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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.Diagnostics;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.CSharp
{
internal enum MessageID
{
None = 0,
MessageBase = 1200,
IDS_SK_METHOD = MessageBase + 2000,
IDS_SK_TYPE = MessageBase + 2001,
IDS_SK_NAMESPACE = MessageBase + 2002,
IDS_SK_FIELD = MessageBase + 2003,
IDS_SK_PROPERTY = MessageBase + 2004,
IDS_SK_UNKNOWN = MessageBase + 2005,
IDS_SK_VARIABLE = MessageBase + 2006,
IDS_SK_EVENT = MessageBase + 2007,
IDS_SK_TYVAR = MessageBase + 2008,
//IDS_SK_GCLASS = MessageBase + 2009,
IDS_SK_ALIAS = MessageBase + 2010,
//IDS_SK_EXTERNALIAS = MessageBase + 2011,
IDS_SK_LABEL = MessageBase + 2012,
IDS_SK_CONSTRUCTOR = MessageBase + 2013,
IDS_NULL = MessageBase + 10001,
//IDS_RELATEDERROR = MessageBase + 10002,
//IDS_RELATEDWARNING = MessageBase + 10003,
IDS_XMLIGNORED = MessageBase + 10004,
IDS_XMLIGNORED2 = MessageBase + 10005,
IDS_XMLFAILEDINCLUDE = MessageBase + 10006,
IDS_XMLBADINCLUDE = MessageBase + 10007,
IDS_XMLNOINCLUDE = MessageBase + 10008,
IDS_XMLMISSINGINCLUDEFILE = MessageBase + 10009,
IDS_XMLMISSINGINCLUDEPATH = MessageBase + 10010,
IDS_GlobalNamespace = MessageBase + 10011,
IDS_FeatureGenerics = MessageBase + 12500,
IDS_FeatureAnonDelegates = MessageBase + 12501,
IDS_FeatureModuleAttrLoc = MessageBase + 12502,
IDS_FeatureGlobalNamespace = MessageBase + 12503,
IDS_FeatureFixedBuffer = MessageBase + 12504,
IDS_FeaturePragma = MessageBase + 12505,
IDS_FOREACHLOCAL = MessageBase + 12506,
IDS_USINGLOCAL = MessageBase + 12507,
IDS_FIXEDLOCAL = MessageBase + 12508,
IDS_FeatureStaticClasses = MessageBase + 12511,
IDS_FeaturePartialTypes = MessageBase + 12512,
IDS_MethodGroup = MessageBase + 12513,
IDS_AnonMethod = MessageBase + 12514,
IDS_FeatureSwitchOnBool = MessageBase + 12517,
//IDS_WarnAsError = MessageBase + 12518,
IDS_Collection = MessageBase + 12520,
IDS_FeaturePropertyAccessorMods = MessageBase + 12522,
IDS_FeatureExternAlias = MessageBase + 12523,
IDS_FeatureIterators = MessageBase + 12524,
IDS_FeatureDefault = MessageBase + 12525,
IDS_FeatureNullable = MessageBase + 12528,
IDS_Lambda = MessageBase + 12531,
IDS_FeaturePatternMatching = MessageBase + 12532,
IDS_FeatureThrowExpression = MessageBase + 12533,
IDS_FeatureImplicitArray = MessageBase + 12557,
IDS_FeatureImplicitLocal = MessageBase + 12558,
IDS_FeatureAnonymousTypes = MessageBase + 12559,
IDS_FeatureAutoImplementedProperties = MessageBase + 12560,
IDS_FeatureObjectInitializer = MessageBase + 12561,
IDS_FeatureCollectionInitializer = MessageBase + 12562,
IDS_FeatureLambda = MessageBase + 12563,
IDS_FeatureQueryExpression = MessageBase + 12564,
IDS_FeatureExtensionMethod = MessageBase + 12565,
IDS_FeaturePartialMethod = MessageBase + 12566,
IDS_FeatureDynamic = MessageBase + 12644,
IDS_FeatureTypeVariance = MessageBase + 12645,
IDS_FeatureNamedArgument = MessageBase + 12646,
IDS_FeatureOptionalParameter = MessageBase + 12647,
IDS_FeatureExceptionFilter = MessageBase + 12648,
IDS_FeatureAutoPropertyInitializer = MessageBase + 12649,
IDS_SK_TYPE_OR_NAMESPACE = MessageBase + 12652,
IDS_SK_ARRAY = MessageBase + 12653,
IDS_SK_POINTER = MessageBase + 12654,
IDS_SK_FUNCTION_POINTER = MessageBase + 12655,
IDS_SK_DYNAMIC = MessageBase + 12656,
IDS_Contravariant = MessageBase + 12659,
IDS_Contravariantly = MessageBase + 12660,
IDS_Covariant = MessageBase + 12661,
