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Reach pattern-matching.

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Dmitry Boulytchev 2018-05-02 22:36:27 +03:00
parent 40afee26cc
commit de17bdc3c4
6 changed files with 132 additions and 16 deletions
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22
src/SM.ml
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@ -16,7 +16,8 @@ open Language
(* begins procedure definition *) | BEGIN of string * string list * string list
(* end procedure definition *) | END
(* calls a function/procedure *) | CALL of string * int * bool
(* returns from a function *) | RET of bool with show
(* returns from a function *) | RET of bool
| DROP | DUP | OVER with show
(* The type for the stack machine program *)
type prg = insn list
@ -116,6 +117,25 @@ let compile (defs, p) =
let rec call f args p =
let args_code = List.concat @@ List.map expr args in
args_code @ [CALL (label f, List.length args, p)]
and pattern = function
| Stmt.Pattern.Wildcard -> [DROP; CONST 1]
| Stmt.Pattern.Const n -> [CONST n; BINOP "=="]
| Stmt.Pattern.String s -> [STRING s; CALL ("strcmp", 2, false)]
| Stmt.Pattern.Ident n -> [DROP; CONST 1]
| Stmt.Pattern.Array ps -> [DUP;
CALL ("isArray", 1, false);
OVER;
CALL (".length", 1, false);
CONST (List.length ps);
BINOP "==";
BINOP "&&";
]
| Stmt.Pattern.IsArray -> [CALL ("isArray", 1, false)]
| Stmt.Pattern.IsString -> [CALL ("isString", 1, false)]
| Stmt.Pattern.Sexp (t, ps) -> []
and patterns = function
| [] -> []
| (e, p)::ps -> expr e @ pattern p @ [BINOP "&&"] @ patterns ps
and expr = function
| Expr.Var x -> [LD x]
| Expr.Const n -> [CONST n]