markdown.go

Documentation: github.com/alecthomas/chroma/v2/lexers

     1  package lexers
     2  
     3  import (
     4  	. "github.com/alecthomas/chroma/v2" // nolint
     5  )
     6  
     7  // Markdown lexer.
     8  var Markdown = Register(DelegatingLexer(HTML, MustNewLexer(
     9  	&Config{
    10  		Name:      "markdown",
    11  		Aliases:   []string{"md", "mkd"},
    12  		Filenames: []string{"*.md", "*.mkd", "*.markdown"},
    13  		MimeTypes: []string{"text/x-markdown"},
    14  	},
    15  	markdownRules,
    16  )))
    17  
    18  func markdownRules() Rules {
    19  	return Rules{
    20  		"root": {
    21  			{`^(#[^#].+\n)`, ByGroups(GenericHeading), nil},
    22  			{`^(#{2,6}.+\n)`, ByGroups(GenericSubheading), nil},
    23  			{`^(\s*)([*-] )(\[[ xX]\])( .+\n)`, ByGroups(Text, Keyword, Keyword, UsingSelf("inline")), nil},
    24  			{`^(\s*)([*-])(\s)(.+\n)`, ByGroups(Text, Keyword, Text, UsingSelf("inline")), nil},
    25  			{`^(\s*)([0-9]+\.)( .+\n)`, ByGroups(Text, Keyword, UsingSelf("inline")), nil},
    26  			{`^(\s*>\s)(.+\n)`, ByGroups(Keyword, GenericEmph), nil},
    27  			{"^(```\\n)([\\w\\W]*?)(^```$)", ByGroups(String, Text, String), nil},
    28  			{
    29  				"^(```)(\\w+)(\\n)([\\w\\W]*?)(^```$)",
    30  				UsingByGroup(2, 4, String, String, String, Text, String),
    31  				nil,
    32  			},
    33  			Include("inline"),
    34  		},
    35  		"inline": {
    36  			{`\\.`, Text, nil},
    37  			{`(\s)(\*|_)((?:(?!\2).)*)(\2)((?=\W|\n))`, ByGroups(Text, GenericEmph, GenericEmph, GenericEmph, Text), nil},
    38  			{`(\s)((\*\*|__).*?)\3((?=\W|\n))`, ByGroups(Text, GenericStrong, GenericStrong, Text), nil},
    39  			{`(\s)(~~[^~]+~~)((?=\W|\n))`, ByGroups(Text, GenericDeleted, Text), nil},
    40  			{"`[^`]+`", LiteralStringBacktick, nil},
    41  			{`[@#][\w/:]+`, NameEntity, nil},
    42  			{`(!?\[)([^]]+)(\])(\()([^)]+)(\))`, ByGroups(Text, NameTag, Text, Text, NameAttribute, Text), nil},
    43  			{`[^\\\s]+`, Other, nil},
    44  			{`.|\n`, Other, nil},
    45  		},
    46  	}
    47  }
    48
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