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jeremybenn |
/* tagStack.java -- The HTML tag stack.
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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.javax.swing.text.html.parser;
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import gnu.java.lang.CPStringBuilder;
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import gnu.javax.swing.text.html.parser.models.node;
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import gnu.javax.swing.text.html.parser.models.transformer;
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import java.util.BitSet;
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import java.util.Enumeration;
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import java.util.LinkedList;
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import java.util.ListIterator;
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import javax.swing.text.SimpleAttributeSet;
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import javax.swing.text.html.HTML;
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import javax.swing.text.html.parser.*;
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/**
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* <p>The HTML content validator, is responsible for opening and
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* closing elements with optional start/end tags, detecting
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* the wrongly placed html tags and reporting errors. The working instance
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* is the inner class inside the {@link javax.swing.text.html.parser.Parser }
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* </p>
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* <p>This class could potentially
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* provide basis for automated closing and insertion of the html tags,
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* correcting the found html errors.
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* @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
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*/
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public abstract class htmlValidator
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{
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/**
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* The tag reference, holding additional information that the tag
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* has been forcibly closed.
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*/
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protected class hTag
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{
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protected final Element element;
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protected final HTML.Tag tag;
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protected final TagElement tgElement;
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protected boolean forcibly_closed;
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protected node validationTrace;
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protected hTag(TagElement an_element)
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{
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element = an_element.getElement();
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tag = an_element.getHTMLTag();
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tgElement = an_element;
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if (element.content != null)
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validationTrace = transformer.transform(element.content, dtd);
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}
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/**
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* This is called when the tag must be forcibly closed because
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* it would make the newly appearing tag invalid.
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* The parser is not notified about such event (just the error
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* is reported). For such tags, the closing message does not
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* appear when later reaching the end of stream. The exception is
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* the <head> tag: the parser is notified about its silent closing
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* when <body> or other html content appears.
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*/
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protected void forciblyCloseDueContext()
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{
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forcibly_closed = true;
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}
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/**
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* This is called when the tag must be forcibly closed after
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* reaching the end of stream. The parser is notified as if
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* closing the tag explicitly.
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*/
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protected void forciblyCloseDueEndOfStream()
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{
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forcibly_closed = true;
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handleSupposedEndTag(element);
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}
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}
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/**
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* The DTD, providing information about the valid document structure.
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*/
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protected final DTD dtd;
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/**
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* The stack, holding the current tag context.
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*/
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protected final LinkedList stack = new LinkedList();
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/**
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* Creates a new tag stack, using the given DTD.
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* @param a_dtd A DTD, providing the information about the valid
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* tag content.
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*/
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public htmlValidator(DTD a_dtd)
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{
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dtd = a_dtd;
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}
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/**
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* Close all opened tags (called at the end of parsing).
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*/
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public void closeAll()
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{
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hTag h;
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while (!stack.isEmpty())
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{
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h = (hTag) stack.getLast();
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if (!h.forcibly_closed && !h.element.omitEnd())
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s_error("Unclosed <" + h.tag + ">, closing at the end of stream");
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handleSupposedEndTag(h.element);
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closeTag(h.tgElement);
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}
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}
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/**
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* Remove the given tag from the stack or (if found) from the list
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* of the forcibly closed tags.
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*/
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public boolean closeTag(TagElement tElement)
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{
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HTML.Tag tag = tElement.getHTMLTag();
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hTag x;
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hTag close;
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if (!stack.isEmpty())
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{
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ListIterator iter = stack.listIterator(stack.size());
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while (iter.hasPrevious())
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{
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x = (hTag) iter.previous();
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if (tag.equals(x.tag))
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{
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if (x.forcibly_closed && !x.element.omitEnd())
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s_error("The tag <" + x.tag +
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"> has already been forcibly closed"
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);
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// If the tag has a content model defined, forcibly close all
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// tags that were opened after the tag being currently closed.
