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CodePrinter.fs
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module internal Fantomas.CodePrinter
open System
open System.Collections.Generic
open Microsoft.FSharp.Compiler.Ast
open Fantomas
open Fantomas.FormatConfig
open Fantomas.SourceParser
open Fantomas.SourceTransformer
/// This type consists of contextual information which is important for formatting
type ASTContext =
{
/// Original file name without extension of the parsed AST
TopLevelModuleName: string
/// Current node is the first child of its parent
IsFirstChild: bool
/// Current node is a subnode deep down in an interface
IsInterface: bool
/// This pattern matters for formatting extern declarations
IsCStylePattern: bool
/// Range operators are naked in 'for..in..do' constructs
IsNakedRange: bool
/// The optional `|` in pattern matching and union type definitions
HasVerticalBar: bool
/// A field is rendered as union field or not
IsUnionField: bool
/// First type param might need extra spaces to avoid parsing errors on `<^`, `<'`, etc.
IsFirstTypeParam: bool
/// Check whether the context is inside DotGet to suppress whitespaces
IsInsideDotGet: bool
}
static member Default =
{ TopLevelModuleName = ""
IsFirstChild = false; IsInterface = false
IsCStylePattern = false; IsNakedRange = false
HasVerticalBar = false; IsUnionField = false
IsFirstTypeParam = false; IsInsideDotGet = false }
let rec addSpaceBeforeParensInFunCall functionOrMethod arg =
match functionOrMethod, arg with
| _, ConstExpr(Const "()", _) -> false
| SynExpr.LongIdent(_, LongIdentWithDots s, _, _), _ ->
let parts = s.Split '.'
not <| Char.IsUpper parts.[parts.Length - 1].[0]
| SynExpr.Ident(Ident s), _ -> not <| Char.IsUpper s.[0]
| SynExpr.TypeApp(e, _, _, _, _, _, _), _ -> addSpaceBeforeParensInFunCall e arg
| _ -> true
let addSpaceBeforeParensInFunDef functionOrMethod args =
match functionOrMethod, args with
| _, PatParen (PatConst(Const "()", _)) -> false
| "new", _ -> false
| (s:string), _ ->
let parts = s.Split '.'
not <| Char.IsUpper parts.[parts.Length - 1].[0]
| _ -> true
let rec genParsedInput astContext = function
| ImplFile im -> genImpFile astContext im
| SigFile si -> genSigFile astContext si
and genImpFile astContext (ParsedImplFileInput(hs, mns)) =
col sepNone hs genParsedHashDirective +> (if hs.IsEmpty then sepNone else sepNln)
+> col sepNln mns (genModuleOrNamespace astContext)
and genSigFile astContext (ParsedSigFileInput(hs, mns)) =
col sepNone hs genParsedHashDirective +> (if hs.IsEmpty then sepNone else sepNln)
+> col sepNln mns (genSigModuleOrNamespace astContext)
and genParsedHashDirective (ParsedHashDirective(h, s)) =
let printArgument arg =
match arg with
| "" -> sepNone
// Use verbatim string to escape '\' correctly
| _ when arg.Contains("\\") -> !- (sprintf "@\"%O\"" arg)
| _ -> !- (sprintf "\"%O\"" arg)
!- "#" -- h +> sepSpace +> col sepSpace s printArgument
and genModuleOrNamespace astContext (ModuleOrNamespace(ats, px, ao, s, mds, isModule)) =
genPreXmlDoc px
+> genAttributes astContext ats
+> ifElse (String.Equals(s, astContext.TopLevelModuleName, StringComparison.InvariantCultureIgnoreCase)) sepNone
(ifElse isModule (!- "module ") (!- "namespace ")
+> opt sepSpace ao genAccess +> ifElse (s = "") (!- "global") (!- s) +> rep 2 sepNln)
+> genModuleDeclList astContext mds
and genSigModuleOrNamespace astContext (SigModuleOrNamespace(ats, px, ao, s, mds, isModule)) =
genPreXmlDoc px
+> genAttributes astContext ats
+> ifElse (String.Equals(s, astContext.TopLevelModuleName, StringComparison.InvariantCultureIgnoreCase)) sepNone
(ifElse isModule (!- "module ") (!- "namespace ")
+> opt sepSpace ao genAccess -- s +> rep 2 sepNln)
+> genSigModuleDeclList astContext mds
and genModuleDeclList astContext = function
| [x] -> genModuleDecl astContext x
| OpenL(xs, ys) ->
fun ctx ->
let xs = sortAndDeduplicate ((|Open|_|) >> Option.get) xs ctx
match ys with
| [] -> col sepNln xs (genModuleDecl astContext) ctx
| _ -> (col sepNln xs (genModuleDecl astContext) +> rep 2 sepNln +> genModuleDeclList astContext ys) ctx
| HashDirectiveL(xs, ys)
| DoExprAttributesL(xs, ys)
| ModuleAbbrevL(xs, ys)
| OneLinerLetL(xs, ys) ->
match ys with
| [] -> col sepNln xs (genModuleDecl astContext)
| _ -> col sepNln xs (genModuleDecl astContext) +> rep 2 sepNln +> genModuleDeclList astContext ys
| MultilineModuleDeclL(xs, ys) ->
match ys with
| [] -> col (rep 2 sepNln) xs (genModuleDecl astContext)
| _ -> col (rep 2 sepNln) xs (genModuleDecl astContext) +> rep 2 sepNln +> genModuleDeclList astContext ys
| _ -> sepNone
and genSigModuleDeclList astContext = function
| [x] -> genSigModuleDecl astContext x
| SigOpenL(xs, ys) ->
fun ctx ->
let xs = sortAndDeduplicate ((|SigOpen|_|) >> Option.get) xs ctx
match ys with
| [] -> col sepNln xs (genSigModuleDecl astContext) ctx
| _ -> (col sepNln xs (genSigModuleDecl astContext) +> rep 2 sepNln +> genSigModuleDeclList astContext ys) ctx
