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/*******************************************************************************
* Copyright (c) 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.wst.html.core.validate;
import org.eclipse.wst.common.contentmodel.CMAttributeDeclaration;
import org.eclipse.wst.common.contentmodel.CMElementDeclaration;
import org.eclipse.wst.common.contentmodel.CMNamedNodeMap;
import org.eclipse.wst.sse.core.IndexedRegion;
import org.eclipse.wst.sse.core.text.ITextRegion;
import org.eclipse.wst.xml.core.document.XMLAttr;
import org.eclipse.wst.xml.core.document.XMLElement;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
public class NamespaceValidator extends PrimeValidator implements ErrorState {
private final static String XMLNS_PREFIX = "xmlns";//$NON-NLS-1$
private final static String NS_SEPARATOR = ":";//$NON-NLS-1$
public NamespaceValidator() {
super();
}
public boolean isAdapterForType(Object type) {
return ((type == NamespaceValidator.class) || super.isAdapterForType(type));
}
public void validate(IndexedRegion node) {
Element target = (Element) node;
if (isXMLElement(target) && hasUnknownPrefix(target)) {
XMLElement e = (XMLElement) target;
if (!isValidPrefix(e.getPrefix(), target) && !e.isCommentTag()) {
// report unknown tag error.
Segment errorSeg = FMUtil.getSegment(e, FMUtil.SEG_START_TAG);
if (errorSeg != null)
reporter.report(MessageFactory.createMessage(new ErrorInfoImpl(UNDEFINED_NAME_ERROR, errorSeg, e)));
}
}
// (2) check prefix of each attr
NamedNodeMap attrs = target.getAttributes();
for (int i = 0; i < attrs.getLength(); i++) {
Node n = attrs.item(i);
if (!(n instanceof XMLAttr))
continue;
XMLAttr a = (XMLAttr) n;
String prefix = a.getPrefix();
if ((prefix != null) && isUnknownAttr(a, target)) {
// The attr has unknown prefix. So, check it.
if (!isValidPrefix(prefix, target)) {
// report unknown attr error.
ITextRegion r = a.getNameRegion();
if (r == null)
continue;
int a_offset = a.getNameRegionStartOffset();
int a_length = a.getNameRegion().getLength();
reporter.report(MessageFactory.createMessage(new ErrorInfoImpl(UNDEFINED_NAME_ERROR, new Segment(a_offset, a_length), a)));
}
}
}
}
// private methods
private boolean isXMLElement(Element target) {
return target instanceof XMLElement;
}
private boolean hasUnknownPrefix(Element target) {
return isUnknownElement(target) && CMUtil.isForeign(target);
}
private boolean isUnknownElement(Element target) {
CMElementDeclaration dec = CMUtil.getDeclaration(target);
return dec == null;
}
private boolean isUnknownAttr(XMLAttr attr, Element target) {
CMElementDeclaration dec = CMUtil.getDeclaration(target);
if (dec == null)
return true; // unknown.
CMNamedNodeMap adecls = dec.getAttributes();
CMAttributeDeclaration adec = (CMAttributeDeclaration) adecls.getNamedItem(attr.getName());
return adec == null;
}
private boolean isValidPrefix(String prefix, Element e) {
if (prefix.equals(XMLNS_PREFIX))
return true; // "xmlns:foo" attr is always valid.
// (1) check the element has the namespace definition or not.
if (isValidPrefixWithinElement(prefix, e))
return true;
// (2) check ancestors of the element have the namespace definition or not.
Element parent = SMUtil.getParentElement(e);
while (parent != null) {
if (isValidPrefixWithinElement(prefix, parent))
return true;
parent = SMUtil.getParentElement(parent);
}
return false;
}
private boolean isValidPrefixWithinElement(String prefix, Element e) {
String ns = XMLNS_PREFIX + NS_SEPARATOR + prefix;
NamedNodeMap attrs = e.getAttributes();
for (int i = 0; i < attrs.getLength(); i++) {
Node n = attrs.item(i);
if (n == null)
continue;
if (n.getNodeType() != Node.ATTRIBUTE_NODE)
continue;
if (ns.equals(((Attr) n).getName()))
return true;
}
return false;
}
}
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