// 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.
*
* 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 decent subset of Perl, but,
* because of commenting conventions, doesn't work on Smalltalk, Lisp-like, or
* CAML-like languages.
*
* If there's a language not mentioned here, then I don't know it, and don't
* know whether it works. If it has a C-like, Bash-like, or XML-like syntax
* then it should work passably.
*
* Usage:
* 1) include this source file in an html page via
*
* 2) define style rules. See the example page for examples.
* 3) mark the and tags in your source with class=prettyprint.
* You can also use the (html deprecated) <![CDATA[ tag, but the pretty printer
* needs to do more substantial DOM manipulations to support that, so some
* css styles may not be preserved.
* 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.
*
* Change log:
* cbeust, 2006/08/22
* Java annotations (start with "@") are now captured as literals ("lit")
*/
var PR_keywords = {};
/** initialize the keyword list for our target languages. */
(function () {
var CPP_KEYWORDS = "abstract bool break case catch char class const " +
"const_cast continue default delete deprecated dllexport dllimport do " +
"double dynamic_cast else enum explicit extern false float for friend " +
"goto if inline int long mutable naked namespace new noinline noreturn " +
"nothrow novtable operator private property protected public register " +
"reinterpret_cast return selectany short signed sizeof static " +
"static_cast struct switch template this thread throw true try typedef " +
"typeid typename union unsigned using declaration, directive uuid " +
"virtual void volatile while typeof";
var CSHARP_KEYWORDS = "as base by byte checked decimal delegate descending " +
"event finally fixed foreach from group implicit in interface internal " +
"into is lock null object out override orderby params readonly ref sbyte " +
"sealed stackalloc string select uint ulong unchecked unsafe ushort var";
var JAVA_KEYWORDS = "package synchronized boolean implements import throws " +
"instanceof transient extends final strictfp native super";
var JSCRIPT_KEYWORDS = "debugger export function with NaN Infinity";
var PERL_KEYWORDS = "require sub unless until use elsif BEGIN END";
var PYTHON_KEYWORDS = "and assert def del elif except exec global lambda " +
"not or pass print raise yield False True None";
var RUBY_KEYWORDS = "then end begin rescue ensure module when undef next " +
"redo retry alias defined";
var SH_KEYWORDS = "done fi";
var KEYWORDS = [CPP_KEYWORDS, CSHARP_KEYWORDS, JAVA_KEYWORDS,
JSCRIPT_KEYWORDS, PERL_KEYWORDS, PYTHON_KEYWORDS,
RUBY_KEYWORDS, SH_KEYWORDS];
for (var k = 0; k < KEYWORDS.length; k++) {
var kw = KEYWORDS[k].split(' ');
for (var i = 0; i < kw.length; i++) {
if (kw[i]) { PR_keywords[kw[i]] = true; }
}
}
}).call(this);
// token style names. correspond to css classes
/** token style for a string literal */
var PR_STRING = 'str';
/** token style for a keyword */
var PR_KEYWORD = 'kwd';
/** token style for a comment */
var PR_COMMENT = 'com';
/** token style for a type */
var PR_TYPE = 'typ';
/** token style for a literal value. e.g. 1, null, true. */
var PR_LITERAL = 'lit';
/** token style for a punctuation string. */
var PR_PUNCTUATION = 'pun';
/** token style for a punctuation string. */
var PR_PLAIN = 'pln';
/** token style for an sgml tag. */
var PR_TAG = 'tag';
/** token style for a markup declaration such as a DOCTYPE. */
var PR_DECLARATION = 'dec';
/** token style for embedded source. */
var PR_SOURCE = 'src';
/** token style for an sgml attribute name. */
var PR_ATTRIB_NAME = 'atn';
/** token style for an sgml attribute value. */
var PR_ATTRIB_VALUE = 'atv';
/** the number of characters between tab columns */
var PR_TAB_WIDTH = 8;
function PR_isWordChar(ch) {
return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z');
}
function PR_isIE6() {
var isIE6 = navigator && navigator.userAgent
&& /\bMSIE 6\./.test(navigator.userAgent);
PR_isIE6 = function () { return isIE6; }
return isIE6;
}
/** Splice one array into another.