| SigHashDirectiveL(xs, ys) ->
match ys with
| [] -> col sepNone xs (genSigModuleDecl astContext)
| _ -> col sepNone xs (genSigModuleDecl astContext) +> sepNln +> genSigModuleDeclList astContext ys
| SigModuleAbbrevL(xs, ys)
| SigValL(xs, ys) ->
match ys with
| [] -> col sepNln xs (genSigModuleDecl astContext)
| _ -> col sepNln xs (genSigModuleDecl astContext) +> rep 2 sepNln +> genSigModuleDeclList astContext ys
| SigMultilineModuleDeclL(xs, ys) ->
match ys with
| [] -> col (rep 2 sepNln) xs (genSigModuleDecl astContext)
| _ -> col (rep 2 sepNln) xs (genSigModuleDecl astContext) +> rep 2 sepNln +> genSigModuleDeclList astContext ys
| _ -> sepNone
and genModuleDecl astContext = function
| Attributes(ats) ->
col sepNln ats (genAttribute astContext)
| DoExpr(e) ->
genExpr astContext e
| Exception(ex) ->
genException astContext ex
| HashDirective(p) ->
genParsedHashDirective p
| Extern(ats, px, ao, t, s, ps) ->
genPreXmlDoc px
+> genAttributes astContext ats
-- "extern " +> genType astContext false t +> sepSpace +> opt sepSpace ao genAccess
-- s +> sepOpenT +> col sepComma ps (genPat { astContext with IsCStylePattern = true }) +> sepCloseT
// Add a new line after module-level let bindings
| Let(b) ->
genLetBinding { astContext with IsFirstChild = true } "let " b
| LetRec(b::bs) ->
genLetBinding { astContext with IsFirstChild = true } "let rec " b
+> colPre (rep 2 sepNln) (rep 2 sepNln) bs (genLetBinding { astContext with IsFirstChild = false } "and ")
| ModuleAbbrev(s1, s2) ->
!- "module " -- s1 +> sepEq +> sepSpace -- s2
| NamespaceFragment(m) ->
failwithf "NamespaceFragment hasn't been implemented yet: %O" m
| NestedModule(ats, px, ao, s, mds) ->
genPreXmlDoc px
+> genAttributes astContext ats -- "module " +> opt sepSpace ao genAccess -- s +> sepEq
+> indent +> sepNln +> genModuleDeclList astContext mds +> unindent
| Open(s) ->
!- (sprintf "open %s" s)
// There is no nested types and they are recursive if there are more than one definition
| Types(t::ts) ->
genTypeDefn { astContext with IsFirstChild = true } t
+> colPre (rep 2 sepNln) (rep 2 sepNln) ts (genTypeDefn { astContext with IsFirstChild = false })
| md ->
failwithf "Unexpected module declaration: %O" md
and genSigModuleDecl astContext = function
| SigException(ex) ->
genSigException astContext ex
| SigHashDirective(p) ->
genParsedHashDirective p
| SigVal(v) ->
genVal astContext v
| SigModuleAbbrev(s1, s2) ->
!- "module " -- s1 +> sepEq +> sepSpace -- s2
| SigNamespaceFragment(m) ->
failwithf "NamespaceFragment is not supported yet: %O" m
| SigNestedModule(ats, px, ao, s, mds) ->
genPreXmlDoc px
+> genAttributes astContext ats -- "module " +> opt sepSpace ao genAccess -- s +> sepEq
+> indent +> sepNln +> genSigModuleDeclList astContext mds +> unindent
| SigOpen(s) ->
!- (sprintf "open %s" s)
| SigTypes(t::ts) ->
genSigTypeDefn { astContext with IsFirstChild = true } t
+> colPre (rep 2 sepNln) (rep 2 sepNln) ts (genSigTypeDefn { astContext with IsFirstChild = false })
| md ->
failwithf "Unexpected module signature declaration: %O" md
and genAccess (Access s) = !- s
and genAttribute astContext (Attribute(s, e, target)) =
match e with
// Special treatment for function application on attributes
| ConstExpr(Const "()", _) ->
!- "[<" +> opt sepColonFixed target (!-) -- s -- ">]"
| e ->
!- "[<" +> opt sepColonFixed target (!-) -- s +> genExpr astContext e -- ">]"
and genAttributesCore astContext ats =
let genAttributeExpr astContext (Attribute(s, e, target)) =
match e with
| ConstExpr(Const "()", _) ->
opt sepColonFixed target (!-) -- s
| e ->
opt sepColonFixed target (!-) -- s +> genExpr astContext e
ifElse (Seq.isEmpty ats) sepNone (!- "[<" +> col sepSemi ats (genAttributeExpr astContext) -- ">]")
and genOnelinerAttributes astContext ats =
ifElse (Seq.isEmpty ats) sepNone (genAttributesCore astContext ats +> sepSpace)
/// Try to group attributes if they are on the same line
/// Separate same-line attributes by ';'
/// Each bucket is printed in a different line
and genAttributes astContext ats =
ats
|> Seq.groupBy (fun at -> at.Range.StartLine)
|> Seq.map snd
|> Seq.toList
|> fun atss -> colPost sepNln sepNln atss (genAttributesCore astContext)
and genPreXmlDoc (PreXmlDoc lines) ctx =
if ctx.Config.StrictMode then
colPost sepNln sepNln lines (sprintf "///%s" >> (!-)) ctx
else ctx
and breakNln astContext brk e =
ifElse brk (indent +> sepNln +> genExpr astContext e +> unindent)
(indent +> autoNln (genExpr astContext e) +> unindent)
and breakNlnOrAddSpace astContext brk e =
ifElse brk (indent +> sepNln +> genExpr astContext e +> unindent)
(indent +> autoNlnOrSpace (genExpr astContext e) +> unindent)
/// Preserve a break even if the expression is a one-liner
and preserveBreakNln astContext e ctx =
breakNln astContext (checkPreserveBreakForExpr e ctx) e ctx
and preserveBreakNlnOrAddSpace astContext e ctx =
breakNlnOrAddSpace astContext (checkPreserveBreakForExpr e ctx) e ctx
/// Break but doesn't indent the expression
