| /* |
| * Copyright 2003-2014 Dave Griffith, Bas Leijdekkers |
| * |
| * 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.siyeh.ipp.opassign; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.tree.IElementType; |
| import com.intellij.psi.util.PsiUtil; |
| import com.siyeh.ig.psiutils.EquivalenceChecker; |
| import com.siyeh.ig.psiutils.SideEffectChecker; |
| import com.siyeh.ipp.base.PsiElementPredicate; |
| import com.siyeh.ipp.psiutils.ErrorUtil; |
| |
| class ReplaceableWithOperatorAssignmentPredicate implements PsiElementPredicate { |
| |
| public boolean satisfiedBy(PsiElement element) { |
| if (!(element instanceof PsiAssignmentExpression)) { |
| return false; |
| } |
| final PsiAssignmentExpression assignment = (PsiAssignmentExpression)element; |
| final IElementType tokenType = assignment.getOperationTokenType(); |
| if (!JavaTokenType.EQ.equals(tokenType)) { |
| return false; |
| } |
| final PsiExpression rhs = assignment.getRExpression(); |
| final PsiExpression expression = PsiUtil.deparenthesizeExpression(rhs); |
| if (!(expression instanceof PsiPolyadicExpression)) { |
| return false; |
| } |
| final PsiPolyadicExpression polyadicExpression = (PsiPolyadicExpression)expression; |
| final PsiExpression[] operands = polyadicExpression.getOperands(); |
| if (operands.length < 2) { |
| return false; |
| } |
| final IElementType rhsTokenType = polyadicExpression.getOperationTokenType(); |
| if (JavaTokenType.OROR.equals(rhsTokenType) || JavaTokenType.ANDAND.equals(rhsTokenType) || |
| JavaTokenType.EQEQ.equals(rhsTokenType) || JavaTokenType.NE.equals(rhsTokenType)) { |
| return false; |
| } |
| final PsiExpression lhs = assignment.getLExpression(); |
| if (SideEffectChecker.mayHaveSideEffects(lhs)) { |
| return false; |
| } |
| if (!EquivalenceChecker.expressionsAreEquivalent(lhs, operands[0])) { |
| return false; |
| } |
| return !ErrorUtil.containsError(element); |
| } |
| } |