE (EMBED () \"a\"))"},
		{"{{a}", "(INLINE (TEXT \"{{a}\"))"},
		{"{{|a}}", "(INLINE (TEXT \"{{|a}}\"))"},
		{"{{b|}}", "(INLINE (TEXT \"{{b|}}\"))"},
		{"{{b|a}}", "(INLINE (EMBED () \"a\" (TEXT \"b\")))"},
		{"{{b| a}}", "(INLINE (EMBED () \"a\" (TEXT \"b\")))"},
		{"{{b|a}", "(INLINE (TEXT \"{{b|a}\"))"},
		{"{{b\nc|a}}", "(INLINE (EMBED () \"a\" (TEXT \"b\") (SOFT) (TEXT \"c\")))"},
		{"{{b c|a#n}}", "(INLINE (EMBED () \"a#n\" (TEXT \"b c\")))"},
		{"{{a}}{go}", "(INLINE (EMBED ((\"go\" . \"\")) \"a\"))"},
		{"{{{{a}}|b}}", "(INLINE (TEXT \"{{\") (EMBED () \"a\") (TEXT \"|b}}\"))"},
		{"{{\\|}}", "(INLINE (EMBED () \"\\\\|\"))"},
		{"{{\\||a}}", "(INLINE (EMBED () \"a\" (TEXT \"|\")))"},
		{"{{b\\||a}}", "(INLINE (EMBED () \"a\" (TEXT \"b|\")))"},
		{"{{b\\|c|a}}", "(INLINE (EMBED () \"a\" (TEXT \"b|c\")))"},
		{"{{\\}}}", "(INLINE (EMBED () \"\\\\}\"))"},
		{"{{\\}|a}}", "(INLINE (EMBED () \"a\" (TEXT \"}\")))"},
		{"{{b\\}|a}}", "(INLINE (EMBED () \"a\" (TEXT \"b}\")))"},
		{"{{\\}\\||a}}", "(INLINE (EMBED () \"a\" (TEXT \"}|\")))"},
		{"{{http://a}}", "(INLINE (EMBED () \"http://a\"))"},
		{"{{http://a|http://a}}", "(INLINE (EMBED () \"http://a\" (TEXT \"http://a\")))"},
		{"{{{{a}}}}", "(INLINE (TEXT \"{{\") (EMBED () \"a\") (TEXT \"}}\"))"},
	})
}

func TestCite(t *testing.T) {
	t.Parallel()
	checkTcs(t, false, TestCases{
		{"[@", "(INLINE (TEXT \"[@\"))"},
		{"[@]", "(INLINE (TEXT \"[@]\"))"},
		{"[@a]", "(INLINE (CITE () \"a\"))"},
		{"[@ a]", "(INLINE (TEXT \"[@ a]\"))"},
		{"[@a ]", "(INLINE (CITE () \"a\"))"},
		{"[@a\n]", "(INLINE (CITE () \"a\"))"},
		{"[@a\nx]", "(INLINE (CITE () \"a\" (SOFT) (TEXT \"x\")))"},
		{"[@a\n\n]", "(INLINE (TEXT \"[@a\") (SOFT) (SOFT) (TEXT \"]\"))"},
		{"[@a,\n]", "(INLINE (CITE () \"a\"))"},
		{"[@a,n]", "(INLINE (CITE () \"a\" (TEXT \"n\")))"},
		{"[@a| n]", "(INLINE (CITE () \"a\" (TEXT \"n\")))"},
		{"[@a|n ]", "(INLINE (CITE () \"a\" (TEXT \"n\")))"},
		{"[@a,[@b]]", "(INLINE (CITE () \"a\" (CITE () \"b\")))"},
		{"[@a]{color=green}", "(INLINE (CITE ((\"color\" . \"green\")) \"a\"))"},
	})
	checkTcs(t, true, TestCases{
		{"[@a\n\n]", "(BLOCK (PARA (TEXT \"[@a\")) (PARA (TEXT \"]\")))"},
	})
}

func TestEndnote(t *testing.T) {
	t.Parallel()
	checkTcs(t, false, TestCases{
		{"[^", "(INLINE (TEXT \"[^\"))"},
		{"[^]", "(INLINE (ENDNOTE ()))"},
		{"[^abc]", "(INLINE (ENDNOTE () (TEXT \"abc\")))"},
		{"[^abc ]", "(INLINE (ENDNOTE () (TEXT \"abc\")))"},
		{"[^abc\ndef]", "(INLINE (ENDNOTE () (TEXT \"abc\") (SOFT) (TEXT \"def\")))"},
		{"[^abc\n\ndef]", "(INLINE (TEXT \"[^abc\") (SOFT) (SOFT) (TEXT \"def]\"))"},
		{"[^abc[^def]]", "(INLINE (ENDNOTE () (TEXT \"abc\") (ENDNOTE () (TEXT \"def\"))))"},
		{"[^abc]{-}", "(INLINE (ENDNOTE ((\"-\" . \"\")) (TEXT \"abc\")))"},
	})
	checkTcs(t, true, TestCases{
		{"[^abc\n\ndef]", "(BLOCK (PARA (TEXT \"[^abc\")) (PARA (TEXT \"def]\")))"},
	})
}

func TestMark(t *testing.T) {
	t.Parallel()
	checkTcs(t, false, TestCases{
		{"[!", "(INLINE (TEXT \"[!\"))"},
		{"[!\n", "(INLINE (TEXT \"[!\"))"},
		{"[!]", "(INLINE (MARK \"\" \"\" \"\"))"},
		{"[!][!]", "(INLINE (MARK \"\" \"\" \"\") (MARK \"\" \"\" \"\"))"},
		{"[! ]", "(INLINE (TEXT \"[! ]\"))"},
		{"[!a]", "(INLINE (MARK \"a\" \"\" \"\"))"},
		{"[!a][!a]", "(INLINE (MARK \"a\" \"\" \"\") (MARK \"a\" \"\" \"\"))"},
		{"[!a ]", "(INLINE (TEXT \"[!a ]\"))"},
		{"[!a_]", "(INLINE (MARK \"a_\" \"\" \"\"))"},
		{"[!a_][!a]", "(INLINE (MARK \"a_\" \"\" \"\") (MARK \"a\" \"\" \"\"))"},
		{"[!a-b]", "(INLINE (MARK \"a-b\" \"\" \"\"))"},
		{"[!a|b]", "(INLINE (MARK \"a\" \"\" \"\" (TEXT \"b\")))"},
		{"[!a|]", "(INLINE (MARK \"a\" \"\" \"\"))"},
		{"[!|b]", "(INLINE (MARK \"\" \"\" \"\" (TEXT \"b\")))"},
		{"[!|b ]", "(INLINE (MARK \"\" \"\" \"\" (TEXT \"b\")))"},
		{"[!|b c]", "(INLINE (MARK \"\" \"\" \"\" (TEXT \"b c\")))"},
	})
}

func TestComment(t *testing.T) {
	t.Parallel()
	checkTcs(t, false, TestCases{
		{"%", "(INLINE (TEXT \"%\"))"},
		{"%%", "(INLINE (LITERAL-COMMENT () \"\"))"},
		{"%\n", "(INLINE (TEXT \"%\"))"},
		{"%%\n", "(INLINE (LITERAL-COMMENT () \"\"))"},
		{"%%a", "(INLINE (LITERAL-COMMENT () \"a\"))"},
		{"%%%a", "(INLINE (LITERAL-COMMENT () \"a\"))"},
		{"%% a", "(INLINE (LITERAL-COMMENT () \"a\"))"},
		{"%%%  a", "(INLINE (LITERAL-COMMENT () \"a\"))"},
		{"%% % a", "(INLINE (LITERAL-COMMENT () \"% a\"))"},
		{"%%a", "(INLINE (LITERAL-COMMENT () \"a\"))"},
		{"a%%b", "(INLINE (TEXT \"a\") (LITERAL-COMMENT () \"b\"))"},
		{"a %%b", "(INLINE (TEXT \"a \") (LITERAL-COMMENT () \"b\"))"},
		{" %%b", "(INLINE (LITERAL-COMMENT () \"b\"))"},
		{"%%b ", "(INLINE (LITERAL-COMMENT () \"b \"))"},
		{"100%", "(INLINE (TEXT \"100%\"))"},
		{"%%{=}a", "(INLINE (LITERAL-COMMENT ((\"\" . \"\")) \"a\"))"},
	})
}