and noIndentBreakNln astContext e ctx =
ifElse (checkPreserveBreakForExpr e ctx) (sepNln +> genExpr astContext e) (autoNln (genExpr astContext e)) ctx
and genTyparList astContext tps =
ifElse (List.atMostOne tps) (col wordOr tps (genTypar astContext)) (sepOpenT +> col wordOr tps (genTypar astContext) +> sepCloseT)
and genTypeParam astContext tds tcs =
ifElse (List.isEmpty tds) sepNone
(!- "<" +> coli sepComma tds (fun i decl -> genTyparDecl { astContext with IsFirstTypeParam = i = 0 } decl)
+> colPre (!- " when ") wordAnd tcs (genTypeConstraint astContext) -- ">")
and genLetBinding astContext pref b =
match b with
| LetBinding(ats, px, ao, isInline, isMutable, p, e) ->
let prefix =
genPreXmlDoc px
+> ifElse astContext.IsFirstChild (genAttributes astContext ats -- pref)
(!- pref +> genOnelinerAttributes astContext ats)
+> opt sepSpace ao genAccess
+> ifElse isMutable (!- "mutable ") sepNone +> ifElse isInline (!- "inline ") sepNone
+> genPat astContext p
match e with
| TypedExpr(Typed, e, t) -> prefix +> sepColon +> genType astContext false t +> sepEq
+> preserveBreakNlnOrAddSpace astContext e
| e -> prefix +> sepEq +> preserveBreakNlnOrAddSpace astContext e
| DoBinding(ats, px, e) ->
let prefix = if pref.Contains("let") then pref.Replace("let", "do") else "do "
genPreXmlDoc px
+> genAttributes astContext ats -- prefix +> preserveBreakNln astContext e
| b ->
failwithf "%O isn't a let binding" b
and genShortGetProperty astContext e =
sepEq +> preserveBreakNlnOrAddSpace astContext e
and genProperty astContext prefix ao propertyKind ps e =
let tuplerize ps =
let rec loop acc = function
| [p] -> (List.rev acc, p)
| p1::ps -> loop (p1::acc) ps
| [] -> invalidArg "p" "Patterns should not be empty"
loop [] ps
match ps with
| [PatTuple ps] ->
let (ps, p) = tuplerize ps
!- prefix +> opt sepSpace ao genAccess -- propertyKind
+> ifElse (List.atMostOne ps) (col sepComma ps (genPat astContext) +> sepSpace)
(sepOpenT +> col sepComma ps (genPat astContext) +> sepCloseT +> sepSpace)
+> genPat astContext p +> sepEq +> preserveBreakNlnOrAddSpace astContext e
| ps ->
!- prefix +> opt sepSpace ao genAccess -- propertyKind +> col sepSpace ps (genPat astContext)
+> sepEq +> preserveBreakNlnOrAddSpace astContext e
and genPropertyWithGetSet astContext (b1, b2) =
match b1, b2 with
| PropertyBinding(ats, px, ao, isInline, mf1, PatLongIdent(ao1, s1, ps1, _), e1),
PropertyBinding(_, _, _, _, _, PatLongIdent(ao2, _, ps2, _), e2) ->
let prefix =
genPreXmlDoc px
+> genAttributes astContext ats +> genMemberFlags astContext mf1
+> ifElse isInline (!- "inline ") sepNone +> opt sepSpace ao genAccess
assert(ps1 |> Seq.map fst |> Seq.forall Option.isNone)
assert(ps2 |> Seq.map fst |> Seq.forall Option.isNone)
let ps1 = List.map snd ps1
let ps2 = List.map snd ps2
prefix -- s1 +> sepSpace +> indent +> sepNln
+> genProperty astContext "with " ao1 "get " ps1 e1 +> sepNln
+> genProperty astContext "and " ao2 "set " ps2 e2
+> unindent
| _ -> sepNone
/// Each member is separated by a new line.
and genMemberBindingList astContext = function
| [x] -> genMemberBinding astContext x
| MultilineBindingL(xs, ys) ->
let prefix = sepNln +> col (rep 2 sepNln) xs (function
| Pair(x1, x2) -> genPropertyWithGetSet astContext (x1, x2)
| Single x -> genMemberBinding astContext x)
match ys with
| [] -> prefix
| _ -> prefix +> rep 2 sepNln +> genMemberBindingList astContext ys
| OneLinerBindingL(xs, ys) ->
match ys with
| [] -> col sepNln xs (genMemberBinding astContext)
| _ -> col sepNln xs (genMemberBinding astContext) +> sepNln +> genMemberBindingList astContext ys
| _ -> sepNone
and genMemberBinding astContext b =
match b with
| PropertyBinding(ats, px, ao, isInline, mf, p, e) ->
let prefix =
genPreXmlDoc px
+> genAttributes astContext ats +> genMemberFlags astContext mf
+> ifElse isInline (!- "inline ") sepNone +> opt sepSpace ao genAccess
let propertyKind =
match mf with
| MFProperty PropertyGet -> "get "
| MFProperty PropertySet -> "set "
| mf -> failwithf "Unexpected member flags: %O" mf
match p with
| PatLongIdent(ao, s, ps, _) ->
assert (ps |> Seq.map fst |> Seq.forall Option.isNone)
match ao, propertyKind, ps with
| None, "get ", [_, PatParen(PatConst(Const "()", _))] ->
// Provide short-hand notation `x.Member = ...` for `x.Member with get()` getters
prefix -- s +> genShortGetProperty astContext e
| _ ->
let ps = List.map snd ps
prefix -- s +> sepSpace +> indent +> sepNln +>
genProperty astContext "with " ao propertyKind ps e
+> unindent
| p -> failwithf "Unexpected pattern: %O" p
| MemberBinding(ats, px, ao, isInline, mf, p, e) ->
let prefix =
genPreXmlDoc px
+> genAttributes astContext ats +> genMemberFlags astContext mf
+> ifElse isInline (!- "inline ") sepNone +> opt sepSpace ao genAccess +> genPat astContext p
match e with
| TypedExpr(Typed, e, t) -> prefix +> sepColon +> genType astContext false t +> sepEq +> preserveBreakNlnOrAddSpace astContext e
