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LanguageFeatures.fs
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LanguageFeatures.fs
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// Copyright (c) Microsoft Corporation. All Rights Reserved. See License.txt in the project root for license information.
/// Coordinating compiler operations - configuration, loading initial context, reporting errors etc.
module internal FSharp.Compiler.Features
//------------------------------------------------------------------------------------------------------------------
// Language version command line switch
//------------------------------------------------------------------------------------------------------------------
// Add your features to this List - in code use languageVersion.SupportsFeature(LanguageFeatures.yourFeature)
// a return value of false means your feature is not supported by the user's language selection
// All new language features added from now on must be protected by this.
// Note:
// * The fslang design process will require a decision about feature name and whether it is required.
// * When a feature is assigned a release language, we will scrub the code of feature references and apply
// the Release Language version.
[<RequireQualifiedAccess>]
type LanguageFeature =
| SingleUnderscorePattern
| WildCardInForLoop
| RelaxWhitespace
| RelaxWhitespace2
| StrictIndentation
| NameOf
| ImplicitYield
| OpenTypeDeclaration
| DotlessFloat32Literal
| PackageManagement
| FromEndSlicing
| FixedIndexSlice3d4d
| AndBang
| ResumableStateMachines
| NullableOptionalInterop
| DefaultInterfaceMemberConsumption
| WitnessPassing
| AdditionalTypeDirectedConversions
| InterfacesWithMultipleGenericInstantiation
| StringInterpolation
| OverloadsForCustomOperations
| ExpandedMeasurables
| StructActivePattern
| PrintfBinaryFormat
| IndexerNotationWithoutDot
| RefCellNotationInformationals
| UseBindingValueDiscard
| NonVariablePatternsToRightOfAsPatterns
| AttributesToRightOfModuleKeyword
| MLCompatRevisions
| BetterExceptionPrinting
| DelegateTypeNameResolutionFix
| ReallyLongLists
| ErrorOnDeprecatedRequireQualifiedAccess
| RequiredPropertiesSupport
| InitPropertiesSupport
| LowercaseDUWhenRequireQualifiedAccess
| InterfacesWithAbstractStaticMembers
| SelfTypeConstraints
| AccessorFunctionShorthand
| MatchNotAllowedForUnionCaseWithNoData
| CSharpExtensionAttributeNotRequired
| ErrorForNonVirtualMembersOverrides
| WarningWhenInliningMethodImplNoInlineMarkedFunction
| EscapeDotnetFormattableStrings
| ArithmeticInLiterals
| ErrorReportingOnStaticClasses
| TryWithInSeqExpression
| WarningWhenCopyAndUpdateRecordChangesAllFields
| StaticMembersInInterfaces
| NonInlineLiteralsAsPrintfFormat
| NestedCopyAndUpdate
| ExtendedStringInterpolation
| WarningWhenMultipleRecdTypeChoice
| ImprovedImpliedArgumentNames
| DiagnosticForObjInference
| StaticLetInRecordsDusEmptyTypes
| WarningWhenTailRecAttributeButNonTailRecUsage
| WhileBang
/// LanguageVersion management
type LanguageVersion(versionText) =
// When we increment language versions here preview is higher than current RTM version
static let languageVersion46 = 4.6m
static let languageVersion47 = 4.7m
static let languageVersion50 = 5.0m
static let languageVersion60 = 6.0m
static let languageVersion70 = 7.0m
static let previewVersion = 9999m // Language version when preview specified
static let defaultVersion = languageVersion70 // Language version when default specified
static let latestVersion = defaultVersion // Language version when latest specified
static let latestMajorVersion = languageVersion70 // Language version when latestmajor specified
static let validOptions = [| "preview"; "default"; "latest"; "latestmajor" |]
static let languageVersions =
set
[|
languageVersion46
languageVersion47
languageVersion50
languageVersion60
languageVersion70
|]
static let features =
dict
[
// F# 4.7
LanguageFeature.SingleUnderscorePattern, languageVersion47
LanguageFeature.WildCardInForLoop, languageVersion47
LanguageFeature.RelaxWhitespace, languageVersion47
LanguageFeature.ImplicitYield, languageVersion47
// F# 5.0
LanguageFeature.FixedIndexSlice3d4d, languageVersion50
LanguageFeature.DotlessFloat32Literal, languageVersion50
LanguageFeature.AndBang, languageVersion50
LanguageFeature.NullableOptionalInterop, languageVersion50
LanguageFeature.DefaultInterfaceMemberConsumption, languageVersion50
LanguageFeature.OpenTypeDeclaration, languageVersion50
LanguageFeature.PackageManagement, languageVersion50
LanguageFeature.WitnessPassing, languageVersion50
LanguageFeature.InterfacesWithMultipleGenericInstantiation, languageVersion50
LanguageFeature.NameOf, languageVersion50