func TestFormat(t *testing.T) {
	symMap := symbolMap{
		"_": sz.SymFormatEmph,
		"*": sz.SymFormatStrong,
		">": sz.SymFormatInsert,
		"~": sz.SymFormatDelete,
		"^": sz.SymFormatSuper,
		",": sz.SymFormatSub,
		"#": sz.SymFormatMark,
		":": sz.SymFormatSpan,
	}
	t.Parallel()
	// Not for Insert / '>', because collision with quoted list
	// Not for Quote / '"', because escaped representation.
	for _, ch := range []string{"_", "*", "~", "^", ",", "#", ":"} {
		checkTcs(t, false, replace(ch, symMap, TestCases{
			{"$", "(INLINE (TEXT \"$\"))"},
			{"$$", "(INLINE (TEXT \"$$\"))"},
			{"$$$", "(INLINE (TEXT \"$$$\"))"},
			{"$$$$", "(INLINE ($% ()))"},
		}))
	}
	// Not for Quote / '"', because escaped representation.
	for _, ch := range []string{"_", "*", ">", "~", "^", ",", "#", ":"} {
		checkTcs(t, false, replace(ch, symMap, TestCases{
			{"$$a$$", "(INLINE ($% () (TEXT \"a\")))"},
			{"$$a$$$", "(INLINE ($% () (TEXT \"a\")) (TEXT \"$\"))"},
			{"$$$a$$", "(INLINE ($% () (TEXT \"$a\")))"},
			{"$$$a$$$", "(INLINE ($% () (TEXT \"$a\")) (TEXT \"$\"))"},
			{"$\\$", "(INLINE (TEXT \"$$\"))"},
			{"$\\$$", "(INLINE (TEXT \"$$$\"))"},
			{"$$\\$", "(INLINE (TEXT \"$$$\"))"},
			{"$$a\\$$", "(INLINE (TEXT \"$$a$$\"))"},
			{"$$a$\\$", "(INLINE (TEXT \"$$a$$\"))"},
			{"$$a\\$$$", "(INLINE ($% () (TEXT \"a$\")))"},
			{"$$a\na$$", "(INLINE ($% () (TEXT \"a\") (SOFT) (TEXT \"a\")))"},
			{"$$a\n\na$$", "(INLINE (TEXT \"$$a\") (SOFT) (SOFT) (TEXT \"a$$\"))"},
			{"$$a$${go}", "(INLINE ($% ((\"go\" . \"\")) (TEXT \"a\")))"},
		}))
		checkTcs(t, true, replace(ch, symMap, TestCases{
			{"$$a\n\na$$", "(BLOCK (PARA (TEXT \"$$a\")) (PARA (TEXT \"a$$\")))"},
		}))
	}
	checkTcs(t, false, replace(`"`, symbolMap{`"`: sz.SymFormatQuote}, TestCases{
		{"$", "(INLINE (TEXT \"\\\"\"))"},
		{"$$", "(INLINE (TEXT \"\\\"\\\"\"))"},
		{"$$$", "(INLINE (TEXT \"\\\"\\\"\\\"\"))"},
		{"$$$$", "(INLINE ($% ()))"},

		{"$$a$$", "(INLINE ($% () (TEXT \"a\")))"},
		{"$$a$$$", "(INLINE ($% () (TEXT \"a\")) (TEXT \"\\\"\"))"},
		{"$$$a$$", "(INLINE ($% () (TEXT \"\\\"a\")))"},
		{"$$$a$$$", "(INLINE ($% () (TEXT \"\\\"a\")) (TEXT \"\\\"\"))"},
		{"$\\$", "(INLINE (TEXT \"\\\"\\\"\"))"},
		{"$\\$$", "(INLINE (TEXT \"\\\"\\\"\\\"\"))"},
		{"$$\\$", "(INLINE (TEXT \"\\\"\\\"\\\"\"))"},
		{"$$a\\$$", "(INLINE (TEXT \"\\\"\\\"a\\\"\\\"\"))"},
		{"$$a$\\$", "(INLINE (TEXT \"\\\"\\\"a\\\"\\\"\"))"},
		{"$$a\\$$$", "(INLINE ($% () (TEXT \"a\\\"\")))"},
		{"$$a\na$$", "(INLINE ($% () (TEXT \"a\") (SOFT) (TEXT \"a\")))"},
		{"$$a\n\na$$", "(INLINE (TEXT \"\\\"\\\"a\") (SOFT) (SOFT) (TEXT \"a\\\"\\\"\"))"},
		{"$$a$${go}", "(INLINE ($% ((\"go\" . \"\")) (TEXT \"a\")))"},
	}))
	checkTcs(t, false, TestCases{
		{"__****__", "(INLINE (FORMAT-EMPH () (FORMAT-STRONG ())))"},
		{"__**a**__", "(INLINE (FORMAT-EMPH () (FORMAT-STRONG () (TEXT \"a\"))))"},
		{"__**__**", "(INLINE (TEXT \"__\") (FORMAT-STRONG () (TEXT \"__\")))"},
	})
}

func TestLiteral(t *testing.T) {
	symMap := symbolMap{
		"@": sz.SymLiteralZettel,
		"`": sz.SymLiteralProg,
		"'": sz.SymLiteralInput,
		"=": sz.SymLiteralOutput,
	}
	t.Parallel()
	for _, ch := range []string{"@", "`", "'", "="} {
		checkTcs(t, false, replace(ch, symMap, TestCases{
			{"$", "(INLINE (TEXT \"$\"))"},
			{"$$", "(INLINE (TEXT \"$$\"))"},
			{"$$$", "(INLINE (TEXT \"$$$\"))"},
			{"$$$$", "(INLINE ($% () \"\"))"},
			{"$$a$$", "(INLINE ($% () \"a\"))"},
			{"$$a$$$", "(INLINE ($% () \"a\") (TEXT \"$\"))"},
			{"$$$a$$", "(INLINE ($% () \"$a\"))"},
			{"$$$a$$$", "(INLINE ($% () \"$a\") (TEXT \"$\"))"},
			{"$\\$", "(INLINE (TEXT \"$$\"))"},
			{"$\\$$", "(INLINE (TEXT \"$$$\"))"},
			{"$$\\$", "(INLINE (TEXT \"$$$\"))"},
			{"$$a\\$$", "(INLINE (TEXT \"$$a$$\"))"},
			{"$$a$\\$", "(INLINE (TEXT \"$$a$$\"))"},
			{"$$a\\$$$", "(INLINE ($% () \"a$\"))"},
			{"$$a$${go}", "(INLINE ($% ((\"go\" . \"\")) \"a\"))"},
		}))
	}
	checkTcs(t, false, TestCases{
		{"''````''", "(INLINE (LITERAL-INPUT () \"````\"))"},
		{"''``a``''", "(INLINE (LITERAL-INPUT () \"``a``\"))"},
		{"''``''``", "(INLINE (LITERAL-INPUT () \"``\") (TEXT \"``\"))"},
		{"''\\'''", "(INLINE (LITERAL-INPUT () \"'\"))"},
	})
	checkTcs(t, false, TestCases{
		{"@@HTML@@{=html}", "(INLINE (LITERAL-HTML () \"HTML\"))"},
		{"@@HTML@@{=html lang=en}", "(INLINE (LITERAL-HTML ((\"lang\" . \"en\")) \"HTML\"))"},
		{"@@HTML@@{=html,lang=en}", "(INLINE (LITERAL-HTML ((\"lang\" . \"en\")) \"HTML\"))"},
	})
}

