syntax.js

/* http://prismjs.com/download.html?themes=prism&languages=markup+css+clike+javascript+java+scala */
var _self = (typeof window !== 'undefined')
    ? window   // if in browser
    : (
        (typeof WorkerGlobalScope !== 'undefined' && self instanceof WorkerGlobalScope)
        ? self // if in worker
        : {}   // if in node js
    );

/**
 * Prism: Lightweight, robust, elegant syntax highlighting
 * MIT license http://www.opensource.org/licenses/mit-license.php/
 * @author Lea Verou http://lea.verou.me
 */

var Prism = (function(){

// Private helper vars
var lang = /\blang(?:uage)?-(\w+)\b/i;
var uniqueId = 0;

var _ = _self.Prism = {
    util: {
        encode: function (tokens) {
            if (tokens instanceof Token) {
                return new Token(tokens.type, _.util.encode(tokens.content), tokens.alias);
            } else if (_.util.type(tokens) === 'Array') {
                return tokens.map(_.util.encode);
            } else {
                return tokens.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/\u00a0/g, ' ');
            }
        },

        type: function (o) {
            return Object.prototype.toString.call(o).match(/\[object (\w+)\]/)[1];
        },

        objId: function (obj) {
            if (!obj['__id']) {
                Object.defineProperty(obj, '__id', { value: ++uniqueId });
            }
            return obj['__id'];
        },

        // Deep clone a language definition (e.g. to extend it)
        clone: function (o) {
            var type = _.util.type(o);

            switch (type) {
                case 'Object':
                    var clone = {};

                    for (var key in o) {
                        if (o.hasOwnProperty(key)) {
                            clone[key] = _.util.clone(o[key]);
                        }
                    }

                    return clone;

                case 'Array':
                    // Check for existence for IE8
                    return o.map && o.map(function(v) { return _.util.clone(v); });
            }

            return o;
        }
    },

    languages: {
        extend: function (id, redef) {
            var lang = _.util.clone(_.languages[id]);

            for (var key in redef) {
                lang[key] = redef[key];
            }

            return lang;
        },

        /**
         * Insert a token before another token in a language literal
         * As this needs to recreate the object (we cannot actually insert before keys in object literals),
         * we cannot just provide an object, we need anobject and a key.
         * @param inside The key (or language id) of the parent
         * @param before The key to insert before. If not provided, the function appends instead.
         * @param insert Object with the key/value pairs to insert
         * @param root The object that contains `inside`. If equal to Prism.languages, it can be omitted.
         */
        insertBefore: function (inside, before, insert, root) {
            root = root || _.languages;
            var grammar = root[inside];

            if (arguments.length == 2) {
                insert = arguments[1];

                for (var newToken in insert) {
                    if (insert.hasOwnProperty(newToken)) {
                        grammar[newToken] = insert[newToken];
                    }
                }

                return grammar;
            }

            var ret = {};

            for (var token in grammar) {

                if (grammar.hasOwnProperty(token)) {

                    if (token == before) {

                        for (var newToken in insert) {

                            if (insert.hasOwnProperty(newToken)) {
                                ret[newToken] = insert[newToken];
                            }
                        }
                    }

                    ret[token] = grammar[token];
                }
            }

            // Update references in other language definitions
            _.languages.DFS(_.languages, function(key, value) {
                if (value === root[inside] && key != inside) {
                    this[key] = ret;
                }
            });

            return root[inside] = ret;
        },

        // Traverse a language definition with Depth First Search
        DFS: function(o, callback, type, visited) {
            visited = visited || {};
            for (var i in o) {
                if (o.hasOwnProperty(i)) {
                    callback.call(o, i, o[i], type || i);

                    if (_.util.type(o[i]) === 'Object' && !visited[_.util.objId(o[i])]) {
                        visited[_.util.objId(o[i])] = true;
                        _.languages.DFS(o[i], callback, null, visited);
                    }
                    else if (_.util.type(o[i]) === 'Array' && !visited[_.util.objId(o[i])]) {
                        visited[_.util.objId(o[i])] = true;
                        _.languages.DFS(o[i], callback, i, visited);
                    }
                }
            }
        }
    },
    plugins: {},

    highlightAll: function(async, callback) {
        var env = {
            callback: callback,
            selector: 'code[class*="language-"], [class*="language-"] code, code[class*="lang-"], [class*="lang-"] code'
        };

