358 lines
11 KiB
Go
358 lines
11 KiB
Go
package org
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import (
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"fmt"
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"path"
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"regexp"
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"strings"
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"time"
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"unicode"
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)
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type Text struct {
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Content string
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IsRaw bool
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}
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type LineBreak struct{ Count int }
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type ExplicitLineBreak struct{}
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type StatisticToken struct{ Content string }
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type Timestamp struct {
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Time time.Time
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IsDate bool
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Interval string
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}
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type Emphasis struct {
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Kind string
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Content []Node
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}
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type LatexFragment struct {
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OpeningPair string
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ClosingPair string
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Content []Node
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}
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type FootnoteLink struct {
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Name string
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Definition *FootnoteDefinition
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}
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type RegularLink struct {
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Protocol string
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Description []Node
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URL string
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AutoLink bool
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}
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var validURLCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~:/?#[]@!$&'()*+,;="
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var autolinkProtocols = regexp.MustCompile(`^(https?|ftp|file)$`)
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var imageExtensionRegexp = regexp.MustCompile(`^[.](png|gif|jpe?g|svg|tiff?)$`)
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var videoExtensionRegexp = regexp.MustCompile(`^[.](webm|mp4)$`)
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var subScriptSuperScriptRegexp = regexp.MustCompile(`^([_^]){([^{}]+?)}`)
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var timestampRegexp = regexp.MustCompile(`^<(\d{4}-\d{2}-\d{2})( [A-Za-z]+)?( \d{2}:\d{2})?( \+\d+[dwmy])?>`)
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var footnoteRegexp = regexp.MustCompile(`^\[fn:([\w-]*?)(:(.*?))?\]`)
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var statisticsTokenRegexp = regexp.MustCompile(`^\[(\d+/\d+|\d+%)\]`)
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var latexFragmentRegexp = regexp.MustCompile(`(?s)^\\begin{(\w+)}(.*)\\end{(\w+)}`)
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var timestampFormat = "2006-01-02 Mon 15:04"
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var datestampFormat = "2006-01-02 Mon"
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var latexFragmentPairs = map[string]string{
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`\(`: `\)`,
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`\[`: `\]`,
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`$$`: `$$`,
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}
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func (d *Document) parseInline(input string) (nodes []Node) {
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previous, current := 0, 0
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for current < len(input) {
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rewind, consumed, node := 0, 0, (Node)(nil)
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switch input[current] {
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case '^':
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consumed, node = d.parseSubOrSuperScript(input, current)
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case '_':
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consumed, node = d.parseSubScriptOrEmphasis(input, current)
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case '*', '/', '+':
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consumed, node = d.parseEmphasis(input, current, false)
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case '=', '~':
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consumed, node = d.parseEmphasis(input, current, true)
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case '[':
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consumed, node = d.parseOpeningBracket(input, current)
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case '<':
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consumed, node = d.parseTimestamp(input, current)
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case '\\':
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consumed, node = d.parseExplicitLineBreakOrLatexFragment(input, current)
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case '$':
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consumed, node = d.parseLatexFragment(input, current)
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case '\n':
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consumed, node = d.parseLineBreak(input, current)
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case ':':
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rewind, consumed, node = d.parseAutoLink(input, current)
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current -= rewind
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}
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if consumed != 0 {
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if current > previous {
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nodes = append(nodes, Text{input[previous:current], false})
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}
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if node != nil {
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nodes = append(nodes, node)
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}
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current += consumed
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previous = current
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} else {
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current++
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}
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}
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if previous < len(input) {
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nodes = append(nodes, Text{input[previous:], false})
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}
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return nodes
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}
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func (d *Document) parseRawInline(input string) (nodes []Node) {
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previous, current := 0, 0
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for current < len(input) {
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if input[current] == '\n' {
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consumed, node := d.parseLineBreak(input, current)
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if current > previous {
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nodes = append(nodes, Text{input[previous:current], true})
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}
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nodes = append(nodes, node)
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current += consumed
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previous = current
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} else {
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current++
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}
