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367 lines
11 KiB
JavaScript
367 lines
11 KiB
JavaScript
/*
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* HTML5 Parser By Sam Blowes
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*
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* Designed for HTML5 documents
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*
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* Original code by John Resig (ejohn.org)
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* http://ejohn.org/blog/pure-javascript-html-parser/
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* Original code by Erik Arvidsson, Mozilla Public License
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* http://erik.eae.net/simplehtmlparser/simplehtmlparser.js
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*
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* ----------------------------------------------------------------------------
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* License
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* ----------------------------------------------------------------------------
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*
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* This code is triple licensed using Apache Software License 2.0,
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* Mozilla Public License or GNU Public License
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*
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* ////////////////////////////////////////////////////////////////////////////
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy
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* of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* ////////////////////////////////////////////////////////////////////////////
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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* License for the specific language governing rights and limitations
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* under the License.
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*
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* The Original Code is Simple HTML Parser.
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*
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* The Initial Developer of the Original Code is Erik Arvidsson.
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* Portions created by Erik Arvidssson are Copyright (C) 2004. All Rights
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* Reserved.
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*
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* ////////////////////////////////////////////////////////////////////////////
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* ----------------------------------------------------------------------------
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* Usage
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* ----------------------------------------------------------------------------
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*
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* // Use like so:
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* HTMLParser(htmlString, {
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* start: function(tag, attrs, unary) {},
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* end: function(tag) {},
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* chars: function(text) {},
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* comment: function(text) {}
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* });
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*
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* // or to get an XML string:
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* HTMLtoXML(htmlString);
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*
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* // or to get an XML DOM Document
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* HTMLtoDOM(htmlString);
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*
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* // or to inject into an existing document/DOM node
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* HTMLtoDOM(htmlString, document);
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* HTMLtoDOM(htmlString, document.body);
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*
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*/
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(function () {
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// Regular Expressions for parsing tags and attributes
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var startTag = /^<([-A-Za-z0-9_]+)((?:\s+[a-zA-Z_:][-a-zA-Z0-9_:.]*(?:\s*=\s*(?:(?:"[^"]*")|(?:'[^']*')|[^>\s]+))?)*)\s*(\/?)>/,
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endTag = /^<\/([-A-Za-z0-9_]+)[^>]*>/,
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attr = /([a-zA-Z_:][-a-zA-Z0-9_:.]*)(?:\s*=\s*(?:(?:"((?:\\.|[^"])*)")|(?:'((?:\\.|[^'])*)')|([^>\s]+)))?/g;
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// Empty Elements - HTML 5
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var empty = makeMap("area,base,basefont,br,col,frame,hr,img,input,link,meta,param,embed,command,keygen,source,track,wbr");
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// Block Elements - HTML 5
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var block = makeMap("a,address,article,applet,aside,audio,blockquote,button,canvas,center,dd,del,dir,div,dl,dt,fieldset,figcaption,figure,footer,form,frameset,h1,h2,h3,h4,h5,h6,header,hgroup,hr,iframe,ins,isindex,li,map,menu,noframes,noscript,object,ol,output,p,pre,section,script,table,tbody,td,tfoot,th,thead,tr,ul,video");
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// Inline Elements - HTML 5
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var inline = makeMap("abbr,acronym,applet,b,basefont,bdo,big,br,button,cite,code,del,dfn,em,font,i,iframe,img,input,ins,kbd,label,map,object,q,s,samp,script,select,small,span,strike,strong,sub,sup,textarea,tt,u,var");
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// Elements that you can, intentionally, leave open
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// (and which close themselves)
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var closeSelf = makeMap("colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr");
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// Attributes that have their values filled in disabled="disabled"
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var fillAttrs = makeMap("checked,compact,declare,defer,disabled,ismap,multiple,nohref,noresize,noshade,nowrap,readonly,selected");
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// Special Elements (can contain anything)
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var special = makeMap("script,style");
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var HTMLParser = this.HTMLParser = function (html, handler) {
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var index, chars, match, stack = [], last = html;
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stack.last = function () {
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return this[this.length - 1];
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};
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while (html) {
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chars = true;
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// Make sure we're not in a script or style element
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if (!stack.last() || !special[stack.last()]) {
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// Comment
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if (html.indexOf("<!--") == 0) {
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index = html.indexOf("-->");
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if (index >= 0) {
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if (handler.comment)
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handler.comment(html.substring(4, index));
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html = html.substring(index + 3);
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chars = false;
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}
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// end tag
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} else if (html.indexOf("</") == 0) {
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match = html.match(endTag);
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if (match) {
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html = html.substring(match[0].length);
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match[0].replace(endTag, parseEndTag);
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chars = false;
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}
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// start tag
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} else if (html.indexOf("<") == 0) {
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match = html.match(startTag);
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if (match) {
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html = html.substring(match[0].length);
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match[0].replace(startTag, parseStartTag);
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chars = false;
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}
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}
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if (chars) {
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index = html.indexOf("<");
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var text = index < 0 ? html : html.substring(0, index);
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html = index < 0 ? "" : html.substring(index);
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if (handler.chars)
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handler.chars(text);
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}
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} else {
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html = html.replace(new RegExp("([\\s\\S]*?)<\/" + stack.last() + "[^>]*>"), function (all, text) {
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text = text.replace(/<!--([\s\S]*?)-->|<!\[CDATA\[([\s\S]*?)]]>/g, "$1$2");
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if (handler.chars)
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handler.chars(text);
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return "";
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});
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parseEndTag("", stack.last());
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}
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if (html == last)
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throw "Parse Error: " + html;
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last = html;
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}
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// Clean up any remaining tags
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parseEndTag();
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function parseStartTag(tag, tagName, rest, unary) {
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tagName = tagName.toLowerCase();
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if (block[tagName]) {