* Like the python <code>
* container[containerPosition:containerPosition + countReplaced] = inserted
* </code>
* @param {Array} inserted
* @param {Array} container modified in place
* @param {Number} containerPosition
* @param {Number} countReplaced
*/
function PR_spliceArrayInto(
inserted, container, containerPosition, countReplaced) {
inserted.unshift(containerPosition, countReplaced || 0);
try {
container.splice.apply(container, inserted);
} finally {
inserted.splice(0, 2);
}
}
/** a set of tokens that can precede a regular expression literal in javascript.
* 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.
* @private
*/
var REGEXP_PRECEDER_PATTERN = (function () {
var preceders = [
"!", "!=", "!==", "#", "%", "%=", "&", "&&", "&&=",
"&=", "(", "*", "*=", /* "+", */ "+=", ",", /* "-", */ "-=",
"->", /*".", "..", "...", handled below */ "/", "/=", ":", "::", ";",
"<", "<<", "<<=", "<=", "=", "==", "===", ">",
">=", ">>", ">>=", ">>>", ">>>=", "?", "@", "[",
"^", "^=", "^^", "^^=", "{", "|", "|=", "||",
"||=", "~", "break", "case", "continue", "delete",
"do", "else", "finally", "instanceof",
"return", "throw", "try", "typeof"
];
var pattern = '(?:' +
'(?:(?:^|[^0-9\.])\\.{1,3})|' + // a dot that's not part of a number
'(?:(?:^|[^\\+])\\+)|' + // allow + but not ++
'(?:(?:^|[^\\-])-)' // allow - but not --
;
for (var i = 0; i < preceders.length; ++i) {
var preceder = preceders[i];
if (PR_isWordChar(preceder.charAt(0))) {
pattern += '|\\b' + preceder;
} else {
pattern += '|' + preceder.replace(/([^=<>:&])/g, '\\$1');
}
}
pattern += '|^)\\s*$'; // matches at end, and matches empty string
return new RegExp(pattern);
// 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.
})();
// Define regexps here so that the interpreter doesn't have to create an object
// each time the function containing them is called.
// The language spec requires a new object created even if you don't access the
// $1 members.
var pr_amp = /&/g;
var pr_lt = /</g;
var pr_gt = />/g;
var pr_quot = /\"/g;
/** like textToHtml but escapes double quotes to be attribute safe. */
function PR_attribToHtml(str) {
return str.replace(pr_amp, '&')
.replace(pr_lt, '<')
.replace(pr_gt, '>')
.replace(pr_quot, '"');
}
/** escapest html special characters to html. */
function PR_textToHtml(str) {
return str.replace(pr_amp, '&')
.replace(pr_lt, '<')
.replace(pr_gt, '>');
}
var pr_ltEnt = /</g;
var pr_gtEnt = />/g;
var pr_aposEnt = /'/g;
var pr_quotEnt = /"/g;
var pr_ampEnt = /&/g;
/** unescapes html to plain text. */
function PR_htmlToText(html) {
var pos = html.indexOf('&');
if (pos < 0) { return html; }
// Handle numeric entities specially. We can't use functional substitution
// since that doesn't work in older versions of Safari.
// These should be rare since most browsers convert them to normal chars.
for (--pos; (pos = html.indexOf('&#', pos + 1)) >= 0;) {
var end = html.indexOf(';', pos);
if (end >= 0) {
var num = html.substring(pos + 3, end);
var radix = 10;
if (num && num.charAt(0) == 'x') {
num = num.substring(1);
radix = 16;
}
var codePoint = parseInt(num, radix);
if (!isNaN(codePoint)) {
html = (html.substring(0, pos) + String.fromCharCode(codePoint) +
html.substring(end + 1));
}
}
}
return html.replace(pr_ltEnt, '<')
.replace(pr_gtEnt, '>')
.replace(pr_aposEnt, "'")
.replace(pr_quotEnt, '"')
.replace(pr_ampEnt, '&');
}
/** is the given node's innerHTML normally unescaped? */
function PR_isRawContent(node) {
return 'XMP' == node.tagName;
}
var PR_innerHtmlWorks = null;
function PR_getInnerHtml(node) {
// inner html is hopelessly broken in Safari 2.0.4 when the content is
// an html description of well formed XML and the containing tag is a PRE
// tag, so we detect that case and emulate innerHTML.
if (null === PR_innerHtmlWorks) {
var testNode = document.createElement('PRE');
testNode.appendChild(
document.createTextNode('<!DOCTYPE foo PUBLIC "foo bar">\n<foo />'));
PR_innerHtmlWorks = !/</.test(testNode.innerHTML);
}
if (PR_innerHtmlWorks) {
var content = node.innerHTML;
// XMP tags contain unescaped entities so require special handling.
if (PR_isRawContent(node)) {
content = PR_textToHtml(content);
}
return content;
}
var out = [];
for (var child = node.firstChild; child; child = child.nextSibling) {
PR_normalizedHtml(child, out);
}
return out.join('');
}
/** walks the DOM returning a properly escaped version of innerHTML.
