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yap-6.3/swi/library/quintus.pl

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2010-06-23 11:49:34 +01:00
/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2008, University of Amsterdam
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/
:- module(quintus,
[ % unix/1,
% file_exists/1,
abs/2,
sin/2,
cos/2,
tan/2,
log/2,
log10/2,
pow/3,
ceiling/2,
floor/2,
round/2,
acos/2,
asin/2,
atan/2,
atan2/3,
sign/2,
sqrt/2,
genarg/3,
(mode)/1,
(public)/1,
no_style_check/1,
otherwise/0,
simple/1,
% statistics/2, % Please access as quintus:statistics/2
prolog_flag/2,
date/1, % -date(Year, Month, Day)
current_stream/3, % ?File, ?Mode, ?Stream
stream_position/3, % +Stream, -Old, +New
skip_line/0,
skip_line/1, % +Stream
compile/1, % +File(s)
atom_char/2,
midstring/3, % ABC, B, AC
midstring/4, % ABC, B, AC, LenA
midstring/5, % ABC, B, AC, LenA, LenB
midstring/6, % ABC, B, AC, LenA, LenB, LenC
raise_exception/1, % +Exception
on_exception/3 % +Ball, :Goal, :Recover
]).
:- use_module(library(lists), [member/2]).
/** <module> Quintus compatibility
This module defines several predicates from the Quintus Prolog
libraries. Note that our library structure is totally different. If this
library were complete, Prolog code could be ported by removing the
use_module/1 declarations, relying on the SWI-Prolog autoloader.
Bluffers guide to porting:
* Remove =|use_module(library(...))|=
* Run =|?- list_undefined.|=
* Fix problems
Of course, this library is incomplete ...
*/
/********************************
* SYSTEM INTERACTION *
*********************************/
% %% unix(+Action)
% % interface to Unix.
% unix(system(Command)) :-
% shell(Command).
% unix(shell(Command)) :-
% shell(Command).
% unix(shell) :-
% shell.
% unix(access(File, 0)) :-
% access_file(File, read).
% unix(cd) :-
% expand_file_name(~, [Home]),
% working_directory(_, Home).
% unix(cd(Dir)) :-
% working_directory(_, Dir).
% unix(args(L)) :-
% current_prolog_flag(argv, L).
% unix(argv(L)) :-
% current_prolog_flag(argv, S),
% maplist(to_prolog, S, L).
% to_prolog(S, A) :-
% name(S, L),
% name(A, L).
/********************************
* META PREDICATES *
*********************************/
%% otherwise
%
% For (A -> B ; otherwise -> C)
% otherwise.
/********************************
* ARITHMETIC *
*********************************/
%% abs(+Number, -Absolute)
% Unify `Absolute' with the absolute value of `Number'.
abs(Number, Absolute) :-
Absolute is abs(Number).
%% sin(+Angle, -Sine) is det.
%% cos(+Angle, -Cosine) is det.
%% tan(+Angle, -Tangent) is det.
%% log(+X, -NatLog) is det.
%% log10(+X, -Log) is det.
%
% Math library predicates. SWI-Prolog (and ISO) support these as
% functions under is/2, etc.
sin(A, V) :- V is sin(A).
cos(A, V) :- V is cos(A).
tan(A, V) :- V is tan(A).
log(A, V) :- V is log(A).
log10(X, V) :- V is log10(X).
pow(X,Y,V) :- V is X**Y.
ceiling(X, V) :- V is ceil(X).
floor(X, V) :- V is floor(X).
round(X, V) :- V is round(X).
sqrt(X, V) :- V is sqrt(X).
acos(X, V) :- V is acos(X).
asin(X, V) :- V is asin(X).
atan(X, V) :- V is atan(X).
atan2(Y, X, V) :- V is atan(Y, X).
sign(X, V) :- V is sign(X).
/*******************************
* TERM MANIPULATION *
*******************************/
%% genarg(?Index, +Term, ?Arg) is nondet.
%
% Generalised version of ISO arg/3. SWI-Prolog's arg/3 is already
% genarg/3.
genarg(N, T, A) :- % SWI-Prolog arg/3 is generic
arg(N, T, A).
/*******************************
* FLAGS *
*******************************/
%% prolog_flag(?Flag, ?Value) is nondet.
%
% Same as ISO current_prolog_flag/2. Maps =version=.
%
% @bug Should map relevant Quintus flag identifiers.
% prolog_flag(version, Version) :- !,
% current_prolog_flag(version_data, swi(Major, Minor, Patch, _)),
% current_prolog_flag(arch, Arch),
% current_prolog_flag(compiled_at, Compiled),
% atomic_list_concat(['SWI-Prolog ',
% Major, '.', Minor, '.', Patch,
% ' (', Arch, '): ', Compiled], Version).
% prolog_flag(Flag, Value) :-
% current_prolog_flag(Flag, Value).
