27757714d0
* Move to goldmark Markdown rendering moved from blackfriday to the goldmark. Multiple subtle changes required to the goldmark extensions to keep current rendering and defaults. Can go further with goldmark linkify and have this work within markdown rendering making the link processor unnecessary. Need to think about how to go about allowing extensions - at present it seems that these would be hard to do without recompilation. * linter fixes Co-authored-by: Lauris BH <lauris@nix.lv>
109 lines
3.0 KiB
Go
109 lines
3.0 KiB
Go
package parser
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import (
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"bytes"
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"github.com/yuin/goldmark/ast"
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"github.com/yuin/goldmark/text"
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"github.com/yuin/goldmark/util"
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"regexp"
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)
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type rawHTMLParser struct {
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}
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var defaultRawHTMLParser = &rawHTMLParser{}
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// NewRawHTMLParser return a new InlineParser that can parse
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// inline htmls
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func NewRawHTMLParser() InlineParser {
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return defaultRawHTMLParser
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}
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func (s *rawHTMLParser) Trigger() []byte {
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return []byte{'<'}
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}
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func (s *rawHTMLParser) Parse(parent ast.Node, block text.Reader, pc Context) ast.Node {
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line, _ := block.PeekLine()
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if len(line) > 1 && util.IsAlphaNumeric(line[1]) {
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return s.parseMultiLineRegexp(openTagRegexp, block, pc)
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}
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if len(line) > 2 && line[1] == '/' && util.IsAlphaNumeric(line[2]) {
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return s.parseMultiLineRegexp(closeTagRegexp, block, pc)
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}
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if bytes.HasPrefix(line, []byte("<!--")) {
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return s.parseMultiLineRegexp(commentRegexp, block, pc)
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}
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if bytes.HasPrefix(line, []byte("<?")) {
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return s.parseSingleLineRegexp(processingInstructionRegexp, block, pc)
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}
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if len(line) > 2 && line[1] == '!' && line[2] >= 'A' && line[2] <= 'Z' {
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return s.parseSingleLineRegexp(declRegexp, block, pc)
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}
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if bytes.HasPrefix(line, []byte("<![CDATA[")) {
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return s.parseMultiLineRegexp(cdataRegexp, block, pc)
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}
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return nil
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}
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var tagnamePattern = `([A-Za-z][A-Za-z0-9-]*)`
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var attributePattern = `(?:\s+[a-zA-Z_:][a-zA-Z0-9:._-]*(?:\s*=\s*(?:[^\"'=<>` + "`" + `\x00-\x20]+|'[^']*'|"[^"]*"))?)`
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var openTagRegexp = regexp.MustCompile("^<" + tagnamePattern + attributePattern + `*\s*/?>`)
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var closeTagRegexp = regexp.MustCompile("^</" + tagnamePattern + `\s*>`)
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var commentRegexp = regexp.MustCompile(`^<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->`)
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var processingInstructionRegexp = regexp.MustCompile(`^(?:<\?).*?(?:\?>)`)
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var declRegexp = regexp.MustCompile(`^<![A-Z]+\s+[^>]*>`)
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var cdataRegexp = regexp.MustCompile(`<!\[CDATA\[[\s\S]*?\]\]>`)
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func (s *rawHTMLParser) parseSingleLineRegexp(reg *regexp.Regexp, block text.Reader, pc Context) ast.Node {
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line, segment := block.PeekLine()
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match := reg.FindSubmatchIndex(line)
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if match == nil {
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return nil
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}
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node := ast.NewRawHTML()
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node.Segments.Append(segment.WithStop(segment.Start + match[1]))
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block.Advance(match[1])
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return node
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}
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var dummyMatch = [][]byte{}
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func (s *rawHTMLParser) parseMultiLineRegexp(reg *regexp.Regexp, block text.Reader, pc Context) ast.Node {
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sline, ssegment := block.Position()
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if block.Match(reg) {
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node := ast.NewRawHTML()
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eline, esegment := block.Position()
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block.SetPosition(sline, ssegment)
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for {
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line, segment := block.PeekLine()
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if line == nil {
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break
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}
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l, _ := block.Position()
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start := segment.Start
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if l == sline {
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start = ssegment.Start
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}
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end := segment.Stop
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if l == eline {
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end = esegment.Start
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}
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node.Segments.Append(text.NewSegment(start, end))
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if l == eline {
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block.Advance(end - start)
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break
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} else {
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block.AdvanceLine()
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}
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}
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return node
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}
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return nil
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}
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func (s *rawHTMLParser) CloseBlock(parent ast.Node, pc Context) {
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// nothing to do
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}
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