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