IDS_Covariantly = MessageBase + 12662,
IDS_Invariantly = MessageBase + 12663,
IDS_FeatureAsync = MessageBase + 12668,
IDS_FeatureStaticAnonymousFunction = MessageBase + 12669,
IDS_LIB_ENV = MessageBase + 12680,
IDS_LIB_OPTION = MessageBase + 12681,
IDS_REFERENCEPATH_OPTION = MessageBase + 12682,
IDS_DirectoryDoesNotExist = MessageBase + 12683,
IDS_DirectoryHasInvalidPath = MessageBase + 12684,
IDS_Namespace1 = MessageBase + 12685,
IDS_PathList = MessageBase + 12686,
IDS_Text = MessageBase + 12687,
IDS_FeatureDiscards = MessageBase + 12688,
IDS_FeatureDefaultTypeParameterConstraint = MessageBase + 12689,
IDS_FeatureNullPropagatingOperator = MessageBase + 12690,
IDS_FeatureExpressionBodiedMethod = MessageBase + 12691,
IDS_FeatureExpressionBodiedProperty = MessageBase + 12692,
IDS_FeatureExpressionBodiedIndexer = MessageBase + 12693,
// IDS_VersionExperimental = MessageBase + 12694,
IDS_FeatureNameof = MessageBase + 12695,
IDS_FeatureDictionaryInitializer = MessageBase + 12696,
IDS_ToolName = MessageBase + 12697,
IDS_LogoLine1 = MessageBase + 12698,
IDS_LogoLine2 = MessageBase + 12699,
IDS_CSCHelp = MessageBase + 12700,
IDS_FeatureUsingStatic = MessageBase + 12701,
IDS_FeatureInterpolatedStrings = MessageBase + 12702,
IDS_OperationCausedStackOverflow = MessageBase + 12703,
IDS_AwaitInCatchAndFinally = MessageBase + 12704,
IDS_FeatureReadonlyAutoImplementedProperties = MessageBase + 12705,
IDS_FeatureBinaryLiteral = MessageBase + 12706,
IDS_FeatureDigitSeparator = MessageBase + 12707,
IDS_FeatureLocalFunctions = MessageBase + 12708,
IDS_FeatureNullableReferenceTypes = MessageBase + 12709,
IDS_FeatureRefLocalsReturns = MessageBase + 12710,
IDS_FeatureTuples = MessageBase + 12711,
IDS_FeatureOutVar = MessageBase + 12713,
// IDS_FeaturePragmaWarningEnable = MessageBase + 12714,
IDS_FeatureExpressionBodiedAccessor = MessageBase + 12715,
IDS_FeatureExpressionBodiedDeOrConstructor = MessageBase + 12716,
IDS_ThrowExpression = MessageBase + 12717,
IDS_FeatureDefaultLiteral = MessageBase + 12718,
IDS_FeatureInferredTupleNames = MessageBase + 12719,
IDS_FeatureGenericPatternMatching = MessageBase + 12720,
IDS_FeatureAsyncMain = MessageBase + 12721,
IDS_LangVersions = MessageBase + 12722,
IDS_FeatureLeadingDigitSeparator = MessageBase + 12723,
IDS_FeatureNonTrailingNamedArguments = MessageBase + 12724,
IDS_FeatureReadOnlyReferences = MessageBase + 12725,
IDS_FeatureRefStructs = MessageBase + 12726,
IDS_FeatureReadOnlyStructs = MessageBase + 12727,
IDS_FeatureRefExtensionMethods = MessageBase + 12728,
// IDS_StackAllocExpression = MessageBase + 12729,
IDS_FeaturePrivateProtected = MessageBase + 12730,
IDS_FeatureRefConditional = MessageBase + 12731,
IDS_FeatureAttributesOnBackingFields = MessageBase + 12732,
IDS_FeatureImprovedOverloadCandidates = MessageBase + 12733,
IDS_FeatureRefReassignment = MessageBase + 12734,
IDS_FeatureRefFor = MessageBase + 12735,
IDS_FeatureRefForEach = MessageBase + 12736,
IDS_FeatureEnumGenericTypeConstraint = MessageBase + 12737,
IDS_FeatureDelegateGenericTypeConstraint = MessageBase + 12738,
IDS_FeatureUnmanagedGenericTypeConstraint = MessageBase + 12739,
IDS_FeatureStackAllocInitializer = MessageBase + 12740,
IDS_FeatureTupleEquality = MessageBase + 12741,
IDS_FeatureExpressionVariablesInQueriesAndInitializers = MessageBase + 12742,
IDS_FeatureExtensibleFixedStatement = MessageBase + 12743,
IDS_FeatureIndexingMovableFixedBuffers = MessageBase + 12744,