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closing:
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if (x.element.content != null)
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{
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iter = stack.listIterator(stack.size());
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while (iter.hasPrevious())
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{
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close = (hTag) iter.previous();
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if (close == x)
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break closing;
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handleSupposedEndTag(close.element);
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iter.remove();
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}
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}
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stack.remove(x);
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return true;
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}
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}
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}
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s_error("Closing unopened <" + tag + ">");
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return false;
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}
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/**
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* Add the given HTML tag to the stack of the opened tags. Forcibly closes
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* all tags in the stack that does not allow this tag in they content (error
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* is reported).
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* @param element
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*/
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public void openTag(TagElement tElement, htmlAttributeSet parameters)
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{
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// If this is a fictional call, the message from the parser
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// has recursively returned - ignore.
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if (tElement.fictional())
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return;
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validateParameters(tElement, parameters);
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// If the stack is empty, start from HTML
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if (stack.isEmpty() && tElement.getHTMLTag() != HTML.Tag.HTML)
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{
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Element html = dtd.getElement(HTML.Tag.HTML.toString());
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openFictionalTag(html);
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}
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Object v = tagIsValidForContext(tElement);
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if (v != Boolean.TRUE)
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{
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// The tag is not valid for context, the content
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// model suggest to open another tag.
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if (v instanceof Element)
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{
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int n = 0;
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while (v instanceof Element && (n++ < 100))
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{
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Element fe = (Element) v;
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// notify the content model that we add the proposed tag
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node ccm = getCurrentContentModel();
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if (ccm != null)
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ccm.show(fe);
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openFictionalTag(fe);
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Object vv = tagIsValidForContext(tElement);
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if (vv instanceof Element) // One level of nesting is supported.
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{
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openFictionalTag((Element) vv);
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Object vx = tagIsValidForContext(tElement);
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if (vx instanceof Element)
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openFictionalTag((Element) vx);
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}
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else if (vv == Boolean.FALSE)
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{
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// The tag is still not valid for the current
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// content after opening a fictional element.
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if (fe.omitEnd())
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{
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// close the previously opened fictional tag.
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closeLast();
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vv = tagIsValidForContext(tElement);
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if (vv instanceof Element)
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// another tag was suggested by the content model
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openFictionalTag((Element) vv);
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}
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}
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v = tagIsValidForContext(tElement);
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}
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}
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else // If the current element has the optional end tag, close it.
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{
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if (!stack.isEmpty())
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{
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closing:
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do
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{
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hTag last = (hTag) stack.getLast();
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if (last.element.omitEnd())
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{
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closeLast();
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v = tagIsValidForContext(tElement);
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if (v instanceof Element) // another tag was suggested by the content model
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{
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openFictionalTag((Element) v);
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break closing;
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}
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}
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else
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break closing;
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}
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while (v == Boolean.FALSE && !stack.isEmpty());
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}
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}
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}
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stack.add(new hTag(tElement));
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}
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/**
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* Clear the stack.
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*/
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public void restart()
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{
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stack.clear();
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}
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| 307 |
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| 308 |
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/**
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* Check if this tag is valid for the current context. Return Boolean.True if
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| 310 |
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* it is OK, Boolean.False if it is surely not OK or the Element that the
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* content model recommends to insert making the situation ok. If Boolean.True
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* is returned, the content model current position is moved forward. Otherwise
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* this position remains the same.
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*
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| 315 |
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* @param tElement
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| 316 |
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* @return
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| 317 |
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*/
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| 318 |
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public Object tagIsValidForContext(TagElement tElement)
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{
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| 320 |
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// Check the current content model, if one is available.
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node cv = getCurrentContentModel();
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| 322 |
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| 323 |
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if (cv != null)
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| 324 |
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return cv.show(tElement.getElement());
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| 326 |
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// Check exclusions and inclusions.
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ListIterator iter = stack.listIterator(stack.size());
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| 328 |
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hTag t = null;
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final int idx = tElement.getElement().index;
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| 331 |
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// Check only known tags.
