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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.Linq;
using System.Threading;
using Microsoft.CodeAnalysis;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.SignatureHelp;
/// <summary>
/// Used for C#/VB sig help providers so they can build up information using SymbolDisplayParts.
/// These parts will then by used to properly replace anonymous type information in the parts.
/// Once that it done, this will be converted to normal SignatureHelpParameters which only
/// point to TaggedText parts.
/// </summary>
internal sealed class SignatureHelpSymbolParameter(
string name,
bool isOptional,
Func<CancellationToken, IEnumerable<TaggedText>>? documentationFactory,
IEnumerable<SymbolDisplayPart> displayParts,
IEnumerable<SymbolDisplayPart>? prefixDisplayParts = null,
IEnumerable<SymbolDisplayPart>? suffixDisplayParts = null,
IEnumerable<SymbolDisplayPart>? selectedDisplayParts = null)
{
/// <summary>
/// The name of this parameter.
/// </summary>
public string Name { get; } = name ?? string.Empty;
/// <summary>
/// Documentation for this parameter. This should normally be presented to the user when
/// this parameter is selected.
/// </summary>
public Func<CancellationToken, IEnumerable<TaggedText>> DocumentationFactory { get; } = documentationFactory ?? s_emptyDocumentationFactory;
/// <summary>
/// Display parts to show before the normal display parts for the parameter.
/// </summary>
public IList<SymbolDisplayPart> PrefixDisplayParts { get; } = prefixDisplayParts.ToImmutableArrayOrEmpty();
/// <summary>
/// Display parts to show after the normal display parts for the parameter.
/// </summary>
public IList<SymbolDisplayPart> SuffixDisplayParts { get; } = suffixDisplayParts.ToImmutableArrayOrEmpty();
/// <summary>
/// Display parts for this parameter. This should normally be presented to the user as part
/// of the entire signature display.
/// </summary>
public IList<SymbolDisplayPart> DisplayParts { get; } = displayParts.ToImmutableArrayOrEmpty();
/// <summary>
/// True if this parameter is optional or not. Optional parameters may be presented in a
/// different manner to users.
/// </summary>
public bool IsOptional { get; } = isOptional;
/// <summary>
/// Display parts for this parameter that should be presented to the user when this
/// parameter is selected.
/// </summary>
public IList<SymbolDisplayPart> SelectedDisplayParts { get; } = selectedDisplayParts.ToImmutableArrayOrEmpty();
private static readonly Func<CancellationToken, IEnumerable<TaggedText>> s_emptyDocumentationFactory = _ => [];
internal IEnumerable<SymbolDisplayPart> GetAllParts()
{
return PrefixDisplayParts.Concat(DisplayParts)
.Concat(SuffixDisplayParts)
.Concat(SelectedDisplayParts);
}
public static explicit operator SignatureHelpParameter(SignatureHelpSymbolParameter parameter)
{
return new SignatureHelpParameter(
parameter.Name, parameter.IsOptional, parameter.DocumentationFactory,
parameter.DisplayParts.ToTaggedText(),
parameter.PrefixDisplayParts.ToTaggedText(),
parameter.SuffixDisplayParts.ToTaggedText(),
parameter.SelectedDisplayParts.ToTaggedText());
}
}
internal sealed class SignatureHelpParameter(
string name,
bool isOptional,
Func<CancellationToken, IEnumerable<TaggedText>>? documentationFactory,
IEnumerable<TaggedText> displayParts,
IEnumerable<TaggedText>? prefixDisplayParts = null,
IEnumerable<TaggedText>? suffixDisplayParts = null,
IEnumerable<TaggedText>? selectedDisplayParts = null)
{
/// <summary>
/// The name of this parameter.
/// </summary>
public string Name { get; } = name ?? string.Empty;
/// <summary>
/// Documentation for this parameter. This should normally be presented to the user when
/// this parameter is selected.
/// </summary>
public Func<CancellationToken, IEnumerable<TaggedText>> DocumentationFactory { get; } = documentationFactory ?? s_emptyDocumentationFactory;
/// <summary>
/// Display parts to show before the normal display parts for the parameter.
/// </summary>
public IList<TaggedText> PrefixDisplayParts { get; } = prefixDisplayParts.ToImmutableArrayOrEmpty();
/// <summary>
/// Display parts to show after the normal display parts for the parameter.
/// </summary>
public IList<TaggedText> SuffixDisplayParts { get; } = suffixDisplayParts.ToImmutableArrayOrEmpty();
/// <summary>
/// Display parts for this parameter. This should normally be presented to the user as part
/// of the entire signature display.
/// </summary>
public IList<TaggedText> DisplayParts { get; } = displayParts.ToImmutableArrayOrEmpty();
/// <summary>
/// True if this parameter is optional or not. Optional parameters may be presented in a
/// different manner to users.
/// </summary>
public bool IsOptional { get; } = isOptional;
/// <summary>
/// Display parts for this parameter that should be presented to the user when this
/// parameter is selected.
/// </summary>
public IList<TaggedText> SelectedDisplayParts { get; } = selectedDisplayParts.ToImmutableArrayOrEmpty();
private static readonly Func<CancellationToken, IEnumerable<TaggedText>> s_emptyDocumentationFactory = _ => [];
// Constructor kept for binary compat with TS. Remove when they move to the new API.
public SignatureHelpParameter(
string name,
bool isOptional,
Func<CancellationToken, IEnumerable<SymbolDisplayPart>>? documentationFactory,
IEnumerable<SymbolDisplayPart> displayParts,
IEnumerable<SymbolDisplayPart>? prefixDisplayParts = null,
IEnumerable<SymbolDisplayPart>? suffixDisplayParts = null,
IEnumerable<SymbolDisplayPart>? selectedDisplayParts = null)
: this(name, isOptional,
documentationFactory is null ? null : c => documentationFactory(c).ToTaggedText(),
displayParts.ToTaggedText(),
prefixDisplayParts.ToTaggedText(),
suffixDisplayParts.ToTaggedText(),
selectedDisplayParts.ToTaggedText())
{
}
internal IEnumerable<TaggedText> GetAllParts()
{
return PrefixDisplayParts.Concat(DisplayParts)
.Concat(SuffixDisplayParts)
.Concat(SelectedDisplayParts);
}
public override string ToString()
{
var prefix = string.Concat(PrefixDisplayParts);
var display = string.Concat(DisplayParts);
var suffix = string.Concat(SuffixDisplayParts);
return string.Concat(prefix, display, suffix);
}
}
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