IDS_FeatureAltInterpolatedVerbatimStrings = MessageBase + 12745,
IDS_FeatureCoalesceAssignmentExpression = MessageBase + 12746,
IDS_FeatureUnconstrainedTypeParameterInNullCoalescingOperator = MessageBase + 12747,
IDS_FeatureNotNullGenericTypeConstraint = MessageBase + 12748,
IDS_FeatureIndexOperator = MessageBase + 12749,
IDS_FeatureRangeOperator = MessageBase + 12750,
IDS_FeatureAsyncStreams = MessageBase + 12751,
IDS_FeatureRecursivePatterns = MessageBase + 12752,
IDS_Disposable = MessageBase + 12753,
IDS_FeatureUsingDeclarations = MessageBase + 12754,
IDS_FeatureStaticLocalFunctions = MessageBase + 12755,
IDS_FeatureNameShadowingInNestedFunctions = MessageBase + 12756,
IDS_FeatureUnmanagedConstructedTypes = MessageBase + 12757,
IDS_FeatureObsoleteOnPropertyAccessor = MessageBase + 12758,
IDS_FeatureReadOnlyMembers = MessageBase + 12759,
IDS_DefaultInterfaceImplementation = MessageBase + 12760,
IDS_OverrideWithConstraints = MessageBase + 12761,
IDS_FeatureNestedStackalloc = MessageBase + 12762,
IDS_FeatureSwitchExpression = MessageBase + 12763,
IDS_FeatureAsyncUsing = MessageBase + 12764,
IDS_FeatureLambdaDiscardParameters = MessageBase + 12765,
IDS_FeatureLocalFunctionAttributes = MessageBase + 12766,
IDS_FeatureExternLocalFunctions = MessageBase + 12767,
IDS_FeatureMemberNotNull = MessageBase + 12768,
IDS_FeatureNativeInt = MessageBase + 12769,
IDS_FeatureImplicitObjectCreation = MessageBase + 12770,
IDS_FeatureTypePattern = MessageBase + 12771,
IDS_FeatureParenthesizedPattern = MessageBase + 12772,
IDS_FeatureOrPattern = MessageBase + 12773,
IDS_FeatureAndPattern = MessageBase + 12774,
IDS_FeatureNotPattern = MessageBase + 12775,
IDS_FeatureRelationalPattern = MessageBase + 12776,
IDS_FeatureExtendedPartialMethods = MessageBase + 12777,
IDS_TopLevelStatements = MessageBase + 12778,
IDS_FeatureFunctionPointers = MessageBase + 12779,
IDS_AddressOfMethodGroup = MessageBase + 12780,
IDS_FeatureInitOnlySetters = MessageBase + 12781,
IDS_FeatureRecords = MessageBase + 12782,
IDS_FeatureNullPointerConstantPattern = MessageBase + 12783,
IDS_FeatureModuleInitializers = MessageBase + 12784,
IDS_FeatureTargetTypedConditional = MessageBase + 12785,
IDS_FeatureCovariantReturnsForOverrides = MessageBase + 12786,
IDS_FeatureExtensionGetEnumerator = MessageBase + 12787,
IDS_FeatureExtensionGetAsyncEnumerator = MessageBase + 12788,
IDS_Parameter = MessageBase + 12789,
IDS_Return = MessageBase + 12790,
IDS_FeatureVarianceSafetyForStaticInterfaceMembers = MessageBase + 12791,
IDS_FeatureConstantInterpolatedStrings = MessageBase + 12792,
IDS_FeatureMixedDeclarationsAndExpressionsInDeconstruction = MessageBase + 12793,
IDS_FeatureSealedToStringInRecord = MessageBase + 12794,
IDS_FeatureRecordStructs = MessageBase + 12795,
IDS_FeatureWithOnStructs = MessageBase + 12796,
IDS_FeaturePositionalFieldsInRecords = MessageBase + 12797,
IDS_FeatureGlobalUsing = MessageBase + 12798,
IDS_FeatureInferredDelegateType = MessageBase + 12799,
IDS_FeatureLambdaAttributes = MessageBase + 12800,
IDS_FeatureWithOnAnonymousTypes = MessageBase + 12801,
IDS_FeatureExtendedPropertyPatterns = MessageBase + 12802,
IDS_FeatureStaticAbstractMembersInInterfaces = MessageBase + 12803,
IDS_FeatureLambdaReturnType = MessageBase + 12804,
IDS_AsyncMethodBuilderOverride = MessageBase + 12805,
IDS_FeatureImplicitImplementationOfNonPublicMembers = MessageBase + 12806,
