1		% (c) 2009-2025 Lehrstuhl fuer Softwaretechnik und Programmiersprachen,
2		% Heinrich Heine Universitaet Duesseldorf
3		% This software is licenced under EPL 1.0 (http://www.eclipse.org/org/documents/epl-v10.html)
4
5		:- module(specfile, [
6		specfile_possible_trans_name/2, specfile_possible_trans_name_for_successors/2,
7		specfile_trans/6,
8		prepare_state_for_specfile_trans/3, prepare_state_for_specfile_trans/4,
9		extract_infos_from_prepared_state/2,
10
11		property/2, elementary_prop/2,
12
13		partial_trans/4, specfile_trans_or_partial_trans/7,
14
15		animation_mode/1, set_animation_mode/1, add_animation_minor_mode/1,
16		animation_minor_mode/1, set_animation_minor_mode/1, remove_animation_minor_mode/0,
17		unset_animation_minor_modes/1, reset_animation_minor_modes/1,
18		b_mode/0, z_mode/0, b_or_z_mode/0, b_or_z_mode/1,
19		eventb_mode/0,
20		classical_b_mode/0,
21		csp_mode/0, csp_mode/1,
22		csp_with_bz_mode/0, z_or_tla_minor_mode/0,
23		process_algebra_mode/0,
24		xtl_mode/0,
25		b_syntax_available_for_source/0,
26
27		type_check_csp_and_b/0,
28
29		currently_opened_file/1, % only true for successfully opened files
30		currently_opened_file_status/2, % second parameter: success or failure
31		currently_opened_specification_name/1,
32		%reset_currently_opened_file/0,
33		set_currently_opened_file/1, set_currently_opened_b_file/1,
34		set_failed_to_open_file/1,
35		set_minor_animation_mode_from_file/1,
36		set_currently_opening_file/1,
37		set_currently_opened_package/1,
38		spec_file_has_been_successfully_loaded/0,
39		b_absolute_file_name_relative_to_opened_file/2,
40
41		state_corresponds_to_initialised_b_machine/1, state_corresponds_to_initialised_b_machine/2,
42		state_corresponds_to_fully_setup_b_machine/1, state_corresponds_to_fully_setup_b_machine/2,
43		state_corresponds_to_set_up_constants/1,
44		state_corresponds_to_set_up_constants/2, state_corresponds_to_set_up_constants_only/2,
45		extract_variables_from_state/2, extract_variables_from_state_as_primed/2,
46		current_b_expression/1,
47		get_current_state_for_b_formula/2, get_state_for_b_formula/3,
48
49		get_operation_name/2, get_operation_internal_name/2,
50		translate_operation_name/2,
51		get_operation_arguments/2, get_operation_return_values_and_arguments/3,
52		get_operation_description/2, get_operation_description_for_transition/4,
53		get_operation_description_for_transition_id/3,
54		build_up_b_real_operation/2,
55		expand_const_and_vars/3, expand_const_and_vars_to_full_store/2,
56		expand_to_constants_and_variables/3,
57
58		max_operations_zero_for_operation/1,
59		compute_operation_effect_max/6, % has replaced compute_operation_effect/5
60		create_setup_constants_operation/3,
61		get_internal_representation/1, get_internal_representation/4,
62		get_possible_event/1, get_feasible_event/1,
63		get_possible_language_specific_top_level_event/3,
64		get_specification_description/2,
65		get_local_state_for_operation_transition/3,
66		get_local_states_for_operation_transition/4, create_local_store_for_operation/4
67		]).
68
69		:- use_module(tools).
70
71		:- use_module(module_information).
72		:- module_info(group,animator).
73		:- module_info(description,'This module computes transitions and properties depending on the current animator mode.').
74
75		:- use_module(library(lists)).
76		%:- use_module(library(avl)).
77		%:- use_module(library(clpfd)).
78
79		:- use_module(debug).
80		:- use_module(b_interpreter).
81		:- use_module(preferences).
82		:- use_module(self_check).
83		:- use_module(error_manager).
84		:- use_module(translate).
85		:- use_module(succeed_max,[succeed_max_call_id/3]).
86
87		:- use_module(store,[empty_state/1]).
88		:- use_module(bmachine).
89		:- use_module(bsyntaxtree).
90		:- use_module(xtl_interface).
91
92
93		%% :- use_module(delay).
94
95		:- use_module(value_persistance, [load_constants/2]).
96
97		:- set_prolog_flag(double_quotes, codes).
98
99		/* --------------------------------- */
100
101
102
103
104		/* --------------------------------- */
105		/* ANIMATION & TEMPORAL VERIFICATION */
106		/* --------------------------------- */
107
108
109		:- dynamic animation_mode/1, animation_minor_mode/1.
110		% not marking as volatile; otherwise we startup with no animation_mode set
111		% not all parts of ProB can deal with this at the moment
112		%:- volatile animation_mode/1, animation_minor_mode/1.
113
114		animation_mode(b).
115		% possible values: b, csp, xtl, z, csp_and_b, promela
116		% animation_minor_mode: possible values alloy, event_b, tla, z (classical B if no animation_minor_mode fact)
117
118		b_mode :- animation_mode(X), (X=b ; X=csp_and_b).
119		z_mode :- animation_mode(X), (X=b ; X=csp_and_b), animation_minor_mode(z).
120	?	classical_b_mode :- b_mode, (animation_minor_mode(Mode) -> classical_minor_mode(Mode) ; true).
121		classical_minor_mode(rules_dsl).
122
123		eventb_mode :-
124		animation_mode(X), (X=b ; X=csp_and_b),
125		animation_minor_mode(eventb).
126		csp_with_bz_mode :- animation_mode(csp_and_b).
127		z_or_tla_minor_mode :- animation_minor_mode(X), (X=tla ; X=z).
128
129		csp_mode :- animation_mode(X), csp_mode(X).
130		csp_mode(cspm).
131		csp_mode(csp_and_b).
132
133		xtl_mode :- animation_mode(xtl).
134
135		b_or_z_mode :-
136		(animation_mode(X) -> (X=b -> true ; X=csp_and_b)). % basically the same as b_mode
137		b_or_z_mode(b). b_or_z_mode(csp_and_b).
138
139		% is B syntax (ASCII/Unicode available for source files)
140		b_syntax_available_for_source :-
141		b_or_z_mode,
142		(animation_minor_mode(X) -> X=event_b ; true).
143
144		process_algebra_mode :- %Note: also covers xtl (Promela, CCS interpreters; see test 756); used for translating events (tau, tick, io(...))
145		animation_mode(X), X \= b,
146		\+ ((X=xtl, xtl_get_definition_string('PROCESS_ALGEBRA_MODE',false))).
147
148		set_animation_mode(X) :-
149		retractall(animation_mode(_)),
150		remove_animation_minor_mode,
151		assertz(animation_mode(X)).
152
153		set_animation_minor_mode(X) :-
154		remove_animation_minor_mode,
155		assertz(animation_minor_mode(X)).
156		remove_animation_minor_mode :-
157		retractall(animation_minor_mode(_)).
158
159		% use to temporarily unset animation minor mode:
160		:- use_module(library(lists),[maplist/2]).
161		unset_animation_minor_modes(L) :- findall(X,retract(animation_minor_mode(X)),L).
162		reset_animation_minor_modes(L) :- maplist(add_animation_minor_mode,L).
163
164		add_animation_minor_mode(X) :-
165		(animation_minor_mode(X) -> true ; assertz(animation_minor_mode(X))).
166
167
168		:- dynamic currently_opened_file_status/2.
169		:- volatile currently_opened_file_status/2.
170		%currently_opened_file(none).
171
172		:- use_module(bmachine,[b_machine_name/1]).
173		currently_opened_specification_name(Name) :-
174		(b_or_z_mode -> b_machine_name(Name)
175		; currently_opened_file(File),
176		get_modulename_filename(File,Name)
177		).
178
179		reset_currently_opened_file :- retractall(currently_opened_file_status(_,_)).
180		reset_specfile :- reset_currently_opened_file,
181		retractall(animation_minor_mode(_)).
182		:- use_module(eventhandling,[register_event_listener/3]).
183		:- register_event_listener(clear_specification,reset_specfile,
184		'Reset Specfile Currently Opened File.').
185
186		% call if a spec was not loaded from file but from package (e.g., via socket / prob2)
187		set_currently_opened_package(Type) :-
188		set_currently_opened_file(package(Type)).
189
190		% indicates we are in the process of opening a file
191		set_currently_opening_file(File) :-
192		reset_currently_opened_file,
193		assertz(currently_opened_file_status(File,opening)),
194		set_minor_animation_mode_from_file(File).
195
196		:- use_module(tools,[get_filename_extension/2]).
197		set_minor_animation_mode_from_file(File) :-
198		get_filename_extension(File,Extension),
199		file_extension_mode(Extension,Major,Minor),!,
200		animation_mode(CurMajor),
201		(CurMajor=Major
202		-> (animation_minor_mode(CurMinor)
203		-> (CurMinor=Minor -> true
204		; add_warning(specfile,'Minor animation mode incompatible with file:',CurMinor:File)
205		)
206		; Minor=none -> true
207		; set_animation_minor_mode(Minor)
208		)
209		; add_warning(specfile,'Major animation mode incompatible with file:',CurMajor:File)
210		).
211		set_minor_animation_mode_from_file(File) :- add_warning(specfile,'Unknown file extension:',File).
212
213		:- use_module(probsrc(tools_platform), [host_platform/1]).
214		file_extension_mode(mch,b,none). % classical b, could also be csp_and_b
215		file_extension_mode(ref,b,none).
216		file_extension_mode(imp,b,none).
217		file_extension_mode(def,b,none).
218		file_extension_mode(sys,b,none).
219		file_extension_mode(rmch,b,rules_dsl).
220		file_extension_mode(prob,b,none). % Here we cannot infer the mode; TODO: in future store this info in the .prob file
221		file_extension_mode(tla,b,tla).
