org.jetbrains.plugins.groovy.codeInspection.dataflow.WritesCounterDFAInstance Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of groovy-psi Show documentation
Show all versions of groovy-psi Show documentation
A packaging of the IntelliJ Community Edition groovy-psi library.
This is release number 1 of trunk branch 142.
The newest version!
/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* 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.dataflow;
import com.intellij.psi.PsiElement;
import gnu.trove.TObjectIntHashMap;
import org.jetbrains.annotations.Contract;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.GrVariable;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.clauses.GrForInClause;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrReferenceExpression;
import org.jetbrains.plugins.groovy.lang.psi.controlFlow.Instruction;
import org.jetbrains.plugins.groovy.lang.psi.controlFlow.ReadWriteVariableInstruction;
import org.jetbrains.plugins.groovy.lang.psi.dataFlow.DfaInstance;
import org.jetbrains.plugins.groovy.lang.psi.util.PsiUtil;
public class WritesCounterDFAInstance implements DfaInstance> {
@Contract("null -> null")
@Nullable
private static GrVariable getVariable(@Nullable PsiElement instructionElement) {
final GrVariable variable;
if (instructionElement instanceof GrReferenceExpression) {
final PsiElement resolved = ((GrReferenceExpression)instructionElement).resolve();
variable = resolved instanceof GrVariable ? (GrVariable)resolved : null;
}
else if (instructionElement instanceof GrVariable) {
variable = (GrVariable)instructionElement;
}
else {
variable = null;
}
return variable != null && PsiUtil.isLocalOrParameter(variable) ? variable : null;
}
@Override
public void fun(TObjectIntHashMap map, Instruction instruction) {
if (!(instruction instanceof ReadWriteVariableInstruction)) return;
final ReadWriteVariableInstruction rwInstruction = (ReadWriteVariableInstruction)instruction;
if (!rwInstruction.isWrite()) return;
final GrVariable variable = getVariable(instruction.getElement());
if (variable == null) return;
int currentVal = map.get(variable);
if (currentVal == 2) return;
if (currentVal == 0 || currentVal == 1 && !(variable.getParent() instanceof GrForInClause)) currentVal++;
map.put(variable, currentVal);
}
@NotNull
@Override
public TObjectIntHashMap initial() {
return new TObjectIntHashMap();
}
@Override
public boolean isForward() {
return true;
}
}