func TestLiteralMath(t *testing.T) {
	t.Parallel()
	checkTcs(t, false, TestCases{
		{"$", "(INLINE (TEXT \"$\"))"},
		{"$$", "(INLINE (TEXT \"$$\"))"},
		{"$$$", "(INLINE (TEXT \"$$$\"))"},
		{"$$$$", "(INLINE (LITERAL-MATH () \"\"))"},
		{"$$a$$", "(INLINE (LITERAL-MATH () \"a\"))"},
		{"$$a$$$", "(INLINE (LITERAL-MATH () \"a\") (TEXT \"$\"))"},
		{"$$$a$$", "(INLINE (LITERAL-MATH () \"$a\"))"},
		{"$$$a$$$", "(INLINE (LITERAL-MATH () \"$a\") (TEXT \"$\"))"},
		{`$\$`, "(INLINE (TEXT \"$$\"))"},
		{`$\$$`, "(INLINE (TEXT \"$$$\"))"},
		{`$$\$`, "(INLINE (TEXT \"$$$\"))"},
		{`$$a\$$`, "(INLINE (LITERAL-MATH () \"a\\\\\"))"},
		{`$$a$\$`, "(INLINE (TEXT \"$$a$$\"))"},
		{`$$a\$$$`, "(INLINE (LITERAL-MATH () \"a\\\\\") (TEXT \"$\"))"},
		{"$$a$${go}", "(INLINE (LITERAL-MATH ((\"go\" . \"\")) \"a\"))"},
	})
}

func TestMixFormatCode(t *testing.T) {
	t.Parallel()
	checkTcs(t, false, TestCases{
		{"__abc__\n**def**", "(INLINE (FORMAT-EMPH () (TEXT \"abc\")) (SOFT) (FORMAT-STRONG () (TEXT \"def\")))"},
		{"''abc''\n==def==", "(INLINE (LITERAL-INPUT () \"abc\") (SOFT) (LITERAL-OUTPUT () \"def\"))"},
		{"__abc__\n==def==", "(INLINE (FORMAT-EMPH () (TEXT \"abc\")) (SOFT) (LITERAL-OUTPUT () \"def\"))"},
		{"__abc__\n``def``", "(INLINE (FORMAT-EMPH () (TEXT \"abc\")) (SOFT) (LITERAL-CODE () \"def\"))"},
		{
			"\"\"ghi\"\"\n::abc::\n``def``\n",
			"(INLINE (FORMAT-QUOTE () (TEXT \"ghi\")) (SOFT) (FORMAT-SPAN () (TEXT \"abc\")) (SOFT) (LITERAL-CODE () \"def\"))",
		},
	})
}

func TestNDash(t *testing.T) {
	t.Parallel()
	checkTcs(t, false, TestCases{
		{"--", "(INLINE (TEXT \"\u2013\"))"},
		{"a--b", "(INLINE (TEXT \"a\u2013b\"))"},
	})
}

func TestEntity(t *testing.T) {
	t.Parallel()
	checkTcs(t, false, TestCases{
		{"&", "(INLINE (TEXT \"&\"))"},
		{"&;", "(INLINE (TEXT \"&;\"))"},
		{"&#;", "(INLINE (TEXT \"&#;\"))"},
		{"&#1a;", "(INLINE (TEXT \"&#1a;\"))"},
		{"&#x;", "(INLINE (TEXT \"&#x;\"))"},
		{"&#x0z;", "(INLINE (TEXT \"&#x0z;\"))"},
		{"&1;", "(INLINE (TEXT \"&1;\"))"},
		{"&#9;", "(INLINE (TEXT \"&#9;\"))"}, // Numeric entities below space are not allowed.
		{"&#x1f;", "(INLINE (TEXT \"&#x1f;\"))"},

		// Good cases
		{"&lt;", "(INLINE (TEXT \"<\"))"},
		{"&#48;", "(INLINE (TEXT \"0\"))"},
		{"&#x4A;", "(INLINE (TEXT \"J\"))"},
		{"&#X4a;", "(INLINE (TEXT \"J\"))"},
		{"&hellip;", "(INLINE (TEXT \"\u2026\"))"},
		{"&nbsp;", "(INLINE (TEXT \"\u00a0\"))"},
		{"E: &amp;,&#63;;&#x63;.", "(INLINE (TEXT \"E: &,?;c.\"))"},
	})
}

func TestVerbatimZettel(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"@@@\n@@@", "()"},
		{"@@@\nabc\n@@@", "(BLOCK (VERBATIM-ZETTEL () \"abc\"))"},
		{"@@@@def\nabc\n@@@@", "(BLOCK (VERBATIM-ZETTEL ((\"\" . \"def\")) \"abc\"))"},
	})
}

func TestVerbatimCode(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"```\n```", "()"},
		{"```\nabc\n```", "(BLOCK (VERBATIM-CODE () \"abc\"))"},
		{"```\nabc\n````", "(BLOCK (VERBATIM-CODE () \"abc\"))"},
		{"````\nabc\n````", "(BLOCK (VERBATIM-CODE () \"abc\"))"},
		{"````\nabc\n```\n````", "(BLOCK (VERBATIM-CODE () \"abc\\n```\"))"},
		{"````go\nabc\n````", "(BLOCK (VERBATIM-CODE ((\"\" . \"go\")) \"abc\"))"},
	})
}

func TestVerbatimEval(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"~~~\n~~~", "()"},
		{"~~~\nabc\n~~~", "(BLOCK (VERBATIM-EVAL () \"abc\"))"},
		{"~~~\nabc\n~~~~", "(BLOCK (VERBATIM-EVAL () \"abc\"))"},
		{"~~~~\nabc\n~~~~", "(BLOCK (VERBATIM-EVAL () \"abc\"))"},
		{"~~~~\nabc\n~~~\n~~~~", "(BLOCK (VERBATIM-EVAL () \"abc\\n~~~\"))"},
		{"~~~~go\nabc\n~~~~", "(BLOCK (VERBATIM-EVAL ((\"\" . \"go\")) \"abc\"))"},
	})
}

func TestVerbatimMath(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"$$$\n$$$", "()"},
		{"$$$\nabc\n$$$", "(BLOCK (VERBATIM-MATH () \"abc\"))"},
		{"$$$\nabc\n$$$$", "(BLOCK (VERBATIM-MATH () \"abc\"))"},
		{"$$$$\nabc\n$$$$", "(BLOCK (VERBATIM-MATH () \"abc\"))"},
		{"$$$$\nabc\n$$$\n$$$$", "(BLOCK (VERBATIM-MATH () \"abc\\n$$$\"))"},
		{"$$$$go\nabc\n$$$$", "(BLOCK (VERBATIM-MATH ((\"\" . \"go\")) \"abc\"))"},
	})
}

func TestVerbatimComment(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"%%%\n%%%", "()"},
		{"%%%\nabc\n%%%", "(BLOCK (VERBATIM-COMMENT () \"abc\"))"},
		{"%%%%go\nabc\n%%%%", "(BLOCK (VERBATIM-COMMENT ((\"\" . \"go\")) \"abc\"))"},
	})
}

func TestPara(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"a\n\nb", "(BLOCK (PARA (TEXT \"a\")) (PARA (TEXT \"b\")))"},
		{"a\n \nb", "(BLOCK (PARA (TEXT \"a\") (SOFT) (HARD) (TEXT \"b\")))"},
	})
}