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if (idx >= 0)
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{
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| 334 |
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BitSet inclusions = new BitSet();
|
| 335 |
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while (iter.hasPrevious())
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| 336 |
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{
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| 337 |
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t = (hTag) iter.previous();
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| 338 |
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if (! t.forcibly_closed)
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| 339 |
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{
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| 340 |
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if (t.element.exclusions != null
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| 341 |
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&& t.element.exclusions.get(idx))
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| 342 |
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return Boolean.FALSE;
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| 343 |
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| 344 |
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if (t.element.inclusions != null)
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inclusions.or(t.element.inclusions);
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}
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| 347 |
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}
|
| 348 |
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if (! inclusions.get(idx))
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{
|
| 350 |
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// If we need to insert something, and cannot do this, but
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| 351 |
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// it is allowed to insert the paragraph here, insert the
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| 352 |
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// paragraph.
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| 353 |
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Element P = dtd.getElement(HTML_401F.P);
|
| 354 |
|
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if (inclusions.get(P.index))
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| 355 |
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return P;
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| 356 |
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else
|
| 357 |
|
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return Boolean.FALSE;
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| 358 |
|
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}
|
| 359 |
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}
|
| 360 |
|
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return Boolean.TRUE;
|
| 361 |
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}
|
| 362 |
|
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|
| 363 |
|
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/**
|
| 364 |
|
|
* Validate tag without storing in into the tag stack. This is called
|
| 365 |
|
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* for the empty tags and results the subsequent calls to the openTag
|
| 366 |
|
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* and closeTag.
|
| 367 |
|
|
*/
|
| 368 |
|
|
public void validateTag(TagElement tElement, htmlAttributeSet parameters)
|
| 369 |
|
|
{
|
| 370 |
|
|
openTag(tElement, parameters);
|
| 371 |
|
|
closeTag(tElement);
|
| 372 |
|
|
}
|
| 373 |
|
|
|
| 374 |
|
|
/**
|
| 375 |
|
|
* Check for mandatory elements, subsequent to the last tag:
|
| 376 |
|
|
* @param tElement The element that will be inserted next.
|
| 377 |
|
|
*/
|
| 378 |
|
|
protected void checkContentModel(TagElement tElement, boolean first)
|
| 379 |
|
|
{
|
| 380 |
|
|
if (stack.isEmpty())
|
| 381 |
|
|
return;
|
| 382 |
|
|
|
| 383 |
|
|
hTag last = (hTag) stack.getLast();
|
| 384 |
|
|
if (last.validationTrace == null)
|
| 385 |
|
|
return;
|
| 386 |
|
|
|
| 387 |
|
|
Object r = last.validationTrace.show(tElement.getElement());
|
| 388 |
|
|
if (r == Boolean.FALSE)
|
| 389 |
|
|
s_error("The <" + last.element + "> does not match the content model " +
|
| 390 |
|
|
last.validationTrace
|
| 391 |
|
|
);
|
| 392 |
|
|
else if (r instanceof Element) // The content model recommends insertion of this element
|
| 393 |
|
|
{
|
| 394 |
|
|
if (!first)
|
| 395 |
|
|
closeTag(last.tgElement);
|
| 396 |
|
|
handleSupposedStartTag((Element) r);
|
| 397 |
|
|
openTag(new TagElement((Element) r), null);
|
| 398 |
|
|
}
|
| 399 |
|
|
}
|
| 400 |
|
|
|
| 401 |
|
|
/**
|
| 402 |
|
|
* The method is called when the tag must be closed because
|
| 403 |
|
|
* it does not allow the subsequent elements inside its context
|
| 404 |
|
|
* or the end of stream has been reached. The parser is only
|
| 405 |
|
|
* informed if the element being closed does not require the
|
| 406 |
|
|
* end tag (the "omitEnd" flag is set).
|
| 407 |
|
|
* The closing message must be passed to the parser mechanism
|
| 408 |
|
|
* before passing message about the opening the next tag.