*/
function PR_normalizedHtml(node, out) {
switch (node.nodeType) {
case 1: // an element
var name = node.tagName.toLowerCase();
out.push('\074', name);
for (var i = 0; i < node.attributes.length; ++i) {
var attr = node.attributes[i];
if (!attr.specified) { continue; }
out.push(' ');
PR_normalizedHtml(attr, out);
}
out.push('>');
for (var child = node.firstChild; child; child = child.nextSibling) {
PR_normalizedHtml(child, out);
}
if (node.firstChild || !/^(?:br|link|img)$/.test(name)) {
out.push('<\/', name, '>');
}
break;
case 2: // an attribute
out.push(node.name.toLowerCase(), '="', PR_attribToHtml(node.value), '"');
break;
case 3: case 4: // text
out.push(PR_textToHtml(node.nodeValue));
break;
}
}
/** returns a function that expand tabs to spaces. This function can be fed
* successive chunks of text, and will maintain its own internal state to
* keep track of how tabs are expanded.
* @return {function (plainText : String) : String } a function that takes
* plain text and return the text with tabs expanded.
* @private
*/
function PR_tabExpander(tabWidth) {
var SPACES = ' ';
var charInLine = 0;
return function (plainText) {
// walk over each character looking for tabs and newlines.
// On tabs, expand them. On newlines, reset charInLine.
// Otherwise increment charInLine
var out = null;
var pos = 0;
for (var i = 0, n = plainText.length; i < n; ++i) {
var ch = plainText.charAt(i);
switch (ch) {
case '\t':
if (!out) { out = []; }
out.push(plainText.substring(pos, i));
// calculate how much space we need in front of this part
// nSpaces is the amount of padding -- the number of spaces needed to
// move us to the next column, where columns occur at factors of
// tabWidth.
var nSpaces = tabWidth - (charInLine % tabWidth);
charInLine += nSpaces;
for (; nSpaces >= 0; nSpaces -= SPACES.length) {
out.push(SPACES.substring(0, nSpaces));
}
pos = i + 1;
break;
case '\n':
charInLine = 0;
break;
default:
++charInLine;
}
}
if (!out) { return plainText; }
out.push(plainText.substring(pos));
return out.join('');
};
}
// The below pattern matches one of the following
// (1) /[^<]+/ : A run of characters other than '<'
// (2) /<!--.*?-->/: an HTML comment
// (3) /<!\[CDATA\[.*?\]\]>/: a cdata section
// (3) /<\/?[a-zA-Z][^>]*>/ : A probably tag that should not be highlighted
// (4) /</ : A '<' that does not begin a larger chunk. Treated as 1
var pr_chunkPattern =
/(?:[^<]+|<!--[\s\S]*?-->|<!\[CDATA\[([\s\S]*?)\]\]>|<\/?[a-zA-Z][^>]*>|<)/g;
var pr_commentPrefix = /^<!--/;
var pr_cdataPrefix = /^<\[CDATA\[/;
var pr_brPrefix = /^<br\b/i;
/** split markup into chunks of html tags (style null) and
* plain text (style {@link #PR_PLAIN}), converting tags which are significant
* for tokenization (<br>) into their textual equivalent.
*
* @param {String} s html where whitespace is considered significant.
* @return {Object} source code and extracted tags.
* @private
*/
function PR_extractTags(s) {
// since the pattern has the 'g' modifier and defines no capturing groups,
// this will return a list of all chunks which we then classify and wrap as
// PR_Tokens
var matches = s.match(pr_chunkPattern);
var sourceBuf = [];
var sourceBufLen = 0;
var extractedTags = [];
if (matches) {
for (var i = 0, n = matches.length; i < n; ++i) {
var match = matches[i];
if (match.length > 1 && match.charAt(0) === '<') {
if (pr_commentPrefix.test(match)) { continue; }
if (pr_cdataPrefix.test(match)) {
// strip CDATA prefix and suffix. Don't unescape since it's CDATA
sourceBuf.push(match.substring(9, match.length - 3));
sourceBufLen += match.length - 12;
} else if (pr_brPrefix.test(match)) {
// <br> tags are lexically significant so convert them to text.
