63 lines
2.0 KiB
Go
63 lines
2.0 KiB
Go
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package lexers
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import (
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. "github.com/alecthomas/chroma" // nolint
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)
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// Markdown lexer.
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var Markdown = Register(MustNewLexer(
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&Config{
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Name: "markdown",
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Aliases: []string{"md"},
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Filenames: []string{"*.md"},
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MimeTypes: []string{"text/x-markdown"},
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},
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Rules{
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"root": {
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{`^(#)([^#].+\n)`, ByGroups(GenericHeading, Text), nil},
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{`^(#{2,6})(.+\n)`, ByGroups(GenericSubheading, Text), nil},
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{`^(\s*)([*-] )(\[[ xX]\])( .+\n)`, ByGroups(Text, Keyword, Keyword, UsingSelf("inline")), nil},
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{`^(\s*)([*-])(\s)(.+\n)`, ByGroups(Text, Keyword, Text, UsingSelf("inline")), nil},
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{`^(\s*)([0-9]+\.)( .+\n)`, ByGroups(Text, Keyword, UsingSelf("inline")), nil},
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{`^(\s*>\s)(.+\n)`, ByGroups(Keyword, GenericEmph), nil},
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{"^(```\\n)([\\w\\W]*?)(^```$)", ByGroups(LiteralString, Text, LiteralString), nil},
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{"^(```)(\\w+)(\\n)([\\w\\W]*?)(^```$)", EmitterFunc(markdownCodeBlock), nil},
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Include("inline"),
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},
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"inline": {
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{`\\.`, Text, nil},
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{`(\s)([*_][^*_]+[*_])(\W|\n)`, ByGroups(Text, GenericEmph, Text), nil},
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{`(\s)((\*\*|__).*\3)((?=\W|\n))`, ByGroups(Text, GenericStrong, None, Text), nil},
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{`(\s)(~~[^~]+~~)((?=\W|\n))`, ByGroups(Text, GenericDeleted, Text), nil},
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{"`[^`]+`", LiteralStringBacktick, nil},
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{`[@#][\w/:]+`, NameEntity, nil},
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{`(!?\[)([^]]+)(\])(\()([^)]+)(\))`, ByGroups(Text, NameTag, Text, Text, NameAttribute, Text), nil},
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{`[^\\\s]+`, Text, nil},
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{`.`, Text, nil},
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},
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},
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))
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func markdownCodeBlock(groups []string, lexer Lexer) Iterator {
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iterators := []Iterator{}
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tokens := []*Token{
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{String, groups[1]},
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{String, groups[2]},
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{Text, groups[3]},
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}
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code := groups[4]
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lexer = Get(groups[2])
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if lexer == nil {
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tokens = append(tokens, &Token{String, code})
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iterators = append(iterators, Literator(tokens...))
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} else {
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sub, err := lexer.Tokenise(nil, code)
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if err != nil {
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panic(err)
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}
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iterators = append(iterators, Literator(tokens...), sub)
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}
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iterators = append(iterators, Literator(&Token{String, groups[5]}))
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return Concaterator(iterators...)
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}
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