// Copyright (C) 2013 Google Inc.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  
  // Looks at query parameters to decide which language handlers and style-sheets
  // to load.
  
  // Query Parameter     Format           Effect                        Default
  // +------------------+---------------+------------------------------+--------+
  // | autorun=         | true | false  | If true then prettyPrint()   | "true" |
  // |                  |               | is called on page load.      |        |
  // +------------------+---------------+------------------------------+--------+
  // | lang=            | language name | Loads the language handler   | Can    |
  // |                  |               | named "lang-<NAME>.js".      | appear |
  // |                  |               | See available handlers at    | many   |
  // |                  |               | http://code.google.com/p/    | times. |
  // |                  |               | google-code-prettify/source/ |        |
  // |                  |               | browse/trunk/src             |        |
  // +------------------+---------------+------------------------------+--------+
  // | skin=            | skin name     | Loads the skin stylesheet    | none.  |
  // |                  |               | named "<NAME>.css".          |        |
  // |                  |               | http://code.google.com/p/    |        |
  // |                  |               | google-code-prettify/source/ |        |
  // |                  |               | browse/trunk/styles          |        |
  // +------------------+---------------+------------------------------+--------+
  // | callback=        | JS identifier | When "prettyPrint" finishes  | none   |
  // |                  |               | window.exports[js_ident] is  |        |
  // |                  |               | called.                      |        |
  // |                  |               | The callback must be under   |        |
  // |                  |               | exports to reduce the risk   |        |
  // |                  |               | of XSS via query parameter   |        |
  // |                  |               | injection.                   |        |
  // +------------------+---------------+------------------------------+--------+
  
  // Exmaples
  // .../prettify.js?lang=css&skin=sunburst
  //   1. Loads the CSS language handler which can be used to prettify CSS
  //      stylesheets, HTML <style> element bodies and style="..." attributes
  //      values.
  //   2. Loads the sunburst.css stylesheet instead of the default prettify.css
  //      stylesheet.
  //      A gallery of stylesheets is available at
  //      https://google-code-prettify.googlecode.com/svn/trunk/styles/index.html
  //   3. Since autorun=false is not specified, calls prettyPrint() on page load.
  
  
  /** @define {boolean} */
  var IN_GLOBAL_SCOPE = false;
  
  (function () {
    "use strict";
  
    var win = window;
    var setTimeout = win.setTimeout;
    var doc = document;
    var root = doc.documentElement;
    var head = doc['head'] || doc.getElementsByTagName("head")[0] || root;
  
    // From http://javascript.nwbox.com/ContentLoaded/contentloaded.js
    // Author: Diego Perini (diego.perini at gmail.com)
    // Summary: cross-browser wrapper for DOMContentLoaded
    // Updated: 20101020
    // License: MIT
    // Version: 1.2
    function contentLoaded(callback) {
      var addEventListener = doc['addEventListener'];
      var done = false, top = true,
          add = addEventListener ? 'addEventListener' : 'attachEvent',
          rem = addEventListener ? 'removeEventListener' : 'detachEvent',
          pre = addEventListener ? '' : 'on',
  
          init = function(e) {
            if (e.type == 'readystatechange' && doc.readyState != 'complete') {
              return;
            }
            (e.type == 'load' ? win : doc)[rem](pre + e.type, init, false);
            if (!done && (done = true)) { callback.call(win, e.type || e); }
          },
  
          poll = function() {
            try {
              root.doScroll('left');
            } catch(e) {
              setTimeout(poll, 50);
              return;
            }
            init('poll');
          };
  
      if (doc.readyState == 'complete') {
        callback.call(win, 'lazy');
      } else {
        if (doc.createEventObject && root.doScroll) {
          try { top = !win.frameElement; } catch(e) { }
          if (top) { poll(); }
        }
        doc[add](pre + 'DOMContentLoaded', init, false);
        doc[add](pre + 'readystatechange', init, false);
        win[add](pre + 'load', init, false);
      }
    }
  
    // Given a list of URLs to stylesheets, loads the first that loads without
    // triggering an error event.
    function loadStylesheetsFallingBack(stylesheets) {
      var n = stylesheets.length;
      function load(i) {
        if (i === n) { return; }
        var link = doc.createElement('link');
        link.rel = 'stylesheet';
        link.type = 'text/css';
        if (i + 1 < n) {
          // http://pieisgood.org/test/script-link-events/ indicates that many
          // versions of IE do not support onerror on <link>s, though
          // http://msdn.microsoft.com/en-us/library/ie/ms535848(v=vs.85).aspx
          // indicates that recent IEs do support error.
          link.error = link.onerror = function () { load(i + 1); };
        }
        link.href = stylesheets[i];
        head.appendChild(link);
      }
      load(0);
    }
  
    var scriptQuery = '';
    // Look for the <script> node that loads this script to get its parameters.
    // This starts looking at the end instead of just considering the last
    // because deferred and async scripts run out of order.
    // If the script is loaded twice, then this will run in reverse order.
    for (var scripts = doc.scripts, i = scripts.length; --i >= 0;) {
      var script = scripts[i];
      var match = script.src.match(
          /^[^?#]*\/run_prettify\.js(\?[^#]*)?(?:#.*)?$/);
      if (match) {
        scriptQuery = match[1] || '';
        // Remove the script from the DOM so that multiple runs at least run
        // multiple times even if parameter sets are interpreted in reverse
        // order.
        script.parentNode.removeChild(script);
        break;
      }
    }
  
    // Pull parameters into local variables.
    var autorun = true;
    var langs = [];
    var skins = [];
    var callbacks = [];
    scriptQuery.replace(
        /[?&]([^&=]+)=([^&]+)/g,
        function (_, name, value) {
          value = decodeURIComponent(value);
          name = decodeURIComponent(name);
          if (name == 'autorun')   { autorun = !/^[0fn]/i.test(value); } else
          if (name == 'lang')      { langs.push(value);                } else
          if (name == 'skin')      { skins.push(value);                } else
          if (name == 'callback')  { callbacks.push(value);            }
        });
  
    // Use https to avoid mixed content warnings in client pages and to
    // prevent a MITM from rewrite prettify mid-flight.
    // This only works if this script is loaded via https : something
    // over which we exercise no control.
    var LOADER_BASE_URL =
       'https://google-code-prettify.googlecode.com/svn/loader';
  
    for (var i = 0, n = langs.length; i < n; ++i) (function (lang) {
      var script = doc.createElement("script");
  
      // Excerpted from jQuery.ajaxTransport("script") to fire events when
      // a script is finished loading.
      // Attach handlers for each script
      script.onload = script.onerror = script.onreadystatechange = function () {
        if (script && (
              !script.readyState || /loaded|complete/.test(script.readyState))) {
          // Handle memory leak in IE
          script.onerror = script.onload = script.onreadystatechange = null;
  
          --pendingLanguages;
          checkPendingLanguages();
  
          // Remove the script
          if (script.parentNode) {
            script.parentNode.removeChild(script);
          }
  
          script = null;
        }
      };
  
      script.type = 'text/javascript';
      script.src = LOADER_BASE_URL
        + '/lang-' + encodeURIComponent(langs[i]) + '.js';
  
      // Circumvent IE6 bugs with base elements (#2709 and #4378) by prepending
      head.insertBefore(script, head.firstChild);
    })(langs[i]);
  
    var pendingLanguages = langs.length;
    function checkPendingLanguages() {
      if (!pendingLanguages) {
        setTimeout(onLangsLoaded, 0);
      }
    }
  
    var skinUrls = [];
    for (var i = 0, n = skins.length; i < n; ++i) {
      skinUrls.push(LOADER_BASE_URL
          + '/skins/' + encodeURIComponent(skins[i]) + '.css');
    }
    skinUrls.push(LOADER_BASE_URL + '/prettify.css');
    loadStylesheetsFallingBack(skinUrls);
  
    var prettyPrint = (function () {
      // Copyright (C) 2006 Google Inc.
      //
      // Licensed under the Apache License, Version 2.0 (the "License");
      // you may not use this file except in compliance with the License.
      // You may obtain a copy of the License at
      //
      //      http://www.apache.org/licenses/LICENSE-2.0
      //
      // Unless required by applicable law or agreed to in writing, software
      // distributed under the License is distributed on an "AS IS" BASIS,
      // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      // See the License for the specific language governing permissions and
      // limitations under the License.
      