// This is undone later.
// <br> tags are lexically significant
sourceBuf.push('\n');
sourceBufLen += 1;
} else {
extractedTags.push(sourceBufLen, match);
}
} else {
var literalText = PR_htmlToText(match);
sourceBuf.push(literalText);
sourceBufLen += literalText.length;
}
}
}
return { source: sourceBuf.join(''), tags: extractedTags };
}
/** 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, context : RegExp, shortcut : String].
&
* Style is a style constant like PR_PLAIN.
*
* Pattern must only match prefixes, and if it matches a prefix and context is
* null or matches the last non-comment token parsed, 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 (sourceCode : String) -> Array.<Number|String>} a function
* that takes source code and a list of decorations to append to.
*/
function PR_createSimpleLexer(shortcutStylePatterns,
fallthroughStylePatterns) {
var shortcuts = {};
(function () {
var allPatterns = shortcutStylePatterns.concat(fallthroughStylePatterns);
for (var i = allPatterns.length; --i >= 0;) {
var patternParts = allPatterns[i];
var shortcutChars = patternParts[3];
if (shortcutChars) {
for (var c = shortcutChars.length; --c >= 0;) {
shortcuts[shortcutChars.charAt(c)] = patternParts;
}
}
}
})();
var nPatterns = fallthroughStylePatterns.length;
return function (sourceCode, opt_basePos) {
opt_basePos = opt_basePos || 0;
var decorations = [opt_basePos, PR_PLAIN];
var lastToken = '';
var pos = 0; // index into sourceCode
var tail = sourceCode;
while (tail.length) {
var style;
var token = null;
var patternParts = shortcuts[tail.charAt(0)];
if (patternParts) {
var match = tail.match(patternParts[1]);
token = match[0];
style = patternParts[0];
} else {
for (var i = 0; i < nPatterns; ++i) {
patternParts = fallthroughStylePatterns[i];
var contextPattern = patternParts[2];
if (contextPattern && !contextPattern.test(lastToken)) {
// rule can't be used
continue;
}
var match = tail.match(patternParts[1]);
if (match) {
token = match[0];
style = patternParts[0];
break;
}
}
if (!token) { // make sure that we make progress
style = PR_PLAIN;
token = tail.substring(0, 1);
}
}
decorations.push(opt_basePos + pos, style);
pos += token.length;
tail = tail.substring(token.length);
if (style !== PR_COMMENT && /\S/.test(token)) { lastToken = token; }
}
return decorations;
};
}
var PR_C_STYLE_STRING_AND_COMMENT_LEXER = PR_createSimpleLexer([
[PR_STRING, /^\'(?:[^\\\']|\\[\s\S])*(?:\'|$)/, null, "'"],
[PR_STRING, /^\"(?:[^\\\"]|\\[\s\S])*(?:\"|$)/, null, '"'],
[PR_STRING, /^\`(?:[^\\\`]|\\[\s\S])*(?:\`|$)/, null, '`']
], [
[PR_PLAIN, /^(?:[^\'\"\`\/\#]+)/, null, ' \r\n'],
[PR_COMMENT, /^#[^\r\n]*/, null, '#'],
[PR_COMMENT, /^\/\/[^\r\n]*/, null],
[PR_STRING, /^\/(?:[^\\\*\/]|\\[\s\S])+(?:\/|$)/, REGEXP_PRECEDER_PATTERN],
[PR_COMMENT, /^\/\*[\s\S]*?(?:\*\/|$)/, null]
]);
/** splits the given string into comment, string, and "other" tokens.
* @param {String} sourceCode as plain text
* @return {Array.<Number|String>} a decoration list.
