java/java-psi-impl/src/com/intellij/codeInsight/JavaPsiEquivalenceUtil.java

/*
 * Copyright 2000-2013 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.codeInsight;

import com.intellij.psi.*;
import com.intellij.psi.impl.source.PsiDiamondTypeElementImpl;
import com.intellij.psi.util.PsiTreeUtil;

import java.util.Comparator;

public class JavaPsiEquivalenceUtil {
  public static boolean areExpressionsEquivalent(PsiExpression expr1, PsiExpression expr2) {
    return PsiEquivalenceUtil.areElementsEquivalent(expr1, expr2, new Comparator<PsiElement>() {
      @Override
      public int compare(PsiElement o1, PsiElement o2) {
        if (o1 instanceof PsiParameter && o2 instanceof PsiParameter) {
          final PsiElement scope1 = ((PsiParameter)o1).getDeclarationScope();
          final PsiElement scope2 = ((PsiParameter)o2).getDeclarationScope();
          if (scope1 instanceof PsiMethod && scope2 instanceof PsiMethod ||
              scope1 instanceof PsiLambdaExpression && scope2 instanceof PsiLambdaExpression) {
            if (!scope1.getTextRange().intersects(scope2.getTextRange())) {
              return ((PsiParameter)o1).getName().compareTo(((PsiParameter)o2).getName());
            }
          }
        }
        return 1;
      }
    }, new Comparator<PsiElement>() {
        @Override
        public int compare(PsiElement o1, PsiElement o2) {
          if (!o1.textMatches(o2)) return 1;

          if (o1 instanceof PsiDiamondTypeElementImpl && o2 instanceof PsiDiamondTypeElementImpl) {
            final PsiDiamondType.DiamondInferenceResult thisInferenceResult = new PsiDiamondTypeImpl(o1.getManager(), (PsiTypeElement)o1).resolveInferredTypes();
            final PsiDiamondType.DiamondInferenceResult otherInferenceResult = new PsiDiamondTypeImpl(o2.getManager(), (PsiTypeElement)o2).resolveInferredTypes();
            return thisInferenceResult.equals(otherInferenceResult) ? 0 : 1;
          }
          return 0;
        }
      }, null, false);
  }
}