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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.Generic;
using System.Collections.Immutable;
using System.Composition;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Internal.Log;
using Microsoft.CodeAnalysis.NavigationBar;
using Microsoft.CodeAnalysis.PooledObjects;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Text;
using Roslyn.Utilities;
using static Microsoft.CodeAnalysis.NavigationBar.RoslynNavigationBarItem;
namespace Microsoft.CodeAnalysis.CSharp.NavigationBar
{
[ExportLanguageService(typeof(INavigationBarItemService), LanguageNames.CSharp), Shared]
internal class CSharpNavigationBarItemService : AbstractNavigationBarItemService
{
private static readonly SymbolDisplayFormat s_typeFormat =
SymbolDisplayFormat.CSharpErrorMessageFormat.AddGenericsOptions(SymbolDisplayGenericsOptions.IncludeVariance);
private static readonly SymbolDisplayFormat s_memberFormat =
new(genericsOptions: SymbolDisplayGenericsOptions.IncludeTypeParameters,
memberOptions: SymbolDisplayMemberOptions.IncludeParameters |
SymbolDisplayMemberOptions.IncludeExplicitInterface,
typeQualificationStyle: SymbolDisplayTypeQualificationStyle.NameOnly,
parameterOptions: SymbolDisplayParameterOptions.IncludeType |
SymbolDisplayParameterOptions.IncludeName |
SymbolDisplayParameterOptions.IncludeDefaultValue |
SymbolDisplayParameterOptions.IncludeParamsRefOut,
miscellaneousOptions: SymbolDisplayMiscellaneousOptions.UseSpecialTypes |
SymbolDisplayMiscellaneousOptions.AllowDefaultLiteral |
SymbolDisplayMiscellaneousOptions.IncludeNullableReferenceTypeModifier);
[ImportingConstructor]
[Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
public CSharpNavigationBarItemService()
{
}
protected override async Task<ImmutableArray<RoslynNavigationBarItem>> GetItemsInCurrentProcessAsync(
Document document, bool supportsCodeGeneration, CancellationToken cancellationToken)
{
var typesInFile = await GetTypesInFileAsync(document, cancellationToken).ConfigureAwait(false);
var tree = await document.GetRequiredSyntaxTreeAsync(cancellationToken).ConfigureAwait(false);
return GetMembersInTypes(document.Project.Solution, tree, typesInFile, cancellationToken);
}
private static ImmutableArray<RoslynNavigationBarItem> GetMembersInTypes(
Solution solution, SyntaxTree tree, IEnumerable<INamedTypeSymbol> types, CancellationToken cancellationToken)
{
using (Logger.LogBlock(FunctionId.NavigationBar_ItemService_GetMembersInTypes_CSharp, cancellationToken))
{
using var _1 = ArrayBuilder<RoslynNavigationBarItem>.GetInstance(out var items);
foreach (var type in types)
{
using var _2 = ArrayBuilder<RoslynNavigationBarItem>.GetInstance(out var memberItems);
foreach (var member in type.GetMembers())
{
if (member.IsImplicitlyDeclared ||
member.Kind == SymbolKind.NamedType ||
IsAccessor(member))
{
continue;
}
var method = member as IMethodSymbol;
if (method != null && method.PartialImplementationPart != null)
{
memberItems.AddIfNotNull(CreateItemForMember(solution, method, tree, cancellationToken));
memberItems.AddIfNotNull(CreateItemForMember(solution, method.PartialImplementationPart, tree, cancellationToken));
}
else
{
Debug.Assert(method == null || method.PartialDefinitionPart == null, "NavBar expected GetMembers to return partial method definition parts but the implementation part was returned.");
memberItems.AddIfNotNull(CreateItemForMember(solution, member, tree, cancellationToken));
}
}
memberItems.Sort((x, y) =>
{
var textComparison = x.Text.CompareTo(y.Text);
return textComparison != 0 ? textComparison : x.Grayed.CompareTo(y.Grayed);
});
var spans = GetSymbolLocation(solution, type, tree, cancellationToken);
if (spans == null)
continue;
items.Add(new SymbolItem(
type.Name,
text: type.ToDisplayString(s_typeFormat),
glyph: type.GetGlyph(),
isObsolete: type.IsObsolete(),
spans.Value,
childItems: memberItems.ToImmutable()));
}
items.Sort((x1, x2) => x1.Text.CompareTo(x2.Text));
return items.ToImmutable();
}
}
