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
6		:- module(error_manager,[init_error_manager/0,
7		add_warning/2, add_warning/3, add_warning/4,
8		reset_errors/0, clear_wd_errors/0,
9		add_error/2, add_error/3, add_error/4,
10		add_error_and_fail/3, add_error_and_fail/2,
11		add_error_fail/3,
12		add_failed_call_error/1, add_internal_error/2, add_internal_error/4,
13		register_optional_error_or_warning/1, reset_optional_errors_or_warnings/0,
14		assert_true/1,
15		add_debug_message/3, add_debug_message/4,
16		add_msg_warn_or_err/5,
17		add_message/2, add_message/3, add_message/4,
18		add_all_perrors/1, add_all_perrors/2, add_all_perrors/3, add_all_perrors/4,
19		get_perror/4,
20		no_real_perror_occurred/1,
21		get_all_errors/1, tcltk_get_all_errors/4,
22		get_tk_table_position_info/2,
23		get_all_errors_and_reset/1, % call if you want to start with a fresh top-level error scope
24		get_all_errors_with_span_info_and_reset/1, % ditto + obtain location info; excludes messages
25		get_all_errors_with_span_and_context_and_reset/1, % ditt + global context and call stack
26		get_all_errors_and_clear/1,
27		get_error/2, get_error_with_span/3,
28		get_warning/2, check_error_occured/2, check_warning_occured/2,
29		get_error_span_linecol/5, get_error_span_linecol/4,
30		simplify_span/2,
31		tk_get_error_span_linecol_for_main_file/4,
32		register_error_span/2,
33		check_error_span_file_linecol/6,
34		position_is_not_in_main_file/1,
35		error_or_warning_occured/0,
36		real_error_occurred/0, reset_real_error_occurred/0, assert_real_error_occurred/1,
37		warning_occurred/0, % true if a warning was raised
38		wd_error_occured/0,
39		test_error_occurred/1, count_errors_occurred/2,
40		get_total_number_of_errors/1,
41		reset_error_spans/0,
42
43		backup_errors/0, backed_up_error/4,
44
45		set_error_context/1, clear_error_context/0,
46		get_error_context/1, restore_error_context/1,
47		print_error_context/0,
48
49		extract_span_description/2, extract_symbolic_label_pos/2, extract_symbolic_label/2,
50		extract_line_col/5, extract_file_line_col/6,
51		extract_all_line_col/5,
52		extract_line_col_for_main_file/5,
53		extract_subsidiary_tail_file_name/2, extract_tail_file_name/2,
54		extract_file_number_and_name/3,
55		extract_additional_description/2, extract_pos_context/4,
56		extract_definition_call_stack/2,
57		print_error_span/1, print_message_span/1,
58
59		turn_show_error_source_on/0, turn_show_error_source_off/0,
60
61		enter_new_error_scope/1, enter_new_error_scope/2,
62		enter_new_clean_error_scope/1,
63		get_current_error_scope/1,
64		exit_error_scope/2, exit_error_scope/3,
65		error_occurred_at_level/1, specific_event_occurred_at_level/2,
66		%throw_errors_in_scope/3,
67		add_new_event_in_error_scope/1, add_new_event_in_error_scope/2,
68		event_occurred_in_error_scope/1, error_occurred_in_error_scope/0,
69		clear_events_in_error_scope/2, clear_events_in_current_error_scope/1,
70		translate_error_event/2,
71		clear_enumeration_warning_in_error_scope/1,
72		clear_all_errors_in_error_scope/1,
73		call_in_fresh_error_scope_for_one_solution/1,
74		enumeration_warning_occured_in_error_scope/0,
75		is_enumeration_warning_exception/1,
76		abort_error_occured_in_error_scope/0,
77		on_enumeration_warning/2, on_enumeration_warning_with_continue/3,
78		throw_enumeration_warnings_in_current_scope/0,
79		throw_enumeration_warnings_in_scope/3,
80		catch_enumeration_warning_exceptions/2, catch_enumeration_warning_exceptions/3,
81		catch_enumeration_warning_exceptions/4, catch_enumeration_warning_exceptions_and_wd_failures/5,
82		call_with_enumeration_warning/1,
83		observe_enumeration_warnings/2,
84		critical_enumeration_warning_occured_in_error_scope/4,
85		critical_enumeration_warning_occured_in_error_scope/0,
86		virtual_time_out_occured_in_error_scope/1, % variation which returns a virtual_time_out(.) term
87		clear_enumeration_warnings/0,
88		translate_events_in_current_scope_to_warnings/2,
89		time_out_with_enum_warning_one_solution/3, % use this for finding one solution
90		time_out_with_enum_warning_one_solution/4,
91		time_out_with_enum_warning_one_solution_no_new_error_scope/3,
92		is_time_out_result/1,
93		time_out_with_enum_warning_for_findall/3, % use this if you cycle through all solutions
94		time_out_with_enum_warning_for_findall_in_current_error_scope/4,
95		get_virtual_time_out_from_exception/2, % used by time_out_with_enum_warning_for_findall
96		clpfd_overflow_msg/1,
97		is_clpfd_overflow_representation_error/2, is_clpfd_overflow_representation_error_msg/1,
98		logged_error/4,
99		display_error_statistics/0,
100		set_error_manager_silent_mode/1
101		]).