LanguageFeature.StringInterpolation, languageVersion50
// F# 6.0
LanguageFeature.AdditionalTypeDirectedConversions, languageVersion60
LanguageFeature.RelaxWhitespace2, languageVersion60
LanguageFeature.OverloadsForCustomOperations, languageVersion60
LanguageFeature.ExpandedMeasurables, languageVersion60
LanguageFeature.ResumableStateMachines, languageVersion60
LanguageFeature.StructActivePattern, languageVersion60
LanguageFeature.PrintfBinaryFormat, languageVersion60
LanguageFeature.IndexerNotationWithoutDot, languageVersion60
LanguageFeature.RefCellNotationInformationals, languageVersion60
LanguageFeature.UseBindingValueDiscard, languageVersion60
LanguageFeature.NonVariablePatternsToRightOfAsPatterns, languageVersion60
LanguageFeature.AttributesToRightOfModuleKeyword, languageVersion60
LanguageFeature.DelegateTypeNameResolutionFix, languageVersion60
// F# 7.0
LanguageFeature.MLCompatRevisions, languageVersion70
LanguageFeature.BetterExceptionPrinting, languageVersion70
LanguageFeature.ReallyLongLists, languageVersion70
LanguageFeature.ErrorOnDeprecatedRequireQualifiedAccess, languageVersion70
LanguageFeature.RequiredPropertiesSupport, languageVersion70
LanguageFeature.InitPropertiesSupport, languageVersion70
LanguageFeature.LowercaseDUWhenRequireQualifiedAccess, languageVersion70
LanguageFeature.InterfacesWithAbstractStaticMembers, languageVersion70
LanguageFeature.SelfTypeConstraints, languageVersion70
// F# preview
LanguageFeature.FromEndSlicing, previewVersion
LanguageFeature.AccessorFunctionShorthand, previewVersion
LanguageFeature.MatchNotAllowedForUnionCaseWithNoData, previewVersion
LanguageFeature.CSharpExtensionAttributeNotRequired, previewVersion
LanguageFeature.ErrorForNonVirtualMembersOverrides, previewVersion
LanguageFeature.WarningWhenInliningMethodImplNoInlineMarkedFunction, previewVersion
LanguageFeature.EscapeDotnetFormattableStrings, previewVersion
LanguageFeature.ArithmeticInLiterals, previewVersion
LanguageFeature.ErrorReportingOnStaticClasses, previewVersion
LanguageFeature.TryWithInSeqExpression, previewVersion
LanguageFeature.WarningWhenCopyAndUpdateRecordChangesAllFields, previewVersion
LanguageFeature.StaticMembersInInterfaces, previewVersion
LanguageFeature.NonInlineLiteralsAsPrintfFormat, previewVersion
LanguageFeature.NestedCopyAndUpdate, previewVersion
LanguageFeature.ExtendedStringInterpolation, previewVersion
LanguageFeature.WarningWhenMultipleRecdTypeChoice, previewVersion
LanguageFeature.ImprovedImpliedArgumentNames, previewVersion
LanguageFeature.DiagnosticForObjInference, previewVersion
LanguageFeature.WarningWhenTailRecAttributeButNonTailRecUsage, previewVersion
LanguageFeature.StaticLetInRecordsDusEmptyTypes, previewVersion
LanguageFeature.StrictIndentation, previewVersion
LanguageFeature.WhileBang, previewVersion
]
static let defaultLanguageVersion = LanguageVersion("default")
static let getVersionFromString (version: string) =
match version.ToUpperInvariant() with
| "?" -> 0m
| "PREVIEW" -> previewVersion
| "DEFAULT" -> defaultVersion
| "LATEST" -> latestVersion
| "LATESTMAJOR" -> latestMajorVersion
| "4.6" -> languageVersion46
| "4.7" -> languageVersion47
| "5.0"
| "5" -> languageVersion50
| "6.0"
| "6" -> languageVersion60
| "7.0"
| "7" -> languageVersion70
| _ -> 0m
let specified = getVersionFromString versionText
static let versionToString v =
if v = previewVersion then "'PREVIEW'" else string v
let specifiedString = versionToString specified
/// Check if this feature is supported by the selected langversion
member _.SupportsFeature featureId =
match features.TryGetValue featureId with
| true, v -> v <= specified
| false, _ -> false
/// Has preview been explicitly specified
member _.IsExplicitlySpecifiedAs50OrBefore() =
let v = getVersionFromString versionText
v <> 0.0m && v <= 5.0m
/// Has preview been explicitly specified
member _.IsPreviewEnabled = specified = previewVersion
/// Does the languageVersion support this version string
static member ContainsVersion version =
let langVersion = getVersionFromString version
langVersion <> 0m && languageVersions.Contains langVersion
/// Get a list of valid strings for help text
static member ValidOptions = validOptions
/// Get a list of valid versions for help text
static member ValidVersions =
[|
for v in languageVersions |> Seq.sort -> sprintf "%M%s" v (if v = defaultVersion then " (Default)" else "")
|]
/// Get the text used to specify the version
member _.VersionText = versionText
/// Get the specified LanguageVersion
member _.SpecifiedVersion = specified
/// Get the specified LanguageVersion as a string
member _.SpecifiedVersionString = specifiedString
/// Get a string name for the given feature.
