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FSharp2Fable.Util.fs
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FSharp2Fable.Util.fs
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namespace rec Fable.Transforms.FSharp2Fable
open System
open System.Collections.Generic
open System.Text.RegularExpressions
open FSharp.Compiler.Symbols
open FSharp.Compiler.Text
open Fable
open Fable.Core
open Fable.AST
open Fable.Transforms
open Fable.Transforms.FSharp2Fable
open Extensions
module Extensions =
let private areParamTypesEqual genArgs (args1: Fable.Type[]) (args2: IList<IList<FSharpParameter>>) =
// Not entirely sure why, but it seems members with a single unit argument sometimes have this parameter
// and sometimes none, so just to be sure always remove single unit arguments
let args2 =
if args2.Count = 1 && args2[0].Count = 1 && Helpers.isUnit args2[0].[0].Type then [||]
else args2 |> Seq.concat |> Seq.toArray
if args1.Length = args2.Length then
let args2 = args2 |> Array.map (fun p -> TypeHelpers.makeType genArgs p.Type)
Array.forall2 (typeEquals false) args1 args2
else false
type FSharpEntity with
member entity.EnumerateMembersFunctionsAndValues(?includeHierarchy: bool): FSharpMemberOrFunctionOrValue seq =
let ownMembers = entity.TryGetMembersFunctionsAndValues()
match includeHierarchy with
| Some true ->
match TypeHelpers.tryGetBaseEntity entity with
| Some(baseDef, _) ->
Seq.append ownMembers (baseDef.EnumerateMembersFunctionsAndValues(includeHierarchy=true))
| _ -> ownMembers
| _ -> ownMembers
member entity.TryFindMember(
compiledName: string,
isInstance: bool,
?argTypes: Fable.Type[],
?genArgs,
?searchHierarchy: bool,
?requireDispatchSlot: bool
) =
let doNotRequireDispatchSlot = not(defaultArg requireDispatchSlot false)
let genArgs = defaultArg genArgs Map.empty
let argTypes =
// Remove single unit argument (see note in areParamTypesEqual above)
argTypes |> Option.map (function
| [|Fable.Unit|] -> [||]
| argTypes -> argTypes)
entity.EnumerateMembersFunctionsAndValues(?includeHierarchy=searchHierarchy)
|> Seq.tryFind (fun m2 ->
if m2.IsInstanceMember = isInstance
&& m2.CompiledName = compiledName
&& (doNotRequireDispatchSlot || m2.IsDispatchSlot) then
match argTypes with
| Some argTypes -> areParamTypesEqual genArgs argTypes m2.CurriedParameterGroups
| None -> true
else false)
type FsField(fi: FSharpField) =
let name = FsField.FSharpFieldName fi
let typ = TypeHelpers.makeType Map.empty fi.FieldType
interface Fable.Field with
member _.Name = name
member _.FieldType = typ
member _.LiteralValue = fi.LiteralValue
member _.IsStatic = fi.IsStatic
member _.IsMutable = fi.IsMutable
static member FSharpFieldName (fi: FSharpField) =
let rec countConflictingCases acc (ent: FSharpEntity) (name: string) =
match TypeHelpers.tryGetBaseEntity ent with
| None -> acc
| Some (baseClass, _) ->
let conflicts =
baseClass.FSharpFields
|> Seq.exists (fun fi -> fi.Name = name)
let acc = if conflicts then acc + 1 else acc
countConflictingCases acc baseClass name
let name = fi.Name
match fi.DeclaringEntity with
| None -> name
| Some ent when ent.IsFSharpRecord || ent.IsFSharpUnion -> name
| Some ent ->
match countConflictingCases 0 ent name with
| 0 -> name
| n -> name + "_" + (string n)
[<RequireQualifiedAccess>]
type CompiledValue =
| Integer of int
| Float of float
| Boolean of bool
type FsUnionCase(uci: FSharpUnionCase) =
/// FSharpUnionCase.CompiledName doesn't give the value of CompiledNameAttribute
/// We must check the attributes explicitly
static member CompiledName (uci: FSharpUnionCase) =
uci.Attributes
|> Helpers.tryFindAtt Atts.compiledName
|> Option.map (fun (att: FSharpAttribute) -> att.ConstructorArguments[0] |> snd |> string)
static member FullName (uci: FSharpUnionCase) =
// proper full compiled name (instead of uci.FullName)
uci.XmlDocSig
|> Naming.replacePrefix "T:Microsoft.FSharp." "FSharp."
|> Naming.replacePrefix "T:" ""
static member CompiledValue (uci: FSharpUnionCase) =
uci.Attributes
|> Helpers.tryFindAtt Atts.compiledValue
|> Option.bind (fun (att: FSharpAttribute) ->
match snd att.ConstructorArguments[0] with
| :? int as value -> Some (CompiledValue.Integer value)
| :? float as value -> Some (CompiledValue.Float value)
| :? bool as value -> Some (CompiledValue.Boolean value)
| :? Enum as value when Enum.GetUnderlyingType(value.GetType()) = typeof<int> -> Some (CompiledValue.Integer (box value :?> int))
| _ -> None
)
interface Fable.UnionCase with
member _.Name = uci.Name
member _.FullName = FsUnionCase.FullName uci
member _.CompiledName = FsUnionCase.CompiledName uci
member _.UnionCaseFields = uci.Fields |> Seq.mapToList (fun x -> upcast FsField(x))
type FsAtt(att: FSharpAttribute) =
interface Fable.Attribute with
member _.Entity = FsEnt.Ref att.AttributeType
member _.ConstructorArgs = att.ConstructorArguments |> Seq.mapToList snd
type FsGenParam(gen: FSharpGenericParameter) =
interface Fable.GenericParam with
member _.Name = TypeHelpers.genParamName gen
member _.IsMeasure = gen.IsMeasure
member _.Constraints = FsGenParam.Constraints gen
static member Constraint(c: FSharpGenericParameterConstraint) =
if c.IsCoercesToConstraint then
// It seems sometimes there are circular references so skip the constraints here
TypeHelpers.makeTypeWithConstraints false Map.empty c.CoercesToTarget
|> Fable.Constraint.CoercesTo |> Some
elif c.IsMemberConstraint then
let d = c.MemberConstraintData // TODO: Full member signature hash?
