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// Copyright (c) Microsoft. All Rights Reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Simplification;
using Microsoft.CodeAnalysis.CSharp;
using ICSharpCode.NRefactory6.CSharp;
namespace MonoDevelop.CSharp.CodeRefactorings.InlineTemporary
{
internal partial class InlineTemporaryCodeRefactoringProvider
{
/// <summary>
/// This class handles rewriting initializer expressions that refer to the variable
/// being initialized into a simpler form. For example, in "int x = x = 1", we want to
/// get just "1" back as the initializer.
/// </summary>
private class InitializerRewriter : CSharpSyntaxRewriter
{
private readonly SemanticModel _semanticModel;
private readonly ILocalSymbol _localSymbol;
private readonly ExpressionSyntax _initializer;
private InitializerRewriter(ExpressionSyntax initializer, ILocalSymbol localSymbol, SemanticModel semanticModel)
{
_semanticModel = semanticModel;
_localSymbol = localSymbol;
_initializer = initializer;
}
private bool IsReference(SimpleNameSyntax name)
{
if (name.Identifier.ValueText != _localSymbol.Name)
{
return false;
}
var symbol = _semanticModel.GetSymbolInfo(name).Symbol;
return symbol != null
&& symbol.Equals(_localSymbol);
}
public override SyntaxNode VisitAssignmentExpression(AssignmentExpressionSyntax node)
{
// Note - leave this as SyntaxNode for now, we might have already re-written it
var newNode = base.VisitAssignmentExpression(node);
if (newNode.Kind() == SyntaxKind.SimpleAssignmentExpression)
{
// It's okay to just look at the text, since we're explicitly looking for an
// identifier standing alone, and we know we're in a local's initializer.
// The text can only bind to the initializer.
var assignment = (AssignmentExpressionSyntax)newNode;
var name = assignment.Left.Kind() == SyntaxKind.IdentifierName
? (IdentifierNameSyntax)assignment.Left
: null;
if (name != null && IsReference(name))
{
return assignment.Right;
}
}
return newNode;
}
public override SyntaxNode VisitIdentifierName(IdentifierNameSyntax node)
{
if (IsReference(node))
{
var assignmentExpression = node.Parent as AssignmentExpressionSyntax;
if (assignmentExpression != null)
{
if (assignmentExpression.IsCompoundAssignExpression() &&
assignmentExpression.Left == node)
{
return node.Update(node.Identifier.WithAdditionalAnnotations(CreateConflictAnnotation()));
}
}
}
return base.VisitIdentifierName(node);
}
public override SyntaxNode VisitParenthesizedExpression(ParenthesizedExpressionSyntax node)
{
var newNode = base.VisitParenthesizedExpression(node);
if (node != newNode && newNode.Kind() == SyntaxKind.ParenthesizedExpression)
{
return newNode.WithAdditionalAnnotations(Simplifier.Annotation);
}
return newNode;
}
public static ExpressionSyntax Visit(ExpressionSyntax initializer, ILocalSymbol local, SemanticModel semanticModel)
{
var simplifier = new InitializerRewriter(initializer, local, semanticModel);
return (ExpressionSyntax)simplifier.Visit(initializer);
}
}
}
}
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