/*
* Copyright 2012-2014 Sergey Ignatov
*
* 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.intellij.erlang.inspection;
import com.intellij.codeInspection.ProblemHighlightType;
import com.intellij.codeInspection.ProblemsHolder;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiReference;
import com.intellij.psi.search.LocalSearchScope;
import com.intellij.psi.search.searches.ReferencesSearch;
import com.intellij.util.Query;
import org.intellij.erlang.psi.*;
import org.intellij.erlang.psi.impl.ErlangPsiImplUtil;
import org.intellij.erlang.quickfixes.ErlangRenameVariableFix;
import org.jetbrains.annotations.NotNull;
import static org.intellij.erlang.psi.impl.ErlangPsiImplUtil.*;
public class ErlangUnusedVariableInspection extends ErlangInspectionBase {
@Override
protected void checkFile(@NotNull ErlangFile file, @NotNull final ProblemsHolder problemsHolder) {
for (ErlangFunction function : file.getFunctions()) {
for (final ErlangFunctionClause functionClause : function.getFunctionClauseList()) {
functionClause.accept(new ErlangRecursiveVisitor() {
@Override
public void visitQVar(@NotNull ErlangQVar o) {
if (!isForceSkipped(o) && !isMacros(o) && (inArgumentDefinition(o) && !inArgumentList(o) || inLeftPartOfAssignment(o))) {
PsiReference reference = o.getReference();
PsiElement resolve = reference != null ? reference.resolve() : null;
if (resolve == null) {
Query<PsiReference> search = ReferencesSearch.search(o, new LocalSearchScope(functionClause));
for (PsiReference ref : search) {
PsiElement element = ref.getElement();
if (ErlangPsiImplUtil.fromTheSameCaseExpression(o, element)) {
PsiReference reference1 = element.getReference();
if (reference1 == null || reference1.resolve() == null) continue;
}
return;
}
problemsHolder.registerProblem(o, "Unused variable " + "'" + o.getText() + "'", ProblemHighlightType.LIKE_UNUSED_SYMBOL, new ErlangRenameVariableFix());
}
}
}
});
}
}
}
}