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while (stack.last() && inline[stack.last()]) {
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parseEndTag("", stack.last());
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}
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}
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if (closeSelf[tagName] && stack.last() == tagName) {
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parseEndTag("", tagName);
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}
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unary = empty[tagName] || !!unary;
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if (!unary)
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stack.push(tagName);
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if (handler.start) {
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var attrs = [];
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rest.replace(attr, function (match, name) {
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var value = arguments[2] ? arguments[2] :
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arguments[3] ? arguments[3] :
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arguments[4] ? arguments[4] :
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fillAttrs[name] ? name : "";
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attrs.push({
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name: name,
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value: value,
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escaped: value.replace(/(^|[^\\])"/g, '$1\\\"') //"
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});
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});
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if (handler.start)
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handler.start(tagName, attrs, unary);
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}
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}
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function parseEndTag(tag, tagName) {
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// If no tag name is provided, clean shop
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if (!tagName)
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var pos = 0;
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// Find the closest opened tag of the same type
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else
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for (var pos = stack.length - 1; pos >= 0; pos--)
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if (stack[pos] == tagName)
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break;
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if (pos >= 0) {
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// Close all the open elements, up the stack
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for (var i = stack.length - 1; i >= pos; i--)
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if (handler.end)
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handler.end(stack[i]);
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// Remove the open elements from the stack
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stack.length = pos;
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}
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}
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};
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this.HTMLtoXML = function (html) {
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var results = "";
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HTMLParser(html, {
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start: function (tag, attrs, unary) {
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results += "<" + tag;
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for (var i = 0; i < attrs.length; i++)
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results += " " + attrs[i].name + '="' + attrs[i].escaped + '"';
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results += ">";
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},
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end: function (tag) {
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results += "</" + tag + ">";
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},
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chars: function (text) {
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results += text;
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},
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comment: function (text) {
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results += "<!--" + text + "-->";
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}
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});
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return results;
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};
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this.HTMLtoDOM = function (html, doc) {
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// There can be only one of these elements
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var one = makeMap("html,head,body,title");
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// Enforce a structure for the document
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var structure = {
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link: "head",
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base: "head"
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};
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if (!doc) {
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if (typeof DOMDocument != "undefined")
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doc = new DOMDocument();
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else if (typeof document != "undefined" && document.implementation && document.implementation.createDocument)
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doc = document.implementation.createDocument("", "", null);
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else if (typeof ActiveX != "undefined")
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doc = new ActiveXObject("Msxml.DOMDocument");
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} else
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doc = doc.ownerDocument ||
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doc.getOwnerDocument && doc.getOwnerDocument() ||
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doc;
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var elems = [],
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documentElement = doc.documentElement ||
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doc.getDocumentElement && doc.getDocumentElement();
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// If we're dealing with an empty document then we
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// need to pre-populate it with the HTML document structure
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if (!documentElement && doc.createElement) (function () {
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var html = doc.createElement("html");
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var head = doc.createElement("head");
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head.appendChild(doc.createElement("title"));
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html.appendChild(head);
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html.appendChild(doc.createElement("body"));
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doc.appendChild(html);
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})();
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// Find all the unique elements
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if (doc.getElementsByTagName)
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for (var i in one)
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one[i] = doc.getElementsByTagName(i)[0];
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// If we're working with a document, inject contents into
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// the body element
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var curParentNode = one.body;
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HTMLParser(html, {
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start: function (tagName, attrs, unary) {
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// If it's a pre-built element, then we can ignore
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// its construction
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if (one[tagName]) {
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curParentNode = one[tagName];
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if (!unary) {
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elems.push(curParentNode);
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}
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return;
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}
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var elem = doc.createElement(tagName);
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for (var attr in attrs)
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elem.setAttribute(attrs[attr].name, attrs[attr].value);
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if (structure[tagName] && typeof one[structure[tagName]] != "boolean")
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one[structure[tagName]].appendChild(elem);
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else if (curParentNode && curParentNode.appendChild)
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curParentNode.appendChild(elem);
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if (!unary) {
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elems.push(elem);
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curParentNode = elem;
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}
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},
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end: function (tag) {
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elems.length -= 1;
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// Init the new parentNode
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curParentNode = elems[elems.length - 1];
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},
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chars: function (text) {
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curParentNode.appendChild(doc.createTextNode(text));
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},
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comment: function (text) {
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// create comment node
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}
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});
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return doc;
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};
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function makeMap(str) {
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var obj = {}, items = str.split(",");
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for (var i = 0; i < items.length; i++)
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obj[items[i]] = true;
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return obj;
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}
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})();
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