mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-27 13:36:38 +02:00
164 lines
3.5 KiB
Go
164 lines
3.5 KiB
Go
|
package parser
|
||
|
|
||
|
import (
|
||
|
"github.com/yuin/goldmark/ast"
|
||
|
"github.com/yuin/goldmark/text"
|
||
|
"github.com/yuin/goldmark/util"
|
||
|
)
|
||
|
|
||
|
type linkReferenceParagraphTransformer struct {
|
||
|
}
|
||
|
|
||
|
// LinkReferenceParagraphTransformer is a ParagraphTransformer implementation
|
||
|
// that parses and extracts link reference from paragraphs.
|
||
|
var LinkReferenceParagraphTransformer = &linkReferenceParagraphTransformer{}
|
||
|
|
||
|
func (p *linkReferenceParagraphTransformer) Transform(node *ast.Paragraph, reader text.Reader, pc Context) {
|
||
|
lines := node.Lines()
|
||
|
block := text.NewBlockReader(reader.Source(), lines)
|
||
|
removes := [][2]int{}
|
||
|
for {
|
||
|
start, end := parseLinkReferenceDefinition(block, pc)
|
||
|
if start > -1 {
|
||
|
if start == end {
|
||
|
end++
|
||
|
}
|
||
|
removes = append(removes, [2]int{start, end})
|
||
|
continue
|
||
|
}
|
||
|
break
|
||
|
}
|
||
|
|
||
|
offset := 0
|
||
|
for _, remove := range removes {
|
||
|
if lines.Len() == 0 {
|
||
|
break
|
||
|
}
|
||
|
s := lines.Sliced(remove[1]-offset, lines.Len())
|
||
|
lines.SetSliced(0, remove[0]-offset)
|
||
|
lines.AppendAll(s)
|
||
|
offset = remove[1]
|
||
|
}
|
||
|
|
||
|
if lines.Len() == 0 {
|
||
|
t := ast.NewTextBlock()
|
||
|
t.SetBlankPreviousLines(node.HasBlankPreviousLines())
|
||
|
node.Parent().ReplaceChild(node.Parent(), node, t)
|
||
|
return
|
||
|
}
|
||
|
|
||
|
node.SetLines(lines)
|
||
|
}
|
||
|
|
||
|
func parseLinkReferenceDefinition(block text.Reader, pc Context) (int, int) {
|
||
|
block.SkipSpaces()
|
||
|
line, segment := block.PeekLine()
|
||
|
if line == nil {
|
||
|
return -1, -1
|
||
|
}
|
||
|
startLine, _ := block.Position()
|
||
|
width, pos := util.IndentWidth(line, 0)
|
||
|
if width > 3 {
|
||
|
return -1, -1
|
||
|
}
|
||
|
if width != 0 {
|
||
|
pos++
|
||
|
}
|
||
|
if line[pos] != '[' {
|
||
|
return -1, -1
|
||
|
}
|
||
|
open := segment.Start + pos + 1
|
||
|
closes := -1
|
||
|
block.Advance(pos + 1)
|
||
|
for {
|
||
|
line, segment = block.PeekLine()
|
||
|
if line == nil {
|
||
|
return -1, -1
|
||
|
}
|
||
|
closure := util.FindClosure(line, '[', ']', false, false)
|
||
|
if closure > -1 {
|
||
|
closes = segment.Start + closure
|
||
|
next := closure + 1
|
||
|
if next >= len(line) || line[next] != ':' {
|
||
|
return -1, -1
|
||
|
}
|
||
|
block.Advance(next + 1)
|
||
|
break
|
||
|
}
|
||
|
block.AdvanceLine()
|
||
|
}
|
||
|
if closes < 0 {
|
||
|
return -1, -1
|
||
|
}
|
||
|
label := block.Value(text.NewSegment(open, closes))
|
||
|
if util.IsBlank(label) {
|
||
|
return -1, -1
|
||
|
}
|
||
|
block.SkipSpaces()
|
||
|
destination, ok := parseLinkDestination(block)
|
||
|
if !ok {
|
||
|
return -1, -1
|
||
|
}
|
||
|
line, segment = block.PeekLine()
|
||
|
isNewLine := line == nil || util.IsBlank(line)
|
||
|
|
||
|
endLine, _ := block.Position()
|
||
|
_, spaces, _ := block.SkipSpaces()
|
||
|
opener := block.Peek()
|
||
|
if opener != '"' && opener != '\'' && opener != '(' {
|
||
|
if !isNewLine {
|
||
|
return -1, -1
|
||
|
}
|
||
|
ref := NewReference(label, destination, nil)
|
||
|
pc.AddReference(ref)
|
||
|
return startLine, endLine + 1
|
||
|
}
|
||
|
if spaces == 0 {
|
||
|
return -1, -1
|
||
|
}
|
||
|
block.Advance(1)
|
||
|
open = -1
|
||
|
closes = -1
|
||
|
closer := opener
|
||
|
if opener == '(' {
|
||
|
closer = ')'
|
||
|
}
|
||
|
for {
|
||
|
line, segment = block.PeekLine()
|
||
|
if line == nil {
|
||
|
return -1, -1
|
||
|
}
|
||
|
if open < 0 {
|
||
|
open = segment.Start
|
||
|
}
|
||
|
closure := util.FindClosure(line, opener, closer, false, true)
|
||
|
if closure > -1 {
|
||
|
closes = segment.Start + closure
|
||
|
block.Advance(closure + 1)
|
||
|
break
|
||
|
}
|
||
|
block.AdvanceLine()
|
||
|
}
|
||
|
if closes < 0 {
|
||
|
return -1, -1
|
||
|
}
|
||
|
|
||
|
line, segment = block.PeekLine()
|
||
|
if line != nil && !util.IsBlank(line) {
|
||
|
if !isNewLine {
|
||
|
return -1, -1
|
||
|
}
|
||
|
title := block.Value(text.NewSegment(open, closes))
|
||
|
ref := NewReference(label, destination, title)
|
||
|
pc.AddReference(ref)
|
||
|
return startLine, endLine
|
||
|
}
|
||
|
|
||
|
title := block.Value(text.NewSegment(open, closes))
|
||
|
|
||
|
endLine, _ = block.Position()
|
||
|
ref := NewReference(label, destination, title)
|
||
|
pc.AddReference(ref)
|
||
|
return startLine, endLine + 1
|
||
|
}
|