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https://github.com/ProgramSnail/Lama.git
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Good old compiler-workout
This commit is contained in:
kverty
parent
686e3ff9d7
commit
c46fc45802
3 changed files with 254 additions and 195 deletions
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@ -76,4 +76,41 @@ fun f2 (p1, p2, p3) local p4, p5 {
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return p4
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}
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fun f3 (p1, p2, p3) local p4, p5 {
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p4 := {};
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while (1) do
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case p2[p3[0]] of
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A (a, b) ->
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p5 := foo(p3, p2, a);
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p4 := p5 : p4;
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foo(p3, b, p5)
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|B (a, b) ->
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case P(foo(p3, p2, a), foo(p3, p2, b)) of
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P (L (a), L (b)) -> p5 := L (a + b)
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|P (a, b) -> p5 := foo(p3, a, b)
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esac;
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p4 := p5 : p4;
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foo(p3, b, p5)
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|C (a, b) ->
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case P(foo(p3, p2, a), foo(p3, p2, b)) of
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P (L (a), L (b)) -> p5 := L (a - b)
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|P (a, b) -> p5 := foo(p3, a, b)
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esac;
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p4 := p5 : p4;
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foo(p3, b, p5)
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|D (a) ->
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p5 := foo(p3, p2, a);
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p4 := p5 : p4;
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case p3[1][7] of
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L (m) -> p3[1][7] := L (m + 1);
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p3[2][m + 1] := p5
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esac
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|E ->
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return p4
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|a -> skip
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esac
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od;
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return p4
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}
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write(7)
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@ -30,7 +30,7 @@ let parse infile =
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] s
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end
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)
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(ostap (!(Language.parse (Language.Expr.defaultInfix ())) -EOF))
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(ostap (!(Language.parse Language.Infix.default) -EOF))
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let main =
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try
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404
src/Language.ml
404
src/Language.ml
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@ -260,13 +260,13 @@ module Expr =
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(* intrinsic (for evaluation) *) | Intrinsic of (config -> config)
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(* control (for control flow) *) | Control of (config -> t * config)
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(* Reff : parsed expression should return value Reff (look for ":=");
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Val : -//- returns simple value;
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Void : parsed expression should not return any value; *)
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type atr = Reff | Void | Val
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let notRef x = match x with Reff -> false | _ -> true
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let isVoid x = match x with Void -> true | _ -> false
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let isValue x = match x with Void -> false | _ -> true (* functions for handling atribute *)
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(* Available binary operators:
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!! --- disjunction
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&& --- conjunction
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==, !=, <=, <, >=, > --- comparisons
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+, - --- addition, subtraction
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*, /, % --- multiplication, division, reminder
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*)
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(* Update state *)
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let update st x v =
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@ -400,21 +400,6 @@ module Expr =
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in
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eval env conf Skip (schedule_list [e; Intrinsic (fun conf -> branch conf bs)])
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(* places ignore if expression should be void *)
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let ignore atr expr = if isVoid atr then Ignore expr else expr
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(* semantics for default set of infixes *)
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(* Available binary operators:
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!! --- disjunction
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&& --- conjunction
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==, !=, <=, <, >=, > --- comparisons
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+, - --- addition, subtraction
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*, /, % --- multiplication, division, reminder
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*)
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(* semantics for infixes creaed in runtime *)
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let sem s = (fun x atr y -> ignore atr (Call (Var s, [x; y]))), (fun _ -> Val, Val)
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(* Expression parser. You can use the following terminals:
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LIDENT --- a non-empty identifier a-z[a-zA-Z0-9_]* as a string
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@ -422,16 +407,165 @@ module Expr =
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DECIMAL --- a decimal constant [0-9]+ as a string
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*)
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let default =
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(* Propagates *)
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let rec propagate_ref = function
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| Var x -> Ref x
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| Elem (e, i) -> ElemRef (e, i)
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| Seq (s1, s2) -> Seq (s1, propagate_ref s2)
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| If (e, t1, t2) -> If (e, propagate_ref t1, propagate_ref t2)
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| Case (e, bs) -> Case (e, List.map (fun (p, e) -> p, propagate_ref e) bs)
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| _ -> raise (Semantic_error "not a destination")