102
103		% meta_predicate annotations should appear before loading any code:
104		:- meta_predicate add_failed_call_error(0).
105		:- meta_predicate add_internal_error(-,:).
106		:- meta_predicate add_new_event_in_error_scope(-,2).
107
108		:- meta_predicate on_enumeration_warning(0,0).
109		:- meta_predicate on_enumeration_warning_with_continue(0,0,0).
110
111		:- meta_predicate catch_enumeration_warning_exceptions(0,0).
112		:- meta_predicate catch_enumeration_warning_exceptions(0,0,-).
113		:- meta_predicate catch_enumeration_warning_exceptions(0,0,-,-).
114		:- meta_predicate catch_enumeration_warning_exceptions_and_wd_failures(0,0,-,0,-).
115
116		:- meta_predicate observe_enumeration_warnings(0,0).
117
118		:- meta_predicate time_out_with_enum_warning_one_solution(0,-,-).
119		:- meta_predicate time_out_with_enum_warning_one_solution(0,-,-,-).
120
121		:- meta_predicate call_in_fresh_error_scope_for_one_solution(0).
122
123		:- meta_predicate call_with_enumeration_warning(0).
124
125		:- meta_predicate time_out_with_enum_warning_one_solution_no_new_error_scope(0,-,-).
126
127		:- meta_predicate time_out_with_enum_warning_for_findall(0,-,-).
128		:- meta_predicate time_out_with_enum_warning_for_findall2(-,0,-,-).
129
130		:- meta_predicate time_out_with_enum_warning_for_findall_in_current_error_scope(-,0,-,-).
131
132		:- meta_predicate assert_true(0).
133		:- meta_predicate catch_wd(-,0,-).
134
135		% ------------
136
137		:- use_module(library(lists)).
138
139		:- use_module(tools,[get_tail_filename/2]).
140		:- use_module(tools_lists,[count_occurences/2]).
141		:- use_module(tools_printing,[print_error/1,print_message_on_stream/3,format_error_with_nl/2,format_with_colour/4]).
142		:- use_module(tools_strings,[ajoin/2, string_concatenate/3]).
143
144		:- use_module(module_information,[module_info/2]).
145		:- module_info(group,infrastructure).
146		:- module_info(description,'The error_manager controls error messages. Error messages can be added, retrieved, counted,etc. The module also takes care of extracting source spans from error messages.').
147
148		%:- use_module(translate).
149		:- use_module(debug, [debug_mode/1, debug_println/1, debug_println/2, debug_format/3]).
150		:- use_module(preferences,[get_preference/2,reset_temporary_preference/2,
151		temporary_set_preference/3]).
152
153
154		:- use_module(extension('counter/counter'),
155		[counter_init/0, new_counter/1, get_counter/2, inc_counter/2, set_counter/2]).
156
157		% cur_block_level is now stored as a C counter, which needs to be initialised
158		init_error_manager :- counter_init, new_counter(cur_block_level).
159
160
161		:- dynamic optional_error_or_warning/1.
162		register_optional_error_or_warning(Type) :-
163		(optional_error_or_warning(Type) -> true ; assertz(optional_error_or_warning(Type))).
164		reset_optional_errors_or_warnings :- retractall(optional_error_or_warning(_)).
165
166		% INTERNAL ERRORS
167
168
169		add_failed_call_error(Call) :- !,
170		add_internal_error('Internal Error; call failed: ',Call).
171
172		add_internal_error(Module,Msg,Term,Span) :-
173		add_error(internal_error(Module),Msg,Term,Span).
174		add_internal_error(Msg,Module:Call) :- !,
175		add_error(internal_error(Module),Msg,Call).