        _.hooks.run("before-highlightall", env);

        var elements = env.elements || document.querySelectorAll(env.selector);

        for (var i=0, element; element = elements[i++];) {
            _.highlightElement(element, async === true, env.callback);
        }
    },

    highlightElement: function(element, async, callback) {
        // Find language
        var language, grammar, parent = element;

        while (parent && !lang.test(parent.className)) {
            parent = parent.parentNode;
        }

        if (parent) {
            language = (parent.className.match(lang) || [,''])[1].toLowerCase();
            grammar = _.languages[language];
        }

        // Set language on the element, if not present
        element.className = element.className.replace(lang, '').replace(/\s+/g, ' ') + ' language-' + language;

        // Set language on the parent, for styling
        parent = element.parentNode;

        if (/pre/i.test(parent.nodeName)) {
            parent.className = parent.className.replace(lang, '').replace(/\s+/g, ' ') + ' language-' + language;
        }

        var code = element.textContent;

        var env = {
            element: element,
            language: language,
            grammar: grammar,
            code: code
        };

        _.hooks.run('before-sanity-check', env);

        if (!env.code || !env.grammar) {
            _.hooks.run('complete', env);
            return;
        }

        _.hooks.run('before-highlight', env);

        if (async && _self.Worker) {
            var worker = new Worker(_.filename);

            worker.onmessage = function(evt) {
                env.highlightedCode = evt.data;

                _.hooks.run('before-insert', env);

                env.element.innerHTML = env.highlightedCode;

                callback && callback.call(env.element);
                _.hooks.run('after-highlight', env);
                _.hooks.run('complete', env);
            };

            worker.postMessage(JSON.stringify({
                language: env.language,
                code: env.code,
                immediateClose: true
            }));
        }
        else {
            env.highlightedCode = _.highlight(env.code, env.grammar, env.language);

            _.hooks.run('before-insert', env);

            env.element.innerHTML = env.highlightedCode;

            callback && callback.call(element);

            _.hooks.run('after-highlight', env);
            _.hooks.run('complete', env);
        }
    },

    highlight: function (text, grammar, language) {
        var tokens = _.tokenize(text, grammar);
        return Token.stringify(_.util.encode(tokens), language);
    },

    tokenize: function(text, grammar, language) {
        var Token = _.Token;

        var strarr = [text];

        var rest = grammar.rest;

        if (rest) {
            for (var token in rest) {
                grammar[token] = rest[token];
            }

            delete grammar.rest;
        }

        tokenloop: for (var token in grammar) {
            if(!grammar.hasOwnProperty(token) || !grammar[token]) {
                continue;
            }

            var patterns = grammar[token];
            patterns = (_.util.type(patterns) === "Array") ? patterns : [patterns];

            for (var j = 0; j < patterns.length; ++j) {
                var pattern = patterns[j],
                    inside = pattern.inside,
                    lookbehind = !!pattern.lookbehind,
                    greedy = !!pattern.greedy,
                    lookbehindLength = 0,
                    alias = pattern.alias;

                if (greedy && !pattern.pattern.global) {
                    // Without the global flag, lastIndex won't work
                    var flags = pattern.pattern.toString().match(/[imuy]*$/)[0];
                    pattern.pattern = RegExp(pattern.pattern.source, flags + "g");
                }

                pattern = pattern.pattern || pattern;

                // Don’t cache length as it changes during the loop
                for (var i=0, pos = 0; i<strarr.length; pos += (strarr[i].matchedStr || strarr[i]).length, ++i) {

                    var str = strarr[i];

                    if (strarr.length > text.length) {
                        // Something went terribly wrong, ABORT, ABORT!
                        break tokenloop;
                    }

                    if (str instanceof Token) {
                        continue;
                    }

                    pattern.lastIndex = 0;

                    var match = pattern.exec(str),
                        delNum = 1;

                    // Greedy patterns can override/remove up to two previously matched tokens
                    if (!match && greedy && i != strarr.length - 1) {
                        pattern.lastIndex = pos;
                        match = pattern.exec(text);
                        if (!match) {
                            break;
                        }

                        var from = match.index + (lookbehind ? match[1].length : 0),
                            to = match.index + match[0].length,
                            k = i,
                            p = pos;

                        for (var len = strarr.length; k < len && p < to; ++k) {
                            p += (strarr[k].matchedStr || strarr[k]).length;
                            // Move the index i to the element in strarr that is closest to from
                            if (from >= p) {
                                ++i;
                                pos = p;
                            }
                        }

