267 lines
7.6 KiB
Java
267 lines
7.6 KiB
Java
/* DomHTMLParser.java --
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.xml.dom.html2;
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import gnu.javax.swing.text.html.parser.support.Parser;
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import java.io.IOException;
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import java.io.Reader;
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import java.util.Enumeration;
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import java.util.Iterator;
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import java.util.LinkedList;
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import javax.swing.text.AttributeSet;
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import javax.swing.text.html.HTML;
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import javax.swing.text.html.parser.DTD;
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import javax.swing.text.html.parser.TagElement;
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import org.w3c.dom.NamedNodeMap;
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import org.w3c.dom.Node;
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import org.w3c.dom.html2.HTMLDocument;
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/**
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* This parser reads HTML from the given stream and stores into
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* {@link HTMLDocument}. The HTML tag becomes the {@link Node}.
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* The tag attributes become the node attributes. The text inside
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* HTML tag is inserted as one or several text nodes. The nested
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* HTML tags are inserted as child nodes.
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*
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* If the strict tree structure, closing the tag means closing all
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* nested tags. To work around this, this parser closes the nested
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* tags and immediately reopens them after the closed tag.
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* In this way, <code><b><i>c</b>d</code>
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* is parsed as <code><b><i>c</i></b><i>d</code> .
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*
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* @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
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*/
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public class DomHTMLParser
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extends gnu.javax.swing.text.html.parser.support.Parser
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{
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/**
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* The target where HTML document will be inserted.
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*/
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protected DomHTMLDocument document;
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/**
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* The subsequently created new nodes will be inserted as the
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* childs of this cursor.
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*/
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protected Node cursor;
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/**
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* Create parser using the given DTD.
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*
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* @param dtd the DTD (for example,
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* {@link gnu.javax.swing.text.html.parser.HTML_401F}).
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*/
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public DomHTMLParser(DTD dtd)
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{
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super(dtd);
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}
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/**
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* Parse SGML insertion ( <! ... > ).
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* Currently just treats it as comment.
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*/
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public boolean parseMarkupDeclarations(StringBuffer strBuff)
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throws java.io.IOException
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{
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Node c = document.createComment(strBuff.toString());
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cursor.appendChild(c);
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return false;
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}
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/**
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* Read the document, present in the given stream, and
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* return the corresponding {@link HTMLDocument}.
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*
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* @param input a stream to read from.
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* @return a document, reflecting the structure of the provided HTML
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* text.
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*
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* @throws IOException if the reader throws one.
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*/
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public HTMLDocument parseDocument(Reader input)
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throws IOException
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{
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try
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{
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document = new DomHTMLDocument();
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document.setCheckWellformedness(false);
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document.setCheckingCharacters(false);
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cursor = document;
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parse(input);
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DomHTMLDocument h = document;
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document = null;
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return h;
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}
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catch (Exception ex)
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{
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ex.printStackTrace();
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throw new IOException("Exception: " + ex.getMessage());
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}
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}
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/**
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* Create a new node.
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* @param name the name of node, case insensitive.
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* @return the created node.
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*/
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protected Node createNode(String name)
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{
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Node new_node = document.createElement(name.toLowerCase());
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AttributeSet hatts = getAttributes();
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NamedNodeMap natts = new_node.getAttributes();
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Enumeration enumeration = hatts.getAttributeNames();
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Object key;
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Node attribute;
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while (hatts != null)
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{
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while (enumeration.hasMoreElements())
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{
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key = enumeration.nextElement();
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attribute = document.createAttribute(key.toString());
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attribute.setNodeValue(hatts.getAttribute(key).toString());
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natts.setNamedItem(attribute);
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}
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// The default values are stored in a parent node.
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hatts = hatts.getResolveParent();
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}
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return new_node;
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}
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/**
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* Handle comment by inserting the comment node.
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* @param text the comment text.
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*/
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protected void handleComment(char[] text)
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{
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Node c = document.createComment(new String(text));
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cursor.appendChild(c);
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}
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/**
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* Handle the tag with no content.
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* @param tag the tag to handle.
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*/
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protected void handleEmptyTag(TagElement tag)
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{
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String name = tag.getHTMLTag().toString();
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if (name.equalsIgnoreCase("#pcdata"))
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return;
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Node c = createNode(name);
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cursor.appendChild(c);
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}
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/**
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* Close the given tag. Close and reopen all nested tags.
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* @param tag the tag to close.
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*/
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protected void handleEndTag(TagElement tag)
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{
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String name = tag.getHTMLTag().toString();
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String nname = cursor.getNodeName();
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// Closing the current tag.
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if (nname != null && nname.equalsIgnoreCase(name))
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{
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cursor = cursor.getParentNode();
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}
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else
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{
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Node nCursor = cursor.getParentNode();
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// Remember the opened nodes.
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LinkedList open = new LinkedList();
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Node close = cursor;
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while (close != null && !close.getNodeName().equalsIgnoreCase(name))
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{
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if (close != document)
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open.addFirst(close);
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close = close.getParentNode();
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}
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if (close == null)
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cursor = document;
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else
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cursor = close.getParentNode();
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// Insert the copies of the opened nodes.
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Iterator iter = open.iterator();
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while (iter.hasNext())
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{
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Node item = (Node) iter.next();
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cursor.appendChild(item);
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cursor = item;
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}
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}
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}
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/**
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* Handle the start tag by inserting the HTML element.
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* @param tag the tag to handle.
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*/
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protected void handleStartTag(TagElement tag)
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{
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HTML.Tag h = tag.getHTMLTag();
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Node c = createNode(h.toString());
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cursor.appendChild(c);
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cursor = c;
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}
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/**
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* Handle text by inserting the text node.
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* @param text the text to insert.
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*/
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protected void handleText(char[] text)
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{
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Node c = document.createTextNode(text, 0, text.length);
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cursor.appendChild(c);
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}
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}
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