      
      /**
       * @fileoverview
       * some functions for browser-side pretty printing of code contained in html.
       *
       * <p>
       * For a fairly comprehensive set of languages see the
       * <a href="http://google-code-prettify.googlecode.com/svn/trunk/README.html#langs">README</a>
       * file that came with this source.  At a minimum, the lexer should work on a
       * number of languages including C and friends, Java, Python, Bash, SQL, HTML,
       * XML, CSS, Javascript, and Makefiles.  It works passably on Ruby, PHP and Awk
       * and a subset of Perl, but, because of commenting conventions, doesn't work on
       * Smalltalk, Lisp-like, or CAML-like languages without an explicit lang class.
       * <p>
       * Usage: <ol>
       * <li> include this source file in an html page via
       *   {@code <script type="text/javascript" src="/path/to/prettify.js"></script>}
       * <li> define style rules.  See the example page for examples.
       * <li> mark the {@code <pre>} and {@code <code>} tags in your source with
       *    {@code class=prettyprint.}
       *    You can also use the (html deprecated) {@code <xmp>} tag, but the pretty
       *    printer needs to do more substantial DOM manipulations to support that, so
       *    some css styles may not be preserved.
       * </ol>
       * That's it.  I wanted to keep the API as simple as possible, so there's no
       * need to specify which language the code is in, but if you wish, you can add
       * another class to the {@code <pre>} or {@code <code>} element to specify the
       * language, as in {@code <pre class="prettyprint lang-java">}.  Any class that
       * starts with "lang-" followed by a file extension, specifies the file type.
       * See the "lang-*.js" files in this directory for code that implements
       * per-language file handlers.
       * <p>
       * Change log:<br>
       * cbeust, 2006/08/22
       * <blockquote>
       *   Java annotations (start with "@") are now captured as literals ("lit")
       * </blockquote>
       * @requires console
       */
      
      // JSLint declarations
      /*global console, document, navigator, setTimeout, window, define */
      
      /**
       * Split {@code prettyPrint} into multiple timeouts so as not to interfere with
       * UI events.
       * If set to {@code false}, {@code prettyPrint()} is synchronous.
       */
      window['PR_SHOULD_USE_CONTINUATION'] = true;
      
      /**
       * Pretty print a chunk of code.
       * @param {string} sourceCodeHtml The HTML to pretty print.
       * @param {string} opt_langExtension The language name to use.
       *     Typically, a filename extension like 'cpp' or 'java'.
       * @param {number|boolean} opt_numberLines True to number lines,
       *     or the 1-indexed number of the first line in sourceCodeHtml.
       * @return {string} code as html, but prettier
       */
      var prettyPrintOne;
      /**
       * Find all the {@code <pre>} and {@code <code>} tags in the DOM with
       * {@code class=prettyprint} and prettify them.
       *
       * @param {Function} opt_whenDone called when prettifying is done.
       * @param {HTMLElement|HTMLDocument} opt_root an element or document
       *   containing all the elements to pretty print.
       *   Defaults to {@code document.body}.
       */
      var prettyPrint;
      
      
      (function () {
        var win = window;
        // Keyword lists for various languages.
        // We use things that coerce to strings to make them compact when minified
        // and to defeat aggressive optimizers that fold large string constants.
        var FLOW_CONTROL_KEYWORDS = ["break,continue,do,else,for,if,return,while"];
        var C_KEYWORDS = [FLOW_CONTROL_KEYWORDS,"auto,case,char,const,default," + 
            "double,enum,extern,float,goto,inline,int,long,register,short,signed," +
            "sizeof,static,struct,switch,typedef,union,unsigned,void,volatile"];
        var COMMON_KEYWORDS = [C_KEYWORDS,"catch,class,delete,false,import," +
            "new,operator,private,protected,public,this,throw,true,try,typeof"];
        var CPP_KEYWORDS = [COMMON_KEYWORDS,"alignof,align_union,asm,axiom,bool," +
            "concept,concept_map,const_cast,constexpr,decltype,delegate," +
            "dynamic_cast,explicit,export,friend,generic,late_check," +
            "mutable,namespace,nullptr,property,reinterpret_cast,static_assert," +
            "static_cast,template,typeid,typename,using,virtual,where"];
        var JAVA_KEYWORDS = [COMMON_KEYWORDS,
            "abstract,assert,boolean,byte,extends,final,finally,implements,import," +
            "instanceof,interface,null,native,package,strictfp,super,synchronized," +
            "throws,transient"];
        var CSHARP_KEYWORDS = [JAVA_KEYWORDS,
            "as,base,by,checked,decimal,delegate,descending,dynamic,event," +
            "fixed,foreach,from,group,implicit,in,internal,into,is,let," +
            "lock,object,out,override,orderby,params,partial,readonly,ref,sbyte," +
            "sealed,stackalloc,string,select,uint,ulong,unchecked,unsafe,ushort," +
            "var,virtual,where"];
        var COFFEE_KEYWORDS = "all,and,by,catch,class,else,extends,false,finally," +
            "for,if,in,is,isnt,loop,new,no,not,null,of,off,on,or,return,super,then," +
            "throw,true,try,unless,until,when,while,yes";
        var JSCRIPT_KEYWORDS = [COMMON_KEYWORDS,
            "debugger,eval,export,function,get,null,set,undefined,var,with," +
            "Infinity,NaN"];
        var PERL_KEYWORDS = "caller,delete,die,do,dump,elsif,eval,exit,foreach,for," +
            "goto,if,import,last,local,my,next,no,our,print,package,redo,require," +
            "sub,undef,unless,until,use,wantarray,while,BEGIN,END";
        var PYTHON_KEYWORDS = [FLOW_CONTROL_KEYWORDS, "and,as,assert,class,def,del," +
            "elif,except,exec,finally,from,global,import,in,is,lambda," +
            "nonlocal,not,or,pass,print,raise,try,with,yield," +
            "False,True,None"];
        var RUBY_KEYWORDS = [FLOW_CONTROL_KEYWORDS, "alias,and,begin,case,class," +
            "def,defined,elsif,end,ensure,false,in,module,next,nil,not,or,redo," +
            "rescue,retry,self,super,then,true,undef,unless,until,when,yield," +
            "BEGIN,END"];
         var RUST_KEYWORDS = [FLOW_CONTROL_KEYWORDS, "as,assert,const,copy,drop," +
            "enum,extern,fail,false,fn,impl,let,log,loop,match,mod,move,mut,priv," +
            "pub,pure,ref,self,static,struct,true,trait,type,unsafe,use"];
        var SH_KEYWORDS = [FLOW_CONTROL_KEYWORDS, "case,done,elif,esac,eval,fi," +
            "function,in,local,set,then,until"];
        var ALL_KEYWORDS = [
            CPP_KEYWORDS, CSHARP_KEYWORDS, JSCRIPT_KEYWORDS, PERL_KEYWORDS,
            PYTHON_KEYWORDS, RUBY_KEYWORDS, SH_KEYWORDS];
        var C_TYPES = /^(DIR|FILE|vector|(de|priority_)?queue|list|stack|(const_)?iterator|(multi)?(set|map)|bitset|u?(int|float)\d*)\b/;
      
        // token style names.  correspond to css classes
        /**
         * token style for a string literal
         * @const
         */
        var PR_STRING = 'str';
        /**
         * token style for a keyword
         * @const
         */
        var PR_KEYWORD = 'kwd';
        /**
         * token style for a comment
         * @const
         */
        var PR_COMMENT = 'com';
        /**
         * token style for a type
         * @const
         */
        var PR_TYPE = 'typ';
        /**
         * token style for a literal value.  e.g. 1, null, true.
         * @const
         */
        var PR_LITERAL = 'lit';
        /**
         * token style for a punctuation string.
         * @const
         */
        var PR_PUNCTUATION = 'pun';
        /**
         * token style for plain text.
         * @const
         */
        var PR_PLAIN = 'pln';
      
        /**
         * token style for an sgml tag.
         * @const
         */
        var PR_TAG = 'tag';
        /**
         * token style for a markup declaration such as a DOCTYPE.
         * @const
         */
        var PR_DECLARATION = 'dec';
        /**
         * token style for embedded source.
         * @const
         */
        var PR_SOURCE = 'src';
        /**
         * token style for an sgml attribute name.
         * @const
         */
        var PR_ATTRIB_NAME = 'atn';
        /**
         * token style for an sgml attribute value.
         * @const
         */
        var PR_ATTRIB_VALUE = 'atv';
      
        /**
         * A class that indicates a section of markup that is not code, e.g. to allow
         * embedding of line numbers within code listings.
         * @const
         */
        var PR_NOCODE = 'nocode';
      
        
        
        /**
         * A set of tokens that can precede a regular expression literal in
         * javascript
         * http://web.archive.org/web/20070717142515/http://www.mozilla.org/js/language/js20/rationale/syntax.html
         * has the full list, but I've removed ones that might be problematic when
         * seen in languages that don't support regular expression literals.
         *
         * <p>Specifically, I've removed any keywords that can't precede a regexp
         * literal in a syntactically legal javascript program, and I've removed the
         * "in" keyword since it's not a keyword in many languages, and might be used
         * as a count of inches.
         *
         * <p>The link above does not accurately describe EcmaScript rules since
         * it fails to distinguish between (a=++/b/i) and (a++/b/i) but it works
         * very well in practice.
         *
         * @private
         * @const
         */
        var REGEXP_PRECEDER_PATTERN = '(?:^^\\.?|[+-]|[!=]=?=?|\\#|%=?|&&?=?|\\(|\\*=?|[+\\-]=|->|\\/=?|::?|<<?=?|>>?>?=?|,|;|\\?|@|\\[|~|{|\\^\\^?=?|\\|\\|?=?|break|case|continue|delete|do|else|finally|instanceof|return|throw|try|typeof)\\s*';
        
        // CAVEAT: this does not properly handle the case where a regular
        // expression immediately follows another since a regular expression may
        // have flags for case-sensitivity and the like.  Having regexp tokens
        // adjacent is not valid in any language I'm aware of, so I'm punting.
        // TODO: maybe style special characters inside a regexp as punctuation.
      