|
| 409 |
|
|
*
|
| 410 |
|
|
* @param element The tag being fictionally (forcibly) closed.
|
| 411 |
|
|
*/
|
| 412 |
|
|
protected abstract void handleSupposedEndTag(Element element);
|
| 413 |
|
|
|
| 414 |
|
|
/**
|
| 415 |
|
|
* The method is called when the validator decides to open the
|
| 416 |
|
|
* tag on its own initiative. This may happen if the content model
|
| 417 |
|
|
* includes the element with the optional (supposed) start tag.
|
| 418 |
|
|
*
|
| 419 |
|
|
* @param element The tag being opened.
|
| 420 |
|
|
*/
|
| 421 |
|
|
protected abstract void handleSupposedStartTag(Element element);
|
| 422 |
|
|
|
| 423 |
|
|
/**
|
| 424 |
|
|
* Handles the error message. This method must be overridden to pass
|
| 425 |
|
|
* the message where required.
|
| 426 |
|
|
* @param msg The message text.
|
| 427 |
|
|
*/
|
| 428 |
|
|
protected abstract void s_error(String msg);
|
| 429 |
|
|
|
| 430 |
|
|
/**
|
| 431 |
|
|
* Validate the parameters, report the error if the given parameter is
|
| 432 |
|
|
* not in the parameter set, valid for the given attribute. The information
|
| 433 |
|
|
* about the valid parameter set is taken from the Element, enclosed
|
| 434 |
|
|
* inside the tag. The method does not validate the default parameters.
|
| 435 |
|
|
* @param tag The tag
|
| 436 |
|
|
* @param parameters The parameters of this tag.
|
| 437 |
|
|
*/
|
| 438 |
|
|
protected void validateParameters(TagElement tag, htmlAttributeSet parameters)
|
| 439 |
|
|
{
|
| 440 |
|
|
if (parameters == null ||
|
| 441 |
|
|
parameters == htmlAttributeSet.EMPTY_HTML_ATTRIBUTE_SET ||
|
| 442 |
|
|
parameters == SimpleAttributeSet.EMPTY
|
| 443 |
|
|
)
|
| 444 |
|
|
return;
|
| 445 |
|
|
|
| 446 |
|
|
Enumeration enumeration = parameters.getAttributeNames();
|
| 447 |
|
|
|
| 448 |
|
|
while (enumeration.hasMoreElements())
|
| 449 |
|
|
{
|
| 450 |
|
|
validateAttribute(tag, parameters, enumeration);
|
| 451 |
|
|
}
|
| 452 |
|
|
|
| 453 |
|
|
// Check for missing required values.
|
| 454 |
|
|
AttributeList a = tag.getElement().getAttributes();
|
| 455 |
|
|
|
| 456 |
|
|
while (a != null)
|
| 457 |
|
|
{
|
| 458 |
|
|
if (a.getModifier() == DTDConstants.REQUIRED)
|
| 459 |
|
|
if (parameters.getAttribute(a.getName()) == null)
|
| 460 |
|
|
{
|
| 461 |
|
|
s_error("Missing required attribute '" + a.getName() + "' for <" +
|
| 462 |
|
|
tag.getHTMLTag() + ">"
|
| 463 |
|
|
);
|
| 464 |
|
|
}
|
| 465 |
|
|
a = a.next;
|
| 466 |
|
|
}
|
| 467 |
|
|
}
|
| 468 |
|
|
|
| 469 |
|
|
private node getCurrentContentModel()
|
| 470 |
|
|
{
|
| 471 |
|
|
if (!stack.isEmpty())
|
| 472 |
|
|
{
|
| 473 |
|
|