                        /*
                         * If strarr[i] is a Token, then the match starts inside another Token, which is invalid
                         * If strarr[k - 1] is greedy we are in conflict with another greedy pattern
                         */
                        if (strarr[i] instanceof Token || strarr[k - 1].greedy) {
                            continue;
                        }

                        // Number of tokens to delete and replace with the new match
                        delNum = k - i;
                        str = text.slice(pos, p);
                        match.index -= pos;
                    }

                    if (!match) {
                        continue;
                    }

                    if(lookbehind) {
                        lookbehindLength = match[1].length;
                    }

                    var from = match.index + lookbehindLength,
                        match = match[0].slice(lookbehindLength),
                        to = from + match.length,
                        before = str.slice(0, from),
                        after = str.slice(to);

                    var args = [i, delNum];

                    if (before) {
                        args.push(before);
                    }

                    var wrapped = new Token(token, inside? _.tokenize(match, inside) : match, alias, match, greedy);

                    args.push(wrapped);

                    if (after) {
                        args.push(after);
                    }

                    Array.prototype.splice.apply(strarr, args);
                }
            }
        }

        return strarr;
    },

    hooks: {
        all: {},

        add: function (name, callback) {
            var hooks = _.hooks.all;

            hooks[name] = hooks[name] || [];

            hooks[name].push(callback);
        },

        run: function (name, env) {
            var callbacks = _.hooks.all[name];

            if (!callbacks || !callbacks.length) {
                return;
            }

            for (var i=0, callback; callback = callbacks[i++];) {
                callback(env);
            }
        }
    }
};

var Token = _.Token = function(type, content, alias, matchedStr, greedy) {
    this.type = type;
    this.content = content;
    this.alias = alias;
    // Copy of the full string this token was created from
    this.matchedStr = matchedStr || null;
    this.greedy = !!greedy;
};

Token.stringify = function(o, language, parent) {
    if (typeof o == 'string') {
        return o;
    }

    if (_.util.type(o) === 'Array') {
        return o.map(function(element) {
            return Token.stringify(element, language, o);
        }).join('');
    }

    var env = {
        type: o.type,
        content: Token.stringify(o.content, language, parent),
        tag: 'span',
        classes: ['token', o.type],
        attributes: {},
        language: language,
        parent: parent
    };

    if (env.type == 'comment') {
        env.attributes['spellcheck'] = 'true';
    }

    if (o.alias) {
        var aliases = _.util.type(o.alias) === 'Array' ? o.alias : [o.alias];
        Array.prototype.push.apply(env.classes, aliases);
    }

    _.hooks.run('wrap', env);

    var attributes = '';

    for (var name in env.attributes) {
        attributes += (attributes ? ' ' : '') + name + '="' + (env.attributes[name] || '') + '"';
    }

    return '<' + env.tag + ' class="' + env.classes.join(' ') + '"' + (attributes ? ' ' + attributes : '') + '>' + env.content + '</' + env.tag + '>';

};

if (!_self.document) {
    if (!_self.addEventListener) {
        // in Node.js
        return _self.Prism;
    }
    // In worker
    _self.addEventListener('message', function(evt) {
        var message = JSON.parse(evt.data),
            lang = message.language,
            code = message.code,
            immediateClose = message.immediateClose;

        _self.postMessage(_.highlight(code, _.languages[lang], lang));
        if (immediateClose) {
            _self.close();
        }
    }, false);

    return _self.Prism;
}

//Get current script and highlight
var script = document.currentScript || [].slice.call(document.getElementsByTagName("script")).pop();

if (script) {
    _.filename = script.src;

    if (document.addEventListener && !script.hasAttribute('data-manual')) {
        if(document.readyState !== "loading") {
            if (window.requestAnimationFrame) {
                window.requestAnimationFrame(_.highlightAll);
            } else {
                window.setTimeout(_.highlightAll, 16);
            }
        }
        else {
            document.addEventListener('DOMContentLoaded', _.highlightAll);
        }
    }
}

return _self.Prism;

})();

if (typeof module !== 'undefined' && module.exports) {
    module.exports = Prism;
}

