# HG changeset patch
# User Edho Arief <edho@myconan.net>
# Date 1349308384 -25200
# Node ID 33b47c2160a3352452210eeac14039acd0abe9ba
# Parent  85e9dc5df11c2f160ade7fa5b8011179ca120e95
Use mainline prettify instead of stealing from bootstrap.

diff -r 85e9dc5df11c -r 33b47c2160a3 app/assets/javascripts/application.js
--- a/app/assets/javascripts/application.js	Thu Oct 04 05:20:22 2012 +0700
+++ b/app/assets/javascripts/application.js	Thu Oct 04 06:53:04 2012 +0700
@@ -12,5 +12,5 @@
 //
 //= require jquery
 //= require jquery_ujs
-//= require bootstrap-prettify
+//= require prettify
 //= require_tree .
diff -r 85e9dc5df11c -r 33b47c2160a3 app/assets/javascripts/init.prettify.js
--- a/app/assets/javascripts/init.prettify.js	Thu Oct 04 05:20:22 2012 +0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,3 +0,0 @@
-$(document).ready(function() {
-  window.prettyPrint && prettyPrint()
-});
diff -r 85e9dc5df11c -r 33b47c2160a3 lib/assets/javascripts/bootstrap-prettify.js
--- a/lib/assets/javascripts/bootstrap-prettify.js	Thu Oct 04 05:20:22 2012 +0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,28 +0,0 @@
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diff -r 85e9dc5df11c -r 33b47c2160a3 lib/assets/javascripts/prettify.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/assets/javascripts/prettify.js	Thu Oct 04 06:53:04 2012 +0700
@@ -0,0 +1,1477 @@
+// 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 */
+
+/**
+ * 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;
+
+(function () {
+  // 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,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," +
+      "dynamic_cast,explicit,export,friend,inline,late_check," +
+      "mutable,namespace,nullptr,reinterpret_cast,static_assert,static_cast," +
+      "template,typeid,typename,using,virtual,where"];
+  var JAVA_KEYWORDS = [COMMON_KEYWORDS,
+      "abstract,boolean,byte,extends,final,finally,implements,import," +
+      "instanceof,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,interface,internal,into,is,lock," +
+      "object,out,override,orderby,params,partial,readonly,ref,sbyte,sealed," +
+      "stackalloc,string,select,uint,ulong,unchecked,unsafe,ushort,var"];
+  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," +
+      "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 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*)/;
+
+  // 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 a punctuation string.
+   * @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 a 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);
+      if (ch === '\\' || ch === '-' || ch === '[' || ch === ']') {
+        ch = '\\' + ch;
+      }
+      return 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 groups = [];
+      var ranges = [];
+      var inverse = charsetParts[0] === '^';
+      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.
+          groups.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 = [NaN, NaN];
+      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);
+        }
+      }
+  
+      var out = ['['];
+      if (inverse) { out.push('^'); }
+      out.push.apply(out, groups);
+      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/emd 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 && decimalValue <= groupIndex) {
+            capturedGroups[decimalValue] = -1;
+          }
+        }
+      }
+  
+      // 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] === undefined) {
+            parts[i] = '(?:';
+          }
+        } else if ('\\' === p.charAt(0)) {
+          var decimalValue = +p.substring(1);
+          if (decimalValue && decimalValue <= groupIndex) {
+            parts[i] = '\\' + capturedGroups[groupIndex];
+          }
+        }
+      }
+  
+      // Remove any prefix anchors so that the output will match anywhere.
+      // ^^ really does mean an anchored match though.
+      for (var i = 0, groupIndex = 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 '\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 source.
+   * </p>
+   *
+   * @param {Node} node an HTML DOM subtree containing source-code.
+   * @return {Object} source code and the text nodes in which they occur.
+   */
+  function extractSourceSpans(node) {
+    var nocode = /(?:^|\s)nocode(?:\s|$)/;
+  
+    var chunks = [];
+    var length = 0;
+    var spans = [];
+    var k = 0;
+  
+    var whitespace;
+    if (node.currentStyle) {
+      whitespace = node.currentStyle.whiteSpace;
+    } else if (window.getComputedStyle) {
+      whitespace = document.defaultView.getComputedStyle(node, null)
+          .getPropertyValue('white-space');
+    }
+    var isPreformatted = whitespace && 'pre' === whitespace.substring(0, 3);
+  
+    function walk(node) {
+      switch (node.nodeType) {
+        case 1:  // Element
+          if (nocode.test(node.className)) { return; }
+          for (var child = node.firstChild; child; child = child.nextSibling) {
+            walk(child);
+          }
+          var nodeName = node.nodeName;
+          if ('BR' === nodeName || 'LI' === nodeName) {
+            chunks[k] = '\n';
+            spans[k << 1] = length++;
+            spans[(k++ << 1) | 1] = node;
+          }
+          break;
+        case 3: case 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;
+          }
+          break;
+      }
+    }
+  
+    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 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\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|elif|else|endif|error|ifdef|include|ifndef|line|pragma|undef|warning)\b|[^\r\n]*)/,
+               null, '#']);
+        }
+        fallthroughStylePatterns.push(
+            [PR_STRING,
+             /^<(?:(?:(?:\.\.\/)*|\/?)(?:[\w-]+(?:\/[\w-]+)+)?[\w-]+\.h|[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]*?(?:\*\/|$)/, null]);
+    }
+    if (options['regexLiterals']) {
+      /**
+       * @const
+       */
+      var REGEX_LITERAL = (
+          // A regular expression literal starts with a slash that is
+          // not followed by * or / so that it is not confused with
+          // comments.
