/* DocumentParser.java -- A parser for HTML documents. Copyright (C) 2005 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath 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 for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. */ package javax.swing.text.html.parser; import java.io.IOException; import java.io.Reader; /** *

A simple error-tolerant HTML parser that uses a DTD document * to access data on the possible tokens, arguments and syntax.

*

The parser reads an HTML content from a Reader and calls various * notifying methods (which should be overridden in a subclass) * when tags or data are encountered.

*

Some HTML elements need no opening or closing tags. The * task of this parser is to invoke the tag handling methods also when * the tags are not explicitly specified and must be supposed using * information, stored in the DTD. * For example, parsing the document *

<table><tr><td>a<td>b<td>c</tr>
* will invoke exactly the handling methods exactly in the same order * (and with the same parameters) as if parsing the document:
* <html><head></head><body><table>< * tbody><tr><td>a</td><td>b * </td><td>c</td></tr>< * /tbody></table></body></html>

* (supposed tags are given in italics). The parser also supports * obsolete elements of HTML syntax.

*

* In this implementation, DocumentParser is directly derived from its * ancestor without changes of functionality. * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org) */ public class DocumentParser extends Parser implements DTDConstants { /** * Creates a new parser that uses the given DTD to access data on the * possible tokens, arguments and syntax. There is no single - step way * to get a default DTD; you must either refer to the implementation - * specific packages, write your own DTD or obtain the working instance * of parser in other way, for example, by calling * {@link javax.swing.text.html.HTMLEditorKit#getParser() }. * @param a_dtd A DTD to use. */ public DocumentParser(DTD a_dtd) { super(a_dtd); } /** * Parse the HTML text, calling various methods in response to the * occurence of the corresponding HTML constructions. * @param reader The reader to read the source HTML from. * @throws IOException If the reader throws one. */ public synchronized void parse(Reader reader) throws IOException { super.parse(reader); } /** * Handle HTML comment. The default method returns without action. * @param comment The comment being handled */ protected void handleComment(char[] comment) { } /** * Handle the tag with no content, like <br>. The method is * called for the elements that, in accordance with the current DTD, * has an empty content. * @param tag The tag being handled. * @throws javax.swing.text.ChangedCharSetException */ protected void handleEmptyTag(TagElement tag) throws javax.swing.text.ChangedCharSetException { } /** * The method is called when the HTML closing tag ((like </table>) * is found or if the parser concludes that the one should be present * in the current position. * @param The tag being handled */ protected void handleEndTag(TagElement tag) { } /* Handle error that has occured in the given line. */ protected void handleError(int line, String message) { } /** * The method is called when the HTML opening tag ((like <table>) * is found or if the parser concludes that the one should be present * in the current position. * @param The tag being handled */ protected void handleStartTag(TagElement tag) { } /** * Handle the text section. * @param text A section text. */ protected void handleText(char[] text) { } }