hTag last = (hTag) stack.getLast();
|
| 474 |
|
|
return last.validationTrace;
|
| 475 |
|
|
}
|
| 476 |
|
|
else
|
| 477 |
|
|
return null;
|
| 478 |
|
|
}
|
| 479 |
|
|
|
| 480 |
|
|
private void closeLast()
|
| 481 |
|
|
{
|
| 482 |
|
|
handleSupposedEndTag(((hTag) stack.getLast()).element);
|
| 483 |
|
|
stack.removeLast();
|
| 484 |
|
|
}
|
| 485 |
|
|
|
| 486 |
|
|
private void openFictionalTag(Element e)
|
| 487 |
|
|
{
|
| 488 |
|
|
handleSupposedStartTag(e);
|
| 489 |
|
|
stack.add(new hTag(new TagElement(e, true)));
|
| 490 |
|
|
if (!e.omitStart())
|
| 491 |
|
|
s_error("<" + e + "> is expected (supposing it)");
|
| 492 |
|
|
}
|
| 493 |
|
|
|
| 494 |
|
|
private void validateAttribute(TagElement tag, htmlAttributeSet parameters,
|
| 495 |
|
|
Enumeration enumeration
|
| 496 |
|
|
)
|
| 497 |
|
|
{
|
| 498 |
|
|
Object foundAttribute;
|
| 499 |
|
|
AttributeList dtdAttribute;
|
| 500 |
|
|
foundAttribute = enumeration.nextElement();
|
| 501 |
|
|
dtdAttribute = tag.getElement().getAttribute(foundAttribute.toString());
|
| 502 |
|
|
if (dtdAttribute == null)
|
| 503 |
|
|
{
|
| 504 |
|
|
CPStringBuilder valid =
|
| 505 |
|
|
new CPStringBuilder("The tag <" + tag.getHTMLTag() +
|
| 506 |
|
|
"> cannot contain the attribute '" + foundAttribute +
|
| 507 |
|
|
"'. The valid attributes for this tag are: "
|
| 508 |
|
|
);
|
| 509 |
|
|
|
| 510 |
|
|
AttributeList a = tag.getElement().getAttributes();
|
| 511 |
|
|
|
| 512 |
|
|
while (a != null)
|
| 513 |
|
|
{
|
| 514 |
|
|
valid.append(a.name.toUpperCase());
|
| 515 |
|
|
valid.append(' ');
|
| 516 |
|
|
a = a.next;
|
| 517 |
|
|
}
|
| 518 |
|
|
s_error(valid.toString());
|
| 519 |
|
|
}
|
| 520 |
|
|
|
| 521 |
|
|
else
|
| 522 |
|
|
{
|
| 523 |
|
|
String value = parameters.getAttribute(foundAttribute).toString();
|
| 524 |
|
|
|
| 525 |
|
|
if (dtdAttribute.type == DTDConstants.NUMBER)
|
| 526 |
|
|
validateNumberAttribute(tag, foundAttribute, value);
|
| 527 |
|
|
|
| 528 |
|
|
if (dtdAttribute.type == DTDConstants.NAME ||
|
| 529 |
|
|
dtdAttribute.type == DTDConstants.ID
|
| 530 |
|
|
)
|
| 531 |
|
|
validateNameOrIdAttribute(tag, foundAttribute, value);
|
| 532 |
|
|
|
| 533 |
|
|
if (dtdAttribute.values != null)
|
| 534 |
|
|
validateAttributeWithValueList(tag, foundAttribute, dtdAttribute,
|
| 535 |
|
|
value
|
| 536 |
|
|
);
|
| 537 |
|
|
}
|
| 538 |
|
|
}
|
| 539 |
|
|
|
| 540 |
|
|
private void validateAttributeWithValueList(TagElement tag,
|
| 541 |
|
|
Object foundAttribute,
|
| 542 |
|
|
AttributeList dtdAttribute,
|
| 543 |
|
|
String value
|
| 544 |
|
|
)
|
| 545 |
|
|
{
|
| 546 |
|
|
if (!dtdAttribute.values.contains(value.toLowerCase()) &&
