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HW11 Босов Никита #511

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17 changes: 16 additions & 1 deletion src/Builtins.lama
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Original file line number Diff line number Diff line change
@@ -1,9 +1,24 @@
-- Builtins
import World;
import List;

fun exprToStr(e) {
case e of
Sexp(tag, args) -> if compare(args, {}) then
tag ++ " (" ++ foldl(fun(s, arg) {
if compare(s, "") then s ++ ", " ++ exprToStr(arg)
else exprToStr(arg)
fi
}, "", args) ++ ")"
else tag
fi |
_ -> e.string
esac
}

public fun evalBuiltin (name, args, w) {
case [name, args] of
["stringval", {a}] -> [a.string, w]
["stringval", {a}] -> [exprToStr(a), w]
| ["length" , {a@#array}] -> [a.length, w]
| ["length" , {a@#string}] -> [a.length, w]
| ["read" , {}] -> readWorld (w)
Expand Down
97 changes: 96 additions & 1 deletion src/Expr.lama
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Original file line number Diff line number Diff line change
Expand Up @@ -100,9 +100,104 @@ fun evalList (c, exprs) {
esac
}

fun matchSexp(c@[s, w], val, sexpr) {
case sexpr of
Sexp(setag, sexprs) -> case setag of
"_" -> c |
_ -> case val of
Sexp(vtag, vals) -> if compare(vtag, setag) == 0 && size(vals) == size(sexprs) then
foldl(fun (c, [val, sexpr]) {
case c of
None -> None |
_ -> matchSexp(c, val, sexpr)
esac}, c, zip(vals, sexprs))
else None
fi |
_ -> None
esac
esac |
Var(x) -> [addName(s, x) <- [x, Val(val)], w]
esac
}

(* Assignment *)
fun eval (c@[s, w], expr) {
failure ("evalExpr not implemented\n")
case expr of
Assn (x, e) -> case evalList(c, {x, e}) of
[[s, w], {Ref(x), a}] -> [[s <- [x, Val(a)], w], a] |
[c, {ElemRef(arr, i), a}] -> arr[i] := a;[c, a]
esac |
Skip -> [c, Void] |
If (cond, e1, e2) -> case eval(c, cond) of
[c, val] -> if val then eval(c, e1) else eval(c, e2) fi
esac |
While (cond, body) -> case eval(c, cond) of
[c, val] -> if val then case eval(c, body) of [c, _] -> eval(c, expr) esac
else [c, Void]
fi
esac |
Repeat (body, cond) -> case evalList(c, {body, cond}) of
[c, _:val:_] -> if val then [c, Void] else eval(c, expr) fi
esac |
Seq (e1, e2) -> case evalList(c, {e1, e2}) of [c, _:res:_] -> [c, res] esac |
Var (x) -> [c, case s.lookupVal(x) of Val(v) -> v esac] |
Ref (x) -> [c, Ref(x)] |
Const (val) -> [c, val] |
Binop (op, lhs, rhs) -> case evalList(c, {lhs, rhs}) of
[c, lval:rval:_] -> [c, evalOp(op, lval, rval)]
esac |
Ignore (e) -> [eval(c, e).fst, Void] |
Scope(defs, e) -> case evalList([s.enterScope, w], defs) of
[c, _] -> case eval(c, e) of
[[s, w], val] -> [[s.leaveScope, w], val]
esac
esac |
Local(vars) -> [[s.addNames(vars), w], Void] |
Fun (f, args, body) -> [[s.addFunction(f, args, body), w], Void] |
Call (f, exprs) -> case s.lookupFun(f) of
Fun(args, body) -> case evalList(c, exprs) of
[[s, w], vals] -> case body of
External -> case evalBuiltin(f, vals, w) of
[res, w] -> [[s, w], res]
esac |
_ -> local s2 = foldl(fun (s1, [arg, val]) {
s1.addName(arg, Val(val))
}, s.enterFunction, zip(args, vals));
case eval([s2, w], body) of
[[s2, w], res] -> [[s.leaveFunction(s2.getGlobal), w], res]
esac
esac
esac
esac |
String(str) -> [c, str] |
Array (exprs) -> case evalList(c, exprs) of
[c, vals] -> [c, listArray(vals)]
esac |
Elem(arrExpr, indexExpr) -> case evalList(c, {arrExpr, indexExpr}) of
[c, {arr, index}] -> [c, arr[index]]
esac |
ElemRef(arrExpr, indexExpr) -> case evalList(c, {arrExpr, indexExpr}) of
[c, {arr, index}] -> [c, ElemRef(arr, index)]
esac |
Builtin(f, args) -> case evalList(c, args) of
[[s, w], vals] -> case evalBuiltin(f, vals, w) of
[res, w] -> [[s, w], res]
esac
esac |
Sexp(tag, args) -> case evalList(c, args) of
[c, vals] -> [c, Sexp(tag, vals)]
esac |
Case (x, pats) -> case eval(c, x) of
[c, val] -> case find(fun ([pat, _]) {
compare(matchSexp([enterScope(s), w], val, pat), None)
}, pats) of
None -> failure("Matching failed %s\n", val.string) |
Some([pat, e]) -> case eval(matchSexp([enterScope(s), w], val, pat), e) of
[[s, w], val] -> [[leaveScope(s), w], val]
esac
esac
esac
esac
}
(* End *)