        /**
         * Given a group of {@link RegExp}s, returns a {@code RegExp} that globally
         * matches the union of the sets of strings matched by the input RegExp.
         * Since it matches globally, if the input strings have a start-of-input
         * anchor (/^.../), it is ignored for the purposes of unioning.
         * @param {Array.<RegExp>} regexs non multiline, non-global regexs.
         * @return {RegExp} a global regex.
         */
        function combinePrefixPatterns(regexs) {
          var capturedGroupIndex = 0;
        
          var needToFoldCase = false;
          var ignoreCase = false;
          for (var i = 0, n = regexs.length; i < n; ++i) {
            var regex = regexs[i];
            if (regex.ignoreCase) {
              ignoreCase = true;
            } else if (/[a-z]/i.test(regex.source.replace(
                           /\\u[0-9a-f]{4}|\\x[0-9a-f]{2}|\\[^ux]/gi, ''))) {
              needToFoldCase = true;
              ignoreCase = false;
              break;
            }
          }
        
          var escapeCharToCodeUnit = {
            'b': 8,
            't': 9,
            'n': 0xa,
            'v': 0xb,
            'f': 0xc,
            'r': 0xd
          };
        
          function decodeEscape(charsetPart) {
            var cc0 = charsetPart.charCodeAt(0);
            if (cc0 !== 92 /* \\ */) {
              return cc0;
            }
            var c1 = charsetPart.charAt(1);
            cc0 = escapeCharToCodeUnit[c1];
            if (cc0) {
              return cc0;
            } else if ('0' <= c1 && c1 <= '7') {
              return parseInt(charsetPart.substring(1), 8);
            } else if (c1 === 'u' || c1 === 'x') {
              return parseInt(charsetPart.substring(2), 16);
            } else {
              return charsetPart.charCodeAt(1);
            }
          }
        
          function encodeEscape(charCode) {
            if (charCode < 0x20) {
              return (charCode < 0x10 ? '\\x0' : '\\x') + charCode.toString(16);
            }
            var ch = String.fromCharCode(charCode);
            return (ch === '\\' || ch === '-' || ch === ']' || ch === '^')
                ? "\\" + ch : ch;
          }
        
          function caseFoldCharset(charSet) {
            var charsetParts = charSet.substring(1, charSet.length - 1).match(
                new RegExp(
                    '\\\\u[0-9A-Fa-f]{4}'
                    + '|\\\\x[0-9A-Fa-f]{2}'
                    + '|\\\\[0-3][0-7]{0,2}'
                    + '|\\\\[0-7]{1,2}'
                    + '|\\\\[\\s\\S]'
                    + '|-'
                    + '|[^-\\\\]',
                    'g'));
            var ranges = [];
            var inverse = charsetParts[0] === '^';
        
            var out = ['['];
            if (inverse) { out.push('^'); }
        
            for (var i = inverse ? 1 : 0, n = charsetParts.length; i < n; ++i) {
              var p = charsetParts[i];
              if (/\\[bdsw]/i.test(p)) {  // Don't muck with named groups.
                out.push(p);
              } else {
                var start = decodeEscape(p);
                var end;
                if (i + 2 < n && '-' === charsetParts[i + 1]) {
                  end = decodeEscape(charsetParts[i + 2]);
                  i += 2;
                } else {
                  end = start;
                }
                ranges.push([start, end]);
                // If the range might intersect letters, then expand it.
                // This case handling is too simplistic.
                // It does not deal with non-latin case folding.
                // It works for latin source code identifiers though.
                if (!(end < 65 || start > 122)) {
                  if (!(end < 65 || start > 90)) {
                    ranges.push([Math.max(65, start) | 32, Math.min(end, 90) | 32]);
                  }
                  if (!(end < 97 || start > 122)) {
                    ranges.push([Math.max(97, start) & ~32, Math.min(end, 122) & ~32]);
                  }
                }
              }
            }
        
            // [[1, 10], [3, 4], [8, 12], [14, 14], [16, 16], [17, 17]]
            // -> [[1, 12], [14, 14], [16, 17]]
            ranges.sort(function (a, b) { return (a[0] - b[0]) || (b[1]  - a[1]); });
            var consolidatedRanges = [];
            var lastRange = [];
            for (var i = 0; i < ranges.length; ++i) {
              var range = ranges[i];
              if (range[0] <= lastRange[1] + 1) {
                lastRange[1] = Math.max(lastRange[1], range[1]);
              } else {
                consolidatedRanges.push(lastRange = range);
              }
            }
        
            for (var i = 0; i < consolidatedRanges.length; ++i) {
              var range = consolidatedRanges[i];
              out.push(encodeEscape(range[0]));
              if (range[1] > range[0]) {
                if (range[1] + 1 > range[0]) { out.push('-'); }
                out.push(encodeEscape(range[1]));
              }
            }
            out.push(']');
            return out.join('');
          }
        
          function allowAnywhereFoldCaseAndRenumberGroups(regex) {
            // Split into character sets, escape sequences, punctuation strings
            // like ('(', '(?:', ')', '^'), and runs of characters that do not
            // include any of the above.
            var parts = regex.source.match(
                new RegExp(
                    '(?:'
                    + '\\[(?:[^\\x5C\\x5D]|\\\\[\\s\\S])*\\]'  // a character set
                    + '|\\\\u[A-Fa-f0-9]{4}'  // a unicode escape
                    + '|\\\\x[A-Fa-f0-9]{2}'  // a hex escape
                    + '|\\\\[0-9]+'  // a back-reference or octal escape
                    + '|\\\\[^ux0-9]'  // other escape sequence
                    + '|\\(\\?[:!=]'  // start of a non-capturing group
                    + '|[\\(\\)\\^]'  // start/end of a group, or line start
                    + '|[^\\x5B\\x5C\\(\\)\\^]+'  // run of other characters
                    + ')',
                    'g'));
            var n = parts.length;
        
            // Maps captured group numbers to the number they will occupy in
            // the output or to -1 if that has not been determined, or to
            // undefined if they need not be capturing in the output.
            var capturedGroups = [];
        
            // Walk over and identify back references to build the capturedGroups
            // mapping.
            for (var i = 0, groupIndex = 0; i < n; ++i) {
              var p = parts[i];
              if (p === '(') {
                // groups are 1-indexed, so max group index is count of '('
                ++groupIndex;
              } else if ('\\' === p.charAt(0)) {
                var decimalValue = +p.substring(1);
                if (decimalValue) {
                  if (decimalValue <= groupIndex) {
                    capturedGroups[decimalValue] = -1;
                  } else {
                    // Replace with an unambiguous escape sequence so that
                    // an octal escape sequence does not turn into a backreference
                    // to a capturing group from an earlier regex.
                    parts[i] = encodeEscape(decimalValue);
                  }
                }
              }
            }
        
            // Renumber groups and reduce capturing groups to non-capturing groups
            // where possible.
            for (var i = 1; i < capturedGroups.length; ++i) {
              if (-1 === capturedGroups[i]) {
                capturedGroups[i] = ++capturedGroupIndex;
              }
            }
            for (var i = 0, groupIndex = 0; i < n; ++i) {
              var p = parts[i];
              if (p === '(') {
                ++groupIndex;
                if (!capturedGroups[groupIndex]) {
                  parts[i] = '(?:';
                }
              } else if ('\\' === p.charAt(0)) {
                var decimalValue = +p.substring(1);
                if (decimalValue && decimalValue <= groupIndex) {
                  parts[i] = '\\' + capturedGroups[decimalValue];
                }
              }
            }
        
            // Remove any prefix anchors so that the output will match anywhere.
            // ^^ really does mean an anchored match though.
            for (var i = 0; i < n; ++i) {
              if ('^' === parts[i] && '^' !== parts[i + 1]) { parts[i] = ''; }
            }
        
