Zettelstore

0.4

type DescriptionSlice []DescriptionNode

// InlineNode is the interface that all inline nodes must implement.
type InlineNode interface {
	Node
	inlineNode()
}

// InlineEmbedNode is a node that specifies some embeddings in inline mode.
// It is abstract, b/c there are different concrete type implementations.
type InlineEmbedNode interface {
	InlineNode
	inlineEmbedNode()
}

// Reference is a reference to external or internal material.
type Reference struct {
	URL   *url.URL
	Value string
	State RefState
}

//-----------------------------------------------------------------------------
// Copyright (c) 2020-2022 Detlef Stern
//
// This file is part of Zettelstore.
//
// Zettelstore 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 ast

import "zettelstore.de/c/zjson"

// Definition of Block nodes.

// BlockSlice is a slice of BlockNodes.
type BlockSlice []BlockNode

func (*BlockSlice) blockNode() { /* Just a marker */ }

}

//--------------------------------------------------------------------------

// VerbatimNode contains uninterpreted text
type VerbatimNode struct {
	Kind    VerbatimKind
	Attrs   zjson.Attributes
	Content []byte
}

// VerbatimKind specifies the format that is applied to code inline nodes.
type VerbatimKind uint8

// Constants for VerbatimCode
const (
	_               VerbatimKind = iota
	VerbatimZettel               // Zettel content
	VerbatimProg                 // Program code

	VerbatimComment              // Block comment
	VerbatimHTML                 // Block HTML, e.g. for Markdown

)

func (*VerbatimNode) blockNode() { /* Just a marker */ }
func (*VerbatimNode) itemNode()  { /* Just a marker */ }

// WalkChildren does nothing.
func (*VerbatimNode) WalkChildren(Visitor) { /* No children*/ }






//--------------------------------------------------------------------------

// RegionNode encapsulates a region of block nodes.
type RegionNode struct {
	Kind    RegionKind
	Attrs   zjson.Attributes
	Blocks  BlockSlice
	Inlines InlineSlice // Optional text at the end of the region
}

// RegionKind specifies the actual region type.
type RegionKind uint8

// Values for RegionCode
const (
	_           RegionKind = iota
	RegionSpan             // Just a span of blocks
	RegionQuote            // A longer quotation
	RegionVerse            // Line breaks matter

}

//--------------------------------------------------------------------------

// HeadingNode stores the heading text and level.
type HeadingNode struct {
	Level    int
	Inlines  InlineSlice // Heading text, possibly formatted
	Slug     string      // Heading text, normalized
	Fragment string      // Heading text, suitable to be used as an unique URL fragment
	Attrs    zjson.Attributes
}

func (*HeadingNode) blockNode() { /* Just a marker */ }
func (*HeadingNode) itemNode()  { /* Just a marker */ }

// WalkChildren walks the heading text.
func (hn *HeadingNode) WalkChildren(v Visitor) {
	Walk(v, &hn.Inlines)
}

//--------------------------------------------------------------------------

// HRuleNode specifies a horizontal rule.
type HRuleNode struct {
	Attrs zjson.Attributes
}

func (*HRuleNode) blockNode() { /* Just a marker */ }
func (*HRuleNode) itemNode()  { /* Just a marker */ }

// WalkChildren does nothing.
func (*HRuleNode) WalkChildren(Visitor) { /* No children*/ }

//--------------------------------------------------------------------------

// NestedListNode specifies a nestable list, either ordered or unordered.
type NestedListNode struct {
	Kind  NestedListKind
	Items []ItemSlice
	Attrs zjson.Attributes
}

// NestedListKind specifies the actual list type.
type NestedListKind uint8

// Values for ListCode
const (

//-----------------------------------------------------------------------------

package ast

import (
	"unicode/utf8"

	"zettelstore.de/c/zjson"
)

// Definitions of inline nodes.

// InlineSlice is a list of BlockNodes.
type InlineSlice []InlineNode

// WalkChildren does nothing.
func (*BreakNode) WalkChildren(Visitor) { /* No children*/ }

// --------------------------------------------------------------------------

// LinkNode contains the specified link.
type LinkNode struct {

	Ref     *Reference
	Inlines InlineSlice      // The text associated with the link.
	Attrs   zjson.Attributes // Optional attributes
}

func (*LinkNode) inlineNode() { /* Just a marker */ }

// WalkChildren walks to the link text.
func (ln *LinkNode) WalkChildren(v Visitor) {
	if len(ln.Inlines) > 0 {
		Walk(v, &ln.Inlines)
	}
}

// --------------------------------------------------------------------------

// EmbedRefNode contains the specified embedded reference material.
type EmbedRefNode struct {

	Ref     *Reference       // The reference to be embedded.

	Inlines InlineSlice      // Optional text associated with the image.
	Attrs   zjson.Attributes // Optional attributes
	Syntax  string           // Syntax of referenced material, if known
}

func (*EmbedRefNode) inlineNode()      { /* Just a marker */ }
func (*EmbedRefNode) inlineEmbedNode() { /* Just a marker */ }

// WalkChildren walks to the text that describes the embedded material.
func (en *EmbedRefNode) WalkChildren(v Visitor) {
	Walk(v, &en.Inlines)
}

// --------------------------------------------------------------------------

// EmbedBLOBNode contains the specified embedded BLOB material.
type EmbedBLOBNode struct {
	Blob    []byte           // BLOB data itself.
	Syntax  string           // Syntax of Blob

	Inlines InlineSlice      // Optional text associated with the image.
	Attrs   zjson.Attributes // Optional attributes
}

func (*EmbedBLOBNode) inlineNode()      { /* Just a marker */ }
func (*EmbedBLOBNode) inlineEmbedNode() { /* Just a marker */ }

// WalkChildren walks to the text that describes the embedded material.
func (en *EmbedBLOBNode) WalkChildren(v Visitor) {
	Walk(v, &en.Inlines)
}

// --------------------------------------------------------------------------

// CiteNode contains the specified citation.
type CiteNode struct {

	Key     string           // The citation key
	Inlines InlineSlice      // Optional text associated with the citation.
	Attrs   zjson.Attributes // Optional attributes
}

func (*CiteNode) inlineNode() { /* Just a marker */ }

// WalkChildren walks to the cite text.
func (cn *CiteNode) WalkChildren(v Visitor) {
	Walk(v, &cn.Inlines)

	}
}

// --------------------------------------------------------------------------

// FootnoteNode contains the specified footnote.
type FootnoteNode struct {

	Inlines InlineSlice      // The footnote text.
	Attrs   zjson.Attributes // Optional attributes
}

func (*FootnoteNode) inlineNode() { /* Just a marker */ }

// WalkChildren walks to the footnote text.
func (fn *FootnoteNode) WalkChildren(v Visitor) {
	Walk(v, &fn.Inlines)
}

// --------------------------------------------------------------------------

// FormatNode specifies some inline formatting.
type FormatNode struct {
	Kind    FormatKind
	Attrs   zjson.Attributes // Optional attributes.
	Inlines InlineSlice
}

// FormatKind specifies the format that is applied to the inline nodes.
type FormatKind uint8

// Constants for FormatCode
const (
	_            FormatKind = iota
	FormatEmph              // Emphasized text.
	FormatStrong            // Strongly emphasized text.
	FormatInsert            // Inserted text.

}

// --------------------------------------------------------------------------

// LiteralNode specifies some uninterpreted text.
type LiteralNode struct {
	Kind    LiteralKind
	Attrs   zjson.Attributes // Optional attributes.
	Content []byte
}

// LiteralKind specifies the format that is applied to code inline nodes.
type LiteralKind uint8

// Constants for LiteralCode
const (
	_              LiteralKind = iota
	LiteralZettel              // Zettel content
	LiteralProg                // Inline program code
	LiteralInput               // Computer input, e.g. Keyboard strokes
	LiteralOutput              // Computer output
	LiteralComment             // Inline comment
	LiteralHTML                // Inline HTML, e.g. for Markdown

)

func (*LiteralNode) inlineNode() { /* Just a marker */ }

// WalkChildren does nothing.
func (*LiteralNode) WalkChildren(Visitor) { /* No children*/ }

//-----------------------------------------------------------------------------

package ast_test

import (
	"testing"

	"zettelstore.de/c/zjson"
	"zettelstore.de/z/ast"
)

func BenchmarkWalk(b *testing.B) {
	root := ast.BlockSlice{
		&ast.HeadingNode{
			Inlines: ast.CreateInlineSliceFromWords("A", "Simple", "Heading"),

		},
		&ast.ParaNode{
			Inlines: ast.CreateInlineSliceFromWords("This", "is", "some", "intermediate", "text."),
		},
		ast.CreateParaNode(
			&ast.FormatNode{
				Kind: ast.FormatEmph,
				Attrs: zjson.Attributes(map[string]string{
					"":      "class",
					"color": "green",
				}),
				Inlines: ast.CreateInlineSliceFromWords("This", "is", "some", "emphasized", "text."),
			},
			&ast.SpaceNode{Lexeme: " "},
			&ast.LinkNode{

//-----------------------------------------------------------------------------
// Copyright (c) 2021 Detlef Stern
//
// This file is part of zettelstore.
//
// Zettelstore 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 impl provides services for authentification / authorization.

    clear: both;
    visibility: hidden;
  }
  main form div { margin: .5em 0 0 0 }
  input { font-family: monospace }
  input[type="submit"],button,select { font: inherit }
  label { font-family: sans-serif; font-size:.9rem }
  label::after { content:":" }
  textarea {
    font-family: monospace;
    resize: vertical;
    width: 100%;
  }
  .zs-input {
    padding: .5em;
    display:block;
    border:none;
    border-bottom:1px solid #ccc;
    width:100%;
  }
  .zs-button {
    float:right;

    margin: .5em 0 .5em 1em;
  }
  a:not([class]) { text-decoration-skip-ink: auto }
  a.broken { text-decoration: line-through }
  img { max-width: 100% }
  img.right { float: right }
  ol.endnotes {
    padding-top: .5rem;
    border-top: 1px solid;
  }
  kbd { font-family:monospace }
  code,pre {
    font-family: monospace;
    font-size: 85%;

<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="Zettelstore">
<meta name="format-detection" content="telephone=no">
{{{MetaHeader}}}
<link rel="stylesheet" href="{{{CSSBaseURL}}}">
<link rel="stylesheet" href="{{{CSSUserURL}}}">

<title>{{Title}}</title>
</head>
<body>
<nav class="zs-menu">
<a href="{{{HomeURL}}}">Home</a>
{{#WithUser}}
<div class="zs-dropdown">

<form action="{{{SearchURL}}}">
<input type="text" placeholder="Search.." name="{{QueryKeySearch}}">
</form>
</nav>
<main class="content">
{{{Content}}}
</main>
{{#FooterHTML}}

<footer>
{{{FooterHTML}}}
</footer>
{{/FooterHTML}}

		constHeader{
			api.KeyTitle:      "Zettelstore User CSS",
			api.KeyRole:       api.ValueRoleConfiguration,
			api.KeySyntax:     "css",
			api.KeyVisibility: api.ValueVisibilityPublic,
		},
		domain.NewContent([]byte("/* User-defined CSS */"))},








	id.EmojiZid: {
		constHeader{
			api.KeyTitle:      "Generic Emoji",
			api.KeyRole:       api.ValueRoleConfiguration,
			api.KeySyntax:     api.ValueSyntaxGif,
			api.KeyReadOnly:   api.ValueTrue,
			api.KeyVisibility: api.ValueVisibilityPublic,
		},
		domain.NewContent(contentEmoji)},
	id.TOCNewTemplateZid: {

{{/HasUselessFiles}}
<dl>
{{#MetaPairs}}
<dt>{{Key}}:</dt><dd>{{Value}}</dd>
{{/MetaPairs}}
</dl>
<form method="POST">
<input class="zs-button" type="submit" value="Delete">
</form>
</article>
{{end}}

<article>
<header>
<h1>{{Heading}}</h1>
</header>
<form method="POST">
<div>
<label for="title">Title</label>
<input class="zs-input" type="text" id="title" name="title" placeholder="Title.." value="{{MetaTitle}}" autofocus>
</div>
<div>
<div>
<label for="role">Role</label>
<input class="zs-input" type="text" id="role" name="role" placeholder="role.." value="{{MetaRole}}">







</div>
<label for="tags">Tags</label>
<input class="zs-input" type="text" id="tags" name="tags" placeholder="#tag" value="{{MetaTags}}">
</div>
<div>
<label for="meta">Metadata</label>
<textarea class="zs-input" id="meta" name="meta" rows="4" placeholder="metakey: metavalue">
{{#MetaPairsRest}}
{{Key}}: {{Value}}
{{/MetaPairsRest}}
</textarea>
</div>
<div>
<label for="syntax">Syntax</label>
<input class="zs-input" type="text" id="syntax" name="syntax" placeholder="syntax.." value="{{MetaSyntax}}">
</div>
<div>
{{#IsTextContent}}
<label for="content">Content</label>
<textarea class="zs-input zs-content" id="meta" name="content" rows="20" placeholder="Your content..">{{Content}}</textarea>
{{/IsTextContent}}
</div>

<input class="zs-button" type="submit" value="Submit">


</form>
</article>

<article>
<header>
<h1>{{Title}}</h1>
</header>
{{#Retry}}
<div class="zs-indication zs-error">Wrong user name / password. Try again.</div>
{{/Retry}}
<form method="POST" action="">
<div>
<label for="username">User name</label>
<input class="zs-input" type="text" id="username" name="username" placeholder="Your user name.." autofocus>
</div>
<div>
<label for="password">Password</label>
<input class="zs-input" type="password" id="password" name="password" placeholder="Your password..">
</div>
<input class="zs-button" type="submit" value="Login">
</form>
</article>

{{/HasUselessFiles}}
<form method="POST">
<div>
<label for="newid">New zettel id</label>
<input class="zs-input" type="text" id="newzid" name="newzid" placeholder="ZID.." value="{{Zid}}" autofocus>
</div>
<input type="hidden" id="curzid" name="curzid" value="{{Zid}}">
<input class="zs-button" type="submit" value="Rename">
</form>
<dl>
{{#MetaPairs}}
<dt>{{Key}}:</dt><dd>{{Value}}</dd>
{{/MetaPairs}}
</dl>
</article>

func (dp *dirBox) ReadStats(st *box.ManagedBoxStats) {
	st.ReadOnly = dp.readonly
	st.Zettel = dp.dirSrv.NumDirEntries()
	dp.log.Trace().Int("zettel", int64(st.Zettel)).Msg("ReadStats")
}

func (dp *dirBox) cleanupMeta(m *meta.Meta) {
	if role, ok := m.Get(api.KeyRole); !ok || role == "" {
		m.Set(api.KeyRole, dp.cdata.Config.GetDefaultRole())
	}
	if syntax, ok := m.Get(api.KeySyntax); !ok || syntax == "" {
		m.Set(api.KeySyntax, dp.cdata.Config.GetDefaultSyntax())
	}
}

//-----------------------------------------------------------------------------
// Copyright (c) 2020-2022 Detlef Stern
//
// This file is part of zettelstore.
//
// Zettelstore 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 dirbox

//-----------------------------------------------------------------------------
// Copyright (c) 2021-2022 Detlef Stern
//
// This file is part of zettelstore.
//
// Zettelstore 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 filebox

// Package manager coordinates the various boxes and indexes of a Zettelstore.
package manager

import (
	"context"
	"io"
	"net/url"
	"sort"
	"sync"
	"time"


	"zettelstore.de/z/auth"
	"zettelstore.de/z/box"
	"zettelstore.de/z/box/manager/memstore"
	"zettelstore.de/z/box/manager/store"
	"zettelstore.de/z/config"
	"zettelstore.de/z/domain/id"
	"zettelstore.de/z/domain/meta"

	if _, ok := registry[scheme]; ok {
		panic(scheme)
	}
	registry[scheme] = create
}

// GetSchemes returns all registered scheme, ordered by scheme string.
func GetSchemes() []string {
	result := make([]string, 0, len(registry))
	for scheme := range registry {
		result = append(result, scheme)
	}
	sort.Strings(result)
	return result
}

// Manager is a coordinating box.
type Manager struct {
	mgrLog       *logger.Logger
	mgrMx        sync.RWMutex
	started      bool
	rtConfig     config.Config

	"fmt"
	"io"
	"sort"
	"strings"
	"sync"

	"zettelstore.de/c/api"

	"zettelstore.de/z/box/manager/store"
	"zettelstore.de/z/domain/id"
	"zettelstore.de/z/domain/meta"
)

type metaRefs struct {
	forward  id.Slice

}

func dumpStringRefs(w io.Writer, title, preString, postString string, srefs stringRefs) {
	if len(srefs) == 0 {
		return
	}
	fmt.Fprintln(w, "====", title)
	slice := make([]string, 0, len(srefs))
	for s := range srefs {
		slice = append(slice, s)
	}
	sort.Strings(slice)
	for _, s := range slice {
		fmt.Fprintf(w, "; %s%s%s\n", preString, s, postString)
		fmt.Fprintln(w, ":", srefs[s])
	}
}

import (
	"testing"

	"zettelstore.de/c/api"
	"zettelstore.de/z/domain/id"
	_ "zettelstore.de/z/parser/blob"       // Allow to use BLOB parser.
	_ "zettelstore.de/z/parser/draw"       // Allow to use draw parser.
	_ "zettelstore.de/z/parser/markdown"   // Allow to use markdown parser.
	_ "zettelstore.de/z/parser/none"       // Allow to use none parser.
	_ "zettelstore.de/z/parser/plain"      // Allow to use plain parser.
	_ "zettelstore.de/z/parser/zettelmark" // Allow to use zettelmark parser.
)

func TestSeekZid(t *testing.T) {

		}
	}
}

func TestNewExtIsBetter(t *testing.T) {
	extVals := []string{
		// Main Formats
		api.ValueSyntaxZmk, api.ValueSyntaxDraw, "markdown", "md",
		// Other supported text formats
		"css", "txt", api.ValueSyntaxHTML, api.ValueSyntaxNone, "mustache", api.ValueSyntaxText, "plain",
		// Supported graphics formats
		api.ValueSyntaxGif, "png", api.ValueSyntaxSVG, "jpeg", "jpg",
		// Unsupported syntax values
		"gz", "cpp", "tar", "cppc",
	}

//-----------------------------------------------------------------------------
// Copyright (c) 2020-2022 Detlef Stern
//
// This file is part of zettelstore.
//
// Zettelstore 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 notify

}

func calcContentExt(syntax string, yamlSep bool, getZettelFileSyntax func() []string) string {
	if yamlSep {
		return extZettel
	}
	switch syntax {
	case api.ValueSyntaxDraw, api.ValueSyntaxNone, api.ValueSyntaxZmk:
		return extZettel
	}
	for _, s := range getZettelFileSyntax() {
		if s == syntax {
			return extZettel
		}
	}

		domain.Zettel{
			Meta:    m,
			Content: domain.NewContent(inp.Src[inp.Pos:]),
		},
		m.GetDefault(api.KeySyntax, api.ValueSyntaxZmk),
		nil,
	)
	encdr := encoder.Create(api.Encoder(enc), &encoder.Environment{
		Lang: m.GetDefault(api.KeyLang, api.ValueLangEN),
	})
	if encdr == nil {
		fmt.Fprintf(os.Stderr, "Unknown format %q\n", enc)
		return 2, nil
	}
	_, err = encdr.WriteZettel(os.Stdout, z, parser.ParseMetadata)
	if err != nil {
		return 2, err

	"zettelstore.de/z/web/adapter/webui"
	"zettelstore.de/z/web/server"
)

// ---------- Subcommand: run ------------------------------------------------

func flgRun(fs *flag.FlagSet) {
	fs.String("c", defConfigfile, "configuration file")
	fs.Uint("a", 0, "port number kernel service (0=disable)")
	fs.Uint("p", 23123, "port number web service")
	fs.String("d", "", "zettel directory")
	fs.Bool("r", false, "system-wide read-only mode")
	fs.Bool("v", false, "verbose mode")
	fs.Bool("debug", false, "debug mode")
}

	ucCreateZettel := usecase.NewCreateZettel(ucLog, rtConfig, protectedBoxManager)
	ucGetMeta := usecase.NewGetMeta(protectedBoxManager)
	ucGetAllMeta := usecase.NewGetAllMeta(protectedBoxManager)
	ucGetZettel := usecase.NewGetZettel(protectedBoxManager)
	ucParseZettel := usecase.NewParseZettel(rtConfig, ucGetZettel)
	ucEvaluate := usecase.NewEvaluate(rtConfig, ucGetZettel, ucGetMeta)
	ucListMeta := usecase.NewListMeta(protectedBoxManager)
	ucListRoles := usecase.NewListRole(protectedBoxManager)
	ucListTags := usecase.NewListTags(protectedBoxManager)
	ucZettelContext := usecase.NewZettelContext(protectedBoxManager, rtConfig)
	ucDelete := usecase.NewDeleteZettel(ucLog, protectedBoxManager)
	ucUpdate := usecase.NewUpdateZettel(ucLog, protectedBoxManager)
	ucRename := usecase.NewRenameZettel(ucLog, protectedBoxManager)
	ucUnlinkedRefs := usecase.NewUnlinkedReferences(protectedBoxManager, rtConfig)
	ucRefresh := usecase.NewRefresh(ucLog, protectedBoxManager)
	ucVersion := usecase.NewVersion(kernel.Main.GetConfig(kernel.CoreService, kernel.CoreVersion).(string))

	webSrv.Handle("/", wui.MakeGetRootHandler(protectedBoxManager))

