GitFOSS

// https://wren.io/

Prism.languages.wren = {
	// Multiline comments in Wren can have nested multiline comments
	// Comments: // and /* */
	'comment': [
		{
			// support 3 levels of nesting
			// regex: \/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|<self>)*\*\/
			pattern: /\/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|\/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|\/\*(?:[^*/]|\*(?!\/)|\/(?!\*))*\*\/)*\*\/)*\*\//,
			greedy: true
		},
		{
			pattern: /(^|[^\\:])\/\/.*/,
			lookbehind: true,
			greedy: true
		}
	],

	// Triple quoted strings are multiline but cannot have interpolation (raw strings)
	// Based on prism-python.js
	'triple-quoted-string': {
		pattern: /"""[\s\S]*?"""/,
		greedy: true,
		alias: 'string'
	},

	// see below
	'string-literal': null,

	// #!/usr/bin/env wren on the first line
	'hashbang': {
		pattern: /^#!\/.+/,
		greedy: true,
		alias: 'comment'
	},

	// Attributes are special keywords to add meta data to classes
	'attribute': {
		// #! attributes are stored in class properties
		// #!myvar = true
		// #attributes are not stored and dismissed at compilation
		pattern: /#!?[ \t\u3000]*\w+/,
		alias: 'keyword'
	},
	'class-name': [
		{
			// class definition
			// class Meta {}
			pattern: /(\bclass\s+)\w+/,
			lookbehind: true
		},
		// A class must always start with an uppercase.
		// File.read
		/\b[A-Z][a-z\d_]*\b/,
	],

	// A constant can be a variable, class, property or method. Just named in all uppercase letters
	'constant': /\b[A-Z][A-Z\d_]*\b/,

	'null': {
		pattern: /\bnull\b/,
		alias: 'keyword'
	},
	'keyword': /\b(?:as|break|class|construct|continue|else|for|foreign|if|import|in|is|return|static|super|this|var|while)\b/,
	'boolean': /\b(?:false|true)\b/,
	'number': /\b(?:0x[\da-f]+|\d+(?:\.\d+)?(?:e[+-]?\d+)?)\b/i,

	// Functions can be Class.method()
	'function': /\b[a-z_]\w*(?=\s*[({])/i,

	'operator': /<<|>>|[=!<>]=?|&&|\|\||[-+*/%~^&|?:]|\.{2,3}/,
	'punctuation': /[\[\](){}.,;]/,
};

Prism.languages.wren['string-literal'] = {
	// A single quote string is multiline and can have interpolation (similar to JS backticks ``)
	pattern: /(^|[^\\"])"(?:[^\\"%]|\\[\s\S]|%(?!\()|%\((?:[^()]|\((?:[^()]|\([^)]*\))*\))*\))*"/,
	lookbehind: true,
	greedy: true,
	inside: {
		'interpolation': {
			// "%(interpolation)"
			pattern: /((?:^|[^\\])(?:\\{2})*)%\((?:[^()]|\((?:[^()]|\([^)]*\))*\))*\)/,
			lookbehind: true,
			inside: {
				'expression': {
					pattern: /^(%\()[\s\S]+(?=\)$)/,
					lookbehind: true,
					inside: Prism.languages.wren
				},
				'interpolation-punctuation': {
					pattern: /^%\(|\)$/,
					alias: 'punctuation'
				},
			}
		},
		'string': /[\s\S]+/
	}
};