222		file_extension_mode(fuzz,b,z).
223		file_extension_mode(tex,b,z).
224		file_extension_mode(eventb,b,eventb).
225		file_extension_mode('P',xtl,none).
226		file_extension_mode('p',xtl,none) :- host_platform(windows),
227		add_message(specfile,'Lower-case file extension .p treated as .P for XTL mode').
228		file_extension_mode(als,b,alloy).
229		file_extension_mode(csp,cspm,none).
230		file_extension_mode(cspm,cspm,none).
231
232		% store currently openend specification file and set B minor animation mode
233		set_currently_opened_b_file(File) :-
234		set_currently_opened_file(File),
235		set_minor_animation_mode_from_file(File).
236
237		set_currently_opened_file(File) :-
238		reset_currently_opened_file,
239		assertz(currently_opened_file_status(File,success)).
240
241		set_failed_to_open_file(File) :-
242		reset_currently_opened_file,
243		assertz(currently_opened_file_status(File,failure)).
244
245		currently_opened_file(File) :- currently_opened_file_status(File,success).
246
247
248		:- use_module(tools,[safe_absolute_file_name/3, get_parent_directory/2]).
249		% open a file relateive to the main B file
250		b_absolute_file_name_relative_to_opened_file(File,AbsFileName) :-
251		currently_opened_file_status(MainFileName,_Status), % _Status=failure happens when error during loading
252		get_parent_directory(MainFileName,Directory),
253		safe_absolute_file_name(File,AbsFileName,[relative_to(Directory)]).
254
255		spec_file_has_been_successfully_loaded :- currently_opened_file(_).
256
257		:- use_module(bmachine,[b_machine_has_variables/0]).
258		% true if state corresponds to an initialised B machine
259		state_corresponds_to_initialised_b_machine(const_and_vars(_,_)) :- !,
260		b_or_z_mode.
261		state_corresponds_to_initialised_b_machine(expanded_const_and_vars(_,_,_,_)) :- !,
262		b_or_z_mode.
263		state_corresponds_to_initialised_b_machine(expanded_vars(_,_)) :- !,
264		b_or_z_mode.
265		state_corresponds_to_initialised_b_machine([]).
266		state_corresponds_to_initialised_b_machine([_|_]).
267		state_corresponds_to_initialised_b_machine(csp_and_b(_,BState)) :-
268		csp_with_bz_mode,
269		state_corresponds_to_initialised_b_machine(BState).
270
271
272		% check if state corresponds to an initialised B machine, and if so return expanded State
273		state_corresponds_to_initialised_b_machine(const_and_vars(ConstID,Vars),State) :- !,
274		b_or_z_mode, expand_const_and_vars(ConstID,Vars,State).
275		state_corresponds_to_initialised_b_machine(expanded_const_and_vars(_ConstID,_Vars,FullStore,_),State) :- !,
276		% generated by prepare_state_for_specfile_trans
277		State=FullStore.
278		state_corresponds_to_initialised_b_machine(expanded_vars(FullStore,_),State) :- !,
279		% generated by prepare_state_for_specfile_trans
280		State=FullStore.
281		state_corresponds_to_initialised_b_machine([],[]).
282		state_corresponds_to_initialised_b_machine([H|T],[H|T]).
283		state_corresponds_to_initialised_b_machine(csp_and_b(_,BState),State) :-
284		csp_with_bz_mode,
285		state_corresponds_to_initialised_b_machine(BState,State).
286
287		% check if all variables, constants setup; also allows concrete_constants if no variables exist
288		state_corresponds_to_fully_setup_b_machine(concrete_constants(_)) :- !, b_or_z_mode,
289		\+ b_machine_has_variables.
290		state_corresponds_to_fully_setup_b_machine(X) :- state_corresponds_to_initialised_b_machine(X).
291
292		state_corresponds_to_fully_setup_b_machine(concrete_constants(Constants),State) :- !, b_or_z_mode,
293		\+ b_machine_has_variables, State=Constants.
294		state_corresponds_to_fully_setup_b_machine(X,State) :- state_corresponds_to_initialised_b_machine(X,State).
295
296		% check if we only have constants, no variable values yet
297		state_corresponds_to_set_up_constants_only(root,State) :- !, animation_mode(b),
298		\+ b_machine_has_constants_or_properties, State=[]. % relevant for test 960
299		state_corresponds_to_set_up_constants_only(concrete_constants(Constants),State) :- !,
300		b_or_z_mode, State=Constants.
301		state_corresponds_to_set_up_constants_only(csp_and_b(_,BState),State) :- !,
302		csp_with_bz_mode,
303		state_corresponds_to_set_up_constants_only(BState,State).
304
305		state_corresponds_to_set_up_constants(const_and_vars(_,_)) :- !. % avoid expansion
306		state_corresponds_to_set_up_constants(X) :- state_corresponds_to_set_up_constants(X,_).
307
308		state_corresponds_to_set_up_constants(const_and_vars(ConstID,Vars),State) :- !,
309		b_or_z_mode, expand_const_and_vars(ConstID,Vars,State).
310		state_corresponds_to_set_up_constants(expanded_const_and_vars(_ConstID,_Vars,FullStore,_),State) :- !,
311		% generated by prepare_state_for_specfile_trans
312		State=FullStore.
313		state_corresponds_to_set_up_constants(expanded_vars(FullStore,_),State) :- !,
314		% generated by prepare_state_for_specfile_trans
315		State=FullStore.
316		state_corresponds_to_set_up_constants(concrete_constants(Constants),State) :- !,
317		b_or_z_mode, State=Constants.
318		state_corresponds_to_set_up_constants(csp_and_b(_,BState),State) :- !,
319		csp_with_bz_mode,
320		state_corresponds_to_set_up_constants(BState,State).
321		state_corresponds_to_set_up_constants([],State) :- !, State=[],
322		animation_mode(b).
323		state_corresponds_to_set_up_constants(State,RState) :-
324		animation_mode(b),
325		(State = root -> \+ b_machine_has_constants_or_properties,RState=[] ; RState=State).
326
327		:- use_module(state_space,[current_expression/2]).
328		current_b_expression(CurBState) :-
329		current_expression(_CurID,CurState),
330		state_corresponds_to_set_up_constants(CurState,CurBState).
331
332
333
334		:- use_module(state_space, [current_state_id/1]).
335		:- use_module(bmachine, [determine_type_of_formula/2]).
336		% get a state sufficient to evaluate a given formula (expression or predicate)
337		% it will give an error is the machine is not sufficiently initialised
338		get_current_state_for_b_formula(TypedExpr,BState) :-
339		current_state_id(CurID),
340		get_state_for_b_formula(CurID,TypedExpr,BState).
341		get_state_for_b_formula(StateID,TypedExpr,BState) :-
342		(formula_class(TypedExpr) -> Type=TypedExpr % user already provided formula class
343		; determine_type_of_formula(TypedExpr,Type)), % TODO: extract used ids and only expand those that are required
344		get_state(Type,StateID,TypedExpr,BState).
345
346		formula_class(requires_nothing).
347		formula_class(requires_constants).
348		formula_class(requires_variables).
349
350		:- use_module(probsrc(state_space),[get_constants_state_for_id/3]).
351		get_state(requires_nothing,_ID,_TE,[]).
352		get_state(requires_constants,StateID,TypedExpr,BState) :-
353		(get_constants_state_for_id(StateID,[allow_variable_list],BState) -> true
354		; ajoin(['Please setup constants first, cannot evaluate (in state ',StateID,') :'],Msg),
355		add_error(get_state,Msg,TypedExpr,TypedExpr),fail).
356		get_state(requires_variables,StateID,TypedExpr,BState) :-
357		my_visited_expression(StateID,State),
358		(state_corresponds_to_initialised_b_machine(State,BState) -> true ;
359		ajoin(['Please initialise machine first, cannot evaluate (in state ',StateID,') :'],Msg),
360		add_error(get_state,Msg,TypedExpr,TypedExpr),fail).
361		% TO DO: we could try and get only those identifiers that are really used
362
363		:- use_module(state_space,[visited_expression/2]).
364		my_visited_expression(root,S) :- !,
365		S=root. % ensure we succeed even if no state space set (e.g. when no machine provided to probcli)
366		my_visited_expression(StateID,State) :- visited_expression(StateID,State).
367
368		/* TRANSITIONS */
369
370		:- use_module(tools_meta,[call_residue/2]).
371		% ---------------------------------------------------
372
373
374		% Tries to find successor state for Op in State DB. Fails, if no solution is possible
375		% Input: State DB, Operation Op
376		% Output: DB2 the sucessor state
377		% Residue: Unfinished co-routines (should not happen!)
378		%specfile_trans(DB,Op,DB2,[]) :- !, specfile:i_transition(DB,Op,DB2).
379		specfile_trans(DB,OpName,Op,DB2,TransInfo,Residue) :-
380		% i_transition(DB,OpName,Op,DB2,TransInfo), Residue = []. % is faster, but no residue checking
381		animation_mode(MODE),
382	?	call_residue(i_transition(MODE,DB,OpName,Op,DB2,TransInfo),Residue).
383
384		i_transition(b,State,OpName,Op,NewState,TransInfo) :- !,
385	?	b_trans(State,OpName,Op,NewState,TransInfo).
386		i_transition(xtl,State,OpName,Op,NewState,TransInfo) :- !,
387	?	xtl_transition(State,Op,NewState,TransInfo), functor(Op,OpName,_).
388		i_transition(cspm,State,_OpName,Op,NewState,[]) :- !,
389		% Note: the OpName is ignored: we cannot make use of it
390	?	cspm_transition(State,Op,NewState).
391		%i_transition(promela,State,_OpName,Op,NewState,[]) :- !,
392		% promela_transition(State,Op,NewState).
393		% ; MODE=smv -> smv_transition(State,Op,NewState),TransInfo=[]
394		i_transition(csp_and_b,State,OpName,Op,NewState,TransInfo) :- !,
395		% Note: the OpName is either the name of a B operation or '$CSP' (or a variable)
396	?	csp_and_b_transition(State,OpName,Op,NewState,TransInfo).
