Created
July 20, 2019 22:42
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let baseTyConString b = | |
match b with | |
| TyConNumber -> "Number" | |
| TyConBool -> "Bool" | |
| TyConUnit -> "()" | |
| TyConUserDefined name -> name | |
| _ -> sprintf "%A" b | |
let parens s = sprintf "(%s)" s | |
let rec flattenKindChain k = | |
match k with | |
| KFun (l, r) -> l::(flattenKindChain r) | |
| Star -> [k] | |
let rec kindString k = | |
match flattenKindChain k with | |
| [Star] -> "*" | |
| chain -> List.map (kindString >> parens) chain |> String.concat " -> " | |
let tyVarString (TyVar (name, _)) = sprintf "'%s" name | |
let tyConString (TyCon (baseTyCon, _)) = baseTyConString baseTyCon | |
let flattenTypeAppChain e = | |
let rec flattenTypeAppChain' e accum = | |
match e with | |
| TApExpr (l, r) -> flattenTypeAppChain' l (r::accum) | |
| _ -> e::accum | |
flattenTypeAppChain' e [] | |
let rec tyExprString e = | |
match flattenTypeAppChain e with | |
| [TConExpr (TyCon (TyConList, _)); elementTy] -> | |
sprintf "[%s]" (tyExprString elementTy) | |
| (TConExpr (TyCon (TyConFun, _)))::args -> | |
List.map (tyExprString >> parens) args |> String.concat " -> " | |
| (TConExpr (TyCon (TyConTuple, _)))::args -> | |
List.map tyExprString args |> String.concat ", " |> (sprintf "(%s)") | |
| (TVarExpr v)::args -> | |
(tyVarString v)::(List.map (tyExprString >> parens) args) |> String.concat " " | |
| (TConExpr (TyCon (TyConUserDefined name, _)))::args -> | |
name::(List.map (tyExprString >> parens) args) |> String.concat " " | |
| [TConExpr (TyCon (baseTyCon, _))] -> | |
baseTyConString baseTyCon | |
| _ -> | |
// Use the F# pretty printer for all other cases | |
sprintf "%A" e | |
let schemeString (Forall (tyvars, tau)) = | |
sprintf "∀ %s . %s" (List.map tyVarString tyvars |> String.concat " ") (tyExprString tau) |
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