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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.confusing;
import com.intellij.codeInspection.ProblemDescriptor;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import com.intellij.psi.tree.IElementType;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.Nls;
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.codeInspection.GroovyFix;
import org.jetbrains.plugins.groovy.lang.lexer.GroovyTokenTypes;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrBinaryExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrParenthesizedExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrUnaryExpression;
import org.jetbrains.plugins.groovy.lang.psi.util.PsiUtil;
public class GroovyDoubleNegationInspection extends BaseInspection {
@Override
@Nls
@NotNull
public String getGroupDisplayName() {
return CONFUSING_CODE_CONSTRUCTS;
}
@Override
@NotNull
public String getDisplayName() {
return "Double negation";
}
@Override
@NotNull
protected String buildErrorString(Object... infos) {
return "Double negation #ref #loc";
}
@Override
@Nullable
protected GroovyFix buildFix(@NotNull PsiElement location) {
return new DoubleNegationFix();
}
@Override
public boolean isEnabledByDefault() {
return true;
}
private static class DoubleNegationFix extends GroovyFix {
@Override
@NotNull
public String getName() {
return "Remove double negation";
}
@Override
protected void doFix(Project project, ProblemDescriptor descriptor)
throws IncorrectOperationException {
final GrUnaryExpression expression =
(GrUnaryExpression) descriptor.getPsiElement();
GrExpression operand = (GrExpression)PsiUtil.skipParentheses(expression.getOperand(), false);
if (operand instanceof GrUnaryExpression) {
final GrUnaryExpression prefixExpression =
(GrUnaryExpression) operand;
final GrExpression innerOperand = prefixExpression.getOperand();
if (innerOperand == null) {
return;
}
replaceExpression(expression, innerOperand.getText());
} else if (operand instanceof GrBinaryExpression) {
final GrBinaryExpression binaryExpression =
(GrBinaryExpression) operand;
final GrExpression lhs = binaryExpression.getLeftOperand();
final String lhsText = lhs.getText();
final StringBuilder builder =
new StringBuilder(lhsText);
builder.append("==");
final GrExpression rhs = binaryExpression.getRightOperand();
if (rhs != null) {
final String rhsText = rhs.getText();
builder.append(rhsText);
}
replaceExpression(expression, builder.toString());
}
}
}
@NotNull
@Override
public BaseInspectionVisitor buildVisitor() {
return new DoubleNegationVisitor();
}
private static class DoubleNegationVisitor extends BaseInspectionVisitor {
@Override
public void visitUnaryExpression(GrUnaryExpression expression) {
super.visitUnaryExpression(expression);
final IElementType tokenType = expression.getOperationTokenType();
if (!GroovyTokenTypes.mLNOT.equals(tokenType)) {
return;
}
checkParent(expression);
}
@Override
public void visitBinaryExpression(GrBinaryExpression expression) {
super.visitBinaryExpression(expression);
final IElementType tokenType = expression.getOperationTokenType();
if (!GroovyTokenTypes.mNOT_EQUAL.equals(tokenType)) {
return;
}
checkParent(expression);
}
private void checkParent(GrExpression expression) {
PsiElement parent = expression.getParent();
while (parent instanceof GrParenthesizedExpression) {
parent = parent.getParent();
}
if (!(parent instanceof GrUnaryExpression)) {
return;
}
final GrUnaryExpression prefixExpression =
(GrUnaryExpression) parent;
final IElementType parentTokenType =
prefixExpression.getOperationTokenType();
if (!GroovyTokenTypes.mLNOT.equals(parentTokenType)) {
return;
}
registerError(prefixExpression);
}
}
}
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