            // Expand letters to groups to handle mixing of case-sensitive and
            // case-insensitive patterns if necessary.
            if (regex.ignoreCase && needToFoldCase) {
              for (var i = 0; i < n; ++i) {
                var p = parts[i];
                var ch0 = p.charAt(0);
                if (p.length >= 2 && ch0 === '[') {
                  parts[i] = caseFoldCharset(p);
                } else if (ch0 !== '\\') {
                  // TODO: handle letters in numeric escapes.
                  parts[i] = p.replace(
                      /[a-zA-Z]/g,
                      function (ch) {
                        var cc = ch.charCodeAt(0);
                        return '[' + String.fromCharCode(cc & ~32, cc | 32) + ']';
                      });
                }
              }
            }
        
            return parts.join('');
          }
        
          var rewritten = [];
          for (var i = 0, n = regexs.length; i < n; ++i) {
            var regex = regexs[i];
            if (regex.global || regex.multiline) { throw new Error('' + regex); }
            rewritten.push(
                '(?:' + allowAnywhereFoldCaseAndRenumberGroups(regex) + ')');
          }
        
          return new RegExp(rewritten.join('|'), ignoreCase ? 'gi' : 'g');
        }
      
        /**
         * Split markup into a string of source code and an array mapping ranges in
         * that string to the text nodes in which they appear.
         *
         * <p>
         * The HTML DOM structure:</p>
         * <pre>
         * (Element   "p"
         *   (Element "b"
         *     (Text  "print "))       ; #1
         *   (Text    "'Hello '")      ; #2
         *   (Element "br")            ; #3
         *   (Text    "  + 'World';")) ; #4
         * </pre>
         * <p>
         * corresponds to the HTML
         * {@code <p><b>print </b>'Hello '<br>  + 'World';</p>}.</p>
         *
         * <p>
         * It will produce the output:</p>
         * <pre>
         * {
         *   sourceCode: "print 'Hello '
    + 'World';",
         *   //                     1          2
         *   //           012345678901234 5678901234567
         *   spans: [0, #1, 6, #2, 14, #3, 15, #4]
         * }
         * </pre>
         * <p>
         * where #1 is a reference to the {@code "print "} text node above, and so
         * on for the other text nodes.
         * </p>
         *
         * <p>
         * The {@code} spans array is an array of pairs.  Even elements are the start
         * indices of substrings, and odd elements are the text nodes (or BR elements)
         * that contain the text for those substrings.
         * Substrings continue until the next index or the end of the source.
         * </p>
         *
         * @param {Node} node an HTML DOM subtree containing source-code.
         * @param {boolean} isPreformatted true if white-space in text nodes should
         *    be considered significant.
         * @return {Object} source code and the text nodes in which they occur.
         */
        function extractSourceSpans(node, isPreformatted) {
          var nocode = /(?:^|\s)nocode(?:\s|$)/;
        
          var chunks = [];
          var length = 0;
          var spans = [];
          var k = 0;
        
          function walk(node) {
            var type = node.nodeType;
            if (type == 1) {  // Element
              if (nocode.test(node.className)) { return; }
              for (var child = node.firstChild; child; child = child.nextSibling) {
                walk(child);
              }
              var nodeName = node.nodeName.toLowerCase();
              if ('br' === nodeName || 'li' === nodeName) {
                chunks[k] = '
  ';
                spans[k << 1] = length++;
                spans[(k++ << 1) | 1] = node;
              }
            } else if (type == 3 || type == 4) {  // Text
              var text = node.nodeValue;
              if (text.length) {
                if (!isPreformatted) {
                  text = text.replace(/[ \t\r
  ]+/g, ' ');
                } else {
                  text = text.replace(/\r
  ?/g, '
  ');  // Normalize newlines.
                }
                // TODO: handle tabs here?
                chunks[k] = text;
                spans[k << 1] = length;
                length += text.length;
                spans[(k++ << 1) | 1] = node;
              }
            }
          }
        
          walk(node);
        
          return {
            sourceCode: chunks.join('').replace(/
  $/, ''),
            spans: spans
          };
        }
      
        /**
         * Apply the given language handler to sourceCode and add the resulting
         * decorations to out.
         * @param {number} basePos the index of sourceCode within the chunk of source
         *    whose decorations are already present on out.
         */
        function appendDecorations(basePos, sourceCode, langHandler, out) {
          if (!sourceCode) { return; }
          var job = {
            sourceCode: sourceCode,
            basePos: basePos
          };
          langHandler(job);
          out.push.apply(out, job.decorations);
        }
      
        var notWs = /\S/;
      
        /**
         * Given an element, if it contains only one child element and any text nodes
         * it contains contain only space characters, return the sole child element.
         * Otherwise returns undefined.
         * <p>
         * This is meant to return the CODE element in {@code <pre><code ...>} when
         * there is a single child element that contains all the non-space textual
         * content, but not to return anything where there are multiple child elements
         * as in {@code <pre><code>...</code><code>...</code></pre>} or when there
         * is textual content.
         */
        function childContentWrapper(element) {
          var wrapper = undefined;
          for (var c = element.firstChild; c; c = c.nextSibling) {
            var type = c.nodeType;
            wrapper = (type === 1)  // Element Node
                ? (wrapper ? element : c)
                : (type === 3)  // Text Node
                ? (notWs.test(c.nodeValue) ? element : wrapper)
                : wrapper;
          }
          return wrapper === element ? undefined : wrapper;
        }
      
        /** Given triples of [style, pattern, context] returns a lexing function,
          * The lexing function interprets the patterns to find token boundaries and
          * returns a decoration list of the form
          * [index_0, style_0, index_1, style_1, ..., index_n, style_n]
          * where index_n is an index into the sourceCode, and style_n is a style
          * constant like PR_PLAIN.  index_n-1 <= index_n, and style_n-1 applies to
          * all characters in sourceCode[index_n-1:index_n].
          *
          * The stylePatterns is a list whose elements have the form
          * [style : string, pattern : RegExp, DEPRECATED, shortcut : string].
          *
          * Style is a style constant like PR_PLAIN, or can be a string of the
          * form 'lang-FOO', where FOO is a language extension describing the
          * language of the portion of the token in $1 after pattern executes.
          * E.g., if style is 'lang-lisp', and group 1 contains the text
          * '(hello (world))', then that portion of the token will be passed to the
          * registered lisp handler for formatting.
          * The text before and after group 1 will be restyled using this decorator
          * so decorators should take care that this doesn't result in infinite
          * recursion.  For example, the HTML lexer rule for SCRIPT elements looks
          * something like ['lang-js', /<[s]cript>(.+?)<\/script>/].  This may match
          * '<script>foo()<\/script>', which would cause the current decorator to
          * be called with '<script>' which would not match the same rule since
          * group 1 must not be empty, so it would be instead styled as PR_TAG by
          * the generic tag rule.  The handler registered for the 'js' extension would
          * then be called with 'foo()', and finally, the current decorator would
          * be called with '<\/script>' which would not match the original rule and
          * so the generic tag rule would identify it as a tag.
          *
          * Pattern must only match prefixes, and if it matches a prefix, then that
          * match is considered a token with the same style.
          *
          * Context is applied to the last non-whitespace, non-comment token
          * recognized.
          *
          * Shortcut is an optional string of characters, any of which, if the first
          * character, gurantee that this pattern and only this pattern matches.
          *
          * @param {Array} shortcutStylePatterns patterns that always start with
          *   a known character.  Must have a shortcut string.
          * @param {Array} fallthroughStylePatterns patterns that will be tried in
          *   order if the shortcut ones fail.  May have shortcuts.
          *
          * @return {function (Object)} a
          *   function that takes source code and returns a list of decorations.
          */
        function createSimpleLexer(shortcutStylePatterns, fallthroughStylePatterns) {
          var shortcuts = {};
          var tokenizer;
          (function () {
            var allPatterns = shortcutStylePatterns.concat(fallthroughStylePatterns);
            var allRegexs = [];
            var regexKeys = {};
            for (var i = 0, n = allPatterns.length; i < n; ++i) {
              var patternParts = allPatterns[i];
              var shortcutChars = patternParts[3];
              if (shortcutChars) {
                for (var c = shortcutChars.length; --c >= 0;) {
                  shortcuts[shortcutChars.charAt(c)] = patternParts;
                }
              }
              var regex = patternParts[1];
              var k = '' + regex;
              if (!regexKeys.hasOwnProperty(k)) {
                allRegexs.push(regex);
                regexKeys[k] = null;
              }
            }
            allRegexs.push(/[\0-\uffff]/);
            tokenizer = combinePrefixPatterns(allRegexs);
          })();
      
          var nPatterns = fallthroughStylePatterns.length;
      
          /**
           * Lexes job.sourceCode and produces an output array job.decorations of
           * style classes preceded by the position at which they start in
           * job.sourceCode in order.
           *
           * @param {Object} job an object like <pre>{
           *    sourceCode: {string} sourceText plain text,
           *    basePos: {int} position of job.sourceCode in the larger chunk of
           *        sourceCode.
           * }</pre>
           */
          var decorate = function (job) {
            var sourceCode = job.sourceCode, basePos = job.basePos;
            /** Even entries are positions in source in ascending order.  Odd enties
              * are style markers (e.g., PR_COMMENT) that run from that position until
              * the end.
              * @type {Array.<number|string>}
              */
            var decorations = [basePos, PR_PLAIN];
            var pos = 0;  // index into sourceCode
            var tokens = sourceCode.match(tokenizer) || [];
            var styleCache = {};
      
            for (var ti = 0, nTokens = tokens.length; ti < nTokens; ++ti) {
              var token = tokens[ti];
              var style = styleCache[token];
              var match = void 0;
      
              var isEmbedded;
              if (typeof style === 'string') {
                isEmbedded = false;
              } else {
                var patternParts = shortcuts[token.charAt(0)];
                if (patternParts) {
                  match = token.match(patternParts[1]);
                  style = patternParts[0];
                } else {
                  for (var i = 0; i < nPatterns; ++i) {
                    patternParts = fallthroughStylePatterns[i];
                    match = token.match(patternParts[1]);
                    if (match) {
                      style = patternParts[0];
                      break;
                    }
                  }
      
                  if (!match) {  // make sure that we make progress
                    style = PR_PLAIN;
                  }
                }
      
                isEmbedded = style.length >= 5 && 'lang-' === style.substring(0, 5);
                if (isEmbedded && !(match && typeof match[1] === 'string')) {
                  isEmbedded = false;
                  style = PR_SOURCE;
                }
      