// hack for components to work correctly in node.js
if (typeof global !== 'undefined') {
    global.Prism = Prism;
}
;
Prism.languages.markup = {
    'comment': /<!--[\w\W]*?-->/,
    'prolog': /<\?[\w\W]+?\?>/,
    'doctype': /<!DOCTYPE[\w\W]+?>/i,
    'cdata': /<!\[CDATA\[[\w\W]*?]]>/i,
    'tag': {
        pattern: /<\/?(?!\d)[^\s>\/=$<]+(?:\s+[^\s>\/=]+(?:=(?:("|')(?:\\\1|\\?(?!\1)[\w\W])*\1|[^\s'">=]+))?)*\s*\/?>/i,
        inside: {
            'tag': {
                pattern: /^<\/?[^\s>\/]+/i,
                inside: {
                    'punctuation': /^<\/?/,
                    'namespace': /^[^\s>\/:]+:/
                }
            },
            'attr-value': {
                pattern: /=(?:('|")[\w\W]*?(\1)|[^\s>]+)/i,
                inside: {
                    'punctuation': /[=>"']/
                }
            },
            'punctuation': /\/?>/,
            'attr-name': {
                pattern: /[^\s>\/]+/,
                inside: {
                    'namespace': /^[^\s>\/:]+:/
                }
            }

        }
    },
    'entity': /&#?[\da-z]{1,8};/i
};

// Plugin to make entity title show the real entity, idea by Roman Komarov
Prism.hooks.add('wrap', function(env) {

    if (env.type === 'entity') {
        env.attributes['title'] = env.content.replace(/&amp;/, '&');
    }
});

Prism.languages.xml = Prism.languages.markup;
Prism.languages.html = Prism.languages.markup;
Prism.languages.mathml = Prism.languages.markup;
Prism.languages.svg = Prism.languages.markup;

Prism.languages.css = {
    'comment': /\/\*[\w\W]*?\*\//,
    'atrule': {
        pattern: /@[\w-]+?.*?(;|(?=\s*\{))/i,
        inside: {
            'rule': /@[\w-]+/
            // See rest below
        }
    },
    'url': /url\((?:(["'])(\\(?:\r\n|[\w\W])|(?!\1)[^\\\r\n])*\1|.*?)\)/i,
    'selector': /[^\{\}\s][^\{\};]*?(?=\s*\{)/,
    'string': {
        pattern: /("|')(\\(?:\r\n|[\w\W])|(?!\1)[^\\\r\n])*\1/,
        greedy: true
    },
    'property': /(\b|\B)[\w-]+(?=\s*:)/i,
    'important': /\B!important\b/i,
    'function': /[-a-z0-9]+(?=\()/i,
    'punctuation': /[(){};:]/
};

Prism.languages.css['atrule'].inside.rest = Prism.util.clone(Prism.languages.css);

if (Prism.languages.markup) {
    Prism.languages.insertBefore('markup', 'tag', {
        'style': {
            pattern: /(<style[\w\W]*?>)[\w\W]*?(?=<\/style>)/i,
            lookbehind: true,
            inside: Prism.languages.css,
            alias: 'language-css'
        }
    });

    Prism.languages.insertBefore('inside', 'attr-value', {
        'style-attr': {
            pattern: /\s*style=("|').*?\1/i,
            inside: {
                'attr-name': {
                    pattern: /^\s*style/i,
                    inside: Prism.languages.markup.tag.inside
                },
                'punctuation': /^\s*=\s*['"]|['"]\s*$/,
                'attr-value': {
                    pattern: /.+/i,
                    inside: Prism.languages.css
                }
            },
            alias: 'language-css'
        }
    }, Prism.languages.markup.tag);
};
Prism.languages.clike = {
    'comment': [
        {
            pattern: /(^|[^\\])\/\*[\w\W]*?\*\//,
            lookbehind: true
        },
        {
            pattern: /(^|[^\\:])\/\/.*/,
            lookbehind: true
        }
    ],
    'string': {
        pattern: /(["'])(\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,
        greedy: true
    },
    'class-name': {
        pattern: /((?:\b(?:class|interface|extends|implements|trait|instanceof|new)\s+)|(?:catch\s+\())[a-z0-9_\.\\]+/i,
        lookbehind: true,
        inside: {
            punctuation: /(\.|\\)/
        }
    },
    'keyword': /\b(if|else|while|do|for|return|in|instanceof|function|new|try|throw|catch|finally|null|break|continue)\b/,
    'boolean': /\b(true|false)\b/,
    'function': /[a-z0-9_]+(?=\()/i,
    'number': /\b-?(?:0x[\da-f]+|\d*\.?\d+(?:e[+-]?\d+)?)\b/i,
    'operator': /--?|\+\+?|!=?=?|<=?|>=?|==?=?|&&?|\|\|?|\?|\*|\/|~|\^|%/,
    'punctuation': /[{}[\];(),.:]/
};