Fable.Constraint.HasMember(d.MemberName, d.MemberIsStatic) |> Some
elif c.IsSupportsNullConstraint then Some Fable.Constraint.IsNullable
elif c.IsRequiresDefaultConstructorConstraint then Some Fable.Constraint.HasDefaultConstructor
elif c.IsNonNullableValueTypeConstraint then Some Fable.Constraint.IsValueType
elif c.IsReferenceTypeConstraint then Some Fable.Constraint.IsReferenceType
elif c.IsComparisonConstraint then Some Fable.Constraint.HasComparison
elif c.IsEqualityConstraint then Some Fable.Constraint.HasEquality
elif c.IsUnmanagedConstraint then Some Fable.Constraint.IsUnmanaged
else None // TODO: Document these cases
static member Constraints(gen: FSharpGenericParameter) =
gen.Constraints |> Seq.chooseToList FsGenParam.Constraint
type FsParam(p: FSharpParameter, ?isNamed) =
let isOptional = Helpers.isOptionalParam p
let defValue =
if isOptional then
p.Attributes
|> Helpers.tryFindAtt "System.Runtime.InteropServices.DefaultParameterValueAttribute"
|> Option.bind (fun att ->
Seq.tryHead att.ConstructorArguments
|> Option.map (fun (_, v) -> makeConstFromObj v))
else None
interface Fable.Parameter with
member _.Name = p.Name
member _.Type = TypeHelpers.makeType Map.empty p.Type
member _.Attributes = p.Attributes |> Seq.map (fun x -> FsAtt(x) :> Fable.Attribute)
member _.IsIn = p.IsInArg
member _.IsOut = p.IsOutArg
member _.IsNamed = defaultArg isNamed false
member _.IsOptional = isOptional
member _.DefaultValue = defValue
type FsDeclaredType(ent: FSharpEntity, genArgs: IList<FSharpType>) =
interface Fable.DeclaredType with
member _.Entity = FsEnt.Ref ent
member _.GenericArgs = genArgs |> Seq.mapToList (TypeHelpers.makeType Map.empty)
type FsAbstractSignature(s: FSharpAbstractSignature) =
interface Fable.AbstractSignature with
member _.Name = s.Name
member _.DeclaringType = TypeHelpers.makeType Map.empty s.DeclaringType
type FsMemberFunctionOrValue(m: FSharpMemberOrFunctionOrValue) =
static member DisplayName(m: FSharpMemberOrFunctionOrValue) =
Naming.removeGetSetPrefix m.DisplayNameCore
// We don't consider indexer properties as getters/setters so they're always compiled as methods
static member IsGetter(m: FSharpMemberOrFunctionOrValue) =
m.IsPropertyGetterMethod && Util.countNonCurriedParams m = 0
static member IsSetter(m: FSharpMemberOrFunctionOrValue) =
m.IsPropertySetterMethod && Util.countNonCurriedParams m = 1
interface Fable.MemberFunctionOrValue with
member _.Attributes =
m.Attributes |> Seq.map (fun x -> FsAtt(x) :> Fable.Attribute)
member _.CurriedParameterGroups =
let mutable i = -1
let namedParamsIndex =
m.Attributes
|> Helpers.tryFindAtt Atts.paramObject
|> Option.map (fun (att: FSharpAttribute) ->
match Seq.tryItem 0 att.ConstructorArguments with
| Some(_, (:?int as index)) -> index
| _ -> 0)
m.CurriedParameterGroups
|> Seq.mapToList (Seq.mapToList (fun p ->
i <- i + 1
let isNamed =
match namedParamsIndex with
| Some namedParamsIndex -> i >= namedParamsIndex
| None -> false
FsParam(p, isNamed=isNamed) :> Fable.Parameter))
member _.HasSpread = Helpers.hasParamArray m
member _.IsInline = Helpers.isInline m
member _.IsPublic = Helpers.isNotPrivate m
member _.IsPrivate = m.Accessibility.IsPrivate
member _.IsInternal = m.Accessibility.IsInternal
// Using memb.IsValue doesn't work for function values
// (e.g. `let ADD = adder()` when adder returns a function)
member _.IsValue = Helpers.isModuleValueForDeclarations m
member _.IsDispatchSlot = m.IsDispatchSlot
member _.IsConstructor = m.IsConstructor
member _.IsInstance = m.IsInstanceMember
member _.IsExtension = m.IsExtensionMember
member _.IsMutable = m.IsMutable
member _.IsProperty = m.IsProperty
member _.IsGetter = FsMemberFunctionOrValue.IsGetter(m)
member _.IsSetter = FsMemberFunctionOrValue.IsSetter(m)
member _.IsOverrideOrExplicitInterfaceImplementation = m.IsOverrideOrExplicitInterfaceImplementation
member _.DisplayName = FsMemberFunctionOrValue.DisplayName m
member _.CompiledName = m.CompiledName
member _.FullName = m.FullName
member _.GenericParameters = m.GenericParameters |> Seq.mapToList (fun p -> FsGenParam(p))
member _.ReturnParameter = FsParam(m.ReturnParameter) :> Fable.Parameter
member _.ImplementedAbstractSignatures = m.ImplementedAbstractSignatures |> Seq.map (fun s -> FsAbstractSignature(s))
member _.ApparentEnclosingEntity = FsEnt.Ref m.ApparentEnclosingEntity |> Some
member _.DeclaringEntity = m.DeclaringEntity |> Option.map FsEnt.Ref
type FsEnt(maybeAbbrevEnt: FSharpEntity) =
let ent = Helpers.nonAbbreviatedDefinition maybeAbbrevEnt
static let tryArrayFullName (ent: FSharpEntity) =
if ent.IsArrayType then
let rank =
match ent.ArrayRank with
| rank when rank > 1 -> "`" + string rank
| _ -> ""
Some("System.Array" + rank)
else None
member _.FSharpEntity = ent
static member SourcePath (ent: FSharpEntity) =