* @private
*/
function PR_splitStringAndCommentTokens(sourceCode) {
return PR_C_STYLE_STRING_AND_COMMENT_LEXER(sourceCode);
}
var PR_C_STYLE_LITERAL_IDENTIFIER_PUNC_RECOGNIZER = PR_createSimpleLexer([], [
[PR_PLAIN, /^\s+/, null, ' \r\n'],
// TODO(mikesamuel): recognize non-latin letters and numerals in identifiers
[PR_PLAIN, /^[a-z_$@][a-z_$@0-9]*/i, null],
// A hex number
[PR_LITERAL, /^0x[a-f0-9]+[a-z]/i, null],
// An octal or decimal number, possibly in scientific notation
[PR_LITERAL, /^(?:\d(?:_\d+)*\d*(?:\.\d*)?|\.\d+)(?:e[+-]?\d+)?[a-z]*/i,
null, '123456789'],
[PR_PUNCTUATION, /^[^\s\w\.$@]+/, null]
// Fallback will handle decimal points not adjacent to a digit
]);
/** splits plain text tokens into more specific tokens, and then tries to
* recognize keywords, and types.
* @private
*/
function PR_splitNonStringNonCommentTokens(source, decorations) {
for (var i = 0; i < decorations.length; i += 2) {
var style = decorations[i + 1];
if (style === PR_PLAIN) {
var start = decorations[i];
var end = i + 2 < decorations.length ? decorations[i + 2] : source.length;
var chunk = source.substring(start, end);
var subDecs = PR_C_STYLE_LITERAL_IDENTIFIER_PUNC_RECOGNIZER(chunk, start);
for (var j = 0, m = subDecs.length; j < m; j += 2) {
var subStyle = subDecs[j + 1];
if (subStyle === PR_PLAIN) {
var subStart = subDecs[j];
var subEnd = j + 2 < m ? subDecs[j + 2] : chunk.length;
var token = source.substring(subStart, subEnd);
if (token == '.') {
subDecs[j + 1] = PR_PUNCTUATION;
} else if (token in PR_keywords) {
subDecs[j + 1] = PR_KEYWORD;
} else if (/^@?[A-Z][A-Z$]*[a-z][A-Za-z$]*$/.test(token)) {
// classify types and annotations using Java's style conventions
subDecs[j + 1] = token.charAt(0) == '@' ? PR_LITERAL : PR_TYPE;
}
}
}
PR_spliceArrayInto(subDecs, decorations, i, 2);
i += subDecs.length - 2;
}
}
return decorations;
}
var PR_MARKUP_LEXER = PR_createSimpleLexer([], [
[PR_PLAIN, /^[^<]+/, null],
[PR_DECLARATION, /^<!\w[^>]*(?:>|$)/, null],
[PR_COMMENT, /^<!--[\s\S]*?(?:-->|$)/, null],
[PR_SOURCE, /^<\?[\s\S]*?(?:\?>|$)/, null],
[PR_SOURCE, /^<%[\s\S]*?(?:%>|$)/, null],
[PR_SOURCE,
// Tags whose content is not escaped, and which contain source code.
/^<(script|style|xmp)\b[^>]*>[\s\S]*?<\/\1\b[^>]*>/i, null],
[PR_TAG, /^<\/?\w[^<>]*>/, null]
]);
// Splits any of the source|style|xmp entries above into a start tag,
// source content, and end tag.
var PR_SOURCE_CHUNK_PARTS = /^(<[^>]*>)([\s\S]*)(<\/[^>]*>)$/;
/** split markup on tags, comments, application directives, and other top level
* constructs. Tags are returned as a single token - attributes are not yet
* broken out.
* @private
*/
function PR_tokenizeMarkup(source) {
var decorations = PR_MARKUP_LEXER(source);
for (var i = 0; i < decorations.length; i += 2) {
if (decorations[i + 1] === PR_SOURCE) {
var start = decorations[i];
var end = i + 2 < decorations.length ? decorations[i + 2] : source.length;
// Split out start and end script tags as actual tags, and leave the body
// with style SCRIPT.
var sourceChunk = source.substring(start, end);
var match = (sourceChunk.match(PR_SOURCE_CHUNK_PARTS)
//|| sourceChunk.match(/^(<[?%])([\s\S]*)([?%]>)$/)
);
if (match) {
decorations.splice(
i, 2,
start, PR_TAG, // the open chunk
start + match[1].length, PR_SOURCE,
start + match[1].length + (match[2] || '').length, PR_TAG);
}
}
}
return decorations;
}
var PR_TAG_LEXER = PR_createSimpleLexer([
[PR_ATTRIB_VALUE, /^\'[^\']*(?:\'|$)/, null, "'"],
[PR_ATTRIB_VALUE, /^\"[^\"]*(?:\"|$)/, null, '"'],
[PR_PUNCTUATION, /^[<>\/=]+/, null, '<>/=']
], [
[PR_TAG, /^[\w:-]+/, /^</],
[PR_ATTRIB_VALUE, /^[\w-]+/, /^=/],
[PR_ATTRIB_NAME, /^[\w:-]+/, null],
[PR_PLAIN, /^\s+/, null, ' \t\r\n']
]);
/** split tags attributes and their values out from the tag name, and
* recursively lex source chunks.