+          '/(?=[^/*])'
+          // and then contains any number of raw characters,
+          + '(?:[^/\\x5B\\x5C]'
+          // escape sequences (\x5C),
+          +    '|\\x5C[\\s\\S]'
+          // or non-nesting character sets (\x5B\x5D);
+          +    '|\\x5B(?:[^\\x5C\\x5D]|\\x5C[\\s\\S])*(?:\\x5D|$))+'
+          // finally closed by a /.
+          + '/');
+      fallthroughStylePatterns.push(
+          ['lang-regex',
+           new RegExp('^' + REGEXP_PRECEDER_PATTERN + '(' + REGEX_LITERAL + ')')
+           ]);
+    }
+
+    var types = options['types'];
+    if (types) {
+      fallthroughStylePatterns.push([PR_TYPE, types]);
+    }
+
+    var keywords = ("" + options['keywords']).replace(/^ | $/g, '');
+    if (keywords.length) {
+      fallthroughStylePatterns.push(
+          [PR_KEYWORD,
+           new RegExp('^(?:' + keywords.replace(/[\s,]+/g, '|') + ')\\b'),
+           null]);
+    }
+
+    shortcutStylePatterns.push([PR_PLAIN,       /^\s+/, null, ' \r\n\t\xA0']);
+    fallthroughStylePatterns.push(
+        // TODO(mikesamuel): recognize non-latin letters and numerals in idents
+        [PR_LITERAL,     /^@[a-z_$][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, /^.[^\s\w\.$@\'\"\`\/\#\\]*/, null]);
+
+    return createSimpleLexer(shortcutStylePatterns, fallthroughStylePatterns);
+  }
+
+  var decorateSource = sourceDecorator({
+        'keywords': ALL_KEYWORDS,
+        'hashComments': true,
+        'cStyleComments': true,
+        'multiLineStrings': true,
+        'regexLiterals': true
+      });
+
+  /**
+   * Given a DOM subtree, wraps it in a list, and puts each line into its own
+   * list item.
+   *
+   * @param {Node} node modified in place.  Its content is pulled into an
+   *     HTMLOListElement, and each line is moved into a separate list item.
+   *     This requires cloning elements, so the input might not have unique
+   *     IDs after numbering.
+   */
+  function numberLines(node, opt_startLineNum) {
+    var nocode = /(?:^|\s)nocode(?:\s|$)/;
+    var lineBreak = /\r\n?|\n/;
+  
+    var document = node.ownerDocument;
+  
+    var whitespace;
+    if (node.currentStyle) {
+      whitespace = node.currentStyle.whiteSpace;
+    } else if (window.getComputedStyle) {
+      whitespace = document.defaultView.getComputedStyle(node, null)
+          .getPropertyValue('white-space');
+    }
+    // If it's preformatted, then we need to split lines on line breaks
+    // in addition to <BR>s.
