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

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

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

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

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

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

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

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

package api

import "fmt"

// Predefined Zettel Identifier

	MetaIDSet        = "IdentifierSet"
	MetaNumber       = "Number"
	MetaString       = "String"
	MetaTagSet       = "TagSet"
	MetaTimestamp    = "Timestamp"
	MetaURL          = "URL"
	MetaWord         = "Word"
	MetaWordSet      = "WordSet"
	MetaZettelmarkup = "Zettelmarkup"
)

// Predefined general Metadata keys
const (
	KeyID           = "id"
	KeyTitle        = "title"

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

	ActionSeparator = "|"

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

	ExistOperator    = "?"
	ExistNotOperator = "!?"

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

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

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

package api

import (
	"net/url"
	"strings"

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

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

import (
	"strings"

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

package attrs_test

import (
	"testing"

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

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

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

	"zettelstore.de/client.fossil/api"
	"zettelstore.de/client.fossil/sexp"
	"zettelstore.de/client.fossil/sz"
	"zettelstore.de/sx.fossil"
	"zettelstore.de/sx.fossil/sxreader"
)

// Client contains all data to execute requests.
type Client struct {
	base      string

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

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

func (c *Client) executeRequest(req *http.Request) (*http.Response, error) {

	if err != nil {
		return err
	}
	vals, err := sexp.ParseList(obj, "ssi")
	if err != nil {
		return err
	}
	token := string(vals[1].(sx.String))
	token := vals[1].(sx.String).String()
	if len(token) < 4 {
		return fmt.Errorf("no valid token found: %q", token)
	}
	c.token = token
	c.tokenType = string(vals[0].(sx.String))
	c.tokenType = vals[0].(sx.String).String()
	c.expires = time.Now().Add(time.Duration(vals[2].(sx.Int64)*9/10) * time.Second)
	return nil
}

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

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

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

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

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

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

// QueryZettel returns a list of all Zettel.
func (c *Client) QueryZettel(ctx context.Context, query string) ([][]byte, error) {
	ub := c.NewURLBuilder('z').AppendQuery(query)
	ub := c.newURLBuilder('z').AppendQuery(query)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	data, err := io.ReadAll(resp.Body)
	switch resp.StatusCode {

		lines = lines[:len(lines)-1]
	}
	return lines, nil
}

// QueryZettelData returns a list of zettel metadata.
func (c *Client) QueryZettelData(ctx context.Context, query string) (string, string, []api.ZidMetaRights, error) {
	ub := c.NewURLBuilder('z').AppendKVQuery(api.QueryKeyEncoding, api.EncodingData).AppendQuery(query)
	ub := c.newURLBuilder('z').AppendKVQuery(api.QueryKeyEncoding, api.EncodingData).AppendQuery(query)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return "", "", nil, err
	}
	defer resp.Body.Close()
	rdr := sxreader.MakeReader(resp.Body)
	obj, err := rdr.Read()

		return "", "", nil, err
	}
	hVals, err := sexp.ParseList(vals[2], "ys")
	if err != nil {
		return "", "", nil, err
	}
	metaList, err := parseMetaList(vals[3].(*sx.Pair))
	return sz.GoValue(qVals[1]), sz.GoValue(hVals[1]), metaList, err
	return qVals[1].String(), hVals[1].String(), metaList, err
}

func parseMetaList(metaPair *sx.Pair) ([]api.ZidMetaRights, error) {
	if metaPair == nil {
		return nil, fmt.Errorf("no zettel list")
	}
	if errSym := sexp.CheckSymbol(metaPair.Car(), "list"); errSym != nil {

		return api.InvalidZID, fmt.Errorf("invalid zettel ID: %v", val)
	}
	return zid, nil
}

// QueryAggregate returns a aggregate as a result of a query.
// It is most often used in a query with an action, where the action is either
// a metadata key of type Word or of type TagSet.
// a metadata key of type Word, WordSet, or TagSet.
func (c *Client) QueryAggregate(ctx context.Context, query string) (api.Aggregate, error) {
	lines, err := c.QueryZettel(ctx, query)
	if err != nil {
		return nil, err
	}
	if len(lines) == 0 {
		return nil, nil

	return c.fetchTagOrRoleZettel(ctx, api.QueryKeyRole, role)
}

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

	default:
		return api.InvalidZID, statusToError(resp)
	}
}

// GetZettel returns a zettel as a string.
func (c *Client) GetZettel(ctx context.Context, zid api.ZettelID, part string) ([]byte, error) {
	ub := c.NewURLBuilder('z').SetZid(zid)
	ub := c.newURLBuilder('z').SetZid(zid)
	if part != "" && part != api.PartContent {
		ub.AppendKVQuery(api.QueryKeyPart, part)
	}
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return nil, err
	}

		return nil, statusToError(resp)
	}
	return data, err
}

// GetZettelData returns a zettel as a struct of its parts.
func (c *Client) GetZettelData(ctx context.Context, zid api.ZettelID) (api.ZettelData, error) {
	ub := c.NewURLBuilder('z').SetZid(zid)
	ub := c.newURLBuilder('z').SetZid(zid)
	ub.AppendKVQuery(api.QueryKeyEncoding, api.EncodingData)
	ub.AppendKVQuery(api.QueryKeyPart, api.PartZettel)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err == nil {
		defer resp.Body.Close()
		if resp.StatusCode != http.StatusOK {
			return api.ZettelData{}, statusToError(resp)

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

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

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

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

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

// GetMetaData returns the metadata of a zettel.
func (c *Client) GetMetaData(ctx context.Context, zid api.ZettelID) (api.MetaRights, error) {
	ub := c.NewURLBuilder('z').SetZid(zid)
	ub := c.newURLBuilder('z').SetZid(zid)
	ub.AppendKVQuery(api.QueryKeyEncoding, api.EncodingData)
	ub.AppendKVQuery(api.QueryKeyPart, api.PartMeta)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return api.MetaRights{}, err
	}
	defer resp.Body.Close()

		Meta:   meta,
		Rights: rights,
	}, nil
}

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

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

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

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

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

// GetVersionInfo returns version information..
func (c *Client) GetVersionInfo(ctx context.Context) (VersionInfo, error) {
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, c.NewURLBuilder('x'), nil, nil)
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, c.newURLBuilder('x'), nil, nil)
	if err != nil {
		return VersionInfo{}, err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return VersionInfo{}, statusToError(resp)
	}
	rdr := sxreader.MakeReader(resp.Body)
	obj, err := rdr.Read()
	if err == nil {
		if vals, errVals := sexp.ParseList(obj, "iiiss"); errVals == nil {
			return VersionInfo{
				Major: int(vals[0].(sx.Int64)),
				Minor: int(vals[1].(sx.Int64)),
				Patch: int(vals[2].(sx.Int64)),
				Info:  string(vals[3].(sx.String)),
				Hash:  string(vals[4].(sx.String)),
				Info:  vals[3].(sx.String).String(),
				Hash:  vals[4].(sx.String).String(),
			}, nil
		}
	}
	return VersionInfo{}, err
}

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

// Get executes a GET request to the given URL and returns the read data.
func (c *Client) Get(ctx context.Context, ub *api.URLBuilder) ([]byte, error) {
	resp, err := c.buildAndExecuteRequest(ctx, http.MethodGet, ub, nil, nil)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	switch resp.StatusCode {
	case http.StatusOK:
	case http.StatusNoContent:
		return nil, nil
	default:
		return nil, statusToError(resp)
	}
	data, err := io.ReadAll(resp.Body)
	return data, err
}

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

package client_test

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

	"zettelstore.de/client.fossil/api"
	"zettelstore.de/client.fossil/client"
	"zettelstore.de/client.fossil/sz"
	"zettelstore.de/sx.fossil"
)

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

		}
		return
	}
}

func TestGetSzZettel(t *testing.T) {
	c := getClient()
	sf := sx.MakeMappedFactory(1024)
	var zetSyms sz.ZettelSymbols
	zetSyms.InitializeZettelSymbols(sf)
	value, err := c.GetEvaluatedSz(context.Background(), api.ZidDefaultHome, api.PartContent)
	value, err := c.GetEvaluatedSz(context.Background(), api.ZidDefaultHome, api.PartContent, sf)
	if err != nil {
		t.Error(err)
		return
	}
	if value.IsNil() {
		t.Error("No data")
	}

module zettelstore.de/client.fossil

go 1.22
go 1.21

require zettelstore.de/sx.fossil v0.0.0-20240304124557-67e0a1799d1d
require zettelstore.de/sx.fossil v0.0.0-20231130150648-05ef116ba207

zettelstore.de/sx.fossil v0.0.0-20240304124557-67e0a1799d1d h1:Gl5ZmdNV5wJsNMIQYjAd/sWLq2ng4NP+eglWU7lQP+I=
zettelstore.de/sx.fossil v0.0.0-20240304124557-67e0a1799d1d/go.mod h1:/iGHxFXoo6GSV04PUkwaLuFrrCa5LMorxD73iLMAruI=
zettelstore.de/sx.fossil v0.0.0-20231130150648-05ef116ba207 h1:8ch54z0w53bps6a00NDofEqo3AJ1l7ITXyC3XyLmlY4=
zettelstore.de/sx.fossil v0.0.0-20231130150648-05ef116ba207/go.mod h1:Uw3OLM1ufOM4Xe0G51mvkTDUv2okd+HyDBMx+0ZG7ME=