* @private
*/
function PR_splitTagAttributes(source, decorations) {
for (var i = 0; i < decorations.length; i += 2) {
var style = decorations[i + 1];
if (style === PR_TAG) {
var start = decorations[i];
var end = i + 2 < decorations.length ? decorations[i + 2] : source.length;
var chunk = source.substring(start, end);
var subDecorations = PR_TAG_LEXER(chunk, start);
PR_spliceArrayInto(subDecorations, decorations, i, 2);
i += subDecorations.length - 2;
}
}
return decorations;
}
/** identify regions of markup that are really source code, and recursivley
* lex them.
* @private
*/
function PR_splitSourceNodes(source, decorations) {
for (var i = 0; i < decorations.length; i += 2) {
var style = decorations[i + 1];
if (style == PR_SOURCE) {
// Recurse using the non-markup lexer
var start = decorations[i];
var end = i + 2 < decorations.length ? decorations[i + 2] : source.length;
var subDecorations = PR_decorateSource(source.substring(start, end));
for (var j = 0, m = subDecorations.length; j < m; j += 2) {
subDecorations[j] += start;
}
PR_spliceArrayInto(subDecorations, decorations, i, 2);
i += subDecorations.length - 2;
}
}
return decorations;
}
/** identify attribute values that really contain source code and recursively
* lex them.
* @private
*/
function PR_splitSourceAttributes(source, decorations) {
var nextValueIsSource = false;
for (var i = 0; i < decorations.length; i += 2) {
var style = decorations[i + 1];
if (style === PR_ATTRIB_NAME) {
var start = decorations[i];
var end = i + 2 < decorations.length ? decorations[i + 2] : source.length;
nextValueIsSource = /^on|^style$/i.test(source.substring(start, end));
} else if (style == PR_ATTRIB_VALUE) {
if (nextValueIsSource) {
var start = decorations[i];
var end
= i + 2 < decorations.length ? decorations[i + 2] : source.length;
var attribValue = source.substring(start, end);
var attribLen = attribValue.length;
var quoted =
(attribLen >= 2 && /^[\"\']/.test(attribValue) &&
attribValue.charAt(0) === attribValue.charAt(attribLen - 1));
var attribSource;
var attribSourceStart;
var attribSourceEnd;
if (quoted) {
attribSourceStart = start + 1;
attribSourceEnd = end - 1;
attribSource = attribValue;
} else {
attribSourceStart = start + 1;
attribSourceEnd = end - 1;
attribSource = attribValue.substring(1, attribValue.length - 1);
}
var attribSourceDecorations = PR_decorateSource(attribSource);
for (var j = 0, m = attribSourceDecorations.length; j < m; j += 2) {
attribSourceDecorations[j] += attribSourceStart;
}
if (quoted) {
attribSourceDecorations.push(attribSourceEnd, PR_ATTRIB_VALUE);
PR_spliceArrayInto(attribSourceDecorations, decorations, i + 2, 0);
} else {
PR_spliceArrayInto(attribSourceDecorations, decorations, i, 2);
}
}
nextValueIsSource = false;
}
}
return decorations;
}
/** returns a list of decorations, where even entries
*
* 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 tje 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 {String} sourceCode as plain text
* @return {Array.<String,Number>} a decoration list
*/
function PR_decorateSource(sourceCode) {
// Split into strings, comments, and other.
// We do this because strings and comments are easily recognizable and can
// contain stuff that looks like other tokens, so we want to mark those early
// so we don't recurse into them.
var decorations = PR_splitStringAndCommentTokens(sourceCode);
// Split non comment|string tokens on whitespace and word boundaries
decorations = PR_splitNonStringNonCommentTokens(sourceCode, decorations);
return decorations;
}
/** returns a decoration list given a string of markup.
