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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.
#nullable disable
using System;
using System.Collections.Generic;
using System.Composition;
using System.Text;
using System.Threading;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Text;
namespace Microsoft.CodeAnalysis.CSharp;
[ExportLanguageService(typeof(ISyntaxTreeFactoryService), LanguageNames.CSharp), Shared]
internal partial class CSharpSyntaxTreeFactoryService : AbstractSyntaxTreeFactoryService
{
private static readonly CSharpParseOptions _parseOptionWithLatestLanguageVersion = CSharpParseOptions.Default.WithLanguageVersion(LanguageVersion.Preview);
[ImportingConstructor]
[Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
public CSharpSyntaxTreeFactoryService()
{
}
public override ParseOptions GetDefaultParseOptions()
=> CSharpParseOptions.Default;
public override ParseOptions GetDefaultParseOptionsWithLatestLanguageVersion()
=> _parseOptionWithLatestLanguageVersion;
public override ParseOptions TryParsePdbParseOptions(IReadOnlyDictionary<string, string> metadata)
{
if (!metadata.TryGetValue("language-version", out var langVersionString) ||
!LanguageVersionFacts.TryParse(langVersionString, out var langVersion))
{
langVersion = LanguageVersion.Default;
}
return new CSharpParseOptions(
languageVersion: langVersion,
preprocessorSymbols: metadata.TryGetValue("define", out var defines) ? defines.Split(',') : null);
}
public override bool OptionsDifferOnlyByPreprocessorDirectives(ParseOptions options1, ParseOptions options2)
{
var csharpOptions1 = (CSharpParseOptions)options1;
var csharpOptions2 = (CSharpParseOptions)options2;
// The easy way to figure out if these only differ by a single field is to update one with the preprocessor symbols of the
// other, and then do an equality check from there; this is future proofed if another value is ever added.
return csharpOptions1.WithPreprocessorSymbols(csharpOptions2.PreprocessorSymbolNames) == csharpOptions2;
}
public override SyntaxTree CreateSyntaxTree(string filePath, ParseOptions options, SourceText text, Encoding encoding, SourceHashAlgorithm checksumAlgorithm, SyntaxNode root)
{
options ??= GetDefaultParseOptions();
return new ParsedSyntaxTree(text, (CSharpSyntaxNode)root, (CSharpParseOptions)options, filePath, encoding, checksumAlgorithm);
}
public override SyntaxTree ParseSyntaxTree(string filePath, ParseOptions options, SourceText text, CancellationToken cancellationToken)
{
options ??= GetDefaultParseOptions();
return SyntaxFactory.ParseSyntaxTree(text, options, filePath, cancellationToken: cancellationToken);
}
}
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