(function (Prism) {

	var builtinTypes = /\b(?:bool|bytes|double|s?fixed(?:32|64)|float|[su]?int(?:32|64)|string)\b/;

	Prism.languages.protobuf = Prism.languages.extend('clike', {
		'class-name': [
			{
				pattern: /(\b(?:enum|extend|message|service)\s+)[A-Za-z_]\w*(?=\s*\{)/,
				lookbehind: true
			},
			{
				pattern: /(\b(?:rpc\s+\w+|returns)\s*\(\s*(?:stream\s+)?)\.?[A-Za-z_]\w*(?:\.[A-Za-z_]\w*)*(?=\s*\))/,
				lookbehind: true
			}
		],
		'keyword': /\b(?:enum|extend|extensions|import|message|oneof|option|optional|package|public|repeated|required|reserved|returns|rpc(?=\s+\w)|service|stream|syntax|to)\b(?!\s*=\s*\d)/,
		'function': /\b[a-z_]\w*(?=\s*\()/i
	});

	Prism.languages.insertBefore('protobuf', 'operator', {
		'map': {
			pattern: /\bmap<\s*[\w.]+\s*,\s*[\w.]+\s*>(?=\s+[a-z_]\w*\s*[=;])/i,
			alias: 'class-name',
			inside: {
				'punctuation': /[<>.,]/,
				'builtin': builtinTypes
			}
		},
		'builtin': builtinTypes,
		'positional-class-name': {
			pattern: /(?:\b|\B\.)[a-z_]\w*(?:\.[a-z_]\w*)*(?=\s+[a-z_]\w*\s*[=;])/i,
			alias: 'class-name',
			inside: {
				'punctuation': /\./
			}
		},
		'annotation': {
			pattern: /(\[\s*)[a-z_]\w*(?=\s*=)/i,
			lookbehind: true
		}
	});

}(Prism));