1package parser
 2
 3import (
 4	"github.com/yuin/goldmark/ast"
 5	"github.com/yuin/goldmark/text"
 6)
 7
 8type codeSpanParser struct {
 9}
10
11var defaultCodeSpanParser = &codeSpanParser{}
12
13// NewCodeSpanParser return a new InlineParser that parses inline codes
14// surrounded by '`' .
15func NewCodeSpanParser() InlineParser {
16	return defaultCodeSpanParser
17}
18
19func (s *codeSpanParser) Trigger() []byte {
20	return []byte{'`'}
21}
22
23func (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	}
57end:
58	if !node.IsBlank(block.Source()) {
59		// trim first halfspace and last halfspace
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
82func isSpaceOrNewline(c byte) bool {
83	return c == ' ' || c == '\n'
84}