let ent = Helpers.nonAbbreviatedDefinition ent
ent.DeclarationLocation.FileName
|> Path.normalizePathAndEnsureFsExtension
static member FullName (ent: FSharpEntity): string =
let ent = Helpers.nonAbbreviatedDefinition ent
match tryArrayFullName ent with
| Some fullName -> fullName
| None when ent.IsNamespace || ent.IsByRef ->
match ent.Namespace with
| Some ns -> ns + "." + ent.CompiledName
| None -> ent.CompiledName
#if !FABLE_COMPILER
| None when ent.IsProvided ->
ent.LogicalName
#endif
| None ->
match ent.TryFullName with
| Some n -> n
| None -> ent.LogicalName
static member Ref (ent: FSharpEntity): Fable.EntityRef =
let path =
match ent.Assembly.FileName with
| Some asmPath ->
let dllName = Path.GetFileName(asmPath)
let dllName = dllName.Substring(0, dllName.Length - 4) // Remove .dll extension
match dllName with
// When compiling with netcoreapp target, netstandard only contains redirects
// We can find the actual assembly name from the entity qualified name
| "netstandard" ->
ent.QualifiedName.Split(',').[1].Trim() |> Fable.CoreAssemblyName
| Naming.fablePrecompile ->
let sourcePath = FsEnt.SourcePath ent
Fable.PrecompiledLib(sourcePath, Path.normalizePath asmPath)
| dllName when Compiler.CoreAssemblyNames.Contains(dllName) ->
Fable.CoreAssemblyName dllName
| _ ->
Path.normalizePath asmPath |> Fable.AssemblyPath
| None ->
FsEnt.SourcePath ent |> Fable.SourcePath
{ FullName = FsEnt.FullName ent
Path = path }
interface Fable.Entity with
member _.Ref = FsEnt.Ref ent
member _.DisplayName = ent.DisplayName
member _.CompiledName = ent.CompiledName
member _.FullName = FsEnt.FullName ent
member _.DeclaringEntity = ent.DeclaringEntity |> Option.map FsEnt.Ref
member _.BaseType =
match TypeHelpers.tryGetBaseEntity ent with
| Some(baseEntity, baseGenArgs) -> Some(upcast FsDeclaredType(baseEntity, baseGenArgs))
| _ -> None
member _.Attributes =
ent.Attributes |> Seq.map (fun x -> FsAtt(x) :> Fable.Attribute)
member _.MembersFunctionsAndValues =
ent.EnumerateMembersFunctionsAndValues()
|> Seq.map (fun m -> FsMemberFunctionOrValue(m))
member _.TryFindMember(info: Fable.MemberRefInfo) =
ent.TryFindMember(info.CompiledName, isInstance=info.IsInstance, ?argTypes=(Option.map List.toArray info.NonCurriedArgTypes))
|> Option.map (fun m -> FsMemberFunctionOrValue(m))
member _.AllInterfaces =
ent.AllInterfaces |> Seq.choose (fun ifc ->
if ifc.HasTypeDefinition then
Some(upcast FsDeclaredType(ifc.TypeDefinition, ifc.GenericArguments))
else None)
member _.DeclaredInterfaces =
ent.DeclaredInterfaces |> Seq.choose (fun ifc ->
if ifc.HasTypeDefinition then
Some(upcast FsDeclaredType(ifc.TypeDefinition, ifc.GenericArguments))
else None)
member _.GenericParameters =
ent.GenericParameters |> Seq.mapToList (fun p -> FsGenParam(p))
member _.FSharpFields =
ent.FSharpFields |> Seq.mapToList (fun x -> FsField(x) :> Fable.Field)
member _.UnionCases =
ent.UnionCases |> Seq.mapToList (fun x -> FsUnionCase(x) :> Fable.UnionCase)
member _.IsPublic = not ent.Accessibility.IsPrivate
member _.IsPrivate = ent.Accessibility.IsPrivate
member _.IsInternal = ent.Accessibility.IsInternal
member _.IsAbstractClass = ent.IsAbstractClass
member _.IsNamespace = ent.IsNamespace
member _.IsFSharpModule = ent.IsFSharpModule
member _.IsFSharpUnion = ent.IsFSharpUnion
member _.IsFSharpRecord = ent.IsFSharpRecord
member _.IsFSharpAbbreviation = maybeAbbrevEnt.IsFSharpAbbreviation
member _.IsFSharpExceptionDeclaration = ent.IsFSharpExceptionDeclaration
member _.IsValueType = ent.IsValueType
member _.IsInterface = ent.IsInterface
member _.IsMeasure = ent.IsMeasure
member _.IsByRef = ent.IsByRef
member _.IsEnum = ent.IsEnum
type Scope = (FSharpMemberOrFunctionOrValue option * Fable.Ident * Fable.Expr option) list
type Context =
{ Scope: Scope
ScopeInlineValues: (FSharpMemberOrFunctionOrValue * FSharpExpr) list
UsedNamesInRootScope: Set<string>
UsedNamesInDeclarationScope: HashSet<string>
CapturedBindings: HashSet<string>
GenericArgs: Map<string, Fable.Type>
EnclosingMember: FSharpMemberOrFunctionOrValue option
PrecompilingInlineFunction: FSharpMemberOrFunctionOrValue option
CaughtException: Fable.Ident option
BoundConstructorThis: Fable.Ident option
BoundMemberThis: Fable.Ident option
InlinePath: Log.InlinePath list
CaptureBaseConsCall: (FSharpEntity * (Fable.Expr -> unit)) option
Witnesses: Fable.Witness list
}
static member Create(?usedRootNames) =
{ Scope = []
ScopeInlineValues = []
UsedNamesInRootScope = defaultArg usedRootNames Set.empty
UsedNamesInDeclarationScope = Unchecked.defaultof<_>
CapturedBindings = Unchecked.defaultof<_>
GenericArgs = Map.empty
EnclosingMember = None
PrecompilingInlineFunction = None
CaughtException = None
BoundConstructorThis = None
BoundMemberThis = None
InlinePath = []
CaptureBaseConsCall = None