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4 changes: 3 additions & 1 deletion src/Lexer.lama
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Expand Up @@ -70,7 +70,8 @@ public rSkip = createRegexp ("skip\\b", "skip"),
rCase = createRegexp ("case\\b", """case"""),
rOf = createRegexp ("of\\b", """of"""),
rEsac = createRegexp ("esac\\b", """esac"""),
rLength = createRegexp ("length\\b", """length""");
rLength = createRegexp ("length\\b", """length"""),
rString = createRegexp ("string\\b", """string""");

local whiteSpace = token (rWhiteSpace);

Expand All @@ -97,6 +98,7 @@ public kSkip = s (rSkip),
kOf = s (rOf),
kEsac = s (rEsac),
kLength = s (rLength),
kString = s (rString),
decimal = s (rDecimal),
chrlit = syntax (x=s[rChar] {case substring (x, 1, x.length - 2) of
"\\t" -> '\t'
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44 changes: 39 additions & 5 deletions src/Parser.lama
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Expand Up @@ -130,7 +130,38 @@ local primary = memo $ eta syntax (
esac
}} |
(* Assignment *)
$(failure ("the rest of primary parsing in not implemented\n"))),
loc=pos kSkip {fun(a) {assertVoid(a, Skip, loc)}} |
loc=pos kIf cond=exp kThen s1=exp s2=elseBranch {fun (a) {If (cond(Val), s1(a), s2(a))}} |
loc=pos kWhile cond=exp kDo body=scopeExpr kOd {
fun (a) { assertVoid(a, While (cond(Val), body(Void)), loc) }
} |
loc=pos kRepeat body=scopeExpr kUntil cond=inbr[s("("), exp, s(")")] {
fun (a) {
case body(Void) of
Scope(defs, e) -> assertVoid(a, Scope(defs, Repeat (e, cond(Val))), loc)
esac
}
} |
loc=pos kFor init=scopeExpr s[","] cond=exp s[","] step=exp kDo body=scopeExpr kOd {
fun (a) {
case init(Void) of
Scope(defs, e) -> assertVoid(a, Scope(defs, Seq (e, While (cond(Val), Seq (body(Void), step(Void))))), loc)
esac
}
} |
inbr[s("("), exp, s(")")] |
inbr[s("{"), scopeExpr, s("}")] |
loc=pos x=sexpLhs {fun (a) { assertValue (a, Sexp(x, {}), loc)}} |
loc=pos x=uident y=inbr[s("("), list0(syntax (e=exp {e(Val)})), s(")")] {fun (a) {assertValue (a, Sexp(x, y), loc)}} |
loc=pos kCase x=exp kOf pats=list0By[caseBranch, s("|")] kEsac {fun (a) { Case(x(Val), map(fun ([p, e]) {[p(Val), e(a)]}, pats)) }}
),
sexpLhs = memo $ eta syntax (uident|s["_"]),
caseBranch = memo $ eta syntax (loc=pos p=primary s["->"] e=exp {[p, e]}),
elseBranch = memo $ eta syntax (
loc=pos kFi {fun (a) { assertVoid(a, Skip, loc)}} |
-kElse exp -kFi|
kElif cond=exp kThen s1=exp s2=elseBranch {fun (a) {If (cond (Val), s1 (a), s2 (a))}}
),
(* End *)
basic = memo $ eta (expr ({[Right, singleton ([s (":="),
fun (l, loc, r) {
Expand All @@ -143,11 +174,14 @@ local primary = memo $ eta syntax (
[Left , map (binop, {"*", "/", "%"})]
},
postfix)),
postfix = memo $ eta syntax (loc=pos e=primary ps=(i=inbr[s("["), exp, s("]")] {Index (i (Val))} |
-s["."] kLength {Length}
)* {fun (a) {foldl (fun (e, p) {
postfixOp = memo $ eta syntax (i=inbr[s("["), exp, s("]")] {Index (i (Val))} |
-s["."] kLength {Length} |
-s["."] kString {String}
),
postfix = memo $ eta syntax (loc=pos e=primary ps= postfixOp* {fun (a) {foldl (fun (e, p) {
case p of
Length -> fun (a) {assertValue (a, Builtin ("length", singleton (e (Val))), loc)}
| String -> fun (a) {assertValue (a, Builtin ("stringval", singleton (e (Val))), loc)}
| Index (i) ->
fun (a) {
case a of
Expand All @@ -161,7 +195,7 @@ local primary = memo $ eta syntax (
),
scopeExpr = memo $ eta syntax (ds=definition* e=exp? {fun (a) {fun (e) {
case ds of
{} -> e
{} -> Scope({}, e)
| _ -> expandScope (ds, e)
esac
} (case e of
Expand Down
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