| e -> prefix +> sepEq +> preserveBreakNlnOrAddSpace astContext e
| ExplicitCtor(ats, px, ao, p, e, so) ->
let prefix =
genPreXmlDoc px
+> genAttributes astContext ats
+> opt sepSpace ao genAccess +> genPat astContext p
+> opt sepNone so (sprintf " as %s" >> (!-))
match e with
// Handle special "then" block i.e. fake sequential expressions in constructors
| Sequential(e1, e2, false) ->
prefix +> sepEq +> indent +> sepNln
+> genExpr astContext e1 ++ "then " +> preserveBreakNln astContext e2 +> unindent
| e -> prefix +> sepEq +> preserveBreakNlnOrAddSpace astContext e
| b -> failwithf "%O isn't a member binding" b
and genMemberFlags astContext = function
| MFMember _ -> !- "member "
| MFStaticMember _ -> !- "static member "
| MFConstructor _ -> sepNone
| MFOverride _ -> ifElse astContext.IsInterface (!- "member ") (!- "override ")
and genVal astContext (Val(ats, px, ao, s, t, vi, _)) =
let (FunType namedArgs) = (t, vi)
genPreXmlDoc px
+> genAttributes astContext ats
+> atCurrentColumn (indent -- "val " +> opt sepSpace ao genAccess -- s
+> sepColon +> genTypeList astContext namedArgs +> unindent)
and genRecordFieldName astContext (RecordFieldName(s, eo)) =
opt sepNone eo (fun e -> !- s +> sepEq +> preserveBreakNlnOrAddSpace astContext e)
and genExpr astContext = function
| SingleExpr(kind, e) -> str kind +> genExpr astContext e
| ConstExpr(c) -> genConst c
| NullExpr -> !- "null"
// Not sure about the role of e1
| Quote(_, e2, isRaw) ->
let e = genExpr astContext e2
ifElse isRaw (!- "<@@ " +> e -- " @@>") (!- "<@ " +> e -- " @>")
| TypedExpr(TypeTest, e, t) -> genExpr astContext e -- " :? " +> genType astContext false t
| TypedExpr(New, e, t) ->
!- "new " +> genType astContext false t +> ifElse (hasParenthesis e) sepNone sepSpace +> genExpr astContext e
| TypedExpr(Downcast, e, t) -> genExpr astContext e -- " :?> " +> genType astContext false t
| TypedExpr(Upcast, e, t) -> genExpr astContext e -- " :> " +> genType astContext false t
| TypedExpr(Typed, e, t) -> genExpr astContext e +> sepColon +> genType astContext false t
| Tuple es -> atCurrentColumn (coli sepComma es (fun i -> if i = 0 then genExpr astContext else noIndentBreakNln astContext))
| ArrayOrList(isArray, [], _) ->
ifElse isArray (sepOpenAFixed +> sepCloseAFixed) (sepOpenLFixed +> sepCloseLFixed)
| ArrayOrList(isArray, xs, isSimple) ->
let sep = ifElse isSimple sepSemi sepSemiNln
ifElse isArray (sepOpenA +> atCurrentColumn (colAutoNlnSkip0 sep xs (genExpr astContext)) +> sepCloseA)
(sepOpenL +> atCurrentColumn (colAutoNlnSkip0 sep xs (genExpr astContext)) +> sepCloseL)
| Record(inheritOpt, xs, eo) ->
sepOpenS
+> opt (if xs.IsEmpty then sepNone else sepSemi) inheritOpt
(fun (typ, expr) -> !- "inherit " +> genType astContext false typ +> genExpr astContext expr)
+> opt (!- " with ") eo (genExpr astContext) +> atCurrentColumn (col sepSemiNln xs (genRecordFieldName astContext))
+> sepCloseS
| ObjExpr(t, eio, bd, ims) ->
// Check the role of the second part of eio
let param = opt sepNone (Option.map fst eio) (genExpr astContext)
sepOpenS +>
atCurrentColumn (!- "new " +> genType astContext false t +> param -- " with"
+> indent +> sepNln +> genMemberBindingList { astContext with IsInterface = true } bd +> unindent
+> colPre sepNln sepNln ims (genInterfaceImpl astContext)) +> sepCloseS
| While(e1, e2) ->
atCurrentColumn (!- "while " +> genExpr astContext e1 -- " do"
+> indent +> sepNln +> genExpr astContext e2 +> unindent)
| For(s, e1, e2, e3, isUp) ->
atCurrentColumn (!- (sprintf "for %s = " s) +> genExpr astContext e1
+> ifElse isUp (!- " to ") (!- " downto ") +> genExpr astContext e2 -- " do"
+> indent +> sepNln +> genExpr astContext e3 +> unindent)
// Handle the form 'for i in e1 -> e2'
| ForEach(p, e1, e2, isArrow) ->
atCurrentColumn (!- "for " +> genPat astContext p -- " in " +> genExpr { astContext with IsNakedRange = true } e1
+> ifElse isArrow (sepArrow +> preserveBreakNln astContext e2) (!- " do" +> indent +> sepNln +> genExpr astContext e2 +> unindent))
| CompExpr(isArrayOrList, e) ->
let astContext = { astContext with IsNakedRange = true }
ifElse isArrayOrList (genExpr astContext e)
(sepOpenS +> noIndentBreakNln astContext e
+> ifElse (checkBreakForExpr e) (unindent +> sepNln +> sepCloseSFixed) sepCloseS)
| ArrayOrListOfSeqExpr(isArray, e) ->
let astContext = { astContext with IsNakedRange = true }
ifElse isArray (sepOpenA +> genExpr astContext e +> sepCloseA) (sepOpenL +> genExpr astContext e +> sepCloseL)
| JoinIn(e1, e2) -> genExpr astContext e1 -- " in " +> genExpr astContext e2
| Paren(DesugaredLambda(cps, e)) ->
sepOpenT -- "fun " +> col sepSpace cps (genComplexPats astContext) +> sepArrow +> noIndentBreakNln astContext e +> sepCloseT
| DesugaredLambda(cps, e) ->
!- "fun " +> col sepSpace cps (genComplexPats astContext) +> sepArrow +> preserveBreakNln astContext e
| Paren(Lambda(e, sps)) ->
sepOpenT -- "fun " +> col sepSpace sps (genSimplePats astContext) +> sepArrow +> noIndentBreakNln astContext e +> sepCloseT