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

package input

import (
	"html"
	"unicode"
)

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

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

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

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

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

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

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

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

package input_test

import (
	"testing"

	"zettelstore.de/client.fossil/input"
)

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

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

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

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

import "unicode/utf8"

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

import (
	"testing"

	"zettelstore.de/client.fossil/input"
)

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

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

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

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

package input

import "unicode"

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

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

package maps

import "sort"

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

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

package maps_test

import (
	"testing"

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

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

import (
	"errors"
	"fmt"
	"sort"

	"zettelstore.de/client.fossil/api"
	"zettelstore.de/sx.fossil"
)

// EncodeZettel transforms zettel data into a sx object.
func EncodeZettel(zettel api.ZettelData) sx.Object {
	sf := sx.MakeMappedFactory(1024)
	return sx.MakeList(
		sx.MakeSymbol("zettel"),
		meta2sz(zettel.Meta),
		sx.MakeList(sx.MakeSymbol("rights"), sx.Int64(int64(zettel.Rights))),
		sx.MakeList(sx.MakeSymbol("encoding"), sx.String(zettel.Encoding)),
		sx.MakeList(sx.MakeSymbol("content"), sx.String(zettel.Content)),
		sf.MustMake("zettel"),
		meta2sz(zettel.Meta, sf),
		sx.MakeList(sf.MustMake("rights"), sx.Int64(int64(zettel.Rights))),
		sx.MakeList(sf.MustMake("encoding"), sx.String(zettel.Encoding)),
		sx.MakeList(sf.MustMake("content"), sx.String(zettel.Content)),
	)
}

func ParseZettel(obj sx.Object) (api.ZettelData, error) {
	vals, err := ParseList(obj, "ypppp")
	if err != nil {
		return api.ZettelData{}, err

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

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

// EncodeMetaRights translates metadata/rights into a sx object.
func EncodeMetaRights(mr api.MetaRights) *sx.Pair {
	sf := sx.MakeMappedFactory(1024)
	return sx.MakeList(
		sx.SymbolList,
		meta2sz(mr.Meta),
		sx.MakeList(sx.MakeSymbol("rights"), sx.Int64(int64(mr.Rights))),
		sf.MustMake("list"),
		meta2sz(mr.Meta, sf),
		sx.MakeList(sf.MustMake("rights"), sx.Int64(int64(mr.Rights))),
	)
}

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

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

// ParseRights returns the rights values of the given object.
func ParseRights(obj sx.Object) (api.ZettelRights, error) {
	rVals, err := ParseList(obj, "yi")

	if i64 < 0 && i64 >= int64(api.ZettelMaxRight) {
		return api.ZettelMaxRight, fmt.Errorf("invalid zettel right value: %v", i64)
	}
	return api.ZettelRights(i64), nil
}

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

	result := make(sx.Vector, 0, len(spec))
	result := make([]sx.Object, 0, len(spec))
	node, i := pair, 0
	for ; node != nil; i++ {
		if i >= len(spec) {
			return nil, ErrNoSpec
		}
		var val sx.Object
		var ok bool

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

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

package sexp_test

import (
	"testing"

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

package shtml

import "zettelstore.de/sx.fossil"

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

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

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

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

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

import (
	"fmt"

	"zettelstore.de/sx.fossil"
	"zettelstore.de/sx.fossil/sxhtml"
)

// Evaluator will transform a s-expression that encodes the zettel AST into an s-expression
// that represents HTML.
type Evaluator struct {
	sf            sx.SymbolFactory
	headingOffset int64
	unique        string
	noLinks       bool // true iff output must not include links

	symAttr     *sx.Symbol
	symList     *sx.Symbol
	symNoEscape *sx.Symbol
	symClass    *sx.Symbol
	symMeta     *sx.Symbol
	symP        *sx.Symbol
	symLI       *sx.Symbol
	symA        *sx.Symbol
	symHREF     *sx.Symbol
	symSpan     *sx.Symbol

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

// NewEvaluator creates a new Evaluator object.
func NewEvaluator(headingOffset int) *Evaluator {
func NewEvaluator(headingOffset int, sf sx.SymbolFactory) *Evaluator {
	if sf == nil {
		sf = sx.MakeMappedFactory(128)
	}
	ev := &Evaluator{
		sf:            sf,
		headingOffset: int64(headingOffset),
		symAttr:       sf.MustMake(sxhtml.NameSymAttr),
		symList:       sf.MustMake(sxhtml.NameSymList),
		symNoEscape:   sf.MustMake(sxhtml.NameSymNoEscape),
		symClass:      sf.MustMake("class"),
		symMeta:       sf.MustMake("meta"),
		symP:          sf.MustMake("p"),
		symLI:         sf.MustMake("li"),
		symA:          sf.MustMake("a"),
		symHREF:       sf.MustMake("href"),
		symSpan:       sf.MustMake("span"),

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

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

// SymbolFactory returns the symbol factory of this evaluator.
func (ev *Evaluator) SymbolFactory() sx.SymbolFactory { return ev.sf }

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

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

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

// Evaluate a metadata s-expression into a list of HTML s-expressions.
func (ev *Evaluator) Evaluate(lst *sx.Pair, env *Environment) (*sx.Pair, error) {
	result := ev.Eval(lst, env)
	result := ev.eval(lst, env)
	if err := env.err; err != nil {
		return nil, err
	}
	pair, isPair := sx.GetPair(result)
	if !isPair {
		return nil, fmt.Errorf("evaluation does not result in a pair, but %T/%v", result, result)
	}

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

		if env.endnotes[i].noteHx != nil {
			continue
		}

		noteHx, _ := ev.EvaluateList(env.endnotes[i].noteAST, env)
		objHx := ev.eval(env.endnotes[i].noteAST, env)
		if env.err != nil {
			break
		}
		noteHx, isHx := sx.GetPair(objHx)
		if !isHx {
			return nil, fmt.Errorf("endnote evaluation does not result in pair, but %T/%v", objHx, objHx)
		}
		env.endnotes[i].noteHx = noteHx
	}

	return pair, nil
}

// EvaluateList will evaluate all list elements separately and returns them as a sx.Pair list
func (ev *Evaluator) EvaluateList(lst sx.Vector, env *Environment) (*sx.Pair, error) {
	var result sx.ListBuilder
	for _, elem := range lst {
		p := ev.Eval(elem, env)
		result.Add(p)
	}
	if err := env.err; err != nil {
		return nil, err
	}
	return result.List(), nil
}

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

	var result sx.ListBuilder
	result.Add(SymOL)
	result.Add(sx.Nil().Cons(sx.Cons(SymAttrClass, sx.String("zs-endnotes"))).Cons(sxhtml.SymAttr))
	result := sx.Nil().Cons(ev.Make("ol"))
	symValue, symId, symRole := ev.Make("value"), ev.Make("id"), ev.Make("role")

	currResult := result.AppendBang(sx.Nil().Cons(sx.Cons(ev.symClass, sx.String("zs-endnotes"))).Cons(ev.symAttr))
	for i, fni := range env.endnotes {
		noteNum := strconv.Itoa(i + 1)
		attrs := fni.attrs.Cons(sx.Cons(SymAttrClass, sx.String("zs-endnote"))).
			Cons(sx.Cons(SymAttrValue, sx.String(noteNum))).
			Cons(sx.Cons(SymAttrId, sx.String("fn:"+fni.noteID))).
			Cons(sx.Cons(SymAttrRole, sx.String("doc-endnote"))).
			Cons(sxhtml.SymAttr)
		attrs := fni.attrs.Cons(sx.Cons(ev.symClass, sx.String("zs-endnote"))).
			Cons(sx.Cons(symValue, sx.String(noteNum))).
			Cons(sx.Cons(symId, sx.String("fn:"+fni.noteID))).
			Cons(sx.Cons(symRole, sx.String("doc-endnote"))).
			Cons(ev.symAttr)

		backref := sx.Nil().Cons(sx.String("\u21a9\ufe0e")).
			Cons(sx.Nil().
				Cons(sx.Cons(SymAttrClass, sx.String("zs-endnote-backref"))).
				Cons(sx.Cons(SymAttrHref, sx.String("#fnref:"+fni.noteID))).
				Cons(sx.Cons(SymAttrRole, sx.String("doc-backlink"))).
				Cons(sxhtml.SymAttr)).
			Cons(SymA)
				Cons(sx.Cons(ev.symClass, sx.String("zs-endnote-backref"))).
				Cons(sx.Cons(ev.symHREF, sx.String("#fnref:"+fni.noteID))).
				Cons(sx.Cons(symRole, sx.String("doc-backlink"))).
				Cons(ev.symAttr)).
			Cons(ev.symA)

		var li sx.ListBuilder
		li.Add(SymLI)
		li.Add(attrs)
		li.ExtendBang(fni.noteHx)
		li.Add(sx.String(" "))
		li := sx.Nil().Cons(ev.symLI)
		li.AppendBang(attrs).
			ExtendBang(fni.noteHx).
			AppendBang(sx.String(" ")).AppendBang(backref)
		li.Add(backref)
		result.Add(li.List())
		currResult = currResult.AppendBang(li)
	}
	return result.List()
	return result
}

