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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
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.getBaseEntity 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 =
static member Constraint(c: FSharpGenericParameterConstraint) =
if c.IsCoercesToConstraint then
TypeHelpers.makeType 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
static member Create(gen: FSharpGenericParameter): Fable.GenericParam =
{ Name = TypeHelpers.genParamName gen
IsMeasure = gen.IsMeasure
Constraints = FsGenParam.Constraints gen }
type FsParam =
static member Make(name, typ): Fable.Parameter =
{ Name = name; Type = TypeHelpers.makeType Map.empty typ }
static member Make(p: FSharpParameter) = FsParam.Make(p.Name, p.Type)
static member Make(p: FSharpAbstractParameter) = FsParam.Make(p.Name, p.Type)
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 FsMemberFunctionOrValue(m: FSharpMemberOrFunctionOrValue) =
static member CurriedParameterGroups(m: FSharpMemberOrFunctionOrValue): Fable.Parameter list list =
m.CurriedParameterGroups
|> Seq.mapToList (Seq.mapToList (fun p -> FsParam.Make(p)))
static member TryNamedParamsIndex(m: FSharpMemberOrFunctionOrValue) =
m.Attributes
|> Helpers.tryFindAtt Atts.paramObject
|> Option.map (fun (att: FSharpAttribute) ->
match Seq.tryItem 0 att.ConstructorArguments with
| Some(_, (:?int as index)) -> index
| _ -> 0)
static member CallMemberInfo(com: Compiler, m: FSharpMemberOrFunctionOrValue): Fable.CallMemberInfo =
let namedParamsIndex =
FsMemberFunctionOrValue.TryNamedParamsIndex(m)
|> Option.defaultValue -1
{ CurriedParameterGroups =
m.CurriedParameterGroups |> Seq.mapToList (Seq.mapToListIndexed (fun i p ->
let isNamed = namedParamsIndex > -1 && i >= namedParamsIndex
{ Name = p.Name; Type = TypeHelpers.makeType Map.empty p.Type; IsNamed = isNamed }))
Attributes = m.Attributes |> Seq.toList |> List.map (fun x -> FsAtt(x) :> Fable.Attribute)
IsInstance = m.IsInstanceMember
IsGetter = m.IsPropertyGetterMethod
FullName = m.FullName
CompiledName = m.CompiledName
DeclaringEntity = m.DeclaringEntity |> Option.map (FsEnt.Ref) }
static member DisplayName(m: FSharpMemberOrFunctionOrValue) =
Naming.removeGetSetPrefix m.DisplayNameCore
interface Fable.MemberFunctionOrValue with
member _.Attributes =
m.Attributes |> Seq.map (fun x -> FsAtt(x) :> Fable.Attribute)
// These two properties are only used for member declarations,
// setting them to false for now
member _.IsMangled = false
member _.IsEnumerator = false
member _.HasSpread = Helpers.hasParamArray m
member _.IsInline = Helpers.isInline m
member _.IsPublic = Helpers.isPublicMember m
// NOTE: Using memb.IsValue doesn't work for function values
// See isModuleValueForDeclarations below
member _.IsValue = m.IsValue
member _.IsDispatchSlot = m.IsDispatchSlot
member _.IsInstance = m.IsInstanceMember
member _.IsMutable = m.IsMutable
member _.IsGetter = m.IsPropertyGetterMethod
member _.IsSetter = m.IsPropertySetterMethod
member _.IsProperty = m.IsProperty
member _.IsOverrideOrExplicitInterfaceImplementation = m.IsOverrideOrExplicitInterfaceImplementation
member _.DisplayName = FsMemberFunctionOrValue.DisplayName m
member _.CompiledName = m.CompiledName
member _.FullName = m.FullName
member _.GenericParameters = m.GenericParameters |> Seq.mapToList FsGenParam.Create
member _.CurriedParameterGroups = FsMemberFunctionOrValue.CurriedParameterGroups(m)
member _.ReturnParameter = FsParam.Make(m.ReturnParameter)
member _.ApparentEnclosingEntity = FsEnt.Ref m.ApparentEnclosingEntity
type FsEnt(ent: FSharpEntity) =
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) =