Prism.languages.javascript = Prism.languages.extend('clike', {
    'keyword': /\b(as|async|await|break|case|catch|class|const|continue|debugger|default|delete|do|else|enum|export|extends|finally|for|from|function|get|if|implements|import|in|instanceof|interface|let|new|null|of|package|private|protected|public|return|set|static|super|switch|this|throw|try|typeof|var|void|while|with|yield)\b/,
    'number': /\b-?(0x[\dA-Fa-f]+|0b[01]+|0o[0-7]+|\d*\.?\d+([Ee][+-]?\d+)?|NaN|Infinity)\b/,
    // Allow for all non-ASCII characters (See http://stackoverflow.com/a/2008444)
    'function': /[_$a-zA-Z\xA0-\uFFFF][_$a-zA-Z0-9\xA0-\uFFFF]*(?=\()/i,
    'operator': /--?|\+\+?|!=?=?|<=?|>=?|==?=?|&&?|\|\|?|\?|\*\*?|\/|~|\^|%|\.{3}/
});

Prism.languages.insertBefore('javascript', 'keyword', {
    'regex': {
        pattern: /(^|[^/])\/(?!\/)(\[.+?]|\\.|[^/\\\r\n])+\/[gimyu]{0,5}(?=\s*($|[\r\n,.;})]))/,
        lookbehind: true,
        greedy: true
    }
});

Prism.languages.insertBefore('javascript', 'string', {
    'template-string': {
        pattern: /`(?:\\\\|\\?[^\\])*?`/,
        greedy: true,
        inside: {
            'interpolation': {
                pattern: /\$\{[^}]+\}/,
                inside: {
                    'interpolation-punctuation': {
                        pattern: /^\$\{|\}$/,
                        alias: 'punctuation'
                    },
                    rest: Prism.languages.javascript
                }
            },
            'string': /[\s\S]+/
        }
    }
});

if (Prism.languages.markup) {
    Prism.languages.insertBefore('markup', 'tag', {
        'script': {
            pattern: /(<script[\w\W]*?>)[\w\W]*?(?=<\/script>)/i,
            lookbehind: true,
            inside: Prism.languages.javascript,
            alias: 'language-javascript'
        }
    });
}

Prism.languages.js = Prism.languages.javascript;
Prism.languages.java = Prism.languages.extend('clike', {
    'keyword': /\b(abstract|continue|for|new|switch|assert|default|goto|package|synchronized|boolean|do|if|private|this|break|double|implements|protected|throw|byte|else|import|public|throws|case|enum|instanceof|return|transient|catch|extends|int|short|try|char|final|interface|static|void|class|finally|long|strictfp|volatile|const|float|native|super|while)\b/,
    'number': /\b0b[01]+\b|\b0x[\da-f]*\.?[\da-fp\-]+\b|\b\d*\.?\d+(?:e[+-]?\d+)?[df]?\b/i,
    'operator': {
        pattern: /(^|[^.])(?:\+[+=]?|-[-=]?|!=?|<<?=?|>>?>?=?|==?|&[&=]?|\|[|=]?|\*=?|\/=?|%=?|\^=?|[?:~])/m,
        lookbehind: true
    }
});

Prism.languages.insertBefore('java','function', {
    'annotation': {
        alias: 'punctuation',
        pattern: /(^|[^.])@\w+/,
        lookbehind: true
    }
});

Prism.languages.scala = Prism.languages.extend('java', {
    'keyword': /<-|=>|\b(?:abstract|case|catch|class|def|do|else|extends|final|finally|for|forSome|if|implicit|import|lazy|match|new|null|object|override|package|private|protected|return|sealed|self|super|this|throw|trait|try|type|val|var|while|with|yield)\b/,
    'string': [
        {
            pattern: /"""[\W\w]*?"""/,
            greedy: true
        },
        {
            pattern: /("|')(?:\\\\|\\?[^\\\r\n])*?\1/,
            greedy: true
        },
    ],
    'builtin': /\b(?:String|Int|Long|Short|Byte|Boolean|Double|Float|Char|Any|AnyRef|AnyVal|Unit|Nothing)\b/,
    'number': /\b(?:0x[\da-f]*\.?[\da-f]+|\d*\.?\d+e?\d*[dfl]?)\b/i,
    'symbol': /'[^\d\s\\]\w*/
});
delete Prism.languages.scala['class-name'];
delete Prism.languages.scala['function'];