/*
* Copyright 2013-2016 Sergey Ignatov, Alexander Zolotov, Florin Patan
*
* 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.goide.inspections;
import com.goide.psi.GoAssignmentStatement;
import com.goide.psi.GoIfStatement;
import com.goide.psi.GoShortVarDeclaration;
import com.goide.psi.GoVisitor;
import com.goide.psi.impl.GoElementFactory;
import com.goide.psi.impl.GoPsiImplUtil;
import com.intellij.codeInspection.LocalInspectionToolSession;
import com.intellij.codeInspection.LocalQuickFixBase;
import com.intellij.codeInspection.ProblemDescriptor;
import com.intellij.codeInspection.ProblemsHolder;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import org.jetbrains.annotations.NotNull;
import static com.intellij.codeInspection.ProblemHighlightType.GENERIC_ERROR_OR_WARNING;
public class GoUsedAsValueInCondition extends GoInspectionBase {
public static final String QUICK_FIX_NAME = "Convert to '==''";
@NotNull
@Override
protected GoVisitor buildGoVisitor(@NotNull ProblemsHolder holder, @NotNull LocalInspectionToolSession session) {
return new GoVisitor() {
@Override
public void visitAssignmentStatement(@NotNull GoAssignmentStatement o) {
if (o.getParent() != null && o.getParent() instanceof GoIfStatement && ((GoIfStatement)o.getParent()).getExpression() == null) {
String left = GoPsiImplUtil.joinPsiElementText(o.getLeftHandExprList().getExpressionList());
String right = GoPsiImplUtil.joinPsiElementText(o.getExpressionList());
holder.registerProblem(o, left + " = " + right + " used as value", GENERIC_ERROR_OR_WARNING,
new GoAssignmentToComparisonQuickFix());
}
}
@Override
public void visitShortVarDeclaration(@NotNull GoShortVarDeclaration o) {
PsiElement parent = o.getParent();
if (parent != null) {
PsiElement gradParent = parent.getParent();
if (gradParent instanceof GoIfStatement && ((GoIfStatement)gradParent).getExpression() == null) {
String left = GoPsiImplUtil.joinPsiElementText(o.getVarDefinitionList());
String right = GoPsiImplUtil.joinPsiElementText(o.getRightExpressionsList());
holder.registerProblem(o, left + " := " + right + " used as value", GENERIC_ERROR_OR_WARNING,
new GoAssignmentToComparisonQuickFix());
}
}
}
};
}
private static class GoAssignmentToComparisonQuickFix extends LocalQuickFixBase {
private GoAssignmentToComparisonQuickFix() {
super(QUICK_FIX_NAME);
}
@Override
public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
PsiElement element = descriptor.getPsiElement();
if (element instanceof GoAssignmentStatement) {
String left = GoPsiImplUtil.joinPsiElementText(((GoAssignmentStatement)element).getLeftHandExprList().getExpressionList());
String right = GoPsiImplUtil.joinPsiElementText(((GoAssignmentStatement)element).getExpressionList());
element.replace(GoElementFactory.createExpression(project, left + " == " + right));
}
else if (element instanceof GoShortVarDeclaration) {
String left = GoPsiImplUtil.joinPsiElementText(((GoShortVarDeclaration)element).getVarDefinitionList());
String right = GoPsiImplUtil.joinPsiElementText(((GoShortVarDeclaration)element).getRightExpressionsList());
element.replace(GoElementFactory.createComparison(project, left + " == " + right));
}
}
}
}