ent.DeclarationLocation.FileName
|> Path.normalizePathAndEnsureFsExtension
static member IsPublic (ent: FSharpEntity) =
not ent.Accessibility.IsPrivate
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 _.FullName = FsEnt.FullName ent
member _.BaseType =
match TypeHelpers.getBaseEntity 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.TryGetMembersFunctionsAndValues() |> Seq.map (fun x ->
FsMemberFunctionOrValue(x) :> Fable.MemberFunctionOrValue)
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 FsGenParam.Create
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 = FsEnt.IsPublic ent
member _.IsAbstractClass = ent.IsAbstractClass
member _.IsFSharpModule = ent.IsFSharpModule
member _.IsFSharpUnion = ent.IsFSharpUnion
member _.IsFSharpRecord = ent.IsFSharpRecord
member _.IsFSharpAbbreviation = ent.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 MemberInfo(?attributes: FSharpAttribute seq,
?hasSpread: bool,
?isInline: bool,
?isPublic: bool,
?isInstance: bool,
?isValue: bool,
?isMutable: bool,
?isGetter: bool,
?isSetter: bool,
?isProperty: bool,
?isEnumerator: bool,
?isOverride: bool,
?isMangled: bool) =
interface Fable.MemberInfo with
member _.Attributes =
match attributes with
| Some atts -> atts |> Seq.map (fun x -> FsAtt(x) :> Fable.Attribute)
| None -> upcast []
member _.HasSpread = defaultArg hasSpread false
member _.IsMangled = defaultArg isMangled false
member _.IsInline = defaultArg isInline false
member _.IsPublic = defaultArg isPublic true
member _.IsInstance = defaultArg isInstance true
member _.IsValue = defaultArg isValue false
member _.IsMutable = defaultArg isMutable false
member _.IsGetter = defaultArg isGetter false
member _.IsSetter = defaultArg isSetter false
member _.IsProperty = defaultArg isProperty false
member _.IsEnumerator = defaultArg isEnumerator false
member _.IsOverrideOrExplicitInterfaceImplementation = defaultArg isOverride false
type Scope = (FSharpMemberOrFunctionOrValue option * Fable.Ident * Fable.Expr option) list
type Context =
{ Scope: Scope
ScopeInlineValues: (FSharpMemberOrFunctionOrValue * FSharpExpr) list
ScopeInlineArgs: (Fable.Ident * Fable.Expr) list
UsedNamesInRootScope: Set<string>
UsedNamesInDeclarationScope: 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 = []
ScopeInlineArgs = []
UsedNamesInRootScope = defaultArg usedRootNames Set.empty
UsedNamesInDeclarationScope = 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) =
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 private getMemberMangledName trimRootModule (memb: FSharpMemberOrFunctionOrValue) =
if memb.IsExtensionMember then
let overloadSuffix = FsMemberFunctionOrValue memb |> 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 = FsMemberFunctionOrValue memb |> OverloadSuffix.getHash (FsEnt ent)
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 isPublicMember (memb: FSharpMemberOrFunctionOrValue) =
if memb.IsCompilerGenerated
then false
else not memb.Accessibility.IsPrivate
let isNonPublicMember (memb: FSharpMemberOrFunctionOrValue) =
if memb.IsCompilerGenerated
then true
else not 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
let isModuleValueAtom (com: Compiler) isMutable isPublic =
match com.Options.Language with
| Python | JavaScript | TypeScript -> isMutable && isPublic
| Rust | Php | Dart -> false
let isModuleValueForCalls com (declaringEntity: FSharpEntity) (memb: FSharpMemberOrFunctionOrValue) =
declaringEntity.IsFSharpModule
&& isModuleValueForDeclarations memb
// Mutable public values must be called as functions (see #986)