176		add_internal_error(Msg,Call) :-
177		add_error(internal_error(unknown_module),Msg,Call).
178
179
180		% ERROR SCOPING
181
182		%:- dynamic cur_block_level/1.
183		%cur_block_level(0). % no realised as a C counter
184		:- volatile error_occurred_at_level/1.
185		:- dynamic error_occurred_at_level/1.
186		:- volatile throw_error/3.
187		:- dynamic throw_error/3.
188		:- volatile do_not_print_error/2.
189		:- dynamic do_not_print_error/2.
190
191
192		get_current_error_scope(Level) :- get_counter(cur_block_level,Level).
193
194		enter_new_error_scope(Level,_PP) :-
195		enter_new_error_scope(Level). %, tools_printing:print_term_summary(enter(Level,PP)),nl.
196		enter_new_error_scope(Level) :-
197		enter_new_clean_error_scope(Level),
198		L1 is Level - 1,
199		copy_throw_errors(L1,Level).
200		copy_throw_errors(L1,L) :-
201	?	throw_error(L1,Error,Span), %print(copy(throw(L1,L,Error))),nl,
202		assertz(throw_error(L,Error,Span)),fail.
203		copy_throw_errors(L1,L) :-
204	?	do_not_print_error(L1,Error),
205		assertz(do_not_print_error(L,Error)),fail.
206		copy_throw_errors(_,_).
207		enter_new_clean_error_scope(Level) :-
208		inc_counter(cur_block_level,L1),
209	?	(retract(throw_error(L1,_,_)) -> retractall(throw_error(L1,_,_)) ; true), % DO WE NEED THIS ??
210		(retract(do_not_print_error(L1,_)) -> retractall(do_not_print_error(L1,_)) ; true),
211		% print(enter(L1)),nl,trace,
212		Level=L1.
213
214
215		% mark that everything unifying with Error should be thrown rather than collected
216		throw_errors_in_scope(Level,Error,Span) :-
217		(\+ throw_error(Level,Error,Span) % TO DO: check that we are an instance of existing error !
218		-> assertz(throw_error(Level,Error,Span))
219		; true).
220
221		% state that this event/error should not be printd
222		silent_enum_warnings_in_scope(Level,Critical) :-
223		Error = enumeration_warning(_,_,_,_,Critical),
224		assertz(do_not_print_error(Level,Error)).
225
226		clear_all_errors_in_error_scope(Level) :- %print(clearing(Level)),nl,
227		clear_events_in_error_scope(Level,_),
228		error_occurred_at_level(L1), L1>Level, %print(clearing(L1)),nl,
229		clear_events_in_error_scope(Level,_),fail.
230		clear_all_errors_in_error_scope(_).
231
232		% useful in call_cleanup; when error block may already be exited
233		exit_error_scope_if_necessary(Level,PP) :- get_counter(cur_block_level,CurLevel),
234		(Level =< CurLevel
235		-> exit_error_scope(Level,_,PP) %,print(exit(Level,CurLevel,PP)),nl
236		; true).
237
238		exit_error_scope(Level,ErrorOcc) :- exit_error_scope(Level,ErrorOcc,unknown).
239		exit_error_scope(Level,ErrorOcc,PP) :- get_counter(cur_block_level,CurL),
240		(CurL = Level -> NewL is CurL-1
241		; Level < CurL -> NewL is Level-1,
242		%print_error_scopes,
243		format('*** exiting multiple error blocks (~w -> ~w) for ~w ***~n',[CurL,NewL,PP])
244		; format('*** block ~w already exited (currently at ~w) for ~w ***~n',[Level,CurL,PP]),
245		NewL is CurL
246		), set_counter(cur_block_level,NewL),
247		copy_error_scope_events(CurL,NewL),
248	?	(retract(throw_error(CurL,_,_)) -> retractall(throw_error(CurL,_,_)) ; true),
249	?	(retract(do_not_print_error(CurL,_)) -> retractall(do_not_print_error(CurL,_)) ; true),
250		(retract(error_occurred_at_level(CurL))
251		-> ErrorOcc=true,
252		(error_occurred_at_level(NewL) -> true ; assertz(error_occurred_at_level(NewL)))
253		; ErrorOcc=false).
254		%indent(Level), format('exit level ~w for ~w, cur level ~w, error occ = ~w~n',[Level,PP,CurL,ErrorOcc]).
255
256
257		% versions of enter_new_error_scope and exit_error_scope which re_enter blocks and clean up upon backtracking
258		%enter_new_error_scope_bt(Level,PP) :- enter_new_error_scope(Level,PP), exit_upon_fail(Level,PP).