func TestSpanRegion(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{":::\n:::", "()"},
		{":::\nabc\n:::", "(BLOCK (REGION-BLOCK () ((PARA (TEXT \"abc\")))))"},
		{":::\nabc\n::::", "(BLOCK (REGION-BLOCK () ((PARA (TEXT \"abc\")))))"},
		{"::::\nabc\n::::", "(BLOCK (REGION-BLOCK () ((PARA (TEXT \"abc\")))))"},
		{"::::\nabc\n:::\ndef\n:::\n::::", "(BLOCK (REGION-BLOCK () ((PARA (TEXT \"abc\")) (REGION-BLOCK () ((PARA (TEXT \"def\")))))))"},
		{":::{go}\n:::a", "(BLOCK (REGION-BLOCK ((\"go\" . \"\")) () (TEXT \"a\")))"},
		{":::\nabc\n::: def ", "(BLOCK (REGION-BLOCK () ((PARA (TEXT \"abc\"))) (TEXT \"def\")))"},
	})
}

func TestQuoteRegion(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"<<<\n<<<", "()"},
		{"<<<\nabc\n<<<", "(BLOCK (REGION-QUOTE () ((PARA (TEXT \"abc\")))))"},
		{"<<<\nabc\n<<<<", "(BLOCK (REGION-QUOTE () ((PARA (TEXT \"abc\")))))"},
		{"<<<<\nabc\n<<<<", "(BLOCK (REGION-QUOTE () ((PARA (TEXT \"abc\")))))"},
		{"<<<<\nabc\n<<<\ndef\n<<<\n<<<<", "(BLOCK (REGION-QUOTE () ((PARA (TEXT \"abc\")) (REGION-QUOTE () ((PARA (TEXT \"def\")))))))"},
		{"<<<go\n<<< a", "(BLOCK (REGION-QUOTE ((\"\" . \"go\")) () (TEXT \"a\")))"},
		{"<<<\nabc\n<<< def ", "(BLOCK (REGION-QUOTE () ((PARA (TEXT \"abc\"))) (TEXT \"def\")))"},
	})
}

func TestVerseRegion(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, replace("\"", nil, TestCases{
		{"$$$\n$$$", "()"},
		{"$$$\nabc\n$$$", "(BLOCK (REGION-VERSE () ((PARA (TEXT \"abc\")))))"},
		{"$$$\nabc\n$$$$", "(BLOCK (REGION-VERSE () ((PARA (TEXT \"abc\")))))"},
		{"$$$$\nabc\n$$$$", "(BLOCK (REGION-VERSE () ((PARA (TEXT \"abc\")))))"},
		{"$$$\nabc\ndef\n$$$", "(BLOCK (REGION-VERSE () ((PARA (TEXT \"abc\") (HARD) (TEXT \"def\")))))"},
		{"$$$$\nabc\n$$$\ndef\n$$$\n$$$$", "(BLOCK (REGION-VERSE () ((PARA (TEXT \"abc\")) (REGION-VERSE () ((PARA (TEXT \"def\")))))))"},
		{"$$$go\n$$$x", "(BLOCK (REGION-VERSE ((\"\" . \"go\")) () (TEXT \"x\")))"},
		{"$$$\nabc\n$$$ def ", "(BLOCK (REGION-VERSE () ((PARA (TEXT \"abc\"))) (TEXT \"def\")))"},
		{"$$$\n space \n$$$", "(BLOCK (REGION-VERSE () ((PARA (TEXT \" space\")))))"},
		{"$$$\n  spaces  \n$$$", "(BLOCK (REGION-VERSE () ((PARA (TEXT \"  spaces\")))))"},
		{"$$$\n  spaces  \n space  \n$$$", "(BLOCK (REGION-VERSE () ((PARA (TEXT \"  spaces  \") (HARD) (TEXT \" space\")))))"},
	}))
}

func TestHeading(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"=h", "(BLOCK (PARA (TEXT \"=h\")))"},
		{"= h", "(BLOCK (PARA (TEXT \"= h\")))"},
		{"==h", "(BLOCK (PARA (TEXT \"==h\")))"},
		{"== h", "(BLOCK (PARA (TEXT \"== h\")))"},
		{"===h", "(BLOCK (PARA (TEXT \"===h\")))"},
		{"===", "(BLOCK (PARA (TEXT \"===\")))"},
		{"=== h", "(BLOCK (HEADING 1 () \"\" \"\" (TEXT \"h\")))"},
		{"===  h", "(BLOCK (HEADING 1 () \"\" \"\" (TEXT \"h\")))"},
		{"==== h", "(BLOCK (HEADING 2 () \"\" \"\" (TEXT \"h\")))"},
		{"===== h", "(BLOCK (HEADING 3 () \"\" \"\" (TEXT \"h\")))"},
		{"====== h", "(BLOCK (HEADING 4 () \"\" \"\" (TEXT \"h\")))"},
		{"======= h", "(BLOCK (HEADING 5 () \"\" \"\" (TEXT \"h\")))"},
		{"======== h", "(BLOCK (HEADING 5 () \"\" \"\" (TEXT \"h\")))"},
		{"=", "(BLOCK (PARA (TEXT \"=\")))"},
		{"=== h=__=a__", "(BLOCK (HEADING 1 () \"\" \"\" (TEXT \"h=\") (FORMAT-EMPH () (TEXT \"=a\"))))"},
		{"=\n", "(BLOCK (PARA (TEXT \"=\")))"},
		{"a=", "(BLOCK (PARA (TEXT \"a=\")))"},
		{" =", "(BLOCK (PARA (TEXT \"=\")))"},
		{"=== h\na", "(BLOCK (HEADING 1 () \"\" \"\" (TEXT \"h\")) (PARA (TEXT \"a\")))"},
		{"=== h i {-}", "(BLOCK (HEADING 1 ((\"-\" . \"\")) \"\" \"\" (TEXT \"h i\")))"},
		{"=== h {{a}}", "(BLOCK (HEADING 1 () \"\" \"\" (TEXT \"h \") (EMBED () \"a\")))"},
		{"=== h{{a}}", "(BLOCK (HEADING 1 () \"\" \"\" (TEXT \"h\") (EMBED () \"a\")))"},
		{"=== {{a}}", "(BLOCK (HEADING 1 () \"\" \"\" (EMBED () \"a\")))"},
		{"=== h {{a}}{-}", "(BLOCK (HEADING 1 () \"\" \"\" (TEXT \"h \") (EMBED ((\"-\" . \"\")) \"a\")))"},
		{"=== h {{a}} {-}", "(BLOCK (HEADING 1 ((\"-\" . \"\")) \"\" \"\" (TEXT \"h \") (EMBED () \"a\")))"},
		{"=== h {-}{{a}}", "(BLOCK (HEADING 1 ((\"-\" . \"\")) \"\" \"\" (TEXT \"h\")))"},
		{"=== h{id=abc}", "(BLOCK (HEADING 1 ((\"id\" . \"abc\")) \"\" \"\" (TEXT \"h\")))"},
		{"=== h\n=== h", "(BLOCK (HEADING 1 () \"\" \"\" (TEXT \"h\")) (HEADING 1 () \"\" \"\" (TEXT \"h\")))"},
	})
}

func TestHRule(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"-", "(BLOCK (PARA (TEXT \"-\")))"},
		{"---", "(BLOCK (THEMATIC ()))"},
		{"----", "(BLOCK (THEMATIC ()))"},
		{"---A", "(BLOCK (THEMATIC ((\"\" . \"A\"))))"},
		{"---A-", "(BLOCK (THEMATIC ((\"\" . \"A-\"))))"},
		{"-1", "(BLOCK (PARA (TEXT \"-1\")))"},
		{"2-1", "(BLOCK (PARA (TEXT \"2-1\")))"},
		{"---  {  go  }  ", "(BLOCK (THEMATIC ((\"go\" . \"\"))))"},
		{"---  {  .go  }  ", "(BLOCK (THEMATIC ((\"class\" . \"go\"))))"},
	})
}

