Basic system, incomplete.
Still needs the rest of the core functions and defs. Could read defs from a file at compile-time? Integer math? Boolean ops? Just type inference and maybe compiling?
This commit is contained in:
Simon Forman
parent
b49e7458c2
commit
caa4461217
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@ -1,4 +1,5 @@
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:- dynamic(def/2).
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% For number_codes/2 we want to just fail if the codes do not represent an integer.
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% gprolog.html#number-atom%2F2
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@ -6,6 +7,12 @@
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:- set_prolog_flag(syntax_error, fail).
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joy(InputString, StackIn, StackOut) :-
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text_to_expression(InputString, Expression),
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!,
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thun(Expression, StackIn, StackOut).
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joy_lex([tok(Token)|Ls]) --> chars(Token), !, joy_lex(Ls).
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joy_lex([ lbracket|Ls]) --> "[", !, joy_lex(Ls).
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joy_lex([ rbracket|Ls]) --> "]", !, joy_lex(Ls).
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@ -24,7 +31,7 @@ joy_parse([]) --> [].
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joy_term(list(J)) --> [lbracket], !, joy_parse(J), [rbracket].
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joy_term(Token) --> [tok(Codes)], {joy_token(Token, Codes)}.
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joy_token(int(I), Codes) :- write(Codes) ,number_codes(I, Codes), !.
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joy_token(int(I), Codes) :- number_codes(I, Codes), !.
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joy_token(bool(true), "true") :- !.
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joy_token(bool(false), "false") :- !.
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joy_token(symbol(S), Codes) :- atom_codes(S, Codes).
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@ -67,3 +74,98 @@ blank --> [226, 128, 169].
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blank --> [226, 128, 175].
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blank --> [226, 129, 159].
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blank --> [227, 128, 128].
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thun([], S, S).
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thun([Term|E], Si, So) :- thun(Term, E, Si, So).
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thun(A, [], S, [A|S]) :- var(A), !.
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thun(A, [T|E], S, So) :- var(A), !, thun(T, E, [A|S], So).
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thun(int(A), [], B, [int(A)|B]).
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thun(int(C), [A|B], D, E) :- thun(A, B, [int(C)|D], E).
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thun(bool(A), [], B, [bool(A)|B]).
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thun(bool(C), [A|B], D, E) :- thun(A, B, [bool(C)|D], E).
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thun(list(A), [], B, [list(A)|B]).
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thun(list(C), [A|B], D, E) :- thun(A, B, [list(C)|D], E).
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thun(symbol(A), [], B, C) :- func(A, B, C).
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thun(symbol(A), [C|D], B, F) :- func(A, B, E), thun(C, D, E, F).
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thun(symbol(Combo), E, Si, So) :- combo(Combo, Si, S, E, Eo), thun(Eo, S, So).
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thun(symbol(D), [], Si, So) :- def(D, [DH| E]), thun(DH, E, Si, So).
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thun(symbol(D), [H|E0], Si, So) :- def(D, [DH|DE]),
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append(DE, [H|E0], E), /* ................. */ thun(DH, E, Si, So).
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% Some error handling.
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thun(symbol(Unknown), _, _, _) :-
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\+ def(Unknown, _),
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\+ func(Unknown, _, _),
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\+ combo(Unknown, _, _, _, _),
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write('Unknown: '),
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write(Unknown),
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fail.
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func(swap, [A, B|S], [B, A|S]).
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func(dup, [A|S], [A, A|S]).
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func(pop, [_|S], S ).
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func(cons, [list(A), B |S], [list([B|A])|S]).
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func(concat, [list(A), list(B)|S], [list(C)|S]) :- append(B, A, C).
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func(swaack, [list(R)|S], [list(S)|R]).
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func(stack, S , [list(S)|S]).
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func(clear, _ , []).
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func(first, [list([X|_])|S], [ X |S]).
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func(rest, [list([_|X])|S], [list(X)|S]).
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func(bool, [ int(0)|S], [bool(false)|S]).
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func(bool, [ list([])|S], [bool(false)|S]).
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func(bool, [bool(false)|S], [bool(false)|S]).
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func(bool, [ int(N)|S], [bool(true)|S]) :- N #\= 0.
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func(bool, [list([_|_])|S], [bool(true)|S]).
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func(bool, [ bool(true)|S], [bool(true)|S]).
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func( + , [int(A), int(B)|S], [int(A + B)|S]).
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func( - , [int(A), int(B)|S], [int(B - A)|S]).
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func( * , [int(A), int(B)|S], [int(A * B)|S]).
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func( / , [int(A), int(B)|S], [int(B div A)|S]).
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func('%', [int(A), int(B)|S], [int(B mod A)|S]).
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func( add , [int(A), int(B)|S], [int(A + B)|S]).
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func( sub , [int(A), int(B)|S], [int(B - A)|S]).
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func( mul , [int(A), int(B)|S], [int(A * B)|S]).
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func( div , [int(A), int(B)|S], [int(B div A)|S]).
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func( mod, [int(A), int(B)|S], [int(B mod A)|S]).
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combo(i, [list(P)|S], S, Ei, Eo) :- append(P, Ei, Eo).
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combo(dip, [list(P), X|S], S, Ei, Eo) :- append(P, [X|Ei], Eo).
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combo(branch, [list(T), list(_), bool(true)|S], S, Ei, Eo) :- append(T, Ei, Eo).
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combo(branch, [list(_), list(F), bool(false)|S], S, Ei, Eo) :- append(F, Ei, Eo).
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combo(loop, [list(_), bool(false)|S], S, E, E ).
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combo(loop, [list(B), bool(true)|S], S, Ei, Eo) :- append(B, [list(B), symbol(loop)|Ei], Eo).
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joy_def(Codes) :-
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text_to_expression(Codes, [symbol(Name)|Body]),
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assert_def(Name, Body).
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assert_def(Symbol, Body) :-
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( % Don't let this "shadow" functions or combinators.
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\+ func(Symbol, _, _),
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\+ combo(Symbol, _, _, _, _)
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) -> ( % Replace any existing defs of this name.
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retractall(def(Symbol, _)),
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assertz(def(Symbol, Body))
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) ; true.
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joydef("enstacken stack [clear] dip").
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