397
398
399		% if you call specfile_trans multiple times for the same state, it is
400		% more efficient to call this predicate first once
401		prepare_state_for_specfile_trans(const_and_vars(ConstID,Vars),CurID,R) :- !, %print(expanding_const(ConstID)),nl,
402		R = expanded_const_and_vars(ConstID,Vars,FullStore,Infos),
403		expand_const_and_vars(ConstID,Vars,FullStore), %, print(full(FullStore)),nl.
404		prepare_infos(FullStore,CurID,Infos).
405		prepare_state_for_specfile_trans(FullStore,CurID,R) :- FullStore=[_|_],
406		prepare_infos(FullStore,CurID,Infos), Infos \=[],
407		!,
408		R = expanded_vars(FullStore,Infos).
409		prepare_state_for_specfile_trans(csp_and_b(CSP,BStore),CurID,csp_and_b(CSP,Res)) :- !,
410		prepare_state_for_specfile_trans(BStore,CurID,Res).
411		prepare_state_for_specfile_trans(X,_,X).
412
413		% a version with a memo argument to store expanded constants
414		prepare_state_for_specfile_trans(const_and_vars(ConstID,Vars),CurID,MEMO,R) :- !, %print(expanding_const(ConstID)),nl,
415		R = expanded_const_and_vars(ConstID,Vars,FullStore,Infos),
416		(nonvar(MEMO),MEMO = [ConstID/ConstantsStore]
417		% constants have already been previously extracted; e.g., in model_checker loop
418		-> %tools_printing:print_term_summary(memo(ConstID,ConstantsStore)),nl,
419		append(Vars,ConstantsStore,FullStore) % simply reuse expanded constants in MEMO
420		% used to be constants first, but has to be compatible with b_initialise_machine2 and expand_const_and_vars/3
421		; % expand_const_and_vars/3 inlined (so as to obtain ConstantsStore
422		visited_expression(ConstID,concrete_constants(ConstantsStore)), %% This can take a while if the Constants are big !
423		% print(no_memo(ConstID,MEMO)),tools_printing:print_term_summary(ConstantsStore),nl,
424		append(Vars,ConstantsStore,FullStore),
425		(var(MEMO)
426		-> MEMO=[ConstID/ConstantsStore] % store expanded constants to avoid unpacking again
427		; true)
428		), %, print(full(FullStore)),nl.
429		prepare_infos(FullStore,CurID,Infos).
430		prepare_state_for_specfile_trans(FullStore,CurID,_,R) :- FullStore=[_|_],
431		prepare_infos(FullStore,CurID,Infos), Infos \=[], !,
432		R = expanded_vars(FullStore,Infos).
433		prepare_state_for_specfile_trans(csp_and_b(CSP,BStore),CurID,MEMO,csp_and_b(CSP,Res)) :- !,
434		prepare_state_for_specfile_trans(BStore,CurID,MEMO,Res).
435		prepare_state_for_specfile_trans(X,_,_,X). % TODO: prepare infos as well if we have no constants
436
437		:- use_module(state_packing,[pack_state/2, get_packed_b_state_with_uncompressed_lists/2]).
438		% store some operation independent infos which are useful
439		prepare_infos(FullStore,CurID,Infos) :- CurID \= root,
440		(get_preference(try_operation_reuse,false)
441		-> Infos = []
442		% TO DO: check if we should enable this: get_preference(use_state_packing,true)
443		% TODO: we could check if there are operations which do not write all variables
444		; Infos=[packed_state/PackedList, state_id/CurID],
445		(CurID \= unknown, state_space:packed_visited_expression(CurID,PS),
446		get_packed_b_state_with_uncompressed_lists(PS,PackedList) % replace '$cst_vars' and compressed lists
447		-> true %,write('+')
448		; format('prepare_infos for state ~w: need to pack_values~n',[CurID]), % should ideally not happen
449		pack_state(FullStore,PS), % precompute state packing; will be re-used multiple times
450		get_packed_b_state_with_uncompressed_lists(PS,PackedList)
451		)
452		).
453
454		% extract pre-computed infos
455		extract_infos_from_prepared_state(expanded_const_and_vars(_,_,_,Infos),Res) :- !, Res=Infos.
456		extract_infos_from_prepared_state(expanded_vars(_,Infos),Res) :- !, Res=Infos.
457		extract_infos_from_prepared_state(_,[]).
458
459		remove_infos_from_prepared_state(expanded_const_and_vars(C,V,_,_),Res) :- !, Res=const_and_vars(C,V).
460		remove_infos_from_prepared_state(expanded_vars(V,_),R) :- !, R=V.
461		remove_infos_from_prepared_state(S,S).
462
463		% extract initialised variables from a state
464		extract_variables_from_state(const_and_vars(_,V),R) :- !,R=V.
465		extract_variables_from_state(expanded_const_and_vars(_,V,_,_),R) :- !,R=V.
466		extract_variables_from_state(expanded_vars(V,_),R) :- !,R=V.
467		extract_variables_from_state([],[]).
468		extract_variables_from_state([H|T],[H|T]).
469
470		:- use_module(probsrc(btypechecker),[prime_atom0/2]). % add $0 at end of variable
471		prime_binding(bind(ID,V),bind(PID,V)) :- prime_atom0(ID,PID).
472
473		extract_variables_from_state_as_primed(SrcState,PrimedVarBindings) :-
474		extract_variables_from_state(SrcState,VarVals),
475		maplist(prime_binding,VarVals,PrimedVarBindings).
476
477
478		/* can be attempted if trans fails to attempt to use partially computed transitions */
479		partial_trans(DB,Op,DB2,Residue) :-
480		call_residue(partial_i_transition(DB,Op,DB2),Residue).
481
482		partial_i_transition(root,'$partial_setup_constants',concrete_constants(ConstantsStore)) :-
483		animation_mode(b),
484		set_error_context(operation('$partial_setup_constants',root)),
485		b_interpreter:b_partial_set_up_concrete_constants(ConstantsStore).
486
487		% a predicate which automatically calls partial_trans :
488		specfile_trans_or_partial_trans(DB,OpName,Op,DB2,TransInfo,Residue,Partial) :-
489	?	if(specfile_trans(DB,OpName,Op,DB2,TransInfo,Residue),Partial=false,
490		(OpName='$setup_constants', % OpName is often an input argument here
491		TransInfo=[], Partial = true,
492		partial_trans(DB,Op,DB2,Residue))).
493
494		/* build up skeletons of possible operations; to be used before time_out call is made */
495		% currently only used in zmq worker.pl
496		specfile_possible_trans_name(State,OpName) :- animation_mode(MODE),
497		(MODE=b -> b_possible_trans_name(State,OpName)
498		; MODE = csp_and_b -> csp_b_possible_trans_name(State,OpName)
499		; setup_transition_skeleton(MODE,OpName) /* TO DO: add more possible skeletons */
500		).
501
502		% only set up skeletons if it is worth it for computing all successors
503		% e.g., currently it is not worth it to setup skeletons for either CSP or CSP||B (due to renaming,... we cannot predict which parts of a CSP process can be excluded)
504		specfile_possible_trans_name_for_successors(State,OpName) :- animation_mode(MODE),
505		(MODE=b
506	?	-> b_possible_trans_name(State,OpName)
507		; setup_transition_skeleton(MODE,OpName)
508		).
509
510		setup_transition_skeleton(_,_). /* TO DO: add more possible skeletons ? */
511
512		:- use_module(library(random)).
513		b_possible_trans_name(root,OpName) :- !,
514		(b_machine_has_constants_or_properties
515		-> OpName = '$setup_constants'
516		; OpName = '$initialise_machine').
517		b_possible_trans_name(concrete_constants(_),OpName) :- !, OpName = '$initialise_machine'.
518		b_possible_trans_name(_State,OpName) :-
519		(preferences:preference(randomise_operation_order,true),random(1,3,1)
520		-> b_machine_operation_names_in_reverse_order(OpName) ; true),
521		%b_get_machine_operation(OpName,_Res,_Params,_,_,_).
522	?	b_top_level_feasible_operation(OpName). % TO DO: we could link also with cbc feasibility analysis if carried out
523		% we could check: b_operation_cannot_modify_state(OpName) given a preference, in particular for SAFETY_MODEL_CHECK when operation already covered
524
525		csp_b_possible_trans_name(csp_and_b_root,OpName) :- !,
526		(b_machine_has_constants_or_properties
527		-> OpName = 'tau($setup_constants)'
528		; OpName = 'tau($initialise_machine)').
529		csp_b_possible_trans_name(concrete_constants(_),OpName) :- !,
530		OpName = 'tau($initialise_machine)'.
531		csp_b_possible_trans_name(State,OpName) :-
532		b_possible_trans_name(State,OpName).
533		% TO DO: add non-synchronised channels
534
535		% --------------
536
537		:- use_module(probcspsrc(haskell_csp),[channel_type_list/2, symbol/4]).
538		:- use_module(debug).
539		% check whether a currently open CSP is type compatible with a loaded B machine
540		type_check_csp_and_b :- animation_mode(csp_and_b), debug_println(9,type_check_csp_and_b),
541	?	b_get_machine_operation(ChannelOpName,Res,Params,_,_,_), append(Params,Res,ParamsRes),
542		channel_type_list(ChannelOpName,CSPTypeList),
543		% TO DO: also check B variable names which match channel name
544		debug_println(9,checking_synchronised_channel(ChannelOpName,ParamsRes,CSPTypeList)),
545		l_check_compatibility(ParamsRes,CSPTypeList,ChannelOpName),
546		fail.
547		type_check_csp_and_b.
548
549		%convert_csp_type_to_list(type(T),R) :- convert_csp_type_to_list2(T,R).
550		%convert_csp_type_to_list2(dotUnitType,[]).
551		%convert_csp_type_to_list2(dotTupleType(T),T).