// IDS_FeatureLineSpanDirective = MessageBase + 12807, // feature no longer gated on LangVer
IDS_FeatureImprovedInterpolatedStrings = MessageBase + 12808,
IDS_FeatureFileScopedNamespace = MessageBase + 12809,
IDS_FeatureParameterlessStructConstructors = MessageBase + 12810,
IDS_FeatureStructFieldInitializers = MessageBase + 12811,
IDS_FeatureGenericAttributes = MessageBase + 12812,
IDS_FeatureNewLinesInInterpolations = MessageBase + 12813,
IDS_FeatureListPattern = MessageBase + 12814,
// IDS_ParameterNullChecking = MessageBase + 12815, // feature removed from C# 11
IDS_FeatureCacheStaticMethodGroupConversion = MessageBase + 12816,
IDS_FeatureRawStringLiterals = MessageBase + 12817,
IDS_FeatureSpanCharConstantPattern = MessageBase + 12818,
IDS_FeatureDisposalPattern = MessageBase + 12819,
IDS_FeatureAutoDefaultStructs = MessageBase + 12820,
IDS_FeatureCheckedUserDefinedOperators = MessageBase + 12821,
IDS_FeatureUtf8StringLiterals = MessageBase + 12822,
IDS_FeatureUnsignedRightShift = MessageBase + 12823,
IDS_FeatureRelaxedShiftOperator = MessageBase + 12824,
IDS_FeatureRequiredMembers = MessageBase + 12825,
IDS_FeatureRefFields = MessageBase + 12826,
IDS_FeatureFileTypes = MessageBase + 12827,
IDS_ArrayAccess = MessageBase + 12828,
IDS_PointerElementAccess = MessageBase + 12829,
IDS_Missing = MessageBase + 12830,
IDS_FeatureLambdaOptionalParameters = MessageBase + 12831,
IDS_FeatureLambdaParamsArray = MessageBase + 12832,
IDS_FeaturePrimaryConstructors = MessageBase + 12833,
IDS_FeatureUsingTypeAlias = MessageBase + 12834,
IDS_FeatureInstanceMemberInNameof = MessageBase + 12835,
IDS_FeatureInlineArrays = MessageBase + 12836,
IDS_FeatureCollectionExpressions = MessageBase + 12837,
IDS_FeatureRefReadonlyParameters = MessageBase + 12838,
IDS_FeatureStringEscapeCharacter = MessageBase + 12839,
IDS_FeatureImplicitIndexerInitializer = MessageBase + 12840,
IDS_FeatureLockObject = MessageBase + 12841,
IDS_FeatureParamsCollections = MessageBase + 12842,
IDS_FeatureRefUnsafeInIteratorAsync = MessageBase + 12843,
IDS_FeatureRefStructInterfaces = MessageBase + 12844,
IDS_FeaturePartialProperties = MessageBase + 12845,
IDS_FeatureFieldKeyword = MessageBase + 12846,
IDS_FeatureAllowsRefStructConstraint = MessageBase + 12847,
IDS_OverloadResolutionPriority = MessageBase + 12848,
}
// Message IDs may refer to strings that need to be localized.
// This struct makes an IFormattable wrapper around a MessageID
internal readonly struct LocalizableErrorArgument : IFormattable
{
private readonly MessageID _id;
internal LocalizableErrorArgument(MessageID id)
{
_id = id;
}
public override string ToString()
{
return ToString(null, null);
}
public string ToString(string? format, IFormatProvider? formatProvider)
{
return ErrorFacts.GetMessage(_id, formatProvider as System.Globalization.CultureInfo);
}
}
// And this extension method makes it easy to localize MessageIDs:
internal static partial class MessageIDExtensions
{
public static LocalizableErrorArgument Localize(this MessageID id)
{
return new LocalizableErrorArgument(id);
}
// Returns the string to be used in the /features flag switch to enable the MessageID feature.
// Always call this before RequiredVersion:
// If this method returns null, call RequiredVersion and use that.
// If this method returns non-null, use that.
// Features should be mutually exclusive between RequiredFeature and RequiredVersion.