func TestList(t *testing.T) {
	t.Parallel()
	// No ">" in the following, because quotation lists may have empty items.
	for _, ch := range []string{"*", "#"} {
		checkTcs(t, true, replace(ch, nil, TestCases{
			{"$", "(BLOCK (PARA (TEXT \"$\")))"},
			{"$$", "(BLOCK (PARA (TEXT \"$$\")))"},
			{"$$$", "(BLOCK (PARA (TEXT \"$$$\")))"},
			{"$ ", "(BLOCK (PARA (TEXT \"$\")))"},
			{"$$ ", "(BLOCK (PARA (TEXT \"$$\")))"},
			{"$$$ ", "(BLOCK (PARA (TEXT \"$$$\")))"},
		}))
	}
	checkTcs(t, true, TestCases{
		{"* abc", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")))))"},
		{"** abc", "(BLOCK (UNORDERED (BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")))))))"},
		{"*** abc", "(BLOCK (UNORDERED (BLOCK (UNORDERED (BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")))))))))"},
		{"**** abc", "(BLOCK (UNORDERED (BLOCK (UNORDERED (BLOCK (UNORDERED (BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")))))))))))"},
		{"** abc\n**** def", "(BLOCK (UNORDERED (BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")) (UNORDERED (BLOCK (UNORDERED (BLOCK (PARA (TEXT \"def\")))))))))))"},
		{"* abc\ndef", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")))) (PARA (TEXT \"def\")))"},
		{"* abc\n def", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")))) (PARA (TEXT \"def\")))"},
		{"* abc\n* def", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\"))) (BLOCK (PARA (TEXT \"def\")))))"},
		{"* abc\n  def", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\") (SOFT) (TEXT \"def\")))))"},
		{"* abc\n   def", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\") (SOFT) (TEXT \"def\")))))"},
		{"* abc\n\ndef", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")))) (PARA (TEXT \"def\")))"},
		{"* abc\n\n def", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")))) (PARA (TEXT \"def\")))"},
		{"* abc\n\n  def", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")) (PARA (TEXT \"def\")))))"},
		{"* abc\n\n   def", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")) (PARA (TEXT \"def\")))))"},
		{"* abc\n** def", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")) (UNORDERED (BLOCK (PARA (TEXT \"def\")))))))"},
		{"* abc\n** def\n* ghi", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")) (UNORDERED (BLOCK (PARA (TEXT \"def\"))))) (BLOCK (PARA (TEXT \"ghi\")))))"},
		{"* abc\n\n  def\n* ghi", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")) (PARA (TEXT \"def\"))) (BLOCK (PARA (TEXT \"ghi\")))))"},
		{"* abc\n** def\n   ghi\n  jkl", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")) (UNORDERED (BLOCK (PARA (TEXT \"def\") (SOFT) (TEXT \"ghi\")))) (PARA (TEXT \"jkl\")))))"},

		// A list does not last beyond a region
		{":::\n# abc\n:::\n# def", "(BLOCK (REGION-BLOCK () ((ORDERED (BLOCK (PARA (TEXT \"abc\")))))) (ORDERED (BLOCK (PARA (TEXT \"def\")))))"},

		// A HRule creates a new list
		{"* abc\n---\n* def", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")))) (THEMATIC ()) (UNORDERED (BLOCK (PARA (TEXT \"def\")))))"},

		// Changing list type adds a new list
		{"* abc\n# def", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")))) (ORDERED (BLOCK (PARA (TEXT \"def\")))))"},

		// Quotation lists may have empty items
		{">", "(BLOCK (QUOTATION (BLOCK)))"},

		// Empty continuation
		{"* abc\n  ", "(BLOCK (UNORDERED (BLOCK (PARA (TEXT \"abc\")))))"},
	})
}

func TestQuoteList(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"> w1 w2", "(BLOCK (QUOTATION (BLOCK (PARA (TEXT \"w1 w2\")))))"},
		{"> w1\n> w2", "(BLOCK (QUOTATION (BLOCK (PARA (TEXT \"w1\") (SOFT) (TEXT \"w2\")))))"},
		{"> w1\n>w2", "(BLOCK (QUOTATION (BLOCK (PARA (TEXT \"w1\")))) (PARA (TEXT \">w2\")))"},
		{"> w1\n>\n>w2", "(BLOCK (QUOTATION (BLOCK (PARA (TEXT \"w1\"))) (BLOCK)) (PARA (TEXT \">w2\")))"},
		{"> w1\n> \n> w2", "(BLOCK (QUOTATION (BLOCK (PARA (TEXT \"w1\"))) (BLOCK) (BLOCK (PARA (TEXT \"w2\")))))"},
	})
}

func TestEnumAfterPara(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"abc\n* def", "(BLOCK (PARA (TEXT \"abc\")) (UNORDERED (BLOCK (PARA (TEXT \"def\")))))"},
		{"abc\n*def", "(BLOCK (PARA (TEXT \"abc\") (SOFT) (TEXT \"*def\")))"},
	})
}

func TestDefinition(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{";", "(BLOCK (PARA (TEXT \";\")))"},
		{"; ", "(BLOCK (PARA (TEXT \";\")))"},
		{"; abc", "(BLOCK (DESCRIPTION ((TEXT \"abc\"))))"},
		{"; abc\ndef", "(BLOCK (DESCRIPTION ((TEXT \"abc\"))) (PARA (TEXT \"def\")))"},
		{"; abc\n def", "(BLOCK (DESCRIPTION ((TEXT \"abc\"))) (PARA (TEXT \"def\")))"},
		{"; abc\n  def", "(BLOCK (DESCRIPTION ((TEXT \"abc\") (SOFT) (TEXT \"def\"))))"},
		{"; abc\n  def\n  ghi", "(BLOCK (DESCRIPTION ((TEXT \"abc\") (SOFT) (TEXT \"def\") (SOFT) (TEXT \"ghi\"))))"},
		{":", "(BLOCK (PARA (TEXT \":\")))"},
		{": ", "(BLOCK (PARA (TEXT \":\")))"},
		{": abc", "(BLOCK (PARA (TEXT \": abc\")))"},
		{"; abc\n: def", "(BLOCK (DESCRIPTION ((TEXT \"abc\")) (BLOCK (BLOCK (PARA (TEXT \"def\"))))))"},
		{"; abc\n: def\nghi", "(BLOCK (DESCRIPTION ((TEXT \"abc\")) (BLOCK (BLOCK (PARA (TEXT \"def\"))))) (PARA (TEXT \"ghi\")))"},
		{"; abc\n: def\n ghi", "(BLOCK (DESCRIPTION ((TEXT \"abc\")) (BLOCK (BLOCK (PARA (TEXT \"def\"))))) (PARA (TEXT \"ghi\")))"},
		{"; abc\n: def\n  ghi", "(BLOCK (DESCRIPTION ((TEXT \"abc\")) (BLOCK (BLOCK (PARA (TEXT \"def\") (SOFT) (TEXT \"ghi\"))))))"},
		{"; abc\n: def\n\n  ghi", "(BLOCK (DESCRIPTION ((TEXT \"abc\")) (BLOCK (BLOCK (PARA (TEXT \"def\"))) (PARA (TEXT \"ghi\")))))"},
		{"; abc\n:", "(BLOCK (DESCRIPTION ((TEXT \"abc\"))) (PARA (TEXT \":\")))"},
		{"; abc\n: def\n: ghi", "(BLOCK (DESCRIPTION ((TEXT \"abc\")) (BLOCK (BLOCK (PARA (TEXT \"def\"))) (BLOCK (PARA (TEXT \"ghi\"))))))"},
		{"; abc\n: def\n; ghi\n: jkl", "(BLOCK (DESCRIPTION ((TEXT \"abc\")) (BLOCK (BLOCK (PARA (TEXT \"def\")))) ((TEXT \"ghi\")) (BLOCK (BLOCK (PARA (TEXT \"jkl\"))))))"},

