xml/xml-psi-impl/src/com/intellij/psi/impl/source/xml/XmlAttributeImpl.java - platform/tools/idea - Git at Google

 /*
  * 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.lang.ASTNode;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.util.TextRange;
 import com.intellij.pom.PomManager;
 import com.intellij.pom.PomModel;
 import com.intellij.pom.event.PomModelEvent;
 import com.intellij.pom.impl.PomTransactionBase;
 import com.intellij.pom.xml.XmlAspect;
 import com.intellij.pom.xml.impl.XmlAspectChangeSetImpl;
 import com.intellij.pom.xml.impl.events.XmlAttributeSetImpl;
 import com.intellij.psi.*;
 import com.intellij.psi.impl.source.codeStyle.CodeEditUtil;
 import com.intellij.psi.impl.source.resolve.reference.ReferenceProvidersRegistry;
 import com.intellij.psi.tree.ChildRoleBase;
 import com.intellij.psi.tree.IElementType;
 import com.intellij.psi.xml.*;
 import com.intellij.util.ArrayUtil;
 import com.intellij.util.IncorrectOperationException;
 import com.intellij.xml.XmlAttributeDescriptor;
 import com.intellij.xml.XmlElementDescriptor;
 import com.intellij.xml.util.XmlUtil;
 import gnu.trove.TIntArrayList;
 import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;

 import java.util.Arrays;

 import static com.intellij.codeInsight.completion.CompletionUtilCore.DUMMY_IDENTIFIER_TRIMMED;

 /**
  * @author Mike
  */
 public class XmlAttributeImpl extends XmlElementImpl implements XmlAttribute {
   private static final Logger LOG = Logger.getInstance("#com.intellij.psi.impl.source.xml.XmlAttributeImpl");

   private final int myHC = ourHC++;

   @Override
   public final int hashCode() {
     return myHC;
   }

   public XmlAttributeImpl() {
     super(XmlElementType.XML_ATTRIBUTE);
   }

   @Override
   public int getChildRole(ASTNode child) {
     LOG.assertTrue(child.getTreeParent() == this);
     IElementType i = child.getElementType();
     if (i == XmlTokenType.XML_NAME) {
       return XmlChildRole.XML_NAME;
     }
     else if (i == XmlElementType.XML_ATTRIBUTE_VALUE) {
       return XmlChildRole.XML_ATTRIBUTE_VALUE;
     }
     else {
       return ChildRoleBase.NONE;
     }
   }

   @Override
   public XmlAttributeValue getValueElement() {
     return (XmlAttributeValue)XmlChildRole.ATTRIBUTE_VALUE_FINDER.findChild(this);
   }

   @Override
   public void setValue(String valueText) throws IncorrectOperationException {
     final ASTNode value = XmlChildRole.ATTRIBUTE_VALUE_FINDER.findChild(this);
     final PomModel model = PomManager.getModel(getProject());
     final XmlAttribute attribute = XmlElementFactory.getInstance(getProject()).createXmlAttribute("a", valueText);
     final ASTNode newValue = XmlChildRole.ATTRIBUTE_VALUE_FINDER.findChild((ASTNode)attribute);
     final XmlAspect aspect = model.getModelAspect(XmlAspect.class);
     model.runTransaction(new PomTransactionBase(this, aspect) {
       @Override
       public PomModelEvent runInner() {
         final XmlAttributeImpl att = XmlAttributeImpl.this;
         if (value != null) {
           if (newValue != null) {
             att.replaceChild(value, newValue.copyElement());
           }
           else {
             att.removeChild(value);
           }
         }
         else {
           if (newValue != null) {
             att.addChild(newValue.copyElement());
           }
         }
         return XmlAttributeSetImpl.createXmlAttributeSet(model, getParent(), getName(), newValue != null ? newValue.getText() : null);
       }
     });
   }

   @Override
   public XmlElement getNameElement() {
     return (XmlElement)XmlChildRole.ATTRIBUTE_NAME_FINDER.findChild(this);
   }