	// Web user interface
	if !authManager.IsReadonly() {
		webSrv.AddZettelRoute('b', server.MethodGet, wui.MakeGetRenameZettelHandler(
			ucGetMeta, &ucEvaluate))
		webSrv.AddZettelRoute('b', server.MethodPost, wui.MakePostRenameZettelHandler(&ucRename))
		webSrv.AddZettelRoute('c', server.MethodGet, wui.MakeGetCreateZettelHandler(
			ucGetZettel, &ucCreateZettel))
		webSrv.AddZettelRoute('c', server.MethodPost, wui.MakePostCreateZettelHandler(&ucCreateZettel))
		webSrv.AddZettelRoute('d', server.MethodGet, wui.MakeGetDeleteZettelHandler(
			ucGetMeta, ucGetAllMeta, &ucEvaluate))
		webSrv.AddZettelRoute('d', server.MethodPost, wui.MakePostDeleteZettelHandler(&ucDelete))
		webSrv.AddZettelRoute('e', server.MethodGet, wui.MakeEditGetZettelHandler(ucGetZettel))
		webSrv.AddZettelRoute('e', server.MethodPost, wui.MakeEditSetZettelHandler(&ucUpdate))
	}
	webSrv.AddListRoute('g', server.MethodGet, wui.MakeGetGoActionHandler(&ucRefresh))
	webSrv.AddListRoute('h', server.MethodGet, wui.MakeListHTMLMetaHandler(
		ucListMeta, ucListRoles, ucListTags, &ucEvaluate))
	webSrv.AddZettelRoute('h', server.MethodGet, wui.MakeGetHTMLZettelHandler(
		&ucEvaluate, ucGetMeta))

//-----------------------------------------------------------------------------
// Copyright (c) 2020-2021 Detlef Stern
//
// This file is part of zettelstore.
//
// Zettelstore 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 cmd

import (
	"flag"
	"sort"


	"zettelstore.de/z/logger"
)

// Command stores information about commands / sub-commands.
type Command struct {
	Name       string              // command name as it appears on the command line
	Func       CommandFunc         // function that executes a command

// Get returns the command identified by the given name and a bool to signal success.
func Get(name string) (Command, bool) {
	cmd, ok := commands[name]
	return cmd, ok
}

// List returns a sorted list of all registered command names.
func List() []string {
	result := make([]string, 0, len(commands))
	for name := range commands {
		result = append(result, name)
	}
	sort.Strings(result)
	return result
}

//-----------------------------------------------------------------------------
// Copyright (c) 2020-2022 Detlef Stern
//
// This file is part of zettelstore.
//
// Zettelstore 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 cmd

import (
	"errors"
	"flag"
	"fmt"
	"net"
	"net/url"
	"os"

	"strconv"
	"strings"

	"zettelstore.de/c/api"
	"zettelstore.de/z/auth"
	"zettelstore.de/z/auth/impl"
	"zettelstore.de/z/box"
	"zettelstore.de/z/box/compbox"
	"zettelstore.de/z/box/manager"
	"zettelstore.de/z/config"
	"zettelstore.de/z/domain/id"
	"zettelstore.de/z/domain/meta"
	"zettelstore.de/z/input"
	"zettelstore.de/z/kernel"
	"zettelstore.de/z/logger"
	"zettelstore.de/z/web/server"
)

const (
	defConfigfile = ".zscfg"
)

func init() {
	RegisterCommand(Command{
		Name: "help",
		Func: func(*flag.FlagSet) (int, error) {
			fmt.Println("Available commands:")
			for _, name := range List() {

		Func:       runFunc,
		Boxes:      true,
		Header:     true,
		LineServer: true,
		SetFlags:   flgRun,
	})
	RegisterCommand(Command{
		Name:   "run-simple",
		Func:   runFunc,
		Simple: true,
		Boxes:  true,
		Header: true,
		// LineServer: true,
		SetFlags: func(fs *flag.FlagSet) {
			// fs.Uint("a", 0, "port number kernel service (0=disable)")

	})
	RegisterCommand(Command{
		Name: "password",
		Func: cmdPassword,
	})
}

func readConfig(fs *flag.FlagSet) (cfg *meta.Meta) {
	var configFile string
	if configFlag := fs.Lookup("c"); configFlag != nil {
		configFile = configFlag.Value.String()


	} else {


		configFile = defConfigfile
	}
	content, err := os.ReadFile(configFile)

	if err != nil {
		return meta.New(id.Invalid)
	}
	return meta.NewFromInput(id.Invalid, input.NewInput(content))
}












func getConfig(fs *flag.FlagSet) *meta.Meta {
	cfg := readConfig(fs)
	fs.Visit(func(flg *flag.Flag) {
		switch flg.Name {
		case "p":
			if portStr, err := parsePort(flg.Value.String()); err == nil {
				cfg.Set(keyListenAddr, net.JoinHostPort("127.0.0.1", portStr))
			}
		case "a":

const (
	keyAdminPort         = "admin-port"
	keyDebug             = "debug-mode"
	keyDefaultDirBoxType = "default-dir-box-type"
	keyInsecureCookie    = "insecure-cookie"
	keyListenAddr        = "listen-addr"
	keyLogLevel          = "log-level"

	keyOwner             = "owner"
	keyPersistentCookie  = "persistent-cookie"
	keyBoxOneURI         = kernel.BoxURIs + "1"
	keyReadOnly          = "read-only-mode"
	keyTokenLifetimeHTML = "token-lifetime-html"
	keyTokenLifetimeAPI  = "token-lifetime-api"
	keyURLPrefix         = "url-prefix"

	ok = setConfigValue(
		ok, kernel.WebService, kernel.WebListenAddress,
		cfg.GetDefault(keyListenAddr, "127.0.0.1:23123"))
	ok = setConfigValue(ok, kernel.WebService, kernel.WebURLPrefix, cfg.GetDefault(keyURLPrefix, "/"))
	ok = setConfigValue(ok, kernel.WebService, kernel.WebSecureCookie, !cfg.GetBool(keyInsecureCookie))
	ok = setConfigValue(ok, kernel.WebService, kernel.WebPersistentCookie, cfg.GetBool(keyPersistentCookie))



	ok = setConfigValue(
		ok, kernel.WebService, kernel.WebTokenLifetimeAPI, cfg.GetDefault(keyTokenLifetimeAPI, ""))
	ok = setConfigValue(
		ok, kernel.WebService, kernel.WebTokenLifetimeHTML, cfg.GetDefault(keyTokenLifetimeHTML, ""))

	if !ok {
		return errors.New("unable to set configuration")

			compbox.Setup(cfg)
			return manager.New(boxURIs, authManager, rtConfig)
		}
	} else {
		createManager = func([]*url.URL, auth.Manager, config.Config) (box.Manager, error) { return nil, nil }
	}







	kern.SetCreators(
		func(readonly bool, owner id.Zid) (auth.Manager, error) {
			return impl.New(readonly, owner, cfg.GetDefault("secret", "")), nil
		},
		createManager,
		func(srv server.Server, plMgr box.Manager, authMgr auth.Manager, rtConfig config.Config) error {
			setupRouting(srv, plMgr, authMgr, rtConfig)
			return nil
		},
	)

	kern.Shutdown(true)
	return exitCode
}

// runSimple is called, when the user just starts the software via a double click
// or via a simple call ``./zettelstore`` on the command line.
func runSimple() int {



	dir := "./zettel"
	if err := os.MkdirAll(dir, 0750); err != nil {
		fmt.Fprintf(os.Stderr, "Unable to create zettel directory %q (%s)\n", dir, err)
		return 1
	}
	return executeCommand("run-simple", "-d", dir)
}

var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to `file`")
var memprofile = flag.String("memprofile", "", "write memory profile to `file`")

// Main is the real entrypoint of the zettelstore.
func Main(progName, buildVersion string) int {

	kernel.Main.SetConfig(kernel.CoreService, kernel.CoreProgname, progName)
	kernel.Main.SetConfig(kernel.CoreService, kernel.CoreVersion, buildVersion)
	flag.Parse()
	if *cpuprofile != "" || *memprofile != "" {
		if *cpuprofile != "" {
			kernel.Main.StartProfiling(kernel.ProfileCPU, *cpuprofile)
		} else {
			kernel.Main.StartProfiling(kernel.ProfileHead, *memprofile)
		}
		defer kernel.Main.StopProfiling()
	}
	args := flag.Args()
	if len(args) == 0 {
		return runSimple()
	}
	return executeCommand(args[0], args[1:]...)
}

import (
	_ "zettelstore.de/z/box/compbox"       // Allow to use computed box.
	_ "zettelstore.de/z/box/constbox"      // Allow to use global internal box.
	_ "zettelstore.de/z/box/dirbox"        // Allow to use directory box.
	_ "zettelstore.de/z/box/filebox"       // Allow to use file box.
	_ "zettelstore.de/z/box/membox"        // Allow to use in-memory box.
	_ "zettelstore.de/z/encoder/htmlenc"   // Allow to use HTML encoder.
	_ "zettelstore.de/z/encoder/nativeenc" // Allow to use native encoder.
	_ "zettelstore.de/z/encoder/textenc"   // Allow to use text encoder.
	_ "zettelstore.de/z/encoder/zjsonenc"  // Allow to use ZJSON encoder.
	_ "zettelstore.de/z/encoder/zmkenc"    // Allow to use zmk encoder.
	_ "zettelstore.de/z/kernel/impl"       // Allow kernel implementation to create itself
	_ "zettelstore.de/z/parser/blob"       // Allow to use BLOB parser.
	_ "zettelstore.de/z/parser/draw"       // Allow to use draw parser.
	_ "zettelstore.de/z/parser/markdown"   // Allow to use markdown parser.
	_ "zettelstore.de/z/parser/none"       // Allow to use none parser.
	_ "zettelstore.de/z/parser/plain"      // Allow to use plain parser.
	_ "zettelstore.de/z/parser/zettelmark" // Allow to use zettelmark parser.
)

//-----------------------------------------------------------------------------
// Copyright (c) 2020-2021 Detlef Stern
//
// This file is part of zettelstore.
//
// Zettelstore 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 config provides functions to retrieve runtime configuration data.

	AuthConfig

	// AddDefaultValues enriches the given meta data with its default values.
	AddDefaultValues(m *meta.Meta) *meta.Meta

	// GetDefaultTitle returns the current value of the "default-title" key.
	GetDefaultTitle() string

	// GetDefaultRole returns the current value of the "default-role" key.
	GetDefaultRole() string

	// GetDefaultSyntax returns the current value of the "default-syntax" key.
	GetDefaultSyntax() string

	// GetDefaultLang returns the current value of the "default-lang" key.
	GetDefaultLang() string

	if cfg != nil {
		return cfg.GetDefaultTitle()
	}
	return "Untitled"
}

// GetRole returns the value of the "role" key of the given meta. If there
// is no such value, GetDefaultRole is returned.
func GetRole(m *meta.Meta, cfg Config) string {
	if val, ok := m.Get(api.KeyRole); ok {
		return val
	}
	return cfg.GetDefaultRole()
}

// GetSyntax returns the value of the "syntax" key of the given meta. If there
// is no such value, GetDefaultSyntax is returned.
func GetSyntax(m *meta.Meta, cfg Config) string {
	if val, ok := m.Get(api.KeySyntax); ok {
		return val

id: 00001004010000
title: Zettelstore startup configuration
role: manual
tags: #configuration #manual #zettelstore
syntax: zmk
modified: 20220304115353

The configuration file, as specified by the ''-c CONFIGFILE'' [[command line option|00001004051000]], allows you to specify some startup options.
These options cannot be stored in a [[configuration zettel|00001004020000]] because either they are needed before Zettelstore can start or because of security reasons.
For example, Zettelstore need to know in advance, on which network address is must listen or where zettel are stored.
An attacker that is able to change the owner can do anything.
Therefore only the owner of the computer on which Zettelstore runs can change this information.

; [!log-level|''log-level'']
: Specify the global [[logging level|00001004059700]] for the whole application, overwriting the level ""debug"" set by configuration [[''debug-mode''|#debug-mode]].
  Can be changed at runtime, even for specific internal services, with the ''log-level'' command of the [[administrator console|00001004101000#log-level]].
  
  Default: ""info"".

  When you are familiar to operate the Zettelstore, you might set the level to ""warn"" or ""error"" to receive less noisy messages from the Zettelstore.





; [!owner|''owner'']
: [[Identifier|00001006050000]] of a zettel that contains data about the owner of the Zettelstore.
  The owner has full authorization for the Zettelstore.
  Only if owner is set to some value, user [[authentication|00001010000000]] is enabled.



; [!persistent-cookie|''persistent-cookie'']
: A [[boolean value|00001006030500]] to make the access cookie persistent.
  This is helpful if you access the Zettelstore via a mobile device.
  On these devices, the operating system is free to stop the web browser and to remove temporary cookies.
  Therefore, an authenticated user will be logged off.

  If ""true"", a persistent cookie is used.
  Its lifetime exceeds the lifetime of the authentication token (see option ''token-lifetime-html'') by 30 seconds.

  Default: ""false""
; [!read-only-mode|''read-only-mode'']
: Puts the Zettelstore service into a read-only mode, if set to a [[true value|00001006030500]].
  No changes are possible.

  Default: ""false"".





; [!token-lifetime-api|''token-lifetime-api''], [!token-lifetime-html|''token-lifetime-html'']
: Define lifetime of access tokens in minutes.
  Values are only valid if authentication is enabled, i.e. key ''owner'' is set.

  ''token-lifetime-api'' is for accessing Zettelstore via its [[API|00001012000000]].
  Default: ""10"".

id: 00001004020000
title: Configure the running Zettelstore
role: manual
tags: #configuration #manual #zettelstore
syntax: zmk
modified: 20220304114412

You can configure a running Zettelstore by modifying the special zettel with the ID [[00000000000100]].
This zettel is called __configuration zettel__.
The following metadata keys change the appearance / behavior of Zettelstore:

; [!default-copyright|''default-copyright'']
: Copyright value to be used when rendering content.

  This value is also used to specify the language for all non-zettel content, e.g. lists or search results.

  Use values according to the language definition of [[RFC-5646|https://tools.ietf.org/html/rfc5646]].
; [!default-license|''default-license'']
: License value to be used when rendering content.
  Can be overwritten in a zettel with [[meta key|00001006020000]] ''license''.
  Default: (the empty string).
; [!default-role|''default-role'']
: Role to be used, if a zettel specifies no ''role'' [[meta key|00001006020000]].
  Default: ""zettel"".
; [!default-syntax|''default-syntax'']
: Syntax to be used, if a zettel specifies no ''syntax'' [[meta key|00001006020000]].
  Default: ""zmk"" (""[[Zettelmarkup|00001007000000]]"").
; [!default-title|''default-title'']
: Title to be used, if a zettel specifies no ''title'' [[meta key|00001006020000]].
  Default: ""Untitled"".

id: 00001004051200
title: The ''file'' sub-command
role: manual
tags: #command #configuration #manual #zettelstore
syntax: zmk
modified: 20220209114650

Reads zettel data from a file (or from standard input / stdin) and renders it to standard output / stdout.
This allows Zettelstore to render files manually.
```
zettelstore file [-t FORMAT] [file-1 [file-2]]
```

; ''-t FORMAT''
: Specifies the output format.
  Supported values are:
  [[''html''|00001012920510]] (default),
  [[''native''|00001012920513]],
  [[''text''|00001012920519]],
  [[''zjson''|00001012920503]],
  and [[''zmk''|00001012920522]].
; ''file-1''
: Specifies the file name, where at least metadata is read.
  If ''file-2'' is not given, the zettel content is also read from here.
; ''file-2''
: File name where the zettel content is stored.

If neither ''file-1'' nor ''file-2'' are given, metadata and zettel content are read from standard input / stdin.

id: 00001005090000
title: List of predefined zettel
role: manual
tags: #manual #reference #zettelstore
syntax: zmk
modified: 20211229000646

The following table lists all predefined zettel with their purpose.

|= Identifier :|= Title | Purpose
| [[00000000000001]] | Zettelstore Version | Contains the version string of the running Zettelstore
| [[00000000000002]] | Zettelstore Host | Contains the name of the computer running the Zettelstore
| [[00000000000003]] | Zettelstore Operating System | Contains the operating system and CPU architecture of the computer running the Zettelstore

| [[00000000010403]] | Zettelstore Form HTML Template | Form that is used to create a new or to change an existing zettel that contains text
| [[00000000010404]] | Zettelstore Rename Form HTML Template | View that is displayed to change the [[zettel identifier|00001006050000]]
| [[00000000010405]] | Zettelstore Delete HTML Template | View to confirm the deletion of a zettel
| [[00000000010500]] | Zettelstore List Roles HTML Template | Layout for listing all roles
| [[00000000010600]] | Zettelstore List Tags HTML Template | Layout of tags lists
| [[00000000020001]] | Zettelstore Base CSS | System-defined CSS file that is included by the [[Base HTML Template|00000000010100]]
| [[00000000025001]] | Zettelstore User CSS | User-defined CSS file that is included by the [[Base HTML Template|00000000010100]]

| [[00000000040001]] | Generic Emoji | Image that is shown if [[original image reference|00001007040322]] is invalid
| [[00000000090000]] | New Menu | Contains items that should contain in the zettel template menu
| [[00000000090001]] | New Zettel | Template for a new zettel with role ""[[zettel|00001006020100]]""
| [[00000000090002]] | New User | Template for a new [[user zettel|00001010040200]]
| [[00010000000000]] | Home | Default home zettel, contains some welcome information

If a zettel is not linked, it is not accessible for the current user.

**Important:** All identifier may change until a stable version of the software is released.

id: 00001006020000
title: Supported Metadata Keys
role: manual
tags: #manual #meta #reference #zettel #zettelstore
syntax: zmk
modified: 20220218130146

Although you are free to define your own metadata, by using any key (according to the [[syntax|00001006010000]]), some keys have a special meaning that is enforced by Zettelstore.
See the [[computed list of supported metadata keys|00000000000090]] for details.

Most keys conform to a [[type|00001006030000]].

; [!all-tags|''all-tags'']

; [!read-only|''read-only'']
: Marks a zettel as read-only.
  The interpretation of [[supported values|00001006020400]] for this key depends, whether authentication is [[enabled|00001010040100]] or not.
; [!role|''role'']
: Defines the role of the zettel.
  Can be used for selecting zettel.
  See [[supported zettel roles|00001006020100]].
  If not given, the value ''default-role'' from the [[configuration zettel|00001004020000#default-role]] will be used.
; [!syntax|''syntax'']
: Specifies the syntax that should be used for interpreting the zettel.
  The zettel about [[other markup languages|00001008000000]] defines supported values.
  If not given, the value ''default-syntax'' from the [[configuration zettel|00001004020000#default-syntax]] will be used.
; [!tags|''tags'']
: Contains a space separated list of tags to describe the zettel further.
  Each Tag must begin with the number sign character (""''#''"", U+0023).

id: 00001006020100
title: Supported Zettel Roles
role: manual
tags: #manual #meta #reference #zettel #zettelstore
syntax: zmk
modified: 20220214174553

The [[''role'' key|00001006020000#role]] defines what kind of zettel you are writing.
You are free to define your own roles.

The role ''zettel'' is predefined as the default role, but you can [[change this|00001004020000#default-role]].

Some roles are defined for technical reasons:

; [!configuration|''configuration'']
: A zettel that contains some configuration data for the Zettelstore.
  Most prominent is [[00000000000100]], as described in [[00001004020000]].
; [!manual|''manual'']

id: 00001006055000
title: Reserved zettel identifier
role: manual
tags: #design #manual #zettelstore
syntax: zmk
modified: 20211124182600

[[Zettel identifier|00001006050000]] are typically created by examine the current date and time.
By renaming a zettel, you are able to provide any sequence of 14 digits.
If no other zettel has the same identifier, you are allowed to rename a zettel.

To make things easier, you normally should not use zettel identifier that begin with four zeroes (''0000'').

| 00009000000000 | 0000999999999 | Reserved for applications

This list may change in the future.

==== External Applications
|= From | To | Description
| 00009000001000 | 00009000001999 | [[Zettel Presenter|https://zettelstore.de/contrib]], an application to display zettel as a HTML-based slideshow

id: 00001007030000
title: Zettelmarkup: Block-Structured Elements
role: manual
tags: #manual #zettelmarkup #zettelstore
syntax: zmk
modified: 20220201133655

Every markup for blocks-structured elements (""blocks"") begins at the very first position of a line.

There are five kinds of blocks: lists, one-line blocks, line-range blocks, tables, and paragraphs.

=== Lists

Additionally, all other blocks elements are allowed in line-range blocks.

* [[Verbatim blocks|00001007030500]] do not interpret their content,
* [[Quotation blocks|00001007030600]] specify a block-length quotations,
* [[Verse blocks|00001007030700]] allow to enter poetry, lyrics and similar text, where line endings are important,
* [[Region blocks|00001007030800]] just mark regions, e.g. for common formatting,
* [[Comment blocks|00001007030900]] allow to enter text that will be ignored when rendered.