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(* Balance values *)
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let rec balance_value = function
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| Array es -> Array (List.map balance_value es)
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| Sexp (s, es) -> Sexp (s, List.map balance_value es)
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| Binop (o, l, r) -> Binop (o, balance_value l, balance_value r)
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| Elem (b, i) -> Elem (balance_value b, balance_value i)
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| ElemRef (b, i) -> ElemRef (balance_value b, balance_value i)
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| Length x -> Length (balance_value x)
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| StringVal x -> StringVal (balance_value x)
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| Call (f, es) -> Call (balance_value f, List.map balance_value es)
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| Assign (d, s) -> Assign (balance_value d, balance_value s)
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| Seq (l, r) -> Seq (balance_void l, balance_value r)
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| If (c, t, e) -> If (balance_value c, balance_value t, balance_value e)
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| Case (e, ps) -> Case (balance_value e, List.map (fun (p, e) -> p, balance_value e) ps)
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| Return _
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| While _
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| Repeat _
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| Skip -> raise (Semantic_error "missing value")
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| e -> e
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and balance_void = function
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| If (c, t, e) -> If (balance_value c, balance_void t, balance_void e)
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| Seq (l, r) -> Seq (balance_void l, balance_void r)
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| Case (e, ps) -> Case (balance_value e, List.map (fun (p, e) -> p, balance_void e) ps)
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| While (e, s) -> While (balance_value e, balance_void s)
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| Repeat (s, e) -> Repeat (balance_void s, balance_value e)
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| Return (Some e) -> Return (Some (balance_value e))
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| Return None -> Return None
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| Skip -> Skip
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| e -> Ignore (balance_value e)
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(* ======= *)
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let left f c x y = f (c x) y
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let right f c x y = c (f x y)
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let expr f ops opnd =
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let ops =
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Array.map
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(fun (assoc, list) ->
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let g = match assoc with `Lefta | `Nona -> left | `Righta -> right in
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assoc = `Nona, altl (List.map (fun (oper, sema) -> ostap (!(oper) {g sema})) list)
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)
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ops
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in
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let n = Array.length ops in
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let op i = snd ops.(i) in
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let nona i = fst ops.(i) in
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let id x = x in
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let ostap (
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inner[l][c]: f[ostap (
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{n = l } => x:opnd {c x}
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| {n > l && not (nona l)} => x:inner[l+1][id] b:(-o:op[l] inner[l][o c x])? {
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match b with None -> c x | Some x -> x
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}
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| {n > l && nona l} => x:inner[l+1][id] b:(op[l] inner[l+1][id])? {
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c (match b with None -> x | Some (o, y) -> o id x y)
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})]
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)
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in
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ostap (inner[0][id])
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(* ======= *)
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ostap (
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parse[infix]: h:basic[infix] t:(-";" parse[infix])? {match t with None -> h | Some t -> Seq (h, t)};
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basic[infix]:
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!(expr
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(fun x -> x)
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(Array.map (fun (a, l) -> a, List.map (fun (s, f) -> ostap (- $(s)), f) l) infix)
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(primary infix));
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primary[infix]:
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b:base[infix] is:(-"[" i:parse[infix] -"]" {`Elem i} | -"." (%"length" {`Len} | %"string" {`Str} | f:LIDENT {`Post f})) * {
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List.fold_left
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(fun b ->
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function
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| `Elem i -> Elem (b, i)
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| `Len -> Length b
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| `Str -> StringVal b
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| `Post f -> Call (Var f, [b])
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)
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b
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is
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};
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base[infix]:
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n:DECIMAL {Const n}
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| s:STRING {String (unquote s)}
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| c:CHAR {Const (Char.code c)}
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| "[" es:!(Util.list0)[parse infix] "]" {Array es}
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| "{" es:!(Util.list0)[parse infix] "}" {match es with
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| [] -> Const 0
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| _ -> List.fold_right (fun x acc -> Sexp ("cons", [x; acc])) es (Const 0)
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}
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| t:UIDENT args:(-"(" !(Util.list)[parse infix] -")")? {Sexp (t, match args with None -> [] | Some args -> args)}
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| x:LIDENT s:("(" args:!(Util.list0)[parse infix] ")" {Call (Var x, args)} | empty {Var x}) {s}
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| %"skip" {Skip}
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| %"if" e:!(parse infix)
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%"then" the:parse[infix]
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elif:(%"elif" parse[infix] %"then" parse[infix])*
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els:(%"else" parse[infix])?