259		%exit_upon_fail(_,_).
260		%exit_upon_fail(Level,PP) :- print(exit_upon_backtrack(Level,PP)),nl,
261		% exit_error_scope(Level,_,PP),fail.
262		%
263		%exit_error_scope_bt(Level,ErrorOcc,PP) :- exit_error_scope(Level,ErrorOcc,PP).
264		%exit_error_scope_bt(Level,_ErrorOcc,PP) :- print(re_enter_block(Level,PP)),nl,
265		% enter_new_error_scope(Level2,PP),
266		% (Level2=Level -> true ; print(mismatch_when_reentering_block(Level,PP)),nl),
267		% fail.
268
269		% ---------------------------
270
271
272
273		assert_real_error_in_current_block(Source) :- get_counter(cur_block_level,L),L>0,
274		%print(assert_real_error_in_current_block(L)),nl,
275		(specific_event_occurred_at_level(L,Source) -> true
276		; assertz(specific_event_occurred_at_level(L,Source))), % ensures that clear_events_in_current_error_scope does not remove error_occurred_at_level if used for enumeration warnings, ...
277		\+ error_occurred_at_level(L), assertz(error_occurred_at_level(L)),!.
278		assert_real_error_in_current_block(_).
279
280
281		reset_error_scopes :-
282		(set_counter(cur_block_level,0) -> true
283		; format(user_error,'~n*** set_counter(cur_block_level,0) failed!!~n',[]),fail
284		), % try debug random gitlab failures; something really bad happened
285		retractall(error_occurred_at_level(_)),
286		retractall(specific_event_occurred_at_level(_,_)).
287
288		% for debugging / portraying error scopes:
289		% portray_error_scopes
290		:- public print_error_scopes/0.
291		print_error_scopes :-
292		if(get_counter(cur_block_level,L),
293		format(' Cur Block Level = ~w~n',[L]),
294		format(' *** NO Cur Block Level Information !!',[])
295		),
296		fail.
297		print_error_scopes :-
298		findall(L,error_occurred_at_level(L),LL),
299		format(' Errors occured at those levels: ~w~n',[LL]),
300		format(' Specific events at levels:~n',[]),
301		specific_event_occurred_at_level(Level,Err),
302		format(' ~w --> ~w~n',[Level,Err]),
303		fail.
304		print_error_scopes.
305
306		% call a predicate in fresh error scope (assuming one solution is searched for only; failure is also ok)
307		% and then discard all errors
308		call_in_fresh_error_scope_for_one_solution(Call) :-
309		enter_new_error_scope(Level,call_in_fresh_error_scope_for_one_solution),
310		call_cleanup(Call,
311		(clear_all_errors_in_error_scope(_),
312		exit_error_scope(Level,_,call_in_fresh_error_scope_for_one_solution))).
313
314		:- volatile specific_event_occurred_at_level/2.
315		:- dynamic specific_event_occurred_at_level/2.
316
317		% can be used to keep track of whether specific events occurred within an error_scope
318		add_new_event_in_error_scope(Event) :-
319		add_new_event_in_error_scope(Event,do_nothing).
320		do_nothing(_,_).
321		add_new_event_in_error_scope(Event,PrintMessageCall) :-
322		get_counter(cur_block_level,L),
323	?	(specific_event_occurred_at_level(L,Event) -> fail
324	?	; (throw_error(L,Event,Span)
325		-> (debug_mode(off) -> true ; print_message(informational,throwing(Event))), % trace, % <---
326		(do_not_print_error(L,Event), debug_mode(off) -> true ; call(PrintMessageCall,throwing,Span)),
327		% Note: event is not asserted ! See e.g. tests 1089, 1519, 1522, 1661, 1199, 1291, ...
328		throw(Event)
329		; assertz(specific_event_occurred_at_level(L,Event)),
330		(do_not_print_error(L,Event), debug_mode(off) -> true ; call(PrintMessageCall,not_throwing,unknown))
331		)
332		).
333
334		% call if you just want to add the error information; without throwing
335		assert_event_in_error_scope_without_throw(Event) :- get_counter(cur_block_level,L),
336		(specific_event_occurred_at_level(L,Event) -> true
337		; assertz(specific_event_occurred_at_level(L,Event))).
338
339		error_occurred_in_error_scope :- get_counter(cur_block_level,L),error_occurred_at_level(L).