* [[Inline-Zettel blocks|00001007031200]] provide a mechanism to specify zettel content with a new syntax without creating a new zettel.

=== Tables

Similar to lists are tables not specified explicitly.
A sequence of table rows is considered a [[table|00001007031000]].
A table row itself is a sequence of table cells.

id: 00001007030800
title: Zettelmarkup: Region Blocks
role: manual
tags: #manual #zettelmarkup #zettelstore
syntax: zmk
modified: 20220218131131

Region blocks does not directly have a visual representation.
They just group a range of lines.
You can use region blocks to enter [[attributes|00001007050000]] that apply only to this range of lines.
One example is to enter a multi-line warning that should be visible.

This kind of line-range block begins with at least three colon characters (""'':''"", U+003A) at the first position of a line[^Since a [[description text|00001007030100]] only use exactly one colon character at the first position of a line, there is no possible ambiguity between these elements.].
You can add some [[attributes|00001007050000]] on the beginning line of a region block, following the initiating characters.
The region block does not support the default attribute, but it supports the generic attribute.
Some generic attributes, like ``=note``, ``=warning`` will be rendered special.

Attributes are interpreted on HTML rendering.
Any other character in this line will be ignored.

Text following the beginning line will be interpreted, until a line begins with at least the same number of the same characters given at the beginning line.
This allows to enter a region block within a region block.
At the ending line, you can enter some [[inline elements|00001007040000]] after the colon characters.
These will interpreted as some attribution text.

Generic attributes that are result in a special HTML rendering are:
* example
* note
* tip
* important
* caution
* warning

id: 00001007031200
title: Zettelmarkup: Inline-Zettel Block
role: manual
tags: #manual #zettelmarkup #zettelstore
syntax: zmk
modified: 20220218172121

An inline-zettel block allows to specify some content with another syntax without creating a new zettel.
This is useful, for example, if you want to specify a [[simple drawing|00001008050000]] within your zettel and you are sure that you do not need the drawing in another context.
Another example is to embed some [[Markdown|00001008010500]] content, because you are too lazy to translate Markdown into Zettelmarkup.[^However, translating into Zettelmarkup is quite easy with the [[zmk encoder|00001012920522]].]
A last example is to specify HTML code to use it for some kind of web frontend framework.

As all other [[line-range blocks|00001007030000#line-range-blocks]], an inline-zettel block begins with at least three identical characters, starting at the first position of a line.
For inline-zettel blocks, the at-sign character (""''@''"", U+0040) is used.

You can add some [[attributes|00001007050000]] on the beginning line of a verbatim block, following the initiating characters.
The inline-zettel block uses the attribute key ""syntax"" to specify the [[syntax|00001008000000]] of the inline-zettel.
Alternatively, you can use the generic attribute to specify the syntax value.
If no value is provided, ""draw"" is assumed.

Any other character in this first line will be ignored.

Text following the beginning line will not be interpreted, until a line begins with at least the same number of the same at-sign characters given at the beginning line.
This allows to enter some at-sign characters in the text that should not be interpreted at this level.

Some examples:
```zmk
@@@draw
+-------+      +-------+
| Box 1 | ---> | Box 2 |
+-------+      +-------+
@@@
```
This will be rendered as:
:::example
@@@draw
+-------+      +-------+
| Box 1 | ---> | Box 2 |
+-------+      +-------+
@@@
:::

Using Markdown syntax:
```zmk
@@@markdown
A link to [this](00001007031200) zettel.
@@@
```
will be rendered as:
:::example
@@@markdown

id: 00001007040200
title: Zettelmarkup: Literal-like formatting
role: manual
tags: #manual #zettelmarkup #zettelstore
syntax: zmk
modified: 20220218131420

There are some reasons to mark text that should be rendered as uninterpreted:
* Mark text as literal, sometimes as part of a program.
* Mark text as input you give into a computer via a keyboard.
* Mark text as output from some computer, e.g. shown at the command line.

=== Literal text

Attributes can be specified, the default attribute has the same semantic as for literal text.

=== Inline-zettel snippet
To specify an inline snippet in a different [[syntax|00001008000000]], delimit your text with two at-sign characters (""''@''"", U+0040) on each side.

You can add some [[attributes|00001007050000]] immediate after the two closing at-sign characters to specify the syntax to use.
Either use the attribute key ""syntax"" or use the generic attribute to specify the syntax value.
If no value is provided, ""draw"" is assumed.

Examples:
* ``A @@-->@@ B`` renders in HTML as ::A @@-->@@ B::{=example}.
* ``@@<small>@@{=html}Small@@</small>@@{=html}`` renders in HTML as ::@@<small>@@{=html}Small@@</small>@@{=html}::{=example}.

To some degree, an inline-zettel snippet is the @@<small>@@{=html}smaller@@</small>@@{=html} sibling of the [[inline-zettel block|00001007031200]].
For HTML syntax, the same rules apply.

id: 00001007040324
title: Zettelmarkup: Inline-mode Transclusion
role: manual
tags: #manual #zettelmarkup #zettelstore
syntax: zmk
modified: 20220131155955

Inline-mode transclusion applies to all zettel that are parsed in a non-trivial way, e.g. as structured textual content.
For example, textual content is assumed if the [[syntax|00001006020000#syntax]] of a zettel is ""zmk"" ([[Zettelmarkup|00001007000000]]), or ""markdown"" / ""md"" ([[Markdown|00001008010000]]).
If the syntax is ""[[draw|00001008050000]]"", it is also a non-trivial way.

Since this type of transclusion is at the level of [[inline-structured elements|00001007040000]], the transclude specification must be replaced with some inline-structured elements.

First, the referenced zettel is read.
If it contains other transclusions, these will be expanded, recursively.
When an endless recursion is detected, expansion does not take place.
Instead an error message replaces the transclude specification.

id: 00001007060000
title: Zettelmarkup: Summary of Formatting Characters
role: manual
tags: #manual #reference #zettelmarkup #zettelstore
syntax: zmk
modified: 20220218124943

The following table gives an overview about the use of all characters that begin a markup element.

|= Character :|= [[Blocks|00001007030000]] <|= [[Inlines|00001007040000]] <
| ''!''  | (free) | (free)
| ''"''  | [[Verse block|00001007030700]] | [[Short inline quote|00001007040100]]
| ''#''  | [[Ordered list|00001007030200]] | [[Tag|00001007040000]]

| ''/''  | (free) | (free)
| '':''  | [[Region block|00001007030800]] / [[description text|00001007030100]] | [[Inline region|00001007040100]]
| '';''  | [[Description term|00001007030100]] | [[Small text|00001007040100]]
| ''<''  | [[Quotation block|00001007030600]] | (free)
| ''=''  | [[Headings|00001007030300]] | [[Computer output|00001007040200]]
| ''>''  | [[Quotation lists|00001007030200]] | [[Inserted text|00001007040100]]
| ''?''  | (free) | (free)
| ''@''  | [[Inline-Zettel blocks|00001007031200]] | [[Inline-zettel snippets|00001007040200#inline-zettel-snippet]]
| ''[''  | (reserved)  | [[Linked material|00001007040300]], [[citation key|00001007040300]], [[footnote|00001007040300]], [[mark|00001007040300]]
| ''\\'' | (blocked by inline meaning) | [[Escape character|00001007040000]]
| '']''  | (reserved) | End of [[link|00001007040300]], [[citation key|00001007040300]], [[footnote|00001007040300]], [[mark|00001007040300]]
| ''^''  | (free) | [[Superscripted text|00001007040100]]
| ''_''  | (free) | [[Emphasized text|00001007040100]]
| ''`''  | [[Verbatim block|00001007030500]] | [[Literal text|00001007040200]]
| ''{''  | [[Transclusion|00001007031100]] | [[Embedded material|00001007040300]], [[Attribute|00001007050000]]
| ''|''  | [[Table row / table cell|00001007031000]] | Separator within link and [[embed|00001007040320]] formatting
| ''}''  | End of [[Transclusion|00001007031100]] | End of embedded material, End of Attribute
| ''~''  | (free) | [[Deleted text|00001007040100]]

id: 00001008000000
title: Other Markup Languages
role: manual
tags: #manual #zettelstore
syntax: zmk
modified: 20220214180202

[[Zettelmarkup|00001007000000]] is not the only markup language you can use to define your content.
Zettelstore is quite agnostic with respect to markup languages.
Of course, Zettelmarkup plays an important role.
However, with the exception of zettel titles, you can use any (markup) language that is supported:

* CSS
* HTML template data
* Image formats: GIF, PNG, JPEG, SVG
* Markdown
* Plain text, not further interpreted

The [[metadata key|00001006020000#syntax]] ""''syntax''"" specifies which language should be used.
If it is not given, the key ""''default-syntax''"" will be used (specified in the [[configuration zettel|00001004020000#default-syntax]]).
The following syntax values are supported:

; [!css|''css'']
: A [[Cascading Style Sheet|https://www.w3.org/Style/CSS/]], to be used when rendering a zettel as HTML.
; [!draw|''draw'']
: A simple [[language|00001008050000]] to ""draw"" a graphic by using some simple Unicode characters.
; [!gif|''gif'']; [!jpeg|''jpeg'']; [!jpg|''jpg'']; [!png|''png'']
: The formats for pixel graphics.
  Typically the data is stored in a separate file and the syntax is given in the metafile, which has the same name as the zettel identifier and has no file extension.[^Before version 0.2.0, the metafile had the file extension ''.meta'']
; [!html|''html'']
: Hypertext Markup Language, will not be parsed further.
  Instead, it is treated as [[text|#text]], but will be encoded differently for [[HTML format|00001012920510]] (same for the [[web user interface|00001014000000]]).

  For security reasons, equivocal elements will not be encoded in the HTML format / web user interface, e.g. the ``<script ...`` tag.
  See [[security aspects of Markdown|00001008010000#security-aspects]] for some details.
; [!markdown|''markdown''], [!md|''md'']

: Just plain text that must not be interpreted further.
; [!zmk|''zmk'']
: [[Zettelmarkup|00001007000000]].

The actual values are also listed in a zettel named [[Zettelstore Supported Parser|00000000000092]].

If you specify something else, your content will be interpreted as plain text.

id: 00001008050000
title: The ""draw"" language
role: manual
tags: #graphic #manual #zettelstore
syntax: zmk
modified: 20220217180713

Sometimes, ""a picture is worth a thousand words"".
To create some graphical representations, Zettelstore provides a simple mechanism.
Characters like ""''|''"" or ""''-''"" already provide some visual feedback.
For example, to create a picture containing two boxes that are connected via an arrow, the following representation is possible:
```

+-------+       +-------+
| Box 1 | ----> | Box 2 |
+-------+       +-------+

```
Zettelstore translates this to:
@@@draw
+-------+       +-------+
| Box 1 | ----> | Box 2 |
+-------+       +-------+

@@@

Technically spoken, the drawing is translated to a [[SVG|00001008000000#svg]] element.

The following characters are interpreted to create a graphical representation.
Some of them will start a path that results in a recognized object.

|=Character:|Meaning|Path Start:

id: 00001010040100
title: Enable authentication
role: manual
tags: #authentication #configuration #manual #security #zettelstore
syntax: zmk


To enable authentication, you must create a zettel that stores [[authentication data|00001010040200]] for the owner.
Then you must reference this zettel within the [[startup configuration|00001004010000#owner]] under the key ''owner''.
Once the startup configuration contains a valid [[zettel identifier|00001006050000]] under that key, authentication is enabled.

id: 00001012053200
title: API: Create a new zettel
role: manual
tags: #api #manual #zettelstore
syntax: zmk
modified: 20211124180030

A zettel is created by adding it to the [[list of zettel|00001012000000#zettel-lists]].
Therefore, the [[endpoint|00001012920000]] to create a new zettel is also ''/j'', but you must send the data of the new zettel via a HTTP POST request.

The body of the POST request must contain a JSON object that specifies metadata and content of the zettel to be created.
The following keys of the JSON object are used:
; ''"meta"''

  Typically, text content is not encoded, and binary content is encoded via Base64.

Other keys will be ignored.
Even these three keys are just optional.
The body of the HTTP POST request must not be empty and it must contain a JSON object.

Therefore, a body containing just ''{}'' is perfectly valid.
The new zettel will have no content, its title will be set to the value of [[''default-title''|00001004020000#default-title]] (default: ""Untitled""), its role is set to the value of [[''default-role''|00001004020000#default-role]] (default: ""zettel""), and its syntax is set to the value of [[''default-syntax''|00001004020000#default-syntax]] (default: ""zmk"").

```
# curl -X POST --data '{}' http://127.0.0.1:23123/j
{"id":"20210713161000"}
```
If creating the zettel was successful, the HTTP response will contain a JSON object with one key:
; ''"id"''

id: 00001012053500
title: API: Retrieve evaluated metadata and content of an existing zettel in various encodings
role: manual
tags: #api #manual #zettelstore
syntax: zmk
modified: 20220301174012

The [[endpoint|00001012920000]] to work with evaluated metadata and content of a specific zettel is ''/v/{ID}'', where ''{ID}'' is a placeholder for the [[zettel identifier|00001006050000]].

For example, to retrieve some evaluated data about this zettel you are currently viewing, just send a HTTP GET request to the endpoint ''/v/00001012053500''[^If [[authentication is enabled|00001010040100]], you must include the a valid [[access token|00001012050200]] in the ''Authorization'' header].
If successful, the output is a JSON object:
```sh
# curl http://127.0.0.1:23123/v/00001012053500

<meta name="zs-backward" content="00001012000000">
<meta name="zs-box-number" content="1">
<meta name="copyright" content="(c) 2020-2021 by Detlef Stern <ds@zettelstore.de>">
<meta name="zs-forward" content="00001010040100 00001012050200 00001012920000 00001012920800">
<meta name="zs-lang" content="en">
<meta name="zs-published" content="00001012053500">
```

The optional query parameter ''_embed'' will embed all images into the returned encoding.

=== HTTP Status codes
; ''200''
: Retrieval was successful, the body contains an appropriate JSON object.
; ''400''
: Request was not valid. 
  There are several reasons for this.
  Maybe the zettel identifier did not consist of exactly 14 digits or ''_enc'' / ''_part'' contained illegal values.
; ''403''
: You are not allowed to retrieve data of the given zettel.
; ''404''
: Zettel not found.
  You probably used a zettel identifier that is not used in the Zettelstore.

id: 00001012920500
title: Encodings available via the [[API|00001012000000]]
role: manual
tags: #api #manual #reference #zettelstore
syntax: zmk
modified: 20220209114459

A zettel representation can be encoded in various formats for further processing.

* [[zjson|00001012920503]] (default)
* [[html|00001012920510]]
* [[native|00001012920513]]
* [[text|00001012920519]]

* [[zmk|00001012920522]]

id: 00001012920503
title: ZJSON Encoding
role: manual
tags: #api #manual #reference #zettelstore
syntax: zmk
modified: 20220223185826

A zettel representation that allows to process the syntactic structure of a zettel.
It is a JSON-based encoding format, but different to the structures returned by [[endpoint|00001012920000]] ''/j/{ID}''.

For an example, take a look at the JSON encoding of this page, which is available via the ""Info"" sub-page of this zettel: 

* [[//v/00001012920503?_enc=zjson&_part=zettel]],
* [[//v/00001012920503?_enc=zjson&_part=meta]],
* [[//v/00001012920503?_enc=zjson&_part=content]].

If transferred via HTTP, the content type will be ''application/json''.

id: 00001012920513
title: Native Encoding
role: manual
tags: #api #manual #reference #zettelstore
syntax: zmk
modified: 20210726193049

A zettel representation shows the structure of a zettel in a more user-friendly way.
Mostly used for debugging.

If transferred via HTTP, the content type will be ''text/plain''.

TODO: formal description

//-----------------------------------------------------------------------------
// Copyright (c) 2020-2021 Detlef Stern
//
// This file is part of zettelstore.
//
// Zettelstore 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 id provides domain specific types, constants, and functions about

	FormTemplateZid    = MustParse(api.ZidFormTemplate)
	RenameTemplateZid  = MustParse(api.ZidRenameTemplate)
	DeleteTemplateZid  = MustParse(api.ZidDeleteTemplate)
	ContextTemplateZid = MustParse(api.ZidContextTemplate)
	RolesTemplateZid   = MustParse(api.ZidRolesTemplate)
	TagsTemplateZid    = MustParse(api.ZidTagsTemplate)
	ErrorTemplateZid   = MustParse(api.ZidErrorTemplate)

	EmojiZid           = MustParse(api.ZidEmoji)
	TOCNewTemplateZid  = MustParse(api.ZidTOCNewTemplate)
	DefaultHomeZid     = MustParse(api.ZidDefaultHome)
)

const maxZid = 99999999999999

	"regexp"
	"sort"
	"strings"
	"unicode"
	"unicode/utf8"

	"zettelstore.de/c/api"

	"zettelstore.de/z/domain/id"
	"zettelstore.de/z/input"
	"zettelstore.de/z/strfun"
)

type keyUsage int

		return *d
	}
	return DescriptionKey{Type: Type(name)}
}

// GetSortedKeyDescriptions delivers all metadata key descriptions as a slice, sorted by name.
func GetSortedKeyDescriptions() []*DescriptionKey {
	names := make([]string, 0, len(registeredKeys))
	for n := range registeredKeys {
		names = append(names, n)
	}
	sort.Strings(names)
	result := make([]*DescriptionKey, 0, len(names))
	for _, n := range names {
		result = append(result, registeredKeys[n])
	}
	return result
}

// Supported keys.
func init() {

func init() {
	firstKeySet = strfun.NewSet(firstKeys...)
}

// Set stores the given string value under the given key.
func (m *Meta) Set(key, value string) {
	if key != api.KeyID {










		m.pairs[key] = trimValue(value)
	}
}

func trimValue(value string) string {
	return strings.TrimFunc(value, input.IsSpace)
}

// under this license.
//-----------------------------------------------------------------------------

// Package meta provides the domain specific type 'meta'.
package meta

import (
	"sort"
	"strings"

	"zettelstore.de/c/api"

	"zettelstore.de/z/domain/id"
	"zettelstore.de/z/input"
	"zettelstore.de/z/strfun"
)

// NewFromInput parses the meta data of a zettel.
func NewFromInput(zid id.Zid, inp *input.Input) *Meta {

	set := make(strfun.Set, len(newElems)+len(oldElems))
	addToSet(set, newElems, useElem)
	if len(set) == 0 {
		// Nothing to add. Maybe because of rejected elements.
		return
	}
	addToSet(set, oldElems, useElem)

	resultList := make([]string, 0, len(set))
	for tag := range set {
		resultList = append(resultList, tag)
	}
	sort.Strings(resultList)
	m.SetList(key, resultList)
}

func addData(m *Meta, k, v string) {
	if o, ok := m.Get(k); !ok || o == "" {
		m.Set(k, v)
	} else if v != "" {
		m.Set(k, o+" "+v)

//-----------------------------------------------------------------------------
// Copyright (c) 2020-2022 Detlef Stern
//
// This file is part of zettelstore.
//
// Zettelstore 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 meta_test provides tests for the domain specific type 'meta'.

import (
	"strconv"
	"strings"
	"sync"
	"time"

	"zettelstore.de/c/api"
	"zettelstore.de/c/zjson"
)

// DescriptionType is a description of a specific key type.
type DescriptionType struct {
	Name  string
	IsSet bool
}

	t := &DescriptionType{name, isSet}
	registeredTypes[name] = t
	return t
}

// Supported key types.
var (
	TypeCredential   = registerType(zjson.MetaCredential, false)
	TypeEmpty        = registerType(zjson.MetaEmpty, false)
	TypeID           = registerType(zjson.MetaID, false)
	TypeIDSet        = registerType(zjson.MetaIDSet, true)
	TypeNumber       = registerType(zjson.MetaNumber, false)
	TypeString       = registerType(zjson.MetaString, false)
	TypeTagSet       = registerType(zjson.MetaTagSet, true)
	TypeTimestamp    = registerType(zjson.MetaTimestamp, false)
	TypeURL          = registerType(zjson.MetaURL, false)
	TypeWord         = registerType(zjson.MetaWord, false)
	TypeWordSet      = registerType(zjson.MetaWordSet, true)
	TypeZettelmarkup = registerType(zjson.MetaZettelmarkup, false)
)

// Type returns a type hint for the given key. If no type hint is specified,
// TypeUnknown is returned.
func (*Meta) Type(key string) *DescriptionType {
	return Type(key)
}

	ErrNoWriteMeta    = errors.New("method WriteMeta is not implemented")
	ErrNoWriteContent = errors.New("method WriteContent is not implemented")
	ErrNoWriteBlocks  = errors.New("method WriteBlocks is not implemented")
	ErrNoWriteInlines = errors.New("method WriteInlines is not implemented")
)

// Create builds a new encoder with the given options.
func Create(enc api.EncodingEnum, env *Environment) Encoder {
	if info, ok := registry[enc]; ok {
		return info.Create(env)
	}
	return nil
}