// Environment where sz objects are evaluated to shtml objects
type Environment struct {
	err          error
	langStack    []string
	endnotes     []endnoteInfo
	quoteNesting uint
}
type endnoteInfo struct {
	noteID  string    // link id
	noteAST sx.Vector // Endnote as list of AST inline elements
	noteAST sx.Object // Endnote as AST
	attrs   *sx.Pair  // attrs a-list
	noteHx  *sx.Pair  // Endnote as SxHTML
}

// MakeEnvironment builds a new evaluation environment.
func MakeEnvironment(lang string) Environment {
	langStack := make([]string, 1, 16)

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

// EvalFn is a function to be called for evaluation.
type EvalFn func(sx.Vector, *Environment) sx.Object
type EvalFn func([]sx.Object, *Environment) sx.Object

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

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

// Rebind overwrites a binding, but leaves the minimum number of arguments intact.
func (ev *Evaluator) Rebind(sym *sx.Symbol, fn EvalFn) {
func (ev *Evaluator) Rebind(name string, fn EvalFn) {
	symVal := sym.GetValue()
	if _, found := ev.fns[symVal]; !found {
		panic(sym)
	if _, found := ev.fns[name]; !found {
		panic(name)
	}
	ev.fns[symVal] = fn
	ev.fns[name] = fn
}

func (ev *Evaluator) bindCommon() {
	ev.bind(sx.ListName, 0, ev.evalList)
	ev.bind("quote", 1, func(args []sx.Object, _ *Environment) sx.Object { return args[0] })
}

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

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

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

func (ev *Evaluator) bindBlocks() {
	ev.bind(sz.SymBlock, 0, ev.evalList)
	ev.bind(sz.SymPara, 0, func(args sx.Vector, env *Environment) sx.Object {
		return ev.evalSlice(args, env).Cons(SymP)
	ev.bind(sz.NameSymBlock, 0, ev.evalList)
	ev.bind(sz.NameSymPara, 0, func(args []sx.Object, env *Environment) sx.Object {
		return ev.evalSlice(args, env).Cons(ev.symP)
	})
	ev.bind(sz.SymHeading, 5, func(args sx.Vector, env *Environment) sx.Object {
	ev.bind(sz.NameSymHeading, 5, func(args []sx.Object, env *Environment) sx.Object {
		nLevel := getInt64(args[0], env)
		if nLevel <= 0 {
			env.err = fmt.Errorf("%v is a negative level", nLevel)
			return sx.Nil()
		}
		level := strconv.FormatInt(nLevel+ev.headingOffset, 10)
		headingSymbol := sx.MakeSymbol("h" + level)

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

		if result, _ := ev.EvaluateList(args[4:], env); result != nil {
		if result, isPair := sx.GetPair(ev.eval(args[4], env)); isPair && result != nil {
			if len(a) > 0 {
				result = result.Cons(ev.EvaluateAttrbute(a))
			}
			return result.Cons(headingSymbol)
			return result.Cons(ev.Make("h" + level))
		}
		return sx.MakeList(headingSymbol, sx.String("<MISSING TEXT>"))
		return sx.MakeList(ev.Make("h"+level), sx.String("<MISSING TEXT>"))
	})
	ev.bind(sz.SymThematic, 0, func(args sx.Vector, env *Environment) sx.Object {
	ev.bind(sz.NameSymThematic, 0, func(args []sx.Object, env *Environment) sx.Object {
		result := sx.Nil()
		if len(args) > 0 {
			if attrList := getList(args[0], env); attrList != nil {
			if attrList := getList(ev.eval(args[0], env), env); attrList != nil {
				result = result.Cons(ev.EvaluateAttrbute(sz.GetAttributes(attrList)))
			}
		}
		return result.Cons(SymHR)
		return result.Cons(ev.Make("hr"))
	})

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

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

		var tbody sx.ListBuilder
		tbody := sx.Nil()
		if len(args) > 1 {
			tbody = sx.Nil().Cons(ev.Make("tbody"))
			tbody.Add(symTBODY)
			curBody := tbody
			for _, row := range args[1:] {
				tbody.Add(ev.evalTableRow(getList(row, env), env))
				curBody = curBody.AppendBang(ev.evalTableRow(getList(ev.eval(row, env), env)))
			}
		}

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

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

	ev.bind(sz.SymVerbatimComment, 1, func(args sx.Vector, env *Environment) sx.Object {
		if ev.GetAttributes(args[0], env).HasDefault() {
	ev.bind(sz.NameSymVerbatimComment, 1, func(args []sx.Object, env *Environment) sx.Object {
		if ev.getAttributes(args[0], env).HasDefault() {
			if len(args) > 1 {
				if s := getString(args[1], env); s != "" {
					t := sx.String(s.String())
					return sx.Nil().Cons(s).Cons(sxhtml.SymBlockComment)
					return sx.Nil().Cons(t).Cons(ev.Make(sxhtml.NameSymBlockComment))
				}
			}
		}
		return nil
	})
	ev.bind(sz.SymVerbatimEval, 2, func(args sx.Vector, env *Environment) sx.Object {
		return ev.evalVerbatim(ev.GetAttributes(args[0], env).AddClass("zs-eval"), getString(args[1], env))
	ev.bind(sz.NameSymVerbatimEval, 2, func(args []sx.Object, env *Environment) sx.Object {
		return ev.evalVerbatim(ev.getAttributes(args[0], env).AddClass("zs-eval"), getString(args[1], env))
	})
	ev.bind(sz.SymVerbatimHTML, 2, ev.evalHTML)
	ev.bind(sz.SymVerbatimMath, 2, func(args sx.Vector, env *Environment) sx.Object {
		return ev.evalVerbatim(ev.GetAttributes(args[0], env).AddClass("zs-math"), getString(args[1], env))
	ev.bind(sz.NameSymVerbatimHTML, 2, ev.evalHTML)
	ev.bind(sz.NameSymVerbatimMath, 2, func(args []sx.Object, env *Environment) sx.Object {
		return ev.evalVerbatim(ev.getAttributes(args[0], env).AddClass("zs-math"), getString(args[1], env))
	})
	ev.bind(sz.SymVerbatimProg, 2, func(args sx.Vector, env *Environment) sx.Object {
		a := ev.GetAttributes(args[0], env)
	ev.bind(sz.NameSymVerbatimProg, 2, func(args []sx.Object, env *Environment) sx.Object {
		a := ev.getAttributes(args[0], env)
		content := getString(args[1], env)
		if a.HasDefault() {
			content = sx.String(visibleReplacer.Replace(string(content)))
			content = sx.String(visibleReplacer.Replace(content.String()))
		}
		return ev.evalVerbatim(a, content)
	})
	ev.bind(sz.SymVerbatimZettel, 0, nilFn)
	ev.bind(sz.SymBLOB, 3, func(args sx.Vector, env *Environment) sx.Object {
	ev.bind(sz.NameSymVerbatimZettel, 0, nilFn)
	ev.bind(sz.NameSymBLOB, 3, func(args []sx.Object, env *Environment) sx.Object {
		return ev.evalBLOB(getList(args[0], env), getString(args[1], env), getString(args[2], env))
	})
	ev.bind(sz.SymTransclude, 2, func(args sx.Vector, env *Environment) sx.Object {
		ref, isPair := sx.GetPair(args[1])
	ev.bind(sz.NameSymTransclude, 2, func(args []sx.Object, env *Environment) sx.Object {
		ref, isPair := sx.GetPair(ev.eval(args[1], env))
		if !isPair {
			return sx.Nil()
		}
		refKind := ref.Car()
		if sx.IsNil(refKind) {
			return sx.Nil()
		}
		if refValue := getString(ref.Tail().Car(), env); refValue != "" {
			if refSym, isRefSym := sx.GetSymbol(refKind); isRefSym && refSym.IsEqual(sz.SymRefStateExternal) {
				a := ev.GetAttributes(args[0], env).Set("src", string(refValue)).AddClass("external")
				return sx.Nil().Cons(sx.Nil().Cons(ev.EvaluateAttrbute(a)).Cons(SymIMG)).Cons(SymP)
			if refSym, isRefSym := sx.GetSymbol(refKind); isRefSym && refSym.Name() == sz.NameSymRefStateExternal {
				a := ev.getAttributes(args[0], env).Set("src", refValue.String()).AddClass("external")
				return sx.Nil().Cons(sx.Nil().Cons(ev.EvaluateAttrbute(a)).Cons(ev.Make("img"))).Cons(ev.symP)
			}
			return sx.MakeList(
				sxhtml.SymInlineComment,
				ev.Make(sxhtml.NameSymInlineComment),
				sx.String("transclude"),
				refKind,
				sx.String("->"),
				refValue,
			)
		}
		return ev.evalSlice(args, env)
	})
}

func (ev *Evaluator) makeListFn(sym *sx.Symbol) EvalFn {
	return func(args sx.Vector, env *Environment) sx.Object {
		var result sx.ListBuilder
		result.Add(sym)
func (ev *Evaluator) makeListFn(tag string) EvalFn {
	sym := ev.Make(tag)
	return func(args []sx.Object, env *Environment) sx.Object {
		result := sx.Nil().Cons(sym)
		last := result
		for _, elem := range args {
			item := sx.Nil().Cons(SymLI)
			if res, isPair := sx.GetPair(ev.Eval(elem, env)); isPair {
			item := sx.Nil().Cons(ev.symLI)
			if res, isPair := sx.GetPair(ev.eval(elem, env)); isPair {
				item.ExtendBang(res)
			}
			result.Add(item)
			last = last.AppendBang(item)
		}
		return result.List()
		return result
	}
}