552
553		l_check_compatibility([],[],_) :- !.
554		l_check_compatibility([B|BT],[CSP|CSPT],ChannelOpName) :- !, check_compatibility(B,CSP,ChannelOpName),
555		l_check_compatibility(BT,CSPT,ChannelOpName).
556		l_check_compatibility([],CSP,ChannelOpName) :- !,
557		add_error(type_check_csp_and_b,'CSP Channel has too many parameters: ', ChannelOpName:CSP).
558		l_check_compatibility(B,[],ChannelOpName) :- !,
559		print('* CSP Channel has too few parameters: '), print(ChannelOpName),nl,
560		print('* B Arguments will be ignored: '), l_print_bexpr_or_subst(B),nl.
561		%add_error(type_check_csp_and_b,'CSP Channel has too few parameters: ', ChannelOpName:B).
562
563		check_compatibility(b(identifier(ID),TYPE,INFO),CSP_TYPE,ChannelOpName) :- !,
564		(type_ok(TYPE,CSP_TYPE) -> true ;
565		% TO DO: pretty print B and CSP Types
566		add_error(type_check_csp_and_b,'Incompatible types between B and CSP: ',ChannelOpName:ID:(TYPE:CSP_TYPE),b(identifier(ID),TYPE,INFO))
567		).
568		check_compatibility(B,CSP,ChannelOpName) :- !,
569		add_internal_error('Illegal types: ',check_compatibility(B,CSP,ChannelOpName)).
570
571		% TO DO: needs to be refined much more;
572		type_ok(Type,CSPType) :-
573		(type_ok2(Type,CSPType) -> true
574		; add_error(type_check_csp_and_b,'Cannot be converted (B:CSP): ',Type:CSPType),fail).
575		type_ok2(boolean,X) :- !, is_csp_boolean_type(X).
576		type_ok2(integer,X) :- !, is_csp_integer_type(X).
577		type_ok2(string,CSP) :- !,is_csp_global_set_type(CSP,string).
578		type_ok2(set(T),CSP) :- !, is_csp_set_type(CSP,T).
579		% TO DO: what if we have set(couple(integer,T)) instead of seq(T) ?
580		% rye
581		% check set(couple(integer,T)) (seq type) in B
582		type_ok2(seq(T),CSP) :- !, is_csp_seq_type(CSP,T).
583		type_ok2(couple(A,B),CSP) :- !, is_csp_couple_type(CSP,A,B).
584		type_ok2(global(GS),CSP) :- !,is_csp_global_set_type(CSP,GS).
585		type_ok2(X,Y) :- print(unkown(X,Y)),nl.
586
587		is_csp_couple_type(setValue([na_tuple([A|Rest])|_]),TA,TB) :- type_ok(TA,setValue([A])),
588		check_rest_couple_els(Rest,TB).
589		is_csp_couple_type(typeTuple([A|Rest]),TA,TB) :- type_ok(TA,A), check_rest_couple(Rest,TB).
590
591		check_rest_couple_els([B],TB) :- !, type_ok(TB,setValue([B])).
592		check_rest_couple_els([B1|BRest],couple(TB1,TBRest)) :- type_ok(TB1,setValue([B1])),
593		check_rest_couple_els(BRest,TBRest).
594		check_rest_couple([B],TB) :- !, type_ok(TB,B).
595		check_rest_couple([B1|BRest],couple(TB1,TBRest)) :- type_ok(TB1,B1),
596		check_rest_couple(BRest,TBRest).
597
598		% rye
599		% check if it is couple(integer, T) type and return T in 2nd arguments
600		couple_int(couple(integer, T), T). % possible sequence
601
602		% rye: it's not correct to check only Head
603		% % for example, for CSP type, {{}, {(1,2),(2,3)}}. Its head is emptyset, but the second one is set of tuple
604		is_csp_set_type('Set'([H|_]),Type) :- type_ok(Type,H). % just check Head
605		% check the 2nd element in set in case the 1st is emptyset
606		is_csp_set_type(setValue([_|T]),Type) :-
607		T = [H1 | _], !,
608		% if it is set(couple(integer, T)), it can be a sequence type
609		(couple_int(Type, TH1) -> is_csp_seq_type(setValue(T), TH1)
610		; type_ok(Type,H1)
611		). % check the 2nd
612		% if it is only one element in set, just check the head
613		is_csp_set_type(setValue([H|T]),Type) :-
614		(couple_int(Type, TH1) -> is_csp_seq_type(setValue([H|T]), TH1)
615		; type_ok(Type,H)
616		). % just check Head
617
618		is_csp_seq_type('Seq'(H),Type) :- type_ok(Type,H).
619		is_csp_seq_type(setValue([H|_]),Type) :- H=list(L), is_csp_list(L,Type).
620		is_csp_list([],_).
621		is_csp_list([H|_],Type) :- type_ok(Type,setValue([H])).
622
623		is_csp_boolean_type(boolType).
624		is_csp_boolean_type(setValue([H|_])) :- is_csp_boolean_value(H).
625		is_csp_boolean_value(true).
626		is_csp_boolean_value(false).
627
628		is_csp_integer_type(intType).
629		is_csp_integer_type(setFromTo(_,_)).
630		is_csp_integer_type(setFrom(_)).
631		is_csp_integer_type(setValue([int(_)|_])).
632
633		is_csp_global_set_type(dataType(_),_GS). % TO DO CHECK MEMBERS
634		is_csp_global_set_type(setValue([]),_GS). % TO DO CHECK MEMBERS
635		is_csp_global_set_type(setValue([_|_]),_GS). % TO DO CHECK MEMBERS
636
637		% --------------
638
639
640		:- use_module(bmachine,[b_get_machine_operation/4]).
641		:- use_module(bsets_clp,[tuple_of/3]).
642		% compute transitions for a CSP || B specification
643		% Note: the OpName is either the name of a B machine operation (even if hidden) or '$CSP' (useful for ltsmin)
644		csp_and_b_transition(root,OpName,Op,NewState,TransInfo) :- !,
645		Op = start_cspm_MAIN, OpName=Op, NewState = csp_and_b_root,TransInfo = [].
646		csp_and_b_transition(csp_and_b_root,OpName,Trans,NewState,TransInfo) :- !,
647		Trans = tau(Op), OpName = '$CSP',
648	?	b_trans(root,_,Op,InitialBState,TransInfo),
649		(InitialBState = concrete_constants(_)
650		-> NewState = InitialBState
651		; csp_initialisation_for_b(InitialCSPState),
652		NewState = csp_and_b(InitialCSPState,InitialBState)
653		).
654		csp_and_b_transition(concrete_constants(C),OpName,Trans,NewState,TransInfo) :- !,
655		Trans = tau(Op), OpName = '$CSP',
656		b_trans(concrete_constants(C),_,Op,InitialBState,TransInfo),
657		csp_initialisation_for_b(InitialCSPState),
658		NewState = csp_and_b(InitialCSPState,InitialBState).
659		csp_and_b_transition(csp_and_b(CSPState,BState),OpName,EventVisibleToUser,csp_and_b(NewCSP,NewB),TransInfo) :-
660		!,
661	?	csp_transition_for_b(CSPState,ChOpName,ChArgs,CSPAction,NewCSP),
662		% TO DO: split up csp_transition_for_b: into two parts; second part converts datatypes and only called if linking op exists
663		%% print(csp_trans(ChOpName,ChArgs)),nl, %%
664		length(ChArgs,Len), length(OpArgs,Len),
665	?	b_transition_for_csp(ChOpName,CSPAction,ChArgs,OpArgs,BState,OpName,Operation,NewB,TransInfo),
666	?	hide_csp_event(CSPAction,Operation,EventVisibleToUser).
667		csp_and_b_transition(State,'$CSP',Op,NewState,[]) :-
668		% we have a pure CSP state: use CSP-M transition
669	?	cspm_transition(State,Op,NewState).
670
671		:- use_module(bmachine,[b_is_variable/1,b_is_constant/1]).
672		% compute the B counterpart for a CSP transition:
673		b_transition_for_csp(ChOpName,_CSPAction,ChArgs,OpArgs,BState,OpName,Operation,NewB,TransInfo) :-
674	?	build_up_b_operation_for_csp(ChOpName,OpArgs,Operation),
675		!,
676		OpName = ChOpName,
677		%% print_message(trying_b_trans(Operation,ChArgs,OpArgs)), %%
678		(get_preference(try_operation_reuse,false)
679		-> generate_b_operationargs_from_csp(ChArgs,OpArgs),
680	?	b_trans(BState,OpName,Operation,NewB,TransInfo)
681		;
682		% compute B transition without parameters so that we can cache
683	?	b_trans(BState,OpName,Operation,NewB,TransInfo),
684		% and unify afterwards
685		generate_b_operationargs_from_csp(ChArgs,OpArgs)
686		).
687		%%, print_message(csp_btrans(Operation)), %%.
688		b_transition_for_csp(ChOpName,_CSPAction,ChArgs,OpArgs,BState,OpName,Operation,NewB,TransInfo) :-
689		OpName = ChOpName,
690		(b_is_variable(ChOpName) ; b_is_constant(ChOpName)),
691		%% print(probing(ChOpName)),nl,
692		expand_const_and_vars_to_full_store(BState,FBState),
693		try_lookup_value_in_store_and_global_sets(ChOpName,FBState,IdValue),
694		!,
695		remove_infos_from_prepared_state(BState,NewB),
696		TransInfo=[],
697		/* interpret as probing operation: get value of var,cst,SET */
698		generate_b_operationargs_from_csp(ChArgs,OpArgs),
699		(OpArgs=[SingleVal]
700		-> SingleVal = IdValue, Operation='-->'(ChOpName,[IdValue])
701		; OpArgs=[Val1,Val2],
702		tuple_of(Val1,Val2,IdValue), /* from bsets_clp, use exact_element_of ??? */
703		OpCall =.. [ChOpName,Val1],
704		Operation='-->'(OpCall,[Val2])
705		).