   @Override
   @NotNull
   public String getNamespace() {
     final String name = getName();
     final String prefixByQualifiedName = XmlUtil.findPrefixByQualifiedName(name);
     // The namespace name for an unprefixed attribute name always has no value. Namespace recommendation section 6.2, third paragraph
     if (prefixByQualifiedName.isEmpty()) return XmlUtil.EMPTY_URI;
     return getParent().getNamespaceByPrefix(prefixByQualifiedName);
   }

   @Override
   @NonNls
   @NotNull
   public String getNamespacePrefix() {
     return XmlUtil.findPrefixByQualifiedName(getName());
   }

   @Override
   public XmlTag getParent() {
     final PsiElement parentTag = super.getParent();
     return parentTag instanceof XmlTag ? (XmlTag)parentTag : null; // Invalid elements might belong to DummyHolder instead.
   }

   @Override
   @NotNull
   public String getLocalName() {
     return XmlUtil.findLocalNameByQualifiedName(getName());
   }

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

   @Override
   public String getValue() {
     final XmlAttributeValue valueElement = getValueElement();
     return valueElement != null ? valueElement.getValue() : null;
   }

   private volatile String myDisplayText = null;
   private volatile int[] myGapDisplayStarts = null;
   private volatile int[] myGapPhysicalStarts = null;
   private volatile TextRange myValueTextRange; // text inside quotes, if there are any

   protected void appendChildToDisplayValue(StringBuilder buffer, ASTNode child) {
     buffer.append(child.getChars());
   }

   @Override
   public String getDisplayValue() {
     String displayText = myDisplayText;
     if (displayText != null) return displayText;
     XmlAttributeValue value = getValueElement();
     if (value == null) return null;
     PsiElement firstChild = value.getFirstChild();
     if (firstChild == null) return null;
     ASTNode child = firstChild.getNode();
     TextRange valueTextRange = new TextRange(0, value.getTextLength());
     if (child != null && child.getElementType() == XmlTokenType.XML_ATTRIBUTE_VALUE_START_DELIMITER) {
       valueTextRange = new TextRange(child.getTextLength(), valueTextRange.getEndOffset());
       child = child.getTreeNext();
     }
     final TIntArrayList gapsStarts = new TIntArrayList();
     final TIntArrayList gapsShifts = new TIntArrayList();
     StringBuilder buffer = new StringBuilder(getTextLength());
     while (child != null) {
       final int start = buffer.length();
       IElementType elementType = child.getElementType();
       if (elementType == XmlTokenType.XML_ATTRIBUTE_VALUE_END_DELIMITER) {
         valueTextRange =
           new TextRange(valueTextRange.getStartOffset(), child.getTextRange().getStartOffset() - value.getTextRange().getStartOffset());
         break;
       }
       if (elementType == XmlTokenType.XML_CHAR_ENTITY_REF) {
         buffer.append(XmlUtil.getCharFromEntityRef(child.getText()));
       }
       else if (elementType == XmlElementType.XML_ENTITY_REF) {
         buffer.append(XmlUtil.getEntityValue((XmlEntityRef)child));
       }
       else {
         appendChildToDisplayValue(buffer, child);
       }

       int end = buffer.length();
       int originalLength = child.getTextLength();
       if (end - start != originalLength) {
         gapsStarts.add(start);
         gapsShifts.add(originalLength - (end - start));
       }
       child = child.getTreeNext();
     }
     int[] gapDisplayStarts = ArrayUtil.newIntArray(gapsShifts.size());
     int[] gapPhysicalStarts = ArrayUtil.newIntArray(gapsShifts.size());
     int currentGapsSum = 0;
     for (int i = 0; i < gapDisplayStarts.length; i++) {
       currentGapsSum += gapsShifts.get(i);
       gapDisplayStarts[i] = gapsStarts.get(i);
       gapPhysicalStarts[i] = gapDisplayStarts[i] + currentGapsSum;
     }
     myGapDisplayStarts = gapDisplayStarts;
     myGapPhysicalStarts = gapPhysicalStarts;
     myValueTextRange = valueTextRange;
     return myDisplayText = buffer.toString();
   }