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%"fi" {
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If (e, the,
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List.fold_right
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(fun (e, t) elif -> If (e, t, elif))
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elif
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(match els with None -> Skip | Some s -> s)
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)
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}
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| %"while" e:parse[infix] %"do" s:parse[infix] %"od" {While (e, s)}
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| %"for" i:parse[infix] "," c:parse[infix] "," s:parse[infix] %"do" b:parse[infix] %"od" {
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Seq (i, While (c, Seq (b, s)))
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}
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| %"repeat" s:parse[infix] %"until" e:basic[infix] {Repeat (s, e)}
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| %"return" e:basic[infix]? {Return e}
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| %"case" e:parse[infix] %"of" bs:!(Util.listBy)[ostap ("|")][ostap (!(Pattern.parse) -"->" parse[infix])] %"esac" {Case (e, bs)}
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| -"(" parse[infix] -")"
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)
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end
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(* Infix helpers *)
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module Infix =
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struct
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type t = ([`Lefta | `Righta | `Nona] * (string * (Expr.t -> Expr.t -> Expr.t)) list) array
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let name infix =
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let b = Buffer.create 64 in
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Buffer.add_string b "__Infix_";
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Seq.iter (fun c -> Buffer.add_string b (string_of_int @@ Char.code c)) @@ String.to_seq infix;
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Buffer.contents b
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let default : t =
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Array.map (fun (a, s) ->
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a,
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List.map (fun s -> s,
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(fun x atr y -> ignore atr (
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(fun x y ->
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match s with
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| ":" -> Sexp ("cons", [x; y])
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| "++" -> Call (Var "strcat", [x; y])
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| ":=" -> Assign (x, y)
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| _ -> Binop (s, x, y))
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| ":" -> Expr.Sexp ("cons", [x; y])
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| "++" -> Expr.Call (Var "strcat", [x; y])
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| ":=" -> Expr.Assign (Expr.propagate_ref x, y)
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| _ -> Expr.Binop (s, x, y)
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)
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) s
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)
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@ -445,167 +579,55 @@ module Expr =
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`Lefta , ["*" ; "/"; "%"];
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|]
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let sem_init s = (fun x atr y ->
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ignore atr (
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match s with
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| ":" -> Sexp ("cons", [x; y])
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| "++" -> Call (Var "strcat", [x; y])
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| ":=" -> Assign (x, y)
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| _ -> Binop (s, x, y)
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)), (fun _ -> (if s = ":=" then Reff else Val), Val)
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exception Break of [`Ok of t | `Fail of string]
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let defaultInfix : unit -> (t, atr, 'm, 'stream, 'b, 'c) Util.Infix.t = fun () ->