706		b_transition_for_csp(_ChOpName,CSPAction,_ChArgs,_OpArgs,BState,OpName,Operation,NewB,TransInfo) :-
707		OpName = '$CSP', % all CSP events grouped together
708		remove_infos_from_prepared_state(BState,NewB),
709		TransInfo=[],
710		/* no B operation of the name; could be tau or tick or extra comm channel */
711		%Op1 =.. [ChOpName|OpArgs],
712		Operation = CSPAction. % removed csp(.) wrapper [for LTL model checker]
713
714		hide_csp_event(CSPAction,_,EventVisibleToUser) :-
715		symbol('HIDE_CSPB',_,Span,_),!, % if there is a HIDE_CSPB definition then we do MAIN [{| HIDE_CSPB |}] B_MACHINE \ {| HIDE_CSPB |}
716		haskell_csp:evaluate_argument(val_of('HIDE_CSPB',Span),EvCList),
717		% print(hide(EvCList,CSPAction)),nl,
718		haskell_csp:expand_channel_pattern_expression(EvCList,ECList,no_loc_info_available),
719	?	haskell_csp:cspm_hide_action(CSPAction,omega,ECList, Span, EventVisibleToUser,_).
720		hide_csp_event(_CSPAction,Operation,EventVisibleToUser) :-
721		% get_preference(csp_event_visible_to_user,true) -> EventVisibleToUser = CSPAction
722		EventVisibleToUser = Operation.
723
724		build_up_b_operation_for_csp(OpName,OpArgs,Operation) :- %print(csp(OpName,OpArgs,Operation)),nl,
725		nonvar(OpName),
726		b_get_machine_operation(OpName,Res,Params,_), %print(get_machine_op(OpName,Res,Params)),nl,
727	?	specfile:generate_args(OpArgs,Params,Res, BArgs,BResults,OpName), %print(gen_args(BArgs,BResults)),nl,
728		% TO DO: either also extract types from Params, Res or better write a static checker that tests that the B operation and CSP channel types are compatible
729		safe_univ(Op1,[OpName|BArgs]), %print(op1(Op1)),nl,
730		(BResults = [] -> Operation = Op1 ; Operation = '-->'(Op1,BResults)).
731
732		:- use_module(bmachine,[b_get_machine_operation_for_animation/6]).
733		build_up_b_real_operation(OpName,Operation) :-
734		b_get_machine_operation_for_animation(OpName,Res,Params,_,_,true), %true==TopLevel
735		length(Params,Len), length(OpArgs,Len),
736		length(Res,RLen), length(BResults,RLen),
737		safe_univ(Op1,[OpName|OpArgs]),
738		(BResults = [] -> Operation = Op1 ; Operation = '-->'(Op1,BResults)).
739
740		generate_args([],[],Res,[],BRes,_) :- length(Res,L), length(BRes,L).
741		generate_args([],[_Param|T],Res,[_|TA],BRes,OpName) :-
742	?	generate_args([],T,Res,TA,BRes,OpName).
743		generate_args([CSPArg|TC],[Param|T],Res,[CSPArg|TA],BRes,OpName) :- check_type_for_id(CSPArg,Param,OpName),
744	?	generate_args(TC,T,Res,TA,BRes,OpName).
745		generate_args([CSPArg|TC],[],[ReturnParam|TRes],[],[CSPArg|TBRes],OpName) :-
746		check_type_for_id(CSPArg,ReturnParam,OpName),
747	?	generate_args(TC,[],TRes,[],TBRes,OpName).
748		generate_args([H|T],[],[],[],[],OpName) :-
749		add_error(specfile,'CSP provides extra arguments: ',OpName:[H|T]).
750
751		check_type_for_id(Val,TID,OpName) :- get_texpr_type(TID,Type),
752		check_type(Type,Val,OpName:TID).
753
754		:- block check_type(?,-,?).
755		check_type(boolean,pred_true,_) :- !.
756		check_type(boolean,pred_false,_) :- !.
757		check_type(integer,int(_),_) :- !.
758		check_type(string,string(_),_) :- !.
759		check_type(global(GS),fd(_,GS),_) :- !.
760		check_type(couple(A,B),(VA,VB),OID) :- !, check_type(A,VA,OID), check_type(B,VB,OID).
761		check_type(set(_T),[],_) :- !.
762		check_type(set(_T),closure(_,_,_),_) :- !. % TO DO: check type signature of closure
763		check_type(set(T),[H|_],OID) :- !, check_type(T,H,OID).
764		check_type(set(T),avl_set((node(Y,_,_,_L,_R))),OID) :- !, check_type(T,Y,OID).
765		check_type(seq(T),V,OID) :- !, check_type(set(couple(integer,T)),V,OID).
766		% TO DO: record, freetype ; but do not appear in translation from CSP to B yet
767		check_type(Type,Value,OpName:TID) :-
768		def_get_texpr_id(TID,ID),
769		add_error(check_type_for_id,'Illegal CSP value for argument: ',OpName:ID:type(Type):value(Value)),
770		fail.
771
772		get_operation_internal_name(Op,Name) :- var(Op),!,
773		add_error(get_operation_internal_name,'Variable Transition: ',Op), Name=Op.
774		get_operation_internal_name('$initialise_machine',N) :- !, N='$initialise_machine'.
775		get_operation_internal_name('$setup_constants',N) :- !, N='$setup_constants'.
776		get_operation_internal_name('$partial_setup_constants',N) :- !, N='$partial_setup_constants'.
777		get_operation_internal_name(Op,Name) :- get_operation_name(Op,Name).
778
779		is_setup_constants_internal_name('$setup_constants').
780		is_setup_constants_internal_name('$partial_setup_constants').
781
782		% tool to get the basic operation/channel/event name of a transition:
783		get_operation_name(Op,Name) :- var(Op),!, add_error(get_operation_name,'Variable Transition: ',Op), Name=Op.
784		get_operation_name('-->'(F,_),N) :- !, functor(F,N,_).
785		%get_operation_name(io([Action|_],proc(_Nr,_PROC),_SPAN),F) :-
786		% animation_mode(promela),!,functor(Action,F,_).
787		get_operation_name(io(_V,Ch,_SPAN),N) :- csp_mode,!, functor(Ch,N,_).
788		get_operation_name(FullOperation,Name) :- functor(FullOperation,Functor,_),
789		translate_operation_name(Functor,Name).
790
791		get_operation_arguments(Op,Args) :- var(Op),!, add_error(get_operation_arguments,'Variable Transition: ',Op), Args=[].
792		get_operation_arguments('-->'(F,_ReturnValues),Args) :- !, F =.. [_|Args].
793		%get_operation_arguments(io([_Action|V],proc(_Nr,_PROC),_SPAN),Args) :-
794		% animation_mode(promela),!,Args=V.
795		get_operation_arguments(io(V,_Ch,_SPAN),Args) :- csp_mode,!, Args = V.
796		get_operation_arguments(FullOperation,Args) :- FullOperation =.. [_|Args].
797
798		get_operation_return_values_and_arguments('-->'(F,ReturnValues),ReturnValues,Args) :- !,
799		F =.. [_|Args].
800		get_operation_return_values_and_arguments(Op,[],Args) :- get_operation_arguments(Op,Args).
801
802		translate_operation_name('$initialise_machine',T) :- !,T='INITIALISATION'.
803		translate_operation_name('$setup_constants',T) :- !,T='SETUP_CONSTANTS'.
804		translate_operation_name('$partial_setup_constants',T) :- !,T='PARTIAL_SETUP_CONSTANTS'.
805		%translate_operation_name(InternalName,Res) :- !, Res=InternalName.
806		translate_operation_name(X,X).
807
808		:- use_module(bmachine,[b_get_operation_description/2]).
809		% get a textual description of a transition, based on description pragma
810		get_operation_description(OpTerm,Desc) :- b_or_z_mode,
811		get_operation_name(OpTerm,OpName),
812		b_get_operation_description(OpName,Desc).
813		% in future we could possible use operation parameter values to adapt description
814
815		:- use_module(state_space,[transition/4,transition_info/2]).
816		get_operation_description_for_transition_id(StateId,TransitionId,Desc) :-
817		transition(StateId,OpTerm,TransitionId,NextId), !,
818		(xtl_mode % TODO: allow other modes?
819		-> transition_info(TransitionId,description(Desc))
820		; get_operation_description_for_transition(StateId,OpTerm,NextId,Desc)
821		).
822		get_operation_description_for_transition_id(StateId,TransitionId,_) :-
823		format('No transition from state ~w with id ~w!~n', [StateId,TransitionId]),
824		fail.
825
826		:- use_module(probsrc(b_interpreter),[b_compute_explicit_epression_no_wf/6]).
827		:- use_module(probsrc(bmachine),[get_operation_description_template_expr/2]).
828		% get a description for operation from a given state; to do: we could provide destination state
829		get_operation_description_for_transition(StateId,OpTerm,NextId,Desc) :- xtl_mode, !,
830		transition(StateId,OpTerm,TransitionId,NextId),
831		transition_info(TransitionId,description(Desc)).
832		get_operation_description_for_transition(StateId,OpTerm,NextId,Desc) :- b_or_z_mode,
833		get_operation_name(OpTerm,OpName),
834		get_operation_description_template_expr(OpName,TemplateStringExpr),
835		visited_expression(NextId,State),
836		state_corresponds_to_initialised_b_machine(State,BState1),
837		visited_expression(StateId,BeforeState),
838		state_corresponds_to_initialised_b_machine(BeforeState,BState0),
839		extract_variables_from_state_as_primed(BState0,PrimedBefore),
840		append(PrimedBefore,BState1,BState),
841
842		% TODO: use NextId and add StateId as $0 vars
843		% maplist(create_primed_binding,InVariablesState,PrimedVars),
844		% append(PrimedVars,Out,PredState),
845		!,
846		get_local_state_for_operation_transition(OpName,OpTerm,LocalState),
847		%write(local_state(OpName,OpTerm,LocalState)),nl,
848		% TODO: process errors better
849		if(b_compute_explicit_epression_no_wf(TemplateStringExpr,LocalState,BState,string(SD),
850		operation_description(OpName),0),
851		Desc=SD,
852		(get_operation_description(OpTerm,D), ajoin(['Error evaluating template: ',D],Desc))
853		).