// (hence the above rule - RequiredVersion throws when RequiredFeature returns non-null)
internal static string? RequiredFeature(this MessageID feature)
{
// Check for current experimental features, if any, in the current branch.
switch (feature)
{
default:
return null;
}
}
internal static bool CheckFeatureAvailability(
this MessageID feature,
DiagnosticBag diagnostics,
SyntaxNode syntax,
Location? location = null)
{
return CheckFeatureAvailability(
feature,
diagnostics,
syntax.SyntaxTree.Options,
static tuple => tuple.location ?? tuple.syntax.Location,
(syntax, location));
}
internal static bool CheckFeatureAvailability(
this MessageID feature,
DiagnosticBag diagnostics,
SyntaxToken syntax,
Location? location = null)
{
return CheckFeatureAvailability(
feature,
diagnostics,
syntax.SyntaxTree!.Options,
static tuple => tuple.location ?? tuple.syntax.GetLocation(),
(syntax, location));
}
internal static bool CheckFeatureAvailability(
this MessageID feature,
BindingDiagnosticBag diagnostics,
SyntaxNode syntax,
Location? location = null)
{
return CheckFeatureAvailability(
feature,
diagnostics,
syntax.SyntaxTree.Options,
static tuple => tuple.location ?? tuple.syntax.Location,
(syntax, location));
}
internal static bool CheckFeatureAvailability(
this MessageID feature,
BindingDiagnosticBag diagnostics,
SyntaxToken syntax,
Location? location = null)
{
return CheckFeatureAvailability(
feature,
diagnostics,
syntax.SyntaxTree!.Options,
static tuple => tuple.location ?? tuple.syntax.GetLocation(),
(syntax, location));
}
private static bool CheckFeatureAvailability<TData>(
this MessageID feature,
DiagnosticBag diagnostics,
ParseOptions parseOptions,
Func<TData, Location> getLocation,
TData data)
{
if (GetFeatureAvailabilityDiagnosticInfo(feature, (CSharpParseOptions)parseOptions) is { } diagInfo)
{
diagnostics.Add(diagInfo, getLocation(data));
return false;
}
return true;
}
private static bool CheckFeatureAvailability<TData>(
this MessageID feature,
BindingDiagnosticBag diagnostics,
ParseOptions parseOptions,
Func<TData, Location> getLocation,
TData data)
{
if (GetFeatureAvailabilityDiagnosticInfo(feature, (CSharpParseOptions)parseOptions) is { } diagInfo)
{
diagnostics.Add(diagInfo, getLocation(data));
return false;
}
return true;
}
internal static bool CheckFeatureAvailability(
this MessageID feature,
BindingDiagnosticBag diagnostics,
Compilation compilation,
Location location)
{
if (GetFeatureAvailabilityDiagnosticInfo(feature, (CSharpCompilation)compilation) is { } diagInfo)
{
diagnostics.Add(diagInfo, location);
return false;
}
return true;
}
internal static CSDiagnosticInfo? GetFeatureAvailabilityDiagnosticInfo(this MessageID feature, CSharpParseOptions options)
=> options.IsFeatureEnabled(feature) ? null : GetDisabledFeatureDiagnosticInfo(feature, options.LanguageVersion);
internal static CSDiagnosticInfo? GetFeatureAvailabilityDiagnosticInfo(this MessageID feature, CSharpCompilation compilation)
=> compilation.IsFeatureEnabled(feature) ? null : GetDisabledFeatureDiagnosticInfo(feature, compilation.LanguageVersion);
private static CSDiagnosticInfo GetDisabledFeatureDiagnosticInfo(MessageID feature, LanguageVersion availableVersion)
{
string? requiredFeature = feature.RequiredFeature();
if (requiredFeature != null)
{
return new CSDiagnosticInfo(ErrorCode.ERR_FeatureIsExperimental, feature.Localize(), requiredFeature);
}
LanguageVersion requiredVersion = feature.RequiredVersion();
return requiredVersion == LanguageVersion.Preview.MapSpecifiedToEffectiveVersion()
? new CSDiagnosticInfo(ErrorCode.ERR_FeatureInPreview, feature.Localize())
: new CSDiagnosticInfo(availableVersion.GetErrorCode(), feature.Localize(), new CSharpRequiredLanguageVersion(requiredVersion));
}
internal static LanguageVersion RequiredVersion(this MessageID feature)
{
Debug.Assert(RequiredFeature(feature) == null);
// Based on CSourceParser::GetFeatureUsage from SourceParser.cpp.
