| /* |
| * Copyright 2007-2008 Dave Griffith |
| * |
| * 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.codeInspection.bugs; |
| |
| import com.intellij.psi.tree.IElementType; |
| import org.jetbrains.annotations.Nls; |
| import org.jetbrains.annotations.NonNls; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| import org.jetbrains.plugins.groovy.codeInspection.BaseInspection; |
| import org.jetbrains.plugins.groovy.codeInspection.BaseInspectionVisitor; |
| import org.jetbrains.plugins.groovy.lang.lexer.GroovyTokenTypes; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrAssignmentExpression; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrBinaryExpression; |
| import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression; |
| |
| public class GroovyDivideByZeroInspection extends BaseInspection { |
| |
| @Override |
| @Nls |
| @NotNull |
| public String getGroupDisplayName() { |
| return PROBABLE_BUGS; |
| } |
| |
| @Override |
| @Nls |
| @NotNull |
| public String getDisplayName() { |
| return "Divide by zero"; |
| } |
| |
| @Override |
| @Nullable |
| protected String buildErrorString(Object... args) { |
| return "Division by zero #loc"; |
| |
| } |
| |
| @Override |
| public boolean isEnabledByDefault() { |
| return true; |
| } |
| |
| @NotNull |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new Visitor(); |
| } |
| |
| private static class Visitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitBinaryExpression( |
| @NotNull GrBinaryExpression expression) { |
| super.visitBinaryExpression(expression); |
| final GrExpression rhs = expression.getRightOperand(); |
| if (rhs == null) { |
| return; |
| } |
| final IElementType tokenType = expression.getOperationTokenType(); |
| if (!GroovyTokenTypes.mDIV.equals(tokenType) && |
| !GroovyTokenTypes.mMOD.equals(tokenType)) { |
| return; |
| } |
| if (!isZero(rhs)) { |
| return; |
| } |
| registerError(expression); |
| } |
| |
| @Override |
| public void visitAssignmentExpression( |
| GrAssignmentExpression expression) { |
| super.visitAssignmentExpression(expression); |
| final GrExpression rhs = expression.getRValue(); |
| if (rhs == null) { |
| return; |
| } |
| final IElementType tokenType = expression.getOperationTokenType(); |
| if (!tokenType.equals(GroovyTokenTypes.mDIV_ASSIGN) |
| && !tokenType.equals(GroovyTokenTypes.mMOD_ASSIGN)) { |
| return; |
| } |
| if (!isZero(rhs)) { |
| return; |
| } |
| registerError(expression); |
| } |
| |
| |
| } |
| |
| private static boolean isZero(GrExpression expression) { |
| @NonNls |
| final String text = expression.getText(); |
| return "0".equals(text) || |
| "0x0".equals(text) || |
| "0X0".equals(text) || |
| "0.0".equals(text) || |
| "0L".equals(text) || |
| "0l".equals(text); |
| } |
| } |