854		get_operation_description_for_transition(_StateId,OpTerm,_NextStateId,Desc) :-
855		get_operation_description(OpTerm,Desc).
856
857		get_local_state_for_operation_transition(OpName,OperationTerm,LocalState) :-
858		get_local_states_for_operation_transition(OpName,OperationTerm,ParaStore,ResultStore),
859		append(ResultStore,ParaStore,LocalState).
860
861		% get local states for parameter values and result values extracted from a B operation transition term
862		get_local_states_for_operation_transition(OpName,OperationTerm,ParaStore,ResultStore) :- b_or_z_mode,!,
863		get_operation_return_values_and_arguments(OperationTerm,ReturnValues,ParaValues),
864	?	(b_get_machine_operation_for_animation(OpName,Results,Parameters,_Body,_OType,_TopLevel,OpPos)
865		-> true
866		; is_setup_constants_internal_name(OpName) -> Results=[], Parameters=[], OpPos=unknown
867		; add_error(specfile,'Unrecognized operation: ',OpName),
868		Results=[], Parameters=[], OpPos=unknown
869		),
870		def_get_texpr_ids(Parameters,OpParameterNames), % also includes virtual parameters (show_eventb_any_arguments)
871		(ParaValues=[]
872		-> ParaStore=[]
873		; (OpParameterNames=[], ParaValues=[_|_]
874		-> (get_preference(show_eventb_any_arguments,true)
875		-> add_message(specfile,'Ignoring additional parameters for:',OpName,OpPos)
876		; add_warning(specfile,'Ignoring additional parameters for:',OpName,OpPos)
877		),
878		ParaStore = []
879		; create_local_store_for_operation(OpParameterNames,ParaValues,OpName,ParaStore)
880		)
881		),
882		(ReturnValues=[]
883		-> ResultStore = []
884		; %b_get_machine_operation_result_names(OpName,OpResults),
885		def_get_texpr_ids(Results,OpResults),
886		create_local_store_for_operation(OpResults,ReturnValues,OpName,ResultStore)
887		).
888		get_local_states_for_operation_transition(OpName,OperationTerm,ParaStore,ResultStore) :- xtl_mode,
889		xtl_transition_parameters(OpName,ParaNames), !, % user-defined parameters found, otherwise use default params below
890		get_operation_return_values_and_arguments(OperationTerm,_ReturnValues,ParaValues), % ReturnValues should always be []
891		ResultStore = [],
892		maplist(gen_id_bind,ParaNames,ParaValues,ParaStore).
893		get_local_states_for_operation_transition(_OpName,OperationTerm,ParaStore,ResultStore) :- % not B mode or no user-defined params available in XTL mode
894		ResultStore = [],
895		get_operation_return_values_and_arguments(OperationTerm,ReturnValues,ParaValues),
896		ReturnValues = [], % should always succeed
897		gen_para_bind(ParaValues,1,ParaStore). % create [bind(para1,Val1),...]
898
899		gen_id_bind(ID,Val,bind(ID,Val)).
900
901		gen_para_bind([],_,[]).
902		gen_para_bind([H|T],Nr,[bind(ParaNr,H)|BT]) :- ajoin([para,Nr],ParaNr),
903		N1 is Nr+1,
904		gen_para_bind(T,N1,BT).
905
906		% create a store from parameter names and values:
907		create_local_store_for_operation([],[],_,Store) :- !, Store=[].
908		create_local_store_for_operation([Name|NT],[Val|VT],OpName,[bind(Name,Val)|StoreT]) :- !,
909		create_local_store_for_operation(NT,VT,OpName,StoreT).
910		create_local_store_for_operation([Name|NT],[],OpName,Store) :- !,
911		ajoin(['Missing values for operation ',OpName,':'],Msg),
912		add_error(specfile,Msg,[Name|NT]),
913		Store = [].
914		create_local_store_for_operation(_,V,OpName,Store) :-
915		ajoin(['Too many values for operation ',OpName,':'],Msg),
916		add_error(specfile,Msg,V),
917		Store = [].
918
919		:- use_module(library(between),[between/3]).
920
921		b_trans(State,OpName,Operation,NewState,PathInfo) :-
922	?	compute_operation_effect_max(State,OpName,Operation,NewState,PathInfo,_Max).
923
924		:- use_module(store,[store_updates_and_normalise/3]).
925
926		compute_operation_effect_max([],OpName,Operation,NewState,PathInfo,Max) :-
927	?	compute_operation_updates_on_expanded_store([],OpName,Operation,Updates,PathInfo,Max),
928		store_updates_and_normalise(Updates,[],NewState).
929		compute_operation_effect_max([H|T],OpName,Operation,NewState,PathInfo,Max) :-
930	?	compute_operation_updates_on_expanded_store([H|T],OpName,Operation,Updates,PathInfo,Max),
931		store_updates_and_normalise(Updates,[H|T],NewState).
932		compute_operation_effect_max(const_and_vars(ConstID,Vars),OpName,Operation,ResultingStore,PathInfo,Max) :-
933		prepare_state_for_specfile_trans(const_and_vars(ConstID,Vars),unknown,R),
934		%print(expanded_const_and_vars(ConstID)),nl,
935		compute_operation_effect_max(R,OpName,Operation,ResultingStore,PathInfo,Max).
936		compute_operation_effect_max(expanded_const_and_vars(ID,Vars,FullStore,Infos),OpName,Operation,NewState,PathInfo,Max) :-
937	?	compute_operation_updates_on_expanded_store(expanded_const_and_vars(ID,Vars,FullStore,Infos),
938		OpName,Operation,Updates,PathInfo,Max),
939		NewState = const_and_vars(ID,NewVars),
940		store_updates_and_normalise(Updates,Vars,NewVars).
941		compute_operation_effect_max(expanded_vars(FullStore,Infos),OpName,Operation,NewState,PathInfo,Max) :-
942	?	compute_operation_updates_on_expanded_store(expanded_vars(FullStore,Infos),
943		OpName,Operation,Updates,PathInfo,Max),
944		store_updates_and_normalise(Updates,FullStore,NewState).
945
946		compute_operation_effect_max(concrete_constants(ConstantsStore),'$initialise_machine',OpInit,ResultingStore,PathInfo,Max) :-
947		get_max_enablings_for_init(Max,'$initialise_machine',MaxForCall),
948	?	succeed_max_call_id('$initialise_machine',
949		b_interpreter:b_initialise_machine(ConstantsStore,InitialVars,InitialStore,PathInfo),MaxForCall),
950		create_initialisation_operation(InitialVars,OpInit),
951		(\+ preferences:preference(symmetry_mode,flood), /* TO DO : improve permutation to allow using const_and_vars optimisation */
952	?	visited_expression(ConstID,concrete_constants(ConstantsStore))
953		-> ResultingStore = const_and_vars(ConstID,InitialVars) /* avoid storing constant values again */
954		; ResultingStore = InitialStore).
955		compute_operation_effect_max(root,'$setup_constants',OpSetup,concrete_constants(FilteredConstantsStore),[],Max) :-
956		b_machine_has_constants_or_properties,
957		get_max_enablings_for_init(Max,'$setup_constants',MaxForCall),
958	?	compute_constants(ConstantsStore,MaxForCall,Complete),
959		create_setup_constants_operation(ConstantsStore,Complete,OpSetup),
960		%%print_message('FOUND_CONSTANTS'(OpName)),
961		(get_preference(filter_unused_constants,true) % possibly disable if VisB or Custom Graph Definitions exist
962		-> exclude(unused_binding,ConstantsStore,FilteredConstantsStore)
963		; FilteredConstantsStore=ConstantsStore).
964		compute_operation_effect_max(root,'$initialise_machine',OpInit,InitialStore,PathInfo,Max) :-
965		\+ b_machine_has_constants_or_properties,
966		get_max_enablings_for_init(Max,'$initialise_machine',MaxForCall),
967		empty_state(EmptyState),
968	?	succeed_max_call_id('$initialise_machine',
969		b_interpreter:b_initialise_machine(EmptyState,InitialVars,InitialStore,PathInfo),MaxForCall),
970		create_initialisation_operation(InitialVars,OpInit).
971
972
973		unused_binding(bind(C,_)) :- bmachine:b_is_unused_constant(C).
974
975		compute_constants(ConstantsStore,_Max,C) :-
976		% check if values have been computed and stored into a file before -- if yes, use them
977		load_constants(Stores,MaxReached),!,
978		C = complete_properties, % TODO: check that only complete properties stored or that we store this info
979	?	choose_loaded_solution(Stores,ConstantsStore,MaxReached).
980		compute_constants(ConstantsStore,Max,Complete) :-
981		% print('Searching for valid CONSTANTS'),nl,!,
982	?	succeed_max_call_id('$setup_constants',b_interpreter:b_set_up_concrete_constants(ConstantsStore,Complete),Max).
983
984		choose_loaded_solution(Stores,ConstantsStore,_MaxReached) :-
985	?	member(ConstantsStore,Stores).
986		choose_loaded_solution(_Stores,_ConstantsStore,true) :-
987		% provoke the setting of the "maximum reached flag"
988		succeed_max_call_id('$setup_constants',member(_,_),1),fail.
989
990		expand_const_and_vars_to_full_store(root,R) :- !,R=[].
991		expand_const_and_vars_to_full_store(concrete_constants(ConstantsStore),FullStore) :- !,
992		ConstantsStore = FullStore.
993		expand_const_and_vars_to_full_store(const_and_vars(ConstID,Vars),FullStore) :- !,
994		expand_const_and_vars(ConstID,Vars,FullStore).