// When there are parentheses, most likely lambda will appear in function application
| Lambda(e, sps) ->
!- "fun " +> col sepSpace sps (genSimplePats astContext) +> sepArrow +> preserveBreakNln astContext e
| MatchLambda(sp, _) -> !- "function " +> colPre sepNln sepNln sp (genClause astContext true)
| Match(e, cs) ->
atCurrentColumn (!- "match " +> genExpr astContext e -- " with" +> colPre sepNln sepNln cs (genClause astContext true))
| TraitCall(tps, msg, e) ->
genTyparList astContext tps +> sepColon +> sepOpenT +> genMemberSig astContext msg +> sepCloseT
+> sepSpace +> genExpr astContext e
| Paren e ->
// Parentheses nullify effects of no space inside DotGet
sepOpenT +> genExpr { astContext with IsInsideDotGet = false } e +> sepCloseT
| CompApp(s, e) ->
!- s +> sepSpace +> sepOpenS +> genExpr { astContext with IsNakedRange = true } e
+> ifElse (checkBreakForExpr e) (sepNln +> sepCloseSFixed) sepCloseS
// This supposes to be an infix function, but for some reason it isn't picked up by InfixApps
| App(Var "?", e::es) -> genExpr astContext e -- "?" +> col sepSpace es (genExpr astContext)
| App(Var "..", [e1; e2]) ->
let expr = genExpr astContext e1 -- ".." +> genExpr astContext e2
ifElse astContext.IsNakedRange expr (sepOpenS +> expr +> sepCloseS)
| App(Var ".. ..", [e1; e2; e3]) ->
let expr = genExpr astContext e1 -- ".." +> genExpr astContext e2 -- ".." +> genExpr astContext e3
ifElse astContext.IsNakedRange expr (sepOpenS +> expr +> sepCloseS)
// Separate two prefix ops by spaces
| PrefixApp(s1, PrefixApp(s2, e)) -> !- (sprintf "%s %s" s1 s2) +> genExpr astContext e
| PrefixApp(s, e) -> !- s +> genExpr astContext e
// Handle spaces of infix application based on which category it belongs to
| InfixApps(e, es) ->
// Only put |> on the same line in a very trivial expression
atCurrentColumn (genExpr astContext e +> genInfixApps astContext (checkNewLine e es) es)
| TernaryApp(e1,e2,e3) ->
atCurrentColumn (genExpr astContext e1 +> !- "?" +> genExpr astContext e2 +> sepSpace +> !- "<-" +> sepSpace +> genExpr astContext e3)
// This filters a few long examples of App
| DotGetAppSpecial(s, es) ->
!- s
+> atCurrentColumn
(colAutoNlnSkip0 sepNone es (fun (s, e) ->
(!- (sprintf ".%s" s)
+> ifElse (hasParenthesis e) sepNone sepSpace +> genExpr astContext e)))
| DotGetApp(e, es) ->
let expr =
match e with
| App(e1, [e2]) ->
noNln (genExpr astContext e1 +> ifElse (hasParenthesis e2) sepNone sepSpace +> genExpr astContext e2)
| _ ->
noNln (genExpr astContext e)
expr
+> indent
+> (col sepNone es (fun (s, e) ->
autoNln (!- (sprintf ".%s" s)
+> ifElse (hasParenthesis e) sepNone sepSpace +> genExpr astContext e)))
+> unindent
// Unlike infix app, function application needs a level of indentation
| App(e1, [e2]) ->
atCurrentColumn (genExpr astContext e1 +>
ifElse (not astContext.IsInsideDotGet)
(ifElse (hasParenthesis e2)
(ifElse (addSpaceBeforeParensInFunCall e1 e2) sepBeforeArg sepNone)
sepSpace)
sepNone
+> indent +> autoNln (genExpr astContext e2) +> unindent)
// Always spacing in multiple arguments
| App(e, es) ->
atCurrentColumn (genExpr astContext e +>
colPre sepSpace sepSpace es (fun e -> indent +> autoNln (genExpr astContext e) +> unindent))
| TypeApp(e, ts) -> genExpr astContext e -- "<" +> col sepComma ts (genType astContext false) -- ">"
| LetOrUses(bs, e) ->
atCurrentColumn (genLetOrUseList astContext bs +> sepNln +> genExpr astContext e)
// Could customize a bit if e is single line
| TryWith(e, cs) ->
let prefix = !- "try " +> indent +> sepNln +> genExpr astContext e +> unindent ++ "with"
match cs with
| [c] ->
atCurrentColumn (prefix +> sepSpace +> genClause astContext false c)
| _ ->
atCurrentColumn (prefix +> indentOnWith +> sepNln +> col sepNln cs (genClause astContext true) +> unindentOnWith)
| TryFinally(e1, e2) ->
atCurrentColumn (!- "try " +> indent +> sepNln +> genExpr astContext e1 +> unindent ++ "finally"
+> indent +> sepNln +> genExpr astContext e2 +> unindent)
| SequentialSimple es -> atCurrentColumn (colAutoNlnSkip0 sepSemi es (genExpr astContext))
// It seems too annoying to use sepSemiNln
| Sequentials es -> atCurrentColumn (col sepNln es (genExpr astContext))
// A generalization of IfThenElse
| ElIf((e1,e2, _)::es, en) ->
atCurrentColumn (!- "if " +> ifElse (checkBreakForExpr e1) (genExpr astContext e1 ++ "then") (genExpr astContext e1 +- "then") -- " "
+> preserveBreakNln astContext e2
+> fun ctx -> col sepNone es (fun (e1, e2, r) ->
ifElse (startWith "elif" r ctx) (!+ "elif ") (!+ "else if ")
+> ifElse (checkBreakForExpr e1) (genExpr astContext e1 ++ "then") (genExpr astContext e1 +- "then")
-- " " +> preserveBreakNln astContext e2) ctx
++ "else " +> preserveBreakNln astContext en)
| IfThenElse(e1, e2, None) ->
atCurrentColumn (!- "if " +> ifElse (checkBreakForExpr e1) (genExpr astContext e1 ++ "then") (genExpr astContext e1 +- "then")
-- " " +> preserveBreakNln astContext e2)
// At this stage, all symbolic operators have been handled.
