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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.control;
import com.intellij.codeInspection.ProblemDescriptor;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrConditionalExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression;
import org.jetbrains.plugins.groovy.codeInspection.BaseInspectionVisitor;
import org.jetbrains.plugins.groovy.codeInspection.BaseInspection;
import org.jetbrains.plugins.groovy.codeInspection.GroovyFix;
public class GroovyConstantConditionalInspection extends BaseInspection {
@Override
@NotNull
public String getGroupDisplayName() {
return CONTROL_FLOW;
}
@Override
@NotNull
public String getDisplayName() {
return "Constant conditional expression";
}
@Override
public boolean isEnabledByDefault() {
return true;
}
@Override
public BaseInspectionVisitor buildVisitor() {
return new ConstantConditionalExpressionVisitor();
}
@Override
@NotNull
public String buildErrorString(Object... args) {
return "'#ref' can be simplified #loc";
}
static String calculateReplacementExpression(
GrConditionalExpression exp) {
final GrExpression thenExpression = exp.getThenBranch();
final GrExpression elseExpression = exp.getElseBranch();
final GrExpression condition = exp.getCondition();
assert thenExpression != null;
assert elseExpression != null;
if (isTrue(condition)) {
return thenExpression.getText();
} else {
return elseExpression.getText();
}
}
@Override
public GroovyFix buildFix(PsiElement location) {
return new ConstantConditionalFix();
}
private static class ConstantConditionalFix extends GroovyFix {
@Override
@NotNull
public String getName() {
return "Simplify";
}
@Override
public void doFix(Project project, ProblemDescriptor descriptor)
throws IncorrectOperationException {
final GrConditionalExpression expression =
(GrConditionalExpression) descriptor.getPsiElement();
final String newExpression =
calculateReplacementExpression(expression);
replaceExpression(expression, newExpression);
}
}
private static class ConstantConditionalExpressionVisitor
extends BaseInspectionVisitor {
@Override
public void visitConditionalExpression(
GrConditionalExpression expression) {
super.visitConditionalExpression(expression);
final GrExpression condition = expression.getCondition();
final GrExpression thenExpression = expression.getThenBranch();
if (thenExpression == null) {
return;
}
final GrExpression elseExpression = expression.getElseBranch();
if (elseExpression == null) {
return;
}
if (isFalse(condition) || isTrue(condition)) {
registerError(expression, expression);
}
}
}
private static boolean isFalse(GrExpression expression) {
@NonNls final String text = expression.getText();
return "false".equals(text);
}
private static boolean isTrue(GrExpression expression) {
@NonNls final String text = expression.getText();
return "true".equals(text);
}
}
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