Witnesses = []
}
type IFableCompiler =
inherit Compiler
abstract Transform: Context * FSharpExpr -> Fable.Expr
abstract ResolveInlineExpr: Context * InlineExpr * Fable.Expr list
-> (Fable.Ident * Fable.Expr) list * Fable.Expr
abstract TryReplace: Context * SourceLocation option * Fable.Type *
info: Fable.ReplaceCallInfo * thisArg: Fable.Expr option * args: Fable.Expr list -> Fable.Expr option
abstract WarnOnlyOnce: string * ?range: SourceLocation -> unit
module Helpers =
let rec nonAbbreviatedDefinition (ent: FSharpEntity): FSharpEntity =
if ent.IsFSharpAbbreviation then
let t = ent.AbbreviatedType
if t.HasTypeDefinition && t.TypeDefinition <> ent
then nonAbbreviatedDefinition t.TypeDefinition
else ent
else ent
let rec nonAbbreviatedType (t: FSharpType): FSharpType =
let isSameType (t1: FSharpType) (t2: FSharpType) =
t1.HasTypeDefinition && t2.HasTypeDefinition && (t1.TypeDefinition = t2.TypeDefinition)
if t.IsAbbreviation && not (isSameType t t.AbbreviatedType) then
nonAbbreviatedType t.AbbreviatedType
elif t.HasTypeDefinition then
let abbr = t.AbbreviatedType
// .IsAbbreviation doesn't eval to true for generic numbers
// See https://github.com/Microsoft/visualfsharp/issues/5992
if t.GenericArguments.Count = abbr.GenericArguments.Count then t
else abbr
else t
let getGenericArguments (t: FSharpType) =
// Accessing .GenericArguments for a generic parameter will fail
if t.IsGenericParameter
then [||] :> IList<_>
else (nonAbbreviatedType t).GenericArguments
type TrimRootModule =
| TrimRootModule of Compiler
| NoTrimRootModule
let private getEntityMangledName trimRootModule (ent: Fable.EntityRef) =
let fullName = ent.FullName
match trimRootModule, ent.Path with
| TrimRootModule com, (Fable.SourcePath sourcePath | Fable.PrecompiledLib(sourcePath, _)) ->
let rootMod = com.GetRootModule(sourcePath)
if fullName.StartsWith(rootMod) then
fullName.Substring(rootMod.Length).TrimStart('.')
else fullName
// Ignore entities for which we don't have implementation file data
| TrimRootModule _, (Fable.AssemblyPath _ | Fable.CoreAssemblyName _)
| NoTrimRootModule, _ -> fullName
let cleanNameAsJsIdentifier (name: string) =
if name = ".ctor" then "$ctor"
else name.Replace('.','_').Replace('`','$')
let cleanNameAsRustIdentifier (name: string) =
// name |> Naming.sanitizeIdentForbiddenChars
let name = Regex.Replace(name, @"[\s`'"".]", "_")
let name = Regex.Replace(name, @"[^\w]",
fun c -> String.Format(@"_{0:x4}", int c.Value[0]))
name
let memberNameAsRustIdentifier (name: string) part =
let f = cleanNameAsRustIdentifier
let join sep s o = (f s) + (if o = "" then "" else sep + o)
match part with
| Naming.InstanceMemberPart(s, o) -> join "_" s o, Naming.NoMemberPart
| Naming.StaticMemberPart(s, o) -> join "__" s o, Naming.NoMemberPart
| Naming.NoMemberPart -> f name, part.Replace(f)
let getEntityDeclarationName (com: Compiler) (entRef: Fable.EntityRef) =
let entityName = getEntityMangledName (TrimRootModule com) entRef
let name, part = (entityName |> cleanNameAsJsIdentifier, Naming.NoMemberPart)
let sanitizedName =
match com.Options.Language with
| Python -> Fable.Py.Naming.sanitizeIdent Fable.Py.Naming.pyBuiltins.Contains name part
| Rust -> entityName |> cleanNameAsRustIdentifier
| _ -> Naming.sanitizeIdent (fun _ -> false) name part
sanitizedName
let getOverloadSuffixFrom (ent: FSharpEntity) (memb: FSharpMemberOrFunctionOrValue) =
match ent.CompiledName with
// HACK for compiling FSharpMap/FSharpSet in fable-library
| "FSharpMap" | "FSharpSet" -> ""
| _ ->
let entGenParams = ent.GenericParameters |> Seq.mapToList TypeHelpers.genParamName
memb.CurriedParameterGroups
|> Seq.mapToList (Seq.mapToList (fun p -> TypeHelpers.makeType Map.empty p.Type))
|> OverloadSuffix.getHash entGenParams
let private getMemberMangledName trimRootModule (memb: FSharpMemberOrFunctionOrValue) =
if memb.IsExtensionMember then
let overloadSuffix =
memb.CurriedParameterGroups
|> Seq.mapToList (Seq.mapToList (fun p -> TypeHelpers.makeType Map.empty p.Type))
|> OverloadSuffix.getExtensionHash
let entName = FsEnt.Ref memb.ApparentEnclosingEntity |> getEntityMangledName NoTrimRootModule
entName, Naming.InstanceMemberPart(memb.CompiledName, overloadSuffix)
else
match memb.DeclaringEntity with
| Some ent ->
let entRef = FsEnt.Ref ent
let entName = getEntityMangledName trimRootModule entRef
if ent.IsFSharpModule then
match trimRootModule, entName with
| TrimRootModule com, _ when com.Options.Language = Rust ->
memb.CompiledName, Naming.NoMemberPart // module prefix for Rust
| _, "" ->
memb.CompiledName, Naming.NoMemberPart
| _, moduleName ->
moduleName, Naming.StaticMemberPart(memb.CompiledName, "")
else
let overloadSuffix = getOverloadSuffixFrom ent memb
if memb.IsInstanceMember
then entName, Naming.InstanceMemberPart(memb.CompiledName, overloadSuffix)
