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1 package parser
2
3 import (
4 "github.com/yuin/goldmark/ast"
5 "github.com/yuin/goldmark/text"
6 )
7
8 type codeSpanParser struct {
9 }
10
11 var defaultCodeSpanParser = &codeSpanParser{}
12
13
14
15 func NewCodeSpanParser() InlineParser {
16 return defaultCodeSpanParser
17 }
18
19 func (s *codeSpanParser) Trigger() []byte {
20 return []byte{'`'}
21 }
22
23 func (s *codeSpanParser) Parse(parent ast.Node, block text.Reader, pc Context) ast.Node {
24 line, startSegment := block.PeekLine()
25 opener := 0
26 for ; opener < len(line) && line[opener] == '`'; opener++ {
27 }
28 block.Advance(opener)
29 l, pos := block.Position()
30 node := ast.NewCodeSpan()
31 for {
32 line, segment := block.PeekLine()
33 if line == nil {
34 block.SetPosition(l, pos)
35 return ast.NewTextSegment(startSegment.WithStop(startSegment.Start + opener))
36 }
37 for i := 0; i < len(line); i++ {
38 c := line[i]
39 if c == '`' {
40 oldi := i
41 for ; i < len(line) && line[i] == '`'; i++ {
42 }
43 closure := i - oldi
44 if closure == opener && (i >= len(line) || line[i] != '`') {
45 segment = segment.WithStop(segment.Start + i - closure)
46 if !segment.IsEmpty() {
47 node.AppendChild(node, ast.NewRawTextSegment(segment))
48 }
49 block.Advance(i)
50 goto end
51 }
52 }
53 }
54 node.AppendChild(node, ast.NewRawTextSegment(segment))
55 block.AdvanceLine()
56 }
57 end:
58 if !node.IsBlank(block.Source()) {
59
60 segment := node.FirstChild().(*ast.Text).Segment
61 shouldTrimmed := true
62 if !(!segment.IsEmpty() && isSpaceOrNewline(block.Source()[segment.Start])) {
63 shouldTrimmed = false
64 }
65 segment = node.LastChild().(*ast.Text).Segment
66 if !(!segment.IsEmpty() && isSpaceOrNewline(block.Source()[segment.Stop-1])) {
67 shouldTrimmed = false
68 }
69 if shouldTrimmed {
70 t := node.FirstChild().(*ast.Text)
71 segment := t.Segment
72 t.Segment = segment.WithStart(segment.Start + 1)
73 t = node.LastChild().(*ast.Text)
74 segment = node.LastChild().(*ast.Text).Segment
75 t.Segment = segment.WithStop(segment.Stop - 1)
76 }
77
78 }
79 return node
80 }
81
82 func isSpaceOrNewline(c byte) bool {
83 return c == ' ' || c == '\n'
84 }
85
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