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let infix = fst (Array.fold_left
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(fun (infix, prev) (a, s) ->
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let fstOp = List.hd s in
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let newInfix = match Util.Infix.after (0, 0) prev fstOp a (sem_init fstOp) infix with `Ok t -> t in
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(List.fold_right (fun s infix -> match Util.Infix.at (0, 0) fstOp s (sem_init s) infix with `Ok t -> t) s newInfix, fstOp)
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let find_op infix op cb ce =
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try
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Array.iteri (fun i (_, l) -> if List.exists (fun (s, _) -> s = op) l then raise (Break (cb i))) infix;
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ce ()
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with Break x -> x
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let no_op op coord = `Fail (Printf.sprintf "infix ``%s'' not found in the scope at %s" op (Msg.Coord.toString coord))
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let sem name x y = Expr.Call (Var name, [x; y])
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let at coord op newp name infix =
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find_op infix op
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(fun i ->
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`Ok (Array.init (Array.length infix)
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(fun j ->
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if j = i
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then let (a, l) = infix.(i) in (a, (newp, sem name) :: l)
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else infix.(j)
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))
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)
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((Util.Infix.singleton `Righta ":=" (sem_init ":=")), ":=")
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[|
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`Righta, [":"];
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`Lefta , ["!!"];
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`Lefta , ["&&"];
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`Lefta , ["=="; "!="; "<="; "<"; ">="; ">"];
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`Lefta , ["++"; "+" ; "-"];
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`Lefta , ["*" ; "/"; "%"];
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|]
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) in Util.Infix.setArr infix default
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(fun _ -> no_op op coord)
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let left f c x a y = f (c x) a y
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let right f c x a y = c (f x a y)
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let expr f infix opnd atr =
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let default =
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Array.map (fun (a, s) ->
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let g = match a with `Lefta | `Nona -> left | `Righta -> right in
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let l = List.map (fun s -> s,
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((fun x atr y -> ignore atr (
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match s with
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| ":" -> Sexp ("cons", [x; y])
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| "++" -> Call (Var "strcat", [x; y])
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| ":=" -> Assign (x, y)
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| _ -> Binop (s, x, y))
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), (fun _ -> (if s = ":=" then Reff else Val), Val))
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) s in
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a,
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(snd (snd (List.hd l)),
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(altl (List.map (fun (oper, (sema, _)) -> ostap (- $(oper) {g sema})) l),
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l))
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let before coord op newp ass name infix =
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find_op infix op
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(fun i ->
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`Ok (Array.init (1 + Array.length infix)
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(fun j ->
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if j < i