		// Empty description
		{"; abc\n: ", "(BLOCK (DESCRIPTION ((TEXT \"abc\"))) (PARA (TEXT \":\")))"},
		// Empty continuation of definition
		{"; abc\n: def\n  ", "(BLOCK (DESCRIPTION ((TEXT \"abc\")) (BLOCK (BLOCK (PARA (TEXT \"def\"))))))"},
	})
}

func TestTable(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"|", "()"},
		{"||", "(BLOCK (TABLE () ((CELL))))"},
		{"| |", "(BLOCK (TABLE () ((CELL))))"},
		{"|a", "(BLOCK (TABLE () ((CELL (TEXT \"a\")))))"},
		{"|a|", "(BLOCK (TABLE () ((CELL (TEXT \"a\")))))"},
		{"|a| ", "(BLOCK (TABLE () ((CELL (TEXT \"a\")) (CELL))))"},
		{"|a|b", "(BLOCK (TABLE () ((CELL (TEXT \"a\")) (CELL (TEXT \"b\")))))"},
		{"|a\n|b", "(BLOCK (TABLE () ((CELL (TEXT \"a\"))) ((CELL (TEXT \"b\")))))"},
		{"|a|b\n|c|d", "(BLOCK (TABLE () ((CELL (TEXT \"a\")) (CELL (TEXT \"b\"))) ((CELL (TEXT \"c\")) (CELL (TEXT \"d\")))))"},
		{"|%", "()"},
		{"|=a", "(BLOCK (TABLE ((CELL (TEXT \"a\")))))"},
		{"|=a\n|b", "(BLOCK (TABLE ((CELL (TEXT \"a\"))) ((CELL (TEXT \"b\")))))"},
		{"|a|b\n|%---\n|c|d", "(BLOCK (TABLE () ((CELL (TEXT \"a\")) (CELL (TEXT \"b\"))) ((CELL (TEXT \"c\")) (CELL (TEXT \"d\")))))"},
		{"|a|b\n|c", "(BLOCK (TABLE () ((CELL (TEXT \"a\")) (CELL (TEXT \"b\"))) ((CELL (TEXT \"c\")) (CELL))))"},
		{"|=<a>\n|b|c", "(BLOCK (TABLE ((CELL-LEFT (TEXT \"a\")) (CELL)) ((CELL-RIGHT (TEXT \"b\")) (CELL (TEXT \"c\")))))"},
		{"|=<a|=b>\n||", "(BLOCK (TABLE ((CELL-LEFT (TEXT \"a\")) (CELL-RIGHT (TEXT \"b\"))) ((CELL) (CELL-RIGHT))))"},
	})
}

func TestTransclude(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"{{{a}}}", "(BLOCK (TRANSCLUDE () (EXTERNAL \"a\")))"},
		{"{{{a}}}b", "(BLOCK (TRANSCLUDE ((\"\" . \"b\")) (EXTERNAL \"a\")))"},
		{"{{{a}}}}", "(BLOCK (TRANSCLUDE () (EXTERNAL \"a\")))"},
		{"{{{a\\}}}}", "(BLOCK (TRANSCLUDE () (EXTERNAL \"a\\\\}\")))"},
		{"{{{a\\}}}}b", "(BLOCK (TRANSCLUDE ((\"\" . \"b\")) (EXTERNAL \"a\\\\}\")))"},
		{"{{{a}}", "(BLOCK (PARA (TEXT \"{\") (EMBED () \"a\")))"},
		{"{{{a}}}{go=b}", "(BLOCK (TRANSCLUDE ((\"go\" . \"b\")) (EXTERNAL \"a\")))"},
	})
}

func TestBlockAttr(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{":::go\na\n:::", "(BLOCK (REGION-BLOCK ((\"\" . \"go\")) ((PARA (TEXT \"a\")))))"},
		{":::go=\na\n:::", "(BLOCK (REGION-BLOCK ((\"\" . \"go\")) ((PARA (TEXT \"a\")))))"},
		{":::{}\na\n:::", "(BLOCK (REGION-BLOCK () ((PARA (TEXT \"a\")))))"},
		{":::{ }\na\n:::", "(BLOCK (REGION-BLOCK () ((PARA (TEXT \"a\")))))"},
		{":::{.go}\na\n:::", "(BLOCK (REGION-BLOCK ((\"class\" . \"go\")) ((PARA (TEXT \"a\")))))"},
		{":::{=go}\na\n:::", "(BLOCK (REGION-BLOCK ((\"\" . \"go\")) ((PARA (TEXT \"a\")))))"},
		{":::{go}\na\n:::", "(BLOCK (REGION-BLOCK ((\"go\" . \"\")) ((PARA (TEXT \"a\")))))"},
		{":::{go=py}\na\n:::", "(BLOCK (REGION-BLOCK ((\"go\" . \"py\")) ((PARA (TEXT \"a\")))))"},
		{":::{.go=py}\na\n:::", "(BLOCK (REGION-BLOCK () ((PARA (TEXT \"a\")))))"},
		{":::{go=}\na\n:::", "(BLOCK (REGION-BLOCK ((\"go\" . \"\")) ((PARA (TEXT \"a\")))))"},
		{":::{.go=}\na\n:::", "(BLOCK (REGION-BLOCK () ((PARA (TEXT \"a\")))))"},
		{":::{go py}\na\n:::", "(BLOCK (REGION-BLOCK ((\"go\" . \"\") (\"py\" . \"\")) ((PARA (TEXT \"a\")))))"},
		{":::{go\npy}\na\n:::", "(BLOCK (REGION-BLOCK ((\"go\" . \"\") (\"py\" . \"\")) ((PARA (TEXT \"a\")))))"},
		{":::{.go py}\na\n:::", "(BLOCK (REGION-BLOCK ((\"class\" . \"go\") (\"py\" . \"\")) ((PARA (TEXT \"a\")))))"},
		{":::{go .py}\na\n:::", "(BLOCK (REGION-BLOCK ((\"class\" . \"py\") (\"go\" . \"\")) ((PARA (TEXT \"a\")))))"},
		{":::{.go py=3}\na\n:::", "(BLOCK (REGION-BLOCK ((\"class\" . \"go\") (\"py\" . \"3\")) ((PARA (TEXT \"a\")))))"},
		{":::  {  go  }  \na\n:::", "(BLOCK (REGION-BLOCK ((\"go\" . \"\")) ((PARA (TEXT \"a\")))))"},
		{":::  {  .go  }  \na\n:::", "(BLOCK (REGION-BLOCK ((\"class\" . \"go\")) ((PARA (TEXT \"a\")))))"},
	})
	checkTcs(t, true, replace("\"", nil, TestCases{
		{":::{py=3}\na\n:::", "(BLOCK (REGION-BLOCK ((\"py\" . \"3\")) ((PARA (TEXT \"a\")))))"},
		{":::{py=$2 3$}\na\n:::", "(BLOCK (REGION-BLOCK ((\"py\" . \"2 3\")) ((PARA (TEXT \"a\")))))"},
		{":::{py=$2\\$3$}\na\n:::", "(BLOCK (REGION-BLOCK ((\"py\" . \"2\\\"3\")) ((PARA (TEXT \"a\")))))"},
		{":::{py=2$3}\na\n:::", "(BLOCK (REGION-BLOCK ((\"py\" . \"2\\\"3\")) ((PARA (TEXT \"a\")))))"},
		{":::{py=$2\n3$}\na\n:::", "(BLOCK (REGION-BLOCK ((\"py\" . \"2\\n3\")) ((PARA (TEXT \"a\")))))"},
		{":::{py=$2 3}\na\n:::", "(BLOCK (REGION-BLOCK () ((PARA (TEXT \"a\")))))"},
		{":::{py=2 py=3}\na\n:::", "(BLOCK (REGION-BLOCK ((\"py\" . \"2 3\")) ((PARA (TEXT \"a\")))))"},
		{":::{.go .py}\na\n:::", "(BLOCK (REGION-BLOCK ((\"class\" . \"go py\")) ((PARA (TEXT \"a\")))))"},
		{":::{go go}\na\n:::", "(BLOCK (REGION-BLOCK ((\"go\" . \"\")) ((PARA (TEXT \"a\")))))"},
		{":::{=py =go}\na\n:::", "(BLOCK (REGION-BLOCK ((\"\" . \"go\")) ((PARA (TEXT \"a\")))))"},
	}))
}

