| /* |
| * Copyright 2003-2010 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.intellij.util.IncorrectOperationException; |
| import com.siyeh.ig.PsiReplacementUtil; |
| import com.siyeh.ipp.base.Intention; |
| import com.siyeh.ipp.base.PsiElementPredicate; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.NonNls; |
| |
| public class MergeParallelIfsIntention extends Intention { |
| |
| @Override |
| @NotNull |
| public PsiElementPredicate getElementPredicate() { |
| return new MergeParallelIfsPredicate(); |
| } |
| |
| @Override |
| public void processIntention(PsiElement element) |
| throws IncorrectOperationException { |
| final PsiJavaToken token = (PsiJavaToken)element; |
| final PsiIfStatement firstStatement = (PsiIfStatement)token.getParent(); |
| final PsiIfStatement secondStatement = |
| (PsiIfStatement)PsiTreeUtil.skipSiblingsForward(firstStatement, |
| PsiWhiteSpace.class); |
| final String statement = |
| mergeIfStatements(firstStatement, secondStatement); |
| assert firstStatement != null; |
| PsiReplacementUtil.replaceStatement(firstStatement, statement); |
| assert secondStatement != null; |
| secondStatement.delete(); |
| } |
| |
| private static String mergeIfStatements(PsiIfStatement firstStatement, |
| PsiIfStatement secondStatement) { |
| final PsiExpression condition = firstStatement.getCondition(); |
| final String conditionText; |
| if (condition == null) { |
| conditionText = ""; |
| } |
| else { |
| conditionText = condition.getText(); |
| } |
| final PsiStatement firstThenBranch = firstStatement.getThenBranch(); |
| final PsiStatement secondThenBranch = secondStatement.getThenBranch(); |
| @NonNls String statement = "if(" + conditionText + ')' + |
| printStatementsInSequence(firstThenBranch, |
| secondThenBranch); |
| final PsiStatement firstElseBranch = firstStatement.getElseBranch(); |
| final PsiStatement secondElseBranch = secondStatement.getElseBranch(); |
| if (firstElseBranch != null || secondElseBranch != null) { |
| if (firstElseBranch instanceof PsiIfStatement |
| && secondElseBranch instanceof PsiIfStatement |
| && MergeParallelIfsPredicate.ifStatementsCanBeMerged( |
| (PsiIfStatement)firstElseBranch, |
| (PsiIfStatement)secondElseBranch)) { |
| statement += "else " + |
| mergeIfStatements((PsiIfStatement)firstElseBranch, |
| (PsiIfStatement)secondElseBranch); |
| } |
| else { |
| statement += "else" + |
| printStatementsInSequence(firstElseBranch, |
| secondElseBranch); |
| } |
| } |
| return statement; |
| } |
| |
| private static String printStatementsInSequence(PsiStatement statement1, |
| PsiStatement statement2) { |
| if (statement1 == null) { |
| return ' ' + statement2.getText(); |
| } |
| if (statement2 == null) { |
| return ' ' + statement1.getText(); |
| } |
| final StringBuilder out = new StringBuilder(); |
| out.append('{'); |
| printStatementStripped(statement1, out); |
| printStatementStripped(statement2, out); |
| out.append('}'); |
| return out.toString(); |
| } |
| |
| private static void printStatementStripped(PsiStatement statement, |
| StringBuilder out) { |
| if (statement instanceof PsiBlockStatement) { |
| final PsiCodeBlock block = |
| ((PsiBlockStatement)statement).getCodeBlock(); |
| final PsiElement[] children = block.getChildren(); |
| for (int i = 1; i < children.length - 1; i++) { |
| out.append(children[i].getText()); |
| } |
| } |
| else { |
| out.append(statement.getText()); |
| } |
| } |
| } |