else entName, Naming.StaticMemberPart(memb.CompiledName, overloadSuffix)
| None -> memb.CompiledName, Naming.NoMemberPart
/// Returns the sanitized name for the member declaration and whether it has an overload suffix
let getMemberDeclarationName (com: Compiler) (memb: FSharpMemberOrFunctionOrValue) =
let name, part = getMemberMangledName (TrimRootModule com) memb
let name, part =
match com.Options.Language with
| Rust -> memberNameAsRustIdentifier name part
| _ -> cleanNameAsJsIdentifier name, part.Replace(cleanNameAsJsIdentifier)
let sanitizedName =
match com.Options.Language with
| Python ->
let name =
// Don't snake_case if member has compiled name attribute
match memb.Attributes |> Helpers.tryFindAtt Atts.compiledName with
| Some _ -> name
| _ -> Fable.Py.Naming.toSnakeCase name
Fable.Py.Naming.sanitizeIdent Fable.Py.Naming.pyBuiltins.Contains name part
| Rust -> Naming.buildNameWithoutSanitation name part
| _ -> Naming.sanitizeIdent (fun _ -> false) name part
let hasOverloadSuffix = not (String.IsNullOrEmpty(part.OverloadSuffix))
sanitizedName, hasOverloadSuffix
/// Used to identify members uniquely in the inline expressions dictionary
let getMemberUniqueName (memb: FSharpMemberOrFunctionOrValue): string =
getMemberMangledName NoTrimRootModule memb
||> Naming.buildNameWithoutSanitation
let getMemberDisplayName (memb: FSharpMemberOrFunctionOrValue) =
FsMemberFunctionOrValue.DisplayName memb
let isUsedName (ctx: Context) name =
ctx.UsedNamesInRootScope.Contains name || ctx.UsedNamesInDeclarationScope.Contains name
let getIdentUniqueName (ctx: Context) name =
let name =
(name, Naming.NoMemberPart)
||> Naming.sanitizeIdent (isUsedName ctx)
ctx.UsedNamesInDeclarationScope.Add(name) |> ignore
name
let isUnit (typ: FSharpType) =
let typ = nonAbbreviatedType typ
if typ.HasTypeDefinition then
typ.TypeDefinition.TryFullName = Some Types.unit
else false
let isByRefValue (value: FSharpMemberOrFunctionOrValue) =
// Value type "this" is passed as inref, so it has to be excluded
// (Note: the non-abbreviated type of inref and outref is byref)
let typ = value.FullType
value.IsValue && not (value.IsMemberThisValue)
&& typ.HasTypeDefinition
&& typ.TypeDefinition.IsByRef
// && (typ.TypeDefinition.DisplayName = "byref" ||
// typ.TypeDefinition.DisplayName = "inref" ||
// typ.TypeDefinition.DisplayName = "outref")
let tryFindAtt fullName (atts: FSharpAttribute seq) =
atts |> Seq.tryPick (fun att ->
match (nonAbbreviatedDefinition att.AttributeType).TryFullName with
| Some fullName' ->
if fullName = fullName' then Some att else None
| None -> None)
let hasAttribute attFullName (attributes: FSharpAttribute seq) =
attributes |> Seq.exists (fun att ->
match (nonAbbreviatedDefinition att.AttributeType).TryFullName with
| Some attFullName2 -> attFullName = attFullName2
| None -> false)
let tryPickAttribute attFullNames (attributes: FSharpAttribute seq) =
let attFullNames = Map attFullNames
attributes |> Seq.tryPick (fun att ->
match (nonAbbreviatedDefinition att.AttributeType).TryFullName with
| Some fullName -> Map.tryFind fullName attFullNames
| None -> None)
let tryAttributeConsArg (att: FSharpAttribute) index (defValue: 'T) (f: obj -> 'T option) =
let consArgs = att.ConstructorArguments
if consArgs.Count <= index then defValue
else
consArgs[index] |> snd |> f
|> Option.defaultValue defValue
let tryBoolean: obj -> bool option = function (:? bool as x) -> Some x | _ -> None
let tryString: obj -> string option = function (:? string as x) -> Some x | _ -> None
let tryDefinition (typ: FSharpType) =
let typ = nonAbbreviatedType typ
if typ.HasTypeDefinition then
let tdef = typ.TypeDefinition
Some(tdef, tdef.TryFullName)
else None
let getFsTypeFullName (typ: FSharpType) =
match tryDefinition typ with
| Some(_, Some fullName) -> fullName
| _ -> Naming.unknown
let isInline (memb: FSharpMemberOrFunctionOrValue) =
match memb.InlineAnnotation with
| FSharpInlineAnnotation.NeverInline
| FSharpInlineAnnotation.OptionalInline -> false
| FSharpInlineAnnotation.AlwaysInline
| FSharpInlineAnnotation.AggressiveInline -> true
let isNotPrivate (memb: FSharpMemberOrFunctionOrValue) =
if memb.IsCompilerGenerated then false
else not memb.Accessibility.IsPrivate
let isPublic (memb: FSharpMemberOrFunctionOrValue) =
if memb.IsCompilerGenerated then false
else memb.Accessibility.IsPublic
let makeRange (r: Range) =
{ start = { line = r.StartLine; column = r.StartColumn }
``end``= { line = r.EndLine; column = r.EndColumn }
identifierName = None }
let makeRangeFrom (fsExpr: FSharpExpr) =
Some (makeRange fsExpr.Range)
let unionCaseTag (com: IFableCompiler) (ent: FSharpEntity) (unionCase: FSharpUnionCase) =
try
// If the order of cases changes in the declaration, the tag has to change too.