// Info stores some data about an encoder.
type Info struct {
	Create  func(*Environment) Encoder
	Default bool
}

var registry = map[api.EncodingEnum]Info{}
var defEncoding api.EncodingEnum

// Register the encoder for later retrieval.
func Register(enc api.EncodingEnum, info Info) {
	if _, ok := registry[enc]; ok {
		panic(fmt.Sprintf("Encoder %q already registered", enc))
	}
	if info.Default {
		if defEncoding != api.EncoderUnknown && defEncoding != enc {
			panic(fmt.Sprintf("Default encoder already set: %q, new encoding: %q", defEncoding, enc))
		}
		defEncoding = enc
	}
	registry[enc] = info
}

// GetEncodings returns all registered encodings, ordered by encoding value.
func GetEncodings() []api.EncodingEnum {
	result := make([]api.EncodingEnum, 0, len(registry))
	for enc := range registry {
		result = append(result, enc)
	}
	return result
}

// GetDefaultEncoding returns the encoding that should be used as default.
func GetDefaultEncoding() api.EncodingEnum {
	if defEncoding != api.EncoderUnknown {
		return defEncoding
	}
	if _, ok := registry[api.EncoderZJSON]; ok {
		return api.EncoderZJSON
	}
	panic("No default encoding given")
}

			0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52,
			0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x08, 0x00, 0x00, 0x00, 0x00, 0x3a, 0x7e, 0x9b,
			0x55, 0x00, 0x00, 0x00, 0x0a, 0x49, 0x44, 0x41, 0x54, 0x78, 0x9c, 0x63, 0x62, 0x00, 0x00, 0x00,
			0x06, 0x00, 0x03, 0x36, 0x37, 0x7c, 0xa8, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae,
			0x42, 0x60, 0x82,
		},
		expect: expectMap{
			encoderZJSON:  `[{"":"BLOB","q":"PNG","s":"png","o":"iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAAAAAA6fptVAAAACklEQVR4nGNiAAAABgADNjd8qAAAAABJRU5ErkJggg=="}]`,
			encoderHTML:   `<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAAAAAA6fptVAAAACklEQVR4nGNiAAAABgADNjd8qAAAAABJRU5ErkJggg==" title="PNG">`,
			encoderNative: `[BLOB "PNG" "png" "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAAAAAA6fptVAAAACklEQVR4nGNiAAAABgADNjd8qAAAAABJRU5ErkJggg=="]`,
			encoderText:   "",
			encoderZmk:    `%% Unable to display BLOB with title 'PNG' and syntax 'png'.`,
		},
	},
}

func TestBlob(t *testing.T) {
	m := meta.New(id.Invalid)
	m.Set(api.KeyTitle, "PNG")
	for testNum, tc := range pngTestCases {
		inp := input.NewInput(tc.blob)
		pe := &peBlocks{bs: parser.ParseBlocks(inp, m, "png")}
		checkEncodings(t, testNum, pe, tc.descr, tc.expect, "???")
	}
}

package encoder_test

var tcsBlock = []zmkTestCase{
	{
		descr: "Empty Zettelmarkup should produce near nothing",
		zmk:   "",
		expect: expectMap{
			encoderZJSON:  `[]`,
			encoderHTML:   "",
			encoderNative: ``,
			encoderText:   "",
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Simple text: Hello, world",
		zmk:   "Hello, world",
		expect: expectMap{
			encoderZJSON:  `[{"":"Para","i":[{"":"Text","s":"Hello,"},{"":"Space"},{"":"Text","s":"world"}]}]`,
			encoderHTML:   "<p>Hello, world</p>",
			encoderNative: `[Para Text "Hello,",Space,Text "world"]`,
			encoderText:   "Hello, world",
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Simple block comment",
		zmk:   "%%%\nNo\nrender\n%%%",
		expect: expectMap{
			encoderZJSON:  `[{"":"CommentBlock","s":"No\nrender"}]`,
			encoderHTML:   ``,
			encoderNative: `[CommentBlock "No\nrender"]`,
			encoderText:   ``,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Rendered block comment",
		zmk:   "%%%{-}\nRender\n%%%",
		expect: expectMap{
			encoderZJSON:  `[{"":"CommentBlock","a":{"-":""},"s":"Render"}]`,
			encoderHTML:   "<!--\nRender\n-->",
			encoderNative: `[CommentBlock ("",[-]) "Render"]`,
			encoderText:   ``,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Simple Heading",
		zmk:   `=== Top`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Heading","n":1,"s":"top","i":[{"":"Text","s":"Top"}]}]`,
			encoderHTML:   "<h2 id=\"top\">Top</h2>",
			encoderNative: `[Heading 1 #top Text "Top"]`,
			encoderText:   `Top`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Einfache Liste",
		zmk:   "* A\n* B\n* C",
		expect: expectMap{
			encoderZJSON: `[{"":"Bullet","c":[[{"":"Para","i":[{"":"Text","s":"A"}]}],[{"":"Para","i":[{"":"Text","s":"B"}]}],[{"":"Para","i":[{"":"Text","s":"C"}]}]]}]`,
			encoderHTML:  "<ul>\n<li>A</li>\n<li>B</li>\n<li>C</li>\n</ul>",
			encoderNative: `[BulletList
 [[Para Text "A"]],
 [[Para Text "B"]],
 [[Para Text "C"]]]`,
			encoderText: "A\nB\nC",
			encoderZmk:  useZmk,
		},
	},
	{
		descr: "Schachtelliste",
		zmk:   "* T1\n** T2\n* T3\n** T4\n* T5",
		expect: expectMap{
			encoderZJSON: `[{"":"Bullet","c":[[{"":"Para","i":[{"":"Text","s":"T1"}]},{"":"Bullet","c":[[{"":"Para","i":[{"":"Text","s":"T2"}]}]]}],[{"":"Para","i":[{"":"Text","s":"T3"}]},{"":"Bullet","c":[[{"":"Para","i":[{"":"Text","s":"T4"}]}]]}],[{"":"Para","i":[{"":"Text","s":"T5"}]}]]}]`,
			encoderHTML: `<ul>

<li>
<p>T1</p>
<ul>
<li>T2</li>
</ul>
</li>
<li>
<p>T3</p>
<ul>
<li>T4</li>
</ul>
</li>
<li>
<p>T5</p>
</li>
</ul>`,
			encoderNative: `[BulletList
 [[Para Text "T1"],
  [BulletList
   [[Para Text "T2"]]]],
 [[Para Text "T3"],
  [BulletList
   [[Para Text "T4"]]]],
 [[Para Text "T5"]]]`,
			encoderText: "T1\nT2\nT3\nT4\nT5",
			encoderZmk:  useZmk,
		},
	},
	{
		descr: "Zwei Listen hintereinander",
		zmk:   "* Item1.1\n* Item1.2\n* Item1.3\n\n* Item2.1\n* Item2.2",
		expect: expectMap{
			encoderZJSON: `[{"":"Bullet","c":[[{"":"Para","i":[{"":"Text","s":"Item1.1"}]}],[{"":"Para","i":[{"":"Text","s":"Item1.2"}]}],[{"":"Para","i":[{"":"Text","s":"Item1.3"}]}],[{"":"Para","i":[{"":"Text","s":"Item2.1"}]}],[{"":"Para","i":[{"":"Text","s":"Item2.2"}]}]]}]`,
			encoderHTML:  "<ul>\n<li>Item1.1</li>\n<li>Item1.2</li>\n<li>Item1.3</li>\n<li>Item2.1</li>\n<li>Item2.2</li>\n</ul>",
			encoderNative: `[BulletList
 [[Para Text "Item1.1"]],
 [[Para Text "Item1.2"]],
 [[Para Text "Item1.3"]],
 [[Para Text "Item2.1"]],
 [[Para Text "Item2.2"]]]`,
			encoderText: "Item1.1\nItem1.2\nItem1.3\nItem2.1\nItem2.2",
			encoderZmk:  "* Item1.1\n* Item1.2\n* Item1.3\n* Item2.1\n* Item2.2",
		},
	},
	{
		descr: "Simple horizontal rule",
		zmk:   `---`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Thematic"}]`,
			encoderHTML:   "<hr>",
			encoderNative: `[Hrule]`,
			encoderText:   ``,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "No list after paragraph",
		zmk:   "Text\n*abc",
		expect: expectMap{
			encoderZJSON:  `[{"":"Para","i":[{"":"Text","s":"Text"},{"":"Soft"},{"":"Text","s":"*abc"}]}]`,
			encoderHTML:   "<p>Text\n*abc</p>",
			encoderNative: `[Para Text "Text",Space,Text "*abc"]`,
			encoderText:   `Text *abc`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "A list after paragraph",
		zmk:   "Text\n# abc",
		expect: expectMap{
			encoderZJSON: `[{"":"Para","i":[{"":"Text","s":"Text"}]},{"":"Ordered","c":[[{"":"Para","i":[{"":"Text","s":"abc"}]}]]}]`,
			encoderHTML:  "<p>Text</p>\n<ol>\n<li>abc</li>\n</ol>",
			encoderNative: `[Para Text "Text"],
[OrderedList
 [[Para Text "abc"]]]`,
			encoderText: "Text\nabc",
			encoderZmk:  useZmk,
		},
	},
	{
		descr: "Simple Quote Block",
		zmk:   "<<<\nToBeOrNotToBe\n<<< Romeo",
		expect: expectMap{
			encoderZJSON: `[{"":"Excerpt","b":[{"":"Para","i":[{"":"Text","s":"ToBeOrNotToBe"}]}],"i":[{"":"Text","s":"Romeo"}]}]`,
			encoderHTML:  "<blockquote>\n<p>ToBeOrNotToBe</p>\n<cite>Romeo</cite>\n</blockquote>",
			encoderNative: `[QuoteBlock
 [[Para Text "ToBeOrNotToBe"]],
 [Cite Text "Romeo"]]`,
			encoderText: "ToBeOrNotToBe\nRomeo",
			encoderZmk:  useZmk,
		},
	},
	{
		descr: "Quote Block with multiple paragraphs",
		zmk:   "<<<\nToBeOr\n\nNotToBe\n<<< Romeo",
		expect: expectMap{
			encoderZJSON: `[{"":"Excerpt","b":[{"":"Para","i":[{"":"Text","s":"ToBeOr"}]},{"":"Para","i":[{"":"Text","s":"NotToBe"}]}],"i":[{"":"Text","s":"Romeo"}]}]`,
			encoderHTML:  "<blockquote>\n<p>ToBeOr</p>\n<p>NotToBe</p>\n<cite>Romeo</cite>\n</blockquote>",
			encoderNative: `[QuoteBlock
 [[Para Text "ToBeOr"],
  [Para Text "NotToBe"]],
 [Cite Text "Romeo"]]`,
			encoderText: "ToBeOr\nNotToBe\nRomeo",
			encoderZmk:  useZmk,
		},
	},
	{
		descr: "Verse block",
		zmk: `"""
A line
  another line
Back

Paragraph

    Spacy  Para
""" Author`,
		expect: expectMap{
			encoderZJSON:  "[{\"\":\"Poem\",\"b\":[{\"\":\"Para\",\"i\":[{\"\":\"Text\",\"s\":\"A\"},{\"\":\"Space\",\"s\":\"\u00a0\"},{\"\":\"Text\",\"s\":\"line\"},{\"\":\"Hard\"},{\"\":\"Space\",\"s\":\"\u00a0\u00a0\"},{\"\":\"Text\",\"s\":\"another\"},{\"\":\"Space\",\"s\":\"\u00a0\"},{\"\":\"Text\",\"s\":\"line\"},{\"\":\"Hard\"},{\"\":\"Text\",\"s\":\"Back\"}]},{\"\":\"Para\",\"i\":[{\"\":\"Text\",\"s\":\"Paragraph\"}]},{\"\":\"Para\",\"i\":[{\"\":\"Space\",\"s\":\"\u00a0\u00a0\u00a0\u00a0\"},{\"\":\"Text\",\"s\":\"Spacy\"},{\"\":\"Space\",\"s\":\"\u00a0\u00a0\"},{\"\":\"Text\",\"s\":\"Para\"}]}],\"i\":[{\"\":\"Text\",\"s\":\"Author\"}]}]",
			encoderHTML:   "<div>\n<p>A\u00a0line<br>\n\u00a0\u00a0another\u00a0line<br>\nBack</p>\n<p>Paragraph</p>\n<p>\u00a0\u00a0\u00a0\u00a0Spacy\u00a0\u00a0Para</p>\n<cite>Author</cite>\n</div>",
			encoderNative: "[VerseBlock\n [[Para Text \"A\",Space,Text \"line\",Break,Space 2,Text \"another\",Space,Text \"line\",Break,Text \"Back\"],\n  [Para Text \"Paragraph\"],\n  [Para Space 4,Text \"Spacy\",Space 2,Text \"Para\"]],\n [Cite Text \"Author\"]]",
			encoderText:   "A line\n another line\nBack\nParagraph\n Spacy Para\nAuthor",
			encoderZmk:    "\"\"\"\nA\u00a0line\\\n\u00a0\u00a0another\u00a0line\\\nBack\nParagraph\n\u00a0\u00a0\u00a0\u00a0Spacy\u00a0\u00a0Para\n\"\"\" Author",
		},
	},
	{
		descr: "Span Block",
		zmk: `:::
A simple
   span
and much more
:::`,
		expect: expectMap{
			encoderZJSON: `[{"":"Block","b":[{"":"Para","i":[{"":"Text","s":"A"},{"":"Space"},{"":"Text","s":"simple"},{"":"Soft"},{"":"Space"},{"":"Text","s":"span"},{"":"Soft"},{"":"Text","s":"and"},{"":"Space"},{"":"Text","s":"much"},{"":"Space"},{"":"Text","s":"more"}]}]}]`,
			encoderHTML:  "<div>\n<p>A simple\n span\nand much more</p>\n</div>",
			encoderNative: `[SpanBlock
 [[Para Text "A",Space,Text "simple",Space,Space 3,Text "span",Space,Text "and",Space,Text "much",Space,Text "more"]]]`,
			encoderText: `A simple  span and much more`,
			encoderZmk:  useZmk,
		},
	},
	{
		descr: "Simple Verbatim",
		zmk:   "```\nHello\nWorld\n```",
		expect: expectMap{
			encoderZJSON:  `[{"":"CodeBlock","s":"Hello\nWorld"}]`,
			encoderHTML:   "<pre><code>Hello\nWorld</code></pre>",

			encoderNative: `[CodeBlock "Hello\nWorld"]`,










			encoderText:   "Hello\nWorld",
			encoderZmk:    useZmk,











		},
	},
	{
		descr: "Simple Description List",
		zmk:   "; Zettel\n: Paper\n: Note\n; Zettelkasten\n: Slip box",
		expect: expectMap{
			encoderZJSON: `[{"":"Description","d":[{"i":[{"":"Text","s":"Zettel"}],"e":[[{"":"Para","i":[{"":"Text","s":"Paper"}]}],[{"":"Para","i":[{"":"Text","s":"Note"}]}]]},{"i":[{"":"Text","s":"Zettelkasten"}],"e":[[{"":"Para","i":[{"":"Text","s":"Slip"},{"":"Space"},{"":"Text","s":"box"}]}]]}]}]`,
			encoderHTML:  "<dl>\n<dt>Zettel</dt>\n<dd>Paper</dd>\n<dd>Note</dd>\n<dt>Zettelkasten</dt>\n<dd>Slip box</dd>\n</dl>",
			encoderNative: `[DescriptionList
 [Term [Text "Zettel"],
  [Description
   [Para Text "Paper"]],
  [Description
   [Para Text "Note"]]],
 [Term [Text "Zettelkasten"],
  [Description
   [Para Text "Slip",Space,Text "box"]]]]`,
			encoderText: "Zettel\nPaper\nNote\nZettelkasten\nSlip box",
			encoderZmk:  useZmk,
		},
	},
	{
		descr: "Simple Table",
		zmk:   "|c1|c2|c3\n|d1||d3",
		expect: expectMap{
			encoderZJSON: `[{"":"Table","p":[[],[[{"i":[{"":"Text","s":"c1"}]},{"i":[{"":"Text","s":"c2"}]},{"i":[{"":"Text","s":"c3"}]}],[{"i":[{"":"Text","s":"d1"}]},{"i":[]},{"i":[{"":"Text","s":"d3"}]}]]]}]`,
			encoderHTML: `<table>
<tbody>
<tr><td>c1</td><td>c2</td><td>c3</td></tr>

<tr><td>d1</td><td></td><td>d3</td></tr>
</tbody>
</table>`,
			encoderNative: `[Table
 [Row [Cell Default Text "c1"],[Cell Default Text "c2"],[Cell Default Text "c3"]],
 [Row [Cell Default Text "d1"],[Cell Default],[Cell Default Text "d3"]]]`,
			encoderText: "c1 c2 c3\nd1  d3",
			encoderZmk:  useZmk,
		},
	},
	{
		descr: "Table with alignment and comment",
		zmk: `|h1>|=h2|h3:|
|%--+---+---+
|<c1|c2|:c3|
|f1|f2|=f3`,
		expect: expectMap{
			encoderZJSON: `[{"":"Table","p":[[{"s":">","i":[{"":"Text","s":"h1"}]},{"i":[{"":"Text","s":"h2"}]},{"s":":","i":[{"":"Text","s":"h3"}]}],[[{"s":"<","i":[{"":"Text","s":"c1"}]},{"i":[{"":"Text","s":"c2"}]},{"s":":","i":[{"":"Text","s":"c3"}]}],[{"s":">","i":[{"":"Text","s":"f1"}]},{"i":[{"":"Text","s":"f2"}]},{"s":":","i":[{"":"Text","s":"=f3"}]}]]]}]`,
			encoderHTML: `<table>
<thead>
<tr><th class="right">h1</th><th>h2</th><th class="center">h3</th></tr>
</thead>
<tbody>
<tr><td class="left">c1</td><td>c2</td><td class="center">c3</td></tr>

<tr><td class="right">f1</td><td>f2</td><td class="center">=f3</td></tr>
</tbody>
</table>`,
			encoderNative: `[Table
 [Header [Cell Right Text "h1"],[Cell Default Text "h2"],[Cell Center Text "h3"]],
 [Row [Cell Left Text "c1"],[Cell Default Text "c2"],[Cell Center Text "c3"]],
 [Row [Cell Right Text "f1"],[Cell Default Text "f2"],[Cell Center Text "=f3"]]]`,
			encoderText: "h1 h2 h3\nc1 c2 c3\nf1 f2 =f3",
			encoderZmk: `|=h1>|=h2|=h3:
|<c1|c2|c3
|f1|f2|=f3`,
		},
	},
	{











		descr: "",
		zmk:   ``,
		expect: expectMap{
			encoderZJSON:  `[]`,
			encoderHTML:   ``,
			encoderNative: ``,
			encoderText:   "",
			encoderZmk:    useZmk,
		},
	},
}

