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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.Collections.Generic;
using System.Linq;
using System.Threading;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.CSharp.Utilities;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis;
namespace ICSharpCode.NRefactory6.CSharp.Completion.KeywordRecommenders
{
internal class NewKeywordRecommender : AbstractSyntacticSingleKeywordRecommender
{
private static readonly ISet<SyntaxKind> s_validMemberModifiers = new HashSet<SyntaxKind>(SyntaxFacts.EqualityComparer)
{
SyntaxKind.AbstractKeyword,
SyntaxKind.ExternKeyword,
SyntaxKind.InternalKeyword,
SyntaxKind.PublicKeyword,
SyntaxKind.PrivateKeyword,
SyntaxKind.ProtectedKeyword,
SyntaxKind.ReadOnlyKeyword,
SyntaxKind.SealedKeyword,
SyntaxKind.StaticKeyword,
SyntaxKind.UnsafeKeyword,
SyntaxKind.VirtualKeyword,
SyntaxKind.VolatileKeyword,
};
protected static readonly ISet<SyntaxKind> ValidTypeModifiers = new HashSet<SyntaxKind>(SyntaxFacts.EqualityComparer)
{
SyntaxKind.AbstractKeyword,
SyntaxKind.InternalKeyword,
SyntaxKind.PublicKeyword,
SyntaxKind.PrivateKeyword,
SyntaxKind.ProtectedKeyword,
SyntaxKind.SealedKeyword,
SyntaxKind.StaticKeyword,
SyntaxKind.UnsafeKeyword
};
public NewKeywordRecommender()
: base(SyntaxKind.NewKeyword)
{
}
protected override bool IsValidContext(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
{
return IsValid (position, context, cancellationToken);
}
public bool IsValid(int position, CSharpSyntaxContext context, CancellationToken cancellationToken)
{
return
IsNewConstraintContext(context, cancellationToken) ||
context.IsAnyExpressionContext ||
context.IsStatementContext ||
context.IsGlobalStatementContext ||
IsMemberDeclarationContext(context, cancellationToken) ||
IsTypeDeclarationContext(context, cancellationToken);
}
private bool IsTypeDeclarationContext(CSharpSyntaxContext context, CancellationToken cancellationToken)
{
if (context.IsTypeDeclarationContext(validModifiers: ValidTypeModifiers, validTypeDeclarations: SyntaxKindSet.ClassInterfaceStructTypeDeclarations, canBePartial: false, cancellationToken: cancellationToken))
{
// we must be on a nested type.
var token = context.LeftToken;
return token.GetAncestors<TypeDeclarationSyntax>()
.Any(t => token.SpanStart > t.OpenBraceToken.Span.End &&
token.Span.End < t.CloseBraceToken.SpanStart);
}
return false;
}
private bool IsMemberDeclarationContext(CSharpSyntaxContext context, CancellationToken cancellationToken)
{
return
context.SyntaxTree.IsGlobalMemberDeclarationContext(context.Position, SyntaxKindSet.AllGlobalMemberModifiers, cancellationToken) ||
context.IsMemberDeclarationContext(
validModifiers: s_validMemberModifiers,
validTypeDeclarations: SyntaxKindSet.ClassInterfaceStructTypeDeclarations,
canBePartial: false,
cancellationToken: cancellationToken);
}
private static bool IsNewConstraintContext(CSharpSyntaxContext context, CancellationToken cancellationToken)
{
// cases:
// where T : |
// where T : class, |
// where T : Foo, |
// note: 'new()' can't come after a 'struct' constraint.
if (context.SyntaxTree.IsTypeParameterConstraintStartContext(context.Position, context.LeftToken, cancellationToken))
{
return true;
}
var token = context.TargetToken;
if (token.Kind() == SyntaxKind.CommaToken &&
token.Parent.IsKind(SyntaxKind.TypeParameterConstraintClause))
{
var constraintClause = token.Parent as TypeParameterConstraintClauseSyntax;
if (!constraintClause.Constraints
.OfType<ClassOrStructConstraintSyntax>()
.Any(c => c.ClassOrStructKeyword.Kind() == SyntaxKind.StructKeyword))
{
return true;
}
}
return false;
}
}
}
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