995		expand_const_and_vars_to_full_store(expanded_const_and_vars(_ConstID,_Vars,ExpStore,_),FullStore) :- !,
996		FullStore = ExpStore.
997		expand_const_and_vars_to_full_store(expanded_vars(ExpStore,_),FullStore) :- !,
998		FullStore = ExpStore.
999		expand_const_and_vars_to_full_store(csp_and_b(_,BState),FullStore) :- !,
1000		expand_const_and_vars_to_full_store(BState,FullStore).
1001		expand_const_and_vars_to_full_store(R,R).
1002
1003		expand_const_and_vars(ConstID,Vars,FullStore) :-
1004		visited_expression(ConstID,concrete_constants(ConstantsStore)),
1005		%% This can take a while if the Constants are big !
1006		% print('exp: '),tools_printing:print_term_summary(ConstantsStore),nl,
1007		append(Vars,ConstantsStore,FullStore). % used to be Constants first, now consistent with b_initialise_machine2,
1008		% b_initialise_machine2 puts constants at end to make sharing of complete tail-list easier for successor states
1009
1010		expand_to_constants_and_variables(root,[],[]).
1011		expand_to_constants_and_variables(concrete_constants(ConstStore),ConstStore,[]).
1012		expand_to_constants_and_variables(const_and_vars(ConstID,VarStore),ConstStore,VarStore) :-
1013		visited_expression(ConstID,concrete_constants(ConstStore)).
1014		expand_to_constants_and_variables([],[],[]).
1015		expand_to_constants_and_variables([H|T],[],[H|T]).
1016		expand_to_constants_and_variables(csp_and_b(_,BState),ConstStore,VarStore) :-
1017		expand_to_constants_and_variables(BState,ConstStore,VarStore).
1018
1019		:- use_module(extrasrc(b_operation_cache),[compute_operation_on_expanded_store_cache/6]).
1020
1021		% compute operation effect on a store where all constants have been put into the environment
1022		compute_operation_updates_on_expanded_store(InState,OpName,Operation,NewState,PathInfo,Max) :-
1023		get_preference(try_operation_reuse,V), V \= false,
1024		b_or_z_mode, % now works with CSP || B
1025		%\+ animation_minor_mode(eventb), % projection used to confuse Event-B interpreter, see test 2138
1026		!,
1027		get_max_enablings_per_operation(Max,OpName,MaxForCall),
1028	?	compute_operation_on_expanded_store_cache(OpName,Operation,InState,NewState,PathInfo,MaxForCall).
1029		compute_operation_updates_on_expanded_store(Store,OpName,Operation,Updates,PathInfo,Max) :-
1030		extract_full_store(Store,FullStore),!,
1031	?	compute_operation_on_expanded_store2(FullStore,OpName,Operation,Updates,PathInfo,Max).
1032		compute_operation_updates_on_expanded_store(InState,OpName,Operation,Updates,PathInfo,Max) :-
1033	?	compute_operation_on_expanded_store2(InState,OpName,Operation,Updates,PathInfo,Max).
1034
1035		compute_operation_on_expanded_store2(InState,OpName,Operation,Updates,PathInfo,Max) :-
1036		get_max_enablings_per_operation(Max,OpName,MaxForCall),
1037	?	succeed_max_call_id(OpName,
1038		b_interpreter:b_execute_top_level_operation_update(OpName,Operation,InState,Updates,PathInfo),
1039		MaxForCall).
1040
1041		extract_full_store(expanded_const_and_vars(_,_,FS,_),Res) :- !, Res=FS.
1042		extract_full_store(expanded_vars(FS,_),Res) :- !, Res=FS.
1043
1044		create_initialisation_operation(_InitialVars,'$initialise_machine').
1045
1046		create_setup_constants_operation(_ConstantVars,complete_properties,R) :- !, R='$setup_constants'.
1047		create_setup_constants_operation(_ConstantVars,_,'$partial_setup_constants').
1048
1049		:- use_module(bmachine,[b_get_machine_operation_max/2]). % MAX_OPERATIONS_... DEFINITIONS
1050		get_max_enablings_per_operation_aux(OpName,RMax,RandomisedRestart) :-
1051		b_get_machine_operation_max(OpName,Max),
1052		!,
1053		(Max<0 -> RMax is -Max, RandomisedRestart=true ; RMax=Max, RandomisedRestart=false).
1054		get_max_enablings_per_operation_aux(_OpName,Max,false) :-
1055		preferences:preference(maxNrOfEnablingsPerOperation,Max).
1056
1057		max_operations_zero_for_operation(OpName) :-
1058		b_or_z_mode,
1059		b_top_level_operation(OpName),
1060		(b_get_machine_operation_max(OpName,0) -> true
1061		; get_preference(maxNrOfEnablingsPerOperation,0)).
1062
1063		get_max_enablings_per_operation(Max,OpName,MaxForCall) :-
1064		(var(Max) -> get_max_enablings_per_operation_aux(OpName,Max,RandomisedRestart) ; RandomisedRestart=false),
1065		(RandomisedRestart=true,
1066		get_preference(randomise_enumeration_order,true)
1067		-> % we succeed Max times with the value 1, thus forcing a randomised restart
1068		MaxForCall=1, between(1,Max,Retry), format('Randomised Restart ~w for ~w~n',[Retry,OpName])
1069		; % we succeed once with the value Max
1070		MaxForCall is Max).
1071
1072		get_max_enablings_for_init(Max,Op,MaxForCall) :-
1073		(var(Max) -> get_preference(maxNrOfInitialisations,Max) ; true),
1074		(Max>1,
1075		get_preference(randomisedRestartInitalisations,true),
1076		get_preference(randomise_enumeration_order,true)
1077		-> % we succeed Max times with the value 1, thus forcing a randomised restart
1078		MaxForCall=1, between(1,Max,Retry), format('Randomised Restart ~w for ~w~n',[Retry,Op])
1079		; % we succeed once with the value Max
1080		MaxForCall=Max).
1081
1082		/* PROPERTIES */
1083
1084		property(const_and_vars(ConstID,Vars),Property) :- b_or_z_mode,
1085		expand_const_and_vars(ConstID,Vars,FullStore),!,
1086	?	property(FullStore,Property).
1087		property(csp_and_b(CSPState,BState),Property) :- animation_mode(csp_and_b),!,
1088		%% print(checking_csp_and_b(CSPState)),nl,
1089		expand_const_and_vars_to_full_store(BState,FBState),
1090		(xtl_interface:cspm_property(CSPState,Property) ;
1091		b_property(FBState,Property)).
1092		property(State,Property) :- animation_mode(AM),
1093	?	(AM = b -> b_property(State,Property)
1094	?	; AM=xtl -> xtl_interface:xtl_property(State,Property)
1095		; AM=cspm -> xtl_interface:cspm_property(State,Property)
1096		; AM=csp_and_b -> b_property(State,Property) % State should be root
1097		).
1098
1099		%b_property(const_and_vars(ConstID,Vars),Prop) :- !,
1100		% expand_const_and_vars(ConstID,Vars,FullStore),
1101		% b_property(FullStore,Prop).
1102	?	b_property(root,Prop) :- !, b_preference_par(PARA,Op,VAL), Prop=.. [Op,PARA,VAL].
1103		b_property([H|T],non_ground(Var)) :- debug:debug_mode(on),
1104		member(bind(Var,Val),[H|T]),\+(ground(Val)).
1105	?	b_property([H|T],Prop) :- elementary_prop([H|T],Prop).
1106		b_property([],Prop) :- elementary_prop([],Prop).
1107		b_property(concrete_constants(DB),Prop) :- elementary_prop(DB,Prop).
1108
1109
1110
1111		:- use_module(preferences).
1112		:- use_module(b_global_sets,[b_global_set/1, b_fd_card/2,inferred_minimum_global_set_cardinality/2,
1113		inferred_maximum_global_set_cardinality/2, unfixed_deferred_set/1]).
1114
1115		% preference values shown as properties of the root node
1116		b_preference_par('MAXINT','=',MaxInt) :- get_preference(maxint,MaxInt).
1117		b_preference_par('MININT','=',MinInt) :- get_preference(minint,MinInt).
1118		b_preference_par(card(GlobalSet),Op,Card) :-
1119		b_global_set(GlobalSet),
1120		b_fd_card(GlobalSet,RCard),
1121		% provide feedback if unfixed_deferred_set
1122		(inferred_maximum_global_set_cardinality(GlobalSet,MaxCard),
1123		(inferred_minimum_global_set_cardinality(GlobalSet,MinCard) -> true ; MinCard=1),
1124		MinCard \= MaxCard,
1125		Op = ':', Card = '..'(MinCard,MaxCard)
1126
1127		;
1128
1129		inferred_minimum_global_set_cardinality(GlobalSet,MinCard),
1130		\+ (inferred_maximum_global_set_cardinality(GlobalSet,_)),
1131		Op='>=',Card=MinCard % show minimum cardinality info
1132
1133		;
1134
1135		Op= '=', (unfixed_deferred_set(GlobalSet)
1136		-> ajoin([RCard,' (assumed for deferred set)'],Card) ; Card=RCard)
1137		).
1138
1139		/* --------------------------------------------------------- */
1140
1141
1142		elementary_prop(DB,Prop) :-
1143	?	member(bind(Var,Val),DB), %print(var_prop(Var)),nl_time,
1144	?	elementary_prop3(Val,Var,Prop).
1145
1146		:- use_module(custom_explicit_sets,[is_avl_relation/1,is_avl_partial_function/1,get_first_avl_elements/4, avl_approximate_size/3]).
1147		elementary_prop3(Val,Var,Prop) :- var(Val),!, Prop = '='(Var,'_VAR_').
1148		elementary_prop3(avl_set(Avl),Var,Prop) :- !,
1149		(show_avl_set(Avl) % \+ custom_explicit_sets:is_avl_sequence(Avl))
1150	?	-> elementary_fun_prop(avl_set(Avl),Var,Prop)
1151		; elementary_var_prop(avl_set(Avl),Var,Prop)).
