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//
// TypeSyntaxExtensions.cs
//
// Author:
// Mike Krüger <mkrueger@xamarin.com>
//
// Copyright (c) 2015 Xamarin Inc. (http://xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis;
using System.Threading;
using System.Linq;
namespace ICSharpCode.NRefactory6.CSharp
{
static class TypeSyntaxExtensions
{
public static bool IsPartial(this TypeSyntax typeSyntax)
{
return typeSyntax is IdentifierNameSyntax &&
((IdentifierNameSyntax)typeSyntax).Identifier.IsKind(SyntaxKind.PartialKeyword);
}
public static bool IsPotentialTypeName(this TypeSyntax typeSyntax, SemanticModel semanticModelOpt, CancellationToken cancellationToken)
{
if (typeSyntax == null)
{
return false;
}
if (typeSyntax is PredefinedTypeSyntax ||
typeSyntax is ArrayTypeSyntax ||
typeSyntax is GenericNameSyntax ||
typeSyntax is PointerTypeSyntax ||
typeSyntax is NullableTypeSyntax)
{
return true;
}
if (semanticModelOpt == null)
{
return false;
}
var nameSyntax = typeSyntax as NameSyntax;
if (nameSyntax == null)
{
return false;
}
var nameToken = nameSyntax.GetNameToken();
var symbols = semanticModelOpt.LookupName(nameToken, namespacesAndTypesOnly: true, cancellationToken: cancellationToken);
var firstSymbol = symbols.FirstOrDefault();
var typeSymbol = firstSymbol != null && firstSymbol.Kind == SymbolKind.Alias
? (firstSymbol as IAliasSymbol).Target
: firstSymbol as ITypeSymbol;
return typeSymbol != null
&& !typeSymbol.IsErrorType();
}
/// <summary>
/// Determines whether the specified TypeSyntax is actually 'var'.
/// </summary>
public static bool IsTypeInferred(this TypeSyntax typeSyntax, SemanticModel semanticModel)
{
if (!typeSyntax.IsVar)
{
return false;
}
if (semanticModel.GetAliasInfo(typeSyntax) != null)
{
return false;
}
var type = semanticModel.GetTypeInfo(typeSyntax).Type;
if (type == null)
{
return false;
}
if (type.Name == "var")
{
return false;
}
return true;
}
}
}
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