// func TestEncoderBlock(t *testing.T) {
// 	executeTestCases(t, tcsBlock)
// }

package encoder_test

var tcsInline = []zmkTestCase{
	{
		descr: "Empty Zettelmarkup should produce near nothing (inline)",
		zmk:   "",
		expect: expectMap{
			encoderZJSON:  `[]`,
			encoderHTML:   "",
			encoderNative: ``,
			encoderText:   "",
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Simple text: Hello, world (inline)",
		zmk:   `Hello, world`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Text","s":"Hello,"},{"":"Space"},{"":"Text","s":"world"}]`,
			encoderHTML:   "Hello, world",
			encoderNative: `Text "Hello,",Space,Text "world"`,
			encoderText:   "Hello, world",
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Emphasized formatting",
		zmk:   "__emph__",
		expect: expectMap{
			encoderZJSON:  `[{"":"Emph","i":[{"":"Text","s":"emph"}]}]`,
			encoderHTML:   "<em>emph</em>",
			encoderNative: `Emph [Text "emph"]`,
			encoderText:   "emph",
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Strong formatting",
		zmk:   "**strong**",
		expect: expectMap{
			encoderZJSON:  `[{"":"Strong","i":[{"":"Text","s":"strong"}]}]`,
			encoderHTML:   "<strong>strong</strong>",
			encoderNative: `Strong [Text "strong"]`,
			encoderText:   "strong",
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Insert formatting",
		zmk:   ">>insert>>",
		expect: expectMap{
			encoderZJSON:  `[{"":"Insert","i":[{"":"Text","s":"insert"}]}]`,
			encoderHTML:   "<ins>insert</ins>",
			encoderNative: `Insert [Text "insert"]`,
			encoderText:   "insert",
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Delete formatting",
		zmk:   "~~delete~~",
		expect: expectMap{
			encoderZJSON:  `[{"":"Delete","i":[{"":"Text","s":"delete"}]}]`,
			encoderHTML:   "<del>delete</del>",
			encoderNative: `Delete [Text "delete"]`,
			encoderText:   "delete",
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Update formatting",
		zmk:   "~~old~~>>new>>",
		expect: expectMap{
			encoderZJSON:  `[{"":"Delete","i":[{"":"Text","s":"old"}]},{"":"Insert","i":[{"":"Text","s":"new"}]}]`,
			encoderHTML:   "<del>old</del><ins>new</ins>",
			encoderNative: `Delete [Text "old"],Insert [Text "new"]`,
			encoderText:   "oldnew",
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Superscript formatting",
		zmk:   "^^superscript^^",
		expect: expectMap{
			encoderZJSON:  `[{"":"Super","i":[{"":"Text","s":"superscript"}]}]`,
			encoderHTML:   `<sup>superscript</sup>`,
			encoderNative: `Super [Text "superscript"]`,
			encoderText:   `superscript`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Subscript formatting",
		zmk:   ",,subscript,,",
		expect: expectMap{
			encoderZJSON:  `[{"":"Sub","i":[{"":"Text","s":"subscript"}]}]`,
			encoderHTML:   `<sub>subscript</sub>`,
			encoderNative: `Sub [Text "subscript"]`,
			encoderText:   `subscript`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Quotes formatting",
		zmk:   `""quotes""`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Quote","i":[{"":"Text","s":"quotes"}]}]`,
			encoderHTML:   "<q>quotes</q>",
			encoderNative: `Quote [Text "quotes"]`,
			encoderText:   `quotes`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Quotes formatting (german)",
		zmk:   `""quotes""{lang=de}`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Quote","a":{"lang":"de"},"i":[{"":"Text","s":"quotes"}]}]`,
			encoderHTML:   `<q lang="de">quotes</q>`,
			encoderNative: `Quote ("",[lang="de"]) [Text "quotes"]`,
			encoderText:   `quotes`,
			encoderZmk:    `""quotes""{lang="de"}`,
		},
	},
	{
		descr: "Span formatting",
		zmk:   `::span::`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Span","i":[{"":"Text","s":"span"}]}]`,
			encoderHTML:   `<span>span</span>`,
			encoderNative: `Span [Text "span"]`,
			encoderText:   `span`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Code formatting",
		zmk:   "``code``",
		expect: expectMap{
			encoderZJSON:  `[{"":"Code","s":"code"}]`,
			encoderHTML:   `<code>code</code>`,
			encoderNative: `Code "code"`,
			encoderText:   `code`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Input formatting",
		zmk:   `''input''`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Input","s":"input"}]`,
			encoderHTML:   `<kbd>input</kbd>`,
			encoderNative: `Input "input"`,
			encoderText:   `input`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Output formatting",
		zmk:   `==output==`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Output","s":"output"}]`,
			encoderHTML:   `<samp>output</samp>`,


			encoderNative: `Output "output"`,









			encoderText:   `output`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Nested Span Quote formatting",
		zmk:   `::""abc""::{lang=fr}`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Span","a":{"lang":"fr"},"i":[{"":"Quote","i":[{"":"Text","s":"abc"}]}]}]`,
			encoderHTML:   `<span lang="fr"><q>abc</q></span>`,
			encoderNative: `Span ("",[lang="fr"]) [Quote [Text "abc"]]`,
			encoderText:   `abc`,
			encoderZmk:    `::""abc""::{lang="fr"}`,
		},
	},
	{
		descr: "Simple Citation",
		zmk:   `[@Stern18]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Cite","s":"Stern18"}]`,
			encoderHTML:   `Stern18`, // TODO
			encoderNative: `Cite "Stern18"`,
			encoderText:   ``,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "No comment",
		zmk:   `% comment`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Text","s":"%"},{"":"Space"},{"":"Text","s":"comment"}]`,











			encoderHTML:   `% comment`,
			encoderNative: `Text "%",Space,Text "comment"`,
			encoderText:   `% comment`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Line comment",
		zmk:   `%% line comment`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Comment","s":"line comment"}]`,
			encoderHTML:   `<!-- line comment -->`,
			encoderNative: `Comment "line comment"`,
			encoderText:   ``,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Comment after text",
		zmk:   `Text %% comment`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Text","s":"Text"},{"":"Comment","s":"comment"}]`,
			encoderHTML:   `Text <!-- comment -->`,

			encoderNative: `Text "Text",Comment "comment"`,










			encoderText:   `Text`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Simple footnote",
		zmk:   `[^footnote]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Footnote","i":[{"":"Text","s":"footnote"}]}]`,
			encoderHTML:   `<sup id="fnref:0"><a href="#fn:0" class="footnote-ref" role="doc-noteref">0</a></sup>`,
			encoderNative: `Footnote [Text "footnote"]`,
			encoderText:   `footnote`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Simple mark",
		zmk:   `[!mark]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Mark","s":"mark","q":"mark"}]`,
			encoderHTML:   `<a id="mark"></a>`,
			encoderNative: `Mark "mark" #mark`,
			encoderText:   ``,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Mark with text",
		zmk:   `[!mark|with text]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Mark","s":"mark","q":"mark","i":[{"":"Text","s":"with"},{"":"Space"},{"":"Text","s":"text"}]}]`,
			encoderHTML:   `<a id="mark">with text</a>`,
			encoderNative: `Mark "mark" #mark [Text "with",Space,Text "text"]`,
			encoderText:   `with text`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Dummy Link",
		zmk:   `[[abc]]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Link","q":"external","s":"abc"}]`,
			encoderHTML:   `<a href="abc" class="external">abc</a>`,
			encoderNative: `Link EXTERNAL "abc"`,
			encoderText:   ``,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Simple URL",
		zmk:   `[[https://zettelstore.de]]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Link","q":"external","s":"https://zettelstore.de"}]`,
			encoderHTML:   `<a href="https://zettelstore.de" class="external">https://zettelstore.de</a>`,
			encoderNative: `Link EXTERNAL "https://zettelstore.de"`,
			encoderText:   ``,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "URL with Text",
		zmk:   `[[Home|https://zettelstore.de]]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Link","q":"external","s":"https://zettelstore.de","i":[{"":"Text","s":"Home"}]}]`,
			encoderHTML:   `<a href="https://zettelstore.de" class="external">Home</a>`,
			encoderNative: `Link EXTERNAL "https://zettelstore.de" [Text "Home"]`,
			encoderText:   `Home`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Simple Zettel ID",
		zmk:   `[[00000000000100]]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Link","q":"zettel","s":"00000000000100"}]`,
			encoderHTML:   `<a href="00000000000100">00000000000100</a>`,
			encoderNative: `Link ZETTEL "00000000000100"`,
			encoderText:   ``,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Zettel ID with Text",
		zmk:   `[[Config|00000000000100]]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Link","q":"zettel","s":"00000000000100","i":[{"":"Text","s":"Config"}]}]`,
			encoderHTML:   `<a href="00000000000100">Config</a>`,
			encoderNative: `Link ZETTEL "00000000000100" [Text "Config"]`,
			encoderText:   `Config`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Simple Zettel ID with fragment",
		zmk:   `[[00000000000100#frag]]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Link","q":"zettel","s":"00000000000100#frag"}]`,
			encoderHTML:   `<a href="00000000000100#frag">00000000000100#frag</a>`,
			encoderNative: `Link ZETTEL "00000000000100#frag"`,
			encoderText:   ``,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Zettel ID with Text and fragment",
		zmk:   `[[Config|00000000000100#frag]]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Link","q":"zettel","s":"00000000000100#frag","i":[{"":"Text","s":"Config"}]}]`,
			encoderHTML:   `<a href="00000000000100#frag">Config</a>`,
			encoderNative: `Link ZETTEL "00000000000100#frag" [Text "Config"]`,
			encoderText:   `Config`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Fragment link to self",
		zmk:   `[[#frag]]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Link","q":"self","s":"#frag"}]`,
			encoderHTML:   `<a href="#frag">#frag</a>`,
			encoderNative: `Link SELF "#frag"`,
			encoderText:   ``,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Hosted link",
		zmk:   `[[H|/hosted]]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Link","q":"local","s":"/hosted","i":[{"":"Text","s":"H"}]}]`,
			encoderHTML:   `<a href="/hosted">H</a>`,
			encoderNative: `Link LOCAL "/hosted" [Text "H"]`,
			encoderText:   `H`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Based link",
		zmk:   `[[B|/based]]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Link","q":"local","s":"/based","i":[{"":"Text","s":"B"}]}]`,
			encoderHTML:   `<a href="/based">B</a>`,
			encoderNative: `Link LOCAL "/based" [Text "B"]`,
			encoderText:   `B`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Relative link",
		zmk:   `[[R|../relative]]`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Link","q":"local","s":"../relative","i":[{"":"Text","s":"R"}]}]`,
			encoderHTML:   `<a href="../relative">R</a>`,
			encoderNative: `Link LOCAL "../relative" [Text "R"]`,
			encoderText:   `R`,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "Dummy Embed",
		zmk:   `{{abc}}`,
		expect: expectMap{
			encoderZJSON:  `[{"":"Embed","s":"abc"}]`,
			encoderHTML:   `<img src="abc" alt="">`,
			encoderNative: `Embed EXTERNAL "abc"`,
			encoderText:   ``,
			encoderZmk:    useZmk,
		},
	},
	{
		descr: "",
		zmk:   ``,
		expect: expectMap{
			encoderZJSON:  `[]`,
			encoderHTML:   ``,
			encoderNative: ``,
			encoderText:   ``,
			encoderZmk:    useZmk,
		},
	},
}

package encoder_test

import (
	"bytes"
	"fmt"
	"testing"


	"zettelstore.de/c/api"

	"zettelstore.de/z/ast"
	"zettelstore.de/z/encoder"
	"zettelstore.de/z/input"
	"zettelstore.de/z/parser"

	_ "zettelstore.de/z/encoder/htmlenc"   // Allow to use HTML encoder.
	_ "zettelstore.de/z/encoder/nativeenc" // Allow to use native encoder.
	_ "zettelstore.de/z/encoder/textenc"   // Allow to use text encoder.
	_ "zettelstore.de/z/encoder/zjsonenc"  // Allow to use ZJSON encoder.
	_ "zettelstore.de/z/encoder/zmkenc"    // Allow to use zmk encoder.
	"zettelstore.de/z/parser/cleaner"
	_ "zettelstore.de/z/parser/zettelmark" // Allow to use zettelmark parser.
)

type zmkTestCase struct {
	descr  string
	zmk    string
	inline bool
	expect expectMap
}

type expectMap map[api.EncodingEnum]string

const useZmk = "\000"

const (
	encoderZJSON  = api.EncoderZJSON
	encoderHTML   = api.EncoderHTML
	encoderNative = api.EncoderNative
	encoderText   = api.EncoderText
	encoderZmk    = api.EncoderZmk
)

func TestEncoder(t *testing.T) {
	for i := range tcsInline {
		tcsInline[i].inline = true
	}
	executeTestCases(t, append(tcsBlock, tcsInline...))

			is := parser.ParseInlines(inp, api.ValueSyntaxZmk)
			cleaner.CleanInlineSlice(&is)
			pe = &peInlines{is: is}
		} else {
			pe = &peBlocks{bs: parser.ParseBlocks(inp, nil, api.ValueSyntaxZmk)}
		}
		checkEncodings(t, testNum, pe, tc.descr, tc.expect, tc.zmk)

	}
}

func checkEncodings(t *testing.T, testNum int, pe parserEncoder, descr string, expected expectMap, zmkDefault string) {
	t.Helper()
	for enc, exp := range expected {
		encdr := encoder.Create(enc, nil)
		got, err := pe.encode(encdr)
		if err != nil {
			t.Error(err)
			continue
		}
		if enc == api.EncoderZmk && exp == "\000" {
			exp = zmkDefault
		}
		if got != exp {
			prefix := fmt.Sprintf("Test #%d", testNum)
			if d := descr; d != "" {
				prefix += "\nReason:   " + d
			}
			prefix += "\nMode:     " + pe.mode()
			t.Errorf("%s\nEncoder:  %s\nExpected: %q\nGot:      %q", prefix, enc, exp, got)
		}
	}
}

























type parserEncoder interface {
	encode(encoder.Encoder) (string, error)
	mode() string
}

type peInlines struct {
	is ast.InlineSlice

//-----------------------------------------------------------------------------
// Copyright (c) 2021-2022 Detlef Stern
//
// This file is part of Zettelstore.
//
// Zettelstore 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 encoder

import (
	"zettelstore.de/z/ast"
	"zettelstore.de/z/strfun"
)

// Environment specifies all data and functions that affects encoding.
type Environment struct {
	// Important for HTML encoder
	Lang           string // default language
	Interactive    bool   // Encoded data will be placed in interactive content
	Xhtml          bool   // use XHTML syntax instead of HTML syntax
	MarkerExternal string // Marker after link to (external) material.
	NewWindow      bool   // open link in new window
	IgnoreMeta     strfun.Set
	footnotes      []footnoteInfo // Stores footnotes detected while encoding
	footnoteNum    int
}

// IsInteractive returns true, if Interactive is enabled and currently embedded
// interactive encoding will take place.
func (env *Environment) IsInteractive(inInteractive bool) bool {
	return inInteractive && env != nil && env.Interactive
}

// IsXHTML return true, if XHTML is enabled.
func (env *Environment) IsXHTML() bool {
	return env != nil && env.Xhtml
}

// HasNewWindow retruns true, if a new browser windows should be opened.
func (env *Environment) HasNewWindow() bool {
	return env != nil && env.NewWindow
}

type footnoteInfo struct {
	fn  *ast.FootnoteNode
	num int
}

// AddFootnote adds a footnote node to the environment and returns the number of that footnote.
func (env *Environment) AddFootnote(fn *ast.FootnoteNode) int {
	if env == nil {
		return 0
	}
	env.footnoteNum++
	env.footnotes = append(env.footnotes, footnoteInfo{fn: fn, num: env.footnoteNum})
	return env.footnoteNum
}

// PopFootnote returns the next footnote and removes it from the list.
func (env *Environment) PopFootnote() (*ast.FootnoteNode, int) {
	if env == nil {
		return nil, -1
	}
	if len(env.footnotes) == 0 {
		env.footnotes = nil
		env.footnoteNum = 0
		return nil, -1
	}
	fni := env.footnotes[0]
	env.footnotes = env.footnotes[1:]
	return fni.fn, fni.num
}

//-----------------------------------------------------------------------------
// Copyright (c) 2020-2022 Detlef Stern
//
// This file is part of Zettelstore.
//
// Zettelstore 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 htmlenc encodes the abstract syntax tree into HTML5.
package htmlenc

import (
	"fmt"
	"strconv"
	"strings"

	"zettelstore.de/c/api"
	"zettelstore.de/c/html"
	"zettelstore.de/c/zjson"
	"zettelstore.de/z/ast"
	"zettelstore.de/z/strfun"
)

func (v *visitor) visitVerbatim(vn *ast.VerbatimNode) {
	switch vn.Kind {
	case ast.VerbatimZettel:
		v.b.WriteString("<!--\n")
		v.visitAttributes(vn.Attrs)
		v.writeHTMLEscaped(string(vn.Content))
		v.b.WriteString("\n-->")
	case ast.VerbatimProg:
		oldVisible := v.visibleSpace
		if vn.Attrs != nil {
			v.visibleSpace = vn.Attrs.HasDefault()
		}
		v.b.WriteString("<pre><code")
		v.visitAttributes(vn.Attrs)
		v.b.WriteByte('>')
		v.writeHTMLEscaped(string(vn.Content))
		v.b.WriteString("</code></pre>")
		v.visibleSpace = oldVisible

	case ast.VerbatimComment:
		if vn.Attrs.HasDefault() {
			v.b.WriteString("<!--\n")
			v.writeHTMLEscaped(string(vn.Content))
			v.b.WriteString("\n-->")
		}

	case ast.VerbatimHTML:
		if html.IsSave(string(vn.Content)) {
			v.b.Write(vn.Content)
		}
	default:
		panic(fmt.Sprintf("Unknown verbatim kind %v", vn.Kind))
	}
}

var specialSpanAttr = strfun.NewSet("example", "note", "tip", "important", "caution", "warning")

func processSpanAttributes(attrs zjson.Attributes) zjson.Attributes {
	if attrVal, ok := attrs.Get(""); ok {
		attrVal = strings.ToLower(attrVal)
		if specialSpanAttr.Has(attrVal) {
			attrs = attrs.Clone().Remove("").AddClass("zs-indication").AddClass("zs-" + attrVal)
		}
	}
	return attrs
}

func (v *visitor) visitRegion(rn *ast.RegionNode) {
	var code string
	attrs := rn.Attrs
	oldVerse := v.inVerse
	switch rn.Kind {
	case ast.RegionSpan:
		code = "div"
		attrs = processSpanAttributes(attrs)
	case ast.RegionVerse:
		v.inVerse = true
		code = "div"
	case ast.RegionQuote:
		code = "blockquote"
	default:
		panic(fmt.Sprintf("Unknown region kind %v", rn.Kind))
	}

	v.b.WriteStrings("<", code)
	v.visitAttributes(attrs)
	v.b.WriteString(">\n")
	ast.Walk(v, &rn.Blocks)
	if len(rn.Inlines) > 0 {
		v.b.WriteString("\n<cite>")
		ast.Walk(v, &rn.Inlines)
		v.b.WriteString("</cite>")
	}
	v.b.WriteStrings("\n</", code, ">")
	v.inVerse = oldVerse
}

func (v *visitor) visitHeading(hn *ast.HeadingNode) {
	lvl := hn.Level + 1
	if lvl > 6 {
		lvl = 6 // HTML has H1..H6
	}
	strLvl := strconv.Itoa(lvl)
	v.b.WriteStrings("<h", strLvl)
	v.visitAttributes(hn.Attrs)
	if _, ok := hn.Attrs.Get("id"); !ok {
		if fragment := hn.Fragment; fragment != "" {
			v.b.WriteStrings(" id=\"", fragment, "\"")
		}
	}
	v.b.WriteByte('>')
	ast.Walk(v, &hn.Inlines)
	v.b.WriteStrings("</h", strLvl, ">")
}

var mapNestedListKind = map[ast.NestedListKind]string{
	ast.NestedListOrdered:   "ol",
	ast.NestedListUnordered: "ul",
}

func (v *visitor) visitNestedList(ln *ast.NestedListNode) {
	if ln.Kind == ast.NestedListQuote {
		// NestedListQuote -> HTML <blockquote> doesn't use <li>...</li>
		v.writeQuotationList(ln)
		return
	}

	code, ok := mapNestedListKind[ln.Kind]
	if !ok {
		panic(fmt.Sprintf("Invalid list kind %v", ln.Kind))
	}

	compact := isCompactList(ln.Items)
	v.b.WriteStrings("<", code)
	v.visitAttributes(ln.Attrs)
	v.b.WriteString(">\n")
	for _, item := range ln.Items {
		v.b.WriteString("<li>")
		v.writeItemSliceOrPara(item, compact)
		v.b.WriteString("</li>\n")
	}
	v.b.WriteStrings("</", code, ">")
}

func (v *visitor) writeQuotationList(ln *ast.NestedListNode) {
	v.b.WriteString("<blockquote>\n")
	inPara := false
	for _, item := range ln.Items {
		if pn := getParaItem(item); pn != nil {
			if inPara {
				v.b.WriteByte('\n')
			} else {
				v.b.WriteString("<p>")
				inPara = true
			}
			ast.Walk(v, &pn.Inlines)
		} else {
			if inPara {
				v.writeEndPara()
				inPara = false
			}
			ast.WalkItemSlice(v, item)
		}
	}
	if inPara {
		v.writeEndPara()
	}
	v.b.WriteString("</blockquote>\n")
}

func getParaItem(its ast.ItemSlice) *ast.ParaNode {
	if len(its) != 1 {
		return nil
	}
	if pn, ok := its[0].(*ast.ParaNode); ok {
		return pn
	}
	return nil
}

func isCompactList(insl []ast.ItemSlice) bool {
	for _, ins := range insl {
		if !isCompactSlice(ins) {
			return false
		}
	}
	return true
}

func isCompactSlice(ins ast.ItemSlice) bool {
	if len(ins) < 1 {
		return true
	}
	if len(ins) == 1 {
		switch ins[0].(type) {
		case *ast.ParaNode, *ast.VerbatimNode, *ast.HRuleNode:
			return true
		case *ast.NestedListNode:
			return false
		}
	}
	return false
}