func TestInlineAttr(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"::a::{}", "(BLOCK (PARA (FORMAT-SPAN () (TEXT \"a\"))))"},
		{"::a::{ }", "(BLOCK (PARA (FORMAT-SPAN () (TEXT \"a\"))))"},
		{"::a::{.go}", "(BLOCK (PARA (FORMAT-SPAN ((\"class\" . \"go\")) (TEXT \"a\"))))"},
		{"::a::{=go}", "(BLOCK (PARA (FORMAT-SPAN ((\"\" . \"go\")) (TEXT \"a\"))))"},
		{"::a::{go}", "(BLOCK (PARA (FORMAT-SPAN ((\"go\" . \"\")) (TEXT \"a\"))))"},
		{"::a::{go=py}", "(BLOCK (PARA (FORMAT-SPAN ((\"go\" . \"py\")) (TEXT \"a\"))))"},
		{"::a::{.go=py}", "(BLOCK (PARA (FORMAT-SPAN () (TEXT \"a\")) (TEXT \"{.go=py}\")))"},
		{"::a::{go=}", "(BLOCK (PARA (FORMAT-SPAN ((\"go\" . \"\")) (TEXT \"a\"))))"},
		{"::a::{.go=}", "(BLOCK (PARA (FORMAT-SPAN () (TEXT \"a\")) (TEXT \"{.go=}\")))"},
		{"::a::{go py}", "(BLOCK (PARA (FORMAT-SPAN ((\"go\" . \"\") (\"py\" . \"\")) (TEXT \"a\"))))"},
		{"::a::{go\npy}", "(BLOCK (PARA (FORMAT-SPAN ((\"go\" . \"\") (\"py\" . \"\")) (TEXT \"a\"))))"},
		{"::a::{.go py}", "(BLOCK (PARA (FORMAT-SPAN ((\"class\" . \"go\") (\"py\" . \"\")) (TEXT \"a\"))))"},
		{"::a::{go .py}", "(BLOCK (PARA (FORMAT-SPAN ((\"class\" . \"py\") (\"go\" . \"\")) (TEXT \"a\"))))"},
		{"::a::{  \n go \n .py\n  \n}", "(BLOCK (PARA (FORMAT-SPAN ((\"class\" . \"py\") (\"go\" . \"\")) (TEXT \"a\"))))"},
		{"::a::{  \n go \n .py\n\n}", "(BLOCK (PARA (FORMAT-SPAN ((\"class\" . \"py\") (\"go\" . \"\")) (TEXT \"a\"))))"},
		{"::a::{\ngo\n}", "(BLOCK (PARA (FORMAT-SPAN ((\"go\" . \"\")) (TEXT \"a\"))))"},
	})
	checkTcs(t, true, TestCases{
		{"::a::{py=3}", "(BLOCK (PARA (FORMAT-SPAN ((\"py\" . \"3\")) (TEXT \"a\"))))"},
		{"::a::{py=\"2 3\"}", "(BLOCK (PARA (FORMAT-SPAN ((\"py\" . \"2 3\")) (TEXT \"a\"))))"},
		{"::a::{py=\"2\\\"3\"}", "(BLOCK (PARA (FORMAT-SPAN ((\"py\" . \"2\\\"3\")) (TEXT \"a\"))))"},
		{"::a::{py=2\"3}", "(BLOCK (PARA (FORMAT-SPAN ((\"py\" . \"2\\\"3\")) (TEXT \"a\"))))"},
		{"::a::{py=\"2\n3\"}", "(BLOCK (PARA (FORMAT-SPAN ((\"py\" . \"2\\n3\")) (TEXT \"a\"))))"},
		{"::a::{py=\"2 3}", "(BLOCK (PARA (FORMAT-SPAN () (TEXT \"a\")) (TEXT \"{py=\\\"2 3}\")))"},
	})
	checkTcs(t, true, TestCases{
		{"::a::{py=2 py=3}", "(BLOCK (PARA (FORMAT-SPAN ((\"py\" . \"2 3\")) (TEXT \"a\"))))"},
		{"::a::{.go .py}", "(BLOCK (PARA (FORMAT-SPAN ((\"class\" . \"go py\")) (TEXT \"a\"))))"},
	})
}

func TestTemp(t *testing.T) {
	t.Parallel()
	checkTcs(t, true, TestCases{
		{"", "()"},
	})
}

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//-----------------------------------------------------------------------------
// Copyright (c) 2022-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2022-present Detlef Stern
//-----------------------------------------------------------------------------

// Package text provides types, constants and function to work with text output.
package text

import (
	"strings"

	"t73f.de/r/sx"
	"codeberg.org/t73fde/sxpf"
	"t73f.de/r/zsc/input"
	"t73f.de/r/zsc/sz"
	"zettelstore.de/c/sexpr"
)

// Encoder is the structure to hold relevant data to execute the encoding.
type Encoder struct {
	sf sxpf.SymbolFactory
	sb strings.Builder
}

func NewEncoder() *Encoder {

	symText  *sxpf.Symbol
	symSpace *sxpf.Symbol
	symSoft  *sxpf.Symbol
	symHard  *sxpf.Symbol
	symQuote *sxpf.Symbol
}

func NewEncoder(sf sxpf.SymbolFactory) *Encoder {
	if sf == nil {
		return nil
	}
	enc := &Encoder{
		sf:       sf,
		sb: strings.Builder{},
		sb:       strings.Builder{},
		symText:  sf.MustMake(sexpr.NameSymText),
		symSpace: sf.MustMake(sexpr.NameSymSpace),
		symSoft:  sf.MustMake(sexpr.NameSymSoft),
		symHard:  sf.MustMake(sexpr.NameSymHard),
		symQuote: sf.MustMake(sexpr.NameSymQuote),
	}
	return enc
}

func (enc *Encoder) Encode(lst *sx.Pair) string {
func (enc *Encoder) Encode(lst *sxpf.List) string {
	enc.executeList(lst)
	result := enc.sb.String()
	enc.sb.Reset()
	return result
}

