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// Copyright 2015 The Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package markdown
func ruleStrikeThrough(s *StateInline, silent bool) bool {
src := s.Src
start := s.Pos
marker := src[start]
if silent {
return false
}
if src[start] != '~' {
return false
}
canOpen, canClose, length := s.scanDelims(start, true)
origLength := length
ch := string(marker)
if length < 2 {
return false
}
if length%2 != 0 {
s.PushToken(&Text{
Content: ch,
})
length--
}
for i := 0; i < length; i += 2 {
s.PushToken(&Text{
Content: ch + ch,
})
s.Delimiters = append(s.Delimiters, Delimiter{
Marker: marker,
Length: -1,
Jump: i,
Token: len(s.Tokens) - 1,
Level: s.Level,
End: -1,
Open: canOpen,
Close: canClose,
})
}
s.Pos += origLength
return true
}
func ruleStrikethroughPostprocess(s *StateInline) {
var loneMarkers []int
delimiters := s.Delimiters
max := len(delimiters)
for i := 0; i < max; i++ {
startDelim := delimiters[i]
if startDelim.Marker != '~' {
continue
}
if startDelim.End == -1 {
continue
}
endDelim := delimiters[startDelim.End]
s.Tokens[startDelim.Token] = &StrikethroughOpen{}
s.Tokens[endDelim.Token] = &StrikethroughClose{}
if text, ok := s.Tokens[endDelim.Token-1].(*Text); ok && text.Content == "~" {
loneMarkers = append(loneMarkers, endDelim.Token-1)
}
}
for len(loneMarkers) > 0 {
i := loneMarkers[len(loneMarkers)-1]
loneMarkers = loneMarkers[:len(loneMarkers)-1]
j := i + 1
for j < len(s.Tokens) {
if _, ok := s.Tokens[j].(*StrikethroughClose); !ok {
break
}
j++
}
j--
if i != j {
s.Tokens[i], s.Tokens[j] = s.Tokens[j], s.Tokens[i]
}
}
}
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