| /* |
| * 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.trivialif; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.siyeh.ig.psiutils.ControlFlowUtils; |
| import com.siyeh.ig.psiutils.EquivalenceChecker; |
| import com.siyeh.ipp.base.PsiElementPredicate; |
| import com.siyeh.ipp.psiutils.ErrorUtil; |
| |
| class MergeIfOrPredicate implements PsiElementPredicate { |
| |
| public boolean satisfiedBy(PsiElement element) { |
| return isMergableExplicitIf(element) || isMergableImplicitIf(element); |
| } |
| |
| public static boolean isMergableExplicitIf(PsiElement element) { |
| if (!(element instanceof PsiJavaToken)) { |
| return false; |
| } |
| final PsiJavaToken token = (PsiJavaToken)element; |
| final PsiElement parent = token.getParent(); |
| if (!(parent instanceof PsiIfStatement)) { |
| return false; |
| } |
| final PsiIfStatement ifStatement = (PsiIfStatement)parent; |
| final PsiStatement thenBranch = ifStatement.getThenBranch(); |
| final PsiStatement elseBranch = ifStatement.getElseBranch(); |
| if (thenBranch == null) { |
| return false; |
| } |
| if (elseBranch == null) { |
| return false; |
| } |
| if (!(elseBranch instanceof PsiIfStatement)) { |
| return false; |
| } |
| if (ErrorUtil.containsError(ifStatement)) { |
| return false; |
| } |
| final PsiIfStatement childIfStatement = (PsiIfStatement)elseBranch; |
| final PsiStatement childThenBranch = childIfStatement.getThenBranch(); |
| return EquivalenceChecker.statementsAreEquivalent(thenBranch, childThenBranch); |
| } |
| |
| private static boolean isMergableImplicitIf(PsiElement element) { |
| if (!(element instanceof PsiJavaToken)) { |
| return false; |
| } |
| final PsiJavaToken token = (PsiJavaToken)element; |
| |
| final PsiElement parent = token.getParent(); |
| if (!(parent instanceof PsiIfStatement)) { |
| return false; |
| } |
| final PsiIfStatement ifStatement = (PsiIfStatement)parent; |
| final PsiStatement thenBranch = ifStatement.getThenBranch(); |
| if (thenBranch == null) { |
| return false; |
| } |
| final PsiStatement elseBranch = ifStatement.getElseBranch(); |
| if (elseBranch != null) { |
| return false; |
| } |
| if (ControlFlowUtils.statementMayCompleteNormally(thenBranch)) { |
| return false; |
| } |
| final PsiElement nextStatement = PsiTreeUtil.skipSiblingsForward(ifStatement, PsiWhiteSpace.class); |
| if (!(nextStatement instanceof PsiIfStatement)) { |
| return false; |
| } |
| final PsiIfStatement nextIfStatement = (PsiIfStatement)nextStatement; |
| final PsiStatement nextThenBranch = nextIfStatement.getThenBranch(); |
| return EquivalenceChecker.statementsAreEquivalent(thenBranch, nextThenBranch); |
| } |
| } |