&& not(isModuleValueAtom com memb.IsMutable (isPublicMember 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 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
| 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
let getCaseRule (att: FSharpAttribute) =
match Seq.tryHead att.ConstructorArguments with
| Some(_, (:? int as rule)) -> enum<CaseRules>(rule)
| _ -> CaseRules.LowerFirst
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 -> Some (ErasedUnion(tdef, typ.GenericArguments, getCaseRule att))
| Some Atts.stringEnum -> Some (StringEnum(tdef, getCaseRule att))
| 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))
)
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.reference -> 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 "Microsoft.FSharp.Core.MatchFailureException" -> 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
| _ -> name
let resolveGenParam ctxTypeArgs (genParam: FSharpGenericParameter) =
let name = genParamName genParam
match Map.tryFind name ctxTypeArgs with
| None ->
let constraints = FsGenParam.Constraints genParam |> Seq.toList
Fable.GenericParam(name, genParam.IsMeasure, constraints)
| Some typ -> typ
// TODO: We need to filter the measure generic arguments
// But for that we need to pass the compiler here, which needs a bigger refactoring
let makeTypeGenArgs ctxTypeArgs (genArgs: IList<FSharpType>) =
genArgs |> Seq.map (fun genArg ->
if genArg.IsGenericParameter
then resolveGenParam ctxTypeArgs genArg.GenericParameter
else makeType ctxTypeArgs genArg)
|> Seq.toList
let makeTypeFromDelegate ctxTypeArgs (genArgs: IList<FSharpType>) (tdef: FSharpEntity) =
let invokeArgs() =
let invokeMember =
tdef.MembersFunctionsAndValues
|> Seq.find (fun f -> f.DisplayName = "Invoke")
invokeMember.CurriedParameterGroups[0] |> Seq.map (fun p -> p.Type),
invokeMember.ReturnParameter.Type
let argTypes, returnType =
try
// tdef.FSharpDelegateSignature doesn't work with System.Func & friends
if tdef.IsFSharp then
tdef.FSharpDelegateSignature.DelegateArguments |> Seq.map snd,
tdef.FSharpDelegateSignature.DelegateReturnType
else invokeArgs()
with _ -> invokeArgs()
let genArgs = Seq.zip (tdef.GenericParameters |> Seq.map genParamName) genArgs |> Map
let resolveType (t: FSharpType) =
if t.IsGenericParameter then Map.find (genParamName t.GenericParameter) genArgs else t
let returnType = returnType |> resolveType |> makeType ctxTypeArgs
let argTypes =
argTypes
|> Seq.map (resolveType >> makeType ctxTypeArgs)
|> Seq.toList
|> function [Fable.Unit] -> [] | argTypes -> argTypes
Fable.DelegateType(argTypes, returnType)
let numberTypes =
dict [
Types.int8, Int8
Types.uint8, UInt8
Types.int16, Int16
Types.uint16, UInt16
Types.int32, Int32
Types.uint32 , UInt32
Types.int64, Int64
Types.uint64 , UInt64
Types.bigint, BigInt
Types.nativeint, NativeInt
Types.unativeint, UNativeInt
Types.float32, Float32
Types.float64, Float64
Types.decimal, Decimal
]
let numbersWithMeasure =
dict [
"Microsoft.FSharp.Core.sbyte`1", Int8
"FSharp.UMX.byte`1", UInt8
"Microsoft.FSharp.Core.int16`1", Int16
"Microsoft.FSharp.Core.int`1", Int32
"Microsoft.FSharp.Core.int64`1", Int64
"FSharp.UMX.uint64`1", UInt64
"Microsoft.FSharp.Core.nativeint`1", NativeInt
"Microsoft.FSharp.Core.float32`1", Float32
"Microsoft.FSharp.Core.float`1", Float64
"Microsoft.FSharp.Core.decimal`1", Decimal
]
// FCS doesn't expose the abbreviated type of a MeasureAnnotatedAbbreviation,
// so we need to hard-code FSharp.UMX types
let runtimeTypesWithMeasure =
dict [
"FSharp.UMX.bool`1", Choice1Of2 Fable.Boolean
"FSharp.UMX.string`1", Choice1Of2 Fable.String
"FSharp.UMX.Guid`1", Choice2Of2 Types.guid
"FSharp.UMX.TimeSpan`1", Choice2Of2 Types.timespan