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Minor edits.

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sforman 2023-07-25 10:04:45 -07:00
parent f2688e311f
commit 18b5d5b497
1 changed files with 34 additions and 39 deletions
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73
implementations/GNUProlog/joy_to_ast.prolog
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@ -1,48 +1,32 @@
stdin_to_codes(Codes) :-
% Pass in and discard atom 'code' to prime stdin_to_codes/2.
stdin_to_codes(code, [code|Codes]).
stdin_to_codes(-1, []) :- !.
stdin_to_codes(Code, [Code|Codes]) :-
get_code(NextCode),
stdin_to_codes(NextCode, Codes).
%
%joy(InputString, StackIn, StackOut) :-
% text_to_expression(InputString, Expression),
% !,
% thun(Expression, StackIn, StackOut).
%
joy_lex([tok(Token)|Ls]) --> chars(Token), !, joy_lex(Ls).
joy_lex([ lbracket|Ls]) --> "[", !, joy_lex(Ls).
joy_lex([ rbracket|Ls]) --> "]", !, joy_lex(Ls).
joy_lex(Ls) --> blank, !, joy_lex(Ls).
joy_lex([]) --> [].
% Then parse the tokens converting them to Prolog values and building up
% the list structures (if any.)
joy_parse([J|Js]) --> joy_term(J), !, joy_parse(Js).
joy_parse([]) --> [].
joy_term(list(J)) --> [lbracket], !, joy_parse(J), [rbracket].
joy_term(Token) --> [tok(Codes)], {joy_token(Token, Codes)}.
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).
text_to_expression(Text, Expression) :-
phrase(joy_lex(Tokens), Text), !,
phrase(joy_parse(Expression), Tokens).
joy_lex([tok(Token)|Ls]) --> chars(Token), !, joy_lex(Ls).
joy_lex([ lbracket|Ls]) --> "[", !, joy_lex(Ls).
joy_lex([ rbracket|Ls]) --> "]", !, joy_lex(Ls).
joy_lex( Ls ) --> blank, !, joy_lex(Ls).
joy_lex([]) --> [].
joy_parse([J|Js]) --> joy_term(J), !, joy_parse(Js).
joy_parse([]) --> [].
joy_term(list(J)) --> [lbracket], !, joy_parse(J), [rbracket].
joy_term(Term) --> [tok(Codes)], { joy_term(Term, Codes) }.
joy_term( int(I), Codes) :- numeric(Codes), !, atom_codes(I, Codes).
joy_term( bool(true), "true") :- !.
joy_term(bool(false), "false") :- !.
joy_term( symbol(S), Codes) :- atom_codes(S, Codes).
% Apologies for all the (green, I hope) cuts. The strength of the Joy
% syntax is that it's uninteresting.
@ -62,6 +46,8 @@ digit --> [Code], { digit(Code) }.
digit(Code) :- between(0'0, 0'9, Code).
% TODO: code golf this into something more efficient.
blank --> [9].
blank --> [10].
blank --> [11].
@ -89,6 +75,15 @@ blank --> [226, 129, 159].
blank --> [227, 128, 128].
stdin_to_codes(Codes) :- stdin_to_codes(code, [code|Codes]).
% Pass in and discard atom 'code' to prime stdin_to_codes/2.
stdin_to_codes(-1, []) :- !.
stdin_to_codes(Code, [Code|Codes]) :-
get_code(NextCode),
stdin_to_codes(NextCode, Codes).
:- initialization((
stdin_to_codes(Codes),
text_to_expression(Codes, Expr),