// Checks are in the LanguageParser unless otherwise noted.
switch (feature)
{
// PREFER reporting diagnostics in binding when diagnostics do not affect the shape of the syntax tree
// C# preview features.
case MessageID.IDS_FeatureFieldKeyword:
return LanguageVersion.Preview;
// C# 13.0 features.
case MessageID.IDS_FeatureStringEscapeCharacter: // lexer check
case MessageID.IDS_FeatureImplicitIndexerInitializer:
case MessageID.IDS_FeatureLockObject:
case MessageID.IDS_FeatureParamsCollections:
case MessageID.IDS_FeatureRefUnsafeInIteratorAsync:
case MessageID.IDS_FeatureRefStructInterfaces:
case MessageID.IDS_FeatureAllowsRefStructConstraint:
case MessageID.IDS_FeaturePartialProperties:
case MessageID.IDS_OverloadResolutionPriority:
return LanguageVersion.CSharp13;
// C# 12.0 features.
case MessageID.IDS_FeatureLambdaOptionalParameters: // semantic check
case MessageID.IDS_FeatureLambdaParamsArray: // semantic check
case MessageID.IDS_FeaturePrimaryConstructors: // declaration table check
case MessageID.IDS_FeatureUsingTypeAlias: // semantic check
case MessageID.IDS_FeatureInstanceMemberInNameof: // semantic check
case MessageID.IDS_FeatureInlineArrays: // semantic check
case MessageID.IDS_FeatureCollectionExpressions: // semantic check
case MessageID.IDS_FeatureRefReadonlyParameters: // semantic check
return LanguageVersion.CSharp12;
// C# 11.0 features.
case MessageID.IDS_FeatureRawStringLiterals:
case MessageID.IDS_FeatureStaticAbstractMembersInInterfaces: // semantic check
case MessageID.IDS_FeatureNewLinesInInterpolations: // semantic check
case MessageID.IDS_FeatureListPattern: // semantic check
case MessageID.IDS_FeatureRequiredMembers: // semantic check
case MessageID.IDS_FeatureCacheStaticMethodGroupConversion: // lowering check
case MessageID.IDS_FeatureSpanCharConstantPattern:
case MessageID.IDS_FeatureAutoDefaultStructs: // semantic check
case MessageID.IDS_FeatureCheckedUserDefinedOperators: // semantic check for declarations, parsing check for doc comments
case MessageID.IDS_FeatureUtf8StringLiterals: // semantic check
case MessageID.IDS_FeatureUnsignedRightShift: // semantic check for declarations and consumption, parsing check for doc comments
case MessageID.IDS_FeatureRelaxedShiftOperator: // semantic check
case MessageID.IDS_FeatureRefFields: // semantic check
case MessageID.IDS_FeatureFileTypes: // semantic check
case MessageID.IDS_FeatureGenericAttributes: // semantic check
return LanguageVersion.CSharp11;
// C# 10.0 features.
case MessageID.IDS_FeatureMixedDeclarationsAndExpressionsInDeconstruction: // semantic check
case MessageID.IDS_FeatureSealedToStringInRecord: // semantic check
case MessageID.IDS_FeatureImprovedInterpolatedStrings: // semantic check
case MessageID.IDS_FeatureRecordStructs:
case MessageID.IDS_FeatureWithOnStructs: // semantic check
case MessageID.IDS_FeatureWithOnAnonymousTypes: // semantic check
case MessageID.IDS_FeaturePositionalFieldsInRecords: // semantic check
case MessageID.IDS_FeatureGlobalUsing:
case MessageID.IDS_FeatureInferredDelegateType: // semantic check
case MessageID.IDS_FeatureLambdaAttributes: // semantic check
case MessageID.IDS_FeatureExtendedPropertyPatterns: // semantic check
case MessageID.IDS_FeatureLambdaReturnType: // semantic check
case MessageID.IDS_AsyncMethodBuilderOverride: // semantic check
case MessageID.IDS_FeatureConstantInterpolatedStrings: // semantic check
case MessageID.IDS_FeatureImplicitImplementationOfNonPublicMembers: // semantic check
case MessageID.IDS_FeatureFileScopedNamespace: // semantic check
case MessageID.IDS_FeatureParameterlessStructConstructors: // semantic check
case MessageID.IDS_FeatureStructFieldInitializers: // semantic check
return LanguageVersion.CSharp10;
// C# 9.0 features.