// writeItemSliceOrPara emits the content of a paragraph if the paragraph is
// the only element of the block slice and if compact mode is true. Otherwise,
// the item slice is emitted normally.
func (v *visitor) writeItemSliceOrPara(ins ast.ItemSlice, compact bool) {
	if compact && len(ins) == 1 {
		if para, ok := ins[0].(*ast.ParaNode); ok {
			ast.Walk(v, &para.Inlines)
			return
		}
	}
	for i, in := range ins {
		if i >= 0 {
			v.b.WriteByte('\n')
		}
		ast.Walk(v, in)
	}
	v.b.WriteByte('\n')
}

func (v *visitor) writeDescriptionsSlice(ds ast.DescriptionSlice) {
	if len(ds) == 1 {
		if para, ok := ds[0].(*ast.ParaNode); ok {
			ast.Walk(v, &para.Inlines)
			return
		}
	}
	ast.WalkDescriptionSlice(v, ds)
}

func (v *visitor) visitDescriptionList(dn *ast.DescriptionListNode) {
	v.b.WriteString("<dl>\n")
	for _, descr := range dn.Descriptions {
		v.b.WriteString("<dt>")
		ast.Walk(v, &descr.Term)
		v.b.WriteString("</dt>\n")

		for _, b := range descr.Descriptions {
			v.b.WriteString("<dd>")
			v.writeDescriptionsSlice(b)
			v.b.WriteString("</dd>\n")
		}
	}
	v.b.WriteString("</dl>")
}

func (v *visitor) visitTable(tn *ast.TableNode) {
	v.b.WriteString("<table>\n")
	if len(tn.Header) > 0 {
		v.b.WriteString("<thead>\n")
		v.writeRow(tn.Header, "<th", "</th>")
		v.b.WriteString("</thead>\n")
	}
	if len(tn.Rows) > 0 {
		v.b.WriteString("<tbody>\n")
		for _, row := range tn.Rows {
			v.writeRow(row, "<td", "</td>")
		}
		v.b.WriteString("</tbody>\n")
	}
	v.b.WriteString("</table>")
}

var alignStyle = map[ast.Alignment]string{
	ast.AlignDefault: ">",
	ast.AlignLeft:    " class=\"left\">",
	ast.AlignCenter:  " class=\"center\">",
	ast.AlignRight:   " class=\"right\">",
}

func (v *visitor) writeRow(row ast.TableRow, cellStart, cellEnd string) {
	v.b.WriteString("<tr>")
	for _, cell := range row {
		v.b.WriteString(cellStart)
		if len(cell.Inlines) == 0 {
			v.b.WriteByte('>')
		} else {
			v.b.WriteString(alignStyle[cell.Align])
			ast.Walk(v, &cell.Inlines)
		}
		v.b.WriteString(cellEnd)
	}
	v.b.WriteString("</tr>\n")
}

func (v *visitor) visitBLOB(bn *ast.BLOBNode) {
	switch bn.Syntax {
	case api.ValueSyntaxSVG:
		v.b.Write(bn.Blob)
	case api.ValueSyntaxGif, "jpeg", "png":
		v.b.WriteStrings("<img src=\"data:image/", bn.Syntax, ";base64,")
		v.b.WriteBase64(bn.Blob)
		v.b.WriteString("\" title=\"")
		v.writeQuotedEscaped(bn.Title)
		v.b.WriteString("\">")
	default:
		v.b.WriteStrings("<p class=\"zs-error\">Unable to display BLOB with syntax '", bn.Syntax, "'.</p>")
	}
}

func (v *visitor) writeEndPara() {
	v.b.WriteString("</p>")
}

//-----------------------------------------------------------------------------
// Copyright (c) 2020-2022 Detlef Stern
//
// This file is part of Zettelstore.
//
// Zettelstore 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 htmlenc encodes the abstract syntax tree into HTML5.
package htmlenc

import (
	"io"



	"zettelstore.de/c/api"

	"zettelstore.de/z/ast"
	"zettelstore.de/z/domain/meta"
	"zettelstore.de/z/encoder"


)

func init() {
	encoder.Register(api.EncoderHTML, encoder.Info{
		Create: func(env *encoder.Environment) encoder.Encoder { return &htmlEncoder{env: env} },
	})
}

type htmlEncoder struct {


	env *encoder.Environment


}

// WriteZettel encodes a full zettel as HTML5.
func (he *htmlEncoder) WriteZettel(w io.Writer, zn *ast.ZettelNode, evalMeta encoder.EvalMetaFunc) (int, error) {
	v := newVisitor(he, w)
	if !he.env.IsXHTML() {
		v.b.WriteString("<!DOCTYPE html>\n")
	}
	if env := he.env; env != nil && env.Lang == "" {
		v.b.WriteStrings("<html>\n<head>")
	} else {
		v.b.WriteStrings("<html lang=\"", env.Lang, "\">")
	}
	v.b.WriteString("\n<head>\n<meta charset=\"utf-8\">\n")
	plainTitle, hasTitle := zn.InhMeta.Get(api.KeyTitle)
	if hasTitle {
		v.b.WriteStrings("<title>", v.evalValue(plainTitle, evalMeta), "</title>")



	}

	v.acceptMeta(zn.InhMeta, evalMeta)
	v.b.WriteString("\n</head>\n<body>\n")

	if hasTitle {
		if isTitle := evalMeta(plainTitle); len(isTitle) > 0 {
			v.b.WriteString("<h1>")
			ast.Walk(v, &isTitle)


			v.b.WriteString("</h1>\n")
		}
	}

	ast.Walk(v, &zn.Ast)

	v.writeEndnotes()
	v.b.WriteString("</body>\n</html>")

	length, err := v.b.Flush()
	return length, err
}

// WriteMeta encodes meta data as HTML5.
func (he *htmlEncoder) WriteMeta(w io.Writer, m *meta.Meta, evalMeta encoder.EvalMetaFunc) (int, error) {
	v := newVisitor(he, w)

	// Write title
	if title, ok := m.Get(api.KeyTitle); ok {
		v.b.WriteStrings("<meta name=\"zs-", api.KeyTitle, "\" content=\"")
		v.writeQuotedEscaped(v.evalValue(title, evalMeta))
		v.b.WriteString("\">")
	}

	// Write other metadata
	v.acceptMeta(m, evalMeta)
	length, err := v.b.Flush()
	return length, err
}

func (he *htmlEncoder) WriteContent(w io.Writer, zn *ast.ZettelNode) (int, error) {
	return he.WriteBlocks(w, &zn.Ast)
}

// WriteBlocks encodes a block slice.
func (he *htmlEncoder) WriteBlocks(w io.Writer, bs *ast.BlockSlice) (int, error) {
	v := newVisitor(he, w)
	ast.Walk(v, bs)

	v.writeEndnotes()
	length, err := v.b.Flush()

	return length, err
}

// WriteInlines writes an inline slice to the writer
func (he *htmlEncoder) WriteInlines(w io.Writer, is *ast.InlineSlice) (int, error) {
	v := newVisitor(he, w)
	if env := he.env; env != nil {

		v.inInteractive = env.Interactive










	}

	ast.Walk(v, is)

	length, err := v.b.Flush()

	return length, err
}

//-----------------------------------------------------------------------------
// Copyright (c) 2020-2022 Detlef Stern
//
// This file is part of Zettelstore.
//
// Zettelstore 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 htmlenc encodes the abstract syntax tree into HTML5.
package htmlenc

import (
	"fmt"
	"strconv"

	"zettelstore.de/c/api"
	"zettelstore.de/c/html"
	"zettelstore.de/c/zjson"
	"zettelstore.de/z/ast"
)

func (v *visitor) visitBreak(bn *ast.BreakNode) {
	if bn.Hard {
		if v.env.IsXHTML() {
			v.b.WriteString("<br />\n")
		} else {
			v.b.WriteString("<br>\n")
		}
	} else {
		v.b.WriteByte('\n')
	}
}

func (v *visitor) visitLink(ln *ast.LinkNode) {
	switch ln.Ref.State {
	case ast.RefStateSelf, ast.RefStateFound, ast.RefStateHosted, ast.RefStateBased:
		v.writeAHref(ln.Ref, ln.Attrs, &ln.Inlines)
	case ast.RefStateBroken:
		attrs := ln.Attrs.Clone()
		attrs = attrs.Set("class", "broken")
		attrs = attrs.Set("title", "Zettel not found") // l10n
		v.writeAHref(ln.Ref, attrs, &ln.Inlines)
	case ast.RefStateExternal:
		attrs := ln.Attrs.Clone()
		attrs = attrs.Set("class", "external")
		if v.env.HasNewWindow() {
			attrs = attrs.Set("target", "_blank").Set("rel", "noopener noreferrer")
		}
		v.writeAHref(ln.Ref, attrs, &ln.Inlines)
		if v.env != nil {
			v.b.WriteString(v.env.MarkerExternal)
		}
	default:
		if v.env.IsInteractive(v.inInteractive) {
			v.writeSpan(&ln.Inlines, ln.Attrs)
			return
		}
		v.b.WriteString("<a href=\"")
		v.writeQuotedEscaped(ln.Ref.Value)
		v.b.WriteByte('"')
		v.visitAttributes(ln.Attrs)
		v.b.WriteByte('>')
		v.writeLinkInlines(&ln.Inlines, ln.Ref)
		v.inInteractive = false
		v.b.WriteString("</a>")
	}
}

func (v *visitor) writeAHref(ref *ast.Reference, attrs zjson.Attributes, is *ast.InlineSlice) {
	if v.env.IsInteractive(v.inInteractive) {
		v.writeSpan(is, attrs)
		return
	}
	v.b.WriteString("<a href=\"")
	v.writeReference(ref)
	v.b.WriteByte('"')
	v.visitAttributes(attrs)
	v.b.WriteByte('>')
	v.writeLinkInlines(is, ref)
	v.b.WriteString("</a>")
}
func (v *visitor) writeLinkInlines(is *ast.InlineSlice, ref *ast.Reference) {
	saveInteractive := v.inInteractive
	v.inInteractive = true
	if len(*is) == 0 {
		v.writeHTMLEscaped(ref.Value)
	} else {
		ast.Walk(v, is)
	}
	v.inInteractive = saveInteractive
}

func (v *visitor) visitEmbedRef(en *ast.EmbedRefNode) {
	v.b.WriteString("<img src=\"")
	v.writeReference(en.Ref)
	v.b.WriteString("\" alt=\"")
	ast.Walk(v, &en.Inlines) // TODO: wrong, must use textenc
	v.b.WriteByte('"')
	v.visitAttributes(en.Attrs)
	if v.env.IsXHTML() {
		v.b.WriteString(" />")
	} else {
		v.b.WriteByte('>')
	}
}

func (v *visitor) visitEmbedBLOB(en *ast.EmbedBLOBNode) {
	if en.Syntax == api.ValueSyntaxSVG {
		v.b.Write(en.Blob)
		return
	}

	v.b.WriteString("<img src=\"data:image/")
	v.b.WriteStrings(en.Syntax, ";base64,")
	v.b.WriteBase64(en.Blob)
	v.b.WriteString("\" alt=\"")
	ast.Walk(v, &en.Inlines)
	v.b.WriteByte('"')
	v.visitAttributes(en.Attrs)
	if v.env.IsXHTML() {
		v.b.WriteString(" />")
	} else {
		v.b.WriteByte('>')
	}
}

func (v *visitor) visitCite(cn *ast.CiteNode) {
	v.b.WriteString(cn.Key)
	if len(cn.Inlines) > 0 {
		v.b.WriteString(", ")
		ast.Walk(v, &cn.Inlines)
	}
}

func (v *visitor) visitFootnote(fn *ast.FootnoteNode) {
	if v.env.IsInteractive(v.inInteractive) {
		return
	}

	n := strconv.Itoa(v.env.AddFootnote(fn))
	v.b.WriteStrings("<sup id=\"fnref:", n, "\"><a href=\"#fn:", n, "\" class=\"footnote-ref\" role=\"doc-noteref\">", n, "</a></sup>")
	// TODO: what to do with Attrs?
}

func (v *visitor) visitMark(mn *ast.MarkNode) {
	if v.env.IsInteractive(v.inInteractive) {
		return
	}
	if fragment := mn.Fragment; fragment != "" {
		v.b.WriteStrings(`<a id="`, fragment, `">`)
		if len(mn.Inlines) > 0 {
			ast.Walk(v, &mn.Inlines)
		}
		v.b.WriteString("</a>")
	}
}

func (v *visitor) visitFormat(fn *ast.FormatNode) {
	var code string
	switch fn.Kind {
	case ast.FormatEmph:
		code = "em"
	case ast.FormatStrong:
		code = "strong"
	case ast.FormatInsert:
		code = "ins"
	case ast.FormatDelete:
		code = "del"
	case ast.FormatSuper:
		code = "sup"
	case ast.FormatSub:
		code = "sub"
	case ast.FormatQuote:
		code = "q"
	case ast.FormatSpan:
		v.writeSpan(&fn.Inlines, processSpanAttributes(fn.Attrs))
		return
	default:
		panic(fmt.Sprintf("Unknown format kind %v", fn.Kind))
	}
	v.b.WriteStrings("<", code)
	v.visitAttributes(fn.Attrs)
	v.b.WriteByte('>')
	ast.Walk(v, &fn.Inlines)
	v.b.WriteStrings("</", code, ">")
}

func (v *visitor) writeSpan(is *ast.InlineSlice, attrs zjson.Attributes) {
	v.b.WriteString("<span")
	v.visitAttributes(attrs)
	v.b.WriteByte('>')
	ast.Walk(v, is)
	v.b.WriteString("</span>")

}

func (v *visitor) visitLiteral(ln *ast.LiteralNode) {
	switch ln.Kind {
	case ast.LiteralProg:
		v.writeLiteral("<code", "</code>", ln.Attrs, ln.Content)
	case ast.LiteralInput:
		v.writeLiteral("<kbd", "</kbd>", ln.Attrs, ln.Content)
	case ast.LiteralOutput:
		v.writeLiteral("<samp", "</samp>", ln.Attrs, ln.Content)
	case ast.LiteralZettel, ast.LiteralComment:
		if v.inlinePos > 0 {
			v.b.WriteByte(' ')
		}
		v.b.WriteString("<!-- ")
		v.writeHTMLEscaped(string(ln.Content)) // writeCommentEscaped
		v.b.WriteString(" -->")
	case ast.LiteralHTML:
		if html.IsSave(string(ln.Content)) {
			v.b.Write(ln.Content)
		}
	default:
		panic(fmt.Sprintf("Unknown literal kind %v", ln.Kind))
	}
}

func (v *visitor) writeLiteral(codeS, codeE string, attrs zjson.Attributes, content []byte) {
	oldVisible := v.visibleSpace
	if attrs != nil {
		v.visibleSpace = attrs.HasDefault()
	}
	v.b.WriteString(codeS)
	v.visitAttributes(attrs)
	v.b.WriteByte('>')
	v.writeHTMLEscaped(string(content))
	v.b.WriteString(codeE)
	v.visibleSpace = oldVisible
}

//-----------------------------------------------------------------------------
// Copyright (c) 2020-2022 Detlef Stern
//
// This file is part of Zettelstore.
//
// Zettelstore 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 htmlenc

import (
	"bytes"
	"io"
	"strconv"
	"strings"

	"zettelstore.de/c/api"
	"zettelstore.de/c/html"
	"zettelstore.de/c/zjson"
	"zettelstore.de/z/ast"
	"zettelstore.de/z/domain/meta"
	"zettelstore.de/z/encoder"
	"zettelstore.de/z/strfun"
)

// visitor writes the abstract syntax tree to an io.Writer.
type visitor struct {
	env           *encoder.Environment
	b             encoder.EncWriter
	visibleSpace  bool // Show space character in plain text
	inVerse       bool // In verse block
	inInteractive bool // Rendered interactive HTML code
	textEnc       encoder.Encoder
	inlinePos     int // Element position in inline list node
}

func newVisitor(he *htmlEncoder, w io.Writer) *visitor {
	return &visitor{
		env:     he.env,
		b:       encoder.NewEncWriter(w),
		textEnc: encoder.Create(api.EncoderText, nil),
	}
}

func (v *visitor) Visit(node ast.Node) ast.Visitor {
	switch n := node.(type) {
	case *ast.BlockSlice:
		for i, bn := range *n {
			if i > 0 {
				v.b.WriteByte('\n')
			}
			ast.Walk(v, bn)
		}
	case *ast.InlineSlice:
		for i, in := range *n {
			v.inlinePos = i
			ast.Walk(v, in)
		}
		v.inlinePos = 0
	case *ast.ParaNode:
		v.b.WriteString("<p>")
		ast.Walk(v, &n.Inlines)
		v.writeEndPara()
	case *ast.VerbatimNode:
		v.visitVerbatim(n)
	case *ast.RegionNode:
		v.visitRegion(n)
	case *ast.HeadingNode:
		v.visitHeading(n)
	case *ast.HRuleNode:
		v.b.WriteString("<hr")
		v.visitAttributes(n.Attrs)
		if v.env.IsXHTML() {
			v.b.WriteString(" />")
		} else {
			v.b.WriteBytes('>')
		}
	case *ast.NestedListNode:
		v.visitNestedList(n)
	case *ast.DescriptionListNode:
		v.visitDescriptionList(n)
	case *ast.TableNode:
		v.visitTable(n)
	case *ast.TranscludeNode:
		return nil // Nothing to write. Or: an iFrame?
	case *ast.BLOBNode:
		v.visitBLOB(n)
	case *ast.TextNode:
		v.writeHTMLEscaped(n.Text)
	case *ast.TagNode:
		v.b.WriteString("<span class=\"zettel-tag\">#")
		v.writeHTMLEscaped(n.Tag)
		v.b.WriteString("</span>")
	case *ast.SpaceNode:
		if v.inVerse || v.env.IsXHTML() {
			v.b.WriteString(n.Lexeme)
		} else {
			v.b.WriteByte(' ')
		}
	case *ast.BreakNode:
		v.visitBreak(n)
	case *ast.LinkNode:
		v.visitLink(n)
	case *ast.EmbedRefNode:
		v.visitEmbedRef(n)
	case *ast.EmbedBLOBNode:
		v.visitEmbedBLOB(n)
	case *ast.CiteNode:
		v.visitCite(n)
	case *ast.FootnoteNode:
		v.visitFootnote(n)
	case *ast.MarkNode:
		v.visitMark(n)
	case *ast.FormatNode:
		v.visitFormat(n)
	case *ast.LiteralNode:
		v.visitLiteral(n)
	default:
		return v
	}
	return nil
}

var mapMetaKey = map[string]string{
	api.KeyCopyright: "copyright",
	api.KeyLicense:   "license",
}

func (v *visitor) acceptMeta(m *meta.Meta, evalMeta encoder.EvalMetaFunc) {
	ignore := v.setupIgnoreSet()
	ignore.Set(api.KeyTitle)
	if tags, ok := m.Get(api.KeyAllTags); ok {
		v.writeTags(tags)
		ignore.Set(api.KeyAllTags)
		ignore.Set(api.KeyTags)
	} else if tags, ok = m.Get(api.KeyTags); ok {
		v.writeTags(tags)
		ignore.Set(api.KeyTags)
	}

	for _, p := range m.ComputedPairs() {
		key := p.Key
		if ignore.Has(key) {
			continue
		}
		value := p.Value
		if m.Type(key) == meta.TypeZettelmarkup {
			if v := v.evalValue(value, evalMeta); v != "" {
				value = v
			}
		}
		if mKey, ok := mapMetaKey[key]; ok {
			v.writeMeta("", mKey, value)
		} else {
			v.writeMeta("zs-", key, value)
		}
	}
}

func (v *visitor) evalValue(value string, evalMeta encoder.EvalMetaFunc) string {
	var buf bytes.Buffer
	is := evalMeta(value)
	_, err := v.textEnc.WriteInlines(&buf, &is)
	if err == nil {
		return buf.String()
	}
	return ""
}

func (v *visitor) setupIgnoreSet() strfun.Set {
	if v.env == nil || v.env.IgnoreMeta == nil {
		return make(strfun.Set)
	}
	result := make(strfun.Set, len(v.env.IgnoreMeta))
	for k := range v.env.IgnoreMeta {
		result.Set(k)
	}
	return result
}

func (v *visitor) writeTags(tags string) {
	v.b.WriteString("\n<meta name=\"keywords\" content=\"")
	for i, val := range meta.ListFromValue(tags) {
		if i > 0 {
			v.b.WriteString(", ")
		}
		v.writeQuotedEscaped(strings.TrimPrefix(val, "#"))
	}
	v.b.WriteString("\">")
}

func (v *visitor) writeMeta(prefix, key, value string) {
	v.b.WriteStrings("\n<meta name=\"", prefix, key, "\" content=\"")
	v.writeQuotedEscaped(value)
	v.b.WriteString("\">")
}

func (v *visitor) writeEndnotes() {
	fn, fnNum := v.env.PopFootnote()
	if fn == nil {
		return
	}
	v.b.WriteString("\n<ol class=\"endnotes\">\n")
	for fn != nil {
		n := strconv.Itoa(fnNum)
		v.b.WriteStrings("<li value=\"", n, "\" id=\"fn:", n, "\" role=\"doc-endnote\">")
		ast.Walk(v, &fn.Inlines)
		v.b.WriteStrings(
			" <a href=\"#fnref:",
			n,
			"\" class=\"footnote-backref\" role=\"doc-backlink\">&#x21a9;&#xfe0e;</a></li>\n")
		fn, fnNum = v.env.PopFootnote()
	}
	v.b.WriteString("</ol>\n")
}

// visitAttributes write HTML attributes
func (v *visitor) visitAttributes(a zjson.Attributes) {
	if a.IsEmpty() {
		return
	}
	a = a.Clone().RemoveDefault()

	for _, k := range a.Keys() {
		if k == "" || k == "-" {
			continue
		}
		v.b.WriteStrings(" ", k)
		vl := a[k]
		if len(vl) > 0 {
			v.b.WriteString("=\"")
			v.writeQuotedEscaped(vl)
			v.b.WriteByte('"')
		}
	}
}

func (v *visitor) writeHTMLEscaped(s string) {
	if v.visibleSpace {
		html.EscapeVisible(&v.b, s)
	} else {
		html.Escape(&v.b, s)
	}
}

func (v *visitor) writeQuotedEscaped(s string) {
	html.AttributeEscape(&v.b, s)
}

func (v *visitor) writeReference(ref *ast.Reference) {
	if ref.URL == nil {
		v.writeHTMLEscaped(ref.Value)
		return
	}
	v.b.WriteString(ref.URL.String())
}

//-----------------------------------------------------------------------------
// Copyright (c) 2020-2022 Detlef Stern
//
// This file is part of Zettelstore.
//
// Zettelstore 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 nativeenc encodes the abstract syntax tree into native format.
package nativeenc

import (
	"fmt"
	"io"
	"strconv"