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}
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if previous < len(input) {
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nodes = append(nodes, Text{input[previous:], true})
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}
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return nodes
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}
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func (d *Document) parseLineBreak(input string, start int) (int, Node) {
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i := start
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for ; i < len(input) && input[i] == '\n'; i++ {
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}
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return i - start, LineBreak{i - start}
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}
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func (d *Document) parseExplicitLineBreakOrLatexFragment(input string, start int) (int, Node) {
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switch {
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case start+2 >= len(input):
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case input[start+1] == '\\' && start != 0 && input[start-1] != '\n':
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for i := start + 2; i <= len(input)-1 && unicode.IsSpace(rune(input[i])); i++ {
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if input[i] == '\n' {
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return i + 1 - start, ExplicitLineBreak{}
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}
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}
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case input[start+1] == '(' || input[start+1] == '[':
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return d.parseLatexFragment(input, start)
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case strings.Index(input[start:], `\begin{`) == 0:
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if m := latexFragmentRegexp.FindStringSubmatch(input[start:]); m != nil {
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if open, content, close := m[1], m[2], m[3]; open == close {
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openingPair, closingPair := `\begin{`+open+`}`, `\end{`+close+`}`
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i := strings.Index(input[start:], closingPair)
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return i + len(closingPair), LatexFragment{openingPair, closingPair, d.parseRawInline(content)}
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}
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}
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}
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return 0, nil
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}
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func (d *Document) parseLatexFragment(input string, start int) (int, Node) {
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if start+2 >= len(input) {
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return 0, nil
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}
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openingPair := input[start : start+2]
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closingPair := latexFragmentPairs[openingPair]
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if i := strings.Index(input[start+2:], closingPair); i != -1 {
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content := d.parseRawInline(input[start+2 : start+2+i])
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return i + 2 + 2, LatexFragment{openingPair, closingPair, content}
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}
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return 0, nil
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}
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func (d *Document) parseSubOrSuperScript(input string, start int) (int, Node) {
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if m := subScriptSuperScriptRegexp.FindStringSubmatch(input[start:]); m != nil {
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return len(m[2]) + 3, Emphasis{m[1] + "{}", []Node{Text{m[2], false}}}
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}
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return 0, nil
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}
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func (d *Document) parseSubScriptOrEmphasis(input string, start int) (int, Node) {
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if consumed, node := d.parseSubOrSuperScript(input, start); consumed != 0 {
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return consumed, node
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}
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return d.parseEmphasis(input, start, false)
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}
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func (d *Document) parseOpeningBracket(input string, start int) (int, Node) {
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if len(input[start:]) >= 2 && input[start] == '[' && input[start+1] == '[' {
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return d.parseRegularLink(input, start)
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} else if footnoteRegexp.MatchString(input[start:]) {
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return d.parseFootnoteReference(input, start)
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} else if statisticsTokenRegexp.MatchString(input[start:]) {
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return d.parseStatisticToken(input, start)
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}
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return 0, nil
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}
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func (d *Document) parseFootnoteReference(input string, start int) (int, Node) {
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if m := footnoteRegexp.FindStringSubmatch(input[start:]); m != nil {
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name, definition := m[1], m[3]
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if name == "" && definition == "" {
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return 0, nil
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}
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link := FootnoteLink{name, nil}
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if definition != "" {
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link.Definition = &FootnoteDefinition{name, []Node{Paragraph{d.parseInline(definition)}}, true}
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}
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return len(m[0]), link
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}
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return 0, nil
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}
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func (d *Document) parseStatisticToken(input string, start int) (int, Node) {
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if m := statisticsTokenRegexp.FindStringSubmatch(input[start:]); m != nil {
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return len(m[1]) + 2, StatisticToken{m[1]}
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}
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return 0, nil
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}
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func (d *Document) parseAutoLink(input string, start int) (int, int, Node) {
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if !d.AutoLink || start == 0 || len(input[start:]) < 3 || input[start:start+3] != "://" {
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return 0, 0, nil
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}
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protocolStart, protocol := start-1, ""
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for ; protocolStart > 0; protocolStart-- {
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if !unicode.IsLetter(rune(input[protocolStart])) {
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protocolStart++
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break
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}
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}
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if m := autolinkProtocols.FindStringSubmatch(input[protocolStart:start]); m != nil {
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protocol = m[1]
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} else {
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return 0, 0, nil
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}
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end := start
