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[CUB] A08 Aleksandr Shefer #1460

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[CUB] A08 Aleksandr Shefer #1460

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8c370bc
some
alex28sh May 10, 2024
90ed873
fixes
alex28sh May 11, 2024
9d68e9e
fixes
alex28sh May 22, 2024
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118 changes: 117 additions & 1 deletion src/Expr.lama
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,10 @@ fun addNames (state, names) {
foldl (fun (s, name) {s.addName (name, Val (0))}, state, names)
}

fun addNamesVals (state, names, args) {
foldl (fun (s, [name, arg]) {s.addName (name, arg)}, state, zip(names, args))
}

-- Helper function: adds a function in current scope
fun addFunction (state, name, args, body) {
state.addName (name, Fun (args, body))
Expand All @@ -101,8 +105,120 @@ fun evalList (c, exprs) {
esac
}

fun addDefs (state, defs) {
foldl( fun (s, def) {
case def of
Fun (name, args, body) -> addFunction(s, name, args, body)
| Var (vars) -> addNames(s, vars)
esac
}, state, defs)
}

fun eval (c@[s, w], expr) {
failure ("evalExpr not implemented\n")
case expr of
Skip -> [c, None]
| Ignore(e) -> case eval(c, e) of
[c, _] -> [c, None]
esac
| Const(n) -> [c, n]
| Var(x) -> [c, lookup(s, x)]
| Ref(x) -> [c, Ref(x)]
| Binop(op, l, r) ->
case evalList(c, {l, r}) of
[c, {lRes, rRes}] ->
[c, evalOp(op, lRes, rRes)]
esac
| Seq(l, r) ->
case evalList(c, {l, r}) of
[c, {_, rRes}] -> [c, rRes]
esac
| Read(x) ->
case readWorld(w) of
[res, w] -> [[s <- [x, res], w], None]
esac
| Write(e) ->
case eval(c, e) of
[c@[s, w], res] -> [[s, writeWorld(res, w)], None]
esac
| If(cond, l, r) ->
case eval(c, cond) of
[c, resCond] -> eval(c, if resCond then l else r fi)
esac
| While(cond, body) ->
case eval(c, cond) of
[c, resCond] -> if resCond then eval(c, Seq(body, expr)) else [c, None] fi
esac
| DoWhile(body, cond) ->
case eval(c, body) of
[c, _] -> eval(c, While(cond, body))
esac
| Scope(defs, body) ->
case enterScope(s) of
s ->
case addDefs(s, defs) of
s ->
case eval([s, w], body) of
[[sr, wr], res] ->
[[leaveScope(sr), wr], res]
esac
esac
esac
| Call(name, args) ->
case lookup(s, name) of
Fun (names, body) ->
case evalList(c, args) of
[[s, w], vals] ->
case body of
External ->
case evalBuiltin(name, vals, w) of
[res, w] -> [[s, w], res]
esac
| _ ->
case eval([addNamesVals(enterFunction(s), names, vals), w], body) of
[[sr, wr], res] ->
[[leaveFunction(s, getGlobal(sr)), wr], res]
esac
esac
esac
esac
| Assn(x, e) -> -- ?
case evalList(c, {x, e}) of
[c@[s, w], {l, r}] ->
case l of
ElemRef(a, i) ->
[[s, w], a[i] := r]
| Ref(l) ->
[[s <- [l, r], w], r]
esac
esac
| Set(x, expr) -> eval(c, Assn(Ref(x), expr))
| String(s) ->
[c, s]
| Array (elems) ->
case evalList(c, elems) of
[c, vals] -> [c, listArray(vals)]
esac
| Sexp(name, elems) ->
case evalList(c, elems) of
[c, vals] -> [c, Sexp(name, listArray(vals))]
esac
| Elem(a, i) ->
case evalList(c, {a, i}) of
[c, {a, i}] ->
case a of
Sexp(_, a) -> [c, a[i]]
| _ -> [c, a[i]]
esac
esac
| ElemRef(a, i) ->
case evalList(c, {a, i}) of
[c, {a, i}] ->
case a of
Sexp(_, a) -> [c, ElemRef(a, i)]
| _ -> [c, ElemRef(a, i)]
esac
esac
esac
}


Expand Down
30 changes: 27 additions & 3 deletions src/Parser.lama
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Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,12 @@ fun distributeScope (expr, exprConstructor) {
esac
}

var parseIf = memo $ eta syntax (
expr=exp kThen s1=scopeExpr kElse s2=scopeExpr kFi { fun(a) { If(expr(Val), s1(a), s2(a)) } } |
expr=exp kThen s1=scopeExpr kFi loc=pos { fun(a) { If(expr(Val), s1(a), assertVoid(a, Skip, loc)) } } |
expr=exp kThen s1=scopeExpr kElif s2=parseIf { fun(a) { If(expr(Val), s1(a), s2(a)) } }
);

var primary = memo $ eta syntax (
-- array constant
loc=pos x=inbr[s("["), list0(syntax (e=exp {e(Val)})), s("]")] {fun (a) {assertValue (a, Array (x), loc)}} |
Expand All @@ -131,14 +137,14 @@ var primary = memo $ eta syntax (
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) {
loc=pos 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))
| Some (args) -> assertValue (a, Call (x, args), loc)
esac
}} |

Expand All @@ -147,7 +153,25 @@ var primary = memo $ eta syntax (
None -> {}
| Some (args) -> args
esac), loc)}} |
$(failure ("the rest of primary parsing in not implemented\n"))),
inbr[s("("), scopeExpr, s(")")] | -- +
loc=pos kSkip { fun(a) { assertVoid(a, Skip, loc )} } | -- +
-- loc=pos kRead x=inbr[s("("), lident, s(")")] { fun(a) { assertVoid(a, Read(x), loc) } } |
-- loc=pos kWrite x=inbr[s("("), exp, s(")")] { fun (a) { assertVoid(a, Write(x(Val)), loc) } } |

kIf ifS=parseIf { fun(a) { ifS(a) } } |

loc=pos kWhile cond=exp kDo body=scopeExpr kOd { fun(a) { assertVoid(a, While(cond(Val), body(Void)), loc)} } |
loc=pos kDo body=scopeExpr kWhile cond=exp kOd {
fun(a) {
assertVoid(a, distributeScope(body(Void), fun (sBody) {DoWhile(sBody, cond(Val))}), loc)
}
} |

loc=pos kFor init=scopeExpr s[","] cond=exp s[","] succ=exp kDo body=scopeExpr kOd {
fun(a) {
assertVoid(a, distributeScope(init(Void), fun (sInit) {Seq(sInit, While(cond(Val), Seq(body(Void), succ(Void))))}), loc)
}
} ),
basic = memo $ eta (expr ({[Right, {[s (":="),
fun (l, loc, r) {
fun (a) {assertValue (a, Assn (l (Ref), r (Val)), loc)}
Expand Down
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