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

func (ev *Evaluator) evalTableRow(pairs *sx.Pair, env *Environment) *sx.Pair {
func (ev *Evaluator) evalTableRow(pairs *sx.Pair) *sx.Pair {
	row := sx.Nil().Cons(ev.Make("tr"))
	if pairs == nil {
		return nil
	}
	var row sx.ListBuilder
	curRow := row
	row.Add(symTR)
	for pair := pairs; pair != nil; pair = pair.Tail() {
		row.Add(ev.Eval(pair.Car(), env))
		curRow = curRow.AppendBang(pair.Car())
	}
	return row.List()
	return row
}
func (ev *Evaluator) makeCellFn(align string) EvalFn {
	return func(args sx.Vector, env *Environment) sx.Object {
	return func(args []sx.Object, env *Environment) sx.Object {
		tdata := ev.evalSlice(args, env)
		if align != "" {
			tdata = tdata.Cons(ev.EvaluateAttrbute(attrs.Attributes{"class": align}))
		}
		return tdata.Cons(symTD)
		return tdata.Cons(ev.Make("td"))
	}
}

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

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

func (ev *Evaluator) bindInlines() {
	ev.bind(sz.SymInline, 0, ev.evalList)
	ev.bind(sz.SymText, 1, func(args sx.Vector, env *Environment) sx.Object { return getString(args[0], env) })
	ev.bind(sz.SymSpace, 0, func(args sx.Vector, env *Environment) sx.Object {
	ev.bind(sz.NameSymInline, 0, ev.evalList)
	ev.bind(sz.NameSymText, 1, func(args []sx.Object, env *Environment) sx.Object { return getString(args[0], env) })
	ev.bind(sz.NameSymSpace, 0, func(args []sx.Object, env *Environment) sx.Object {
		if len(args) == 0 {
			return sx.String(" ")
		}
		return getString(args[0], env)
	})
	ev.bind(sz.SymSoft, 0, func(sx.Vector, *Environment) sx.Object { return sx.String(" ") })
	ev.bind(sz.SymHard, 0, func(sx.Vector, *Environment) sx.Object { return sx.Nil().Cons(symBR) })
	ev.bind(sz.NameSymSoft, 0, func([]sx.Object, *Environment) sx.Object { return sx.String(" ") })
	symBR := ev.Make("br")
	ev.bind(sz.NameSymHard, 0, func([]sx.Object, *Environment) sx.Object { return sx.Nil().Cons(symBR) })

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

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

	ev.bind(sz.SymCite, 2, func(args sx.Vector, env *Environment) sx.Object {
		a := ev.GetAttributes(args[0], env)
	ev.bind(sz.NameSymCite, 2, func(args []sx.Object, env *Environment) sx.Object {
		a := ev.getAttributes(args[0], env)
		env.pushAttributes(a)
		defer env.popAttributes()
		result := sx.Nil()
		if key := getString(args[1], env); key != "" {
			if len(args) > 2 {
				result = ev.evalSlice(args[2:], env).Cons(sx.String(", "))
			}
			result = result.Cons(key)
		}
		if len(a) > 0 {
			result = result.Cons(ev.EvaluateAttrbute(a))
		}
		if result == nil {
			return nil
		}
		return result.Cons(SymSPAN)
		return result.Cons(ev.symSpan)
	})
	ev.bind(sz.SymMark, 3, func(args sx.Vector, env *Environment) sx.Object {
	ev.bind(sz.NameSymMark, 3, func(args []sx.Object, env *Environment) sx.Object {
		result := ev.evalSlice(args[3:], env)
		if !ev.noLinks {
			if fragment := getString(args[2], env); fragment != "" {
				a := attrs.Attributes{"id": string(fragment) + ev.unique}
				return result.Cons(ev.EvaluateAttrbute(a)).Cons(SymA)
				a := attrs.Attributes{"id": fragment.String() + ev.unique}
				return result.Cons(ev.EvaluateAttrbute(a)).Cons(ev.symA)
			}
		}
		return result.Cons(SymSPAN)
		return result.Cons(ev.symSpan)
	})
	ev.bind(sz.SymEndnote, 1, func(args sx.Vector, env *Environment) sx.Object {
		a := ev.GetAttributes(args[0], env)
	ev.bind(sz.NameSymEndnote, 1, func(args []sx.Object, env *Environment) sx.Object {
		a := ev.getAttributes(args[0], env)
		env.pushAttributes(a)
		defer env.popAttributes()
		attrPlist := sx.Nil()
		if len(a) > 0 {
			if attrs := ev.EvaluateAttrbute(a); attrs != nil {
				attrPlist = attrs.Tail()
			}
		}

		text, isPair := sx.GetPair(args[1])
		if !isPair {
			return sx.Nil()
		}
		noteNum := strconv.Itoa(len(env.endnotes) + 1)
		noteID := ev.unique + noteNum
		env.endnotes = append(env.endnotes, endnoteInfo{
			noteID: noteID, noteAST: args[1:], noteHx: nil, attrs: attrPlist})
		hrefAttr := sx.Nil().Cons(sx.Cons(SymAttrRole, sx.String("doc-noteref"))).
			Cons(sx.Cons(SymAttrHref, sx.String("#fn:"+noteID))).
			Cons(sx.Cons(SymAttrClass, sx.String("zs-noteref"))).
			Cons(sxhtml.SymAttr)
		href := sx.Nil().Cons(sx.String(noteNum)).Cons(hrefAttr).Cons(SymA)
		supAttr := sx.Nil().Cons(sx.Cons(SymAttrId, sx.String("fnref:"+noteID))).Cons(sxhtml.SymAttr)
		return sx.Nil().Cons(href).Cons(supAttr).Cons(symSUP)
			noteID: noteID, noteAST: ev.eval(text, env), noteHx: nil, attrs: attrPlist})
		hrefAttr := sx.Nil().Cons(sx.Cons(ev.Make("role"), sx.String("doc-noteref"))).
			Cons(sx.Cons(ev.symHREF, sx.String("#fn:"+noteID))).
			Cons(sx.Cons(ev.symClass, sx.String("zs-noteref"))).
			Cons(ev.symAttr)
		href := sx.Nil().Cons(sx.String(noteNum)).Cons(hrefAttr).Cons(ev.symA)
		supAttr := sx.Nil().Cons(sx.Cons(ev.Make("id"), sx.String("fnref:"+noteID))).Cons(ev.symAttr)
		return sx.Nil().Cons(href).Cons(supAttr).Cons(ev.Make("sup"))
	})

	ev.bind(sz.SymFormatDelete, 1, ev.makeFormatFn(symDEL))
	ev.bind(sz.SymFormatEmph, 1, ev.makeFormatFn(symEM))
	ev.bind(sz.SymFormatInsert, 1, ev.makeFormatFn(symINS))
	ev.bind(sz.SymFormatMark, 1, ev.makeFormatFn(symMARK))
	ev.bind(sz.SymFormatQuote, 1, ev.evalQuote)
	ev.bind(sz.SymFormatSpan, 1, ev.makeFormatFn(SymSPAN))
	ev.bind(sz.SymFormatStrong, 1, ev.makeFormatFn(SymSTRONG))
	ev.bind(sz.SymFormatSub, 1, ev.makeFormatFn(symSUB))
	ev.bind(sz.SymFormatSuper, 1, ev.makeFormatFn(symSUP))
	ev.bind(sz.NameSymFormatDelete, 1, ev.makeFormatFn("del"))
	ev.bind(sz.NameSymFormatEmph, 1, ev.makeFormatFn("em"))
	ev.bind(sz.NameSymFormatInsert, 1, ev.makeFormatFn("ins"))
	ev.bind(sz.NameSymFormatMark, 1, ev.makeFormatFn("mark"))
	ev.bind(sz.NameSymFormatQuote, 1, ev.evalQuote)
	ev.bind(sz.NameSymFormatSpan, 1, ev.makeFormatFn("span"))
	ev.bind(sz.NameSymFormatStrong, 1, ev.makeFormatFn("strong"))
	ev.bind(sz.NameSymFormatSub, 1, ev.makeFormatFn("sub"))
	ev.bind(sz.NameSymFormatSuper, 1, ev.makeFormatFn("sup"))