   @Override
   public int physicalToDisplay(int physicalIndex) {
     getDisplayValue();
     if (physicalIndex < 0 || physicalIndex > myValueTextRange.getLength()) return -1;
     if (myGapPhysicalStarts.length == 0) return physicalIndex;

     final int bsResult = Arrays.binarySearch(myGapPhysicalStarts, physicalIndex);

     final int gapIndex;
     if (bsResult > 0) {
       gapIndex = bsResult;
     }
     else if (bsResult < -1) {
       gapIndex = -bsResult - 2;
     }
     else {
       gapIndex = -1;
     }

     if (gapIndex < 0) return physicalIndex;
     final int shift = myGapPhysicalStarts[gapIndex] - myGapDisplayStarts[gapIndex];
     return Math.max(myGapDisplayStarts[gapIndex], physicalIndex - shift);
   }

   @Override
   public int displayToPhysical(int displayIndex) {
     String displayValue = getDisplayValue();
     if (displayValue == null || displayIndex < 0 || displayIndex > displayValue.length()) return -1;
     if (myGapDisplayStarts.length == 0) return displayIndex;

     final int bsResult = Arrays.binarySearch(myGapDisplayStarts, displayIndex);
     final int gapIndex;

     if (bsResult > 0) {
       gapIndex = bsResult - 1;
     }
     else if (bsResult < -1) {
       gapIndex = -bsResult - 2;
     }
     else {
       gapIndex = -1;
     }

     if (gapIndex < 0) return displayIndex;
     final int shift = myGapPhysicalStarts[gapIndex] - myGapDisplayStarts[gapIndex];
     return displayIndex + shift;
   }

   @NotNull
   @Override
   public TextRange getValueTextRange() {
     getDisplayValue();
     return myValueTextRange;
   }

   @Override
   public void clearCaches() {
     super.clearCaches();
     myDisplayText = null;
     myGapDisplayStarts = null;
     myGapPhysicalStarts = null;
     myValueTextRange = null;
   }

   @Override
   @NotNull
   public String getName() {
     XmlElement element = getNameElement();
     return element != null ? element.getText() : "";
   }

   @Override
   public boolean isNamespaceDeclaration() {
     @NonNls final String name = getName();
     return name.startsWith("xmlns:") || name.equals("xmlns");
   }

   @Override
   public PsiElement setName(@NotNull final String nameText) throws IncorrectOperationException {
     final ASTNode name = XmlChildRole.ATTRIBUTE_NAME_FINDER.findChild(this);
     final String oldName = name.getText();
     final PomModel model = PomManager.getModel(getProject());
     final XmlAttribute attribute = XmlElementFactory.getInstance(getProject()).createXmlAttribute(nameText, "");
     final ASTNode newName = XmlChildRole.ATTRIBUTE_NAME_FINDER.findChild((ASTNode)attribute);
     final XmlAspect aspect = model.getModelAspect(XmlAspect.class);
     model.runTransaction(new PomTransactionBase(getParent(), aspect) {
       @Override
       public PomModelEvent runInner() {
         final PomModelEvent event = new PomModelEvent(model);
         final XmlAspectChangeSetImpl xmlAspectChangeSet = new XmlAspectChangeSetImpl(model, (XmlFile)getContainingFile());
         xmlAspectChangeSet.add(new XmlAttributeSetImpl(getParent(), oldName, null));
         xmlAspectChangeSet.add(new XmlAttributeSetImpl(getParent(), nameText, getValue()));
         event.registerChangeSet(model.getModelAspect(XmlAspect.class), xmlAspectChangeSet);
         CodeEditUtil.replaceChild(XmlAttributeImpl.this, name, newName);
         return event;
       }
     });
     return this;
   }

   @Override
   public PsiReference getReference() {
     final PsiReference[] refs = getReferences();
     if (refs.length > 0) return refs[0];
     return null;
   }