// EvaluateInlineString returns the text content of the given inline list as a string.
func EvaluateInlineString(lst *sx.Pair) string {
	return NewEncoder().Encode(lst)
}

func (enc *Encoder) executeList(lst *sx.Pair) {
func EvaluateInlineString(lst *sxpf.List) string {
	if sf := sxpf.FindSymbolFactory(lst); sf != nil {
		return NewEncoder(sf).Encode(lst)
	}
	return ""
}

func (enc *Encoder) executeList(lst *sxpf.List) {
	for elem := lst; elem != nil; elem = elem.Tail() {
		enc.execute(elem.Car())
	}
}
func (enc *Encoder) execute(obj sx.Object) {
	cmd, isPair := sx.GetPair(obj)
	if !isPair {
func (enc *Encoder) execute(obj sxpf.Object) {
	cmd, ok := obj.(*sxpf.List)
	if !ok {
		return
	}
	sym := cmd.Car()
	if sx.IsNil(sym) {
	if sxpf.IsNil(sym) {
		return
	}
	if sym.IsEqual(sz.SymText) {
	if sym.IsEqual(enc.symText) {
		args := cmd.Tail()
		if args == nil {
			return
		}
		if val, isString := sx.GetString(args.Car()); isString {
		if val, ok2 := args.Car().(sxpf.String); ok2 {
			hadSpace := false
			for _, ch := range val.GetValue() {
				if input.IsSpace(ch) {
					if !hadSpace {
						enc.sb.WriteByte(' ')
			enc.sb.WriteString(val.String())
						hadSpace = true
					}
		}
				} else {
					enc.sb.WriteRune(ch)
					hadSpace = false
				}
			}
		}
	} else if sym.IsEqual(sz.SymSoft) {
	} else if sym.IsEqual(enc.symSpace) || sym.IsEqual(enc.symSoft) {
		enc.sb.WriteByte(' ')
	} else if sym.IsEqual(sz.SymHard) {
	} else if sym.IsEqual(enc.symHard) {
		enc.sb.WriteByte('\n')
	} else if !sym.IsEqual(sx.SymbolQuote) {
	} else if !sym.IsEqual(enc.symQuote) {
		enc.executeList(cmd.Tail())
	}
}

Changes to text/text_test.go.

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//-----------------------------------------------------------------------------
// Copyright (c) 2022-present Detlef Stern
//
// This file is part of zettelstore-client.
//
// Zettelstore client is licensed under the latest version of the EUPL
// (European Union Public License). Please see file LICENSE.txt for your rights
// and obligations under this license.
//
// SPDX-License-Identifier: EUPL-1.2
// SPDX-FileCopyrightText: 2022-present Detlef Stern
//-----------------------------------------------------------------------------

package text_test

import (
	"strings"
	"testing"

	"t73f.de/r/sx"
	"t73f.de/r/sx/sxreader"
	"t73f.de/r/zsc/text"
	"codeberg.org/t73fde/sxpf"
	"codeberg.org/t73fde/sxpf/reader"
	"zettelstore.de/c/text"
)

func TestSzText(t *testing.T) {
func TestSexprText(t *testing.T) {
	testcases := []struct {
		src string
		exp string
	}{
		{"()", ""},
		{`(INLINE (TEXT "a"))`, "a"},
		{`(INLINE (TEXT " "))`, " "},
		{`(INLINE (SPACE "a"))`, " "},
		{`(INLINE (TEXT "  "))`, " "},
	}
	for i, tc := range testcases {
		sval, err := sxreader.MakeReader(strings.NewReader(tc.src)).Read()
		sval, err := reader.MakeReader(strings.NewReader(tc.src)).Read()
		if err != nil {
			t.Error(err)
			continue
		}
		seq, isPair := sx.GetPair(sval)
		if !isPair {
		seq, ok := sval.(*sxpf.List)
		if !ok {
			t.Errorf("%d: not a list: %v", i, sval)
		}
		got := text.EvaluateInlineString(seq)
		if got != tc.exp {
			t.Errorf("%d: EncodeBlock(%q) == %q, but got %q", i, tc.src, tc.exp, got)
		}
	}

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<title>Change Log</title>

<a name="0_19"></a>
<h2>Changes for Version 0.19.0 (pending)</h2>
  *  Remove support for rename operation; removed all associated constants

<a name="0_18"></a>
<h2>Changes for Version 0.18.0 (2024-07-11)</h2>
  *  Add client method <code>GetApplicationZid</code> to retrieve the zettel
     identifier of an configuration zettel for a specific application.
  *  Rename to be package <code>t73f.de/r/zsc</code>
  *  Reserve some zettel identifier for future use
  *  Mark <code>client.Client.RenameZettel</code> as deprecated
  *  Remove space node from (Sx-) AST

<a name="0_17"></a>
<h2>Changes for Version 0.17.0 (2024-03-04)</h2>
  *  Generic GET method for HTTP client.
  *  Adapt to sz changes; see manual for current syntax.
  *  Got some packages from Zettelstore, for general use.

<a name="0_16"></a>
<h2>Changes for Version 0.16.0 (2023-11-30)</h2>
  *  Refactor shtml transformator to support evaluating the language tree of a
     zettel AST. Its API has been changes, since evaluation is now top-down,
     where previous transformation was bottom.up.
  *  Add API call to retrieve role zettel.
  *  Added constants for role zettel and to mark text within zettelmarkup.

<a name="0_15"></a>
<h2>Changes for Version 0.15.0 (2023-10-26)</h2>
  *  Tag zettel: API, constant values
  *  Refactorings b/c Sx

<a name="0_14"></a>
<h2>Changes for Version 0.14.0 (2023-09-23)</h2>
  *  Remove support for JSON encoding

<a name="0_13"></a>
<h2>Changes for Version 0.13.0 (2023-08-07)</h2>
  *  API uses plain data or sx data, but no JSON encoded data.
  *  Dependency sx is now hosted on Fossil repository, same for this library.

<a name="0_12"></a>
<h2>Changes for Version 0.12.0 (2023-06-05)</h2>
<h2>Changes for Version 0.12.0 (pending)</h2>
  *  Rename "sexpr" to "sz".

<a name="0_11"></a>
<h2>Changes for Version 0.11.0 (2023-03-27)</h2>
  *  Remove all zjson related declarations.
  *  Generate HTML via SxHTML, not manually and direct.

<a name="0_10"></a>

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<title>Home</title>

This repository contains Go client software to
access [https://zettelstore.de|Zettelstore] via its API.

<h3>Latest Release: 0.18.0 (2024-07-11)</h3>
  *  [./changes.wiki#0_18|Change summary]
  *  [/timeline?p=v0.18.0&bt=v0.17.0&y=ci|Check-ins for version 0.18.0],
     [/vdiff?to=v0.18.0&from=v0.17.0|content diff]
  *  [/timeline?df=v0.18.0&y=ci|Check-ins derived from the 0.18.0 release],
     [/vdiff?from=v0.18.0&to=trunk|content diff]
<h3>Latest Release: 0.11.0 (2023-03-27)</h3>
  *  [./changes.wiki#0_11|Change summary]
  *  [/timeline?p=v0.11.0&bt=v0.10.0&y=ci|Check-ins for version 0.11.0],
     [/vdiff?to=v0.11.0&from=v0.10.0|content diff]
  *  [/timeline?df=v0.11.0&y=ci|Check-ins derived from the 0.11.0 release],
     [/vdiff?from=v0.11.0&to=trunk|content diff]
  *  [/timeline?t=release|Timeline of all past releases]

<h3>Use instructions</h3>

If you want to import this library into your own [https://go.dev/|Go] software,
you must execute a <code>go get</code> command. Since Go treats non-standard
software and non-standard platforms quite badly, you must use some non-standard
commands.

First, you must install the version control system
[https://fossil-scm.org|Fossil], which is a superior solution compared to Git,
in too many use cases. It is just a single executable, nothing more. Make sure,
it is in your search path for commands.

How you can execute the following Go command to retrieve a given version of
this library:

<code>GOVCS=zettelstore.de:fossil go get -x t73f.de/r/zsc@HASH</code>

where <code>HASH</code> is the hash value of the commit you want to use.

Go currently seems not to support software versions when the software is
managed by Fossil. This explains the need for the hash value. However, this
methods works and you can use the client software to access a Zettelstore.