1152		elementary_prop3([H|T],Var,Prop) :- H=(_,_),
1153		get_preference(show_function_tuples_in_property,true),!,
1154		elementary_fun_prop([H|T],Var,Prop).
1155		elementary_prop3(Val,Var,Prop) :- elementary_var_prop(Val,Var,Prop).
1156
1157		show_avl_set(AVL) :- get_preference(show_function_tuples_in_property,true),
1158		is_avl_relation(AVL),
1159		avl_approximate_size(AVL,0,Size), Size < 257, % only the first 30 will be shown by get_relation_element anyway
1160		is_avl_partial_function(AVL).
1161
1162
1163		:- use_module(bmachine,[b_is_variable/2]).
1164		elementary_var_prop(Val,Var,Prop) :-
1165		% TODO: use translate:translate_bvalue_for_expression/3
1166		animation_minor_mode(tla),!,
1167		( identifier_has_tla_type(Var,TlaType) ->
1168		translate_bvalue_with_tlatype(Val,TlaType,Text)
1169		;
1170		translate_bvalue(Val,Text)),
1171		Prop = '='(Var,Text).
1172		elementary_var_prop(Val,Var,Prop) :-
1173	?	(var_cst_type(Var,Type)
1174		-> translate_bvalue_with_type_and_limit(Val,Type,320,Text)
1175		; translate_bvalue_with_type_and_limit(Val,any,320,Text)), % translate_properties_with_limit uses 320 Limit
1176		Prop = '='(Var,Text).
1177
1178		identifier_has_tla_type(Id,Type) :-
1179		get_texpr_id(TId,Id),
1180		(b_get_machine_constants(Ids)
1181		;b_get_machine_variables(Ids)),
1182		member(TId,Ids),!,
1183		get_texpr_info(TId,Infos),
1184		memberchk(tla_type(Type),Infos).
1185		% to do: use b_is_variable + translate_bvalue_with_type
1186		elementary_fun_prop(Val,Var,Prop) :-
1187		simple(Prop), % will only succeed if Prop is var or atom; translate_bexpression will raise error if Prop is compound
1188		nonvar(Val),
1189	?	(var_cst_type(Var,Type),dom_range_type(Type,Dom,Ran) -> true ; Type=any,Dom=any, Ran=any),
1190	?	get_relation_element(Val,X,Y), % Show value in form: Var(X) = Y
1191		create_texpr(identifier(Var),Type,[],Fun),
1192		create_value(X,Dom,Arg),
1193		create_texpr(function(Fun,Arg),Ran,[],Lhs),
1194		create_value(Y,Ran,Rhs),
1195		create_texpr(equal(Lhs,Rhs),pred,[],Expr),
1196		translate_bexpression_with_limit(Expr,80,Prop).
1197
1198		var_cst_type(Name,Type) :- (b_is_variable(Name,Type) ; b_is_constant(Name,Type)).
1199		dom_range_type(seq(R),integer,R).
1200		dom_range_type(set(couple(D,R)),D,R).
1201
1202		get_relation_element(avl_set(A),X,Y) :- custom_explicit_sets:is_avl_relation(A),
1203		!, %preferences:preference(expand_avl_upto,Limit),
1204		Limit=30, % reduced limit, as now we can inspect with evaluation view
1205		get_first_avl_elements(A,Limit,Els,CutOff),
1206		(member((X,Y),Els), X\=term(_)
1207		;
1208		CutOff=not_all, X='...', Y='...').
1209		get_relation_element(Value,X,Y) :-
1210		member((X,Y),Value). /* otherwise we have a record structure */
1211
1212		create_value('...',_,R) :- !, R = b(string('...'),string,[]).
1213		create_value(X,T,R) :-
1214		create_texpr(value(X),T,[],R).
1215
1216
1217		:- use_module(bmachine,[b_show_machine_representation/4]).
1218		:- use_module(probcspsrc(haskell_csp_analyzer),[get_internal_csp_representation/1]).
1219		get_internal_representation(X) :- get_internal_representation(X,true,false,none).
1220		get_internal_representation(X,AdditionalInfo,UnsetMinorMode,Typing) :- animation_mode(AM),
1221		get_internal_aux(AM,X,AdditionalInfo,UnsetMinorMode,Typing).
1222		get_internal_aux(b,X,AdditionalInfo,UnsetMinorMode,Typing) :- !,
1223		b_show_machine_representation(X,AdditionalInfo,UnsetMinorMode,Typing).
1224		% UnsetMinorMode=true means we try and generate classical B syntax
1225		get_internal_aux(cspm,X,_,_,_) :- !, get_internal_csp_representation(X).
1226		get_internal_aux(csp_and_b,Res,AdditionalInfo,UnsetMinorMode,Typing) :- !,
1227		append("CSP||B - B Part only",X,Res),
1228		b_show_machine_representation(X,AdditionalInfo,UnsetMinorMode,Typing).
1229		get_internal_aux(_,X,_,_,_) :- X="Internal representation only available in B or CSP mode".
1230
1231
1232		:- use_module(probcspsrc(haskell_csp),[channel/2]).
1233		:- use_module(bmachine,[b_top_level_operation/1, b_top_level_feasible_operation/1]).
1234		get_possible_event(OpName) :- b_or_z_mode,
1235		%b_is_operation_name(OpName).
1236	?	b_top_level_operation(OpName).
1237		get_possible_event(Channel) :- csp_mode,
1238	?	channel(Channel,_).
1239		% what about csp_and_b mode ?
1240
1241		get_feasible_event(OpName) :- b_or_z_mode,
1242		%b_is_operation_name(OpName).
1243	?	b_top_level_feasible_operation(OpName).
1244		get_feasible_event(Channel) :- csp_mode,
1245	?	channel(Channel,_).
1246
1247
1248		get_possible_language_specific_top_level_event(OpName,ResultNames,ParameterNames) :-
1249		b_or_z_mode,!,
1250		get_possible_b_top_level_event(OpName,ResultNames,ParameterNames).
1251		get_possible_language_specific_top_level_event(TransName,[],ParameterNames) :- xtl_mode, !,
1252		xtl_transition_parameters(TransName,ParameterNames).
1253		get_possible_language_specific_top_level_event(Channel,unknown,unknown) :- csp_mode,
1254		channel(Channel,_).
1255
1256		get_possible_b_top_level_event('$setup_constants',[],Ids) :-
1257		b_machine_has_constants_or_properties,
1258		b_get_machine_constants(TIds), maplist(get_texpr_id,TIds,Ids).
1259		get_possible_b_top_level_event('$initialise_machine',[],Ids) :-
1260		b_get_machine_variables(TIds), maplist(get_texpr_id,TIds,Ids).
1261		get_possible_b_top_level_event(OpName,ResultNames,ParameterNames) :-
1262		b_top_level_operation(OpName),
1263		%b_get_machine_operation(OpName,Results,RealParameters,_RealBody,_OType,_OpPos),
1264		b_get_machine_operation_for_animation(OpName,Results,AllParameters,_RealBody,_OType,_TL),
1265		maplist(get_texpr_id,Results,ResultNames),
1266		maplist(get_texpr_id,AllParameters,ParameterNames).
1267
1268		% obtain a textual description of specification category names
1269		get_specification_description(Category,Name) :-
1270		animation_mode(Mode),
1271		(animation_minor_mode(Minor) -> true ; Minor = none), % there could be several minor modes !
1272	?	(get_specific_description(Mode,Minor,Category,N) -> Name=N
1273		; get_default_description(Category,N) -> Name = N
1274		; add_error(get_specification_description,'Unknown category: ',Category),
1275		Name=Category).
1276
1277		get_specific_description(cspm,_,C,N) :- get_csp_description(C,N).
1278		get_specific_description(b,eventb,C,N) :- get_eventb_description(C,N).
1279		get_specific_description(b,tla,C,N) :- get_tla_description(C,N).
1280		get_specific_description(b,alloy,C,N) :- get_alloy_description(C,N).
1281
1282		get_csp_description(operations,'CHANNELS').
1283		get_csp_description(operation,'CHANNEL').
1284		get_csp_description(assertions,'CSP_ASSERTIONS').
1285		get_csp_description(machine,'CSP_SPECIFICATION').
1286		get_csp_description(operations_lc,'events').
1287
1288		get_tla_description(properties,'ASSUME').
1289		get_tla_description(machine,'MODULE').
1290		get_tla_description(operation,'ACTION'). % no key word
1291		get_tla_description(operations,'ACTIONS'). % no key word
1292		get_tla_description(operations_lc,'actions').
1293
1294		get_eventb_description(properties,'AXIOMS').
1295		get_eventb_description(assertions,'THEOREMS').
1296		get_eventb_description(operations,'EVENTS').
1297		get_eventb_description(operation,'EVENT').
1298		get_eventb_description(operations_lc,'events').
1299		get_eventb_description(machine,'MODEL').
1300
1301		get_alloy_description(machine,'MODULE').
1302		get_alloy_description(sets,'SIGNATURES'). % abstract
1303		get_alloy_description(operations,'RUNS').
1304		get_alloy_description(operation,'RUN').
1305
1306		get_default_description(constraints,'CONSTRAINTS').
1307		get_default_description(properties,'PROPERTIES').
1308		get_default_description(assertions,'ASSERTIONS').
1309		get_default_description(invariant,'INVARIANT').
1310		get_default_description(invariants,'INVARIANTS').
1311		get_default_description(operations,'OPERATIONS').
1312		get_default_description(operation,'OPERATION').
1313		get_default_description(operations_lc,'operations').
1314		get_default_description(machine,'MACHINE').
1315		get_default_description(constants,'CONSTANTS').
1316		get_default_description(variables,'VARIABLES').
1317		get_default_description(initialisation,'INITIALISATION').
1318		get_default_description(sets,'SETS').
1319		get_default_description(goal,'GOAL').
1320		get_default_description(definition,'DEFINITION').
1321		get_default_description(definitions,'DEFINITIONS').
1322		get_default_description(variants,'VARIANTS').