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yap-6.3/LGPL/chr/chr_swi.pl
vsc 5b6e8e742b more fixes 
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@2176 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2008-03-31 22:56:22 +00:00

439 lines
12 KiB
Prolog
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/* $Id: chr_swi.pl,v 1.6 2008-03-31 22:56:21 vsc Exp $
Part of CHR (Constraint Handling Rules)
Author: Tom Schrijvers and Jan Wielemaker
E-mail: Tom.Schrijvers@cs.kuleuven.be
WWW: http://www.swi-prolog.org
Copyright (C): 2003-2004, K.U. Leuven
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.
*/
%% SWI begin
:- module(chr,
[ op(1180, xfx, ==>),
op(1180, xfx, <=>),
op(1150, fx, constraints),
op(1150, fx, chr_constraint),
op(1150, fx, chr_preprocessor),
op(1150, fx, handler),
op(1150, fx, rules),
op(1100, xfx, \),
op(1200, xfx, @),
op(1190, xfx, pragma),
op( 500, yfx, #),
op(1150, fx, chr_type),
op(1150, fx, chr_declaration),
op(1130, xfx, --->),
op(1150, fx, (?)),
chr_show_store/1, % +Module
find_chr_constraint/1, % +Pattern
chr_trace/0,
chr_notrace/0,
chr_leash/1 % +Ports
]).
:- expects_dialect(swi).
:- if(current_prolog_flag(dialect, yap)).
:- hide(atomic_concat).
:- endif.
:- set_prolog_flag(generate_debug_info, false).
:- multifile user:file_search_path/2.
:- dynamic user:file_search_path/2.
:- dynamic chr_translated_program/1.
user:file_search_path(chr, library(chr)).
:- load_files([ chr(chr_translate),
chr(chr_runtime),
chr(chr_messages),
chr(chr_hashtable_store),
chr(chr_compiler_errors)
],
[ if(not_loaded),
silent(true)
]).
:- use_module(library(lists),[member/2]).
%% SWI end
%% SICStus begin
%% :- module(chr,[
%% chr_trace/0,
%% chr_notrace/0,
%% chr_leash/0,
%% chr_flag/3,
%% chr_show_store/1
%% ]).
%%
%% :- op(1180, xfx, ==>),
%% op(1180, xfx, <=>),
%% op(1150, fx, constraints),
%% op(1150, fx, handler),
%% op(1150, fx, rules),
%% op(1100, xfx, \),
%% op(1200, xfx, @),
%% op(1190, xfx, pragma),
%% op( 500, yfx, #),
%% op(1150, fx, chr_type),
%% op(1130, xfx, --->),
%% op(1150, fx, (?)).
%%
%% :- multifile user:file_search_path/2.
%% :- dynamic chr_translated_program/1.
%%
%% user:file_search_path(chr, library(chr)).
%%
%%
%% :- use_module('chr/chr_translate').
%% :- use_module('chr/chr_runtime').
%% :- use_module('chr/chr_hashtable_store').
%% :- use_module('chr/hprolog').
%% SICStus end
:- multifile chr:'$chr_module'/1.
:- dynamic chr_term/3. % File, Term
:- dynamic chr_pp/2. % File, Term
% chr_expandable(+Term)
%
% Succeeds if Term is a rule that must be handled by the CHR
% compiler. Ideally CHR definitions should be between
%
% :- constraints ...
% ...
% :- end_constraints.
%
% As they are not we have to use some heuristics. We assume any
% file is a CHR after we've seen :- constraints ...
chr_expandable((:- constraints _)).
chr_expandable((constraints _)).
chr_expandable((:- chr_constraint _)).
chr_expandable((:- chr_type _)).
chr_expandable((chr_type _)).
chr_expandable((:- chr_declaration _)).
chr_expandable(option(_, _)).
chr_expandable((:- chr_option(_, _))).
chr_expandable((handler _)).
chr_expandable((rules _)).
chr_expandable((_ <=> _)).
chr_expandable((_ @ _)).
chr_expandable((_ ==> _)).
chr_expandable((_ pragma _)).
% chr_expand(+Term, -Expansion)
%
% Extract CHR declarations and rules from the file and run the
% CHR compiler when reaching end-of-file.
%% SWI begin
extra_declarations([(:- use_module(chr(chr_runtime)))
,(:- style_check(-discontiguous)) % no need to restore; file ends
,(:- set_prolog_flag(generate_debug_info, false))
| Tail], Tail).
%% SWI end
%% SICStus begin
%% extra_declarations([(:-use_module(chr(chr_runtime)))
%% , (:- use_module(chr(hprolog),[term_variables/2,term_variables/3]))
%% , (:-use_module(chr(hpattvars)))
%% | Tail], Tail).
