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	/*
	Language: Dart
	Requires: markdown.js
	Author: Maxim Dikun <dikmax@gmail.com>
	Description: Dart a modern, object-oriented language developed by Google. For more information see https://www.dartlang.org/
	Website: https://dart.dev
	Category: scripting
	*/

	/** @type LanguageFn */
	function dart(hljs) {
	const SUBST = {
	className: 'subst',
	variants: [ { begin: '\\$[A-Za-z0-9_]+' } ]
	};

	const BRACED_SUBST = {
	className: 'subst',
	variants: [
	{
	begin: /\$\{/,
	end: /\}/
	}
	],
	keywords: 'true false null this is new super'
	};

	const STRING = {
	className: 'string',
	variants: [
	{
	begin: 'r\'\'\'',
	end: '\'\'\''
	},
	{
	begin: 'r"""',
	end: '"""'
	},
	{
	begin: 'r\'',
	end: '\'',
	illegal: '\\n'
	},
	{
	begin: 'r"',
	end: '"',
	illegal: '\\n'
	},
	{
	begin: '\'\'\'',
	end: '\'\'\'',
	contains: [
	hljs.BACKSLASH_ESCAPE,
	SUBST,
	BRACED_SUBST
	]
	},
	{
	begin: '"""',
	end: '"""',
	contains: [
	hljs.BACKSLASH_ESCAPE,
	SUBST,
	BRACED_SUBST
	]
	},
	{
	begin: '\'',
	end: '\'',
	illegal: '\\n',
	contains: [
	hljs.BACKSLASH_ESCAPE,
	SUBST,
	BRACED_SUBST
	]
	},
	{
	begin: '"',
	end: '"',
	illegal: '\\n',
	contains: [
	hljs.BACKSLASH_ESCAPE,
	SUBST,
	BRACED_SUBST
	]
	}
	]
	};
	BRACED_SUBST.contains = [
	hljs.C_NUMBER_MODE,
	STRING
	];

	const BUILT_IN_TYPES = [
	// dart:core
	'Comparable',
	'DateTime',
	'Duration',
	'Function',
	'Iterable',
	'Iterator',
	'List',
	'Map',
	'Match',
	'Object',
	'Pattern',
	'RegExp',
	'Set',
	'Stopwatch',
	'String',
	'StringBuffer',
	'StringSink',
	'Symbol',
	'Type',
	'Uri',
	'bool',
	'double',
	'int',
	'num',
	// dart:html
	'Element',
	'ElementList'
	];
	const NULLABLE_BUILT_IN_TYPES = BUILT_IN_TYPES.map((e) => `${e}?`);

	const BASIC_KEYWORDS = [
	"abstract",
	"as",
	"assert",
	"async",
	"await",
	"break",
	"case",
	"catch",
	"class",
	"const",
	"continue",
	"covariant",
	"default",
	"deferred",
	"do",
	"dynamic",
	"else",
	"enum",
	"export",
	"extends",
	"extension",
	"external",
	"factory",
	"false",
	"final",
	"finally",
	"for",
	"Function",
	"get",
	"hide",
	"if",
	"implements",
	"import",
	"in",
	"inferface",
	"is",
	"late",
	"library",
	"mixin",
	"new",
	"null",
	"on",
	"operator",
	"part",
	"required",
	"rethrow",
	"return",
	"set",
	"show",
	"static",
	"super",
	"switch",
	"sync",
	"this",
	"throw",
	"true",
	"try",
	"typedef",
	"var",
	"void",
	"while",
	"with",
	"yield"
	];

	const KEYWORDS = {
	keyword: BASIC_KEYWORDS,
	built_in:
	BUILT_IN_TYPES
	.concat(NULLABLE_BUILT_IN_TYPES)
	.concat([
	// dart:core
	'Never',
	'Null',
	'dynamic',
	'print',
	// dart:html
	'document',
	'querySelector',
	'querySelectorAll',
	'window'
	]),
	$pattern: /[A-Za-z][A-Za-z0-9_]*\??/
	};

	return {
	name: 'Dart',
	keywords: KEYWORDS,
	contains: [
	STRING,
	hljs.COMMENT(
	/\/\\(?!\/)/,
	/\*\//,
	{
	subLanguage: 'markdown',
	relevance: 0
	}
	),
	hljs.COMMENT(
	/\/{3,} ?/,
	/$/, { contains: [
	{
	subLanguage: 'markdown',
	begin: '.',
	end: '$',
	relevance: 0
	}
	] }
	),
	hljs.C_LINE_COMMENT_MODE,
	hljs.C_BLOCK_COMMENT_MODE,
	{
	className: 'class',
	beginKeywords: 'class interface',
	end: /\{/,
	excludeEnd: true,
	contains: [
	{ beginKeywords: 'extends implements' },
	hljs.UNDERSCORE_TITLE_MODE
	]
	},
	hljs.C_NUMBER_MODE,
	{
	className: 'meta',
	begin: '@[A-Za-z]+'
	},
	{ begin: '=>' // No markup, just a relevance booster
	}
	]
	};
	}

	module.exports = dart;

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