// Mark all files using the case tag as watch dependencies.
com.AddWatchDependency(FsEnt.SourcePath ent)
ent.UnionCases |> Seq.findIndex (fun uci -> unionCase.Name = uci.Name)
with _ ->
failwith $"Cannot find case %s{unionCase.Name} in %s{FsEnt.FullName ent}"
/// Apply case rules to case name if there's no explicit compiled name
let transformStringEnum (rule: CaseRules) (unionCase: FSharpUnionCase) =
match FsUnionCase.CompiledName unionCase with
| Some name -> name
| None -> Naming.applyCaseRule rule unionCase.Name
|> makeStrConst
// let isModuleMember (memb: FSharpMemberOrFunctionOrValue) =
// match memb.DeclaringEntity with
// | Some ent -> ent.IsFSharpModule
// | None -> true // Compiler-generated members
/// Using memb.IsValue doesn't work for function values
/// (e.g. `let ADD = adder()` when adder returns a function)
let isModuleValueForDeclarations (memb: FSharpMemberOrFunctionOrValue) =
memb.CurriedParameterGroups.Count = 0 && memb.GenericParameters.Count = 0
// Mutable public values must be called as functions in JS (see #986)
let isModuleValueCompiledAsFunction (com: Compiler) (memb: FSharpMemberOrFunctionOrValue) =
match com.Options.Language with
| Python | JavaScript | TypeScript -> memb.IsMutable && isNotPrivate memb
| Rust | Php | Dart -> false
let isModuleValueForCalls com (declaringEntity: FSharpEntity) (memb: FSharpMemberOrFunctionOrValue) =
declaringEntity.IsFSharpModule
&& isModuleValueForDeclarations memb
&& not(isModuleValueCompiledAsFunction com memb)
let rec getAllInterfaceMembers (ent: FSharpEntity) =
seq {
yield! ent.MembersFunctionsAndValues
for parent in ent.DeclaredInterfaces do
match tryDefinition parent with
| Some(e, _) -> yield! getAllInterfaceMembers e
| None -> ()
}
/// Test if the name corresponds to this interface or anyone in its hierarchy
let rec testInterfaceHierarchy interfaceFullname interfaceType =
match tryDefinition interfaceType with
| Some(e, Some fullname2) ->
if interfaceFullname = fullname2
then true
else e.DeclaredInterfaces
|> Seq.exists (testInterfaceHierarchy interfaceFullname)
| _ -> false
let isOptionalParam (p: FSharpParameter) =
p.IsOptionalArg || (
// Dart resolves [<Optional>] args also on the declaration site
Compiler.Language = Dart
&& hasAttribute "System.Runtime.InteropServices.OptionalAttribute" p.Attributes
)
let hasParamArray (memb: FSharpMemberOrFunctionOrValue) =
let hasParamArray (memb: FSharpMemberOrFunctionOrValue) =
if memb.CurriedParameterGroups.Count <> 1 then false else
let args = memb.CurriedParameterGroups[0]
args.Count > 0 && args[args.Count - 1].IsParamArrayArg
let hasParamSeq (memb: FSharpMemberOrFunctionOrValue) =
Seq.tryLast memb.CurriedParameterGroups
|> Option.bind Seq.tryLast
|> Option.map (fun lastParam -> hasAttribute Atts.paramList lastParam.Attributes)
|> Option.defaultValue false
hasParamArray memb || hasParamSeq memb
type UnionPattern =
| OptionUnion of FSharpType * isStruct: bool
| ListUnion of FSharpType
| ErasedUnion of FSharpEntity * IList<FSharpType> * CaseRules * tag: bool
| ErasedUnionCase
| TypeScriptTaggedUnion of FSharpEntity * IList<FSharpType> * tagName:string * CaseRules
| StringEnum of FSharpEntity * CaseRules
| DiscriminatedUnion of FSharpEntity * IList<FSharpType>
let getUnionPattern (typ: FSharpType) (unionCase: FSharpUnionCase) : UnionPattern =
let typ = nonAbbreviatedType typ
unionCase.Attributes |> Seq.tryPick (fun att ->
match att.AttributeType.TryFullName with
| Some Atts.erase -> Some ErasedUnionCase
| _ -> None)
|> Option.defaultWith (fun () ->
match tryDefinition typ with
| None -> failwith "Union without definition"
| Some(tdef, fullName) ->
match defaultArg fullName tdef.CompiledName with
| Types.valueOption -> OptionUnion (typ.GenericArguments[0], true)
| Types.option -> OptionUnion (typ.GenericArguments[0], false)
| Types.list -> ListUnion typ.GenericArguments[0]
| _ ->
tdef.Attributes |> Seq.tryPick (fun att ->
match att.AttributeType.TryFullName with
| Some Atts.erase ->
let caseRule, tag =
match Seq.tryHead att.ConstructorArguments with
| Some(_, (:? int as rule)) -> enum<CaseRules>(rule), false
| Some(_, (:? bool as tag)) ->
if tag then CaseRules.None, true else CaseRules.LowerFirst, false
| _ -> CaseRules.LowerFirst, false
Some (ErasedUnion(tdef, typ.GenericArguments, caseRule, tag))
| Some Atts.stringEnum ->
let caseRule =
match Seq.tryHead att.ConstructorArguments with
| Some(_, (:? int as rule)) -> enum<CaseRules>(rule)
| _ -> CaseRules.LowerFirst
Some (StringEnum(tdef, caseRule))
| Some Atts.tsTaggedUnion ->
match Seq.tryItem 0 att.ConstructorArguments, Seq.tryItem 1 att.ConstructorArguments with
| Some (_, (:? string as name)), None ->
Some (TypeScriptTaggedUnion(tdef, typ.GenericArguments, name, CaseRules.LowerFirst))