%% SICStus end
chr_expand(Term, []) :-
chr_expandable(Term), !,
prolog_load_context(file,File),
prolog_load_context(term_position,'$stream_position'(_, LineNumber, _, _, _)),
add_pragma_to_chr_rule(Term,line_number(LineNumber),NTerm),
assert(chr_term(File, LineNumber, NTerm)).
chr_expand(Term, []) :-
Term = ((:- chr_preprocessor Preprocessor)), !,
prolog_load_context(file,File),
assert(chr_pp(File, Preprocessor)).
chr_expand(end_of_file, FinalProgram) :-
extra_declarations(FinalProgram,Program),
prolog_load_context(file,File),
findall(T, retract(chr_term(File,_Line,T)), CHR0),
CHR0 \== [],
prolog_load_context(module, Module),
add_debug_decl(CHR0, CHR1),
add_optimise_decl(CHR1, CHR2),
CHR3 = [ (:- module(Module, [])) | CHR2 ],
findall(P, retract(chr_pp(File, P)), Preprocessors),
( Preprocessors = [] ->
CHR3 = CHR
; Preprocessors = [Preprocessor] ->
chr_compiler_errors:chr_info(preprocessor,'\tPreprocessing with ~w.\n',[Preprocessor]),
call_chr_preprocessor(Preprocessor,CHR3,CHR)
;
chr_compiler_errors:print_chr_error(error(syntax(Preprocessors),'Too many preprocessors! Only one is allowed!\n',[])),
fail
),
catch(call_chr_translate(File,
[ (:- module(Module, []))
| CHR
],
Program0),
chr_error(Error),
( chr_compiler_errors:print_chr_error(Error),
fail
)
),
delete_header(Program0, Program).
delete_header([(:- module(_,_))|T0], T) :- !,
delete_header(T0, T).
delete_header(L, L).
add_debug_decl(CHR, CHR) :-
member(option(Name, _), CHR), Name == debug, !.
add_debug_decl(CHR, CHR) :-
member((:- chr_option(Name, _)), CHR), Name == debug, !.
add_debug_decl(CHR, [(:- chr_option(debug, Debug))|CHR]) :-
( chr_current_prolog_flag(generate_debug_info, true)
-> Debug = on
; Debug = off
).
%% SWI begin
chr_current_prolog_flag(Flag,Val) :- current_prolog_flag(Flag,Val).
%% SWI end
add_optimise_decl(CHR, CHR) :-
\+(\+(memberchk((:- chr_option(optimize, _)), CHR))), !.
add_optimise_decl(CHR, [(:- chr_option(optimize, full))|CHR]) :-
chr_current_prolog_flag(optimize, full), !.
add_optimise_decl(CHR, CHR).
% call_chr_translate(+File, +In, -Out)
%
% The entire chr_translate/2 translation may fail, in which case we'd
% better issue a warning rather than simply ignoring the CHR
% declarations.
call_chr_translate(File, In, _Out) :-
( chr_translate_line_info(In, File, Out0) ->
nb_setval(chr_translated_program,Out0),
fail
).
call_chr_translate(_, _In, Out) :-
nb_current(chr_translated_program,Out), !,
nb_delete(chr_translated_program).
call_chr_translate(File, _, []) :-
print_message(error, chr(compilation_failed(File))).
call_chr_preprocessor(Preprocessor,CHR,_NCHR) :-
( call(Preprocessor,CHR,CHR0) ->
nb_setval(chr_preprocessed_program,CHR0),
fail
).
call_chr_preprocessor(_,_,NCHR) :-
nb_current(chr_preprocessed_program,NCHR), !,
nb_delete(chr_preprocessed_program).
call_chr_preprocessor(Preprocessor,_,_) :-
chr_compiler_errors:print_chr_error(error(preprocessor,'Preprocessor `~w\' failed!\n',[Preprocessor])).
%% SWI begin
/*******************************
* SYNCHRONISE TRACER *
*******************************/
:- multifile
user:message_hook/3,
chr:debug_event/2,
chr:debug_interact/3.
:- dynamic
user:message_hook/3.
user:message_hook(trace_mode(OnOff), _, _) :-
( OnOff == on
-> chr_trace
; chr_notrace
),
fail. % backtrack to other handlers
% chr:debug_event(+State, +Event)
%
% Hook into the CHR debugger. At this moment we will discard CHR
% events if we are in a Prolog `skip' and we ignore the
chr:debug_event(_State, _Event) :-
tracing, % are we tracing?
prolog_skip_level(Skip, Skip),
Skip \== very_deep,
prolog_current_frame(Me),
prolog_frame_attribute(Me, level, Level),
Level > Skip, !.