|
| 547 |
|
|
!dtdAttribute.values.contains(value.toUpperCase())
|
| 548 |
|
|
)
|
| 549 |
|
|
{
|
| 550 |
|
|
CPStringBuilder valid;
|
| 551 |
|
|
if (dtdAttribute.values.size() == 1)
|
| 552 |
|
|
valid =
|
| 553 |
|
|
new CPStringBuilder("The attribute '" + foundAttribute +
|
| 554 |
|
|
"' of the tag <" + tag.getHTMLTag() +
|
| 555 |
|
|
"> cannot have the value '" + value +
|
| 556 |
|
|
"'. The only valid value is "
|
| 557 |
|
|
);
|
| 558 |
|
|
else
|
| 559 |
|
|
valid =
|
| 560 |
|
|
new CPStringBuilder("The attribute '" + foundAttribute +
|
| 561 |
|
|
"' of the tag <" + tag.getHTMLTag() +
|
| 562 |
|
|
"> cannot have the value '" + value + "'. The " +
|
| 563 |
|
|
dtdAttribute.values.size() +
|
| 564 |
|
|
" valid values are: "
|
| 565 |
|
|
);
|
| 566 |
|
|
|
| 567 |
|
|
Enumeration vv = dtdAttribute.values.elements();
|
| 568 |
|
|
while (vv.hasMoreElements())
|
| 569 |
|
|
{
|
| 570 |
|
|
valid.append('"');
|
| 571 |
|
|
valid.append(vv.nextElement());
|
| 572 |
|
|
valid.append("\" ");
|
| 573 |
|
|
}
|
| 574 |
|
|
s_error(valid.toString());
|
| 575 |
|
|
}
|
| 576 |
|
|
}
|
| 577 |
|
|
|
| 578 |
|
|
private void validateNameOrIdAttribute(TagElement tag, Object foundAttribute,
|
| 579 |
|
|
String value
|
| 580 |
|
|
)
|
| 581 |
|
|
{
|
| 582 |
|
|
boolean ok = true;
|
| 583 |
|
|
|
| 584 |
|
|
if (!Character.isLetter(value.charAt(0)))
|
| 585 |
|
|
ok = false;
|
| 586 |
|
|
|
| 587 |
|
|
char c;
|
| 588 |
|
|
for (int i = 0; i < value.length(); i++)
|
| 589 |
|
|
{
|
| 590 |
|
|
c = value.charAt(i);
|
| 591 |
|
|
if (!(
|
| 592 |
|
|
Character.isLetter(c) || Character.isDigit(c) ||
|
| 593 |
|
|
"".indexOf(c) >= 0
|
| 594 |
|
|
)
|
| 595 |
|
|
)
|
| 596 |
|
|
ok = false;
|
| 597 |
|
|
}
|
| 598 |
|
|
if (!ok)
|
| 599 |
|
|
s_error("The '" + foundAttribute + "' attribute of the tag <" +
|
| 600 |
|
|
tag.getHTMLTag() + "> must start from letter and consist of " +
|
| 601 |
|
|
"letters, digits, hypens, colons, underscores and periods. " +
|
| 602 |
|
|
"It cannot be '" + value + "'"
|
| 603 |
|
|
);
|
| 604 |
|
|
}
|
| 605 |
|
|
|
| 606 |
|
|
private void validateNumberAttribute(TagElement tag, Object foundAttribute,
|
| 607 |
|
|
String value
|
| 608 |
|
|
)
|
| 609 |
|
|
{
|
| 610 |
|
|
try
|
| 611 |
|
|
{
|
| 612 |
|
|
Integer.parseInt(value);
|
| 613 |
|
|
}
|
| 614 |
|
|
catch (NumberFormatException ex)
|
| 615 |
|
|
{
|
| 616 |
|
|
s_error("The '" + foundAttribute + "' attribute of the tag <" +
|
| 617 |
|
|
tag.getHTMLTag() + "> must be a valid number and not '" +
|
| 618 |
|
|
value + "'"
|
| 619 |
|
|
);
|
| 620 |
|
|
}
|
| 621 |
|
|
}
|
| 622 |
|
|
}
|
