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A packaging of the IntelliJ Community Edition java-impl library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2003-2012 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 com.siyeh.ipp.psiutils.ErrorUtil;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;

public class ExpandBooleanIntention extends Intention {

  @Override
  @NotNull
  public PsiElementPredicate getElementPredicate() {
    return new ExpandBooleanPredicate();
  }

  @Override
  public void processIntention(@NotNull PsiElement element) throws IncorrectOperationException {
    final PsiStatement containingStatement = PsiTreeUtil.getParentOfType(element, PsiStatement.class);
    if (containingStatement == null) {
      return;
    }
    if (ExpandBooleanPredicate.isBooleanAssignment(containingStatement)) {
      final PsiExpressionStatement assignmentStatement = (PsiExpressionStatement)containingStatement;
      final PsiAssignmentExpression assignmentExpression = (PsiAssignmentExpression)assignmentStatement.getExpression();
      final PsiExpression rhs = assignmentExpression.getRExpression();
      if (rhs == null) {
        return;
      }
      final PsiExpression lhs = assignmentExpression.getLExpression();
      if (ErrorUtil.containsDeepError(lhs) || ErrorUtil.containsDeepError(rhs)) {
        return;
      }
      final String rhsText = rhs.getText();
      final String lhsText = lhs.getText();
      final PsiJavaToken sign = assignmentExpression.getOperationSign();
      final String signText = sign.getText();
      final String conditionText;
      if (signText.length() == 2) {
        conditionText = lhsText + signText.charAt(0) + rhsText;
      }
      else {
        conditionText = rhsText;
      }
      @NonNls final String statement = "if(" + conditionText + ") " + lhsText + " = true; else " + lhsText + " = false;";
      PsiReplacementUtil.replaceStatement(containingStatement, statement);
    }
    else if (ExpandBooleanPredicate.isBooleanReturn(containingStatement)) {
      final PsiReturnStatement returnStatement = (PsiReturnStatement)containingStatement;
      final PsiExpression returnValue = returnStatement.getReturnValue();
      if (returnValue == null) {
        return;
      }
      if (ErrorUtil.containsDeepError(returnValue)) {
        return;
      }
      final String valueText = returnValue.getText();
      @NonNls final String statement = "if(" + valueText + ") return true; else return false;";
      PsiReplacementUtil.replaceStatement(containingStatement, statement);
    }
    else if (ExpandBooleanPredicate.isBooleanDeclaration(containingStatement)) {
      final PsiDeclarationStatement declarationStatement = (PsiDeclarationStatement)containingStatement;
      final PsiElement declaredElement = declarationStatement.getDeclaredElements()[0];
      if (!(declaredElement instanceof PsiLocalVariable)) {
        return;
      }
      final PsiLocalVariable variable = (PsiLocalVariable)declaredElement;
      final PsiExpression initializer = variable.getInitializer();
      if (initializer == null) {
        return;
      }
      final String name = variable.getName();
      @NonNls final String newStatementText = "if(" + initializer.getText() + ") " + name +"=true; else " + name + "=false;";
      final PsiElementFactory factory = JavaPsiFacade.getElementFactory(containingStatement.getProject());
      final PsiStatement newStatement = factory.createStatementFromText(newStatementText, containingStatement);
      declarationStatement.getParent().addAfter(newStatement, declarationStatement);
      initializer.delete();
    }
  }
}