                if (!isEmbedded) { styleCache[token] = style; }
              }
      
              var tokenStart = pos;
              pos += token.length;
      
              if (!isEmbedded) {
                decorations.push(basePos + tokenStart, style);
              } else {  // Treat group 1 as an embedded block of source code.
                var embeddedSource = match[1];
                var embeddedSourceStart = token.indexOf(embeddedSource);
                var embeddedSourceEnd = embeddedSourceStart + embeddedSource.length;
                if (match[2]) {
                  // If embeddedSource can be blank, then it would match at the
                  // beginning which would cause us to infinitely recurse on the
                  // entire token, so we catch the right context in match[2].
                  embeddedSourceEnd = token.length - match[2].length;
                  embeddedSourceStart = embeddedSourceEnd - embeddedSource.length;
                }
                var lang = style.substring(5);
                // Decorate the left of the embedded source
                appendDecorations(
                    basePos + tokenStart,
                    token.substring(0, embeddedSourceStart),
                    decorate, decorations);
                // Decorate the embedded source
                appendDecorations(
                    basePos + tokenStart + embeddedSourceStart,
                    embeddedSource,
                    langHandlerForExtension(lang, embeddedSource),
                    decorations);
                // Decorate the right of the embedded section
                appendDecorations(
                    basePos + tokenStart + embeddedSourceEnd,
                    token.substring(embeddedSourceEnd),
                    decorate, decorations);
              }
            }
            job.decorations = decorations;
          };
          return decorate;
        }
      
        /** returns a function that produces a list of decorations from source text.
          *
          * This code treats ", ', and ` as string delimiters, and \ as a string
          * escape.  It does not recognize perl's qq() style strings.
          * It has no special handling for double delimiter escapes as in basic, or
          * the tripled delimiters used in python, but should work on those regardless
          * although in those cases a single string literal may be broken up into
          * multiple adjacent string literals.
          *
          * It recognizes C, C++, and shell style comments.
          *
          * @param {Object} options a set of optional parameters.
          * @return {function (Object)} a function that examines the source code
          *     in the input job and builds the decoration list.
          */
        function sourceDecorator(options) {
          var shortcutStylePatterns = [], fallthroughStylePatterns = [];
          if (options['tripleQuotedStrings']) {
            // '''multi-line-string''', 'single-line-string', and double-quoted
            shortcutStylePatterns.push(
                [PR_STRING,  /^(?:\'\'\'(?:[^\'\\]|\\[\s\S]|\'{1,2}(?=[^\']))*(?:\'\'\'|$)|\"\"\"(?:[^\"\\]|\\[\s\S]|\"{1,2}(?=[^\"]))*(?:\"\"\"|$)|\'(?:[^\\\']|\\[\s\S])*(?:\'|$)|\"(?:[^\\\"]|\\[\s\S])*(?:\"|$))/,
                 null, '\'"']);
          } else if (options['multiLineStrings']) {
            // 'multi-line-string', "multi-line-string"
            shortcutStylePatterns.push(
                [PR_STRING,  /^(?:\'(?:[^\\\']|\\[\s\S])*(?:\'|$)|\"(?:[^\\\"]|\\[\s\S])*(?:\"|$)|\`(?:[^\\\`]|\\[\s\S])*(?:\`|$))/,
                 null, '\'"`']);
          } else {
            // 'single-line-string', "single-line-string"
            shortcutStylePatterns.push(
                [PR_STRING,
                 /^(?:\'(?:[^\\\'\r
  ]|\\.)*(?:\'|$)|\"(?:[^\\\"\r
  ]|\\.)*(?:\"|$))/,
                 null, '"\'']);
          }
          if (options['verbatimStrings']) {
            // verbatim-string-literal production from the C# grammar.  See issue 93.
            fallthroughStylePatterns.push(
                [PR_STRING, /^@\"(?:[^\"]|\"\")*(?:\"|$)/, null]);
          }
          var hc = options['hashComments'];
          if (hc) {
            if (options['cStyleComments']) {
              if (hc > 1) {  // multiline hash comments
                shortcutStylePatterns.push(
                    [PR_COMMENT, /^#(?:##(?:[^#]|#(?!##))*(?:###|$)|.*)/, null, '#']);
              } else {
                // Stop C preprocessor declarations at an unclosed open comment
                shortcutStylePatterns.push(
                    [PR_COMMENT, /^#(?:(?:define|e(?:l|nd)if|else|error|ifn?def|include|line|pragma|undef|warning)\b|[^\r
  ]*)/,
                     null, '#']);
              }
              // #include <stdio.h>
              fallthroughStylePatterns.push(
                  [PR_STRING,
                   /^<(?:(?:(?:\.\.\/)*|\/?)(?:[\w-]+(?:\/[\w-]+)+)?[\w-]+\.h(?:h|pp|\+\+)?|[a-z]\w*)>/,
                   null]);
            } else {
              shortcutStylePatterns.push([PR_COMMENT, /^#[^\r
  ]*/, null, '#']);
            }
          }
          if (options['cStyleComments']) {
            fallthroughStylePatterns.push([PR_COMMENT, /^\/\/[^\r
  ]*/, null]);
            fallthroughStylePatterns.push(
                [PR_COMMENT, /^\/\*[\s\S]*?(?:\*\/|$)/, null]);
          }
          var regexLiterals = options['regexLiterals'];
          if (regexLiterals) {
            /**
             * @const
             */
            var regexExcls = regexLiterals > 1
              ? ''  // Multiline regex literals
              : '
  \r';
            /**
             * @const
             */
            var regexAny = regexExcls ? '.' : '[\\S\\s]';
            /**
             * @const
             */
            var REGEX_LITERAL = (
                // A regular expression literal starts with a slash that is
                // not followed by * or / so that it is not confused with
                // comments.
                '/(?=[^/*' + regexExcls + '])'
                // and then contains any number of raw characters,
                + '(?:[^/\\x5B\\x5C' + regexExcls + ']'
                // escape sequences (\x5C),
                +    '|\\x5C' + regexAny
                // or non-nesting character sets (\x5B\x5D);
                +    '|\\x5B(?:[^\\x5C\\x5D' + regexExcls + ']'
                +             '|\\x5C' + regexAny + ')*(?:\\x5D|$))+'
                // finally closed by a /.
                + '/');
            fallthroughStylePatterns.push(
                ['lang-regex',
                 RegExp('^' + REGEXP_PRECEDER_PATTERN + '(' + REGEX_LITERAL + ')')
                 ]);
          }
      
          var types = options['types'];
          if (types) {
            fallthroughStylePatterns.push([PR_TYPE, types]);
          }
      
          var keywords = ("" + options['keywords']).replace(/^ | $/g, '');
          if (keywords.length) {
            fallthroughStylePatterns.push(
                [PR_KEYWORD,
                 new RegExp('^(?:' + keywords.replace(/[\s,]+/g, '|') + ')\\b'),
                 null]);
          }
      
          shortcutStylePatterns.push([PR_PLAIN,       /^\s+/, null, ' \r
  \t\xA0']);
      
          var punctuation =
            // The Bash man page says
      
            // A word is a sequence of characters considered as a single
            // unit by GRUB. Words are separated by metacharacters,
            // which are the following plus space, tab, and newline: { }
            // | & $ ; < >
            // ...
            
            // A word beginning with # causes that word and all remaining
            // characters on that line to be ignored.
      
            // which means that only a '#' after /(?:^|[{}|&$;<>\s])/ starts a
            // comment but empirically
            // $ echo {#}
            // {#}
            // $ echo \$#
            // $#
            // $ echo }#
            // }#
      
            // so /(?:^|[|&;<>\s])/ is more appropriate.
      
            // http://gcc.gnu.org/onlinedocs/gcc-2.95.3/cpp_1.html#SEC3
            // suggests that this definition is compatible with a
            // default mode that tries to use a single token definition
            // to recognize both bash/python style comments and C
            // preprocessor directives.
      
