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Converted repeat .. until .. -> do .. while .. od

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Dmitry Boulytchev 2021-01-31 19:27:00 +03:00
parent 297139c72a
commit 919cda5556
7 changed files with 17 additions and 18 deletions
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13
src/Language.ml
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@ -377,7 +377,7 @@ module Expr =
(* empty statement *) | Skip
(* conditional *) | If of t * t * t
(* loop with a pre-condition *) | While of t * t
(* loop with a post-condition *) | Repeat of t * t
(* loop with a post-condition *) | DoWhile of t * t
(* pattern-matching *) | Case of t * (Pattern.t * t) list * Loc.t * atr
(* ignore a value *) | Ignore of t
(* unit value *) | Unit
@ -537,8 +537,8 @@ module Expr =
eval conf k (schedule_list [e; Control (fun (st, i, o, e::vs) -> (if Value.to_int e <> 0 then s1 else s2), (st, i, o, vs))])
| While (e, s) ->
eval conf k (schedule_list [e; Control (fun (st, i, o, e::vs) -> (if Value.to_int e <> 0 then seq s expr else Skip), (st, i, o, vs))])
| Repeat (s, e) ->
eval conf (seq (While (Binop ("==", e, Const 0), s)) k) s
| DoWhile (s, e) ->
eval conf (seq (While (e, s)) k) s
| Case (e, bs, _, _)->
let rec branch ((st, i, o, v::vs) as conf) = function
| [] -> failwith (Printf.sprintf "Pattern matching failed: no branch is selected while matching %s\n" (show(Value.t) (fun _ -> "<expr>") (fun _ -> "<state>") v))
@ -768,7 +768,7 @@ module Expr =
| _ -> Seq (i, While (c, Seq (b, s))))
}
| %"repeat" s:scope[infix][Void] %"until" e:basic[infix][Val] => {isVoid atr} => {
| %"do" s:scope[infix][Void] %"while" e:parse[infix][Val] => {isVoid atr} => %"od" {
materialize atr @@
match s with
| Scope (defs, s) ->
@ -781,8 +781,8 @@ module Expr =
defs
([], s)
in
Scope (defs, Repeat (s, e))
| _ -> Repeat (s, e)
Scope (defs, DoWhile (s, e))
| _ -> DoWhile (s, e)
}
| %"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)]))}
@ -1265,7 +1265,6 @@ let run_parser cmd =
"skip";
"if"; "then"; "else"; "elif"; "fi";
"while"; "do"; "od";
"repeat"; "until";
"for";
"fun"; "local"; "public"; "external"; "import";
"length";