340	?	event_occurred_in_error_scope(Event) :- get_counter(cur_block_level,L),specific_event_occurred_at_level(L,Event).
341
342	?	copy_error_scope_events(FromLevel,ToLevel) :- retract(specific_event_occurred_at_level(FromLevel,Event)),
343	?	\+ specific_event_occurred_at_level(ToLevel,Event),
344		% print(copying_event(FromLevel,ToLevel,Event)),nl,
345		assertz(specific_event_occurred_at_level(ToLevel,Event)), % should we throw if this level demands it ?
346		(throw_error(ToLevel,Event,_Span)
347		-> debug_println(20,throw_copied_event(Event)), throw(Event)),
348		fail.
349		copy_error_scope_events(_,_).
350
351		clear_events_in_current_error_scope(Event) :- get_counter(cur_block_level,L),clear_events_in_error_scope(L,Event).
352
353		%clear_events_in_error_scope(L,Event) :-retract(specific_event_occurred_at_level(L,Event)), print(retract(L,Event)),nl,fail.
354
355		clear_enumeration_warning_in_error_scope(Level) :-
356		clear_events_in_error_scope(Level,enumeration_warning(_,_,_,_,_)).
357
358		clear_events_in_error_scope(L,Event) :-
359	?	(specific_event_occurred_at_level(L,_)
360		-> retractall(specific_event_occurred_at_level(L,Event)),
361	?	(specific_event_occurred_at_level(L,_) -> true % we have not removed all events
362		; retract(error_occurred_at_level(L)) -> true
363		; true
364		)
365		; true). % no errors can have been there
366
367		throw_enumeration_warnings_in_current_scope :-
368		get_counter(cur_block_level,L), throw_enumeration_warnings_in_scope(L,_,unknown).
369
370		throw_enumeration_warnings_in_scope(Level,Critical,Span) :-
371		simplify_span(Span,SimplifiedSpan), % relevant for test 1562
372		throw_errors_in_scope(Level,enumeration_warning(_,_,_,_,Critical),SimplifiedSpan).
373
374		on_enumeration_warning(Call, BackupCall) :-
375	?	on_enumeration_warning_with_continue(Call, BackupCall, true).
376		% sets up a new error scope and forces enumeration_warnings to be thrown
377		% if an enumeration_warning happens the BackupCall is executed
378		on_enumeration_warning_with_continue(Call, _, _) :- is_true_call(Call),!. % happens e.g., for card_for_specific_closure3
379		on_enumeration_warning_with_continue(Call, BackupCall, TrueContinuation) :-
380		enter_new_error_scope(Level,on_enumeration_warning_with_continue),
381		throw_enumeration_warnings_in_scope(Level,_,unknown),
382	?	call_cleanup(
383		catch(
384		if(Call,
385		(exit_error_scope(Level,_,on_enumeration_warning_with_continue_true),
386		% TODO: we need a version that re-instates error_scope upon backtracking?!
387		call(TrueContinuation)),
388		(exit_error_scope(Level,_,on_enumeration_warning_with_continue_false),fail)
389		),
390		Exc,
391		(exit_error_scope(Level,_,on_enumeration_warning_with_continue_exception), % We do not catch timeouts
392		(Exc=enumeration_warning(_,_,_,_,_) -> call(BackupCall) ; throw(Exc))
393		)
394		),
395		exit_error_scope_if_necessary(Level,on_enumeration_warning_with_continue_timeout) % TIMEOUT
396		).
397
398		% check if we are simply calling on_enumeration_warning with trivial true call; avoid call_cleanup, error_scope.
399		is_true_call(_:X) :- !, nonvar(X), is_true_call(X).
400		is_true_call(call(X)) :- !, is_true_call(X).
401		is_true_call(true).
402
403		catch_enumeration_warning_exceptions(Call, BackupCall) :-
404	?	catch_enumeration_warning_exceptions_and_wd_failures(Call,BackupCall,false,fail,unknown).
405		catch_enumeration_warning_exceptions(Call, BackupCall, AddAsEventError) :-
406		catch_enumeration_warning_exceptions_and_wd_failures(Call,BackupCall,AddAsEventError,fail,unknown).
407		catch_enumeration_warning_exceptions(Call, BackupCall, AddAsEventError,Source) :-
408	?	catch_enumeration_warning_exceptions_and_wd_failures(Call,BackupCall,AddAsEventError,fail,Source).
409
410		% can be used to check if an exception is an enumeration warning
411		is_enumeration_warning_exception(enumeration_warning(_Enumerating,_Type,_Range,_RestrRange,_Critical)).