| Some (_, (:? string as name)), Some (_, (:? int as rule)) ->
Some (TypeScriptTaggedUnion(tdef, typ.GenericArguments, name, enum<CaseRules>(rule)))
| _ -> failwith "Invalid TypeScriptTaggedUnion attribute"
| _ -> None)
|> Option.defaultValue (DiscriminatedUnion(tdef, typ.GenericArguments))
)
let tryGetFieldTag (memb: FSharpMemberOrFunctionOrValue) =
if Compiler.Language = Dart && hasAttribute Atts.dartIsConst memb.Attributes
then Some "const"
else None
module Patterns =
open FSharpExprPatterns
open Helpers
let inline (|Rev|) x = List.rev x
let inline (|AsArray|) x = Array.ofSeq x
let inline (|LazyValue|) (x: Lazy<'T>) = x.Value
let inline (|Transform|) (com: IFableCompiler) ctx e = com.Transform(ctx, e)
let inline (|FieldName|) (fi: FSharpField) = fi.Name
let (|CommonNamespace|_|) = function
| (FSharpImplementationFileDeclaration.Entity(ent, subDecls))::restDecls
when ent.IsNamespace ->
let commonName = ent.CompiledName
(Some subDecls, restDecls) ||> List.fold (fun acc decl ->
match acc, decl with
| (Some subDecls), (FSharpImplementationFileDeclaration.Entity(ent, subDecls2)) ->
if ent.CompiledName = commonName
then Some(subDecls@subDecls2)
else None
| _ -> None)
|> Option.map (fun subDecls -> ent, subDecls)
| _ -> None
let inline (|NonAbbreviatedType|) (t: FSharpType) =
nonAbbreviatedType t
let (|IgnoreAddressOf|) (expr: FSharpExpr) =
match expr with
| AddressOf value -> value
| _ -> expr
let (|TypeDefinition|_|) (NonAbbreviatedType t) =
if t.HasTypeDefinition then Some t.TypeDefinition else None
/// DOES NOT check if the type is abbreviated, mainly intended to identify Fable.Core.Applicable
let (|FSharpExprTypeFullName|_|) (e: FSharpExpr) =
let t = e.Type
if t.HasTypeDefinition then t.TypeDefinition.TryFullName else None
let (|MemberFullName|) (memb: FSharpMemberOrFunctionOrValue) =
memb.FullName
let (|RefType|_|) = function
| TypeDefinition tdef as t when tdef.TryFullName = Some Types.refCell -> Some t
| _ -> None
/// Detects AST pattern of "raise MatchFailureException()"
let (|RaisingMatchFailureExpr|_|) (expr: FSharpExpr) =
match expr with
| Call(None, methodInfo, [ ], [_unitType], [value]) ->
match methodInfo.FullName with
| "Microsoft.FSharp.Core.Operators.raise" ->
match value with
| NewRecord(recordType, [Const (value, _valueT) ; _rangeFrom; _rangeTo]) ->
match recordType.TypeDefinition.TryFullName with
| Some Types.matchFail -> Some (value.ToString())
| _ -> None
| _ -> None
| _ -> None
| _ -> None
let (|NestedLambda|_|) x =
let rec nestedLambda args = function
| Lambda(arg, body) -> nestedLambda (arg::args) body
| body -> List.rev args, body
match x with
| Lambda(arg, body) -> nestedLambda [arg] body |> Some
| _ -> None
let (|ForOf|_|) = function
| Let((_, value, _), // Coercion to seq
Let((_, Call(None, meth, _, [], []), _),
TryFinally(
WhileLoop(_,
Let((ident, _, _), body), _), _, _, _)))
| Let((_, Call(Some value, meth, _, [], []), _),
TryFinally(
WhileLoop(_,
Let((ident, _, _), body), _), _, _, _))
// Using only the compiled name is riskier but with the fullname we miss some cases
// TODO: Check the return type of meth is or implements IEnumerator
when meth.CompiledName = "GetEnumerator" ->
// when meth.FullName = "System.Collections.Generic.IEnumerable.GetEnumerator" ->
Some(ident, value, body)
// optimized "for x in list"
| Let((_, UnionCaseGet(value, typ, unionCase, field), _),
WhileLoop(_, Let((ident, _, _), body), _))
when (getFsTypeFullName typ) = Types.list
&& unionCase.Name = "op_ColonColon" && field.Name = "Tail" ->
Some (ident, value, body)
// optimized "for _x in list"
| Let((ident, UnionCaseGet(value, typ, unionCase, field), _),
WhileLoop(_, body, _))
when (getFsTypeFullName typ) = Types.list
&& unionCase.Name = "op_ColonColon" && field.Name = "Tail" ->
Some (ident, value, body)
| _ -> None
/// This matches the boilerplate generated for TryGetValue/TryParse/DivRem (see #154, or #1744)
/// where the F# compiler automatically passes a byref arg and returns it as a tuple
let (|ByrefArgToTuple|_|) = function
| Let((outArg1, (DefaultValue _ as def), _),
NewTuple(_, [Call(callee, memb, ownerGenArgs, membGenArgs, callArgs); Value outArg3]))
when List.isMultiple callArgs && outArg1.IsCompilerGenerated && outArg1 = outArg3 ->
match List.splitLast callArgs with
| callArgs, AddressOf(Value outArg2) when outArg1 = outArg2 ->
Some (callee, memb, ownerGenArgs, membGenArgs, callArgs@[def])
| _ -> None
| _ -> None
/// This matches the boilerplate generated for TryGetValue/TryParse/DivRem (--optimize+)
let (|ByrefArgToTupleOptimizedIf|_|) = function
| Let((outArg1, (DefaultValue _ as def), _), IfThenElse
(Call(callee, memb, ownerGenArgs, membGenArgs, callArgs), thenExpr, elseExpr))