	ev.bind(sz.SymLiteralComment, 1, func(args sx.Vector, env *Environment) sx.Object {
		if ev.GetAttributes(args[0], env).HasDefault() {
	ev.bind(sz.NameSymLiteralComment, 1, func(args []sx.Object, env *Environment) sx.Object {
		if ev.getAttributes(args[0], env).HasDefault() {
			if len(args) > 1 {
				if s := getString(ev.Eval(args[1], env), env); s != "" {
					return sx.Nil().Cons(s).Cons(sxhtml.SymInlineComment)
				if s := getString(ev.eval(args[1], env), env); s != "" {
					return sx.Nil().Cons(s).Cons(ev.Make(sxhtml.NameSymInlineComment))
				}
			}
		}
		return sx.Nil()
	})
	ev.bind(sz.SymLiteralHTML, 2, ev.evalHTML)
	ev.bind(sz.SymLiteralInput, 2, func(args sx.Vector, env *Environment) sx.Object {
		return ev.evalLiteral(args, nil, symKBD, env)
	ev.bind(sz.NameSymLiteralHTML, 2, ev.evalHTML)
	kbdSym := ev.Make("kbd")
	ev.bind(sz.NameSymLiteralInput, 2, func(args []sx.Object, env *Environment) sx.Object {
		return ev.evalLiteral(args, nil, kbdSym, env)
	})
	codeSym := ev.Make("code")
	ev.bind(sz.SymLiteralMath, 2, func(args sx.Vector, env *Environment) sx.Object {
		a := ev.GetAttributes(args[0], env).AddClass("zs-math")
		return ev.evalLiteral(args, a, symCODE, env)
	ev.bind(sz.NameSymLiteralMath, 2, func(args []sx.Object, env *Environment) sx.Object {
		a := ev.getAttributes(args[0], env).AddClass("zs-math")
		return ev.evalLiteral(args, a, codeSym, env)
	})
	sampSym := ev.Make("samp")
	ev.bind(sz.SymLiteralOutput, 2, func(args sx.Vector, env *Environment) sx.Object {
		return ev.evalLiteral(args, nil, symSAMP, env)
	ev.bind(sz.NameSymLiteralOutput, 2, func(args []sx.Object, env *Environment) sx.Object {
		return ev.evalLiteral(args, nil, sampSym, env)
	})
	ev.bind(sz.SymLiteralProg, 2, func(args sx.Vector, env *Environment) sx.Object {
		return ev.evalLiteral(args, nil, symCODE, env)
	ev.bind(sz.NameSymLiteralProg, 2, func(args []sx.Object, env *Environment) sx.Object {
		return ev.evalLiteral(args, nil, codeSym, env)
	})

	ev.bind(sz.SymLiteralZettel, 0, nilFn)
	ev.bind(sz.NameSymLiteralZettel, 0, nilFn)
}

func (ev *Evaluator) makeFormatFn(sym *sx.Symbol) EvalFn {
	return func(args sx.Vector, env *Environment) sx.Object {
		a := ev.GetAttributes(args[0], env)
func (ev *Evaluator) makeFormatFn(tag string) EvalFn {
	sym := ev.Make(tag)
	return func(args []sx.Object, env *Environment) sx.Object {
		a := ev.getAttributes(args[0], env)
		env.pushAttributes(a)
		defer env.popAttributes()
		if val, hasClass := a.Get(""); hasClass {
			a = a.Remove("").AddClass(val)
		}
		res := ev.evalSlice(args[1:], env)
		if len(a) > 0 {

func getQuotes(data *quoteData, env *Environment) (string, string) {
	if env.quoteNesting%2 == 0 {
		return data.primLeft, data.primRight
	}
	return data.secLeft, data.secRight
}

func (ev *Evaluator) evalQuote(args sx.Vector, env *Environment) sx.Object {
	a := ev.GetAttributes(args[0], env)
func (ev *Evaluator) evalQuote(args []sx.Object, env *Environment) sx.Object {
	a := ev.getAttributes(args[0], env)
	env.pushAttributes(a)
	defer env.popAttributes()

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

	env.quoteNesting++
	res := ev.evalSlice(args[1:], env)
	env.quoteNesting--

	lastPair := res.LastPair()
	if lastPair.IsNil() {
		res = sx.Cons(sx.MakeList(sxhtml.SymNoEscape, sx.String(leftQ), sx.String(rightQ)), sx.Nil())
		res = sx.Cons(sx.MakeList(ev.symNoEscape, sx.String(leftQ), sx.String(rightQ)), sx.Nil())
	} else {
		if quotes.nbsp {
			lastPair.AppendBang(sx.MakeList(sxhtml.SymNoEscape, sx.String(" "), sx.String(rightQ)))
			res = res.Cons(sx.MakeList(sxhtml.SymNoEscape, sx.String(leftQ), sx.String(" ")))
			lastPair.AppendBang(sx.MakeList(ev.symNoEscape, sx.String(" "), sx.String(rightQ)))
			res = res.Cons(sx.MakeList(ev.symNoEscape, sx.String(leftQ), sx.String(" ")))
		} else {
			lastPair.AppendBang(sx.MakeList(sxhtml.SymNoEscape, sx.String(rightQ)))
			res = res.Cons(sx.MakeList(sxhtml.SymNoEscape, sx.String(leftQ)))
			lastPair.AppendBang(sx.MakeList(ev.symNoEscape, sx.String(rightQ)))
			res = res.Cons(sx.MakeList(ev.symNoEscape, sx.String(leftQ)))
		}
	}
	if len(a) > 0 {
		res = res.Cons(ev.EvaluateAttrbute(a))
		return res.Cons(SymSPAN)
		return res.Cons(ev.symSpan)
	}
	return res.Cons(sxhtml.SymListSplice)
	return res.Cons(ev.symList)
}

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

func (ev *Evaluator) evalLiteral(args sx.Vector, a attrs.Attributes, sym *sx.Symbol, env *Environment) sx.Object {
func (ev *Evaluator) evalLiteral(args []sx.Object, a attrs.Attributes, sym *sx.Symbol, env *Environment) sx.Object {
	if a == nil {
		a = ev.GetAttributes(args[0], env)
		a = ev.getAttributes(args[0], env)
	}
	a = setProgLang(a)
	literal := string(getString(args[1], env))
	literal := getString(args[1], env).String()
	if a.HasDefault() {
		a = a.RemoveDefault()
		literal = visibleReplacer.Replace(literal)
	}
	res := sx.Nil().Cons(sx.String(literal))
	if len(a) > 0 {
		res = res.Cons(ev.EvaluateAttrbute(a))
	}
	return res.Cons(sym)
}
func setProgLang(a attrs.Attributes) attrs.Attributes {
	if val, found := a.Get(""); found {
		a = a.AddClass("language-" + val).Remove("")
	}
	return a
}

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

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

func flattenText(sb *strings.Builder, lst *sx.Pair) {
	for elem := lst; elem != nil; elem = elem.Tail() {
		switch obj := elem.Car().(type) {
		case sx.String:
			sb.WriteString(string(obj))
			sb.WriteString(obj.String())
		case *sx.Symbol:
			if obj.IsEqual(sz.SymSpace) {
			if obj.Name() == sz.NameSymSpace {
				sb.WriteByte(' ')
				break
			}
		case *sx.Pair:
			flattenText(sb, obj)
		}
	}
}

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

// Eval evaluates an object in an environment.
func (ev *Evaluator) Eval(obj sx.Object, env *Environment) sx.Object {
func (ev *Evaluator) eval(obj sx.Object, env *Environment) sx.Object {
	if env.err != nil {
		return sx.Nil()
	}
	if sx.IsNil(obj) {
		return obj
	}
	lst, isLst := sx.GetPair(obj)
	if !isLst {
		return obj
	}
	sym, found := sx.GetSymbol(lst.Car())
	if !found {
		env.err = fmt.Errorf("symbol expected, but got %T/%v", lst.Car(), lst.Car())
		return sx.Nil()
	}
	symVal := sym.GetValue()
	fn, found := ev.fns[symVal]
	name := sym.Name()
	fn, found := ev.fns[name]
	if !found {
		env.err = fmt.Errorf("symbol %q not bound", sym)
		env.err = fmt.Errorf("symbol %q not bound", name)
		return sx.Nil()
	}
	var args sx.Vector
	var args []sx.Object
	for cdr := lst.Cdr(); !sx.IsNil(cdr); {
		pair, isPair := sx.GetPair(cdr)
		if !isPair {
			break
		}
		args = append(args, pair.Car())
		cdr = pair.Cdr()
	}
	if minArgs, hasMinArgs := ev.minArgs[symVal]; hasMinArgs {
	if minArgs, hasMinArgs := ev.minArgs[name]; hasMinArgs {
		if minArgs > len(args) {
			env.err = fmt.Errorf("%v needs at least %d arguments, but got only %d", sym, minArgs, len(args))
			env.err = fmt.Errorf("%v needs at least %d arguments, but got only %d", name, minArgs, len(args))
			return sx.Nil()
		}
	}
	result := fn(args, env)
	if env.err != nil {
		return sx.Nil()
	}
	return result
}

func (ev *Evaluator) evalSlice(args sx.Vector, env *Environment) *sx.Pair {
	var result sx.ListBuilder
func (ev *Evaluator) evalSlice(args []sx.Object, env *Environment) *sx.Pair {
	result := sx.Cons(sx.Nil(), sx.Nil())
	curr := result
	for _, arg := range args {
		elem := ev.Eval(arg, env)
		elem := ev.eval(arg, env)
		result.Add(elem)
	}
	if env.err == nil {
		if env.err != nil {
		return result.List()
	}
	return nil
}

