| /* |
| * Copyright 2000-2013 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 com.jetbrains.python.inspections; |
| |
| import com.intellij.codeInspection.LocalInspectionToolSession; |
| import com.intellij.codeInspection.ProblemHighlightType; |
| import com.intellij.codeInspection.ProblemsHolder; |
| import com.intellij.psi.PsiElement; |
| import com.intellij.psi.PsiElementVisitor; |
| import com.intellij.psi.PsiNameIdentifierOwner; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.jetbrains.python.codeInsight.controlflow.ControlFlowCache; |
| import com.jetbrains.python.codeInsight.controlflow.ScopeOwner; |
| import com.jetbrains.python.codeInsight.dataflow.scope.Scope; |
| import com.jetbrains.python.codeInsight.dataflow.scope.ScopeUtil; |
| import com.jetbrains.python.inspections.quickfix.PyRenameElementQuickFix; |
| import com.jetbrains.python.psi.*; |
| import com.jetbrains.python.psi.resolve.PyResolveUtil; |
| import com.jetbrains.python.psi.resolve.ResolveProcessor; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * Warns about shadowing names defined in outer scopes. |
| * |
| * @author vlan |
| */ |
| public class PyShadowingNamesInspection extends PyInspection { |
| @NotNull |
| @Override |
| public String getDisplayName() { |
| return "Shadowing names from outer scopes"; |
| } |
| |
| @NotNull |
| @Override |
| public PsiElementVisitor buildVisitor(@NotNull ProblemsHolder holder, |
| boolean isOnTheFly, |
| @NotNull LocalInspectionToolSession session) { |
| return new Visitor(holder, session); |
| } |
| |
| private static class Visitor extends PyInspectionVisitor { |
| public Visitor(@Nullable ProblemsHolder holder, @NotNull LocalInspectionToolSession session) { |
| super(holder, session); |
| } |
| |
| @Override |
| public void visitPyClass(@NotNull PyClass node) { |
| processElement(node); |
| } |
| |
| @Override |
| public void visitPyFunction(@NotNull PyFunction node) { |
| processElement(node); |
| } |
| |
| @Override |
| public void visitPyNamedParameter(@NotNull PyNamedParameter node) { |
| if (node.isSelf()) { |
| return; |
| } |
| processElement(node); |
| } |
| |
| @Override |
| public void visitPyTargetExpression(@NotNull PyTargetExpression node) { |
| if (!node.isQualified()) { |
| processElement(node); |
| } |
| } |
| |
| private void processElement(@NotNull PsiNameIdentifierOwner element) { |
| final ScopeOwner owner = ScopeUtil.getScopeOwner(element); |
| if (owner instanceof PyClass) { |
| return; |
| } |
| final String name = element.getName(); |
| if (name != null) { |
| final PsiElement identifier = element.getNameIdentifier(); |
| final PsiElement problemElement = identifier != null ? identifier : element; |
| if ("_".equals(name)) { |
| return; |
| } |
| if (owner != null) { |
| final ScopeOwner nextOwner = ScopeUtil.getScopeOwner(owner); |
| if (nextOwner != null) { |
| final ResolveProcessor processor = new ResolveProcessor(name); |
| PyResolveUtil.scopeCrawlUp(processor, nextOwner, null, name, null, null); |
| final PsiElement resolved = processor.getResult(); |
| if (resolved != null) { |
| final PyComprehensionElement comprehension = PsiTreeUtil.getParentOfType(resolved, PyComprehensionElement.class); |
| if (comprehension != null && PyUtil.isOwnScopeComprehension(comprehension)) { |
| return; |
| } |
| final Scope scope = ControlFlowCache.getScope(owner); |
| if (scope.isGlobal(name) || scope.isNonlocal(name)) { |
| return; |
| } |
| registerProblem(problemElement, String.format("Shadows name '%s' from outer scope", name), |
| ProblemHighlightType.WEAK_WARNING, null, new PyRenameElementQuickFix()); |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| |