   @Override
   @NotNull
   public PsiReference[] getReferences() {
     final PsiReference[] referencesFromProviders = ReferenceProvidersRegistry.getReferencesFromProviders(this);
     if (referencesFromProviders == null) return new PsiReference[]{new XmlAttributeReference(this)};
     PsiReference[] refs;
     if (isNamespaceDeclaration()) {
       refs = new PsiReference[referencesFromProviders.length + 1];
       final String localName = getLocalName();
       final String prefix = XmlUtil.findPrefixByQualifiedName(getName());
       final TextRange range =
         prefix.isEmpty() ? TextRange.from(getName().length(), 0) : TextRange.from(prefix.length() + 1, localName.length());
       refs[0] = new SchemaPrefixReference(this, range, localName, null);
     }
     else {
       final String prefix = getNamespacePrefix();
       if (!prefix.isEmpty() && !getLocalName().isEmpty()) {
         refs = new PsiReference[referencesFromProviders.length + 2];
         refs[0] = new SchemaPrefixReference(this, TextRange.from(0, prefix.length()), prefix, null);
         refs[1] = new XmlAttributeReference(this);
       }
       else {
         refs = new PsiReference[referencesFromProviders.length + 1];
         refs[0] = new XmlAttributeReference(this);
       }
     }
     System.arraycopy(referencesFromProviders, 0, refs, refs.length - referencesFromProviders.length, referencesFromProviders.length);
     return refs;
   }

   @Override
   @Nullable
   public XmlAttributeDescriptor getDescriptor() {
     final PsiElement parentElement = getParent();
     if (parentElement instanceof XmlDecl) return null;
     final XmlTag tag = (XmlTag)parentElement;
     final XmlElementDescriptor descr = tag.getDescriptor();
     if (descr == null) return null;
     final XmlAttributeDescriptor attributeDescr = descr.getAttributeDescriptor(this);
     return attributeDescr == null ? descr.getAttributeDescriptor(getName(), tag) : attributeDescr;
   }

   public String getRealLocalName() {
     final String name = getLocalName();
     return name.endsWith(DUMMY_IDENTIFIER_TRIMMED) ? name.substring(0, name.length() - DUMMY_IDENTIFIER_TRIMMED.length()) : name;
   }
 }
	/*
	* 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.lang.ASTNode;
	import com.intellij.openapi.diagnostic.Logger;
	import com.intellij.openapi.util.TextRange;
	import com.intellij.pom.PomManager;
	import com.intellij.pom.PomModel;
	import com.intellij.pom.event.PomModelEvent;
	import com.intellij.pom.impl.PomTransactionBase;
	import com.intellij.pom.xml.XmlAspect;
	import com.intellij.pom.xml.impl.XmlAspectChangeSetImpl;
	import com.intellij.pom.xml.impl.events.XmlAttributeSetImpl;
	import com.intellij.psi.*;
	import com.intellij.psi.impl.source.codeStyle.CodeEditUtil;
	import com.intellij.psi.impl.source.resolve.reference.ReferenceProvidersRegistry;
	import com.intellij.psi.tree.ChildRoleBase;
	import com.intellij.psi.tree.IElementType;
	import com.intellij.psi.xml.*;
	import com.intellij.util.ArrayUtil;
	import com.intellij.util.IncorrectOperationException;
	import com.intellij.xml.XmlAttributeDescriptor;
	import com.intellij.xml.XmlElementDescriptor;
	import com.intellij.xml.util.XmlUtil;
	import gnu.trove.TIntArrayList;
	import org.jetbrains.annotations.NonNls;
	import org.jetbrains.annotations.NotNull;
	import org.jetbrains.annotations.Nullable;

	import java.util.Arrays;

	import static com.intellij.codeInsight.completion.CompletionUtilCore.DUMMY_IDENTIFIER_TRIMMED;

	/**
	* @author Mike
	*/
	public class XmlAttributeImpl extends XmlElementImpl implements XmlAttribute {
	private static final Logger LOG = Logger.getInstance("#com.intellij.psi.impl.source.xml.XmlAttributeImpl");

	private final int myHC = ourHC++;