/*******************************
* STATISTICS *
*******************************/
% Here used to be a definition of Quintus statistics/2 in traditional
% SWI-Prolog statistics/2. The current built-in emulates Quintus
% almost completely.
/*******************************
* DATE/TIME *
*******************************/
%% date(-Date) is det.
%
% Get current date as date(Y,M,D)
date(Date) :-
get_time(T),
stamp_date_time(T, DaTime, local),
date_time_value(date, DaTime, Date).
/********************************
* STYLE CHECK *
*********************************/
%% no_style_check(Style) is det.
%
% Same as SWI-Prolog =|style_check(-Style)|=. The Quintus option
% =single_var= is mapped to =singleton=.
%
% @see style_check/1.
q_style_option(single_var, singleton) :- !.
q_style_option(Option, Option).
% no_style_check(QOption) :-
% q_style_option(QOption, SWIOption),
% style_check(-SWIOption).
/********************************
* DIRECTIVES *
*********************************/
% :- op(1150, fx, [(mode), (public)]).
% mode(_).
% public(_).
/*******************************
* TYPES *
*******************************/
%% simple(@Term) is semidet.
%
% Term is atomic or a variable.
% simple(X) :-
% ( atomic(X)
% -> true
% ; var(X)
% ).
/*******************************
* STREAMS *
*******************************/
%% current_stream(?Object, ?Mode, ?Stream)
%
% SICStus/Quintus and backward compatible predicate. New code should
% be using the ISO compatible stream_property/2.
% current_stream(Object, Mode, Stream) :-
% stream_property(Stream, mode(FullMode)),
% stream_mode(FullMode, Mode),
% ( stream_property(Stream, file_name(Object0))
% -> true
% ; stream_property(Stream, file_no(Object0))
% -> true
% ; Object0 = []
% ),
% Object = Object0.
% stream_mode(read, read).
% stream_mode(write, write).
% stream_mode(append, write).
% stream_mode(update, write).
% %% stream_position(+Stream, -Old, +New)
% stream_position(Stream, Old, New) :-
% stream_property(Stream, position(Old)),
% set_stream_position(Stream, New).
%% skip_line is det.
%% skip_line(Stream) is det.
%
% Skip the rest of the current line (on Stream). Same as
% =|skip(0'\n)|=.
skip_line :-
skip(10).
skip_line(Stream) :-
skip(Stream, 10).
/*******************************
* COMPILATION *
*******************************/
%% compile(+Files) is det.
%
% Compile files. SWI-Prolog doesn't distinguish between
% compilation and consult.
%
% @see load_files/2.
% :- meta_predicate
% compile(:).
% compile(Files) :-
% consult(Files).
/*******************************
* ATOM-HANDLING *
*******************************/
%% atom_char(+Char, -Code) is det.
%% atom_char(-Char, +Code) is det.
%
% Same as ISO char_code/2.
atom_char(Char, Code) :-
char_code(Char, Code).
%% midstring(?ABC, ?B, ?AC) is nondet.
%% midstring(?ABC, ?B, ?AC, LenA) is nondet.
%% midstring(?ABC, ?B, ?AC, LenA, LenB) is nondet.
%% midstring(?ABC, ?B, ?AC, LenA, LenB, LenC) is nondet.
%
% Too difficult to explain. See the Quintus docs. As far as I
% understand them the code below emulates this function just fine.
midstring(ABC, B, AC) :-
midstring(ABC, B, AC, _, _, _).
midstring(ABC, B, AC, LenA) :-
midstring(ABC, B, AC, LenA, _, _).
midstring(ABC, B, AC, LenA, LenB) :-
midstring(ABC, B, AC, LenA, LenB, _).
midstring(ABC, B, AC, LenA, LenB, LenC) :- % -ABC, +B, +AC
var(ABC), !,
atom_length(AC, LenAC),
( nonvar(LenA) ; nonvar(LenC)
-> plus(LenA, LenC, LenAC)
; true
),
sub_atom(AC, 0, LenA, _, A),
LenC is LenAC - LenA,
sub_atom(AC, _, LenC, 0, C),
atom_length(B, LenB),
atomic_list_concat([A,B,C], ABC).
midstring(ABC, B, AC, LenA, LenB, LenC) :-
sub_atom(ABC, LenA, LenB, LenC, B),
sub_atom(ABC, 0, LenA, _, A),
sub_atom(ABC, _, LenC, 0, C),
atom_concat(A, C, AC).
/*******************************
* EXCEPTIONS *
*******************************/
%% raise_exception(+Term)
%
% Quintus compatible exception handling
% raise_exception(Term) :-
% throw(Term).
%% on_exception(+Template, :Goal, :Recover)
:- meta_predicate
on_exception(+, 0, 0).
% on_exception(Except, Goal, Recover) :-
% catch(Goal, Except, Recover).