text: // 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 src.  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 src 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 src 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 */
  
  /** @define {boolean} */
  var IN_GLOBAL_SCOPE = true;
  
  /**
   * 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 src.
     * @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 src 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 src 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 '\n  + '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 src.
     * </p>
     *
     * @param {Node} node an HTML DOM subtree containing src-code.
     * @param {boolean} isPreformatted true if white-space in text nodes should
     *    be considered significant.
     * @return {Object} src 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] = '\n';
            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\n]+/g, ' ');
            } else {
              text = text.replace(/\r\n?/g, '\n');  // 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(/\n$/, ''),
        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 src
     *    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 src 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 src 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 src 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 src
            appendDecorations(
                basePos + tokenStart,
                token.substring(0, embeddedSourceStart),
                decorate, decorations);
            // Decorate the embedded src
            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 src 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 src 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])*(?:\`|$))/,
             null, '\'"`']);
      } else {
        // 'single-line-string', "single-line-string"
        shortcutStylePatterns.push(
            [PR_STRING,
             /^(?:\'(?:[^\\\'\r\n]|\\.)*(?:\'|$)|\"(?:[^\\\"\r\n]|\\.)*(?:\"|$))/,
             null, '"\'']);
      }
      if (options['verbatimStrings']) {
        // verbatim-string-literal production from the C# grammar.  See issue 93.
        fallthroughStylePatterns.push(
            [PR_STRING, /^@\"(?:[^\"]|\"\")*(?:\"|$)/, null]);
      }
      var hc = options['hashComments'];
      if (hc) {
        if (options['cStyleComments']) {
          if (hc > 1) {  // multiline hash comments
            shortcutStylePatterns.push(
                [PR_COMMENT, /^#(?:##(?:[^#]|#(?!##))*(?:###|$)|.*)/, null, '#']);
          } else {
            // Stop C preprocessor declarations at an unclosed open comment
            shortcutStylePatterns.push(
                [PR_COMMENT, /^#(?:(?:define|e(?:l|nd)if|else|error|ifn?def|include|line|pragma|undef|warning)\b|[^\r\n]*)/,
                 null, '#']);
          }
          // #include <stdio.h>
          fallthroughStylePatterns.push(
              [PR_STRING,
               /^<(?:(?:(?:\.\.\/)*|\/?)(?:[\w-]+(?:\/[\w-]+)+)?[\w-]+\.h(?:h|pp|\+\+)?|[a-z]\w*)>/,
               null]);
        } else {
          shortcutStylePatterns.push([PR_COMMENT, /^#[^\r\n]*/, null, '#']);
        }
      }
      if (options['cStyleComments']) {
        fallthroughStylePatterns.push([PR_COMMENT, /^\/\/[^\r\n]*/, null]);
        fallthroughStylePatterns.push(
            [PR_COMMENT, /^\/\*[\s\S]*?(?:\*\/|$)/, null]);
      }
      var regexLiterals = options['regexLiterals'];
      if (regexLiterals) {
        /**
         * @const
         */
        var regexExcls = regexLiterals > 1
          ? ''  // Multiline regex literals
          : '\n\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\n\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\n?|\n/;
    
      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} src as plain text,
     *    sourceNode: {HTMLElement} the element containing the src,
     *    spans: {Array.<number|Node>} alternating span start indices into src
     *       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 = /\n/g;
    
      var source = job.sourceCode;
      var sourceLength = source.length;
      // Index into src 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 src 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 src in the larger src chunk.
      *                 All positions in the output decorations array are relative
      *                 to the larger src 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\n'],
             [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 src 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 src 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 src.
      // 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; 
      });
    }
  })();
  