	@Override
	public final int hashCode() {
	return myHC;
	}

	public XmlAttributeImpl() {
	super(XmlElementType.XML_ATTRIBUTE);
	}

	@Override
	public int getChildRole(ASTNode child) {
	LOG.assertTrue(child.getTreeParent() == this);
	IElementType i = child.getElementType();
	if (i == XmlTokenType.XML_NAME) {
	return XmlChildRole.XML_NAME;
	}
	else if (i == XmlElementType.XML_ATTRIBUTE_VALUE) {
	return XmlChildRole.XML_ATTRIBUTE_VALUE;
	}
	else {
	return ChildRoleBase.NONE;
	}
	}

	@Override
	public XmlAttributeValue getValueElement() {
	return (XmlAttributeValue)XmlChildRole.ATTRIBUTE_VALUE_FINDER.findChild(this);
	}

	@Override
	public void setValue(String valueText) throws IncorrectOperationException {
	final ASTNode value = XmlChildRole.ATTRIBUTE_VALUE_FINDER.findChild(this);
	final PomModel model = PomManager.getModel(getProject());
	final XmlAttribute attribute = XmlElementFactory.getInstance(getProject()).createXmlAttribute("a", valueText);
	final ASTNode newValue = XmlChildRole.ATTRIBUTE_VALUE_FINDER.findChild((ASTNode)attribute);
	final XmlAspect aspect = model.getModelAspect(XmlAspect.class);
	model.runTransaction(new PomTransactionBase(this, aspect) {
	@Override
	public PomModelEvent runInner() {
	final XmlAttributeImpl att = XmlAttributeImpl.this;
	if (value != null) {
	if (newValue != null) {
	att.replaceChild(value, newValue.copyElement());
	}
	else {
	att.removeChild(value);
	}
	}
	else {
	if (newValue != null) {
	att.addChild(newValue.copyElement());
	}
	}
	return XmlAttributeSetImpl.createXmlAttributeSet(model, getParent(), getName(), newValue != null ? newValue.getText() : null);
	}
	});
	}

	@Override
	public XmlElement getNameElement() {
	return (XmlElement)XmlChildRole.ATTRIBUTE_NAME_FINDER.findChild(this);
	}

	@Override
	@NotNull
	public String getNamespace() {
	final String name = getName();
	final String prefixByQualifiedName = XmlUtil.findPrefixByQualifiedName(name);
	// The namespace name for an unprefixed attribute name always has no value. Namespace recommendation section 6.2, third paragraph
	if (prefixByQualifiedName.isEmpty()) return XmlUtil.EMPTY_URI;
	return getParent().getNamespaceByPrefix(prefixByQualifiedName);
	}

	@Override
	@NonNls
	@NotNull
	public String getNamespacePrefix() {
	return XmlUtil.findPrefixByQualifiedName(getName());
	}

	@Override
	public XmlTag getParent() {
	final PsiElement parentTag = super.getParent();
	return parentTag instanceof XmlTag ? (XmlTag)parentTag : null; // Invalid elements might belong to DummyHolder instead.
	}

	@Override
	@NotNull
	public String getLocalName() {
	return XmlUtil.findLocalNameByQualifiedName(getName());
	}

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

	@Override
	public String getValue() {
	final XmlAttributeValue valueElement = getValueElement();
	return valueElement != null ? valueElement.getValue() : null;
	}

	private volatile String myDisplayText = null;
	private volatile int[] myGapDisplayStarts = null;
	private volatile int[] myGapPhysicalStarts = null;
	private volatile TextRange myValueTextRange; // text inside quotes, if there are any

	protected void appendChildToDisplayValue(StringBuilder buffer, ASTNode child) {
	buffer.append(child.getChars());
	}

	@Override
	public String getDisplayValue() {
	String displayText = myDisplayText;
	if (displayText != null) return displayText;
	XmlAttributeValue value = getValueElement();
	if (value == null) return null;
	PsiElement firstChild = value.getFirstChild();
	if (firstChild == null) return null;
	ASTNode child = firstChild.getNode();
	TextRange valueTextRange = new TextRange(0, value.getTextLength());
	if (child != null && child.getElementType() == XmlTokenType.XML_ATTRIBUTE_VALUE_START_DELIMITER) {
	valueTextRange = new TextRange(child.getTextLength(), valueTextRange.getEndOffset());
	child = child.getTreeNext();
	}
	final TIntArrayList gapsStarts = new TIntArrayList();
	final TIntArrayList gapsShifts = new TIntArrayList();
	StringBuilder buffer = new StringBuilder(getTextLength());
	while (child != null) {
	final int start = buffer.length();
	IElementType elementType = child.getElementType();
	if (elementType == XmlTokenType.XML_ATTRIBUTE_VALUE_END_DELIMITER) {
	valueTextRange =
	new TextRange(valueTextRange.getStartOffset(), child.getTextRange().getStartOffset() - value.getTextRange().getStartOffset());
	break;
	}
	if (elementType == XmlTokenType.XML_CHAR_ENTITY_REF) {
	buffer.append(XmlUtil.getCharFromEntityRef(child.getText()));
	}
	else if (elementType == XmlElementType.XML_ENTITY_REF) {
	buffer.append(XmlUtil.getEntityValue((XmlEntityRef)child));
	}
	else {
	appendChildToDisplayValue(buffer, child);
	}

	int end = buffer.length();
	int originalLength = child.getTextLength();
	if (end - start != originalLength) {
	gapsStarts.add(start);
	gapsShifts.add(originalLength - (end - start));
	}
	child = child.getTreeNext();
	}
	int[] gapDisplayStarts = ArrayUtil.newIntArray(gapsShifts.size());
	int[] gapPhysicalStarts = ArrayUtil.newIntArray(gapsShifts.size());
	int currentGapsSum = 0;
	for (int i = 0; i < gapDisplayStarts.length; i++) {
	currentGapsSum += gapsShifts.get(i);
	gapDisplayStarts[i] = gapsStarts.get(i);
	gapPhysicalStarts[i] = gapDisplayStarts[i] + currentGapsSum;
	}
	myGapDisplayStarts = gapDisplayStarts;
	myGapPhysicalStarts = gapPhysicalStarts;
	myValueTextRange = valueTextRange;
	return myDisplayText = buffer.toString();
	}

	@Override
	public int physicalToDisplay(int physicalIndex) {
	getDisplayValue();
	if (physicalIndex < 0 \|\| physicalIndex > myValueTextRange.getLength()) return -1;
	if (myGapPhysicalStarts.length == 0) return physicalIndex;

	final int bsResult = Arrays.binarySearch(myGapPhysicalStarts, physicalIndex);

	final int gapIndex;
	if (bsResult > 0) {
	gapIndex = bsResult;
	}
	else if (bsResult < -1) {
	gapIndex = -bsResult - 2;
	}
	else {
	gapIndex = -1;
	}

	if (gapIndex < 0) return physicalIndex;
	final int shift = myGapPhysicalStarts[gapIndex] - myGapDisplayStarts[gapIndex];
	return Math.max(myGapDisplayStarts[gapIndex], physicalIndex - shift);
	}

	@Override
	public int displayToPhysical(int displayIndex) {
	String displayValue = getDisplayValue();
	if (displayValue == null \|\| displayIndex < 0 \|\| displayIndex > displayValue.length()) return -1;
	if (myGapDisplayStarts.length == 0) return displayIndex;

	final int bsResult = Arrays.binarySearch(myGapDisplayStarts, displayIndex);
	final int gapIndex;

	if (bsResult > 0) {
	gapIndex = bsResult - 1;
	}
	else if (bsResult < -1) {
	gapIndex = -bsResult - 2;
	}
	else {
	gapIndex = -1;
	}

	if (gapIndex < 0) return displayIndex;
	final int shift = myGapPhysicalStarts[gapIndex] - myGapDisplayStarts[gapIndex];
	return displayIndex + shift;
	}

	@NotNull
	@Override
	public TextRange getValueTextRange() {
	getDisplayValue();
	return myValueTextRange;
	}

	@Override
	public void clearCaches() {
	super.clearCaches();
	myDisplayText = null;
	myGapDisplayStarts = null;
	myGapPhysicalStarts = null;
	myValueTextRange = null;
	}

	@Override
	@NotNull
	public String getName() {
	XmlElement element = getNameElement();
	return element != null ? element.getText() : "";
	}

	@Override
	public boolean isNamespaceDeclaration() {
	@NonNls final String name = getName();
	return name.startsWith("xmlns:") \|\| name.equals("xmlns");
	}

	@Override
	public PsiElement setName(@NotNull final String nameText) throws IncorrectOperationException {
	final ASTNode name = XmlChildRole.ATTRIBUTE_NAME_FINDER.findChild(this);
	final String oldName = name.getText();
	final PomModel model = PomManager.getModel(getProject());
	final XmlAttribute attribute = XmlElementFactory.getInstance(getProject()).createXmlAttribute(nameText, "");
	final ASTNode newName = XmlChildRole.ATTRIBUTE_NAME_FINDER.findChild((ASTNode)attribute);
	final XmlAspect aspect = model.getModelAspect(XmlAspect.class);
	model.runTransaction(new PomTransactionBase(getParent(), aspect) {
	@Override
	public PomModelEvent runInner() {
	final PomModelEvent event = new PomModelEvent(model);
	final XmlAspectChangeSetImpl xmlAspectChangeSet = new XmlAspectChangeSetImpl(model, (XmlFile)getContainingFile());
	xmlAspectChangeSet.add(new XmlAttributeSetImpl(getParent(), oldName, null));
	xmlAspectChangeSet.add(new XmlAttributeSetImpl(getParent(), nameText, getValue()));
	event.registerChangeSet(model.getModelAspect(XmlAspect.class), xmlAspectChangeSet);
	CodeEditUtil.replaceChild(XmlAttributeImpl.this, name, newName);
	return event;
	}
	});
	return this;
	}

	@Override
	public PsiReference getReference() {
	final PsiReference[] refs = getReferences();
	if (refs.length > 0) return refs[0];
	return null;
	}

	@Override
	@NotNull
	public PsiReference[] getReferences() {
	final PsiReference[] referencesFromProviders = ReferenceProvidersRegistry.getReferencesFromProviders(this);
	if (referencesFromProviders == null) return new PsiReference[]{new XmlAttributeReference(this)};
	PsiReference[] refs;
	if (isNamespaceDeclaration()) {
	refs = new PsiReference[referencesFromProviders.length + 1];
	final String localName = getLocalName();
	final String prefix = XmlUtil.findPrefixByQualifiedName(getName());
	final TextRange range =
	prefix.isEmpty() ? TextRange.from(getName().length(), 0) : TextRange.from(prefix.length() + 1, localName.length());
	refs[0] = new SchemaPrefixReference(this, range, localName, null);
	}
	else {
	final String prefix = getNamespacePrefix();
	if (!prefix.isEmpty() && !getLocalName().isEmpty()) {
	refs = new PsiReference[referencesFromProviders.length + 2];
	refs[0] = new SchemaPrefixReference(this, TextRange.from(0, prefix.length()), prefix, null);
	refs[1] = new XmlAttributeReference(this);
	}
	else {
	refs = new PsiReference[referencesFromProviders.length + 1];
	refs[0] = new XmlAttributeReference(this);
	}
	}
	System.arraycopy(referencesFromProviders, 0, refs, refs.length - referencesFromProviders.length, referencesFromProviders.length);
	return refs;
	}

	@Override
	@Nullable
	public XmlAttributeDescriptor getDescriptor() {
	final PsiElement parentElement = getParent();
	if (parentElement instanceof XmlDecl) return null;
	final XmlTag tag = (XmlTag)parentElement;
	final XmlElementDescriptor descr = tag.getDescriptor();
	if (descr == null) return null;
	final XmlAttributeDescriptor attributeDescr = descr.getAttributeDescriptor(this);
	return attributeDescr == null ? descr.getAttributeDescriptor(getName(), tag) : attributeDescr;
	}

	public String getRealLocalName() {
	final String name = getLocalName();
	return name.endsWith(DUMMY_IDENTIFIER_TRIMMED) ? name.substring(0, name.length() - DUMMY_IDENTIFIER_TRIMMED.length()) : name;
	}
	}