131 lines
3.3 KiB
Prolog
131 lines
3.3 KiB
Prolog
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: charsio.yap *
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* Last rev: 5/12/99 *
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* mods: *
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* comments: I/O on character strings *
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* *
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*************************************************************************/
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:- module(charsio, [
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format_to_chars/3,
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format_to_chars/4,
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write_to_chars/3,
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write_to_chars/2,
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atom_to_chars/3,
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atom_to_chars/2,
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number_to_chars/3,
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number_to_chars/2,
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read_from_chars/2,
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open_chars_stream/2,
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with_output_to_chars/2,
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with_output_to_chars/3,
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with_output_to_chars/4,
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term_to_atom/2
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]).
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:- meta_predicate(with_output_to_chars(0,?)).
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:- meta_predicate(with_output_to_chars(0,-,?)).
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:- meta_predicate(with_output_to_chars(0,-,?,?)).
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format_to_chars(Form, Args, OUT) :-
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format_to_chars(Form, Args, OUT, []).
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format_to_chars(Form, Args, OUT, L0) :-
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open_mem_write_stream(Stream),
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format(Stream,Form,Args),
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peek_mem_write_stream(Stream, L0, O),
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close(Stream),
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O = OUT.
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write_to_chars(Term, OUT) :-
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write_to_chars(Term, [], OUT).
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write_to_chars(Term, L0, OUT) :-
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open_mem_write_stream(Stream),
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write(Stream, Term),
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peek_mem_write_stream(Stream, L0, O),
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close(Stream),
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O = OUT.
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atom_to_chars(Atom, OUT) :-
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atom_to_chars(Atom, [], OUT).
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atom_to_chars(Atom, L0, OUT) :-
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var(Atom), !,
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throw(error(instantiation_error,atom_to_chars(Atom, L0, OUT))).
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atom_to_chars(Atom, L0, OUT) :-
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atom(Atom), !,
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open_mem_write_stream(Stream),
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write(Stream, Atom),
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peek_mem_write_stream(Stream, L0, O),
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close(Stream),
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O = OUT.
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atom_to_chars(Atom, L0, OUT) :-
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throw(error(type_error(atom,Atom),atom_to_chars(Atom, L0, OUT))).
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number_to_chars(Number, OUT) :-
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number_to_chars(Number, [], OUT).
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number_to_chars(Number, L0, OUT) :-
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var(Number), !,
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throw(error(instantiation_error,number_to_chars(Number, L0, OUT))).
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number_to_chars(Number, L0, OUT) :-
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number(Number), !,
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open_mem_write_stream(Stream),
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write(Stream, Number),
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peek_mem_write_stream(Stream, L0, O),
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close(Stream),
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O = OUT.
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number_to_chars(Number, L0, OUT) :-
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throw(error(type_error(number,Number),number_to_chars(Number, L0, OUT))).
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read_from_chars(Chars, Term) :-
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open_mem_read_stream(Chars, Stream),
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read(Stream, T),
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close(Stream),
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T = Term.
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open_chars_stream(Chars, Stream) :-
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open_mem_read_stream(Chars, Stream).
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with_output_to_chars(Goal, Chars) :-
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with_output_to_chars(Goal, [], Chars).
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with_output_to_chars(Goal, L0, Chars) :-
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with_output_to_chars(Goal, Stream, L0, Chars),
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close(Stream).
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with_output_to_chars(Goal, Stream, L0, Chars) :-
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open_mem_write_stream(Stream),
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current_output(SO),
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set_output(Stream),
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do_output_to_chars(Goal, Stream, L0, Chars, SO).
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do_output_to_chars(Goal, Stream, L0, Chars, SO) :-
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catch(Goal, Exception, handle_exception(Exception,Stream,SO)),
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!,
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set_output(SO),
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peek_mem_write_stream(Stream, L0, Chars).
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do_output_to_chars(_Goal, Stream, _L0, _Chars, SO) :-
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set_output(SO),
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close(Stream),
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fail.
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handle_exception(Exception, Stream, SO) :-
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close(Stream),
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current_output(SO),
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throw(Exception).
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