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/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores
* CA 94065 USA or visit www.oracle.com if you need additional information or
* have any questions.
*/
package com.codename1.ui.html;
import com.codename1.xml.Element;
import com.codename1.xml.XMLParser;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
/**
* The HTMLParser class is used to parse an XHTML-MP 1.0 document into a DOM object (Element).
* Unsupported tags and attributes as well as comments are dropped in the parsing process.
* The parser is also makes use of CSSParser for external CSS files, embedded CSS segments and CSS within the 'style' attribute.
*
* @author Ofir Leitner
*/
public class HTMLParser extends XMLParser {
HTMLComponent htmlC; // The HTMLComponent that uses this Parser
/**
* The list of empty tags (tags that naturally don't have any children).
* This is used to enable empty tags to be closed also in a non-strict way (i.e. <br> instead of <br>/;)
* some of these tags are not a part of the XHTML-MP 1.0 standard, but including them here allows a more smooth parsing if the document is not strictly XHTML-MP 1.0
*/
private static String[] EMPTY_TAGS = {"br","link","meta","base","area","basefont","col","frame","hr","img","input","isindex","param"};
/**
* Constructs a new instance of HTMLParser
*/
public HTMLParser() {
// Add common char entities that are above the HTML 2.0 char entities range
addCharEntity("bull", 8226);
addCharEntity("euro", 8364);
setIncludeWhitespacesBetweenTags(true);
}
/**
* Pair this HTMLParser with the HTMLComponent that uses it.
* This pairing is necessary to allow access to the htmlC in parseTagContent upon finding a CSS embedded segment
*
* @param htmlC The HTMLComponent that uses this parser
*/
void setHTMLComponent(HTMLComponent htmlC) {
if ((htmlC!=null) && (this.htmlC!=null)) {
throw new IllegalStateException("This HTMLParser is already paired with an HTMLComponent");
}
this.htmlC=htmlC;
}
/**
* Overrides XMLParser.parseTagContent to enable embedded CSS segments (Style tags)
*
* @param element The current parent element
* @param is The reader containing the XML
* @throws IOException if an I/O error in the stream is encountered
*/
protected void parseTagContent(Element element, Reader is) throws IOException {
if ((HTMLComponent.SUPPORT_CSS) && (htmlC.loadCSS) && (((HTMLElement)element).getTagId() == HTMLElement.TAG_STYLE)) { // We aren't strict and don't require text/css in a style tag // && "text/css".equals(element.getAttributeById(Element.ATTR_TYPE)))) {
CSSElement addTo = CSSParser.getInstance().parseCSSSegment(is,null,htmlC,null);
htmlC.addToEmebeddedCSS(addTo);
return;
}
super.parseTagContent(element, is);
}
/**
* Overrides XMLParser.createNewElement to return an HTMLElement instance
*
* @param name The HTMLElement's name
* @return a new instance of the names HTMLElement
*/
protected Element createNewElement(String name) {
HTMLElement elem=new HTMLElement(name);
return elem;
}
/**
* Overrides XMLParser.createNewTextElement to return an HTMLElement instance
*
* @param text The HTMLElement's text
* @return a new instance of the HTMLElement
*/
protected Element createNewTextElement(String text) {
HTMLElement elem=new HTMLElement(text,true);
return elem;
}
/**
* Overrides XMLParser.convertCharEntity to add in HTML char entities
*
* @param charEntity The char entity to convert
* @return A string containing a single char, or the original char entity string (with & and ;) if the char entity couldn't be resolved
*/
protected String convertCharEntity(String charEntity) {
try {
return HTMLUtils.convertCharEntity(charEntity, true, null);
} catch (IllegalArgumentException iae) {
return super.convertCharEntity(charEntity);
}
}
/**
* This method translates between an HTML char entity string to the according char code.
* It first tries to find it using its super method.
* If not found, the search continues to a wider string array of char codes 160-255 which are supported in ISO-8859-1 / HTML 2.0
*
* @param symbol The symbol to lookup
* @return The char code of the symbol, or -1 if none found
*
protected int getCharEntityCode(String symbol) {
int val=super.getCharEntityCode(symbol);
if (val==-1) {
// Not one of the most popular char codes, proceed to check the ISO-8859-1 symbols array
val=CSSElement.getStringVal(symbol, CHAR_ENTITY_STRINGS);
if (val!=-1) {
return val+160;
}
}
return val;
}*/
/**
* Checks whether the specified tag is an empty tag as defined in EMPTY_TAGS
*
* @param tagName The tag name to check
* @return true if that tag is defined as an empty tag, false otherwise
*/
protected boolean isEmptyTag(String tagName) {
int i=0;
boolean found=false;
while ((i