% chr:debug_interact(+Event, +Depth, -Command)
%
% Hook into the CHR debugger to display Event and ask for the next
% command to execute. This definition causes the normal Prolog
% debugger to be used for the standard ports.
chr:debug_interact(Event, _Depth, creep) :-
prolog_event(Event),
tracing, !.
prolog_event(call(_)).
prolog_event(exit(_)).
prolog_event(fail(_)).
/*******************************
* MESSAGES *
*******************************/
:- multifile
prolog:message/3.
prolog:message(chr(CHR)) -->
chr_message(CHR).
/*******************************
* TOPLEVEL PRINTING *
*******************************/
:- set_prolog_flag(chr_toplevel_show_store,true).
prolog:message(query(YesNo)) --> !,
['~@'-[chr:print_all_stores]],
'$messages':prolog_message(query(YesNo)).
prolog:message(query(YesNo,Bindings)) --> !,
['~@'-[chr:print_all_stores]],
'$messages':prolog_message(query(YesNo,Bindings)).
print_all_stores :-
( chr_current_prolog_flag(chr_toplevel_show_store,true),
catch(nb_getval(chr_global, _), _, fail),
chr:'$chr_module'(Mod),
chr_show_store(Mod),
fail
;
true
).
/*******************************
* MUST BE LAST! *
*******************************/
:- multifile user:term_expansion/2.
:- dynamic user:term_expansion/2.
user:term_expansion(In, Out) :-
chr_expand(In, Out).
%% SWI end
%% SICStus begin
%
% :- dynamic
% current_toplevel_show_store/1,
% current_generate_debug_info/1,
% current_optimize/1.
%
% current_toplevel_show_store(on).
%
% current_generate_debug_info(false).
%
% current_optimize(off).
%
% chr_current_prolog_flag(generate_debug_info, X) :-
% chr_flag(generate_debug_info, X, X).
% chr_current_prolog_flag(optimize, X) :-
% chr_flag(optimize, X, X).
%
% chr_flag(Flag, Old, New) :-
% Goal = chr_flag(Flag,Old,New),
% g must_be(Flag, oneof([toplevel_show_store,generate_debug_info,optimize]), Goal, 1),
% chr_flag(Flag, Old, New, Goal).
%
% chr_flag(toplevel_show_store, Old, New, Goal) :-
% clause(current_toplevel_show_store(Old), true, Ref),
% ( New==Old -> true
% ; must_be(New, oneof([on,off]), Goal, 3),
% erase(Ref),
% assertz(current_toplevel_show_store(New))
% ).
% chr_flag(generate_debug_info, Old, New, Goal) :-
% clause(current_generate_debug_info(Old), true, Ref),
% ( New==Old -> true
% ; must_be(New, oneof([false,true]), Goal, 3),
% erase(Ref),
% assertz(current_generate_debug_info(New))
% ).
% chr_flag(optimize, Old, New, Goal) :-
% clause(current_optimize(Old), true, Ref),
% ( New==Old -> true
% ; must_be(New, oneof([full,off]), Goal, 3),
% erase(Ref),
% assertz(current_optimize(New))
% ).
%
%
% all_stores_goal(Goal, CVAs) :-
% chr_flag(toplevel_show_store, on, on), !,
% findall(C-CVAs, find_chr_constraint(C), Pairs),
% andify(Pairs, Goal, CVAs).
% all_stores_goal(true, _).
%
% andify([], true, _).
% andify([X-Vs|L], Conj, Vs) :- andify(L, X, Conj, Vs).
%
% andify([], X, X, _).
% andify([Y-Vs|L], X, (X,Conj), Vs) :- andify(L, Y, Conj, Vs).
%
% :- multifile user:term_expansion/6.
%
% user:term_expansion(In, _, Ids, Out, [], [chr|Ids]) :-
% nonvar(In),
% nonmember(chr, Ids),
% chr_expand(In, Out), !.
%
%% SICStus end
%%% for SSS %%%
add_pragma_to_chr_rule((Name @ Rule), Pragma, Result) :- !,
add_pragma_to_chr_rule(Rule,Pragma,NRule),
Result = (Name @ NRule).
add_pragma_to_chr_rule((Rule pragma Pragmas), Pragma, Result) :- !,
Result = (Rule pragma (Pragma,Pragmas)).
add_pragma_to_chr_rule((Head ==> Body), Pragma, Result) :- !,
Result = ((Head ==> Body) pragma Pragma).
add_pragma_to_chr_rule((Head <=> Body), Pragma, Result) :- !,
Result = ((Head <=> Body) pragma Pragma).
add_pragma_to_chr_rule(Term,_,Term).
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