CS0128.java

/*
 * Copyright 2013-2017 consulo.io
 *
 * 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 consulo.csharp.ide.highlight.check.impl;

import gnu.trove.THashSet;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.jetbrains.annotations.NotNull;
import consulo.annotations.RequiredReadAction;
import consulo.csharp.ide.highlight.CSharpHighlightContext;
import consulo.csharp.ide.highlight.check.CompilerCheck;
import consulo.csharp.lang.psi.CSharpLocalVariable;
import consulo.csharp.lang.psi.CSharpRecursiveElementVisitor;
import consulo.csharp.lang.psi.impl.source.*;
import consulo.csharp.module.extension.CSharpLanguageVersion;
import consulo.dotnet.psi.DotNetExpression;
import consulo.dotnet.psi.DotNetModifierListOwner;
import consulo.dotnet.psi.DotNetParameter;
import com.intellij.psi.PsiElement;

/**
 * @author VISTALL
 * @since 20.05.14
 */
public class CS0128 extends CompilerCheck<CSharpBlockStatementImpl>
{
	@RequiredReadAction
	@NotNull
	@Override
	public List<CompilerCheckBuilder> check(@NotNull CSharpLanguageVersion languageVersion, @NotNull CSharpHighlightContext highlightContext, @NotNull CSharpBlockStatementImpl element)
	{
		PsiElement parent = element.getParent();
		if(!(parent instanceof DotNetModifierListOwner))
		{
			return Collections.emptyList();
		}
		final List<CompilerCheckBuilder> results = new ArrayList<CompilerCheckBuilder>();
		final Set<String> names = new THashSet<String>();
		parent.accept(new CSharpRecursiveElementVisitor()
		{
			@Override
			@RequiredReadAction
			public void visitLocalVariable(CSharpLocalVariable variable)
			{
				String name = variable.getName();
				if(names.contains(name))
				{
					results.add(newBuilder(variable.getNameIdentifier(), name));
				}
				else
				{
					names.add(name);
				}

				DotNetExpression initializer = variable.getInitializer();
				if(initializer != null)
				{
					initializer.accept(this);
				}
			}

			@Override
			public void visitCatchStatement(CSharpCatchStatementImpl statement)
			{
				visitAndRollback(statement);
			}

			@Override
			public void visitIfStatement(CSharpIfStatementImpl statement)
			{
				visitAndRollback(statement);
			}

			@Override
			public void visitTryStatement(CSharpTryStatementImpl statement)
			{
				visitAndRollback(statement);
			}

			@Override
			public void visitBlockStatement(CSharpBlockStatementImpl statement)
			{
				visitAndRollback(statement);
			}

			@Override
			public void visitForeachStatement(CSharpForeachStatementImpl statement)
			{
				visitAndRollback(statement);
			}

			@Override
			public void visitFixedStatement(CSharpFixedStatementImpl statement)
			{
				visitAndRollback(statement);
			}

			@Override
			public void visitForStatement(CSharpForStatementImpl statement)
			{
				visitAndRollback(statement);
			}

			@Override
			public void visitParameter(DotNetParameter parameter)
			{
				String name = parameter.getName();
				names.add(name);
			}

			@Override
			public void visitLambdaExpression(CSharpLambdaExpressionImpl expression)
			{
				visitAndRollback(expression);
			}

			@Override
			public void visitAnonymMethodExpression(CSharpDelegateExpressionImpl method)
			{
				visitAndRollback(method);
			}

			@Override
			public void visitLambdaParameter(CSharpLambdaParameterImpl parameter)
			{
				String name = parameter.getName();
				if(names.contains(name))
				{

					results.add(newBuilderImpl(CS0136.class, parameter.getNameIdentifier(), name, name));
				}
				else
				{
					names.add(name);
				}
			}

			private void visitAndRollback(PsiElement e)
			{
				Set<String> oldSet = new HashSet<String>(names);

				visitElement(e);

				names.clear();
				names.addAll(oldSet);
			}
		});
		return results;
	}
}