            // This definition of punctuation does not include # in the list of
            // follow-on exclusions, so # will not be broken before if preceeded
            // by a punctuation character.  We could try to exclude # after
            // [|&;<>] but that doesn't seem to cause many major problems.
            // If that does turn out to be a problem, we should change the below
            // when hc is truthy to include # in the run of punctuation characters
            // only when not followint [|&;<>].
            '^.[^\\s\\w.$@\'"`/\\\\]*';
          if (options['regexLiterals']) {
            punctuation += '(?!\s*\/)';
          }
      
          fallthroughStylePatterns.push(
              // TODO(mikesamuel): recognize non-latin letters and numerals in idents
              [PR_LITERAL,     /^@[a-z_$][a-z_$@0-9]*/i, null],
              [PR_TYPE,        /^(?:[@_]?[A-Z]+[a-z][A-Za-z_$@0-9]*|\w+_t\b)/, null],
              [PR_PLAIN,       /^[a-z_$][a-z_$@0-9]*/i, null],
              [PR_LITERAL,
               new RegExp(
                   '^(?:'
                   // A hex number
                   + '0x[a-f0-9]+'
                   // or an octal or decimal number,
                   + '|(?:\\d(?:_\\d+)*\\d*(?:\\.\\d*)?|\\.\\d\\+)'
                   // possibly in scientific notation
                   + '(?:e[+\\-]?\\d+)?'
                   + ')'
                   // with an optional modifier like UL for unsigned long
                   + '[a-z]*', 'i'),
               null, '0123456789'],
              // Don't treat escaped quotes in bash as starting strings.
              // See issue 144.
              [PR_PLAIN,       /^\\[\s\S]?/, null],
              [PR_PUNCTUATION, new RegExp(punctuation), null]);
      
          return createSimpleLexer(shortcutStylePatterns, fallthroughStylePatterns);
        }
      
        var decorateSource = sourceDecorator({
              'keywords': ALL_KEYWORDS,
              'hashComments': true,
              'cStyleComments': true,
              'multiLineStrings': true,
              'regexLiterals': true
            });
      
        /**
         * Given a DOM subtree, wraps it in a list, and puts each line into its own
         * list item.
         *
         * @param {Node} node modified in place.  Its content is pulled into an
         *     HTMLOListElement, and each line is moved into a separate list item.
         *     This requires cloning elements, so the input might not have unique
         *     IDs after numbering.
         * @param {boolean} isPreformatted true iff white-space in text nodes should
         *     be treated as significant.
         */
        function numberLines(node, opt_startLineNum, isPreformatted) {
          var nocode = /(?:^|\s)nocode(?:\s|$)/;
          var lineBreak = /\r
  ?|
  /;
        
          var document = node.ownerDocument;
        
          var li = document.createElement('li');
          while (node.firstChild) {
            li.appendChild(node.firstChild);
          }
          // An array of lines.  We split below, so this is initialized to one
          // un-split line.
          var listItems = [li];
        
          function walk(node) {
            var type = node.nodeType;
            if (type == 1 && !nocode.test(node.className)) {  // Element
              if ('br' === node.nodeName) {
                breakAfter(node);
                // Discard the <BR> since it is now flush against a </LI>.
                if (node.parentNode) {
                  node.parentNode.removeChild(node);
                }
              } else {
                for (var child = node.firstChild; child; child = child.nextSibling) {
                  walk(child);
                }
              }
            } else if ((type == 3 || type == 4) && isPreformatted) {  // Text
              var text = node.nodeValue;
              var match = text.match(lineBreak);
              if (match) {
                var firstLine = text.substring(0, match.index);
                node.nodeValue = firstLine;
                var tail = text.substring(match.index + match[0].length);
                if (tail) {
                  var parent = node.parentNode;
                  parent.insertBefore(
                    document.createTextNode(tail), node.nextSibling);
                }
                breakAfter(node);
                if (!firstLine) {
                  // Don't leave blank text nodes in the DOM.
                  node.parentNode.removeChild(node);
                }
              }
            }
          }
        
          // Split a line after the given node.
          function breakAfter(lineEndNode) {
            // If there's nothing to the right, then we can skip ending the line
            // here, and move root-wards since splitting just before an end-tag
            // would require us to create a bunch of empty copies.
            while (!lineEndNode.nextSibling) {
              lineEndNode = lineEndNode.parentNode;
              if (!lineEndNode) { return; }
            }
        
            function breakLeftOf(limit, copy) {
              // Clone shallowly if this node needs to be on both sides of the break.
              var rightSide = copy ? limit.cloneNode(false) : limit;
              var parent = limit.parentNode;
              if (parent) {
                // We clone the parent chain.
                // This helps us resurrect important styling elements that cross lines.
                // E.g. in <i>Foo<br>Bar</i>
                // should be rewritten to <li><i>Foo</i></li><li><i>Bar</i></li>.
                var parentClone = breakLeftOf(parent, 1);
                // Move the clone and everything to the right of the original
                // onto the cloned parent.
                var next = limit.nextSibling;
                parentClone.appendChild(rightSide);
                for (var sibling = next; sibling; sibling = next) {
                  next = sibling.nextSibling;
                  parentClone.appendChild(sibling);
                }
              }
              return rightSide;
            }
        
            var copiedListItem = breakLeftOf(lineEndNode.nextSibling, 0);
        
            // Walk the parent chain until we reach an unattached LI.
            for (var parent;
                 // Check nodeType since IE invents document fragments.
                 (parent = copiedListItem.parentNode) && parent.nodeType === 1;) {
              copiedListItem = parent;
            }
            // Put it on the list of lines for later processing.
            listItems.push(copiedListItem);
          }
        
          // Split lines while there are lines left to split.
          for (var i = 0;  // Number of lines that have been split so far.
               i < listItems.length;  // length updated by breakAfter calls.
               ++i) {
            walk(listItems[i]);
          }
        
          // Make sure numeric indices show correctly.
          if (opt_startLineNum === (opt_startLineNum|0)) {
            listItems[0].setAttribute('value', opt_startLineNum);
          }
        
          var ol = document.createElement('ol');
          ol.className = 'linenums';
          var offset = Math.max(0, ((opt_startLineNum - 1 /* zero index */)) | 0) || 0;
          for (var i = 0, n = listItems.length; i < n; ++i) {
            li = listItems[i];
            // Stick a class on the LIs so that stylesheets can
            // color odd/even rows, or any other row pattern that
            // is co-prime with 10.
            li.className = 'L' + ((i + offset) % 10);
            if (!li.firstChild) {
              li.appendChild(document.createTextNode('\xA0'));
            }
            ol.appendChild(li);
          }
        
          node.appendChild(ol);
        }    
        /**
         * Breaks {@code job.sourceCode} around style boundaries in
         * {@code job.decorations} and modifies {@code job.sourceNode} in place.
         * @param {Object} job like <pre>{
         *    sourceCode: {string} source as plain text,
         *    sourceNode: {HTMLElement} the element containing the source,
         *    spans: {Array.<number|Node>} alternating span start indices into source
         *       and the text node or element (e.g. {@code <BR>}) corresponding to that
         *       span.
         *    decorations: {Array.<number|string} an array of style classes preceded
         *       by the position at which they start in job.sourceCode in order
         * }</pre>
         * @private
         */
        function recombineTagsAndDecorations(job) {
          var isIE8OrEarlier = /\bMSIE\s(\d+)/.exec(navigator.userAgent);
          isIE8OrEarlier = isIE8OrEarlier && +isIE8OrEarlier[1] <= 8;
          var newlineRe = /
  /g;
        
          var source = job.sourceCode;
          var sourceLength = source.length;
          // Index into source after the last code-unit recombined.
          var sourceIndex = 0;
        
          var spans = job.spans;
          var nSpans = spans.length;
          // Index into spans after the last span which ends at or before sourceIndex.
          var spanIndex = 0;
        
          var decorations = job.decorations;
          var nDecorations = decorations.length;
          // Index into decorations after the last decoration which ends at or before
          // sourceIndex.
          var decorationIndex = 0;
        
          // Remove all zero-length decorations.
          decorations[nDecorations] = sourceLength;
          var decPos, i;
          for (i = decPos = 0; i < nDecorations;) {
            if (decorations[i] !== decorations[i + 2]) {
              decorations[decPos++] = decorations[i++];
              decorations[decPos++] = decorations[i++];
            } else {
              i += 2;
            }
          }
          nDecorations = decPos;
        
          // Simplify decorations.
          for (i = decPos = 0; i < nDecorations;) {
            var startPos = decorations[i];
            // Conflate all adjacent decorations that use the same style.
            var startDec = decorations[i + 1];
            var end = i + 2;
            while (end + 2 <= nDecorations && decorations[end + 1] === startDec) {
              end += 2;
            }
            decorations[decPos++] = startPos;
            decorations[decPos++] = startDec;
            i = end;
          }
        
          nDecorations = decorations.length = decPos;
        
          var sourceNode = job.sourceNode;
          var oldDisplay;
          if (sourceNode) {
            oldDisplay = sourceNode.style.display;
            sourceNode.style.display = 'none';
          }
          try {
            var decoration = null;
            while (spanIndex < nSpans) {
              var spanStart = spans[spanIndex];
              var spanEnd = spans[spanIndex + 2] || sourceLength;
        
              var decEnd = decorations[decorationIndex + 2] || sourceLength;
        
              var end = Math.min(spanEnd, decEnd);
        
              var textNode = spans[spanIndex + 1];
              var styledText;
              if (textNode.nodeType !== 1  // Don't muck with <BR>s or <LI>s
                  // Don't introduce spans around empty text nodes.
                  && (styledText = source.substring(sourceIndex, end))) {
                // This may seem bizarre, and it is.  Emitting LF on IE causes the
                // code to display with spaces instead of line breaks.
                // Emitting Windows standard issue linebreaks (CRLF) causes a blank
                // space to appear at the beginning of every line but the first.
                // Emitting an old Mac OS 9 line separator makes everything spiffy.
                if (isIE8OrEarlier) {
                  styledText = styledText.replace(newlineRe, '\r');
                }
                textNode.nodeValue = styledText;
                var document = textNode.ownerDocument;
                var span = document.createElement('span');
                span.className = decorations[decorationIndex + 1];
                var parentNode = textNode.parentNode;
                parentNode.replaceChild(span, textNode);
                span.appendChild(textNode);
                if (sourceIndex < spanEnd) {  // Split off a text node.
                  spans[spanIndex + 1] = textNode
                      // TODO: Possibly optimize by using '' if there's no flicker.
                      = document.createTextNode(source.substring(end, spanEnd));
                  parentNode.insertBefore(textNode, span.nextSibling);
                }
              }
        
              sourceIndex = end;
        
              if (sourceIndex >= spanEnd) {
                spanIndex += 2;
              }
              if (sourceIndex >= decEnd) {
                decorationIndex += 2;
              }
            }
          } finally {
            if (sourceNode) {
              sourceNode.style.display = oldDisplay;
            }
          }
        }
      
