%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Logtalk - Open source object-oriented logic programming language
%  Release 2.33.3
%
%  Copyright (c) 1998-2008 Paulo Moura.        All Rights Reserved.
%  Logtalk is free software.  You can redistribute it and/or modify
%  it under the terms of the "Artistic License 2.0" as published by 
%  The Perl Foundation. Consult the "LICENSE.txt" file for details.
%
%
%  configuration file for CxProlog 0.97.2 or a later version
%
%  last updated: November 7, 2008
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


:- set_prolog_flag(keep_source, false).
:- set_prolog_flag(unknown, error).
:- set_prolog_flag(file_name_variables, true).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ISO Prolog Standard predicates that we must define because they are
%  not built-in
%
%  add a clause for lgt_iso_predicate/1 declaring each ISO predicate that
%  we must define; there must be at least one clause for this predicate
%  whose call should fail if we don't define any ISO predicates
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% '$lgt_iso_predicate'(?callable).
%
% table of definition for missing ISO predicates

'$lgt_iso_predicate'(_) :-
    fail.



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  predicate properties
%
%  this predicate must return at least static, dynamic, and built_in 
%  properties for an existing predicate
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% '$lgt_predicate_property'(+callable, ?predicate_property)

'$lgt_predicate_property'(Pred, Prop) :-
	predicate_property(Pred, Prop).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  meta-predicates
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% call_cleanup(+callable, +callble) -- built-in


% forall(+callable, +callble) -- built-in


% retractall(+callable) -- built-in


% lgt_call/2-9
%
% if your compiler provides call/1-9 as built-in 
% predicates rewrite these definitions using call(...).

call_with_args(F, A) :-
	call(F, A).


call_with_args(F, A1, A2) :-
	call(F, A1, A2).


call_with_args(F, A1, A2, A3) :-
	call(F, A1, A2, A3).


call_with_args(F, A1, A2, A3, A4) :-
	call(F, A1, A2, A3, A4).


call_with_args(F, A1, A2, A3, A4, A5) :-
	call(F, A1, A2, A3, A4, A5).


call_with_args(F, A1, A2, A3, A4, A5, A6) :-
	call(F, A1, A2, A3, A4, A5, A6).


call_with_args(F, A1, A2, A3, A4, A5, A6, A7) :-
	call(F, A1, A2, A3, A4, A5, A6, A7).


call_with_args(F, A1, A2, A3, A4, A5, A6, A7, A8) :-
	call(F, A1, A2, A3, A4, A5, A6, A7, A8).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Prolog built-in meta-predicates
%
%  (excluding ISO Prolog Standard meta-predicates)
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% '$lgt_pl_meta_predicate'(?callable, ?atom).

'$lgt_pl_meta_predicate'(catch(::, *, *, ::), predicate).
'$lgt_pl_meta_predicate'(gen(::), predicate).
'$lgt_pl_meta_predicate'(possible(::), predicate).
'$lgt_pl_meta_predicate'(question(::, *), predicate).
'$lgt_pl_meta_predicate'(not(::), predicate).
'$lgt_pl_meta_predicate'(on_exception(*, ::, ::), predicate).
'$lgt_pl_meta_predicate'(process_new(*, ::, ::), predicate).
'$lgt_pl_meta_predicate'(thread_new(*, ::, ::), predicate).
'$lgt_pl_meta_predicate'(try(::), predicate).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  file extension predicates
%
%  these extensions are used by Logtalk load/compile predicates
%
%  you may want to change the extension for Prolog files to match 
%  the one expected by your Prolog compiler
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% '$lgt_file_extension'(?atom, ?atom)

'$lgt_file_extension'(logtalk, '.lgt').
'$lgt_file_extension'(prolog, '.pl').
'$lgt_file_extension'(xml, '.xml').



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  default flag values
%
%  if your Prolog compiler supports the ISO definition of the 
%  initialization/1 then change the default value below to true
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% '$lgt_default_flag'(?atom, ?atom)
%
% default values for all flags

'$lgt_default_flag'(prolog, cx).

'$lgt_default_flag'(xmldocs, on).
'$lgt_default_flag'(xslfile, 'lgtxml.xsl').
'$lgt_default_flag'(xmlspec, dtd).
'$lgt_default_flag'(xmlsref, local).

'$lgt_default_flag'(unknown, warning).
'$lgt_default_flag'(misspelt, warning).
'$lgt_default_flag'(singletons, warning).
'$lgt_default_flag'(lgtredef, warning).
'$lgt_default_flag'(plredef, silent).
'$lgt_default_flag'(portability, silent).