412
413		% removed usage of call_cleanup; can cause huge runtime in debug_mode, cf SPRM-21383 but also e.g. for ProPlanGross.mch
414		% but simple_call_cleanup requires that C does not backtrack and CleanupCall called in case of exception
415		% does not catch timeouts, relevant for test 2355
416		% but using call_cleanup in SICStus 4.9 for PlanProGross.mch results in timeout after several minutes in setup constants
417		:- meta_predicate simple_call_cleanup(0,0).
418	?	simple_call_cleanup(C,CleanupCall) :- if(C,CleanupCall, (CleanupCall,fail)).
419
420		% AddAsEventError = true means that caught exceptions are added as event_errors in scope
421		% (this can be important if we later want to decide whether an enumeration warning occured)
422		% WDCall: this gets called when a well_definedness_error is raised by the Call
423		% assumes Call does not backtrack to use simple_call_cleanup
424		catch_enumeration_warning_exceptions_and_wd_failures(Call, BackupCall,AddAsEventError,WDCall,Source) :-
425		enter_new_error_scope(Level,catch_enumeration_warning_exceptions),
426		% print(enter(Level)),nl,
427		% difference: we do not force to throw_errors_in_scope
428		(Source = ignore(_) -> silent_enum_warnings_in_scope(Level,critical) ; true),
429	?	catch(
430		simple_call_cleanup(if(Call,true,catch_wd(Level,WDCall,Source)),
431		(%print(exit(Level)),nl,
432		exit_error_scope(Level,_,catch_enumeration_warning_exceptions))),
433		% call_cleanup can be tricky in case of success of Call: the error scope may not be exited immediately; TO DO: maybe rewrite using same style as above (using if + catch)
434		enumeration_warning(A,B,C,D,E),
435		(exit_error_scope(Level,_,catch_enumeration_warning_exceptions), % added due to simple_call_cleanup
436		(AddAsEventError=false
437		-> (Source=ignore(Src)
438		-> debug_format(19,'%%% Ignoring unbounded enumeration warning (source:~w).~n',[Src])
439		; true)
440		% inform that enum warning was not serious: there is a fall-back solution
441		; assert_event_in_error_scope_without_throw(enumeration_warning(A,B,C,D,E))),
442		BackupCall)).
443
444		catch_wd(Level,WDCall,Source) :-
445		WDCall \= fail,
446		% print(check_wd(Level,Source)),nl, portray_events_in_error_scope,nl,
447		specific_event_occurred_at_level(Level,well_definedness_error),!,
448		formatsilentmsg(user_output,'%%% well_definedness_error (source:~w).~n',[Source]),
449		call(WDCall).
450		catch_wd(_,_,_) :- fail.
451
452
453		% execute some code when enumeration warning occurs; and then throw exception again
454		observe_enumeration_warnings(Call,ObserverCallToExecute) :-
455		catch(Call, enumeration_warning(A,B,C,D,E),
456		call_cleanup(ObserverCallToExecute, throw(enumeration_warning(A,B,C,D,E)))).
457
458
459		% sets up a new error scope and forces enumeration_warnings to be thrown
460		% the exceptions are not caught !
461		call_with_enumeration_warning(Call) :-
462		enter_new_error_scope(Level,call_with_enumeration_warning),
463		throw_enumeration_warnings_in_scope(Level,_,unknown),
464		call_cleanup(
465		(Call, % the assumption is that Call will only have one solution
466		exit_error_scope(Level,_,call_with_enumeration_warning_true)),
467		exit_error_scope_if_necessary(Level,call_with_enumeration_warning_timeout) % failure, TIMEOUT or Exception
468		).
469
470
471		% a version of time_out which treats enumeration_warnings like time-outs
472		% and also checks enumeration_warnings in case of failure
473		% assumes we only look for one solution (otherwise error scope cleanup has to be changed !! )
474		time_out_with_enum_warning_one_solution(Call,TO,TimeOutRes,ClearEnumWarnings) :-
475		enter_new_error_scope(Level,time_out_with_enum_warning_one_solution),
476		call_cleanup(
477		catch(
478		time_out_check_enum_warning_for_failure(Call,TO,TimeOutRes,ClearEnumWarnings,perform_cut),
479		enumeration_warning(A,B,C,D,E),
480		% no need to clear: we leave error_scope below
481		TimeOutRes=virtual_time_out(thrown_enumeration_warning(A,B,C,D,E))),
482		exit_error_scope(Level,_,time_out_with_enum_warning_one_solution)).
