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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
open System
//------------------------------------------------------------------------------------------------------------------
// 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
| NameOf
| ImplicitYield
| OpenStaticClasses
| DotlessFloat32Literal
| PackageManagement
| FromEndSlicing
| FixedIndexSlice3d4d
| AndBang
| NullableOptionalInterop
| DefaultInterfaceMemberConsumption
| WitnessPassing
| InterfacesWithMultipleGenericInstantiation
| StringInterpolation
/// LanguageVersion management
type LanguageVersion (specifiedVersionAsString) =
// 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 previewVersion = 9999m // Language version when preview specified
static let defaultVersion = languageVersion47 // Language version when default specified
static let latestVersion = defaultVersion // Language version when latest specified
static let latestMajorVersion = languageVersion47 // Language version when latestmajor specified
static let validOptions = [| "preview"; "default"; "latest"; "latestmajor" |]
static let languageVersions = set [| languageVersion46; languageVersion47 ; languageVersion50 |]
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
// F# preview
LanguageFeature.FromEndSlicing, previewVersion
LanguageFeature.OpenStaticClasses, previewVersion
LanguageFeature.PackageManagement, previewVersion
LanguageFeature.WitnessPassing, previewVersion
LanguageFeature.InterfacesWithMultipleGenericInstantiation, previewVersion
LanguageFeature.NameOf, previewVersion
LanguageFeature.StringInterpolation, previewVersion
]
let specified =
match specifiedVersionAsString with
| "?" -> 0m
| "preview" -> previewVersion
| "default" -> defaultVersion
| "latest" -> latestVersion
| "latestmajor" -> latestMajorVersion
| "4.6" -> languageVersion46
| "4.7" -> languageVersion47
| "5.0" -> languageVersion50
| _ -> 0m
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 _.IsPreviewEnabled =
specified = previewVersion
/// Does the languageVersion support this version string
member _.ContainsVersion version =
match version with
| "?" | "preview" | "default" | "latest" | "latestmajor" -> true
| _ -> languageVersions.Contains specified
/// Get a list of valid strings for help text
member _.ValidOptions = validOptions
/// Get a list of valid versions for help text
member _.ValidVersions =
[|
for v in languageVersions |> Seq.sort ->
sprintf "%M%s" v (if v = defaultVersion then " (Default)" else "")
|]
/// 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.
member _.GetFeatureString feature =
match feature with
| LanguageFeature.SingleUnderscorePattern -> FSComp.SR.featureSingleUnderscorePattern()
| LanguageFeature.WildCardInForLoop -> FSComp.SR.featureWildCardInForLoop()
| LanguageFeature.RelaxWhitespace -> FSComp.SR.featureRelaxWhitespace()
| LanguageFeature.NameOf -> FSComp.SR.featureNameOf()
| LanguageFeature.ImplicitYield -> FSComp.SR.featureImplicitYield()
| LanguageFeature.OpenStaticClasses -> FSComp.SR.featureOpenStaticClasses()
| 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.NullableOptionalInterop -> FSComp.SR.featureNullableOptionalInterop()
| LanguageFeature.DefaultInterfaceMemberConsumption -> FSComp.SR.featureDefaultInterfaceMemberConsumption()
| LanguageFeature.WitnessPassing -> FSComp.SR.featureWitnessPassing()
| LanguageFeature.InterfacesWithMultipleGenericInstantiation -> FSComp.SR.featureInterfacesWithMultipleGenericInstantiation()
| LanguageFeature.StringInterpolation -> FSComp.SR.featureStringInterpolation()
/// Get a version string associated with the given feature.
member _.GetFeatureVersionString feature =
match features.TryGetValue feature with
| true, v -> versionToString v
| _ -> invalidArg "feature" "Internal error: Unable to find feature."