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for ; end < len(input) && strings.ContainsRune(validURLCharacters, rune(input[end])); end++ {
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}
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path := input[start:end]
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if path == "://" {
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return 0, 0, nil
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}
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return len(protocol), len(path + protocol), RegularLink{protocol, nil, protocol + path, true}
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}
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func (d *Document) parseRegularLink(input string, start int) (int, Node) {
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input = input[start:]
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if len(input) < 3 || input[:2] != "[[" || input[2] == '[' {
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return 0, nil
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}
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end := strings.Index(input, "]]")
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if end == -1 {
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return 0, nil
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}
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rawLinkParts := strings.Split(input[2:end], "][")
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description, link := ([]Node)(nil), rawLinkParts[0]
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if len(rawLinkParts) == 2 {
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link, description = rawLinkParts[0], d.parseInline(rawLinkParts[1])
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}
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if strings.ContainsRune(link, '\n') {
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return 0, nil
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}
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consumed := end + 2
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protocol, linkParts := "", strings.SplitN(link, ":", 2)
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if len(linkParts) == 2 {
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protocol = linkParts[0]
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}
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return consumed, RegularLink{protocol, description, link, false}
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}
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func (d *Document) parseTimestamp(input string, start int) (int, Node) {
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if m := timestampRegexp.FindStringSubmatch(input[start:]); m != nil {
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ddmmyy, hhmm, interval, isDate := m[1], m[3], strings.TrimSpace(m[4]), false
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if hhmm == "" {
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hhmm, isDate = "00:00", true
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}
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t, err := time.Parse(timestampFormat, fmt.Sprintf("%s Mon %s", ddmmyy, hhmm))
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if err != nil {
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return 0, nil
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}
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timestamp := Timestamp{t, isDate, interval}
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return len(m[0]), timestamp
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}
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return 0, nil
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}
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func (d *Document) parseEmphasis(input string, start int, isRaw bool) (int, Node) {
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marker, i := input[start], start
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if !hasValidPreAndBorderChars(input, i) {
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return 0, nil
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}
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for i, consumedNewLines := i+1, 0; i < len(input) && consumedNewLines <= d.MaxEmphasisNewLines; i++ {
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if input[i] == '\n' {
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consumedNewLines++
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}
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if input[i] == marker && i != start+1 && hasValidPostAndBorderChars(input, i) {
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if isRaw {
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return i + 1 - start, Emphasis{input[start : start+1], d.parseRawInline(input[start+1 : i])}
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}
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return i + 1 - start, Emphasis{input[start : start+1], d.parseInline(input[start+1 : i])}
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}
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}
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return 0, nil
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}
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// see org-emphasis-regexp-components (emacs elisp variable)
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func hasValidPreAndBorderChars(input string, i int) bool {
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return (i+1 >= len(input) || isValidBorderChar(rune(input[i+1]))) && (i == 0 || isValidPreChar(rune(input[i-1])))
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}
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func hasValidPostAndBorderChars(input string, i int) bool {
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return (i == 0 || isValidBorderChar(rune(input[i-1]))) && (i+1 >= len(input) || isValidPostChar(rune(input[i+1])))
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}
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func isValidPreChar(r rune) bool {
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return unicode.IsSpace(r) || strings.ContainsRune(`-({'"`, r)
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}
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func isValidPostChar(r rune) bool {
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return unicode.IsSpace(r) || strings.ContainsRune(`-.,:!?;'")}[`, r)
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}
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func isValidBorderChar(r rune) bool { return !unicode.IsSpace(r) }
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func (l RegularLink) Kind() string {
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if p := l.Protocol; l.Description != nil || (p != "" && p != "file" && p != "http" && p != "https") {
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return "regular"
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}
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if imageExtensionRegexp.MatchString(path.Ext(l.URL)) {
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return "image"
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}
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if videoExtensionRegexp.MatchString(path.Ext(l.URL)) {
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return "video"
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}
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return "regular"
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}
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func (n Text) String() string { return orgWriter.WriteNodesAsString(n) }
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func (n LineBreak) String() string { return orgWriter.WriteNodesAsString(n) }
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func (n ExplicitLineBreak) String() string { return orgWriter.WriteNodesAsString(n) }
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func (n StatisticToken) String() string { return orgWriter.WriteNodesAsString(n) }
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func (n Emphasis) String() string { return orgWriter.WriteNodesAsString(n) }
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func (n LatexFragment) String() string { return orgWriter.WriteNodesAsString(n) }
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func (n FootnoteLink) String() string { return orgWriter.WriteNodesAsString(n) }
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func (n RegularLink) String() string { return orgWriter.WriteNodesAsString(n) }
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func (n Timestamp) String() string { return orgWriter.WriteNodesAsString(n) }
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