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|
(*
* @LANG: ocaml
*)
let id x = x
let fail fmt = Printf.ksprintf failwith fmt
let pr fmt = Printf.ksprintf print_endline fmt
let failed fmt = Printf.ksprintf (fun s -> prerr_endline s; exit 1) fmt
let test' show f x y = if f x <> y then failed "FAILED: test %S" (show x)
let case = ref 0
let test f x y = incr case; if f x <> y then failed "FAILED: case %d" !case
let error f x = match try Some (f x) with _ -> None with Some _ -> failed "FAILED: fail %S" x | None -> ()
(*
// -*-go-*-
//
// Reverse Polish Notation Calculator
// Copyright (c) 2010 J.A. Roberts Tunney
// MIT License
//
// To compile:
//
// ragel -Z -G2 -o rpn.go rpn.rl
// 6g -o rpn.6 rpn.go
// 6l -o rpn rpn.6
// ./rpn
//
// To show a diagram of your state machine:
//
// ragel -V -G2 -p -o rpn.dot rpn.rl
// dot -Tpng -o rpn.png rpn.dot
// chrome rpn.png
//
*)
let _rpn_trans_keys : int array = [|
1; 0; 0; 0; 0; 6; 8; 9; 8; 10; 7; 7; 0; 0; 0; 0; 9; 9; 0; 0; 0; 7; 0 ;
|]
let _rpn_char_class : int array = [|
0; 0; 0; 0; 0; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 0; 1; 1; 1; 1; 1; 1; 1; 1; 1; 2; 3; 1; 4; 1; 5; 6; 6; 6; 6; 6; 6; 6; 6; 6; 6; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 7; 8; 1; 9; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 10; 0 ;
|]
let _rpn_index_offsets : int array = [|
0; 0; 1; 8; 10; 13; 14; 15; 16; 17; 18; 0 ;
|]
let _rpn_indices : int array = [|
0; 2; 1; 1; 1; 1; 1; 3; 4; 5; 6; 1; 7; 8; 9; 10; 11; 12; 0; 1; 13; 14; 15; 16; 17; 18; 0 ;
|]
let _rpn_index_defaults : int array = [|
0; 1; 1; 1; 1; 1; 1; 1; 1; 1; 1; 0 ;
|]
let _rpn_trans_cond_spaces : int array = [|
-1; -1; -1; -1; -1; -1; -1; -1; -1; -1; -1; -1; -1; -1; -1; -1; -1; -1; -1; 0 ;
|]
let _rpn_cond_targs : int array = [|
10; 0; 10; 2; 4; 8; 5; 7; 6; 10; 10; 9; 10; 1; 1; 1; 1; 2; 3; 0 ;
|]
let _rpn_cond_actions : int array = [|
0; 0; 1; 0; 0; 0; 0; 0; 0; 2; 3; 0; 4; 5; 4; 6; 7; 8; 0; 0 ;
|]
let _rpn_nfa_targs : int array = [|
0; 0 ;
|]
let _rpn_nfa_offsets : int array = [|
0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0 ;
|]
let _rpn_nfa_push_actions : int array = [|
0; 0 ;
|]
let _rpn_nfa_pop_trans : int array = [|
0; 0 ;
|]
let rpn_start : int = 10
let rpn_first_final : int = 10
let rpn_error : int = 0
let rpn_en_main : int = 10
let fail fmt = Printf.ksprintf failwith fmt
let rpn data =
let (cs, p, pe) = (ref 0, ref 0, ref (String.length data)) in
let mark = ref 0 in
let st = Stack.create () in
begin
cs := rpn_start;
end;
begin
let _trans : int ref = ref 0 in
let _have : int ref = ref 0 in
let _cont : int ref = ref 1 in
let _keys : int ref = ref 0 in
let _inds : int ref = ref 0 in
while _cont.contents= 1 do
begin
if cs.contents= 0 then
begin
_cont := 0;
end
;_have := 0;
if p.contents= pe.contents then
begin
begin
if _have.contents= 0 then
begin
_cont := 0;
end
;
end;
end
;if _cont.contents= 1 then
begin
begin
if _have.contents= 0 then
begin
begin
_keys := ( cs.contents lsl 1 );
_inds := _rpn_index_offsets.(cs.contents);
if ( Char.code data.[p.contents] )<= 115 && ( Char.code data.[p.contents] )>= 9 then
begin
begin
let _ic : int ref = ref _rpn_char_class.(( Char.code data.[p.contents] )- 9) in
if _ic.contents<= _rpn_trans_keys.( _keys.contents+1 )&& _ic.contents>= _rpn_trans_keys.( _keys.contents ) then
begin
_trans := _rpn_indices.( _inds.contents+ ( _ic.contents- _rpn_trans_keys.( _keys.contents ) ) );
end
else
begin
_trans := _rpn_index_defaults.(cs.contents);
end
;
end;
end
else
begin
begin
_trans := _rpn_index_defaults.(cs.contents);
end;
end
;
end;
end
;if _cont.contents= 1 then
begin
begin
cs := _rpn_cond_targs.(_trans.contents);
if _rpn_cond_actions.(_trans.contents) = 8 then
begin
begin
mark := !p
end;
end
else if _rpn_cond_actions.(_trans.contents) = 1 then
begin
begin
Stack.push (int_of_string (String.sub data !mark (!p - !mark))) st
end;
end
else if _rpn_cond_actions.(_trans.contents) = 4 then
begin
begin
let y = Stack.pop st in let x = Stack.pop st in Stack.push (x + y) st
end;
end
else if _rpn_cond_actions.(_trans.contents) = 6 then
begin
begin
let y = Stack.pop st in let x = Stack.pop st in Stack.push (x - y) st
end;
end
else if _rpn_cond_actions.(_trans.contents) = 5 then
begin
begin
let y = Stack.pop st in let x = Stack.pop st in Stack.push (x * y) st
end;
end
else if _rpn_cond_actions.(_trans.contents) = 7 then
begin
begin
let y = Stack.pop st in let x = Stack.pop st in Stack.push (x / y) st
end;
end
else if _rpn_cond_actions.(_trans.contents) = 3 then
begin
begin
Stack.push (abs (Stack.pop st)) st
end;
end
else if _rpn_cond_actions.(_trans.contents) = 2 then
begin
begin
Stack.push 666 st
end;
end
;
if cs.contents= 0 then
begin
_cont := 0;
end
;if _cont.contents= 1 then
begin
p := p.contents + 1;
end
;
end;
end
;
end;
end
;
end;
done;
end;
if !cs < rpn_first_final then
begin
if !p = !pe then
fail "unexpected eof"
else
fail "error at position %d" !p
end;
if Stack.is_empty st then
fail "rpn stack empty on result"
else
Stack.pop st
(* ////////////////////////////////////////////////////////////////////// *)
let rpnTests = [
("666\n", 666);
("666 111\n", 111);
("4 3 add\n", 7);
("4 3 +\n", 7);
("4 3 -\n", 1);
("4 3 *\n", 12);
("6 2 /\n", 3);
("0 3 -\n", -3);
("0 3 - abs\n", 3);
(" 2 2 + 3 - \n", 1);
("10 7 3 2 * - +\n", 11);
("abba abba add\n", 1332);
]
let rpnFailTests = [
("\n")
]
let () =
List.iter (fun (s,x) -> test rpn s x) rpnTests;
List.iter (fun s -> error rpn s) rpnFailTests
|
