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add let-in as experimental sintax sugger

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danyaberezun 2024-03-01 13:48:19 +02:00 • committed by Roman Venediktov
parent 2a76179acb
commit 120eccba66
1 changed files with 15 additions and 6 deletions
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21
src/Language.ml
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@ -655,7 +655,12 @@ module Expr =
let [@ocaml.warning "-26"] makeParser, makeBasicParser, makeScopeParser =
let [@ocaml.warning "-20"] def s = let [@ocaml.warning "-8"] Some def = Obj.magic !defCell in def s in
let ostap (
parse[infix][atr]: h:basic[infix][Void] -";" t:parse[infix][atr] {Seq (h, t)} | basic[infix][atr];
(* parse[infix][atr]: h:basic[infix][Void] -";" t:parse[infix][atr] {Seq (h, t)} | basic[infix][atr]; *)
parse[infix][atr]:
%"let" l:$ pat:(!(Pattern.parse) -"=") e:parse[infix][Val] %"in" body:parse[infix][atr] {Case (e, [(pat, body)], l#coord, atr )}
| h:basic[infix][Void] -";" t:parse[infix][atr] {Seq (h, t)}
| basic[infix][atr];
scope[infix][atr]: <(d, infix')> : def[infix] expr:parse[infix'][atr] {Scope (d, expr)} | {isVoid atr} => <(d, infix')> : def[infix] => {d <> []} => {Scope (d, materialize atr Skip)};
basic[infix][atr]: !(expr (fun x -> x) (Array.map (fun (a, (atr, l)) -> a, (atr, List.map (fun (s, _, f) -> ostap (- $(s)), f) l)) infix) (primary infix) atr);
primary[infix][atr]:
@ -782,6 +787,10 @@ module Expr =
Scope (defs, DoWhile (s, e))
| _ -> DoWhile (s, e)
}
(* Let-in as expression doesn't work due to lack of greed; In case of expressions we need closing "ni" *)
(* | %"let" l:$ pat:!(Pattern.parse) %"be" e:parse[infix][Val] %"in" body:scope[infix][atr] %"ni" {Case (e, [(pat, body)], l#coord, atr)} *)
(* | %"let" l:$ pat:(!(Pattern.parse) -"=") e:parse[infix][Val] %"in" body:scope[infix][atr] {Case (e, [(pat, body)], l#coord, Val )} *)
(* | %"let" l:$ pat:(!(Pattern.parse) -"=") e:parse[infix][Val] %"in" body:parse[infix][atr] {Case (e, [(pat, body)], l#coord, Val )} *)
| %"case" l:$ e:parse[infix][Val] %"of" bs:!(Util.listBy)[ostap ("|")][ostap (!(Pattern.parse) -"->" scope[infix][atr])] %"esac"{Case (e, bs, l#coord, atr)}
| l:$ %"lazy" e:basic[infix][Val] => {notRef atr} :: (not_a_reference l) => {env#add_import "Lazy"; ignore atr (Call (Var "makeLazy", [Lambda ([], e)]))}
| l:$ %"eta" e:basic[infix][Val] => {notRef atr} :: (not_a_reference l) => {let name = env#get_tmp in ignore atr (Lambda ([name], Call (e, [Var name])))}
@ -936,11 +945,11 @@ module Infix =
[|
`Righta, [":="];
`Righta, [":"];
`Lefta , ["!!"];
`Lefta , ["&&"];
`Nona , ["=="; "!="; "<="; "<"; ">="; ">"];
`Lefta , ["+" ; "-"];
`Lefta , ["*" ; "/"; "%"];
`Lefta , ["!!"];
`Lefta , ["&&"];
`Nona , ["=="; "!="; "<="; "<"; ">="; ">"];
`Lefta , ["+" ; "-"];
`Lefta , ["*" ; "/"; "%"];
|]
exception Break of [`Ok of t | `Fail of string]