-
stdin_to_codes(Codes) :-
% Pass in and discard atom 'code' to prime stdin_to_codes/2.
stdin_to_codes(code, [code|Codes]).
get_code(NextCode),
stdin_to_codes(NextCode, Codes).
+
%
%joy(InputString, StackIn, StackOut) :-
% text_to_expression(InputString, Expression),
joy_term(list(J)) --> [lbracket], !, joy_parse(J), [rbracket].
joy_term(Token) --> [tok(Codes)], {joy_token(Token, Codes)}.
-joy_token(int(I), Codes) :- catch(number_codes(I, Codes), _Err, fail), !.
+joy_token(int(I), Codes) :- numeric(Codes), atom_codes(I, Codes), !.
joy_token(bool(true), "true") :- !.
joy_token(bool(false), "false") :- !.
joy_token(symbol(S), Codes) :- atom_codes(S, Codes).
char(Ch) --> \+ blank, [Ch], { Ch \== 0'[, Ch \== 0'] }.
+numeric(Codes) :- digits(Codes, []), !.
+numeric([45,FirstDigit|Codes]) :- digit(FirstDigit), digits(Codes, []), !.
+% ASCII 45 is '-'.
+
+digits --> digit, digits.
+digits --> [].
+
+digit --> [Code], { digit(Code) }.
+
+digit(Code) :- between(0'0, 0'9, Code).
blank --> [9].
blank --> [10].
:- initialization((
stdin_to_codes(Codes),
text_to_expression(Codes, Expr),
- print(Expr), print('\n')
- )).
\ No newline at end of file
+ write_term(Expr, [quoted(true)]), print('\n')
+ )).
--- /dev/null
+
+format_joy_expression( int(I)) --> { integer(I), !, number_codes(I, Codes) }, Codes.
+format_joy_expression( int(I)) --> { atom(I), !, atom_codes(I, Codes) }, Codes.
+format_joy_expression( int(I)) --> { write_to_codes(Codes, I) }, [40], Codes, [41].
+format_joy_expression( bool(B)) --> { atom_codes(B, Codes) }, Codes.
+format_joy_expression(symbol(S)) --> { atom_codes(S, Codes) }, Codes.
+format_joy_expression(symbol(S)) --> { atom_codes(S, Codes) }, Codes.
+format_joy_expression( list(J)) --> "[", format_joy_terms(J), "]".
+
+format_joy_terms( []) --> [].
+format_joy_terms( [T]) --> format_joy_expression(T), !.
+format_joy_terms([T|Ts]) --> format_joy_expression(T), " ", format_joy_terms(Ts).
+
+codes_to_stream([Code|Codes], Stream) :-
+ put_code(Stream, Code), !,
+ codes_to_stream(Codes, Stream).
+codes_to_stream([], _).
+
+:- initialization((
+ read_term(AST, [end_of_term(eof)]),
+ format_joy_terms(AST, Codes, []),
+ codes_to_stream(Codes, user_output), print('\n')
+ )).
+
+
--- /dev/null
+
+
+thun([], S, S).
+thun([Term|E], Si, So) :- thun(Term, E, Si, So).
+
+thun(A, [], S, [A|S]) :- var(A), !.
+thun(A, [T|E], S, So) :- var(A), !, thun(T, E, [A|S], So).
+
+thun(int(A), [], B, [int(A)|B]).
+thun(int(C), [A|B], D, E) :- thun(A, B, [int(C)|D], E).
+
+thun(bool(A), [], B, [bool(A)|B]).
+thun(bool(C), [A|B], D, E) :- thun(A, B, [bool(C)|D], E).
+
+thun(list(A), [], B, [list(A)|B]).
+thun(list(C), [A|B], D, E) :- thun(A, B, [list(C)|D], E).
+
+thun(symbol(A), [], B, C) :- func(A, B, C).
+thun(symbol(A), [C|D], B, F) :- func(A, B, E), thun(C, D, E, F).
+
+thun(symbol(Combo), E, Si, So) :- combo(Combo, Si, S, E, Eo), thun(Eo, S, So).
+
+
+func(swap, [A, B|S], [B, A|S]).
+func(dup, [A|S], [A, A|S]).
+func(pop, [_|S], S ).
+
+func(cons, [list(A), B |S], [list([B|A])|S]).
+
+func(swaack, [list(R)|S], [list(S)|R]).
+func(stack, S , [list(S)|S]).
+func(clear, _ , []).
+func(first, [list([X|_])|S], [ X |S]).
+func(rest, [list([_|X])|S], [list(X)|S]).
+
+func(bool, [ int(0)|S], [bool(false)|S]).
+func(bool, [ list([])|S], [bool(false)|S]).
+func(bool, [bool(false)|S], [bool(false)|S]).
+
+func(bool, [ int(N)|S], [bool(true)|S]) :- N #\= 0.
+func(bool, [list([_|_])|S], [bool(true)|S]).
+func(bool, [ bool(true)|S], [bool(true)|S]).
+
+func( + , [int(A), int(B)|S], [int(A + B)|S]).
+func( - , [int(A), int(B)|S], [int(B - A)|S]).
+func( * , [int(A), int(B)|S], [int(A * B)|S]).
+func( / , [int(A), int(B)|S], [int(B div A)|S]).
+func('%', [int(A), int(B)|S], [int(B mod A)|S]).
+
+func( add , [int(A), int(B)|S], [int(A + B)|S]).
+func( sub , [int(A), int(B)|S], [int(B - A)|S]).
+func( mul , [int(A), int(B)|S], [int(A * B)|S]).
+func( div , [int(A), int(B)|S], [int(B div A)|S]).
+func( mod, [int(A), int(B)|S], [int(B mod A)|S]).
+
+
+combo(i, [list(P)|S], S, Ei, Eo) :- append(P, Ei, Eo).
+combo(dip, [list(P), X|S], S, Ei, Eo) :- append(P, [X|Ei], Eo).
+
+combo(branch, [list(T), list(_), bool(true)|S], S, Ei, Eo) :- append(T, Ei, Eo).
+combo(branch, [list(_), list(F), bool(false)|S], S, Ei, Eo) :- append(F, Ei, Eo).
+
+combo(loop, [list(_), bool(false)|S], S, E, E ).
+combo(loop, [list(B), bool(true)|S], S, Ei, Eo) :- append(B, [list(B), symbol(loop)|Ei], Eo).
+
+
+
+:- initialization((
+ read_term(AST, [end_of_term(eof)]),
+ thun(AST, [], Stack),
+ write_term(Stack, [quoted(true)]), print('\n')
+ )).
+