| OptVar(s, isOpt) -> ifElse isOpt (!- "?") sepNone -- s
| LongIdentSet(s, e) -> !- (sprintf "%s <- " s) +> genExpr astContext e
| DotIndexedGet(e, es) -> genExpr astContext e -- "." +> sepOpenLFixed +> genIndexers astContext es +> sepCloseLFixed
| DotIndexedSet(e1, es, e2) -> genExpr astContext e1 -- ".[" +> genIndexers astContext es -- "] <- " +> genExpr astContext e2
| DotGet(e, s) ->
genExpr { astContext with IsInsideDotGet = true } e -- sprintf ".%s" s
| DotSet(e1, s, e2) -> genExpr astContext e1 -- sprintf ".%s <- " s +> genExpr astContext e2
| LetOrUseBang(isUse, p, e1, e2) ->
atCurrentColumn (ifElse isUse (!- "use! ") (!- "let! ")
+> genPat astContext p -- " = " +> genExpr astContext e1 +> sepNln +> genExpr astContext e2)
| ParsingError r ->
raise <| FormatException (sprintf "Parsing error(s) between line %i column %i and line %i column %i"
r.StartLine (r.StartColumn + 1) r.EndLine (r.EndColumn + 1))
| UnsupportedExpr r ->
raise <| FormatException (sprintf "Unsupported construct(s) between line %i column %i and line %i column %i"
r.StartLine (r.StartColumn + 1) r.EndLine (r.EndColumn + 1))
| e -> failwithf "Unexpected expression: %O" e
and genLetOrUseList astContext = function
| [p, x] -> genLetBinding { astContext with IsFirstChild = true } p x
| OneLinerLetOrUseL(xs, ys) ->
match ys with
| [] ->
col sepNln xs (fun (p, x) -> genLetBinding { astContext with IsFirstChild = p <> "and" } p x)
| _ ->
col sepNln xs (fun (p, x) -> genLetBinding { astContext with IsFirstChild = p <> "and" } p x)
+> rep 2 sepNln +> genLetOrUseList astContext ys
| MultilineLetOrUseL(xs, ys) ->
match ys with
| [] ->
col (rep 2 sepNln) xs (fun (p, x) -> genLetBinding { astContext with IsFirstChild = p <> "and" } p x)
// Add a trailing new line to separate these with the main expression
+> sepNln
| _ ->
col (rep 2 sepNln) xs (fun (p, x) -> genLetBinding { astContext with IsFirstChild = p <> "and" } p x)
+> rep 2 sepNln +> genLetOrUseList astContext ys
| _ -> sepNone
/// When 'hasNewLine' is set, the operator is forced to be in a new line
and genInfixApps astContext hasNewLine = function
| (s, e)::es ->
(ifElse hasNewLine (sepNln -- s +> sepSpace +> genExpr astContext e)
(ifElse (NoSpaceInfixOps.Contains s) (!- s +> autoNln (genExpr astContext e))
(ifElse (NoBreakInfixOps.Contains s) (sepSpace -- s +> sepSpace +> genExpr astContext e)
(sepSpace +> autoNln (!- s +> sepSpace +> genExpr astContext e)))))
+> genInfixApps astContext (hasNewLine || checkNewLine e es) es
| [] -> sepNone
/// Use in indexed set and get only
and genIndexers astContext = function
| Indexer(Pair(IndexedVar eo1, IndexedVar eo2)) :: es ->
ifElse (eo1.IsNone && eo2.IsNone) (!- "*")
(opt sepNone eo1 (genExpr astContext) -- ".." +> opt sepNone eo2 (genExpr astContext))
+> ifElse es.IsEmpty sepNone (sepComma +> genIndexers astContext es)
| Indexer(Single(IndexedVar eo)) :: es ->
ifElse eo.IsNone (!- "*") (opt sepNone eo (genExpr astContext))
+> ifElse es.IsEmpty sepNone (sepComma +> genIndexers astContext es)
| Indexer(Single e) :: es ->
genExpr astContext e +> ifElse es.IsEmpty sepNone (sepComma +> genIndexers astContext es)
| _ -> sepNone
and genTypeDefn astContext (TypeDef(ats, px, ao, tds, tcs, tdr, ms, s)) =
let typeName =
genPreXmlDoc px
+> ifElse astContext.IsFirstChild (genAttributes astContext ats -- "type ")
(!- "and " +> genOnelinerAttributes astContext ats)
+> opt sepSpace ao genAccess -- s
+> genTypeParam astContext tds tcs
match tdr with
| Simple(TDSREnum ecs) ->
typeName +> sepEq
+> indent +> sepNln
+> col sepNln ecs (genEnumCase { astContext with HasVerticalBar = true })
+> genMemberDefnList { astContext with IsInterface = false } ms
// Add newline after un-indent to be spacing-correct
+> unindent
| Simple(TDSRUnion(ao', xs)) ->
typeName +> sepEq
+> indent +> sepNln +> opt sepNln ao' genAccess
+> col sepNln xs (genUnionCase { astContext with HasVerticalBar = true })
+> genMemberDefnList { astContext with IsInterface = false } ms
+> unindent
| Simple(TDSRRecord(ao', fs)) ->
typeName +> sepEq
+> indent +> sepNln +> opt sepSpace ao' genAccess +> sepOpenS
+> atCurrentColumn (col sepSemiNln fs (genField astContext "")) +> sepCloseS
+> genMemberDefnList { astContext with IsInterface = false } ms
+> unindent
| Simple TDSRNone ->
typeName
| Simple(TDSRTypeAbbrev t) ->
typeName +> sepEq +> sepSpace +> genType astContext false t
| Simple(TDSRException(ExceptionDefRepr(ats, px, ao, uc))) ->
genExceptionBody astContext ats px ao uc
| ObjectModel(TCSimple (TCStruct | TCInterface | TCClass) as tdk, MemberDefnList(impCtor, others)) ->
let isInterface =
match tdk with
| TCSimple TCInterface -> true
| _ -> false
let astContext = { astContext with IsInterface = isInterface}
typeName +> opt sepNone impCtor (genMemberDefn astContext) +> sepEq
+> indent +> sepNln +> genTypeDefKind tdk
+> indent +> genMemberDefnList astContext others +> unindent
++ "end" +> unindent
| ObjectModel(TCSimple TCAugmentation, _) ->
typeName -- " with" +> indent
// Remember that we use MemberDefn of parent node
+> genMemberDefnList { astContext with IsInterface = false } ms +> unindent
| ObjectModel(TCDelegate(FunType ts), _) ->
typeName +> sepEq +> sepSpace -- "delegate of " +> genTypeList astContext ts
| ObjectModel(_, MemberDefnList(impCtor, others)) ->
typeName +> opt sepNone impCtor (genMemberDefn { astContext with IsInterface = false }) +> sepEq +> indent
+> genMemberDefnList { astContext with IsInterface = false } others +> unindent
| ExceptionRepr(ExceptionDefRepr(ats, px, ao, uc)) ->
genExceptionBody astContext ats px ao uc
and genSigTypeDefn astContext (SigTypeDef(ats, px, ao, tds, tcs, tdr, ms, s)) =