*
* This code recognizes a number of constructs.
* <!-- ... --> comment
* <!\w ... > declaration
* <\w ... > tag
* </\w ... > tag
* <?...?> embedded source
* <%...%> embedded source
* &[#\w]...; entity
*
* It does not recognizes %foo; doctype entities from .
*
* It will recurse into any <style>, <script>, and on* attributes using
* PR_lexSource.
*/
function PR_decorateMarkup(sourceCode) {
// This function works as follows:
// 1) Start by splitting the markup into text and tag chunks
// Input: String s
// Output: List<PR_Token> where style in (PR_PLAIN, null)
// 2) Then split the text chunks further into comments, declarations,
// tags, etc.
// After each split, consider whether the token is the start of an
// embedded source section, i.e. is an open <script> tag. If it is,
// find the corresponding close token, and don't bother to lex in between.
// Input: List<String>
// Output: List<PR_Token> with style in (PR_TAG, PR_PLAIN, PR_SOURCE, null)
// 3) Finally go over each tag token and split out attribute names and values.
// Input: List<PR_Token>
// Output: List<PR_Token> where style in
// (PR_TAG, PR_PLAIN, PR_SOURCE, NAME, VALUE, null)
var decorations = PR_tokenizeMarkup(sourceCode);
decorations = PR_splitTagAttributes(sourceCode, decorations);
decorations = PR_splitSourceNodes(sourceCode, decorations);
decorations = PR_splitSourceAttributes(sourceCode, decorations);
return decorations;
}
/**
* @param {String} sourceText plain text
* @param {Array.<Number|String>} extractedTags chunks of raw html preceded by
* their position in sourceText in order.
* @param {Array.<Number|String> decorations style classes preceded by their
* position in sourceText in order.
* @return {String} html
* @private
*/
function PR_recombineTagsAndDecorations(
sourceText, extractedTags, decorations) {
var html = [];
var outputIdx = 0; // index past the last char in sourceText written to html
var openDecoration = null;
var currentDecoration = null;
var tagPos = 0; // index into extractedTags
var decPos = 0; // index into decorations
var tabExpander = PR_tabExpander(PR_TAB_WIDTH);
// A helper function that is responsible for opening sections of decoration
// and outputing properly escaped chunks of source
function emitTextUpTo(sourceIdx) {
if (sourceIdx > outputIdx) {
if (openDecoration && openDecoration !== currentDecoration) {
// Close the current decoration
html.push('</span>');
openDecoration = null;
}
if (!openDecoration && currentDecoration) {
openDecoration = currentDecoration;
html.push('<span class="', openDecoration, '">');
}
// This interacts badly with some wikis which introduces paragraph tags
// into pre blocks for some strange reason.
// It's necessary for IE though which seems to lose the preformattednes
// of <pre> tags when their innerHTML is assigned.
// http://stud3.tuwien.ac.at/~e0226430/innerHtmlQuirk.html
// and it serves to undo the conversion of <br>s to newlines done in
// chunkify.
var htmlChunk = PR_textToHtml(
tabExpander(sourceText.substring(outputIdx, sourceIdx)))
.replace(/(\r\n?|\n| ) /g, '$1 ')
.replace(/\r\n?|\n/g, '<br />');
html.push(htmlChunk);
outputIdx = sourceIdx;
}
}
while (true) {
// Determine if we're going to consume a tag this time around. Otherwise we
// consume a decoration or exit.
var outputTag;
if (tagPos < extractedTags.length) {
if (decPos < decorations.length) {
// Pick one giving preference to extractedTags since we shouldn't open
// a new style that we're going to have to immediately close in order
// to output a tag.
outputTag = extractedTags[tagPos] <= decorations[decPos];
} else {
outputTag = true;
}
} else {
outputTag = false;
}
// Consume either a decoration or a tag or exit.
if (outputTag) {
emitTextUpTo(extractedTags[tagPos]);
if (openDecoration) {
// Close the current decoration
html.push('</span>');
openDecoration = null;
}
html.push(extractedTags[tagPos + 1]);
tagPos += 2;
} else if (decPos < decorations.length) {
emitTextUpTo(decorations[decPos]);
currentDecoration = decorations[decPos + 1];
decPos += 2;
} else {
break;
}
}
emitTextUpTo(sourceText.length);
if (openDecoration) {
html.push('</span>');
}
return html.join('');
}
/** pretty print a chunk of code.