when List.isMultiple callArgs && outArg1.IsCompilerGenerated ->
match List.splitLast callArgs with
| callArgs, AddressOf(Value outArg2) when outArg1 = outArg2 ->
Some (outArg1, callee, memb, ownerGenArgs, membGenArgs, callArgs@[def], thenExpr, elseExpr)
| _ -> None
| _ -> None
/// This matches another boilerplate generated for TryGetValue/TryParse/DivRem (--optimize+)
let (|ByrefArgToTupleOptimizedTree|_|) = function
| Let((outArg1, (DefaultValue _ as def), _), DecisionTree(IfThenElse
(Call(callee, memb, ownerGenArgs, membGenArgs, callArgs), thenExpr, elseExpr), targetsExpr))
when List.isMultiple callArgs && outArg1.IsCompilerGenerated ->
match List.splitLast callArgs with
| callArgs, AddressOf(Value outArg2) when outArg1 = outArg2 ->
Some (outArg1, callee, memb, ownerGenArgs, membGenArgs, callArgs@[def], thenExpr, elseExpr, targetsExpr)
| _ -> None
| _ -> None
/// This matches another boilerplate generated for TryGetValue/TryParse/DivRem (--crossoptimize-)
let (|ByrefArgToTupleOptimizedLet|_|) = function
| Let((outArg1, (DefaultValue _ as def), _),
Let((arg_0, Call(callee, memb, ownerGenArgs, membGenArgs, callArgs), _), restExpr))
when List.isMultiple callArgs && outArg1.IsCompilerGenerated ->
match List.splitLast callArgs with
| callArgs, AddressOf(Value outArg2) when outArg1 = outArg2 ->
Some (arg_0, outArg1, callee, memb, ownerGenArgs, membGenArgs, callArgs@[def], restExpr)
| _ -> None
| _ -> None
/// This matches the boilerplate generated to wrap .NET events from F#
let (|CreateEvent|_|) = function
| Call(None,createEvent,_,_,
[Lambda(_eventDelegate, Call(Some callee, addEvent,[],[],[Value _eventDelegate']));
Lambda(_eventDelegate2, Call(Some _callee2, _removeEvent,[],[],[Value _eventDelegate2']));
Lambda(_callback, NewDelegate(_, Lambda(_delegateArg0, Lambda(_delegateArg1, Application(Value _callback',[],[Value _delegateArg0'; Value _delegateArg1'])))))])
when createEvent.FullName = Types.createEvent ->
let eventName = addEvent.CompiledName.Replace("add_","")
match addEvent.DeclaringEntity with
| Some klass ->
klass.MembersFunctionsAndValues
|> Seq.tryFind (fun m -> m.LogicalName = eventName)
|> function
| Some memb -> Some (callee, memb)
| _ -> None
| _ -> None
| _ -> None
let (|ConstructorCall|_|) = function
| NewObject(baseCall, genArgs, baseArgs) -> Some(baseCall, genArgs, baseArgs)
| Call(None, baseCall, genArgs1, genArgs2, baseArgs) when baseCall.IsConstructor ->
Some(baseCall, genArgs1 @ genArgs2, baseArgs)
| _ -> None
let (|OptimizedOperator|_|) (com: Compiler) fsExpr =
if com.Options.OptimizeFSharpAst then
match fsExpr with
// work-around for optimized string operator (Operators.string)
| Let((var, Call(None, memb, _, membArgTypes, membArgs), _),
DecisionTree(IfThenElse(_, _, IfThenElse
(TypeTest(tt, Value vv), _, _)), _))
when var.FullName = "matchValue" && memb.FullName = "Microsoft.FSharp.Core.Operators.box"
&& vv.FullName = "matchValue" && (getFsTypeFullName tt) = "System.IFormattable" ->
Some(memb, None, "toString", membArgTypes, membArgs)
// work-around for optimized hash operator (Operators.hash)
| Call(Some expr, memb, _, [], [Call(None, comp, [], [], [])])
when memb.FullName.EndsWith(".GetHashCode") &&
comp.FullName = "Microsoft.FSharp.Core.LanguagePrimitives.GenericEqualityERComparer" ->
Some(memb, Some comp, "GenericHash", [expr.Type], [expr])
// work-around for optimized equality operator (Operators.(=))
| Call(Some e1, memb, _, [], [Coerce (t2, e2); Call(None, comp, [], [], [])])
when memb.FullName.EndsWith(".Equals") && t2.HasTypeDefinition && t2.TypeDefinition.CompiledName = "obj" &&
comp.FullName = "Microsoft.FSharp.Core.LanguagePrimitives.GenericEqualityComparer" ->
Some(memb, Some comp, "GenericEquality", [e1.Type; e2.Type], [e1; e2])
| _ -> None
else None
let inline (|FableType|) _com (ctx: Context) t = TypeHelpers.makeType ctx.GenericArgs t
module TypeHelpers =
open Helpers
open Patterns
let genParamName (genParam: FSharpGenericParameter) =
// Sometimes the names of user-declared and compiler-generated clash, see #1900 and https://github.com/dotnet/fsharp/issues/13062
let name = if genParam.IsCompilerGenerated then "$" + genParam.Name.Replace("?", "$") else genParam.Name
match Compiler.Language with
// In Dart we cannot have the same generic name as a variable or argument, so we add $ to reduce the probabilities of conflict
// Other solutions would be to add generic names to the name deduplication context or enforce Dart case conventions:
// Pascal case for types and camel case for variables
| Dart -> "$" + name
| Rust -> genParam.Name
| _ -> name
let resolveGenParam withConstraints ctxTypeArgs (genParam: FSharpGenericParameter) =
let name = genParamName genParam
match Map.tryFind name ctxTypeArgs with
| None ->