let typeName =
genPreXmlDoc px
+> ifElse astContext.IsFirstChild (genAttributes astContext ats -- "type ")
(!- "and " +> genOnelinerAttributes astContext ats)
+> opt sepSpace ao genAccess -- s
+> genTypeParam astContext tds tcs
match tdr with
| SigSimple(TDSREnum ecs) ->
typeName +> sepEq
+> indent +> sepNln
+> col sepNln ecs (genEnumCase { astContext with HasVerticalBar = true })
+> colPre sepNln sepNln ms (genMemberSig astContext)
// Add newline after un-indent to be spacing-correct
+> unindent
| SigSimple(TDSRUnion(ao', xs)) ->
typeName +> sepEq
+> indent +> sepNln +> opt sepNln ao' genAccess
+> col sepNln xs (genUnionCase { astContext with HasVerticalBar = true })
+> colPre sepNln sepNln ms (genMemberSig astContext)
+> unindent
| SigSimple(TDSRRecord(ao', fs)) ->
typeName +> sepEq
+> indent +> sepNln +> opt sepNln ao' genAccess +> sepOpenS
+> atCurrentColumn (col sepSemiNln fs (genField astContext "")) +> sepCloseS
+> colPre sepNln sepNln ms (genMemberSig astContext)
+> unindent
| SigSimple TDSRNone ->
typeName
| SigSimple(TDSRTypeAbbrev t) ->
typeName +> sepEq +> sepSpace +> genType astContext false t
| SigSimple(TDSRException(ExceptionDefRepr(ats, px, ao, uc))) ->
genExceptionBody astContext ats px ao uc
| SigObjectModel(TCSimple (TCStruct | TCInterface | TCClass) as tdk, mds) ->
typeName +> sepEq +> indent +> sepNln +> genTypeDefKind tdk
+> indent +> colPre sepNln sepNln mds (genMemberSig astContext) +> unindent
++ "end" +> unindent
| SigObjectModel(TCSimple TCAugmentation, _) ->
typeName -- " with" +> indent +> sepNln
// Remember that we use MemberSig of parent node
+> col sepNln ms (genMemberSig astContext) +> unindent
| SigObjectModel(TCDelegate(FunType ts), _) ->
typeName +> sepEq +> sepSpace -- "delegate of " +> genTypeList astContext ts
| SigObjectModel(_, mds) ->
typeName +> sepEq +> indent +> sepNln
+> col sepNln mds (genMemberSig astContext) +> unindent
| SigExceptionRepr(SigExceptionDefRepr(ats, px, ao, uc)) ->
genExceptionBody astContext ats px ao uc
and genMemberSig astContext = function
| MSMember(Val(ats, px, ao, s, t, vi, _), mf) ->
let (FunType namedArgs) = (t, vi)
genPreXmlDoc px +> genAttributes astContext ats
+> atCurrentColumn (indent +> genMemberFlags { astContext with IsInterface = false } mf +> opt sepNone ao genAccess
+> ifElse (s = "``new``") (!- "new") (!- s)
+> sepColon +> genTypeList astContext namedArgs +> unindent)
| MSInterface t -> !- "interface " +> genType astContext false t
| MSInherit t -> !- "inherit " +> genType astContext false t
| MSValField f -> genField astContext "val " f
| MSNestedType _ -> invalidArg "md" "This is not implemented in F# compiler"
and genTyparDecl astContext (TyparDecl(ats, tp)) =
genOnelinerAttributes astContext ats +> genTypar astContext tp
and genTypeDefKind = function
| TCSimple TCUnspecified -> sepNone
| TCSimple TCClass -> !- "class"
| TCSimple TCInterface -> !- "interface"
| TCSimple TCStruct -> !- "struct"
| TCSimple TCRecord -> sepNone
| TCSimple TCUnion -> sepNone
| TCSimple TCAbbrev -> sepNone
| TCSimple TCHiddenRepr -> sepNone
| TCSimple TCAugmentation -> sepNone
| TCSimple TCILAssemblyCode -> sepNone
| TCDelegate _ -> sepNone
and genExceptionBody astContext ats px ao uc =
genPreXmlDoc px
+> genAttributes astContext ats -- "exception "
+> opt sepSpace ao genAccess +> genUnionCase { astContext with HasVerticalBar = false } uc
and genException astContext (ExceptionDef(ats, px, ao, uc, ms)) =
genExceptionBody astContext ats px ao uc
+> ifElse ms.IsEmpty sepNone
(!- " with" +> indent +> genMemberDefnList { astContext with IsInterface = false } ms +> unindent)
and genSigException astContext (SigExceptionDef(ats, px, ao, uc, ms)) =
genExceptionBody astContext ats px ao uc
+> colPre sepNln sepNln ms (genMemberSig astContext)
and genUnionCase astContext (UnionCase(ats, px, _, s, UnionCaseType fs)) =
genPreXmlDoc px
+> ifElse astContext.HasVerticalBar sepBar sepNone
+> genOnelinerAttributes astContext ats -- s
+> colPre wordOf sepStar fs (genField { astContext with IsUnionField = true } "")
and genEnumCase astContext (EnumCase(ats, px, _, c)) =
genPreXmlDoc px
+> ifElse astContext.HasVerticalBar sepBar sepNone
+> genOnelinerAttributes astContext ats +> genConst c
and genField astContext prefix (Field(ats, px, ao, isStatic, isMutable, t, so)) =
// Being protective on union case declaration
let t = genType astContext astContext.IsUnionField t
genPreXmlDoc px
+> genAttributes astContext ats +> ifElse isStatic (!- "static ") sepNone -- prefix
+> ifElse isMutable (!- "mutable ") sepNone +> opt sepSpace ao genAccess
+> opt sepColon so (!-) +> t
and genType astContext outerBracket t =
let rec loop = function
| THashConstraint t -> !- "#" +> loop t
| TMeasurePower(t, n) -> loop t -- "^" +> str n
| TMeasureDivide(t1, t2) -> loop t1 -- " / " +> loop t2
| TStaticConstant(c) -> genConst c
| TStaticConstantExpr(e) -> genExpr astContext e
| TStaticConstantNamed(t1, t2) -> loop t1 -- "=" +> loop t2
| TArray(t, n) -> loop t -- " [" +> rep (n - 1) (!- ",") -- "]"
| TAnon -> sepWild
| TVar tp -> genTypar astContext tp
// Drop bracket around tuples before an arrow
| TFun(TTuple ts, t) -> sepOpenT +> loopTTupleList ts +> sepArrow +> loop t +> sepCloseT
// Do similar for tuples after an arrow
| TFun(t, TTuple ts) -> sepOpenT +> loop t +> sepArrow +> loopTTupleList ts +> sepCloseT
| TFuns ts -> sepOpenT +> col sepArrow ts loop +> sepCloseT
| TApp(t, ts, isPostfix) ->
let postForm =
match ts with
| [] -> loop t
| [t'] -> loop t' +> sepSpace +> loop t
| ts -> sepOpenT +> col sepComma ts loop +> sepCloseT +> loop t
