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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 System.Threading;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Simplification;
using ICSharpCode.NRefactory6.CSharp;
using Microsoft.CodeAnalysis.CSharp;
namespace MonoDevelop.CSharp.CodeRefactorings.InlineTemporary
{
internal partial class InlineTemporaryCodeRefactoringProvider
{
private class ReferenceRewriter : CSharpSyntaxRewriter
{
private readonly SemanticModel _semanticModel;
private readonly ILocalSymbol _localSymbol;
private readonly VariableDeclaratorSyntax _variableDeclarator;
private readonly ExpressionSyntax _expressionToInline;
private readonly CancellationToken _cancellationToken;
private ReferenceRewriter(
SemanticModel semanticModel,
VariableDeclaratorSyntax variableDeclarator,
ExpressionSyntax expressionToInline,
CancellationToken cancellationToken)
{
_semanticModel = semanticModel;
_localSymbol = (ILocalSymbol)semanticModel.GetDeclaredSymbol(variableDeclarator, cancellationToken);
_variableDeclarator = variableDeclarator;
_expressionToInline = expressionToInline;
_cancellationToken = cancellationToken;
}
private bool IsReference(SimpleNameSyntax name)
{
if (name.Identifier.ValueText != _variableDeclarator.Identifier.ValueText)
{
return false;
}
var symbol = _semanticModel.GetSymbolInfo(name).Symbol;
return symbol != null
&& symbol.Equals(_localSymbol);
}
public override SyntaxNode VisitIdentifierName(IdentifierNameSyntax node)
{
_cancellationToken.ThrowIfCancellationRequested();
if (IsReference(node))
{
if (HasConflict(node, _variableDeclarator))
{
return node.Update(node.Identifier.WithAdditionalAnnotations(CreateConflictAnnotation()));
}
return _expressionToInline
.Parenthesize()
.WithAdditionalAnnotations(Formatter.Annotation, Simplifier.Annotation);
}
return base.VisitIdentifierName(node);
}
public override SyntaxNode VisitAnonymousObjectMemberDeclarator(AnonymousObjectMemberDeclaratorSyntax node)
{
var nameEquals = node.NameEquals;
var expression = node.Expression;
var identifier = expression as IdentifierNameSyntax;
if (nameEquals != null || identifier == null || !IsReference(identifier) || HasConflict(identifier, _variableDeclarator))
{
return base.VisitAnonymousObjectMemberDeclarator(node);
}
// Special case inlining into anonymous types to ensure that we keep property names:
//
// E.g.
// int x = 42;
// var a = new { x; };
//
// Should become:
// var a = new { x = 42; };
nameEquals = SyntaxFactory.NameEquals(identifier);
expression = (ExpressionSyntax)this.Visit(expression);
return node.Update(nameEquals, expression).WithAdditionalAnnotations(Simplifier.Annotation, Formatter.Annotation);
}
public static SyntaxNode Visit(
SemanticModel semanticModel,
SyntaxNode scope,
VariableDeclaratorSyntax variableDeclarator,
ExpressionSyntax expressionToInline,
CancellationToken cancellationToken)
{
var rewriter = new ReferenceRewriter(semanticModel, variableDeclarator, expressionToInline, cancellationToken);
return rewriter.Visit(scope);
}
}
}
}
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