	"zettelstore.de/c/api"
	"zettelstore.de/c/zjson"
	"zettelstore.de/z/ast"
	"zettelstore.de/z/domain/meta"
	"zettelstore.de/z/encoder"
)

func init() {
	encoder.Register(api.EncoderNative, encoder.Info{
		Create: func(env *encoder.Environment) encoder.Encoder { return &nativeEncoder{env: env} },
	})
}

type nativeEncoder struct {
	env *encoder.Environment
}

// WriteZettel encodes the zettel to the writer.
func (ne *nativeEncoder) WriteZettel(w io.Writer, zn *ast.ZettelNode, evalMeta encoder.EvalMetaFunc) (int, error) {
	v := newVisitor(w, ne)
	v.acceptMeta(zn.InhMeta, evalMeta)
	v.b.WriteByte('\n')
	ast.Walk(v, &zn.Ast)
	length, err := v.b.Flush()
	return length, err
}

// WriteMeta encodes meta data in native format.
func (ne *nativeEncoder) WriteMeta(w io.Writer, m *meta.Meta, evalMeta encoder.EvalMetaFunc) (int, error) {
	v := newVisitor(w, ne)
	v.acceptMeta(m, evalMeta)
	length, err := v.b.Flush()
	return length, err
}

func (ne *nativeEncoder) WriteContent(w io.Writer, zn *ast.ZettelNode) (int, error) {
	return ne.WriteBlocks(w, &zn.Ast)
}

// WriteBlocks writes a block slice to the writer
func (ne *nativeEncoder) WriteBlocks(w io.Writer, bs *ast.BlockSlice) (int, error) {
	v := newVisitor(w, ne)
	ast.Walk(v, bs)
	length, err := v.b.Flush()
	return length, err
}

// WriteInlines writes an inline slice to the writer
func (ne *nativeEncoder) WriteInlines(w io.Writer, is *ast.InlineSlice) (int, error) {
	v := newVisitor(w, ne)
	ast.Walk(v, is)
	length, err := v.b.Flush()
	return length, err
}

// visitor writes the abstract syntax tree to an io.Writer.
type visitor struct {
	b     encoder.EncWriter
	level int
	env   *encoder.Environment
}

func newVisitor(w io.Writer, enc *nativeEncoder) *visitor {
	return &visitor{b: encoder.NewEncWriter(w), env: enc.env}
}

func (v *visitor) Visit(node ast.Node) ast.Visitor {
	switch n := node.(type) {
	case *ast.BlockSlice:
		v.visitBlockSlice(n)
	case *ast.InlineSlice:
		v.walkInlineSlice(n)
	case *ast.ParaNode:
		v.b.WriteString("[Para ")
		ast.Walk(v, &n.Inlines)
		v.b.WriteByte(']')
	case *ast.VerbatimNode:
		v.visitVerbatim(n)
	case *ast.RegionNode:
		v.visitRegion(n)
	case *ast.HeadingNode:
		v.visitHeading(n)
	case *ast.HRuleNode:
		v.b.WriteString("[Hrule")
		v.visitAttributes(n.Attrs)
		v.b.WriteByte(']')
	case *ast.NestedListNode:
		v.visitNestedList(n)
	case *ast.DescriptionListNode:
		v.visitDescriptionList(n)
	case *ast.TableNode:
		v.visitTable(n)
	case *ast.TranscludeNode:
		v.b.WriteString("[Transclude ")
		v.b.WriteString(mapRefState[n.Ref.State])
		v.b.WriteString(" \"")
		v.writeEscaped(n.Ref.String())
		v.b.WriteString("\"]")
	case *ast.BLOBNode:
		v.visitBLOB(n)
	case *ast.TextNode:
		v.b.WriteString("Text \"")
		v.writeEscaped(n.Text)
		v.b.WriteByte('"')
	case *ast.TagNode:
		v.b.WriteString("Tag \"")
		v.writeEscaped(n.Tag)
		v.b.WriteByte('"')
	case *ast.SpaceNode:
		v.b.WriteString("Space")
		if l := n.Count(); l > 1 {
			v.b.WriteByte(' ')
			v.b.WriteString(strconv.Itoa(l))
		}
	case *ast.BreakNode:
		if n.Hard {
			v.b.WriteString("Break")
		} else {
			v.b.WriteString("Space")
		}
	case *ast.LinkNode:
		v.visitLink(n)
	case *ast.EmbedRefNode:
		v.visitEmbedRef(n)
	case *ast.EmbedBLOBNode:
		v.visitEmbedBLOB(n)
	case *ast.CiteNode:
		v.b.WriteString("Cite")
		v.visitAttributes(n.Attrs)
		v.b.WriteString(" \"")
		v.writeEscaped(n.Key)
		v.b.WriteByte('"')
		if len(n.Inlines) > 0 {
			v.b.WriteString(" [")
			ast.Walk(v, &n.Inlines)
			v.b.WriteByte(']')
		}
	case *ast.FootnoteNode:
		v.b.WriteString("Footnote")
		v.visitAttributes(n.Attrs)
		v.b.WriteString(" [")
		ast.Walk(v, &n.Inlines)
		v.b.WriteByte(']')
	case *ast.MarkNode:
		v.visitMark(n)
	case *ast.FormatNode:
		v.b.Write(mapFormatKind[n.Kind])
		v.visitAttributes(n.Attrs)
		v.b.WriteString(" [")
		ast.Walk(v, &n.Inlines)
		v.b.WriteByte(']')
	case *ast.LiteralNode:
		kind, ok := mapLiteralKind[n.Kind]
		if !ok {
			panic(fmt.Sprintf("Unknown literal kind %v", n.Kind))
		}
		v.b.Write(kind)
		v.visitAttributes(n.Attrs)
		v.b.WriteString(" \"")
		v.writeEscaped(string(n.Content))
		v.b.WriteByte('"')
	default:
		return v
	}
	return nil
}

var (
	rawBackslash   = []byte{'\\', '\\'}
	rawDoubleQuote = []byte{'\\', '"'}
	rawNewline     = []byte{'\\', 'n'}
)

func (v *visitor) acceptMeta(m *meta.Meta, evalMeta encoder.EvalMetaFunc) {
	v.writeZettelmarkup("Title", m.GetDefault(api.KeyTitle, ""), evalMeta)
	v.writeMetaString(m, api.KeyRole, "Role")
	v.writeMetaList(m, api.KeyTags, "Tags")
	v.writeMetaString(m, api.KeySyntax, "Syntax")
	pairs := m.ComputedPairsRest()
	if len(pairs) == 0 {
		return
	}
	v.b.WriteString("\n[Header")
	v.level++
	for i, p := range pairs {
		v.writeComma(i)
		v.writeNewLine()
		key, value := p.Key, p.Value
		if meta.Type(key) == meta.TypeZettelmarkup {
			v.writeZettelmarkup(key, value, evalMeta)
		} else {
			v.b.WriteByte('[')
			v.b.WriteStrings(key, " \"")
			v.writeEscaped(value)
			v.b.WriteString("\"]")
		}
	}
	v.level--
	v.b.WriteByte(']')
}

func (v *visitor) writeZettelmarkup(key, value string, evalMeta encoder.EvalMetaFunc) {
	v.b.WriteByte('[')
	v.b.WriteString(key)
	v.b.WriteByte(' ')
	is := evalMeta(value)
	ast.Walk(v, &is)
	v.b.WriteByte(']')
}

func (v *visitor) writeMetaString(m *meta.Meta, key, native string) {
	if val, ok := m.Get(key); ok && len(val) > 0 {
		v.b.WriteStrings("\n[", native, " \"", val, "\"]")
	}
}

func (v *visitor) writeMetaList(m *meta.Meta, key, native string) {
	if vals, ok := m.GetList(key); ok && len(vals) > 0 {
		v.b.WriteStrings("\n[", native)
		for _, val := range vals {
			v.b.WriteByte(' ')
			v.b.WriteString(val)
		}
		v.b.WriteByte(']')
	}
}

var mapVerbatimKind = map[ast.VerbatimKind][]byte{
	ast.VerbatimZettel:  []byte("[ZettelBlock"),
	ast.VerbatimProg:    []byte("[CodeBlock"),
	ast.VerbatimComment: []byte("[CommentBlock"),
	ast.VerbatimHTML:    []byte("[HTMLBlock"),
}

func (v *visitor) visitVerbatim(vn *ast.VerbatimNode) {
	kind, ok := mapVerbatimKind[vn.Kind]
	if !ok {
		panic(fmt.Sprintf("Unknown verbatim kind %v", vn.Kind))
	}
	v.b.Write(kind)
	v.visitAttributes(vn.Attrs)
	v.b.WriteString(" \"")
	v.writeEscaped(string(vn.Content))
	v.b.WriteString("\"]")
}

var mapRegionKind = map[ast.RegionKind][]byte{
	ast.RegionSpan:  []byte("[SpanBlock"),
	ast.RegionQuote: []byte("[QuoteBlock"),
	ast.RegionVerse: []byte("[VerseBlock"),
}

func (v *visitor) visitRegion(rn *ast.RegionNode) {
	kind, ok := mapRegionKind[rn.Kind]
	if !ok {
		panic(fmt.Sprintf("Unknown region kind %v", rn.Kind))
	}
	v.b.Write(kind)
	v.visitAttributes(rn.Attrs)
	v.level++
	v.writeNewLine()
	v.b.WriteByte('[')
	v.level++
	ast.Walk(v, &rn.Blocks)
	v.level--
	v.b.WriteByte(']')
	if len(rn.Inlines) > 0 {
		v.b.WriteByte(',')
		v.writeNewLine()
		v.b.WriteString("[Cite ")
		ast.Walk(v, &rn.Inlines)
		v.b.WriteByte(']')
	}
	v.level--
	v.b.WriteByte(']')
}

func (v *visitor) visitHeading(hn *ast.HeadingNode) {
	v.b.WriteStrings("[Heading ", strconv.Itoa(hn.Level))
	if fragment := hn.Fragment; fragment != "" {
		v.b.WriteStrings(" #", fragment)
	}
	v.visitAttributes(hn.Attrs)
	v.b.WriteByte(' ')
	ast.Walk(v, &hn.Inlines)
	v.b.WriteByte(']')
}

var mapNestedListKind = map[ast.NestedListKind][]byte{
	ast.NestedListOrdered:   []byte("[OrderedList"),
	ast.NestedListUnordered: []byte("[BulletList"),
	ast.NestedListQuote:     []byte("[QuoteList"),
}

func (v *visitor) visitNestedList(ln *ast.NestedListNode) {
	v.b.Write(mapNestedListKind[ln.Kind])
	v.level++
	for i, item := range ln.Items {
		v.writeComma(i)
		v.writeNewLine()
		v.level++
		v.b.WriteByte('[')
		for i, in := range item {
			if i > 0 {
				v.b.WriteByte(',')
				v.writeNewLine()
			}
			ast.Walk(v, in)
		}
		v.b.WriteByte(']')
		v.level--
	}
	v.level--
	v.b.WriteByte(']')
}

func (v *visitor) visitDescriptionList(dn *ast.DescriptionListNode) {
	v.b.WriteString("[DescriptionList")
	v.level++
	for i, descr := range dn.Descriptions {
		v.writeComma(i)
		v.writeNewLine()
		v.b.WriteString("[Term [")
		ast.Walk(v, &descr.Term)
		v.b.WriteByte(']')

		if len(descr.Descriptions) > 0 {
			v.level++
			for _, b := range descr.Descriptions {
				v.b.WriteByte(',')
				v.writeNewLine()
				v.b.WriteString("[Description")
				v.level++
				v.writeNewLine()
				for i, dn := range b {
					if i > 0 {
						v.b.WriteByte(',')
						v.writeNewLine()
					}
					ast.Walk(v, dn)
				}
				v.b.WriteByte(']')
				v.level--
			}
			v.level--
		}
		v.b.WriteByte(']')
	}
	v.level--
	v.b.WriteByte(']')
}

func (v *visitor) visitTable(tn *ast.TableNode) {
	v.b.WriteString("[Table")
	v.level++
	if len(tn.Header) > 0 {
		v.writeNewLine()
		v.b.WriteString("[Header ")
		for i, cell := range tn.Header {
			v.writeComma(i)
			v.writeCell(cell)
		}
		v.b.WriteString("],")
	}
	for i, row := range tn.Rows {
		v.writeComma(i)
		v.writeNewLine()
		v.b.WriteString("[Row ")
		for j, cell := range row {
			v.writeComma(j)
			v.writeCell(cell)
		}
		v.b.WriteByte(']')
	}
	v.level--
	v.b.WriteByte(']')
}

var alignString = map[ast.Alignment]string{
	ast.AlignDefault: " Default",
	ast.AlignLeft:    " Left",
	ast.AlignCenter:  " Center",
	ast.AlignRight:   " Right",
}

func (v *visitor) writeCell(cell *ast.TableCell) {
	v.b.WriteStrings("[Cell", alignString[cell.Align])
	if len(cell.Inlines) > 0 {
		v.b.WriteByte(' ')
		ast.Walk(v, &cell.Inlines)
	}
	v.b.WriteByte(']')
}

func (v *visitor) visitBLOB(bn *ast.BLOBNode) {
	v.b.WriteString("[BLOB \"")
	v.writeEscaped(bn.Title)
	v.b.WriteString("\" \"")
	v.writeEscaped(bn.Syntax)
	v.b.WriteString("\" \"")
	if bn.Syntax == api.ValueSyntaxSVG {
		v.writeEscaped(string(bn.Blob))
	} else {
		v.b.WriteBase64(bn.Blob)
	}
	v.b.WriteString("\"]")
}

var mapRefState = map[ast.RefState]string{
	ast.RefStateInvalid:  "INVALID",
	ast.RefStateZettel:   "ZETTEL",
	ast.RefStateSelf:     "SELF",
	ast.RefStateFound:    "ZETTEL",
	ast.RefStateBroken:   "BROKEN",
	ast.RefStateHosted:   "LOCAL",
	ast.RefStateBased:    "BASED",
	ast.RefStateExternal: "EXTERNAL",
}

func (v *visitor) visitLink(ln *ast.LinkNode) {
	v.b.WriteString("Link")
	v.visitAttributes(ln.Attrs)
	v.b.WriteByte(' ')
	v.b.WriteString(mapRefState[ln.Ref.State])
	v.b.WriteString(" \"")
	v.writeEscaped(ln.Ref.String())
	v.b.WriteByte('"')
	if len(ln.Inlines) > 0 {
		v.b.WriteString(" [")
		ast.Walk(v, &ln.Inlines)
		v.b.WriteByte(']')
	}
}

func (v *visitor) visitEmbedRef(en *ast.EmbedRefNode) {
	v.b.WriteString("Embed")
	v.visitAttributes(en.Attrs)
	v.b.WriteByte(' ')
	v.b.WriteString(mapRefState[en.Ref.State])
	v.b.WriteString(" \"")
	v.writeEscaped(en.Ref.String())
	v.b.WriteByte('"')

	if len(en.Inlines) > 0 {
		v.b.WriteString(" [")
		ast.Walk(v, &en.Inlines)
		v.b.WriteByte(']')
	}
}

func (v *visitor) visitEmbedBLOB(en *ast.EmbedBLOBNode) {
	v.b.WriteString("EmbedBLOB")
	v.visitAttributes(en.Attrs)
	v.b.WriteStrings(" {\"", en.Syntax, "\" \"")
	if en.Syntax == api.ValueSyntaxSVG {
		v.writeEscaped(string(en.Blob))
	} else {
		v.b.WriteString("\" \"")
		v.b.WriteBase64(en.Blob)
	}
	v.b.WriteString("\"}")

	if len(en.Inlines) > 0 {
		v.b.WriteString(" [")
		ast.Walk(v, &en.Inlines)
		v.b.WriteByte(']')
	}
}

func (v *visitor) visitMark(mn *ast.MarkNode) {
	v.b.WriteString("Mark")
	if text := mn.Mark; text != "" {
		v.b.WriteString(" \"")
		v.writeEscaped(text)
		v.b.WriteByte('"')
	}
	if fragment := mn.Fragment; fragment != "" {
		v.b.WriteString(" #")
		v.writeEscaped(fragment)
	}
	if len(mn.Inlines) > 0 {
		v.b.WriteString(" [")
		ast.Walk(v, &mn.Inlines)
		v.b.WriteByte(']')
	}
}

var mapFormatKind = map[ast.FormatKind][]byte{
	ast.FormatEmph:   []byte("Emph"),
	ast.FormatStrong: []byte("Strong"),
	ast.FormatInsert: []byte("Insert"),
	ast.FormatDelete: []byte("Delete"),
	ast.FormatSuper:  []byte("Super"),
	ast.FormatSub:    []byte("Sub"),
	ast.FormatQuote:  []byte("Quote"),
	ast.FormatSpan:   []byte("Span"),
}

var mapLiteralKind = map[ast.LiteralKind][]byte{
	ast.LiteralZettel:  []byte("Zettel"),
	ast.LiteralProg:    []byte("Code"),
	ast.LiteralInput:   []byte("Input"),
	ast.LiteralOutput:  []byte("Output"),
	ast.LiteralComment: []byte("Comment"),
	ast.LiteralHTML:    []byte("HTML"),
}

func (v *visitor) visitBlockSlice(bs *ast.BlockSlice) {
	for i, bn := range *bs {
		if i > 0 {
			v.b.WriteByte(',')
			v.writeNewLine()
		}
		ast.Walk(v, bn)
	}
}
func (v *visitor) walkInlineSlice(is *ast.InlineSlice) {
	for i, in := range *is {
		v.writeComma(i)
		ast.Walk(v, in)
	}
}

// visitAttributes write native attributes
func (v *visitor) visitAttributes(a zjson.Attributes) {
	if a.IsEmpty() {
		return
	}

	v.b.WriteString(" (\"")
	if val, ok := a[""]; ok {
		v.writeEscaped(val)
	}
	v.b.WriteString("\",[")
	for i, k := range a.Keys() {
		if k == "" {
			continue
		}
		v.writeComma(i)
		v.b.WriteString(k)
		val := a[k]
		if len(val) > 0 {
			v.b.WriteString("=\"")
			v.writeEscaped(val)
			v.b.WriteByte('"')
		}
	}
	v.b.WriteString("])")
}

func (v *visitor) writeNewLine() {
	v.b.WriteByte('\n')
	for i := 0; i < v.level; i++ {
		v.b.WriteByte(' ')
	}
}

func (v *visitor) writeEscaped(s string) {
	last := 0
	for i, ch := range s {
		var b []byte
		switch ch {
		case '\n':
			b = rawNewline
		case '"':
			b = rawDoubleQuote
		case '\\':
			b = rawBackslash
		default:
			continue
		}
		v.b.WriteString(s[last:i])
		v.b.Write(b)
		last = i + 1
	}
	v.b.WriteString(s[last:])
}

func (v *visitor) writeComma(pos int) {
	if pos > 0 {
		v.b.WriteByte(',')
	}
}

	"zettelstore.de/c/api"
	"zettelstore.de/z/ast"
	"zettelstore.de/z/domain/meta"
	"zettelstore.de/z/encoder"
)

func init() {
	encoder.Register(api.EncoderText, encoder.Info{
		Create: func(*encoder.Environment) encoder.Encoder { return &textEncoder{} },
	})
}



type textEncoder struct{}



// WriteZettel writes metadata and content.
func (te *textEncoder) WriteZettel(w io.Writer, zn *ast.ZettelNode, evalMeta encoder.EvalMetaFunc) (int, error) {
	v := newVisitor(w)
	te.WriteMeta(&v.b, zn.InhMeta, evalMeta)
	v.visitBlockSlice(&zn.Ast)
	length, err := v.b.Flush()
	return length, err
}

// WriteMeta encodes metadata as text.
func (te *textEncoder) WriteMeta(w io.Writer, m *meta.Meta, evalMeta encoder.EvalMetaFunc) (int, error) {
	buf := encoder.NewEncWriter(w)
	for _, pair := range m.ComputedPairs() {
		switch meta.Type(pair.Key) {
		case meta.TypeTagSet:
			writeTagSet(&buf, meta.ListFromValue(pair.Value))
		case meta.TypeZettelmarkup:
			is := evalMeta(pair.Value)

			buf.WriteByte(' ')
		}
		buf.WriteString(meta.CleanTag(tag))
	}

}

func (te *textEncoder) WriteContent(w io.Writer, zn *ast.ZettelNode) (int, error) {
	return te.WriteBlocks(w, &zn.Ast)
}

// WriteBlocks writes the content of a block slice to the writer.
func (*textEncoder) WriteBlocks(w io.Writer, bs *ast.BlockSlice) (int, error) {
	v := newVisitor(w)
	v.visitBlockSlice(bs)
	length, err := v.b.Flush()
	return length, err
}

// WriteInlines writes an inline slice to the writer
func (*textEncoder) WriteInlines(w io.Writer, is *ast.InlineSlice) (int, error) {
	v := newVisitor(w)
	ast.Walk(v, is)
	length, err := v.b.Flush()
	return length, err
}

