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[SPBGU] A06 Ilia Bondarenko #1476

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[SPBGU] A06 Ilia Bondarenko #1476

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31 changes: 28 additions & 3 deletions src/Expr.lama
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Original file line number Diff line number Diff line change
Expand Up @@ -94,11 +94,36 @@ fun evalList (c, exprs) {
esac
}

(* Assignment *)
fun eval (c@[s, w], expr) {
failure ("evalExpr not implemented\n")
case expr of
Var (varStr) -> [c, lookup(s, varStr)]
| Assn (x, a) -> case evalList (c, {x, a}) of [[s, w], {Ref (x), a}] -> [[s <- [x, a], w], a] esac
| Seq (q, t) -> case evalList (c, {q, t}) of [c, {q, t}] -> [c, t] esac
| Ref (e) -> [c, Ref(e)]
| Skip -> [c, None]
| Read (varStr) -> case readWorld (w) of [v, w] -> [[s <- [varStr, v], w], None] esac
| Write (expr) -> case eval (c, expr) of [[s, w], v] -> [[s, writeWorld (v, w)], None] esac
| If (iff, a, b) -> case eval(c, iff) of [c, out] -> if out then eval(c, a) else eval(c, b) fi esac
| While (iff, b) -> case eval(c, iff) of [c, out] -> if out then eval(c, Seq(b, While(iff, b))) else [c, {}] fi esac
| DoWhile (stmt, expr) -> eval (c, Seq (stmt, While (expr, stmt)))
| Const (n) -> [c, n]
| Binop (op, l, r) -> case evalList (c, {l, r}) of [c, {l, r}] -> [c, evalOp (op, l, r)] esac
| Scope (d, e) ->
case foldl (fun (s, t) {
case t of
Var (strs) -> addNames (s, strs)
| Fun (varStr, pars, body) -> addFunction (s, varStr, pars, body)
esac
},
s.enterScope, d) of s -> case eval ([s, w], e) of [[s, w], v] -> [[s.leaveScope, w], v] esac
esac
| Call (f, pars) -> case evalList(c, pars) of [[st, w], vals] -> case lookup(st, f) of Fun(ns, body) ->
case foldl(fun(s, [n, v]){addName(s, n, v)}, enterFunction(st), zip(ns, vals)) of scp ->
case eval([scp, w], body) of [[scp, w], res] -> [[leaveFunction(st, getGlobal(scp)), w], res]
esac esac esac esac
| Ignore (e) -> case eval (c, e) of [c, em] -> [c, None] esac
esac
}
(* End *)

-- Evaluates a program with a given input and returns an output
public fun evalExpr (input, expr) {
Expand Down
72 changes: 53 additions & 19 deletions src/Parser.lama
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Expand Up @@ -105,24 +105,47 @@ fun distributeScope (expr, exprConstructor) {
esac
}

var primary = memo $ eta syntax (
-- decimal constant
loc=pos x=decimal {fun (a) {assertValue (a, Const (stringInt (x)), loc)}} |

-- identifier
x=lident args=inbr[s("("), list0(syntax(e=exp {e(Val)})), s(")")]? {fun (a) {
case args of
None -> case a of
Ref -> Ref (x)
| Void -> Ignore (Var (x))
| _ -> Var (x)
esac
| Some (args) -> assertValue (a, Call (x, args))
esac
}} |
(* Assignment *)
$(failure ("the rest of primary parsing in not implemented\n"))),
(* End *)
var primary = memo $ eta syntax (
loc=pos x=decimal { fun (b) {
assertValue (b, Const (stringInt (x)), loc)
}
}
| loc=pos x=lident args=inbr[s("("), list0(syntax(e=exp {e(Val)})), s(")")]? { fun (b) {
case args of
None -> case b of
Ref -> Ref (x)
| Void -> Ignore (Var (x))
| l -> Var (x)
esac
| Some (args) -> assertValue (b, Call (x, args), loc)
esac
} }
| inbr[s("("), scopeExpr, s(")")]
| loc=pos kRead x=inbr[s("("), lident, s(")")] {
fun (b) {
assertVoid (b, Read (x), loc)
}
}
| loc=pos kWrite e=inbr[s("("), exp, s(")")] {
fun (b) {
assertVoid (b, Write (e (Val)), loc)
}
}
| loc=pos kSkip { fun (b) {
assertVoid (b, Skip, loc)}
}
| loc=pos kIf c=exp kThen t=scopeExpr e=anSt { fun (b) {
If (c(Val), t (b), e (b)) } }
| loc=pos kWhile c=exp kDo b=scopeExpr kOd { fun (b) {
assertVoid (b, While (c (Val), b (Void)), loc)} }
| loc=pos kDo b=scopeExpr kWhile c=exp kOd { fun (b) {
assertVoid (b, distributeScope (b (Void), fun (b) {
DoWhile (b, c (Val)) }), loc)
}
}
| loc=pos kFor i=scopeExpr s[","] c=exp s[","] s=exp kDo b=scopeExpr kOd { fun (b) {
assertVoid (b, distributeScope(i (Void), fun (i) {
Seq (i, While (c (Val), Seq (b (Void), s (Void)))) }), loc) } }),
basic = memo $ eta (expr ({[Right, {[s (":="),
fun (l, loc, r) {
fun (a) {assertValue (a, Assn (l (Ref), r (Val)), loc)}
Expand Down Expand Up @@ -152,6 +175,17 @@ var primary = memo $ eta syntax (
}
),
exp = memo $ eta syntax (basic | s1=basic s[";"] s2=exp {fun (a) {Seq (s1 (Void), s2 (a))}});

var anSt = memo $ eta syntax (
kFi { fun (b) {
assertVoid (b, Skip, loc)
}
}
| kElse t=scopeExpr kFi { t }
| kElif c=exp kThen t=scopeExpr e=anSt {
fun (b) {
If (c (Val), t(b), e(b))
}
}
);
-- Public top-level parser
public parse = syntax (s=scopeExpr {s (Void)});
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