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https://github.com/kanaka/mal.git
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63 lines
1.7 KiB
Prolog
63 lines
1.7 KiB
Prolog
% -*- mode: prolog; -*- select prolog mode in the emacs text editor
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:- format_predicate('F', format_mal_form(_Arg,_Form)).
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:- format_predicate('L', format_mal_list(_Arg,_Forms)).
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format_mal_list(_Arg, Forms) :- print_list(t, " ", Forms).
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format_mal_form(_Arg, Form) :- pr_str(t, Form).
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pr_str(t, String) :- string(String), !,
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write("\""),
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string_codes(String, Codes),
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maplist(pr_str_escape, Codes),
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write("\"").
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pr_str(_, Atomic) :- atomic(Atomic), !,
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% number, symbol, nil, true, false, unreadable string.
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write(Atomic).
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pr_str(_, mal_kwd(Keyword)) :- !,
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put_char(:),
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write(Keyword).
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pr_str(Readably, Vector) :- vector(Elements, Vector), !,
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write("["),
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print_list(Readably, " ", Elements),
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write("]").
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pr_str(Readably, List) :- list(Elements, List), !,
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write("("),
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print_list(Readably, " ", Elements),
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write(")").
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pr_str(Readably, Map) :- map_to_key_value_list(Map, Key_Value_List), !,
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write("{"),
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print_list(Readably, " ", Key_Value_List),
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write("}").
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pr_str(_, Fn) :- mal_fn(_Goal, Fn), !, write("<fn>").
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pr_str(_, Macro) :- mal_macro(_Fn, Macro), !,
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write("<macro>").
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pr_str(_, Atom) :- mal_atom(Value, Atom), !,
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format("(atom ~F)", [Value]).
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pr_str(_, Invalid) :-
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format(string(Msg), "pr_str detected an invalid form: ~w\n", [Invalid]),
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print_message(warning, Msg),
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abort.
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pr_str_escape(0'\n) :- write("\\n").
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pr_str_escape(0'") :- write("\\\"").
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pr_str_escape(0'\\) :- write("\\\\").
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pr_str_escape(C) :- put_code(C).
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print_list(_, _, []).
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print_list(Readably, Separator, [X | Xs]) :-
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pr_str(Readably, X),
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maplist(print_list_append(Readably, Separator), Xs).
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print_list_append(Readably, Separator, Element) :-
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write(Separator),
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pr_str(Readably, Element).
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