        /** Maps language-specific file extensions to handlers. */
        var langHandlerRegistry = {};
        /** Register a language handler for the given file extensions.
          * @param {function (Object)} handler a function from source code to a list
          *      of decorations.  Takes a single argument job which describes the
          *      state of the computation.   The single parameter has the form
          *      {@code {
          *        sourceCode: {string} as plain text.
          *        decorations: {Array.<number|string>} an array of style classes
          *                     preceded by the position at which they start in
          *                     job.sourceCode in order.
          *                     The language handler should assigned this field.
          *        basePos: {int} the position of source in the larger source chunk.
          *                 All positions in the output decorations array are relative
          *                 to the larger source chunk.
          *      } }
          * @param {Array.<string>} fileExtensions
          */
        function registerLangHandler(handler, fileExtensions) {
          for (var i = fileExtensions.length; --i >= 0;) {
            var ext = fileExtensions[i];
            if (!langHandlerRegistry.hasOwnProperty(ext)) {
              langHandlerRegistry[ext] = handler;
            } else if (win['console']) {
              console['warn']('cannot override language handler %s', ext);
            }
          }
        }
        function langHandlerForExtension(extension, source) {
          if (!(extension && langHandlerRegistry.hasOwnProperty(extension))) {
            // Treat it as markup if the first non whitespace character is a < and
            // the last non-whitespace character is a >.
            extension = /^\s*</.test(source)
                ? 'default-markup'
                : 'default-code';
          }
          return langHandlerRegistry[extension];
        }
        registerLangHandler(decorateSource, ['default-code']);
        registerLangHandler(
            createSimpleLexer(
                [],
                [
                 [PR_PLAIN,       /^[^<?]+/],
                 [PR_DECLARATION, /^<!\w[^>]*(?:>|$)/],
                 [PR_COMMENT,     /^<\!--[\s\S]*?(?:-\->|$)/],
                 // Unescaped content in an unknown language
                 ['lang-',        /^<\?([\s\S]+?)(?:\?>|$)/],
                 ['lang-',        /^<%([\s\S]+?)(?:%>|$)/],
                 [PR_PUNCTUATION, /^(?:<[%?]|[%?]>)/],
                 ['lang-',        /^<xmp\b[^>]*>([\s\S]+?)<\/xmp\b[^>]*>/i],
                 // Unescaped content in javascript.  (Or possibly vbscript).
                 ['lang-js',      /^<script\b[^>]*>([\s\S]*?)(<\/script\b[^>]*>)/i],
                 // Contains unescaped stylesheet content
                 ['lang-css',     /^<style\b[^>]*>([\s\S]*?)(<\/style\b[^>]*>)/i],
                 ['lang-in.tag',  /^(<\/?[a-z][^<>]*>)/i]
                ]),
            ['default-markup', 'htm', 'html', 'mxml', 'xhtml', 'xml', 'xsl']);
        registerLangHandler(
            createSimpleLexer(
                [
                 [PR_PLAIN,        /^[\s]+/, null, ' \t\r
  '],
                 [PR_ATTRIB_VALUE, /^(?:\"[^\"]*\"?|\'[^\']*\'?)/, null, '\"\'']
                 ],
                [
                 [PR_TAG,          /^^<\/?[a-z](?:[\w.:-]*\w)?|\/?>$/i],
                 [PR_ATTRIB_NAME,  /^(?!style[\s=]|on)[a-z](?:[\w:-]*\w)?/i],
                 ['lang-uq.val',   /^=\s*([^>\'\"\s]*(?:[^>\'\"\s\/]|\/(?=\s)))/],
                 [PR_PUNCTUATION,  /^[=<>\/]+/],
                 ['lang-js',       /^on\w+\s*=\s*\"([^\"]+)\"/i],
                 ['lang-js',       /^on\w+\s*=\s*\'([^\']+)\'/i],
                 ['lang-js',       /^on\w+\s*=\s*([^\"\'>\s]+)/i],
                 ['lang-css',      /^style\s*=\s*\"([^\"]+)\"/i],
                 ['lang-css',      /^style\s*=\s*\'([^\']+)\'/i],
                 ['lang-css',      /^style\s*=\s*([^\"\'>\s]+)/i]
                 ]),
            ['in.tag']);
        registerLangHandler(
            createSimpleLexer([], [[PR_ATTRIB_VALUE, /^[\s\S]+/]]), ['uq.val']);
        registerLangHandler(sourceDecorator({
                'keywords': CPP_KEYWORDS,
                'hashComments': true,
                'cStyleComments': true,
                'types': C_TYPES
              }), ['c', 'cc', 'cpp', 'cxx', 'cyc', 'm']);
        registerLangHandler(sourceDecorator({
                'keywords': 'null,true,false'
              }), ['json']);
        registerLangHandler(sourceDecorator({
                'keywords': CSHARP_KEYWORDS,
                'hashComments': true,
                'cStyleComments': true,
                'verbatimStrings': true,
                'types': C_TYPES
              }), ['cs']);
        registerLangHandler(sourceDecorator({
                'keywords': JAVA_KEYWORDS,
                'cStyleComments': true
              }), ['java']);
        registerLangHandler(sourceDecorator({
                'keywords': SH_KEYWORDS,
                'hashComments': true,
                'multiLineStrings': true
              }), ['bash', 'bsh', 'csh', 'sh']);
        registerLangHandler(sourceDecorator({
                'keywords': PYTHON_KEYWORDS,
                'hashComments': true,
                'multiLineStrings': true,
                'tripleQuotedStrings': true
              }), ['cv', 'py', 'python']);
        registerLangHandler(sourceDecorator({
                'keywords': PERL_KEYWORDS,
                'hashComments': true,
                'multiLineStrings': true,
                'regexLiterals': 2  // multiline regex literals
              }), ['perl', 'pl', 'pm']);
        registerLangHandler(sourceDecorator({
                'keywords': RUBY_KEYWORDS,
                'hashComments': true,
                'multiLineStrings': true,
                'regexLiterals': true
              }), ['rb', 'ruby']);
        registerLangHandler(sourceDecorator({
                'keywords': JSCRIPT_KEYWORDS,
                'cStyleComments': true,
                'regexLiterals': true
              }), ['javascript', 'js']);
        registerLangHandler(sourceDecorator({
                'keywords': COFFEE_KEYWORDS,
                'hashComments': 3,  // ### style block comments
                'cStyleComments': true,
                'multilineStrings': true,
                'tripleQuotedStrings': true,
                'regexLiterals': true
              }), ['coffee']);
        registerLangHandler(sourceDecorator({
                'keywords': RUST_KEYWORDS,
                'cStyleComments': true,
                'multilineStrings': true
              }), ['rc', 'rs', 'rust']);
        registerLangHandler(
            createSimpleLexer([], [[PR_STRING, /^[\s\S]+/]]), ['regex']);
      
        function applyDecorator(job) {
          var opt_langExtension = job.langExtension;
      
          try {
            // Extract tags, and convert the source code to plain text.
            var sourceAndSpans = extractSourceSpans(job.sourceNode, job.pre);
            /** Plain text. @type {string} */
            var source = sourceAndSpans.sourceCode;
            job.sourceCode = source;
            job.spans = sourceAndSpans.spans;
            job.basePos = 0;
      
            // Apply the appropriate language handler
            langHandlerForExtension(opt_langExtension, source)(job);
      
            // Integrate the decorations and tags back into the source code,
            // modifying the sourceNode in place.
            recombineTagsAndDecorations(job);
          } catch (e) {
            if (win['console']) {
              console['log'](e && e['stack'] || e);
            }
          }
        }
      
        /**
         * Pretty print a chunk of code.
         * @param sourceCodeHtml {string} The HTML to pretty print.
         * @param opt_langExtension {string} The language name to use.
         *     Typically, a filename extension like 'cpp' or 'java'.
         * @param opt_numberLines {number|boolean} True to number lines,
         *     or the 1-indexed number of the first line in sourceCodeHtml.
         */
        function $prettyPrintOne(sourceCodeHtml, opt_langExtension, opt_numberLines) {
          var container = document.createElement('div');
          // This could cause images to load and onload listeners to fire.
          // E.g. <img onerror="alert(1337)" src="nosuchimage.png">.
          // We assume that the inner HTML is from a trusted source.
          // The pre-tag is required for IE8 which strips newlines from innerHTML
          // when it is injected into a <pre> tag.
          // http://stackoverflow.com/questions/451486/pre-tag-loses-line-breaks-when-setting-innerhtml-in-ie
          // http://stackoverflow.com/questions/195363/inserting-a-newline-into-a-pre-tag-ie-javascript
          container.innerHTML = '<pre>' + sourceCodeHtml + '</pre>';
          container = container.firstChild;
          if (opt_numberLines) {
            numberLines(container, opt_numberLines, true);
          }
      
          var job = {
            langExtension: opt_langExtension,
            numberLines: opt_numberLines,
            sourceNode: container,
            pre: 1
          };
          applyDecorator(job);
          return container.innerHTML;
        }
      