			return nil
		}
		curr = curr.AppendBang(elem)
// EvaluatePairList evaluates a list of lists.
func (ev *Evaluator) EvalPairList(pair *sx.Pair, env *Environment) *sx.Pair {
	var result sx.ListBuilder
	for node := pair; node != nil; node = node.Tail() {
		elem := ev.Eval(node.Car(), env)
		result.Add(elem)
	}
	if env.err == nil {
		return result.List()
	}
	return result.Tail()
}
	return nil
}


func (ev *Evaluator) evalLink(a attrs.Attributes, refValue sx.String, inline sx.Vector, env *Environment) sx.Object {
func (ev *Evaluator) evalLink(a attrs.Attributes, refValue sx.String, inline []sx.Object, env *Environment) sx.Object {
	result := ev.evalSlice(inline, env)
	if len(inline) == 0 {
		result = sx.Nil().Cons(refValue)
	}
	if ev.noLinks {
		return result.Cons(SymSPAN)
		return result.Cons(ev.symSpan)
	}
	return result.Cons(ev.EvaluateAttrbute(a)).Cons(SymA)
	return result.Cons(ev.EvaluateAttrbute(a)).Cons(ev.symA)
}

func (ev *Evaluator) getSymbol(obj sx.Object, env *Environment) *sx.Symbol {
func (ev *Evaluator) getSymbol(val sx.Object, env *Environment) *sx.Symbol {
	if env.err == nil {
		if sym, ok := sx.GetSymbol(obj); ok {
		if sym, ok := sx.GetSymbol(val); ok {
			return sym
		}
		env.err = fmt.Errorf("%v/%T is not a symbol", obj, obj)
		env.err = fmt.Errorf("%v/%T is not a symbol", val, val)
	}
	return sx.MakeSymbol("???")
	return ev.Make("???")
}
func getString(val sx.Object, env *Environment) sx.String {
	if env.err != nil {
		return ""
	}
	if s, ok := sx.GetString(val); ok {
		return s

	}
	if num, ok := sx.GetNumber(val); ok {
		return int64(num.(sx.Int64))
	}
	env.err = fmt.Errorf("%v/%T is not a number", val, val)
	return -1017
}

// GetAttributes evaluates the given arg in the given environment and returns
// the contained attributes.
func (ev *Evaluator) GetAttributes(arg sx.Object, env *Environment) attrs.Attributes {
	return sz.GetAttributes(getList(arg, env))
func (ev *Evaluator) getAttributes(arg sx.Object, env *Environment) attrs.Attributes {
	return sz.GetAttributes(getList(ev.eval(arg, env), env))
}

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

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

package sz

import "zettelstore.de/sx.fossil"

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

const (
	// Symbols for Metanodes
	NameBlock  = "BLOCK"
	NameInline = "INLINE"
	NameMeta   = "META"
	NameSymBlock  = "BLOCK"
	NameSymInline = "INLINE"
	NameSymMeta   = "META"

	// Symbols for Zettel noMakede types.
	NameBLOB            = "BLOB"
	NameCell            = "CELL"
	NameCellCenter      = "CELL-CENTER"
	NameCellLeft        = "CELL-LEFT"
	NameCellRight       = "CELL-RIGHT"
	NameCite            = "CITE"
	NameDescription     = "DESCRIPTION"
	NameEmbed           = "EMBED"
	NameEmbedBLOB       = "EMBED-BLOB"
	NameEndnote         = "ENDNOTE"
	NameFormatEmph      = "FORMAT-EMPH"
	NameFormatDelete    = "FORMAT-DELETE"
	NameFormatInsert    = "FORMAT-INSERT"
	NameFormatMark      = "FORMAT-MARK"
	NameFormatQuote     = "FORMAT-QUOTE"
	NameFormatSpan      = "FORMAT-SPAN"
	NameFormatSub       = "FORMAT-SUB"
	NameFormatSuper     = "FORMAT-SUPER"
	NameFormatStrong    = "FORMAT-STRONG"
	NameHard            = "HARD"
	NameHeading         = "HEADING"
	NameLinkInvalid     = "LINK-INVALID"
	NameLinkZettel      = "LINK-ZETTEL"
	NameLinkSelf        = "LINK-SELF"
	NameLinkFound       = "LINK-FOUND"
	NameLinkBroken      = "LINK-BROKEN"
	NameLinkHosted      = "LINK-HOSTED"
	NameLinkBased       = "LINK-BASED"
	NameLinkQuery       = "LINK-QUERY"
	NameLinkExternal    = "LINK-EXTERNAL"
	NameListOrdered     = "ORDERED"
	NameListUnordered   = "UNORDERED"
	NameListQuote       = "QUOTATION"
	NameLiteralProg     = "LITERAL-CODE"
	NameLiteralComment  = "LITERAL-COMMENT"
	NameLiteralHTML     = "LITERAL-HTML"
	NameLiteralInput    = "LITERAL-INPUT"
	NameLiteralMath     = "LITERAL-MATH"
	NameLiteralOutput   = "LITERAL-OUTPUT"
	NameLiteralZettel   = "LITERAL-ZETTEL"
	NameMark            = "MARK"
	NamePara            = "PARA"
	NameRegionBlock     = "REGION-BLOCK"
	NameRegionQuote     = "REGION-QUOTE"
	NameRegionVerse     = "REGION-VERSE"
	NameSoft            = "SOFT"
	NameSpace           = "SPACE"
	NameTable           = "TABLE"
	NameText            = "TEXT"
	NameThematic        = "THEMATIC"
	NameTransclude      = "TRANSCLUDE"
	NameUnknown         = "UNKNOWN-NODE"
	NameVerbatimComment = "VERBATIM-COMMENT"
	NameVerbatimEval    = "VERBATIM-EVAL"
	NameVerbatimHTML    = "VERBATIM-HTML"
	NameVerbatimMath    = "VERBATIM-MATH"
	NameVerbatimProg    = "VERBATIM-CODE"
	NameVerbatimZettel  = "VERBATIM-ZETTEL"
	// Symbols for Zettel node types.
	NameSymBLOB            = "BLOB"
	NameSymCell            = "CELL"
	NameSymCellCenter      = "CELL-CENTER"
	NameSymCellLeft        = "CELL-LEFT"
	NameSymCellRight       = "CELL-RIGHT"
	NameSymCite            = "CITE"
	NameSymDescription     = "DESCRIPTION"
	NameSymEmbed           = "EMBED"
	NameSymEmbedBLOB       = "EMBED-BLOB"
	NameSymEndnote         = "ENDNOTE"
	NameSymFormatEmph      = "FORMAT-EMPH"
	NameSymFormatDelete    = "FORMAT-DELETE"
	NameSymFormatInsert    = "FORMAT-INSERT"
	NameSymFormatMark      = "FORMAT-MARK"
	NameSymFormatQuote     = "FORMAT-QUOTE"
	NameSymFormatSpan      = "FORMAT-SPAN"
	NameSymFormatSub       = "FORMAT-SUB"
	NameSymFormatSuper     = "FORMAT-SUPER"
	NameSymFormatStrong    = "FORMAT-STRONG"
	NameSymHard            = "HARD"
	NameSymHeading         = "HEADING"
	NameSymLinkInvalid     = "LINK-INVALID"
	NameSymLinkZettel      = "LINK-ZETTEL"
	NameSymLinkSelf        = "LINK-SELF"
	NameSymLinkFound       = "LINK-FOUND"
	NameSymLinkBroken      = "LINK-BROKEN"
	NameSymLinkHosted      = "LINK-HOSTED"
	NameSymLinkBased       = "LINK-BASED"
	NameSymLinkQuery       = "LINK-QUERY"
	NameSymLinkExternal    = "LINK-EXTERNAL"
	NameSymListOrdered     = "ORDERED"
	NameSymListUnordered   = "UNORDERED"
	NameSymListQuote       = "QUOTATION"
	NameSymLiteralProg     = "LITERAL-CODE"
	NameSymLiteralComment  = "LITERAL-COMMENT"
	NameSymLiteralHTML     = "LITERAL-HTML"
	NameSymLiteralInput    = "LITERAL-INPUT"
	NameSymLiteralMath     = "LITERAL-MATH"
	NameSymLiteralOutput   = "LITERAL-OUTPUT"
	NameSymLiteralZettel   = "LITERAL-ZETTEL"
	NameSymMark            = "MARK"
	NameSymPara            = "PARA"
	NameSymRegionBlock     = "REGION-BLOCK"
	NameSymRegionQuote     = "REGION-QUOTE"
	NameSymRegionVerse     = "REGION-VERSE"
	NameSymSoft            = "SOFT"
	NameSymSpace           = "SPACE"
	NameSymTable           = "TABLE"
	NameSymText            = "TEXT"
	NameSymThematic        = "THEMATIC"
	NameSymTransclude      = "TRANSCLUDE"
	NameSymUnknown         = "UNKNOWN-NODE"
	NameSymVerbatimComment = "VERBATIM-COMMENT"
	NameSymVerbatimEval    = "VERBATIM-EVAL"
	NameSymVerbatimHTML    = "VERBATIM-HTML"
	NameSymVerbatimMath    = "VERBATIM-MATH"
	NameSymVerbatimProg    = "VERBATIM-CODE"
	NameSymVerbatimZettel  = "VERBATIM-ZETTEL"