'$lgt_default_flag'(report, on).

'$lgt_default_flag'(smart_compilation, off).
'$lgt_default_flag'(reload, always).

'$lgt_default_flag'(startup_message, flags(verbose)).

'$lgt_default_flag'(underscore_variables, singletons).

'$lgt_default_flag'(code_prefix, '').

'$lgt_default_flag'(debug, off).
'$lgt_default_flag'(break_predicate, unsupported).

'$lgt_default_flag'(complements, off).
'$lgt_default_flag'(dynamic_declarations, off).
'$lgt_default_flag'(events, off).

'$lgt_default_flag'(altdirs, off).
'$lgt_default_flag'(tmpdir, 'lgt_tmp/').
'$lgt_default_flag'(xmldir, 'xml_docs/').

'$lgt_default_flag'(encoding_directive, source).
'$lgt_default_flag'(multifile_directive, supported).
'$lgt_default_flag'(threads, unsupported).

'$lgt_default_flag'(context_switching_calls, allow).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  list predicates
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


'$lgt_append'([], List, List).
'$lgt_append'([Head| Tail], List, [Head| Tail2]) :-
	'$lgt_append'(Tail, List, Tail2).


'$lgt_member'(Head, [Head| _]).
'$lgt_member'(Head, [_| Tail]) :-
	'$lgt_member'(Head, Tail).


'$lgt_member_var'(V, [H| _]) :-
	V == H.
'$lgt_member_var'(V, [_| T]) :-
	'$lgt_member_var'(V, T).


'$lgt_is_list'([]) :-
    !.
'$lgt_is_list'([_| Tail]) :-
    '$lgt_is_list'(Tail).


'$lgt_is_proper_list'(List) :-
    List == [], !.
'$lgt_is_proper_list'([_| Tail]) :-
    nonvar(Tail),
    '$lgt_is_proper_list'(Tail).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  file predicates
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% '$lgt_file_exists'(+atom)
%
% see if a file exist in the current directory

'$lgt_file_exists'(File) :-
	fs_exists_file(File).


% '$lgt_directory_exists'(+atom)
%
% checks if a directory exists

'$lgt_directory_exists'(Directory) :-
	fs_exists_dir(Directory).


% '$lgt_current_directory'(-atom)
%
% gets current working directory

'$lgt_current_directory'(Directory) :-
	fs_cwd(Directory).


% '$lgt_change_directory'(+atom)
%
% changes current working directory

'$lgt_change_directory'(Directory) :-
	fs_cwd(_, Directory).


% '$lgt_make_directory'(+atom)
%
% makes a new directory; succeeds if the directory already exists

'$lgt_make_directory'(Directory) :-
	(	fs_exists_dir(Directory) ->
		true
	;	fs_mkdir(Directory)
	).


% '$lgt_load_prolog_code'(+atom, +atom, +list)
%
% compile and load a Prolog file, resulting from a
% Logtalk source file, given a list of options

'$lgt_load_prolog_code'(File, _, [encoding(Encoding)]) :-
	!,
	current_prolog_flag(encoding, Default),
	set_prolog_flag(encoding, Encoding),
	catch(consult(File), Error, (set_prolog_flag(encoding, Default), throw(Error))),
	set_prolog_flag(encoding, Default).

'$lgt_load_prolog_code'(File, _, _) :-
	consult(File).


% '$lgt_compare_file_mtimes'(?atom, +atom, +atom)
%
% compare file modification times
%
% should fail if file modification times cannot be retrived 
% or if one of the files does not exist

'$lgt_compare_file_mtimes'(Result, File1, File2) :-
	fs_property(File1, time, [_, Time1]),
	fs_property(File2, time, [_, Time2]),
	compare(Result, Time1, Time2).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  sorting predicates
%
%  note that sort/2 and keysort/2 are buitl-in predicates in most Prolog 
%  compilers
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% '$lgt_keysort'(+list, -list)

'$lgt_keysort'(List, Sorted) :-
	keysort(List, Sorted).


% '$lgt_sort'( +List, -Sorted )

'$lgt_sort'(List, Sorted) :-
	sort(List, Sorted).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  time and date predicates
%
%  if your Prolog compiler does not provide access to the operating system 
%  time and date just write dummy definitions
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% '$lgt_current_date'(?Year, ?Month, ?Day)

'$lgt_current_date'(2006, 6, 25).