case MessageID.IDS_FeatureLambdaDiscardParameters: // semantic check
case MessageID.IDS_FeatureFunctionPointers: // semantic check
case MessageID.IDS_FeatureLocalFunctionAttributes: // syntax check
case MessageID.IDS_FeatureExternLocalFunctions: // semantic check
case MessageID.IDS_FeatureImplicitObjectCreation: // semantic check
case MessageID.IDS_FeatureMemberNotNull:
case MessageID.IDS_FeatureAndPattern: // semantic check
case MessageID.IDS_FeatureNotPattern: // semantic check
case MessageID.IDS_FeatureOrPattern: // semantic check
case MessageID.IDS_FeatureParenthesizedPattern: // semantic check
case MessageID.IDS_FeatureTypePattern: // semantic check
case MessageID.IDS_FeatureRelationalPattern: // semantic check
case MessageID.IDS_FeatureExtensionGetEnumerator: // semantic check
case MessageID.IDS_FeatureExtensionGetAsyncEnumerator: // semantic check
case MessageID.IDS_FeatureNativeInt:
case MessageID.IDS_FeatureExtendedPartialMethods: // semantic check
case MessageID.IDS_TopLevelStatements:
case MessageID.IDS_FeatureInitOnlySetters: // semantic check
case MessageID.IDS_FeatureRecords: // semantic check
case MessageID.IDS_FeatureTargetTypedConditional: // semantic check
case MessageID.IDS_FeatureCovariantReturnsForOverrides: // semantic check
case MessageID.IDS_FeatureStaticAnonymousFunction: // semantic check
case MessageID.IDS_FeatureModuleInitializers: // semantic check on method attribute
case MessageID.IDS_FeatureDefaultTypeParameterConstraint: // semantic check
case MessageID.IDS_FeatureVarianceSafetyForStaticInterfaceMembers: // semantic check
return LanguageVersion.CSharp9;
// C# 8.0 features.
case MessageID.IDS_FeatureAltInterpolatedVerbatimStrings: // semantic check
case MessageID.IDS_FeatureCoalesceAssignmentExpression: // semantic check
case MessageID.IDS_FeatureUnconstrainedTypeParameterInNullCoalescingOperator:
case MessageID.IDS_FeatureNullableReferenceTypes: // syntax and semantic check
case MessageID.IDS_FeatureIndexOperator: // semantic check
case MessageID.IDS_FeatureRangeOperator: // semantic check
case MessageID.IDS_FeatureAsyncStreams: // semantic check
case MessageID.IDS_FeatureRecursivePatterns: // semantic check
case MessageID.IDS_FeatureUsingDeclarations: // semantic check
case MessageID.IDS_FeatureDisposalPattern: //semantic check
case MessageID.IDS_FeatureStaticLocalFunctions: // semantic check
case MessageID.IDS_FeatureNameShadowingInNestedFunctions:
case MessageID.IDS_FeatureUnmanagedConstructedTypes: // semantic check
case MessageID.IDS_FeatureObsoleteOnPropertyAccessor:
case MessageID.IDS_FeatureReadOnlyMembers:
case MessageID.IDS_DefaultInterfaceImplementation: // semantic check
case MessageID.IDS_OverrideWithConstraints: // semantic check
case MessageID.IDS_FeatureNestedStackalloc: // semantic check
case MessageID.IDS_FeatureNotNullGenericTypeConstraint:// semantic check
case MessageID.IDS_FeatureSwitchExpression:
case MessageID.IDS_FeatureAsyncUsing:
case MessageID.IDS_FeatureNullPointerConstantPattern: //semantic check
return LanguageVersion.CSharp8;
// C# 7.3 features.
case MessageID.IDS_FeatureAttributesOnBackingFields: // semantic check
case MessageID.IDS_FeatureImprovedOverloadCandidates: // semantic check
case MessageID.IDS_FeatureTupleEquality: // semantic check
case MessageID.IDS_FeatureRefReassignment: // semantic check
case MessageID.IDS_FeatureRefFor:
case MessageID.IDS_FeatureRefForEach: // semantic check
case MessageID.IDS_FeatureEnumGenericTypeConstraint: // semantic check
case MessageID.IDS_FeatureDelegateGenericTypeConstraint: // semantic check
case MessageID.IDS_FeatureUnmanagedGenericTypeConstraint: // semantic check
case MessageID.IDS_FeatureStackAllocInitializer: // semantic check
case MessageID.IDS_FeatureExpressionVariablesInQueriesAndInitializers: // semantic check
case MessageID.IDS_FeatureExtensibleFixedStatement: // semantic check
case MessageID.IDS_FeatureIndexingMovableFixedBuffers: //semantic check
return LanguageVersion.CSharp7_3;
// C# 7.2 features.
case MessageID.IDS_FeatureNonTrailingNamedArguments: // semantic check
case MessageID.IDS_FeatureLeadingDigitSeparator:
case MessageID.IDS_FeaturePrivateProtected:
case MessageID.IDS_FeatureReadOnlyReferences: // semantic check
case MessageID.IDS_FeatureRefStructs: // semantic check
case MessageID.IDS_FeatureReadOnlyStructs: // semantic check
case MessageID.IDS_FeatureRefExtensionMethods:
case MessageID.IDS_FeatureRefConditional:
return LanguageVersion.CSharp7_2;
// C# 7.1 features.