static member GetFeatureString feature =
match feature with
| LanguageFeature.SingleUnderscorePattern -> FSComp.SR.featureSingleUnderscorePattern ()
| LanguageFeature.WildCardInForLoop -> FSComp.SR.featureWildCardInForLoop ()
| LanguageFeature.RelaxWhitespace -> FSComp.SR.featureRelaxWhitespace ()
| LanguageFeature.RelaxWhitespace2 -> FSComp.SR.featureRelaxWhitespace2 ()
| LanguageFeature.NameOf -> FSComp.SR.featureNameOf ()
| LanguageFeature.ImplicitYield -> FSComp.SR.featureImplicitYield ()
| LanguageFeature.OpenTypeDeclaration -> FSComp.SR.featureOpenTypeDeclaration ()
| LanguageFeature.DotlessFloat32Literal -> FSComp.SR.featureDotlessFloat32Literal ()
| LanguageFeature.PackageManagement -> FSComp.SR.featurePackageManagement ()
| LanguageFeature.FromEndSlicing -> FSComp.SR.featureFromEndSlicing ()
| LanguageFeature.FixedIndexSlice3d4d -> FSComp.SR.featureFixedIndexSlice3d4d ()
| LanguageFeature.AndBang -> FSComp.SR.featureAndBang ()
| LanguageFeature.ResumableStateMachines -> FSComp.SR.featureResumableStateMachines ()
| LanguageFeature.NullableOptionalInterop -> FSComp.SR.featureNullableOptionalInterop ()
| LanguageFeature.DefaultInterfaceMemberConsumption -> FSComp.SR.featureDefaultInterfaceMemberConsumption ()
| LanguageFeature.WitnessPassing -> FSComp.SR.featureWitnessPassing ()
| LanguageFeature.AdditionalTypeDirectedConversions -> FSComp.SR.featureAdditionalImplicitConversions ()
| LanguageFeature.InterfacesWithMultipleGenericInstantiation -> FSComp.SR.featureInterfacesWithMultipleGenericInstantiation ()
| LanguageFeature.StringInterpolation -> FSComp.SR.featureStringInterpolation ()
| LanguageFeature.OverloadsForCustomOperations -> FSComp.SR.featureOverloadsForCustomOperations ()
| LanguageFeature.ExpandedMeasurables -> FSComp.SR.featureExpandedMeasurables ()
| LanguageFeature.StructActivePattern -> FSComp.SR.featureStructActivePattern ()
| LanguageFeature.PrintfBinaryFormat -> FSComp.SR.featurePrintfBinaryFormat ()
| LanguageFeature.IndexerNotationWithoutDot -> FSComp.SR.featureIndexerNotationWithoutDot ()
| LanguageFeature.RefCellNotationInformationals -> FSComp.SR.featureRefCellNotationInformationals ()
| LanguageFeature.UseBindingValueDiscard -> FSComp.SR.featureDiscardUseValue ()
| LanguageFeature.NonVariablePatternsToRightOfAsPatterns -> FSComp.SR.featureNonVariablePatternsToRightOfAsPatterns ()
| LanguageFeature.AttributesToRightOfModuleKeyword -> FSComp.SR.featureAttributesToRightOfModuleKeyword ()
| LanguageFeature.MLCompatRevisions -> FSComp.SR.featureMLCompatRevisions ()
| LanguageFeature.BetterExceptionPrinting -> FSComp.SR.featureBetterExceptionPrinting ()
| LanguageFeature.DelegateTypeNameResolutionFix -> FSComp.SR.featureDelegateTypeNameResolutionFix ()
| LanguageFeature.ReallyLongLists -> FSComp.SR.featureReallyLongList ()
| LanguageFeature.ErrorOnDeprecatedRequireQualifiedAccess -> FSComp.SR.featureErrorOnDeprecatedRequireQualifiedAccess ()
| LanguageFeature.RequiredPropertiesSupport -> FSComp.SR.featureRequiredProperties ()