ifElse isPostfix postForm (loop t +> genPrefixTypes astContext ts)
| TLongIdentApp(t, s, ts) -> loop t -- sprintf ".%s" s +> genPrefixTypes astContext ts
| TTuple ts -> sepOpenT +> loopTTupleList ts +> sepCloseT
| TWithGlobalConstraints(TFuns ts, tcs) -> col sepArrow ts loop +> colPre (!- " when ") wordAnd tcs (genTypeConstraint astContext)
| TWithGlobalConstraints(t, tcs) -> loop t +> colPre (!- " when ") wordAnd tcs (genTypeConstraint astContext)
| TLongIdent s -> !- s
| t -> failwithf "Unexpected type: %O" t
and loopTTupleList = function
| [] -> sepNone
| [(_, t)] -> loop t
| (isDivide, t) :: ts ->
loop t -- (if isDivide then " / " else " * ") +> loopTTupleList ts
match t with
| TFun(TTuple ts, t) ->
ifElse outerBracket (sepOpenT +> loopTTupleList ts +> sepArrow +> loop t +> sepCloseT)
(loopTTupleList ts +> sepArrow +> loop t)
| TFuns ts -> ifElse outerBracket (sepOpenT +> col sepArrow ts loop +> sepCloseT) (col sepArrow ts loop)
| TTuple ts -> ifElse outerBracket (sepOpenT +> loopTTupleList ts +> sepCloseT) (loopTTupleList ts)
| _ -> loop t
and genPrefixTypes astContext = function
| [] -> sepNone
// Some patterns without spaces could cause a parsing error
| (TStaticConstant _ | TStaticConstantExpr _ | TStaticConstantNamed _ | TVar(Typar(_, true)) as t)::ts ->
!- "< " +> col sepComma (t::ts) (genType astContext false) -- " >"
| ts -> !- "<" +> col sepComma ts (genType astContext false) -- ">"
and genTypeList astContext = function
| [] -> sepNone
| (t, [ArgInfo(attribs, so, isOpt)])::ts ->
let hasBracket = not ts.IsEmpty
let gt =
match t with
| TTuple _ ->
opt sepColonFixed so (if isOpt then (sprintf "?%s" >> (!-)) else (!-))
+> genType astContext hasBracket t
| TFun _ ->
// Fun is grouped by brackets inside 'genType astContext true t'
opt sepColonFixed so (if isOpt then (sprintf "?%s" >> (!-)) else (!-))
+> genType astContext true t
| _ ->
opt sepColonFixed so (!-) +> genType astContext false t
genOnelinerAttributes astContext attribs
+> gt +> ifElse ts.IsEmpty sepNone (autoNln (sepArrow +> genTypeList astContext ts))
| (TTuple ts', argInfo)::ts ->
// The '/' separator shouldn't appear here
let hasBracket = not ts.IsEmpty
let gt = col sepStar (Seq.zip argInfo (Seq.map snd ts'))
(fun (ArgInfo(attribs, so, isOpt), t) ->
genOnelinerAttributes astContext attribs
+> opt sepColonFixed so (if isOpt then (sprintf "?%s" >> (!-)) else (!-))
+> genType astContext hasBracket t)
gt +> ifElse ts.IsEmpty sepNone (autoNln (sepArrow +> genTypeList astContext ts))
| (t, _)::ts ->
let gt = genType astContext false t
gt +> ifElse ts.IsEmpty sepNone (autoNln (sepArrow +> genTypeList astContext ts))
and genTypar astContext (Typar(s, isHead)) =
ifElse isHead (ifElse astContext.IsFirstTypeParam (!- " ^") (!- "^")) (!-"'") -- s
and genTypeConstraint astContext = function
| TyparSingle(kind, tp) -> genTypar astContext tp +> sepColon -- sprintf "%O" kind
| TyparDefaultsToType(tp, t) -> !- "default " +> genTypar astContext tp +> sepColon +> genType astContext false t
| TyparSubtypeOfType(tp, t) -> genTypar astContext tp -- " :> " +> genType astContext false t
| TyparSupportsMember(tps, msg) ->
genTyparList astContext tps +> sepColon +> sepOpenT +> genMemberSig astContext msg +> sepCloseT
| TyparIsEnum(tp, ts) ->
genTypar astContext tp +> sepColon -- "enum<" +> col sepComma ts (genType astContext false) -- ">"
| TyparIsDelegate(tp, ts) ->
genTypar astContext tp +> sepColon -- "delegate<" +> col sepComma ts (genType astContext false) -- ">"
and genInterfaceImpl astContext (InterfaceImpl(t, bs)) =
match bs with
| [] -> !- "interface " +> genType astContext false t
| bs ->
!- "interface " +> genType astContext false t -- " with"
+> indent +> sepNln +> genMemberBindingList { astContext with IsInterface = true } bs +> unindent
and genClause astContext hasBar (Clause(p, e, eo)) =
ifElse hasBar sepBar sepNone +> genPat astContext p
+> optPre (!- " when ") sepNone eo (genExpr astContext) +> sepArrow +> preserveBreakNln astContext e
/// Each multiline member definition has a pre and post new line.
and genMemberDefnList astContext = function
| [x] -> sepNln +> genMemberDefn astContext x
| MDOpenL(xs, ys) ->
fun ctx ->
let xs = sortAndDeduplicate ((|MDOpen|_|) >> Option.get) xs ctx
match ys with
| [] -> col sepNln xs (genMemberDefn astContext) ctx
| _ -> (col sepNln xs (genMemberDefn astContext) +> rep 2 sepNln +> genMemberDefnList astContext ys) ctx
| MultilineMemberDefnL(xs, []) ->
rep 2 sepNln
+> col (rep 2 sepNln) xs (function
| Pair(x1, x2) -> genPropertyWithGetSet astContext (x1, x2)
| Single x -> genMemberDefn astContext x)
| MultilineMemberDefnL(xs, ys) ->
rep 2 sepNln
+> col (rep 2 sepNln) xs (function
| Pair(x1, x2) -> genPropertyWithGetSet astContext (x1, x2)
| Single x -> genMemberDefn astContext x)
+> sepNln +> genMemberDefnList astContext ys
| OneLinerMemberDefnL(xs, ys) ->
sepNln +> col sepNln xs (genMemberDefn astContext) +> genMemberDefnList astContext ys
| _ -> sepNone
and genMemberDefn astContext = function
| MDNestedType _ -> invalidArg "md" "This is not implemented in F# compiler"
| MDOpen(s) -> !- (sprintf "open %s" s)
// What is the role of so
| MDImplicitInherit(t, e, _) -> !- "inherit " +> genType astContext false t +> genExpr astContext e
| MDInherit(t, _) -> !- "inherit " +> genType astContext false t
| MDValField f -> genField astContext "val " f
| MDImplicitCtor(ats, ao, ps, so) ->
// In implicit constructor, attributes should come even before access qualifiers
ifElse ats.IsEmpty sepNone (sepSpace +> genOnelinerAttributes astContext ats)
+> optPre sepSpace sepSpace ao genAccess +> sepOpenT
+> col sepComma ps (genSimplePat astContext) +> sepCloseT