package lexers

import (

	. "github.com/alecthomas/chroma/v2" // nolint

)

// Markdown lexer.

var Markdown = Register(DelegatingLexer(HTML, MustNewLexer(

	&Config{

		Name:      "markdown",

		Aliases:   []string{"md", "mkd"},

		Filenames: []string{"*.md", "*.mkd", "*.markdown"},

		MimeTypes: []string{"text/x-markdown"},

	},

	markdownRules,

)))

func markdownRules() Rules {

	return Rules{

		"root": {

			{`^(#[^#].+\n)`, ByGroups(GenericHeading), nil},

			{`^(#{2,6}.+\n)`, ByGroups(GenericSubheading), nil},

			{`^(\s*)([*-] )(\[[ xX]\])( .+\n)`, ByGroups(Text, Keyword, Keyword, UsingSelf("inline")), nil},

			{`^(\s*)([*-])(\s)(.+\n)`, ByGroups(Text, Keyword, Text, UsingSelf("inline")), nil},

			{`^(\s*)([0-9]+\.)( .+\n)`, ByGroups(Text, Keyword, UsingSelf("inline")), nil},

			{`^(\s*>\s)(.+\n)`, ByGroups(Keyword, GenericEmph), nil},

			{"^(```\\n)([\\w\\W]*?)(^```$)", ByGroups(String, Text, String), nil},

			{

				"^(```)(\\w+)(\\n)([\\w\\W]*?)(^```$)",

				UsingByGroup(2, 4, String, String, String, Text, String),

				nil,

			},

			Include("inline"),

		},

		"inline": {

			{`\\.`, Text, nil},

			{`(\s)(\*|_)((?:(?!\2).)*)(\2)((?=\W|\n))`, ByGroups(Text, GenericEmph, GenericEmph, GenericEmph, Text), nil},

			{`(\s)((\*\*|__).*?)\3((?=\W|\n))`, ByGroups(Text, GenericStrong, GenericStrong, Text), nil},

			{`(\s)(~~[^~]+~~)((?=\W|\n))`, ByGroups(Text, GenericDeleted, Text), nil},

			{"`[^`]+`", LiteralStringBacktick, nil},

			{`[@#][\w/:]+`, NameEntity, nil},

			{`(!?\[)([^]]+)(\])(\()([^)]+)(\))`, ByGroups(Text, NameTag, Text, Text, NameAttribute, Text), nil},

			{`[^\\\s]+`, Other, nil},

			{`.|\n`, Other, nil},

		},

	}

}