| LanguageFeature.InitPropertiesSupport -> FSComp.SR.featureInitProperties ()
| LanguageFeature.LowercaseDUWhenRequireQualifiedAccess -> FSComp.SR.featureLowercaseDUWhenRequireQualifiedAccess ()
| LanguageFeature.InterfacesWithAbstractStaticMembers -> FSComp.SR.featureInterfacesWithAbstractStaticMembers ()
| LanguageFeature.SelfTypeConstraints -> FSComp.SR.featureSelfTypeConstraints ()
| LanguageFeature.AccessorFunctionShorthand -> FSComp.SR.featureAccessorFunctionShorthand ()
| LanguageFeature.MatchNotAllowedForUnionCaseWithNoData -> FSComp.SR.featureMatchNotAllowedForUnionCaseWithNoData ()
| LanguageFeature.CSharpExtensionAttributeNotRequired -> FSComp.SR.featureCSharpExtensionAttributeNotRequired ()
| LanguageFeature.ErrorForNonVirtualMembersOverrides -> FSComp.SR.featureErrorForNonVirtualMembersOverrides ()
| LanguageFeature.WarningWhenInliningMethodImplNoInlineMarkedFunction ->
FSComp.SR.featureWarningWhenInliningMethodImplNoInlineMarkedFunction ()
| LanguageFeature.EscapeDotnetFormattableStrings -> FSComp.SR.featureEscapeBracesInFormattableString ()
| LanguageFeature.ArithmeticInLiterals -> FSComp.SR.featureArithmeticInLiterals ()
| LanguageFeature.ErrorReportingOnStaticClasses -> FSComp.SR.featureErrorReportingOnStaticClasses ()
| LanguageFeature.TryWithInSeqExpression -> FSComp.SR.featureTryWithInSeqExpressions ()
| LanguageFeature.WarningWhenCopyAndUpdateRecordChangesAllFields ->
FSComp.SR.featureWarningWhenCopyAndUpdateRecordChangesAllFields ()
| LanguageFeature.StaticMembersInInterfaces -> FSComp.SR.featureStaticMembersInInterfaces ()
| LanguageFeature.NonInlineLiteralsAsPrintfFormat -> FSComp.SR.featureNonInlineLiteralsAsPrintfFormat ()
| LanguageFeature.NestedCopyAndUpdate -> FSComp.SR.featureNestedCopyAndUpdate ()
| LanguageFeature.ExtendedStringInterpolation -> FSComp.SR.featureExtendedStringInterpolation ()
| LanguageFeature.WarningWhenMultipleRecdTypeChoice -> FSComp.SR.featureWarningWhenMultipleRecdTypeChoice ()
| LanguageFeature.ImprovedImpliedArgumentNames -> FSComp.SR.featureImprovedImpliedArgumentNames ()
| LanguageFeature.DiagnosticForObjInference -> FSComp.SR.featureInformationalObjInferenceDiagnostic ()
| LanguageFeature.StaticLetInRecordsDusEmptyTypes -> FSComp.SR.featureStaticLetInRecordsDusEmptyTypes ()
| LanguageFeature.StrictIndentation -> FSComp.SR.featureStrictIndentation ()
| LanguageFeature.WarningWhenTailRecAttributeButNonTailRecUsage -> FSComp.SR.featureChkNotTailRecursive ()
| LanguageFeature.WhileBang -> FSComp.SR.featureWhileBang ()
/// Get a version string associated with the given feature.
static member GetFeatureVersionString feature =
match features.TryGetValue feature with
| true, v -> versionToString v
| _ -> invalidArg "feature" "Internal error: Unable to find feature."
override x.Equals(yobj: obj) =
match yobj with
| :? LanguageVersion as y -> x.SpecifiedVersion = y.SpecifiedVersion
| _ -> false
override x.GetHashCode() = hash x.SpecifiedVersion
static member Default = defaultLanguageVersion