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then infix.(j)
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else if j = i then (ass, [newp, sem name])
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else infix.(j-1)
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))
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)
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[|
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`Righta, [":="];
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`Righta, [":"];
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`Lefta , ["!!"];
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`Lefta , ["&&"];
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`Nona , ["=="; "!="; "<="; "<"; ">="; ">"];
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`Lefta , ["++"; "+" ; "-"];
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`Lefta , ["*" ; "/"; "%"];
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|]
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in
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let ops = Util.Infix.createArray infix in
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if Array.length ops != Array.length default then failwith (Printf.sprintf "I said so: %d %s" (Array.length ops) (Array.fold_left (fun s (_, (_, (_, l))) -> s ^ (fst (List.hd l))) "" ops));
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let atrr i atr = snd (fst (snd ops.(i)) atr) in
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let atrl i atr = fst (fst (snd ops.(i)) atr) in
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let n = Array.length ops in
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let op i = fst (snd (snd ops.(i))) in
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let nona i = fst ops.(i) = `Nona in
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let id x = x in
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let ostap (
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inner[l][c][atr]: f[ostap (
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{n = l } => x:opnd[atr] {c x}
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| {n > l && not (nona l)} => (-x:inner[l+1][id][atrl l atr] -o:op[l] y:inner[l][o c x atr][atrr l atr] |
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x:inner[l+1][id][atr] {c x})
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| {n > l && nona l} => (x:inner[l+1][id][atrl l atr] o:op[l] y:inner[l+1][id][atrr l atr] {c (o id x atr y)} |
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x:inner[l+1][id][atr] {c x})
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)]
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)
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in
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ostap (inner[0][id][atr])
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ostap (
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parse[infix][atr]: h:basic[infix][Void] -";" t:parse[infix][atr] {Seq (h, t)}
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| basic[infix][atr];
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basic[infix][atr]: !(expr (fun x -> x) (infix) (primary infix) atr);
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primary[infix][atr]:
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b:base[infix][Val] is:(-"[" i:parse[infix][Val] -"]" {`Elem i} | -"." (%"length" {`Len} | %"string" {`Str} | f:LIDENT {`Post f}))+
|
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=> {match (List.hd (List.rev is)), atr with
|
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| `Elem i, Reff -> true
|
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| _, Reff -> false
|
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| _, _ -> true} =>
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{
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let lastElem = List.hd (List.rev is) in
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let is = List.rev (List.tl (List.rev is)) in
|
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let b =
|
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List.fold_left
|
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(fun b ->
|
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function
|
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| `Elem i -> Elem (b, i)
|
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| `Len -> Length b
|
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| `Str -> StringVal b
|
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| `Post f -> Call (Var f, [b])
|
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)
|
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b
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is
|
||||
in
|
||||