private static async Task<IEnumerable<INamedTypeSymbol>> GetTypesInFileAsync(Document document, CancellationToken cancellationToken)
{
var semanticModel = await document.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
return GetTypesInFile(semanticModel, cancellationToken);
}
private static IEnumerable<INamedTypeSymbol> GetTypesInFile(SemanticModel semanticModel, CancellationToken cancellationToken)
{
using (Logger.LogBlock(FunctionId.NavigationBar_ItemService_GetTypesInFile_CSharp, cancellationToken))
{
var types = new HashSet<INamedTypeSymbol>();
var nodesToVisit = new Stack<SyntaxNode>();
nodesToVisit.Push(semanticModel.SyntaxTree.GetRoot(cancellationToken));
while (!nodesToVisit.IsEmpty())
{
if (cancellationToken.IsCancellationRequested)
{
return SpecializedCollections.EmptyEnumerable<INamedTypeSymbol>();
}
var node = nodesToVisit.Pop();
var type = GetType(semanticModel, node, cancellationToken);
if (type != null)
{
types.Add((INamedTypeSymbol)type);
}
if (node is BaseMethodDeclarationSyntax or
BasePropertyDeclarationSyntax or
BaseFieldDeclarationSyntax or
StatementSyntax or
ExpressionSyntax)
{
// quick bail out to prevent us from creating every nodes exist in current file
continue;
}
foreach (var child in node.ChildNodes())
{
nodesToVisit.Push(child);
}
}
return types;
}
}
private static ISymbol? GetType(SemanticModel semanticModel, SyntaxNode node, CancellationToken cancellationToken)
=> node switch
{
BaseTypeDeclarationSyntax t => semanticModel.GetDeclaredSymbol(t, cancellationToken),
DelegateDeclarationSyntax d => semanticModel.GetDeclaredSymbol(d, cancellationToken),
_ => null,
};
private static bool IsAccessor(ISymbol member)
{
if (member.Kind == SymbolKind.Method)
{
var method = (IMethodSymbol)member;
return method.MethodKind is MethodKind.PropertyGet or MethodKind.PropertySet;
}
return false;
}
private static RoslynNavigationBarItem? CreateItemForMember(
Solution solution, ISymbol member, SyntaxTree tree, CancellationToken cancellationToken)
{
var location = GetSymbolLocation(solution, member, tree, cancellationToken);
if (location == null)
return null;
return new SymbolItem(
member.Name,
member.ToDisplayString(s_memberFormat),
member.GetGlyph(),
member.IsObsolete(),
location.Value);
}
private static SymbolItemLocation? GetSymbolLocation(
Solution solution, ISymbol symbol, SyntaxTree tree, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
if (symbol.Kind == SymbolKind.Field)
{
return symbol.ContainingType.TypeKind == TypeKind.Enum
? GetSymbolLocation(solution, symbol, tree, static reference => GetEnumMemberSpan(reference))
: GetSymbolLocation(solution, symbol, tree, static reference => GetFieldReferenceSpan(reference));
}
else
{
return GetSymbolLocation(solution, symbol, tree, static reference => reference.Span);
}
}
private static TextSpan GetFieldReferenceSpan(SyntaxReference reference)
{
var declaringNode = reference.GetSyntax();
var spanStart = declaringNode.SpanStart;
var spanEnd = declaringNode.Span.End;
var fieldDeclaration = declaringNode.GetAncestor<FieldDeclarationSyntax>();
if (fieldDeclaration != null)
{
var variables = fieldDeclaration.Declaration.Variables;
if (variables.FirstOrDefault() == declaringNode)
spanStart = fieldDeclaration.SpanStart;
if (variables.LastOrDefault() == declaringNode)
spanEnd = fieldDeclaration.Span.End;
}
return TextSpan.FromBounds(spanStart, spanEnd);
}
private static TextSpan GetEnumMemberSpan(SyntaxReference reference)
{
var declaringNode = reference.GetSyntax();
if (declaringNode is EnumMemberDeclarationSyntax enumMember)
{
var enumDeclaration = enumMember.GetAncestor<EnumDeclarationSyntax>();
if (enumDeclaration != null)
{
var index = enumDeclaration.Members.IndexOf(enumMember);
if (index != -1 && index < enumDeclaration.Members.SeparatorCount)
{
// Cool, we have a comma, so do it
var start = enumMember.SpanStart;
var end = enumDeclaration.Members.GetSeparator(index).Span.End;
return TextSpan.FromBounds(start, end);
}
}
}
return declaringNode.Span;
}
}
}
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