+    var isPreformatted = whitespace && 'pre' === whitespace.substring(0, 3);
+  
+    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) {
+      switch (node.nodeType) {
+        case 1:  // Element
+          if (nocode.test(node.className)) { break; }
+          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);
+            }
+          }
+          break;
+        case 3: case 4:  // Text
+          if (isPreformatted) {
+            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);
+              }
+            }
+          }
+          break;
+      }
+    }
+  
+    // 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,
+   *    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 isIE = /\bMSIE\b/.test(navigator.userAgent);
+    var newlineRe = /\n/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 decoration = null;
+    while (spanIndex < nSpans) {
+      var spanStart = spans[spanIndex];
+      var spanEnd = spans[spanIndex + 2] || sourceLength;
+  
+      var decStart = decorations[decorationIndex];
+      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 (isIE) { 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;
+      }
+    }
+  }
+
+
+  /** 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 (window['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
+        }), ['bsh', 'csh', 'sh']);
+  registerLangHandler(sourceDecorator({
+          'keywords': PYTHON_KEYWORDS,
+          'hashComments': true,
+          'multiLineStrings': true,
+          'tripleQuotedStrings': true
+        }), ['cv', 'py']);
+  registerLangHandler(sourceDecorator({
+          'keywords': PERL_KEYWORDS,
+          'hashComments': true,
+          'multiLineStrings': true,
+          'regexLiterals': true
+        }), ['perl', 'pl', 'pm']);
+  registerLangHandler(sourceDecorator({
+          'keywords': RUBY_KEYWORDS,
+          'hashComments': true,
+          'multiLineStrings': true,
+          'regexLiterals': true
+        }), ['rb']);
+  registerLangHandler(sourceDecorator({
+          'keywords': JSCRIPT_KEYWORDS,
+          'cStyleComments': true,
+          'regexLiterals': true
+        }), ['js']);
+  registerLangHandler(sourceDecorator({
+          'keywords': COFFEE_KEYWORDS,
+          'hashComments': 3,  // ### style block comments
+          'cStyleComments': true,
+          'multilineStrings': true,
+          'tripleQuotedStrings': true,
+          'regexLiterals': true
+        }), ['coffee']);
+  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);
+      /** 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 ('console' in window) {
+        console['log'](e && e['stack'] ? e['stack'] : e);
+      }
+    }
+  }
+
+  /**
+   * @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('PRE');
+    // 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.
+    container.innerHTML = sourceCodeHtml;
+    if (opt_numberLines) {
+      numberLines(container, opt_numberLines);
+    }
+
+    var job = {
+      langExtension: opt_langExtension,
+      numberLines: opt_numberLines,
+      sourceNode: container
+    };
+    applyDecorator(job);
+    return container.innerHTML;
+  }
+
+  function prettyPrint(opt_whenDone) {
+    function byTagName(tn) { return document.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/;
+
+    function doWork() {
+      var endTime = (window['PR_SHOULD_USE_CONTINUATION'] ?
+                     clock['now']() + 250 /* ms */ :
+                     Infinity);
+      for (; k < elements.length && clock['now']() < endTime; k++) {
+        var cs = elements[k];
+        var className = cs.className;
+        if (className.indexOf('prettyprint') >= 0) {
+          // 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 = className.match(langExtensionRe);
+          // Support <pre class="prettyprint"><code class="language-c">
+          var wrapper;
+          if (!langExtension && (wrapper = childContentWrapper(cs))
+              && "CODE" === wrapper.tagName) {
+            langExtension = wrapper.className.match(langExtensionRe);
+          }
+
+          if (langExtension) {
+            langExtension = langExtension[1];
+          }
+
+          // make sure this is not nested in an already prettified element
+          var nested = false;
+          for (var p = cs.parentNode; p; p = p.parentNode) {
+            if ((p.tagName === 'pre' || p.tagName === 'code' ||
+                 p.tagName === 'xmp') &&
+                p.className && p.className.indexOf('prettyprint') >= 0) {
+              nested = true;
+              break;
+            }
+          }
+          if (!nested) {
+            // Look for a class like linenums or linenums:<n> where <n> is the
+            // 1-indexed number of the first line.
+            var lineNums = cs.className.match(/\blinenums\b(?::(\d+))?/);
+            lineNums = lineNums
+                  ? lineNums[1] && lineNums[1].length ? +lineNums[1] : true
+                  : false;
+            if (lineNums) { numberLines(cs, lineNums); }
+
+            // do the pretty printing
+            prettyPrintingJob = {
+              langExtension: langExtension,
+              sourceNode: cs,
+              numberLines: lineNums
+            };
+            applyDecorator(prettyPrintingJob);
+          }
+        }
+      }
+      if (k < elements.length) {
+        // finish up in a continuation
+        setTimeout(doWork, 250);
+      } else if (opt_whenDone) {
+        opt_whenDone();
+      }
+    }
+
+    doWork();
+  }
+
+   /**
+    * Find all the {@code <pre>} and {@code <code>} tags in the DOM with
+    * {@code class=prettyprint} and prettify them.
+    *
+    * @param {Function?} opt_whenDone if specified, called when the last entry
+    *     has been finished.
+    */
+  window['prettyPrintOne'] = prettyPrintOne;
+   /**
+    * Pretty print a chunk of code.
+    *
+    * @param {string} sourceCodeHtml code as html
+    * @return {string} code as html, but prettier
+    */
+  window['prettyPrint'] = prettyPrint;
+   /**
+    * Contains functions for creating and registering new language handlers.
+    * @type {Object}
+    */
+  window['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
+      };
+})();