1 files changed, 127 insertions, 0 deletions
diff --git a/bundles/org.eclipse.wst.html.core/src/org/eclipse/wst/html/core/validate/NamespaceValidator.java b/bundles/org.eclipse.wst.html.core/src/org/eclipse/wst/html/core/validate/NamespaceValidator.java
new file mode 100644
index 0000000000..f2e605da44
--- /dev/null
+++ b/bundles/org.eclipse.wst.html.core/src/org/eclipse/wst/html/core/validate/NamespaceValidator.java
@@ -0,0 +1,127 @@
+/*******************************************************************************
+ * 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;
+	}
+}
+\ No newline at end of file