	// Constant symbols for reference states.
	NameRefStateInvalid  = "INVALID"
	NameRefStateZettel   = "ZETTEL"
	NameRefStateSelf     = "SELF"
	NameRefStateFound    = "FOUND"
	NameRefStateBroken   = "BROKEN"
	NameRefStateHosted   = "HOSTED"
	NameRefStateBased    = "BASED"
	NameRefStateQuery    = "QUERY"
	NameRefStateExternal = "EXTERNAL"
	NameSymRefStateInvalid  = "INVALID"
	NameSymRefStateZettel   = "ZETTEL"
	NameSymRefStateSelf     = "SELF"
	NameSymRefStateFound    = "FOUND"
	NameSymRefStateBroken   = "BROKEN"
	NameSymRefStateHosted   = "HOSTED"
	NameSymRefStateBased    = "BASED"
	NameSymRefStateQuery    = "QUERY"
	NameSymRefStateExternal = "EXTERNAL"

	// Symbols for metadata types.
	NameTypeCredential   = "CREDENTIAL"
	NameTypeEmpty        = "EMPTY-STRING"
	NameTypeID           = "ZID"
	NameTypeIDSet        = "ZID-SET"
	NameTypeNumber       = "NUMBER"
	NameTypeString       = "STRING"
	NameTypeTagSet       = "TAG-SET"
	NameTypeTimestamp    = "TIMESTAMP"
	NameTypeURL          = "URL"
	NameTypeWord         = "WORD"
	NameTypeZettelmarkup = "ZETTELMARKUP"
	NameSymTypeCredential   = "CREDENTIAL"
	NameSymTypeEmpty        = "EMPTY-STRING"
	NameSymTypeID           = "ZID"
	NameSymTypeIDSet        = "ZID-SET"
	NameSymTypeNumber       = "NUMBER"
	NameSymTypeString       = "STRING"
	NameSymTypeTagSet       = "TAG-SET"
	NameSymTypeTimestamp    = "TIMESTAMP"
	NameSymTypeURL          = "URL"
	NameSymTypeWord         = "WORD"
	NameSymTypeWordSet      = "WORD-SET"
	NameSymTypeZettelmarkup = "ZETTELMARKUP"
)

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

	// Symbols for Zettel node types.
	SymBLOB            *sx.Symbol
	SymCell            *sx.Symbol
	SymCellCenter      *sx.Symbol
	SymCellLeft        *sx.Symbol
	SymCellRight       *sx.Symbol
	SymCite            *sx.Symbol
	SymDescription     *sx.Symbol
	SymEmbed           *sx.Symbol
	SymEmbedBLOB       *sx.Symbol
	SymEndnote         *sx.Symbol
	SymFormatEmph      *sx.Symbol
	SymFormatDelete    *sx.Symbol
	SymFormatInsert    *sx.Symbol
	SymFormatMark      *sx.Symbol
	SymFormatQuote     *sx.Symbol
	SymFormatSpan      *sx.Symbol
	SymFormatSub       *sx.Symbol
	SymFormatSuper     *sx.Symbol
	SymFormatStrong    *sx.Symbol
	SymHard            *sx.Symbol
	SymHeading         *sx.Symbol
	SymLinkInvalid     *sx.Symbol
	SymLinkZettel      *sx.Symbol
)

	SymLinkSelf        *sx.Symbol
	SymLinkFound       *sx.Symbol
	SymLinkBroken      *sx.Symbol
	SymLinkHosted      *sx.Symbol
	SymLinkBased       *sx.Symbol
	SymLinkQuery       *sx.Symbol
	SymLinkExternal    *sx.Symbol
	SymListOrdered     *sx.Symbol
	SymListUnordered   *sx.Symbol
	SymListQuote       *sx.Symbol
	SymLiteralProg     *sx.Symbol
	SymLiteralComment  *sx.Symbol
	SymLiteralHTML     *sx.Symbol
	SymLiteralInput    *sx.Symbol
	SymLiteralMath     *sx.Symbol
	SymLiteralOutput   *sx.Symbol
	SymLiteralZettel   *sx.Symbol
	SymMark            *sx.Symbol
var (
	// Symbols for Metanodes
	SymBlock  = sx.MakeSymbol(NameBlock)
	SymInline = sx.MakeSymbol(NameInline)
	SymMeta   = sx.MakeSymbol(NameMeta)

	SymPara            *sx.Symbol
	SymRegionBlock     *sx.Symbol
	SymRegionQuote     *sx.Symbol
	SymRegionVerse     *sx.Symbol
	SymSoft            *sx.Symbol
	// Symbols for Zettel noMakede types.
	SymBLOB            = sx.MakeSymbol(NameBLOB)
	SymCell            = sx.MakeSymbol(NameCell)
	SymCellCenter      = sx.MakeSymbol(NameCellCenter)
	SymCellLeft        = sx.MakeSymbol(NameCellLeft)
	SymCellRight       = sx.MakeSymbol(NameCellRight)
	SymCite            = sx.MakeSymbol(NameCite)
	SymDescription     = sx.MakeSymbol(NameDescription)
	SymEmbed           = sx.MakeSymbol(NameEmbed)
	SymEmbedBLOB       = sx.MakeSymbol(NameEmbedBLOB)
	SymEndnote         = sx.MakeSymbol(NameEndnote)
	SymFormatEmph      = sx.MakeSymbol(NameFormatEmph)
	SymFormatDelete    = sx.MakeSymbol(NameFormatDelete)
	SymFormatInsert    = sx.MakeSymbol(NameFormatInsert)
	SymFormatMark      = sx.MakeSymbol(NameFormatMark)
	SymFormatQuote     = sx.MakeSymbol(NameFormatQuote)
	SymFormatSpan      = sx.MakeSymbol(NameFormatSpan)
	SymFormatSub       = sx.MakeSymbol(NameFormatSub)
	SymFormatSuper     = sx.MakeSymbol(NameFormatSuper)
	SymFormatStrong    = sx.MakeSymbol(NameFormatStrong)
	SymHard            = sx.MakeSymbol(NameHard)
	SymHeading         = sx.MakeSymbol(NameHeading)
	SymLinkInvalid     = sx.MakeSymbol(NameLinkInvalid)
	SymLinkZettel      = sx.MakeSymbol(NameLinkZettel)
	SymLinkSelf        = sx.MakeSymbol(NameLinkSelf)
	SymLinkFound       = sx.MakeSymbol(NameLinkFound)
	SymLinkBroken      = sx.MakeSymbol(NameLinkBroken)
	SymLinkHosted      = sx.MakeSymbol(NameLinkHosted)
	SymLinkBased       = sx.MakeSymbol(NameLinkBased)
	SymLinkQuery       = sx.MakeSymbol(NameLinkQuery)
	SymLinkExternal    = sx.MakeSymbol(NameLinkExternal)
	SymListOrdered     = sx.MakeSymbol(NameListOrdered)
	SymListUnordered   = sx.MakeSymbol(NameListUnordered)
	SymListQuote       = sx.MakeSymbol(NameListQuote)
	SymLiteralProg     = sx.MakeSymbol(NameLiteralProg)
	SymLiteralComment  = sx.MakeSymbol(NameLiteralComment)
	SymLiteralHTML     = sx.MakeSymbol(NameLiteralHTML)
	SymLiteralInput    = sx.MakeSymbol(NameLiteralInput)
	SymLiteralMath     = sx.MakeSymbol(NameLiteralMath)
	SymLiteralOutput   = sx.MakeSymbol(NameLiteralOutput)
	SymLiteralZettel   = sx.MakeSymbol(NameLiteralZettel)
	SymMark            = sx.MakeSymbol(NameMark)
	SymPara            = sx.MakeSymbol(NamePara)
	SymRegionBlock     = sx.MakeSymbol(NameRegionBlock)
	SymRegionQuote     = sx.MakeSymbol(NameRegionQuote)
	SymRegionVerse     = sx.MakeSymbol(NameRegionVerse)
	SymSoft            = sx.MakeSymbol(NameSoft)
	SymSpace           = sx.MakeSymbol(NameSpace)
	SymTable           = sx.MakeSymbol(NameTable)
	SymText            = sx.MakeSymbol(NameText)
	SymSpace           *sx.Symbol
	SymTable           *sx.Symbol
	SymText            *sx.Symbol
	SymThematic        *sx.Symbol
	SymTransclude      *sx.Symbol
	SymUnknown         *sx.Symbol
	SymVerbatimComment *sx.Symbol
	SymVerbatimEval    *sx.Symbol
	SymVerbatimHTML    *sx.Symbol
	SymVerbatimMath    *sx.Symbol
	SymVerbatimProg    *sx.Symbol
	SymVerbatimZettel  *sx.Symbol

	// Constant symbols for reference states.

