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90 lines
1.8 KiB
Go
90 lines
1.8 KiB
Go
// Copyright 2015 The Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package markdown
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type Delimiter struct {
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Length int
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Jump int
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Token int
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Level int
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End int
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Open bool
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Close bool
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Marker byte
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}
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func ruleEmphasis(s *StateInline, silent bool) bool {
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src := s.Src
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start := s.Pos
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marker := src[start]
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if silent {
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return false
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}
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if marker != '_' && marker != '*' {
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return false
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}
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canOpen, canClose, length := s.scanDelims(s.Pos, marker == '*')
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for i := 0; i < length; i++ {
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s.PushToken(&Text{Content: string(marker)})
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s.Delimiters = append(s.Delimiters, Delimiter{
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Marker: marker,
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Length: length,
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Jump: i,
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Token: len(s.Tokens) - 1,
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Level: s.Level,
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End: -1,
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Open: canOpen,
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Close: canClose,
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})
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}
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s.Pos += length
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return true
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}
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func ruleEmphasisPostprocess(s *StateInline) {
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delimiters := s.Delimiters
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max := len(delimiters)
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for i := max - 1; i >= 0; i-- {
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startDelim := delimiters[i]
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if startDelim.Marker != '_' && startDelim.Marker != '*' {
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continue
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}
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if startDelim.End == -1 {
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continue
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}
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endDelim := delimiters[startDelim.End]
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isStrong := i > 0 &&
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delimiters[i-1].End == startDelim.End+1 &&
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delimiters[i-1].Token == startDelim.Token-1 &&
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delimiters[startDelim.End+1].Token == endDelim.Token+1 &&
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delimiters[i-1].Marker == startDelim.Marker
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if isStrong {
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s.Tokens[startDelim.Token] = &StrongOpen{}
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s.Tokens[endDelim.Token] = &StrongClose{}
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if text, ok := s.Tokens[delimiters[i-1].Token].(*Text); ok {
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text.Content = ""
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}
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if text, ok := s.Tokens[delimiters[startDelim.End+1].Token].(*Text); ok {
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text.Content = ""
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}
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i--
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} else {
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s.Tokens[startDelim.Token] = &EmphasisOpen{}
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s.Tokens[endDelim.Token] = &EmphasisClose{}
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}
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}
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}
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