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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Immutable;
using System.Composition;
using System.Linq;
using System.Threading;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Completion;
using Microsoft.CodeAnalysis.Completion.Providers;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Text;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.CSharp.Completion.Providers;
[ExportCompletionProvider(nameof(PartialMethodCompletionProvider), LanguageNames.CSharp)]
[ExtensionOrder(After = nameof(OverrideCompletionProvider))]
[Shared]
internal sealed partial class PartialMethodCompletionProvider : AbstractPartialMethodCompletionProvider
{
[ImportingConstructor]
[Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
public PartialMethodCompletionProvider()
{
}
internal override string Language => LanguageNames.CSharp;
protected override bool IncludeAccessibility(IMethodSymbol method, CancellationToken cancellationToken)
{
var declaration = (MethodDeclarationSyntax)method.DeclaringSyntaxReferences[0].GetSyntax(cancellationToken);
foreach (var mod in declaration.Modifiers)
{
switch (mod.Kind())
{
case SyntaxKind.PublicKeyword:
case SyntaxKind.ProtectedKeyword:
case SyntaxKind.InternalKeyword:
case SyntaxKind.PrivateKeyword:
return true;
}
}
return false;
}
protected override SyntaxNode GetSyntax(SyntaxToken token)
{
return token.GetAncestor<EventFieldDeclarationSyntax>()
?? token.GetAncestor<EventDeclarationSyntax>()
?? token.GetAncestor<PropertyDeclarationSyntax>()
?? token.GetAncestor<IndexerDeclarationSyntax>()
?? (SyntaxNode?)token.GetAncestor<MethodDeclarationSyntax>()
?? throw ExceptionUtilities.UnexpectedValue(token);
}
protected override int GetTargetCaretPosition(SyntaxNode caretTarget)
{
var methodDeclaration = (MethodDeclarationSyntax)caretTarget;
return CompletionUtilities.GetTargetCaretPositionForMethod(methodDeclaration).GetLocation().SourceSpan.End;
}
protected override SyntaxToken GetToken(CompletionItem completionItem, SyntaxTree tree, CancellationToken cancellationToken)
{
var tokenSpanEnd = MemberInsertionCompletionItem.GetTokenSpanEnd(completionItem);
return tree.FindTokenOnLeftOfPosition(tokenSpanEnd, cancellationToken);
}
public override bool IsInsertionTrigger(SourceText text, int characterPosition, CompletionOptions options)
=> text[characterPosition] == ' ' ||
options.TriggerOnTypingLetters && CompletionUtilities.IsStartingNewWord(text, characterPosition);
public override ImmutableHashSet<char> TriggerCharacters { get; } = CompletionUtilities.SpaceTriggerCharacter;
protected override bool IsPartial(IMethodSymbol method)
{
var declarations = method.DeclaringSyntaxReferences.Select(r => r.GetSyntax()).OfType<MethodDeclarationSyntax>();
return declarations.Any(d => d.Body == null && d.Modifiers.Any(SyntaxKind.PartialKeyword));
}
protected override bool IsPartialMethodCompletionContext(SyntaxTree tree, int position, CancellationToken cancellationToken, out DeclarationModifiers modifiers, out SyntaxToken token)
{
var touchingToken = tree.FindTokenOnLeftOfPosition(position, cancellationToken);
var targetToken = touchingToken.GetPreviousTokenIfTouchingWord(position);
var text = tree.GetText(cancellationToken);
token = targetToken;
modifiers = default;
if (targetToken.Kind() is SyntaxKind.VoidKeyword or SyntaxKind.PartialKeyword ||
(targetToken.Kind() == SyntaxKind.IdentifierToken && targetToken.HasMatchingText(SyntaxKind.PartialKeyword)))
{
return !IsOnSameLine(touchingToken.GetNextToken(), touchingToken, text) &&
VerifyModifiers(tree, position, cancellationToken, out modifiers);
}
return false;
}
private static bool VerifyModifiers(SyntaxTree tree, int position, CancellationToken cancellationToken, out DeclarationModifiers modifiers)
{
var touchingToken = tree.FindTokenOnLeftOfPosition(position, cancellationToken);
var token = touchingToken.GetPreviousToken();
var foundPartial = touchingToken.IsKindOrHasMatchingText(SyntaxKind.PartialKeyword);
var foundAsync = false;
while (IsOnSameLine(token, touchingToken, tree.GetText(cancellationToken)))
{
if (token.IsKindOrHasMatchingText(SyntaxKind.AsyncKeyword))
{
foundAsync = true;
}
foundPartial = foundPartial || token.IsKindOrHasMatchingText(SyntaxKind.PartialKeyword);
token = token.GetPreviousToken();
}
modifiers = new DeclarationModifiers(isAsync: foundAsync, isPartial: true);
return foundPartial;
}
private static bool IsOnSameLine(SyntaxToken syntaxToken, SyntaxToken touchingToken, SourceText text)
{
return !syntaxToken.IsKind(SyntaxKind.None)
&& !touchingToken.IsKind(SyntaxKind.None)
&& text.Lines.IndexOf(syntaxToken.SpanStart) == text.Lines.IndexOf(touchingToken.SpanStart);
}
protected override string GetDisplayText(IMethodSymbol method, SemanticModel semanticModel, int position)
=> method.ToMinimalDisplayString(semanticModel, position, SignatureDisplayFormat);
}
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