| /* |
| * Copyright 2000-2009 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.daemon.impl.quickfix; |
| |
| import com.intellij.codeInsight.FileModificationService; |
| import com.intellij.codeInsight.daemon.QuickFixBundle; |
| import com.intellij.codeInsight.intention.PsiElementBaseIntentionAction; |
| import com.intellij.openapi.diagnostic.Logger; |
| import com.intellij.openapi.editor.Editor; |
| import com.intellij.openapi.project.Project; |
| import com.intellij.psi.*; |
| import com.intellij.psi.controlFlow.*; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.intellij.util.IncorrectOperationException; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * @author ven |
| */ |
| public class RemoveRedundantElseAction extends PsiElementBaseIntentionAction { |
| private static final Logger LOG = Logger.getInstance("#com.intellij.codeInsight.daemon.impl.quickfix.RemoveRedundantElseAction"); |
| |
| @Override |
| @NotNull |
| public String getText() { |
| return QuickFixBundle.message("remove.redundant.else.fix"); |
| } |
| |
| @Override |
| @NotNull |
| public String getFamilyName() { |
| return QuickFixBundle.message("remove.redundant.else.fix"); |
| } |
| |
| @Override |
| public boolean isAvailable(@NotNull Project project, Editor editor, @NotNull PsiElement element) { |
| if (element instanceof PsiKeyword && |
| element.getParent() instanceof PsiIfStatement && |
| PsiKeyword.ELSE.equals(element.getText())) { |
| PsiIfStatement ifStatement = (PsiIfStatement)element.getParent(); |
| if (ifStatement.getElseBranch() == null) return false; |
| PsiStatement thenBranch = ifStatement.getThenBranch(); |
| if (thenBranch == null) return false; |
| PsiElement block = PsiTreeUtil.getParentOfType(ifStatement, PsiCodeBlock.class); |
| if (block != null) { |
| while (cantCompleteNormally(thenBranch, block)) { |
| thenBranch = getPrevThenBranch(thenBranch); |
| if (thenBranch == null) return true; |
| } |
| return false; |
| } |
| } |
| return false; |
| } |
| |
| @Nullable |
| private static PsiStatement getPrevThenBranch(@NotNull PsiElement thenBranch) { |
| final PsiElement ifStatement = thenBranch.getParent(); |
| final PsiElement parent = ifStatement.getParent(); |
| if (parent instanceof PsiIfStatement && ((PsiIfStatement)parent).getElseBranch() == ifStatement) { |
| return ((PsiIfStatement)parent).getThenBranch(); |
| } |
| return null; |
| } |
| |
| private static boolean cantCompleteNormally(@NotNull PsiStatement thenBranch, PsiElement block) { |
| try { |
| ControlFlow controlFlow = ControlFlowFactory.getInstance(thenBranch.getProject()).getControlFlow(block, LocalsOrMyInstanceFieldsControlFlowPolicy.getInstance()); |
| int startOffset = controlFlow.getStartOffset(thenBranch); |
| int endOffset = controlFlow.getEndOffset(thenBranch); |
| return startOffset != -1 && endOffset != -1 && !ControlFlowUtil.canCompleteNormally(controlFlow, startOffset, endOffset); |
| } |
| catch (AnalysisCanceledException e) { |
| return false; |
| } |
| } |
| |
| @Override |
| public void invoke(@NotNull Project project, Editor editor, @NotNull PsiElement element) throws IncorrectOperationException { |
| if (!FileModificationService.getInstance().preparePsiElementForWrite(element)) return; |
| PsiIfStatement ifStatement = (PsiIfStatement)element.getParent(); |
| LOG.assertTrue(ifStatement != null && ifStatement.getElseBranch() != null); |
| PsiStatement elseBranch = ifStatement.getElseBranch(); |
| if (elseBranch instanceof PsiBlockStatement) { |
| PsiElement[] statements = ((PsiBlockStatement)elseBranch).getCodeBlock().getStatements(); |
| if (statements.length > 0) { |
| ifStatement.getParent().addRangeAfter(statements[0], statements[statements.length-1], ifStatement); |
| } |
| } else { |
| ifStatement.getParent().addAfter(elseBranch, ifStatement); |
| } |
| ifStatement.getElseBranch().delete(); |
| } |
| } |