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A packaging of the IntelliJ Community Edition xml-psi-impl library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.intellij.psi.impl.source.xml;

import com.intellij.ide.util.PsiNavigationSupport;
import com.intellij.pom.Navigatable;
import com.intellij.psi.*;
import com.intellij.psi.impl.source.resolve.reference.ReferenceProvidersRegistry;
import com.intellij.psi.impl.source.tree.LeafPsiElement;
import com.intellij.psi.search.PsiElementProcessor;
import com.intellij.psi.tree.IElementType;
import com.intellij.psi.tree.xml.IDTDElementType;
import com.intellij.psi.xml.XmlToken;
import com.intellij.psi.xml.XmlTokenType;
import org.jetbrains.annotations.NotNull;

/**
 * @author ik
 */
public class XmlTokenImpl extends LeafPsiElement implements XmlToken, Navigatable {
  public XmlTokenImpl(@NotNull IElementType type, CharSequence text) {
    super(type, text);
  }

  @Override
  public boolean processElements(PsiElementProcessor processor, PsiElement place) {
    return false;
  }

  @Override
  public void accept(@NotNull PsiElementVisitor visitor) {
    if (visitor instanceof XmlElementVisitor) {
      ((XmlElementVisitor)visitor).visitXmlToken(this);
    }
    else {
      visitor.visitElement(this);
    }
  }

  public String toString() {
    if(getTokenType() instanceof IDTDElementType){
      return "DTDToken:" + getTokenType().toString();
    }
    return "XmlToken:" + getTokenType().toString();
  }

// Implementation specific

  @Override
  public IElementType getTokenType() {
    return getElementType();
  }

  @Override
  @NotNull
  public PsiReference[] getReferences() {
    final IElementType elementType = getElementType();

    if (elementType == XmlTokenType.XML_DATA_CHARACTERS ||
        elementType == XmlTokenType.XML_CHAR_ENTITY_REF) {
      return ReferenceProvidersRegistry.getReferencesFromProviders(this);
    } else if (elementType == XmlTokenType.XML_NAME && getParent() instanceof PsiErrorElement) {
      final PsiElement element = getPrevSibling();
      
      if (element instanceof XmlToken && ((XmlToken)element).getTokenType() == XmlTokenType.XML_END_TAG_START) {
        return new PsiReference[] {TagNameReference.createTagNameReference(this, getNode(), false)};
      }
    }

    return super.getReferences();
  }

  @Override
  public void navigate(boolean requestFocus) {
    Navigatable descriptor = PsiNavigationSupport.getInstance().getDescriptor(this);
    if (descriptor != null) {
      descriptor.navigate(requestFocus);
    }
  }

  @Override
  public boolean canNavigate() {
    return getTokenType() == XmlTokenType.XML_NAME && PsiNavigationSupport.getInstance().canNavigate(this);
  }

  @Override
  public boolean canNavigateToSource() {
    return canNavigate();
  }
}