let res = match lastElem, atr with
|
||||
| `Elem i, Reff -> ElemRef (b, i)
|
||||
| `Elem i, _ -> Elem (b, i)
|
||||
| `Len, _ -> Length b
|
||||
| `Str, _ -> StringVal b
|
||||
| `Post f, _ -> Call (Var f, [b])
|
||||
in
|
||||
ignore atr res
|
||||
}
|
||||
| base[infix][atr];
|
||||
base[infix][atr]:
|
||||
n:DECIMAL => {notRef atr} => {ignore atr (Const n)}
|
||||
| s:STRING => {notRef atr} => {ignore atr (String (unquote s))}
|
||||
| c:CHAR => {notRef atr} => {ignore atr (Const (Char.code c))}
|
||||
| "[" es:!(Util.list0)[parse infix Val] "]" => {notRef atr} => {ignore atr (Array es)}
|
||||
| "{" es:!(Util.list0)[parse infix Val] "}" => {notRef atr} => {ignore atr (match es with
|
||||
| [] -> Const 0
|
||||
| _ -> List.fold_right (fun x acc -> Sexp ("cons", [x; acc])) es (Const 0))
|
||||
}
|
||||
| t:UIDENT args:(-"(" !(Util.list)[parse infix Val] -")")? => {notRef atr} => {ignore atr (Sexp (t, match args with
|
||||
| None -> []
|
||||
| Some args -> args))
|
||||
}
|
||||
| x:LIDENT s:( "(" args:!(Util.list0)[parse infix Val] ")" => {notRef atr} => {Call (Var x, args)}
|
||||
| empty {if notRef atr then Var x else Ref x}) {ignore atr s}
|
||||
|
||||
| {isVoid atr} => %"skip" {Skip}
|
||||
|
||||
| %"if" e:!(parse infix Val) %"then" the:parse[infix][atr]
|
||||
elif:(%"elif" parse[infix][Val] %"then" parse[infix][atr])*
|
||||
%"else" els:parse[infix][atr] %"fi"
|
||||
{If (e, the, List.fold_right (fun (e, t) elif -> If (e, t, elif)) elif els)}
|
||||
| %"if" e:!(parse infix Val) %"then" the:parse[infix][Void]
|
||||
elif:(%"elif" parse[infix][Val] %"then" parse[infix][atr])*
|
||||
=> {isVoid atr} => %"fi"
|
||||
{If (e, the, List.fold_right (fun (e, t) elif -> If (e, t, elif)) elif Skip)}
|
||||
|
||||
| %"while" e:parse[infix][Val] %"do" s:parse[infix][Void]
|
||||
=> {isVoid atr} => %"od" {While (e, s)}
|
||||
|
||||
| %"for" i:parse[infix][Void] "," c:parse[infix][Val] "," s:parse[infix][Void] %"do" b:parse[infix][Void] => {isVoid atr} => %"od"
|
||||
{Seq (i, While (c, Seq (b, s)))}
|
||||
|
||||
| %"repeat" s:parse[infix][Void] %"until" e:basic[infix][Val]
|
||||
=> {isVoid atr} => {Repeat (s, e)}
|
||||
| %"return" e:basic[infix][Val]? => {isVoid atr} => {Return e}
|
||||
|
||||
| %"case" e:parse[infix][Val] %"of" bs:!(Util.listBy1)[ostap ("|")][ostap (!(Pattern.parse) -"->" parse[infix][atr])] %"esac"
|
||||
{Case (e, bs)}
|
||||
| %"case" e:parse[infix][Val] %"of" bs:(!(Pattern.parse) -"->" parse[infix][Void]) => {isVoid atr} => %"esac"
|
||||
{Case (e, [bs])}
|
||||
|
||||
| -"(" parse[infix][atr] -")"
|
||||
(fun _ -> no_op op coord)
|
||||
|
||||
let after coord op newp ass name infix =
|
||||
find_op infix op
|
||||
(fun i ->
|
||||
`Ok (Array.init (1 + Array.length infix)
|
||||
(fun j ->
|
||||
if j <= i
|
||||
then infix.(j)
|
||||
else if j = i+1 then (ass, [newp, sem name])
|
||||
else infix.(j-1)
|
||||
))
|
||||
)
|
||||
(fun _ -> no_op op coord)
|
||||
|
||||
end
|
||||
|
||||
|
|
@ -619,23 +641,23 @@ module Definition =
|
|||
ostap (
|
||||
arg : LIDENT;
|
||||
position[ass][coord][newp]:
|
||||
%"at" s:STRING {Util.Infix.at coord (unquote s) newp}
|
||||
| f:(%"before" {Util.Infix.before} | %"after" {Util.Infix.after}) s:STRING {f coord (unquote s) newp ass};
|
||||
%"at" s:STRING {Infix.at coord (unquote s) newp}
|
||||
| f:(%"before" {Infix.before} | %"after" {Infix.after}) s:STRING {f coord (unquote s) newp ass};
|
||||
head[infix]:
|
||||
%"fun" name:LIDENT {name, infix}
|
||||
| ass:(%"infix" {`Nona} | %"infixl" {`Lefta} | %"infixr" {`Righta})
|
||||
l:$ op:(s:STRING {unquote s})
|
||||
md:position[ass][l#coord][op] {
|
||||
let name = Util.Infix.name op in
|
||||
match md (Expr.sem name) infix with
|
||||
let name = Infix.name op in
|
||||
match md name infix with
|
||||
| `Ok infix' -> name, infix'
|
||||
| `Fail msg -> raise (Semantic_error msg)
|
||||
};
|
||||
parse[infix]:
|
||||
<(name, infix')> : head[infix] "(" args:!(Util.list0 arg) ")"
|
||||
locs:(%"local" !(Util.list arg))?
|
||||
"{" body:!(Expr.parse infix' Void) "}" {
|
||||
(name, (args, (match locs with None -> [] | Some l -> l), body)), infix'
|
||||
"{" body:!(Expr.parse infix') "}" {
|
||||
(name, (args, (match locs with None -> [] | Some l -> l), Expr.balance_void body)), infix'
|
||||
}
|
||||
)
|
||||
|
||||
|
|
@ -674,7 +696,7 @@ let eval (defs, body) i =
|
|||
|
||||
(* Top-level parser *)
|
||||
ostap (
|
||||
parse[infix]: <(defs, infix')> : definitions[infix] body:!(Expr.parse (infix') Void) {defs, body};
|
||||
parse[infix]: <(defs, infix')> : definitions[infix] body:!(Expr.parse infix') {defs, Expr.balance_void body};
|
||||
definitions[infix]:
|
||||
<(def, infix')> : !(Definition.parse infix) <(defs, infix'')> : definitions[infix'] {def::defs, infix''}
|
||||
| empty {[], infix}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue