xml/xml-psi-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/manipulators/XmlAttributeManipulator.java

/*
 * 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.resolve.reference.impl.manipulators;

import com.intellij.lang.ASTNode;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.AbstractElementManipulator;
import com.intellij.psi.PsiElement;
import com.intellij.psi.xml.XmlAttribute;
import com.intellij.psi.xml.XmlAttributeValue;
import com.intellij.psi.xml.XmlChildRole;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;

/**
 * @author Gregory.Shrago
 */
public class XmlAttributeManipulator extends AbstractElementManipulator<XmlAttribute> {

  private static final Logger LOG = Logger.getInstance(XmlAttributeManipulator.class);

  @Override
  public XmlAttribute handleContentChange(@NotNull XmlAttribute attribute, @NotNull TextRange range, String newContent) throws IncorrectOperationException {
    String attr = attribute.getText();
    ASTNode astNode = XmlChildRole.ATTRIBUTE_NAME_FINDER.findChild(attribute.getNode());
    assert astNode != null;
    PsiElement namePsi = astNode.getPsi();
    int startOffsetInParent = namePsi.getStartOffsetInParent();
    TextRange nameRange = new TextRange(startOffsetInParent, startOffsetInParent + namePsi.getTextLength());

    if (nameRange.contains(range)) {
      String content = attr.substring(0, range.getStartOffset()) + newContent + attr.substring(range.getEndOffset(), nameRange.getEndOffset());

      attribute.setName(content);
    } else {
      final XmlAttributeValue value = attribute.getValueElement();

      if (value == null) {
        assert range.getStartOffset() == 0 && range.getEndOffset() == 0;
        attribute.setValue(newContent);
        return attribute;
      }
      final StringBuilder replacement = new StringBuilder(value.getText());
      int offset = value.getTextRange().getStartOffset() - attribute.getTextRange().getStartOffset();

      replacement.replace(
        range.getStartOffset() - offset,
        range.getEndOffset() - offset,
        newContent
      );
      attribute.setValue(replacement.toString());
    }
    return attribute;
  }

  @Override
  @NotNull
  public TextRange getRangeInElement(@NotNull final XmlAttribute attribute) {
    final XmlAttributeValue value = attribute.getValueElement();
    if (value == null) return TextRange.from(0, 0);
    TextRange range = attribute.getValueTextRange();
    if (range == null) {
      LOG.error("Null range in " + attribute + " '" + attribute.getText() + "'");
    }
    return range.shiftRight(value.getStartOffsetInParent());
  }
}