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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
import "strings"
var referenceTerminatedBy []BlockRule
func ruleReference(s *StateBlock, startLine, _ int, silent bool) bool {
lines := 0
pos := s.BMarks[startLine] + s.TShift[startLine]
max := s.EMarks[startLine]
nextLine := startLine + 1
if s.SCount[startLine]-s.BlkIndent >= 4 {
return false
}
src := s.Src
if src[pos] != '[' {
return false
}
pos++
for pos < max {
if src[pos] == ']' && src[pos-1] != '\\' {
if pos+1 == max {
return false
}
if src[pos+1] != ':' {
return false
}
break
}
pos++
}
endLine := s.LineMax
oldParentType := s.ParentType
s.ParentType = ptReference
outer:
for ; nextLine < endLine && !s.IsLineEmpty(nextLine); nextLine++ {
if s.SCount[nextLine]-s.BlkIndent > 3 {
continue
}
if s.SCount[nextLine] < 0 {
continue
}
for _, r := range referenceTerminatedBy {
if r(s, nextLine, endLine, true) {
break outer
}
}
}
str := strings.TrimSpace(s.Lines(startLine, nextLine, s.BlkIndent, false))
max = len(str)
var labelEnd int
for pos = 1; pos < max; pos++ {
b := str[pos]
if b == '[' {
return false
} else if b == ']' {
labelEnd = pos
break
} else if b == '\n' {
lines++
} else if b == '\\' {
pos++
if pos < max && str[pos] == '\n' {
lines++
}
}
}
if labelEnd <= 0 || labelEnd+1 >= max || str[labelEnd+1] != ':' {
return false
}
for pos = labelEnd + 2; pos < max; pos++ {
b := str[pos]
if b == '\n' {
lines++
} else if !byteIsSpace(b) {
break
}
}
href, nlines, endpos, ok := parseLinkDestination(str, pos, max)
if !ok {
return false
}
href = normalizeLink(href)
if !validateLink(href) {
return false
}
pos = endpos
lines += nlines
destEndPos := pos
destEndLineNo := lines
start := pos
for ; pos < max; pos++ {
b := str[pos]
if b == '\n' {
lines++
} else if !byteIsSpace(b) {
break
}
}
title, nlines, endpos, ok := parseLinkTitle(str, pos, max)
if pos < max && start != pos && ok {
pos = endpos
lines += nlines
} else {
pos = destEndPos
lines = destEndLineNo
}
for pos < max && byteIsSpace(str[pos]) {
pos++
}
if pos < max && str[pos] != '\n' {
if title != "" {
title = ""
pos = destEndPos
lines = destEndLineNo
for pos < max && byteIsSpace(src[pos]) {
pos++
}
}
}
if pos < max && str[pos] != '\n' {
return false
}
label := normalizeReference(str[1:labelEnd])
if label == "" {
return false
}
if silent {
return true
}
if s.Env.References == nil {
s.Env.References = make(map[string]map[string]string)
}
if _, ok := s.Env.References[label]; !ok {
s.Env.References[label] = map[string]string{
"title": title,
"href": href,
}
}
s.ParentType = oldParentType
s.Line = startLine + lines + 1
return true
}
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