/*
 * Copyright 2011-present Greg Shrago
 *
 * 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 org.intellij.grammar.psi.impl;

import com.intellij.lang.ASTNode;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiReference;
import com.intellij.util.IncorrectOperationException;
import org.intellij.grammar.psi.BnfFile;
import org.intellij.grammar.psi.BnfReferenceOrToken;
import org.intellij.grammar.psi.BnfRule;
import org.jetbrains.annotations.Nullable;

/**
 * Created by IntelliJ IDEA.
 * User: gregory
 * Date: 14.07.11
 * Time: 19:17
 */
public abstract class BnfRefOrTokenImpl extends BnfExpressionImpl implements BnfReferenceOrToken {
  public BnfRefOrTokenImpl(ASTNode node) {
    super(node);
  }

  @Nullable
  public BnfRule resolveRule() {
    PsiFile file = getContainingFile();
    return file instanceof BnfFile ? ((BnfFile)file).getRule(GrammarUtil.getIdText(getId())) : null;
  }

  @Override
  public PsiReference getReference() {
    int delta = GrammarUtil.isIdQuoted(getId().getText()) ? 1 : 0;
    TextRange range = TextRange.create(delta, getTextLength() - delta);
    return new BnfReferenceImpl<BnfReferenceOrToken>(this, range) {
      @Override
      public PsiElement handleElementRename(String newElementName) throws IncorrectOperationException {
        myElement.getId().replace(BnfElementFactory.createLeafFromText(getElement().getProject(), newElementName));
        return myElement;
      }
    };
  }

}