source: node_modules/prismjs/components/prism-protobuf.js

(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));