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The JWebSwing implementation for Source Code Prettify
// 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
* README
* 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:
* - include this source file in an html page via
* {@code }
*
- define style rules. See the example page for examples.
*
- mark the {@code
} and {@code } tags in your source with
* {@code class=prettyprint.}
* You can also use the (html deprecated) {@code } 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;
});
}
})();
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