483
484		% here enumeration warnings are not cleared and propagated to outer error scope
485		time_out_with_enum_warning_one_solution(Call,TO,TimeOutRes) :-
486		time_out_with_enum_warning_one_solution(Call,TO,TimeOutRes,no_clear).
487
488
489		enumeration_warning_occured_in_error_scope :-
490	?	event_occurred_in_error_scope(enumeration_warning(_,_,_,_,_)).
491
492		abort_error_occured_in_error_scope :-
493		event_occurred_in_error_scope(abort_error(_)). % is this still being generated??
494		abort_error_occured_in_error_scope :-
495		event_occurred_in_error_scope(well_definedness_error).
496
497
498		% just like above; but does not set up new error_scope (for performance) and clears enumeration warnings in case of failure and success
499		time_out_with_enum_warning_one_solution_no_new_error_scope(Call,TO,TimeOutRes) :-
500		(enumeration_warning_occured_in_error_scope
501		-> %trace,
502		format('Events in error block:~n',[]),portray_events_in_error_scope,
503		add_internal_error('Error block already has enumeration warnings',time_out_with_enum_warning_one_solution_no_new_error_scope(Call,TO,TimeOutRes))
504		; true),
505		% Note: will call safe_time_out which will not call time_out when time_out_preference_disabled / disable_time_out
506		catch(
507		time_out_check_enum_warning_for_failure(Call,TO,TimeOutRes,clear_errors,perform_cut), % clear errors so we can continue using same error scope
508		enumeration_warning(A,B,C,D,E),
509		%% (print(enum_warning),nl,TimeOutRes=time_out)). %%
510		TimeOutRes=virtual_time_out(thrown_enumeration_warning(A,B,C,D,E))).
511
512
513		% check if a result is a time_out:
514		is_time_out_result(time_out).
515		is_time_out_result(virtual_time_out(_)).
516
517		% a version which is to be used not for a single call but for backtracking
518		% generate virtual time_out at the end if enumeration warning occured
519
520		time_out_with_enum_warning_for_findall(Call,TO,TimeOutRes) :-
521		enter_new_error_scope(Level,time_out_with_enum_warning_for_findall),
522	?	time_out_with_enum_warning_for_findall2(Level,Call,TO,TimeOutRes).
523
524		time_out_with_enum_warning_for_findall2(_Level,Call,TO,TimeOutRes) :- %print(enter(_Level)),nl,
525	?	catch(
526		time_out_check_enum_warning_for_failure(Call,TO,TimeOutRes,no_clear,no_cut),
527		Exc,
528		get_virtual_time_out_from_exception(Exc,TimeOutRes)). % virtual time_out
529		time_out_with_enum_warning_for_findall2(Level,_Call,_TO,_TimeOutRes) :- % print(exit(Level)),nl,
530		clear_events_in_error_scope(Level,enumeration_warning(_,_,_,_,_)),
531		exit_error_scope(Level,_,time_out_with_enum_warning_for_findall2),fail.
532
533		% a version of time_out_with_enum_warning_for_findall where you manually have to enter_new_error_scope before
534		% and exit_error_scope afterwards; useful if you repeatedly call this predicate and want to set up the block only once
535		time_out_with_enum_warning_for_findall_in_current_error_scope(_Level,Call,TO,TimeOutRes) :- %print(enter(_Level)),nl,
536	?	catch(
537		time_out_check_enum_warning_for_failure(Call,TO,TimeOutRes,no_clear,no_cut),
538		Exc,
539		get_virtual_time_out_from_exception(Exc,TimeOutRes)). % virtual time_out
540		time_out_with_enum_warning_for_findall_in_current_error_scope(Level,_Call,_TO,_TimeOutRes) :-
541		% does not exit level
542		clear_events_in_error_scope(Level,enumeration_warning(_,_,_,_,_)),fail.
543
544		% ------------
545
546		% see if an exception corresponds to a virtual_timeout in the form of an enumeration warning
547		% also treats a CLPFD overflow as a virtual time-out in the sense that computation was aborted
548		get_virtual_time_out_from_exception(enumeration_warning(Cause,_,_,_,_),TimeOutRes) :- !,
549		get_virtual_time_out_res(Cause,TimeOutRes).