         /**
          * Find all the {@code <pre>} and {@code <code>} tags in the DOM with
          * {@code class=prettyprint} and prettify them.
          *
          * @param {Function} opt_whenDone called when prettifying is done.
          * @param {HTMLElement|HTMLDocument} opt_root an element or document
          *   containing all the elements to pretty print.
          *   Defaults to {@code document.body}.
          */
        function $prettyPrint(opt_whenDone, opt_root) {
          var root = opt_root || document.body;
          var doc = root.ownerDocument || document;
          function byTagName(tn) { return root.getElementsByTagName(tn); }
          // fetch a list of nodes to rewrite
          var codeSegments = [byTagName('pre'), byTagName('code'), byTagName('xmp')];
          var elements = [];
          for (var i = 0; i < codeSegments.length; ++i) {
            for (var j = 0, n = codeSegments[i].length; j < n; ++j) {
              elements.push(codeSegments[i][j]);
            }
          }
          codeSegments = null;
      
          var clock = Date;
          if (!clock['now']) {
            clock = { 'now': function () { return +(new Date); } };
          }
      
          // The loop is broken into a series of continuations to make sure that we
          // don't make the browser unresponsive when rewriting a large page.
          var k = 0;
          var prettyPrintingJob;
      
          var langExtensionRe = /\blang(?:uage)?-([\w.]+)(?!\S)/;
          var prettyPrintRe = /\bprettyprint\b/;
          var prettyPrintedRe = /\bprettyprinted\b/;
          var preformattedTagNameRe = /pre|xmp/i;
          var codeRe = /^code$/i;
          var preCodeXmpRe = /^(?:pre|code|xmp)$/i;
          var EMPTY = {};
      
          function doWork() {
            var endTime = (win['PR_SHOULD_USE_CONTINUATION'] ?
                           clock['now']() + 250 /* ms */ :
                           Infinity);
            for (; k < elements.length && clock['now']() < endTime; k++) {
              var cs = elements[k];
      
              // Look for a preceding comment like
              // <?prettify lang="..." linenums="..."?>
              var attrs = EMPTY;
              {
                for (var preceder = cs; (preceder = preceder.previousSibling);) {
                  var nt = preceder.nodeType;
                  // <?foo?> is parsed by HTML 5 to a comment node (8)
                  // like <!--?foo?-->, but in XML is a processing instruction
                  var value = (nt === 7 || nt === 8) && preceder.nodeValue;
                  if (value
                      ? !/^\??prettify\b/.test(value)
                      : (nt !== 3 || /\S/.test(preceder.nodeValue))) {
                    // Skip over white-space text nodes but not others.
                    break;
                  }
                  if (value) {
                    attrs = {};
                    value.replace(
                        /\b(\w+)=([\w:.%+-]+)/g,
                      function (_, name, value) { attrs[name] = value; });
                    break;
                  }
                }
              }
      
              var className = cs.className;
              if ((attrs !== EMPTY || prettyPrintRe.test(className))
                  // Don't redo this if we've already done it.
                  // This allows recalling pretty print to just prettyprint elements
                  // that have been added to the page since last call.
                  && !prettyPrintedRe.test(className)) {
      
                // make sure this is not nested in an already prettified element
                var nested = false;
                for (var p = cs.parentNode; p; p = p.parentNode) {
                  var tn = p.tagName;
                  if (preCodeXmpRe.test(tn)
                      && p.className && prettyPrintRe.test(p.className)) {
                    nested = true;
                    break;
                  }
                }
                if (!nested) {
                  // Mark done.  If we fail to prettyprint for whatever reason,
                  // we shouldn't try again.
                  cs.className += ' prettyprinted';
      
                  // If the classes includes a language extensions, use it.
                  // Language extensions can be specified like
                  //     <pre class="prettyprint lang-cpp">
                  // the language extension "cpp" is used to find a language handler
                  // as passed to PR.registerLangHandler.
                  // HTML5 recommends that a language be specified using "language-"
                  // as the prefix instead.  Google Code Prettify supports both.
                  // http://dev.w3.org/html5/spec-author-view/the-code-element.html
                  var langExtension = attrs['lang'];
                  if (!langExtension) {
                    langExtension = className.match(langExtensionRe);
                    // Support <pre class="prettyprint"><code class="language-c">
                    var wrapper;
                    if (!langExtension && (wrapper = childContentWrapper(cs))
                        && codeRe.test(wrapper.tagName)) {
                      langExtension = wrapper.className.match(langExtensionRe);
                    }
      
                    if (langExtension) { langExtension = langExtension[1]; }
                  }
      
                  var preformatted;
                  if (preformattedTagNameRe.test(cs.tagName)) {
                    preformatted = 1;
                  } else {
                    var currentStyle = cs['currentStyle'];
                    var defaultView = doc.defaultView;
                    var whitespace = (
                        currentStyle
                        ? currentStyle['whiteSpace']
                        : (defaultView
                           && defaultView.getComputedStyle)
                        ? defaultView.getComputedStyle(cs, null)
                        .getPropertyValue('white-space')
                        : 0);
                    preformatted = whitespace
                        && 'pre' === whitespace.substring(0, 3);
                  }
      
                  // Look for a class like linenums or linenums:<n> where <n> is the
                  // 1-indexed number of the first line.
                  var lineNums = attrs['linenums'];
                  if (!(lineNums = lineNums === 'true' || +lineNums)) {
                    lineNums = className.match(/\blinenums\b(?::(\d+))?/);
                    lineNums =
                      lineNums
                      ? lineNums[1] && lineNums[1].length
                        ? +lineNums[1] : true
                      : false;
                  }
                  if (lineNums) { numberLines(cs, lineNums, preformatted); }
      
                  // do the pretty printing
                  prettyPrintingJob = {
                    langExtension: langExtension,
                    sourceNode: cs,
                    numberLines: lineNums,
                    pre: preformatted
                  };
                  applyDecorator(prettyPrintingJob);
                }
              }
            }
            if (k < elements.length) {
              // finish up in a continuation
              setTimeout(doWork, 250);
            } else if ('function' === typeof opt_whenDone) {
              opt_whenDone();
            }
          }
      
          doWork();
        }
      
        /**
         * Contains functions for creating and registering new language handlers.
         * @type {Object}
         */
        var PR = win['PR'] = {
              'createSimpleLexer': createSimpleLexer,
              'registerLangHandler': registerLangHandler,
              'sourceDecorator': sourceDecorator,
              'PR_ATTRIB_NAME': PR_ATTRIB_NAME,
              'PR_ATTRIB_VALUE': PR_ATTRIB_VALUE,
              'PR_COMMENT': PR_COMMENT,
              'PR_DECLARATION': PR_DECLARATION,
              'PR_KEYWORD': PR_KEYWORD,
              'PR_LITERAL': PR_LITERAL,
              'PR_NOCODE': PR_NOCODE,
              'PR_PLAIN': PR_PLAIN,
              'PR_PUNCTUATION': PR_PUNCTUATION,
              'PR_SOURCE': PR_SOURCE,
              'PR_STRING': PR_STRING,
              'PR_TAG': PR_TAG,
              'PR_TYPE': PR_TYPE,
              'prettyPrintOne':
                 IN_GLOBAL_SCOPE
                   ? (win['prettyPrintOne'] = $prettyPrintOne)
                   : (prettyPrintOne = $prettyPrintOne),
              'prettyPrint': prettyPrint =
                 IN_GLOBAL_SCOPE
                   ? (win['prettyPrint'] = $prettyPrint)
                   : (prettyPrint = $prettyPrint)
            };
      
        // Make PR available via the Asynchronous Module Definition (AMD) API.
        // Per https://github.com/amdjs/amdjs-api/wiki/AMD:
        // The Asynchronous Module Definition (AMD) API specifies a
        // mechanism for defining modules such that the module and its
        // dependencies can be asynchronously loaded.
        // ...
        // To allow a clear indicator that a global define function (as
        // needed for script src browser loading) conforms to the AMD API,
        // any global define function SHOULD have a property called "amd"
        // whose value is an object. This helps avoid conflict with any
        // other existing JavaScript code that could have defined a define()
        // function that does not conform to the AMD API.
        if (typeof define === "function" && define['amd']) {
          define("google-code-prettify", [], function () {
            return PR; 
          });
        }
      })();
      return prettyPrint;
    })();
  
    // If this script is deferred or async and the document is already
    // loaded we need to wait for language handlers to load before performing
    // any autorun.
    function onLangsLoaded() {
      if (autorun) {
        contentLoaded(
          function () {
            var n = callbacks.length;
            var callback = n ? function () {
              for (var i = 0; i < n; ++i) {
                (function (i) {
                   setTimeout(
                     function () {
                       win['exports'][callbacks[i]].apply(win, arguments);
                     }, 0);
                 })(i);
              }
            } : void 0;
            prettyPrint(callback);
          });
      }
    }
    checkPendingLanguages();
  
  }());