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

	// Symbols for metadata types

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

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

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

	// Constant symbols for reference states.
	SymRefStateInvalid  = sx.MakeSymbol(NameRefStateInvalid)
	SymRefStateZettel   = sx.MakeSymbol(NameRefStateZettel)
	SymRefStateSelf     = sx.MakeSymbol(NameRefStateSelf)
	SymRefStateFound    = sx.MakeSymbol(NameRefStateFound)
	SymRefStateBroken   = sx.MakeSymbol(NameRefStateBroken)
	SymRefStateHosted   = sx.MakeSymbol(NameRefStateHosted)
	SymRefStateBased    = sx.MakeSymbol(NameRefStateBased)
	SymRefStateQuery    = sx.MakeSymbol(NameRefStateQuery)
	SymRefStateExternal = sx.MakeSymbol(NameRefStateExternal)
	zs.SymRefStateInvalid = sf.MustMake(NameSymRefStateInvalid)
	zs.SymRefStateZettel = sf.MustMake(NameSymRefStateZettel)
	zs.SymRefStateSelf = sf.MustMake(NameSymRefStateSelf)
	zs.SymRefStateFound = sf.MustMake(NameSymRefStateFound)
	zs.SymRefStateBroken = sf.MustMake(NameSymRefStateBroken)
	zs.SymRefStateHosted = sf.MustMake(NameSymRefStateHosted)
	zs.SymRefStateBased = sf.MustMake(NameSymRefStateBased)
	zs.SymRefStateQuery = sf.MustMake(NameSymRefStateQuery)
	zs.SymRefStateExternal = sf.MustMake(NameSymRefStateExternal)

	// Symbols for metadata types.
	SymTypeCredential   = sx.MakeSymbol(NameTypeCredential)
	SymTypeEmpty        = sx.MakeSymbol(NameTypeEmpty)
	SymTypeID           = sx.MakeSymbol(NameTypeID)
	SymTypeIDSet        = sx.MakeSymbol(NameTypeIDSet)
	SymTypeNumber       = sx.MakeSymbol(NameTypeNumber)
	SymTypeString       = sx.MakeSymbol(NameTypeString)
	SymTypeTagSet       = sx.MakeSymbol(NameTypeTagSet)
	SymTypeTimestamp    = sx.MakeSymbol(NameTypeTimestamp)
	SymTypeURL          = sx.MakeSymbol(NameTypeURL)
	SymTypeWord         = sx.MakeSymbol(NameTypeWord)
	SymTypeZettelmarkup = sx.MakeSymbol(NameTypeZettelmarkup)
	zs.SymTypeCredential = sf.MustMake(NameSymTypeCredential)
	zs.SymTypeEmpty = sf.MustMake(NameSymTypeEmpty)
	zs.SymTypeID = sf.MustMake(NameSymTypeID)
	zs.SymTypeIDSet = sf.MustMake(NameSymTypeIDSet)
	zs.SymTypeNumber = sf.MustMake(NameSymTypeNumber)
	zs.SymTypeString = sf.MustMake(NameSymTypeString)
	zs.SymTypeTagSet = sf.MustMake(NameSymTypeTagSet)
	zs.SymTypeTimestamp = sf.MustMake(NameSymTypeTimestamp)
	zs.SymTypeURL = sf.MustMake(NameSymTypeURL)
	zs.SymTypeWord = sf.MustMake(NameSymTypeWord)
	zs.SymTypeWordSet = sf.MustMake(NameSymTypeWordSet)
	zs.SymTypeZettelmarkup = sf.MustMake(NameSymTypeZettelmarkup)
)
}

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

package sz_test

import (
	"strconv"
	"testing"

	"zettelstore.de/client.fossil/sz"
	"zettelstore.de/sx.fossil"
)

func BenchmarkInitZttlSyms(b *testing.B) {
	for j := 0; j < 20; j++ {
		b.Run("hint-"+strconv.Itoa(j), func(b *testing.B) {
			sf := sx.MakeMappedFactory(1 << j)
			for i := 0; i < b.N; i++ {
				var zs sz.ZettelSymbols
				zs.InitializeZettelSymbols(sf)
			}
		})
	}
}

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

package sz

import (
	"zettelstore.de/client.fossil/attrs"
	"zettelstore.de/sx.fossil"

		val := pair.Cdr()
		if tail, isTailPair := sx.GetPair(val); isTailPair {
			val = tail.Car()
		}
		if !val.IsAtom() {
			continue
		}
		result = result.Set(GoValue(key), GoValue(val))
		result = result.Set(key.String(), val.String())
	}
	return result
}

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

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

func MakeMeta(obj sx.Object) Meta {
	if result := doMakeMeta(obj); len(result) > 0 {
		return result
	}
	return nil
}
func doMakeMeta(obj sx.Object) Meta {
	result := make(map[string]MetaValue)
	for {
		if sx.IsNil(obj) {
			return result
		}
	lst, isList := sx.GetPair(obj)
	if !isList || !lst.Car().IsEqual(SymMeta) {
		return nil
	}
		pair, isPair := sx.GetPair(obj)
		if !isPair {
			return result
		}
	result := make(map[string]MetaValue)
	for node := lst.Tail(); node != nil; node = node.Tail() {
		if mv, found := makeMetaValue(node.Head()); found {
		if mv, ok2 := makeMetaValue(pair); ok2 {
			result[mv.Key] = mv
		}
		obj = pair.Cdr()
	}
	return result
}
func makeMetaValue(mnode *sx.Pair) (MetaValue, bool) {
	var result MetaValue
	mval, isPair := sx.GetPair(mnode.Car())
	if !isPair {
		return result, false
	}
	typeSym, isSymbol := sx.GetSymbol(mnode.Car())
	typeSym, isSymbol := sx.GetSymbol(mval.Car())
	if !isSymbol {
		return result, false
	}
	next := mnode.Tail()
	keySym, isSymbol := sx.GetSymbol(next.Car())
	keyPair, isPair := sx.GetPair(mval.Cdr())
	if !isPair {
		return result, false
	}
	keyList, isPair := sx.GetPair(keyPair.Car())
	if !isPair {
		return result, false
	}
	quoteSym, isSymbol := sx.GetSymbol(keyList.Car())
	if !isSymbol || quoteSym.Name() != "quote" {
		return result, false
	}
	keySym, isSymbol := sx.GetSymbol(keyList.Tail().Car())
	if !isSymbol {
		return result, false
	}
	valPair, isPair := sx.GetPair(keyPair.Cdr())
	next = next.Tail()
	result.Type = typeSym.GetValue()
	result.Key = keySym.GetValue()
	result.Value = next.Car()
	if !isPair {
		return result, false
	}
	result.Type = typeSym.Name()
	result.Key = keySym.Name()
	result.Value = valPair.Car()
	return result, true
}

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

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

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

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

import (
	"strings"

	"zettelstore.de/client.fossil/sz"
	"zettelstore.de/sx.fossil"
)

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

func NewEncoder() *Encoder {

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

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

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

// EvaluateInlineString returns the text content of the given inline list as a string.
func EvaluateInlineString(lst *sx.Pair) string {
	if sf := sx.FindSymbolFactory(lst); sf != nil {
	return NewEncoder().Encode(lst)
		return NewEncoder(sf).Encode(lst)
	}
	return ""
}

func (enc *Encoder) executeList(lst *sx.Pair) {
	for elem := lst; elem != nil; elem = elem.Tail() {
		enc.execute(elem.Car())
	}
}
func (enc *Encoder) execute(obj sx.Object) {
	cmd, isPair := sx.GetPair(obj)
	if !isPair {
		return
	}
	sym := cmd.Car()
	if sx.IsNil(sym) {
		return
	}
	if sym.IsEqual(sz.SymText) {
	if sym.IsEqual(enc.symText) {
		args := cmd.Tail()
		if args == nil {
			return
		}
		if val, isString := sx.GetString(args.Car()); isString {
			enc.sb.WriteString(string(val))
			enc.sb.WriteString(val.String())
		}
	} else if sym.IsEqual(sz.SymSpace) || sym.IsEqual(sz.SymSoft) {
	} else if sym.IsEqual(enc.symSpace) || sym.IsEqual(enc.symSoft) {
		enc.sb.WriteByte(' ')
	} else if sym.IsEqual(sz.SymHard) {
	} else if sym.IsEqual(enc.symHard) {
		enc.sb.WriteByte('\n')
	} else if !sym.IsEqual(sx.SymbolQuote) {
	} else if !sym.IsEqual(enc.symQuote) {
		enc.executeList(cmd.Tail())
	}
}

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

package text_test

import (
	"strings"
	"testing"

<title>Change Log</title>

<a name="0_18"></a>
<h2>Changes for Version 0.18.0 (pending)</h2>

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

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

<title>Home</title>

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

<h3>Latest Release: 0.17.0 (2024-03-04)</h3>
  *  [./changes.wiki#0_17|Change summary]
  *  [/timeline?p=v0.17.0&bt=v0.16.0&y=ci|Check-ins for version 0.17.0],
     [/vdiff?to=v0.17.0&from=v0.16.0|content diff]
  *  [/timeline?df=v0.17.0&y=ci|Check-ins derived from the 0.17.0 release],
     [/vdiff?from=v0.17.0&to=trunk|content diff]
<h3>Latest Release: 0.16.0 (2023-11-30)</h3>
  *  [./changes.wiki#0_16|Change summary]
  *  [/timeline?p=v0.16.0&bt=v0.15.0&y=ci|Check-ins for version 0.16.0],
     [/vdiff?to=v0.16.0&from=v0.15.0|content diff]
  *  [/timeline?df=v0.16.0&y=ci|Check-ins derived from the 0.16.0 release],
     [/vdiff?from=v0.16.0&to=trunk|content diff]
  *  [/timeline?t=release|Timeline of all past releases]

<h3>Use instructions</h3>

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