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Code Editor : prettify.js

// 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.
 *
 * 
 * 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.
 * 
 * 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.
 * 
 * Change log: 
 * 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.
 *
 * 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.
 *
 * 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.
 *
 * 
 * The HTML DOM structure:
 * <pre>
 * (Element "p"
 * (Element "b"
 * (Text "print ")) ; #1
 * (Text "'Hello '") ; #2
 * (Element "br") ; #3
 * (Text " + 'World';")) ; #4
 * </pre>
 * 
 * corresponds to the HTML
 * {@code print 'Hello ' + 'World';}.
 *
 * 
 * It will produce the output:
 * <pre>
 * {
 * sourceCode: "print 'Hello '\n + 'World';",
 * // 1 2
 * // 012345678901234 5678901234567
 * spans: [0, #1, 6, #2, 14, #3, 15, #4]
 * }
 * </pre>
 * 
 * where #1 is a reference to the {@code "print "} text node above, and so
 * on for the other text nodes.
 * 
 *
 * 
 * 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.
 * 
 *
 * @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.
 * 
 * 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 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 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 Foo Bar
 // should be rewritten to <li>Foo</li><li>Bar</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 }) 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 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;
  }

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
 };
})();

${this.title}

Code Editor : prettify.js