| /* |
| * Copyright 2003-2011 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.ig.style; |
| |
| import com.intellij.codeInspection.ProblemDescriptor; |
| import com.intellij.openapi.project.Project; |
| import com.intellij.psi.PsiBinaryExpression; |
| import com.intellij.psi.PsiExpression; |
| import com.intellij.psi.util.PsiUtil; |
| import com.intellij.util.IncorrectOperationException; |
| import com.siyeh.InspectionGadgetsBundle; |
| import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import com.siyeh.ig.InspectionGadgetsFix; |
| import com.siyeh.ig.PsiReplacementUtil; |
| import com.siyeh.ig.psiutils.ComparisonUtils; |
| import com.siyeh.ig.psiutils.ExpressionUtils; |
| import org.jetbrains.annotations.NotNull; |
| |
| public class ConstantOnRHSOfComparisonInspection extends BaseInspection { |
| |
| @Override |
| @NotNull |
| public String getID() { |
| return "ConstantOnRightSideOfComparison"; |
| } |
| |
| @Override |
| @NotNull |
| public String getDisplayName() { |
| return InspectionGadgetsBundle.message("constant.on.rhs.of.comparison.display.name"); |
| } |
| |
| @Override |
| @NotNull |
| public String buildErrorString(Object... infos) { |
| return InspectionGadgetsBundle.message("constant.on.rhs.of.comparison.problem.descriptor"); |
| } |
| |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new ConstantOnRHSOfComparisonVisitor(); |
| } |
| |
| @Override |
| public InspectionGadgetsFix buildFix(Object... infos) { |
| return new SwapComparisonFix(); |
| } |
| |
| private static class SwapComparisonFix extends InspectionGadgetsFix { |
| @Override |
| @NotNull |
| public String getFamilyName() { |
| return getName(); |
| } |
| |
| @Override |
| @NotNull |
| public String getName() { |
| return InspectionGadgetsBundle.message("flip.comparison.quickfix"); |
| } |
| |
| @Override |
| public void doFix(Project project, ProblemDescriptor descriptor) throws IncorrectOperationException { |
| final PsiBinaryExpression expression = (PsiBinaryExpression)descriptor.getPsiElement(); |
| final PsiExpression rhs = expression.getROperand(); |
| if (rhs == null) { |
| return; |
| } |
| final String flippedComparison = ComparisonUtils.getFlippedComparison(expression.getOperationTokenType()); |
| if (flippedComparison == null) { |
| return; |
| } |
| final PsiExpression lhs = expression.getLOperand(); |
| final String rhsText = rhs.getText(); |
| final String lhsText = lhs.getText(); |
| PsiReplacementUtil.replaceExpression(expression, rhsText + ' ' + flippedComparison + ' ' + lhsText); |
| } |
| } |
| |
| private static class ConstantOnRHSOfComparisonVisitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitBinaryExpression(@NotNull PsiBinaryExpression expression) { |
| super.visitBinaryExpression(expression); |
| if (!ComparisonUtils.isComparison(expression)) { |
| return; |
| } |
| final PsiExpression lhs = expression.getLOperand(); |
| final PsiExpression rhs = expression.getROperand(); |
| if (!isConstantExpression(rhs) || isConstantExpression(lhs)) { |
| return; |
| } |
| registerError(expression); |
| } |
| |
| private static boolean isConstantExpression(PsiExpression expression) { |
| return ExpressionUtils.isNullLiteral(expression) || PsiUtil.isConstantExpression(expression); |
| } |
| } |
| } |