groovy.js
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	/*
	Language: Groovy
	Author: Guillaume Laforge <glaforge@gmail.com>
	Description: Groovy programming language implementation inspired from Vsevolod's Java mode
	Website: https://groovy-lang.org
	*/

	function variants(variants, obj = {}) {
	obj.variants = variants;
	return obj;
	}

	function groovy(hljs) {
	const regex = hljs.regex;
	const IDENT_RE = '[A-Za-z0-9_$]+';
	const COMMENT = variants([
	hljs.C_LINE_COMMENT_MODE,
	hljs.C_BLOCK_COMMENT_MODE,
	hljs.COMMENT(
	'/\\\\',
	'\\*/',
	{
	relevance: 0,
	contains: [
	{
	// eat up @'s in emails to prevent them to be recognized as doctags
	begin: /\w+@/,
	relevance: 0
	},
	{
	className: 'doctag',
	begin: '@[A-Za-z]+'
	}
	]
	}
	)
	]);
	const REGEXP = {
	className: 'regexp',
	begin: /~?\/[^\/\n]+\//,
	contains: [ hljs.BACKSLASH_ESCAPE ]
	};
	const NUMBER = variants([
	hljs.BINARY_NUMBER_MODE,
	hljs.C_NUMBER_MODE
	]);
	const STRING = variants([
	{
	begin: /"""/,
	end: /"""/
	},
	{
	begin: /'''/,
	end: /'''/
	},
	{
	begin: "\\$/",
	end: "/\\$",
	relevance: 10
	},
	hljs.APOS_STRING_MODE,
	hljs.QUOTE_STRING_MODE
	],
	{ className: "string" }
	);

	const CLASS_DEFINITION = {
	match: [
	/(class\|interface\|trait\|enum\|extends\|implements)/,
	/\s+/,
	hljs.UNDERSCORE_IDENT_RE
	],
	scope: {
	1: "keyword",
	3: "title.class",
	}
	};
	const TYPES = [
	"byte",
	"short",
	"char",
	"int",
	"long",
	"boolean",
	"float",
	"double",
	"void"
	];
	const KEYWORDS = [
	// groovy specific keywords
	"def",
	"as",
	"in",
	"assert",
	"trait",
	// common keywords with Java
	"abstract",
	"static",
	"volatile",
	"transient",
	"public",
	"private",
	"protected",
	"synchronized",
	"final",
	"class",
	"interface",
	"enum",
	"if",
	"else",
	"for",
	"while",
	"switch",
	"case",
	"break",
	"default",
	"continue",
	"throw",
	"throws",
	"try",
	"catch",
	"finally",
	"implements",
	"extends",
	"new",
	"import",
	"package",
	"return",
	"instanceof"
	];

	return {
	name: 'Groovy',
	keywords: {
	"variable.language": 'this super',
	literal: 'true false null',
	type: TYPES,
	keyword: KEYWORDS
	},
	contains: [
	hljs.SHEBANG({
	binary: "groovy",
	relevance: 10
	}),
	COMMENT,
	STRING,
	REGEXP,
	NUMBER,
	CLASS_DEFINITION,
	{
	className: 'meta',
	begin: '@[A-Za-z]+',
	relevance: 0
	},
	{
	// highlight map keys and named parameters as attrs
	className: 'attr',
	begin: IDENT_RE + '[ \t]*:',
	relevance: 0
	},
	{
	// catch middle element of the ternary operator
	// to avoid highlight it as a label, named parameter, or map key
	begin: /\?/,
	end: /:/,
	relevance: 0,
	contains: [
	COMMENT,
	STRING,
	REGEXP,
	NUMBER,
	'self'
	]
	},
	{
	// highlight labeled statements
	className: 'symbol',
	begin: '^[ \t]*' + regex.lookahead(IDENT_RE + ':'),
	excludeBegin: true,
	end: IDENT_RE + ':',
	relevance: 0
	}
	],
	illegal: /#\|<\//
	};
	}

	module.exports = groovy;

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