// visitor writes the abstract syntax tree to an io.Writer.
type visitor struct {
	b         encoder.EncWriter
	inlinePos int
}

func newVisitor(w io.Writer) *visitor {
	return &visitor{b: encoder.NewEncWriter(w)}
}

func (v *visitor) Visit(node ast.Node) ast.Visitor {
	switch n := node.(type) {
	case *ast.BlockSlice:
		v.visitBlockSlice(n)

	case *ast.InlineSlice:
		for i, in := range *n {
			v.inlinePos = i
			ast.Walk(v, in)
		}
		v.inlinePos = 0
		return nil
	case *ast.VerbatimNode:
		v.visitVerbatim(n)
		return nil
	case *ast.RegionNode:
		v.visitBlockSlice(&n.Blocks)
		if len(n.Inlines) > 0 {

func (v *visitor) visitBlockSlice(bs *ast.BlockSlice) {
	for i, bn := range *bs {
		v.writePosChar(i, '\n')
		ast.Walk(v, bn)
	}
}









func (v *visitor) writePosChar(pos int, ch byte) {
	if pos > 0 {
		v.b.WriteByte(ch)
	}
}

import (
	"fmt"
	"io"
	"strconv"

	"zettelstore.de/c/api"

	"zettelstore.de/c/zjson"
	"zettelstore.de/z/ast"
	"zettelstore.de/z/domain/meta"
	"zettelstore.de/z/encoder"
	"zettelstore.de/z/strfun"
)

func init() {
	encoder.Register(api.EncoderZJSON, encoder.Info{
		Create: func(env *encoder.Environment) encoder.Encoder { return &jsonDetailEncoder{env: env} },
	})
}



type jsonDetailEncoder struct {
	env *encoder.Environment
}


// WriteZettel writes the encoded zettel to the writer.
func (je *jsonDetailEncoder) WriteZettel(w io.Writer, zn *ast.ZettelNode, evalMeta encoder.EvalMetaFunc) (int, error) {
	v := newDetailVisitor(w, je)
	v.b.WriteString(`{"meta":`)
	v.writeMeta(zn.InhMeta, evalMeta)
	v.b.WriteString(`,"content":`)
	ast.Walk(v, &zn.Ast)
	v.b.WriteByte('}')
	length, err := v.b.Flush()
	return length, err
}

// WriteMeta encodes meta data as JSON.
func (je *jsonDetailEncoder) WriteMeta(w io.Writer, m *meta.Meta, evalMeta encoder.EvalMetaFunc) (int, error) {
	v := newDetailVisitor(w, je)
	v.writeMeta(m, evalMeta)
	length, err := v.b.Flush()
	return length, err
}

func (je *jsonDetailEncoder) WriteContent(w io.Writer, zn *ast.ZettelNode) (int, error) {
	return je.WriteBlocks(w, &zn.Ast)
}

// WriteBlocks writes a block slice to the writer
func (je *jsonDetailEncoder) WriteBlocks(w io.Writer, bs *ast.BlockSlice) (int, error) {
	v := newDetailVisitor(w, je)
	ast.Walk(v, bs)
	length, err := v.b.Flush()
	return length, err
}

// WriteInlines writes an inline slice to the writer
func (je *jsonDetailEncoder) WriteInlines(w io.Writer, is *ast.InlineSlice) (int, error) {
	v := newDetailVisitor(w, je)
	ast.Walk(v, is)
	length, err := v.b.Flush()
	return length, err
}

// visitor writes the abstract syntax tree to an io.Writer.
type visitor struct {
	b       encoder.EncWriter
	env     *encoder.Environment
	inVerse bool // Visiting a verse block: save spaces in ZJSON object
}

func newDetailVisitor(w io.Writer, je *jsonDetailEncoder) *visitor {
	return &visitor{b: encoder.NewEncWriter(w), env: je.env}
}

func (v *visitor) Visit(node ast.Node) ast.Visitor {
	switch n := node.(type) {
	case *ast.BlockSlice:
		v.visitBlockSlice(n)
		return nil
	case *ast.InlineSlice:

	v.b.WriteByte('}')
	return nil
}

var mapVerbatimKind = map[ast.VerbatimKind]string{
	ast.VerbatimZettel:  zjson.TypeVerbatimZettel,
	ast.VerbatimProg:    zjson.TypeVerbatimCode,


	ast.VerbatimComment: zjson.TypeVerbatimComment,
	ast.VerbatimHTML:    zjson.TypeVerbatimHTML,
}

func (v *visitor) visitVerbatim(vn *ast.VerbatimNode) {
	kind, ok := mapVerbatimKind[vn.Kind]
	if !ok {

var mapLiteralKind = map[ast.LiteralKind]string{
	ast.LiteralZettel:  zjson.TypeLiteralZettel,
	ast.LiteralProg:    zjson.TypeLiteralCode,
	ast.LiteralInput:   zjson.TypeLiteralInput,
	ast.LiteralOutput:  zjson.TypeLiteralOutput,
	ast.LiteralComment: zjson.TypeLiteralComment,
	ast.LiteralHTML:    zjson.TypeLiteralHTML,

}

func (v *visitor) visitBlockSlice(bs *ast.BlockSlice) {
	v.b.WriteByte('[')
	for i, bn := range *bs {
		v.writeComma(i)
		ast.Walk(v, bn)

		v.writeComma(i)
		ast.Walk(v, in)
	}
	v.b.WriteByte(']')
}

// visitAttributes write JSON attributes
func (v *visitor) visitAttributes(a zjson.Attributes) {
	if a.IsEmpty() {
		return
	}

	v.writeContentStart(zjson.NameAttribute)
	for i, k := range a.Keys() {
		if i > 0 {

package zmkenc

import (
	"fmt"
	"io"

	"zettelstore.de/c/api"
	"zettelstore.de/c/zjson"
	"zettelstore.de/z/ast"
	"zettelstore.de/z/domain/meta"
	"zettelstore.de/z/encoder"
	"zettelstore.de/z/strfun"
)

func init() {
	encoder.Register(api.EncoderZmk, encoder.Info{
		Create: func(*encoder.Environment) encoder.Encoder { return &zmkEncoder{} },
	})
}

type zmkEncoder struct{}



// WriteZettel writes the encoded zettel to the writer.
func (ze *zmkEncoder) WriteZettel(w io.Writer, zn *ast.ZettelNode, evalMeta encoder.EvalMetaFunc) (int, error) {
	v := newVisitor(w, ze)
	v.acceptMeta(zn.InhMeta, evalMeta)
	if zn.InhMeta.YamlSep {
		v.b.WriteString("---\n")
	} else {
		v.b.WriteByte('\n')
	}
	ast.Walk(v, &zn.Ast)
	length, err := v.b.Flush()
	return length, err
}

// WriteMeta encodes meta data as zmk.
func (ze *zmkEncoder) WriteMeta(w io.Writer, m *meta.Meta, evalMeta encoder.EvalMetaFunc) (int, error) {
	v := newVisitor(w, ze)
	v.acceptMeta(m, evalMeta)
	length, err := v.b.Flush()
	return length, err
}

func (v *visitor) acceptMeta(m *meta.Meta, evalMeta encoder.EvalMetaFunc) {
	for _, p := range m.ComputedPairs() {

}

func (ze *zmkEncoder) WriteContent(w io.Writer, zn *ast.ZettelNode) (int, error) {
	return ze.WriteBlocks(w, &zn.Ast)
}

// WriteBlocks writes the content of a block slice to the writer.
func (ze *zmkEncoder) WriteBlocks(w io.Writer, bs *ast.BlockSlice) (int, error) {
	v := newVisitor(w, ze)
	ast.Walk(v, bs)
	length, err := v.b.Flush()
	return length, err
}

// WriteInlines writes an inline slice to the writer
func (ze *zmkEncoder) WriteInlines(w io.Writer, is *ast.InlineSlice) (int, error) {
	v := newVisitor(w, ze)
	ast.Walk(v, is)
	length, err := v.b.Flush()
	return length, err
}

// visitor writes the abstract syntax tree to an io.Writer.
type visitor struct {
	b         encoder.EncWriter
	prefix    []byte
	enc       *zmkEncoder
	inVerse   bool
	inlinePos int
}

func newVisitor(w io.Writer, enc *zmkEncoder) *visitor {
	return &visitor{
		b:   encoder.NewEncWriter(w),
		enc: enc,
	}
}

func (v *visitor) Visit(node ast.Node) ast.Visitor {
	switch n := node.(type) {
	case *ast.BlockSlice:
		v.visitBlockSlice(n)
	case *ast.InlineSlice:

}

var mapVerbatimKind = map[ast.VerbatimKind]string{
	ast.VerbatimZettel:  "@@@",
	ast.VerbatimComment: "%%%",
	ast.VerbatimHTML:    "@@@", // Attribute is set to {="html"}
	ast.VerbatimProg:    "```",


}

func (v *visitor) visitVerbatim(vn *ast.VerbatimNode) {
	kind, ok := mapVerbatimKind[vn.Kind]
	if !ok {
		panic(fmt.Sprintf("Unknown verbatim kind %d", vn.Kind))
	}

func (v *visitor) visitLiteral(ln *ast.LiteralNode) {
	switch ln.Kind {
	case ast.LiteralZettel:
		v.writeLiteral('@', ln.Attrs, ln.Content)
	case ast.LiteralProg:
		v.writeLiteral('`', ln.Attrs, ln.Content)



	case ast.LiteralInput:
		v.writeLiteral('\'', ln.Attrs, ln.Content)
	case ast.LiteralOutput:
		v.writeLiteral('=', ln.Attrs, ln.Content)
	case ast.LiteralComment:
		if v.inlinePos > 0 {
			v.b.WriteByte(' ')
		}
		v.b.WriteString("%% ")


		v.b.Write(ln.Content)
	case ast.LiteralHTML:
		v.writeLiteral('x', syntaxToHTML(ln.Attrs), ln.Content)
	default:
		panic(fmt.Sprintf("Unknown literal kind %v", ln.Kind))
	}
}

func (v *visitor) writeLiteral(code byte, attrs zjson.Attributes, content []byte) {
	v.b.WriteBytes(code, code)
	v.writeEscaped(string(content), code)
	v.b.WriteBytes(code, code)
	v.visitAttributes(attrs)
}

// visitAttributes write HTML attributes
func (v *visitor) visitAttributes(a zjson.Attributes) {
	if a.IsEmpty() {
		return
	}
	v.b.WriteByte('{')
	for i, k := range a.Keys() {
		if i > 0 {
			v.b.WriteByte(' ')

			v.b.WriteBytes('\\', b)
			last = i + 1
		}
	}
	v.b.WriteString(s[last:])
}

func syntaxToHTML(a zjson.Attributes) zjson.Attributes {
	return a.Clone().Set("", api.ValueSyntaxHTML).Remove(api.KeySyntax)
}

	"context"
	"errors"
	"fmt"
	"strconv"
	"strings"

	"zettelstore.de/c/api"
	"zettelstore.de/c/zjson"
	"zettelstore.de/z/ast"
	"zettelstore.de/z/box"
	"zettelstore.de/z/config"
	"zettelstore.de/z/domain"
	"zettelstore.de/z/domain/id"
	"zettelstore.de/z/domain/meta"
	"zettelstore.de/z/input"
	"zettelstore.de/z/parser"
	"zettelstore.de/z/parser/cleaner"

)

// Environment contains values to control the evaluation.
type Environment struct {
	GetTagRef        func(string) *ast.Reference
	GetHostedRef     func(string) *ast.Reference
	GetFoundRef      func(zid id.Zid, fragment string) *ast.Reference
	GetImageMaterial func(zettel domain.Zettel, syntax string) ast.InlineEmbedNode
}

// Port contains all methods to retrieve zettel (or part of it) to evaluate a zettel.
type Port interface {
	GetMeta(context.Context, id.Zid) (*meta.Meta, error)
	GetZettel(context.Context, id.Zid) (domain.Zettel, error)
}

var emptyEnv Environment

// EvaluateZettel evaluates the given zettel in the given context, with the
// given ports, and the given environment.
func EvaluateZettel(ctx context.Context, port Port, env *Environment, rtConfig config.Config, zn *ast.ZettelNode) {
	if zn.Syntax == api.ValueSyntaxNone {
		// AST is empty, evaluate to a description list of metadata.
		zn.Ast = evaluateMetadata(zn.Meta)
		return
	}
	evaluateNode(ctx, port, env, rtConfig, &zn.Ast)
	cleaner.CleanBlockSlice(&zn.Ast)
}

// EvaluateInline evaluates the given inline list in the given context, with
// the given ports, and the given environment.
func EvaluateInline(ctx context.Context, port Port, env *Environment, rtConfig config.Config, is *ast.InlineSlice) {
	evaluateNode(ctx, port, env, rtConfig, is)
	cleaner.CleanInlineSlice(is)
}

func evaluateNode(ctx context.Context, port Port, env *Environment, rtConfig config.Config, n ast.Node) {
	if env == nil {
		env = &emptyEnv
	}
	e := evaluator{
		ctx:             ctx,
		port:            port,
		env:             env,
		rtConfig:        rtConfig,
		transcludeMax:   rtConfig.GetMaxTransclusions(),
		transcludeCount: 0,
		costMap:         map[id.Zid]transcludeCost{},
		embedMap:        map[string]ast.InlineSlice{},
		marker:          &ast.ZettelNode{},
	}
	ast.Walk(&e, n)
}

type evaluator struct {
	ctx             context.Context
	port            Port
	env             *Environment
	rtConfig        config.Config
	transcludeMax   int
	transcludeCount int
	costMap         map[id.Zid]transcludeCost
	marker          *ast.ZettelNode
	embedMap        map[string]ast.InlineSlice
}

	if i+1 < len(bns) {
		newIns = append(newIns, bns[i+1:]...)
	}
	return newIns
}

func (e *evaluator) evalVerbatimNode(vn *ast.VerbatimNode) ast.BlockNode {

	if vn.Kind != ast.VerbatimZettel {






		return vn
	}


	m := meta.New(id.Invalid)
	m.Set(api.KeySyntax, getSyntax(vn.Attrs, api.ValueSyntaxDraw))
	zettel := domain.Zettel{
		Meta:    m,
		Content: domain.NewContent(vn.Content),
	}
	e.transcludeCount++
	zn := e.evaluateEmbeddedZettel(zettel)
	return &zn.Ast
}

func getSyntax(a zjson.Attributes, defSyntax string) string {
	if a != nil {
		if val, ok := a.Get(api.KeySyntax); ok {
			return val
		}
		if val, ok := a.Get(""); ok {
			return val
		}

func makeBlockNode(in ast.InlineNode) ast.BlockNode { return ast.CreateParaNode(in) }

func (e *evaluator) visitInlineSlice(is *ast.InlineSlice) {
	for i := 0; i < len(*is); i++ {
		in := (*is)[i]
		ast.Walk(e, in)
		switch n := in.(type) {
		case *ast.TagNode:
			(*is)[i] = e.visitTag(n)
		case *ast.LinkNode:
			(*is)[i] = e.evalLinkNode(n)
		case *ast.EmbedRefNode:
			i += embedNode(is, i, e.evalEmbedRefNode(n))
		case *ast.LiteralNode:
			i += embedNode(is, i, e.evalLiteralNode(n))
		}

		newIns = append(newIns, replaceIns...)
	}
	if i+1 < len(ins) {
		newIns = append(newIns, ins[i+1:]...)
	}
	return newIns
}

func (e *evaluator) visitTag(tn *ast.TagNode) ast.InlineNode {
	if gtr := e.env.GetTagRef; gtr != nil {
		fullTag := "#" + tn.Tag
		return &ast.LinkNode{
			Ref:     e.env.GetTagRef(fullTag),
			Inlines: ast.CreateInlineSliceFromWords(fullTag),
		}
	}
	return tn
}

func (e *evaluator) evalLinkNode(ln *ast.LinkNode) ast.InlineNode {
	ref := ln.Ref
	if ref == nil {
		return ln
	}
	if ref.State == ast.RefStateBased {
		if ghr := e.env.GetHostedRef; ghr != nil {
			ln.Ref = ghr(ref.Value[1:])
		}
		return ln
	}
	if ref.State != ast.RefStateZettel {
		return ln
	}

	zid := mustParseZid(ref)
	_, err := e.port.GetMeta(box.NoEnrichContext(e.ctx), zid)
	if errors.Is(err, &box.ErrNotAllowed{}) {
		return &ast.FormatNode{
			Kind:    ast.FormatSpan,
			Attrs:   ln.Attrs,
			Inlines: getLinkInline(ln),
		}
	} else if err != nil {
		ln.Ref.State = ast.RefStateBroken
		return ln
	}

	if gfr := e.env.GetFoundRef; gfr != nil {
		ln.Inlines = getLinkInline(ln)
		ln.Ref = gfr(zid, ref.URL.EscapedFragment())
	}
	return ln
}

func getLinkInline(ln *ast.LinkNode) ast.InlineSlice {
	if ln.Inlines != nil {
		return ln.Inlines
	}

	}

	switch ref.State {
	case ast.RefStateZettel:
		// Only zettel references will be evaluated.
	case ast.RefStateInvalid, ast.RefStateBroken:
		e.transcludeCount++
		return e.createInlineErrorImage(en)
	case ast.RefStateSelf:
		e.transcludeCount++
		return createInlineErrorText(ref, "Self", "embed", "reference:")
	case ast.RefStateFound, ast.RefStateHosted, ast.RefStateBased, ast.RefStateExternal:
		return en
	default:
		panic(fmt.Sprintf("Unknown state %v for reference %v", ref.State, ref))
	}

	zid := mustParseZid(ref)
	zettel, err := e.port.GetZettel(box.NoEnrichContext(e.ctx), zid)
	if err != nil {
		e.transcludeCount++
		return e.createInlineErrorImage(en)
	}

	if syntax := e.getSyntax(zettel.Meta); parser.IsImageFormat(syntax) {

		return e.embedImage(en, zettel)
	} else if !parser.IsTextParser(syntax) {
		// Not embeddable.
		e.transcludeCount++
		return createInlineErrorText(ref, "Not", "embeddable (syntax="+syntax+"):")
	}

	cost, ok := e.costMap[zid]

		// Search for text to be embedded.
		result = findInlineSlice(&zn.Ast, ref.URL.Fragment)
		e.embedMap[ref.Value] = result
	}
	if len(result) == 0 {
		return &ast.LiteralNode{
			Kind:    ast.LiteralComment,

			Content: append([]byte("Nothing to transclude: "), ref.String()...),
		}
	}

	if ec := cost.ec; ec > 0 {
		e.transcludeCount += cost.ec
	}

}

func (e *evaluator) evalLiteralNode(ln *ast.LiteralNode) ast.InlineNode {
	if ln.Kind != ast.LiteralZettel {
		return ln
	}
	e.transcludeCount++
	result := e.evaluateEmbeddedInline(ln.Content, getSyntax(ln.Attrs, api.ValueSyntaxDraw))
	if len(result) == 0 {
		return &ast.LiteralNode{
			Kind:    ast.LiteralComment,

			Content: []byte("Nothing to transclude"),
		}
	}
	return &result
}

func (e *evaluator) getSyntax(m *meta.Meta) string {
	if cfg := e.rtConfig; cfg != nil {
		return config.GetSyntax(m, cfg)
	}
	return m.GetDefault(api.KeySyntax, "")
}

func (e *evaluator) getTitle(m *meta.Meta) string {
	if cfg := e.rtConfig; cfg != nil {
		return config.GetTitle(m, cfg)
	}
	return m.GetDefault(api.KeyTitle, "")
}

func (e *evaluator) createInlineErrorImage(en *ast.EmbedRefNode) ast.InlineEmbedNode {
	errorZid := id.EmojiZid
	if gim := e.env.GetImageMaterial; gim != nil {
		zettel, err := e.port.GetZettel(box.NoEnrichContext(e.ctx), errorZid)
		if err != nil {
			panic(err)
		}
		inlines := en.Inlines
		if len(inlines) == 0 {
			if title := e.getTitle(zettel.Meta); title != "" {
				inlines = parser.ParseMetadata(title)
			}
		}
		syntax := e.getSyntax(zettel.Meta)
		return enrichImageNode(gim(zettel, syntax), inlines, en.Attrs, syntax)
	}
	en.Ref = ast.ParseReference(errorZid.String())
	if len(en.Inlines) == 0 {
		en.Inlines = parser.ParseMetadata("Error placeholder")
	}
	return en
}

func (e *evaluator) embedImage(en *ast.EmbedRefNode, zettel domain.Zettel) ast.InlineEmbedNode {
	syntax := e.getSyntax(zettel.Meta)
	if gim := e.env.GetImageMaterial; gim != nil {
		return enrichImageNode(gim(zettel, syntax), en.Inlines, en.Attrs, syntax)
	}
	en.Syntax = syntax
	return en
}

func enrichImageNode(result ast.InlineEmbedNode, in ast.InlineSlice, a zjson.Attributes, syntax string) ast.InlineEmbedNode {
	switch er := result.(type) {
	case *ast.EmbedRefNode:
		er.Inlines = in
		er.Attrs = a
		er.Syntax = syntax
	case *ast.EmbedBLOBNode:
		er.Inlines = in
		er.Attrs = a
	}
	return result
}

func createInlineErrorText(ref *ast.Reference, msgWords ...string) ast.InlineNode {
	text := strings.Join(msgWords, " ")
	if ref != nil {
		text += ": " + ref.String() + "."
	}
	ln := &ast.LiteralNode{