*
* @param {String} sourceCodeHtml code as html
* @return {String} code as html, but prettier
*/
function prettyPrintOne(sourceCodeHtml) {
try {
// Extract tags, and convert the source code to plain text.
var sourceAndExtractedTags = PR_extractTags(sourceCodeHtml);
/** Plain text. @type {String} */
var source = sourceAndExtractedTags.source;
/** Even entries are positions in source in ascending order. Odd entries
* are tags that were extracted at that position.
* @type {Array.<Number|String>}
*/
var extractedTags = sourceAndExtractedTags.tags;
// Pick a lexer and apply it.
/** Treat it as markup if the first non whitespace character is a < and the
* last non-whitespace character is a >.
* @type {Boolean}
*/
var isMarkup = /^\s*</.test(source) && />\s*$/.test(source);
/** Even entires 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 = isMarkup
? PR_decorateMarkup(source)
: PR_decorateSource(source);
// Integrate the decorations and tags back into the source code to produce
// a decorated html string.
return PR_recombineTagsAndDecorations(source, extractedTags, decorations);
} catch (e) {
if ('console' in window) {
console.log(e);
console.trace();
}
return sourceCodeHtml;
}
}
var PR_SHOULD_USE_CONTINUATION = true;
/** find all the < pre > and < code > tags in the DOM with class=prettyprint and
* prettify them.
* @param {Function} opt_whenDone if specified, called when the last entry
* has been finished.
*/
function prettyPrint(opt_whenDone) {
var isIE6 = PR_isIE6();
// fetch a list of nodes to rewrite
var codeSegments = [
document.getElementsByTagName('pre'),
document.getElementsByTagName('code'),
document.getElementsByTagName('xmp') ];
var elements = [];
for (var i = 0; i < codeSegments.length; ++i) {
for (var j = 0; j < codeSegments[i].length; ++j) {
elements.push(codeSegments[i][j]);
}
}
codeSegments = null;
// 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;
function doWork() {
var endTime = (PR_SHOULD_USE_CONTINUATION
? new Date().getTime() + 250
: Infinity);
for (; k < elements.length && new Date().getTime() < endTime; k++) {
var cs = elements[k];
if (cs.className && cs.className.indexOf('prettyprint') >= 0) {
// make sure this is not nested in an already prettified element
var nested = false;
for (var p = cs.parentNode; p != null; p = p.parentNode) {
if ((p.tagName == 'pre' || p.tagName == 'code' ||
p.tagName == 'xmp') &&
p.className && p.className.indexOf('prettyprint') >= 0) {
nested = true;
break;
}
}
if (!nested) {
// fetch the content as a snippet of properly escaped HTML.
// Firefox adds newlines at the end.
var content = PR_getInnerHtml(cs);
content = content.replace(/(?:\r\n?|\n)$/, '');
// do the pretty printing
var newContent = prettyPrintOne(content);
// push the prettified html back into the tag.
if (!PR_isRawContent(cs)) {
// just replace the old html with the new
cs.innerHTML = newContent;
} else {
// we need to change the tag to a <pre> since <xmp>s do not allow
// embedded tags such as the span tags used to attach styles to
// sections of source code.
var pre = document.createElement('PRE');
for (var i = 0; i < cs.attributes.length; ++i) {
var a = cs.attributes[i];
if (a.specified) {
pre.setAttribute(a.name, a.value);
}
}
pre.innerHTML = newContent;
// remove the old
cs.parentNode.replaceChild(pre, cs);
pre = cs;
}
// Replace <br>s with line-feeds so that copying and pasting works on
// IE 6.
// Doing this on other browsers breaks lots of stuff since \r\n is
// treated as two newlines on Firefox, and doing this also slows down
// rendering.
if (isIE6 && cs.tagName === 'PRE') {
var lineBreaks = cs.getElementsByTagName('br');
for (var i = lineBreaks.length; --i >= 0;) {
var lineBreak = lineBreaks[i];
lineBreak.parentNode.replaceChild(
document.createTextNode('\r\n'), lineBreak);
}
}
}
}
}
if (k < elements.length) {
// finish up in a continuation
setTimeout(doWork, 250);
} else if (opt_whenDone) {
opt_whenDone();
}
}
doWork();
}
]]>