85 lines
2.1 KiB
Go
85 lines
2.1 KiB
Go
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package parser
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import (
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"github.com/yuin/goldmark/ast"
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"github.com/yuin/goldmark/text"
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)
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type codeSpanParser struct {
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}
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var defaultCodeSpanParser = &codeSpanParser{}
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// NewCodeSpanParser return a new InlineParser that parses inline codes
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// surrounded by '`' .
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func NewCodeSpanParser() InlineParser {
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return defaultCodeSpanParser
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}
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func (s *codeSpanParser) Trigger() []byte {
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return []byte{'`'}
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}
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func (s *codeSpanParser) Parse(parent ast.Node, block text.Reader, pc Context) ast.Node {
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line, startSegment := block.PeekLine()
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opener := 0
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for ; opener < len(line) && line[opener] == '`'; opener++ {
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}
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block.Advance(opener)
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l, pos := block.Position()
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node := ast.NewCodeSpan()
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for {
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line, segment := block.PeekLine()
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if line == nil {
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block.SetPosition(l, pos)
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return ast.NewTextSegment(startSegment.WithStop(startSegment.Start + opener))
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}
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for i := 0; i < len(line); i++ {
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c := line[i]
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if c == '`' {
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oldi := i
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for ; i < len(line) && line[i] == '`'; i++ {
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}
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closure := i - oldi
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if closure == opener && (i >= len(line) || line[i] != '`') {
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segment = segment.WithStop(segment.Start + i - closure)
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if !segment.IsEmpty() {
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node.AppendChild(node, ast.NewRawTextSegment(segment))
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}
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block.Advance(i)
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goto end
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}
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}
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}
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node.AppendChild(node, ast.NewRawTextSegment(segment))
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block.AdvanceLine()
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}
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end:
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if !node.IsBlank(block.Source()) {
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// trim first halfspace and last halfspace
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segment := node.FirstChild().(*ast.Text).Segment
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shouldTrimmed := true
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if !(!segment.IsEmpty() && isSpaceOrNewline(block.Source()[segment.Start])) {
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shouldTrimmed = false
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}
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segment = node.LastChild().(*ast.Text).Segment
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if !(!segment.IsEmpty() && isSpaceOrNewline(block.Source()[segment.Stop-1])) {
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shouldTrimmed = false
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}
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if shouldTrimmed {
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t := node.FirstChild().(*ast.Text)
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segment := t.Segment
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t.Segment = segment.WithStart(segment.Start + 1)
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t = node.LastChild().(*ast.Text)
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segment = node.LastChild().(*ast.Text).Segment
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t.Segment = segment.WithStop(segment.Stop - 1)
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}
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}
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return node
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}
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func isSpaceOrNewline(c byte) bool {
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return c == ' ' || c == '\n'
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}
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