markdown.go

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

     1  package m
     2  
     3  import (
     4  	. "github.com/alecthomas/chroma" // nolint
     5  	"github.com/alecthomas/chroma/lexers/h"
     6  	"github.com/alecthomas/chroma/lexers/internal"
     7  )
     8  
     9  // Markdown lexer.
    10  var Markdown = internal.Register(DelegatingLexer(h.HTML, MustNewLazyLexer(
    11  	&Config{
    12  		Name:      "markdown",
    13  		Aliases:   []string{"md", "mkd"},
    14  		Filenames: []string{"*.md", "*.mkd", "*.markdown"},
    15  		MimeTypes: []string{"text/x-markdown"},
    16  	},
    17  	markdownRules,
    18  )))
    19  
    20  func markdownRules() Rules {
    21  	return Rules{
    22  		"root": {
    23  			{`^(#[^#].+\n)`, ByGroups(GenericHeading), nil},
    24  			{`^(#{2,6}.+\n)`, ByGroups(GenericSubheading), nil},
    25  			{`^(\s*)([*-] )(\[[ xX]\])( .+\n)`, ByGroups(Text, Keyword, Keyword, UsingSelf("inline")), nil},
    26  			{`^(\s*)([*-])(\s)(.+\n)`, ByGroups(Text, Keyword, Text, UsingSelf("inline")), nil},
    27  			{`^(\s*)([0-9]+\.)( .+\n)`, ByGroups(Text, Keyword, UsingSelf("inline")), nil},
    28  			{`^(\s*>\s)(.+\n)`, ByGroups(Keyword, GenericEmph), nil},
    29  			{"^(```\\n)([\\w\\W]*?)(^```$)", ByGroups(String, Text, String), nil},
    30  			{
    31  				"^(```)(\\w+)(\\n)([\\w\\W]*?)(^```$)",
    32  				UsingByGroup(
    33  					internal.Get,
    34  					2, 4,
    35  					String, String, String, Text, String,
    36  				),
    37  				nil,
    38  			},
    39  			Include("inline"),
    40  		},
    41  		"inline": {
    42  			{`\\.`, Text, nil},
    43  			{`(\s)(\*|_)((?:(?!\2).)*)(\2)((?=\W|\n))`, ByGroups(Text, GenericEmph, GenericEmph, GenericEmph, Text), nil},
    44  			{`(\s)((\*\*|__).*?)\3((?=\W|\n))`, ByGroups(Text, GenericStrong, GenericStrong, Text), nil},
    45  			{`(\s)(~~[^~]+~~)((?=\W|\n))`, ByGroups(Text, GenericDeleted, Text), nil},
    46  			{"`[^`]+`", LiteralStringBacktick, nil},
    47  			{`[@#][\w/:]+`, NameEntity, nil},
    48  			{`(!?\[)([^]]+)(\])(\()([^)]+)(\))`, ByGroups(Text, NameTag, Text, Text, NameAttribute, Text), nil},
    49  			{`[^\\\s]+`, Other, nil},
    50  			{`.|\n`, Other, nil},
    51  		},
    52  	}
    53  }
    54
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