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/*
* 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;
}
@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);
}
}
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