logging

xml/impl/src/com/intellij/psi/impl/source/xml/TagNameReference.java

@@ -22,6 +22,7 @@ import com.intellij.codeInsight.lookup.LookupElement;
 import com.intellij.codeInsight.lookup.LookupElementBuilder;
 import com.intellij.codeInsight.lookup.TailTypeDecorator;
 import com.intellij.lang.ASTNode;
+import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.util.TextRange;
 import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.psi.PsiElement;
@@ -53,6 +54,8 @@ import org.jetbrains.annotations.Nullable;
 import java.util.*;
 
 public class TagNameReference implements PsiReference {
+  private static final Logger LOG = Logger.getInstance("#com.intellij.psi.impl.source.xml.TagNameReference");
+
   protected final boolean myStartTagFlag;
   private final ASTNode myNameElement;
 
@@ -109,6 +112,11 @@ public class TagNameReference implements PsiReference {
     final XmlTag tag = getTagElement();
     final XmlElementDescriptor descriptor = tag != null ? tag.getDescriptor():null;
 
+    LOG.debug("Descriptor for tag " +
+              (tag != null ? tag.getName() : "NULL") +
+              " is " +
+              (descriptor != null ? (descriptor.toString() + ": " + descriptor.getClass().getCanonicalName()) : "NULL"));
+
     if (descriptor != null){
       return descriptor instanceof AnyXmlElementDescriptor ? tag : descriptor.getDeclaration();
     }

xml/impl/src/com/intellij/psi/impl/source/xml/XmlDocumentImpl.java

@@ -21,6 +21,7 @@ import com.intellij.lang.ASTNode;
 import com.intellij.lang.dtd.DTDLanguage;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.progress.ProcessCanceledException;
+import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.pom.PomManager;
 import com.intellij.pom.PomModel;
 import com.intellij.pom.event.PomModelEvent;
@@ -198,6 +199,11 @@ public class XmlDocumentImpl extends XmlElementImpl implements XmlDocument {
 
     if (XmlUtil.HTML_URI.equals(namespace)) {
       XmlNSDescriptor nsDescriptor = doctype != null ? getNsDescriptorFormDocType(doctype, containingFile, true) : null;
+      if (doctype != null) {
+        LOG.debug(
+          "Descriptor from doctype " + doctype + " is " + (nsDescriptor != null ? nsDescriptor.getClass().getCanonicalName() : "NULL"));
+      }
+
       if (nsDescriptor == null) {
         String htmlns = ExternalResourceManagerEx.getInstanceEx().getDefaultHtmlDoctype(getProject());
         if (htmlns == null || htmlns.length() == 0) {
@@ -257,16 +263,38 @@ public class XmlDocumentImpl extends XmlElementImpl implements XmlDocument {
 
     return null;
   }
+  
+  @NotNull
+  private static String getFilePathForLogging(@Nullable PsiFile file) {
+    if (file == null) {
+      return "NULL";
+    }
+    final VirtualFile vFile = file.getVirtualFile();
+    return vFile != null ? vFile.getPath() : "NULL_VFILE";
+  }
 
   @Nullable
   private XmlNSDescriptor getNsDescriptorFormDocType(final XmlDoctype doctype, final XmlFile containingFile, final boolean forHtml) {
     XmlNSDescriptor descriptor = getNSDescriptorFromMetaData(doctype.getMarkupDecl(), true);
 
+    final String filePath = getFilePathForLogging(containingFile);
+
     final String dtdUri = XmlUtil.getDtdUri(doctype);
+    LOG.debug("DTD url for doctype " + doctype.getText() + " in file " + filePath + " is " + dtdUri);
+    
     if (dtdUri != null && dtdUri.length() > 0){
       final XmlFile xmlFile = XmlUtil.findNamespace(containingFile, dtdUri);
+      final String schemaFilePath = getFilePathForLogging(xmlFile);
+      
+      LOG.debug("Schema file for " + filePath + " is " + schemaFilePath);
+      
       XmlNSDescriptor descriptorFromDtd = getNSDescriptorFromMetaData(xmlFile == null ? null : xmlFile.getDocument(), forHtml);
 
+      LOG.debug("Descriptor from meta data for schema file " +
+                schemaFilePath +
+                " is " +
+                (descriptorFromDtd != null ? descriptorFromDtd.getClass().getCanonicalName() : "NULL"));
+
       if (descriptor != null && descriptorFromDtd != null){
         descriptor = new XmlNSDescriptorSequence(new XmlNSDescriptor[]{descriptor, descriptorFromDtd});
       }

xml/impl/src/com/intellij/psi/impl/source/xml/XmlTagImpl.java

@@ -447,6 +447,10 @@ public class XmlTagImpl extends XmlElementImpl implements XmlTag {
 
     XmlElementDescriptor elementDescriptor = null;
     final XmlNSDescriptor nsDescriptor = getNSDescriptor(namespace, false);
+
+    LOG.debug(
+      "Descriptor for namespace " + namespace + " is " + (nsDescriptor != null ? nsDescriptor.getClass().getCanonicalName() : "NULL"));
+    
     if (nsDescriptor != null) {
       if (!DumbService.getInstance(getProject()).isDumb() || DumbService.isDumbAware(nsDescriptor)) {
         elementDescriptor = nsDescriptor.getElementDescriptor(this);

xml/relaxng/src/org/intellij/html/RelaxedHtmlFromRngNSDescriptor.java

@@ -16,6 +16,7 @@
 package org.intellij.html;
 
 import com.intellij.html.RelaxedHtmlNSDescriptor;
+import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.psi.xml.XmlDocument;
 import com.intellij.psi.xml.XmlTag;
 import com.intellij.util.ArrayUtil;
@@ -31,9 +32,16 @@ import org.jetbrains.annotations.Nullable;
  * @author Eugene.Kudelevsky
  */
 public class RelaxedHtmlFromRngNSDescriptor extends RngNsDescriptor implements RelaxedHtmlNSDescriptor {
+  private static final Logger LOG = Logger.getInstance("#org.intellij.html.RelaxedHtmlFromRngNSDescriptor");
+
   public XmlElementDescriptor getElementDescriptor(@NotNull XmlTag tag) {
     XmlElementDescriptor elementDescriptor = super.getElementDescriptor(tag);
 
+    LOG.debug("Descriptor from rng for tag " +
+              tag.getName() +
+              " is " +
+              (elementDescriptor != null ? elementDescriptor.getClass().getCanonicalName() : "NULL"));
+
     String namespace;
     if (elementDescriptor == null &&
         !((namespace = tag.getNamespace()).equals(XmlUtil.XHTML_URI))) {