% '$lgt_current_time'(?Hours, ?Mins, ?Secs)

'$lgt_current_time'(10, 39, 12).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  timing predicate
%
%  if your Prolog compiler does not provide access to a timing predicate 
%  just write dummy definition
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% '$lgt_cpu_time'(-Seconds)

'$lgt_cpu_time'(Seconds) :-
	Seconds is cputime.



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  comparison predicate
%
%  the usual compare/3 definition
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% compare(?atom, @term, @term) -- built-in



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  callable predicate
%
%  the usual callable/1 definition
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% callable(@term) -- built-in



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  read character predicate
%
%  read a single character echoing it and writing a newline after
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


'$lgt_read_single_char'(Char) :-
	get_single_char(Code), put_code(Code), char_code(Char, Code),
	(	Code =:= 10 ->
		true
	;	nl
	).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  pretty print a term by naming its free variables
%  (avoid instantiating variables in term by using double negation if necessary)
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


'$lgt_pretty_print_vars'(Stream, Term) :-
	\+ \+ (numbervars(Term, 1, _), write(Stream, Term)).


'$lgt_pretty_print_vars_quoted'(Stream, Term) :-
	\+ \+ (numbervars(Term, 1, _), writeq(Stream, Term)).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  getting stream current line number
%  (needed for improved compiler error messages)
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% '$lgt_stream_current_line_number'(@stream, -integer)

'$lgt_stream_current_line_number'(_, _) :-
	fail.



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  customized version of the read_term/3 predicate for returning the line
%  where the term starts (needed for improved compiler error messages)
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% '$lgt_read_term'(@stream, -term, +list, -integer)

'$lgt_read_term'(Stream, Term, Options, -1) :-
	read_term(Stream, Term, Options).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  handling of Prolog-proprietary directives on Logtalk source files
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% '$lgt_ignore_pl_directive'(@callable)

'$lgt_ignore_pl_directive'(_) :-
	fail.


% '$lgt_rewrite_and_copy_pl_directive'(@callable, -callable)

'$lgt_rewrite_and_copy_pl_directive'(_, _) :-
	fail.


% '$lgt_rewrite_and_recompile_pl_directive'(@callable, -callable)

'$lgt_rewrite_and_recompile_pl_directive'(_, _) :-
	fail.



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Shortcut to the Logtalk built-in predicate logtalk_load/1
%
%  defined in the config files in order to be able to comment it out in case
%  of conflict with some Prolog native feature; it implies conformance with
%  the ISO Prolog standard regarding the definition of the {}/1 syntax
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

{File, Files} :-
	!,
	logtalk_load(File),
	{Files}.
{File} :-
	logtalk_load(File).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% converts between Prolog stream encoding names and XML encoding names
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


% '$lgt_logtalk_prolog_encoding'(?atom, ?atom, +stream)

'$lgt_logtalk_prolog_encoding'('US-ASCII', ascii, _).
'$lgt_logtalk_prolog_encoding'('ISO-8859-1', iso_latin_1, _).
'$lgt_logtalk_prolog_encoding'('UTF-8', utf8, _).
'$lgt_logtalk_prolog_encoding'('UCS-2', Encoding, Stream) :-	% UTF-16 subsumes UCS-2
	'$lgt_logtalk_prolog_encoding'('UTF-16', Encoding, Stream).
'$lgt_logtalk_prolog_encoding'('UCS-2BE', unicode_be, _).
'$lgt_logtalk_prolog_encoding'('UCS-2LE', unicode_le, _).
'$lgt_logtalk_prolog_encoding'('UTF-16', Encoding, Stream) :-	% BOM optional but strongly recommended
	(	stream_property(Stream, encoding(utf16be)) ->
		Encoding = utf16be
	;	stream_property(Stream, encoding(utf16le)) ->
		Encoding = utf16le
	).
'$lgt_logtalk_prolog_encoding'('UTF-16BE', utf16be, _).			% BOM forbidden
'$lgt_logtalk_prolog_encoding'('UTF-16LE', utf16le, _).
'$lgt_logtalk_prolog_encoding'('UTF-32', Encoding, Stream) :-	% BOM mandatory
	(	stream_property(Stream, encoding(utf32be)) ->
		Encoding = utf32be
	;	stream_property(Stream, encoding(utf32le)) ->
		Encoding = utf32le
	).
'$lgt_logtalk_prolog_encoding'('UTF-32BE', utf32be, _).			% BOM forbidden
'$lgt_logtalk_prolog_encoding'('UTF-32LE', utf32le, _).



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  end!
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%