case MessageID.IDS_FeatureAsyncMain:
case MessageID.IDS_FeatureDefaultLiteral: // semantic check
case MessageID.IDS_FeatureInferredTupleNames:
case MessageID.IDS_FeatureGenericPatternMatching:
return LanguageVersion.CSharp7_1;
// C# 7 features.
case MessageID.IDS_FeatureBinaryLiteral:
case MessageID.IDS_FeatureDigitSeparator:
case MessageID.IDS_FeatureLocalFunctions: // semantic check
case MessageID.IDS_FeatureRefLocalsReturns:
case MessageID.IDS_FeaturePatternMatching: // semantic check
case MessageID.IDS_FeatureThrowExpression: // semantic check
case MessageID.IDS_FeatureTuples:
case MessageID.IDS_FeatureOutVar: // semantic check
case MessageID.IDS_FeatureExpressionBodiedAccessor:
case MessageID.IDS_FeatureExpressionBodiedDeOrConstructor:
case MessageID.IDS_FeatureDiscards:
return LanguageVersion.CSharp7;
// C# 6 features.
case MessageID.IDS_FeatureExceptionFilter: // semantic check
case MessageID.IDS_FeatureAutoPropertyInitializer: // semantic check
case MessageID.IDS_FeatureNullPropagatingOperator: // semantic check
case MessageID.IDS_FeatureExpressionBodiedMethod:
case MessageID.IDS_FeatureExpressionBodiedProperty: // semantic check
case MessageID.IDS_FeatureExpressionBodiedIndexer: // semantic check
case MessageID.IDS_FeatureNameof:
case MessageID.IDS_FeatureDictionaryInitializer: // semantic check
case MessageID.IDS_FeatureUsingStatic: // semantic check
case MessageID.IDS_FeatureInterpolatedStrings: // semantic check
case MessageID.IDS_AwaitInCatchAndFinally:
case MessageID.IDS_FeatureReadonlyAutoImplementedProperties:
return LanguageVersion.CSharp6;
// C# 5 features.
case MessageID.IDS_FeatureAsync: // semantic check
return LanguageVersion.CSharp5;
// C# 4 features.
case MessageID.IDS_FeatureDynamic: // Checked in the binder.
case MessageID.IDS_FeatureTypeVariance: // semantic check
case MessageID.IDS_FeatureNamedArgument: // semantic check
case MessageID.IDS_FeatureOptionalParameter: // semantic check
return LanguageVersion.CSharp4;
// C# 3 features.
case MessageID.IDS_FeatureImplicitArray: // semantic check
case MessageID.IDS_FeatureAnonymousTypes: // semantic check
case MessageID.IDS_FeatureObjectInitializer:
case MessageID.IDS_FeatureCollectionInitializer:
case MessageID.IDS_FeatureLambda: // semantic check
case MessageID.IDS_FeatureQueryExpression: // semantic check
case MessageID.IDS_FeatureExtensionMethod:
case MessageID.IDS_FeaturePartialMethod: // semantic check
case MessageID.IDS_FeatureImplicitLocal: // Checked in the binder.
case MessageID.IDS_FeatureAutoImplementedProperties:
return LanguageVersion.CSharp3;
// C# 2 features.
case MessageID.IDS_FeatureGenerics: // Also affects crefs.
case MessageID.IDS_FeatureAnonDelegates: // semantic check
case MessageID.IDS_FeatureGlobalNamespace: // Also affects crefs.
case MessageID.IDS_FeatureFixedBuffer: // semantic check
case MessageID.IDS_FeatureStaticClasses: // semantic check
case MessageID.IDS_FeaturePartialTypes: // semantic check
case MessageID.IDS_FeaturePropertyAccessorMods:
case MessageID.IDS_FeatureExternAlias: // semantic check
case MessageID.IDS_FeatureIterators: // semantic check
case MessageID.IDS_FeatureDefault: // semantic check
case MessageID.IDS_FeatureNullable:
case MessageID.IDS_FeaturePragma: // Checked in the directive parser.
case MessageID.IDS_FeatureSwitchOnBool: // Checked in the binder.
return LanguageVersion.CSharp2;
// Special C# 2 feature: only a warning in C# 1.
case MessageID.IDS_FeatureModuleAttrLoc:
return LanguageVersion.CSharp1;
default:
throw ExceptionUtilities.UnexpectedValue(feature);
}
}
}
}
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