| /* |
| * 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 org.jetbrains.plugins.groovy.intentions.control; |
| |
| import com.intellij.openapi.editor.Editor; |
| import com.intellij.openapi.project.Project; |
| import com.intellij.psi.PsiElement; |
| import com.intellij.util.IncorrectOperationException; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.plugins.groovy.codeInspection.utils.EquivalenceChecker; |
| import org.jetbrains.plugins.groovy.intentions.base.Intention; |
| import org.jetbrains.plugins.groovy.intentions.base.PsiElementPredicate; |
| import org.jetbrains.plugins.groovy.lang.lexer.GroovyTokenTypes; |
| import org.jetbrains.plugins.groovy.lang.psi.GroovyPsiElementFactory; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.GrBlockStatement; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.GrIfStatement; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.branch.GrReturnStatement; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrAssignmentExpression; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrConditionalExpression; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression; |
| |
| /** |
| * @author Max Medvedev |
| */ |
| public class ReplaceIfWithTernaryIntention extends Intention { |
| @Override |
| protected void processIntention(@NotNull PsiElement element, Project project, Editor editor) throws IncorrectOperationException { |
| final GrIfStatement ifStatement = (GrIfStatement)element.getParent(); |
| |
| final PsiElement thenBranch = skipBlock(ifStatement.getThenBranch()); |
| final PsiElement elseBranch = skipBlock(ifStatement.getElseBranch()); |
| |
| if (thenBranch instanceof GrAssignmentExpression && elseBranch instanceof GrAssignmentExpression) { |
| final GrAssignmentExpression assignment = (GrAssignmentExpression)GroovyPsiElementFactory.getInstance(project).createStatementFromText("a = b ? c : d"); |
| |
| assignment.getLValue().replaceWithExpression(((GrAssignmentExpression)thenBranch).getLValue(), true); |
| |
| final GrConditionalExpression conditional = (GrConditionalExpression)assignment.getRValue(); |
| replaceConditional(conditional, ifStatement.getCondition(), ((GrAssignmentExpression)thenBranch).getRValue(), ((GrAssignmentExpression)elseBranch).getRValue()); |
| ifStatement.replaceWithStatement(assignment); |
| } |
| |
| |
| if (thenBranch instanceof GrReturnStatement && elseBranch instanceof GrReturnStatement) { |
| final GrReturnStatement returnSt = (GrReturnStatement)GroovyPsiElementFactory.getInstance(project).createStatementFromText("return a ? b : c"); |
| final GrConditionalExpression conditional = (GrConditionalExpression)returnSt.getReturnValue(); |
| replaceConditional(conditional, ifStatement.getCondition(), ((GrReturnStatement)thenBranch).getReturnValue(), ((GrReturnStatement)elseBranch).getReturnValue()); |
| |
| ifStatement.replaceWithStatement(returnSt); |
| } |
| } |
| |
| @SuppressWarnings("ConstantConditions") |
| private static void replaceConditional(GrConditionalExpression conditional, |
| GrExpression condition, |
| GrExpression then, |
| GrExpression elze) { |
| conditional.getCondition().replaceWithExpression(condition, true); |
| conditional.getThenBranch().replaceWithExpression(then, true); |
| conditional.getElseBranch().replaceWithExpression(elze, true); |
| } |
| |
| @NotNull |
| @Override |
| protected PsiElementPredicate getElementPredicate() { |
| return new PsiElementPredicate() { |
| @Override |
| public boolean satisfiedBy(PsiElement e) { |
| if (!e.getNode().getElementType().equals(GroovyTokenTypes.kIF)) return false; |
| if (!(e.getParent() instanceof GrIfStatement)) return false; |
| |
| final GrIfStatement ifStatement = (GrIfStatement)e.getParent(); |
| final PsiElement thenBranch = skipBlock(ifStatement.getThenBranch()); |
| final PsiElement elseBranch = skipBlock(ifStatement.getElseBranch()); |
| |
| if (thenBranch instanceof GrAssignmentExpression && |
| elseBranch instanceof GrAssignmentExpression && |
| ((GrAssignmentExpression)thenBranch).getRValue() != null && |
| ((GrAssignmentExpression)elseBranch).getRValue() != null) { |
| final GrExpression lvalue1 = ((GrAssignmentExpression)thenBranch).getLValue(); |
| final GrExpression lvalue2 = ((GrAssignmentExpression)elseBranch).getLValue(); |
| return EquivalenceChecker.expressionsAreEquivalent(lvalue1, lvalue2); |
| } |
| |
| if (thenBranch instanceof GrReturnStatement && |
| elseBranch instanceof GrReturnStatement && |
| ((GrReturnStatement)thenBranch).getReturnValue() != null && |
| ((GrReturnStatement)elseBranch).getReturnValue() != null) { |
| return true; |
| } |
| |
| return false; |
| } |
| }; |
| } |
| |
| private static PsiElement skipBlock(PsiElement e) { |
| if (e instanceof GrBlockStatement && ((GrBlockStatement)e).getBlock().getStatements().length == 1) { |
| return ((GrBlockStatement)e).getBlock().getStatements()[0]; |
| } |
| else { |
| return e; |
| } |
| } |
| } |