550		get_virtual_time_out_from_exception(error(_ErrMsg,ErrTerm),TimeOutRes) :-
551		is_clpfd_overflow_representation_error(ErrTerm,Cause),!,
552		clpfd_overflow_msg(Msg),
553		add_warning(clpfd_overflow,Msg),
554		TimeOutRes = virtual_time_out(Cause).
555		get_virtual_time_out_from_exception(Exc,_) :- % not detected as virtual time-out: throw again
556		throw(Exc).
557
558		get_virtual_time_out_res(kodkod_timeout,Res) :- !, Res= virtual_time_out(kodkod_timeout).
559		get_virtual_time_out_res(_,virtual_time_out(exception)).
560
561
562		is_clpfd_overflow_representation_error(representation_error(_Constraint,_,CauseMsg),CauseMsg) :-
563		is_clpfd_overflow_representation_error_msg(CauseMsg).
564		is_clpfd_overflow_representation_error(domain_error(list_to_fdset(_FDLIST,_),_,_,_List),CauseMsg) :-
565		CauseMsg = 'CLPFD integer overflow'.
566		is_clpfd_overflow_representation_error_msg('CLPFD integer overflow').
567		is_clpfd_overflow_representation_error_msg('max_clpfd_integer').
568		is_clpfd_overflow_representation_error_msg('min_clpfd_integer').
569
570		clpfd_overflow_msg(M) :- clpfd_interface:is_64_bit_system, !,
571		(get_preference(use_clpfd_solver,true)
572		-> M = 'A CLPFD integer overflow occurred.\nSet CLPFD preference to FALSE (Animation Preferences).'
573		; M = 'A CLPFD integer overflow occurred (despite CLPFD preference being FALSE).' % should normally not happen
574		).
575		clpfd_overflow_msg('A CLPFD integer overflow occurred.\nSet CLPFD preference to FALSE (Animation Preferences) or use a 64 bit version of ProB.').
576
577		% -----------------
578
579		:- use_module(tools_meta,[safe_time_out/3]).
580		% a version of time_out which upon failure checks if enumeration warnings were generated
581		time_out_check_enum_warning_for_failure(Call,TO,TimeOutRes,ClearErrors,CutAfterFirstSol) :-
582	?	safe_time_out(Call,TO,TimeOutRes), % a safe version which checks that time-out value TO is not too large
583		%call(Call), TimeOutRes=ok,
584		(TimeOutRes = time_out -> ! %, print(real_timeout),nl
585		; (ClearErrors=clear_errors -> clear_enumeration_warnings ; true),
586		(CutAfterFirstSol=perform_cut -> ! ; true)
587		%,print(sol),nl
588		).
589		time_out_check_enum_warning_for_failure(_Call,_TO,TimeOutRes,ClearErrors,_) :- % print(failure),nl,
590	?	virtual_time_out_occured_in_error_scope(TimeOutRes),
591		(ClearErrors=clear_errors -> clear_enumeration_warnings ; true).
592
593		virtual_time_out_occured_in_error_scope(TimeOutRes) :-
594	?	event_occurred_in_error_scope(enumeration_warning(A,B,C,D,critical)), % print(virtual),nl,
595		TimeOutRes = virtual_time_out(failure_enumeration_warning(A,B,C,D,critical)). % we have not investigated all possibilities; generate virtual time_out
596
597		critical_enumeration_warning_occured_in_error_scope :-
598	?	critical_enumeration_warning_occured_in_error_scope(_,_,_,_).
599		critical_enumeration_warning_occured_in_error_scope(A,B,C,D) :-
600	?	event_occurred_in_error_scope(enumeration_warning(A,B,C,D,critical)).
601
602		clear_enumeration_warnings :-
603		clear_events_in_current_error_scope(enumeration_warning(_,_,_,_,_)).
604
605		% retract events and raise real warnings
606		% Src and Msg used if these are not enumeration warnings
607		translate_events_in_current_scope_to_warnings(Src,Msg) :-
608		get_counter(cur_block_level,L),
609	?	retract(specific_event_occurred_at_level(L,Event)),
610		(translate_enumeration_warning(Event,EMsg,Span)
611		-> add_warning(enumeration_warning,EMsg,'',Span)
612		; add_warning(Src,Msg,Event)),
613		fail.
614		translate_events_in_current_scope_to_warnings(_,_).
615
616		% see also: print_enum_warning
617		translate_enumeration_warning(enumeration_warning(Enumerating,Type,Range,RestrictedRange,_Throwing), Msg,Span) :-
618		translate_enumeration_info(Enumerating,Info,Span),
619		ajoin(['Unbounded enumeration of ',Info,':',Type,', narrowing range: ',Range,' ---> ',RestrictedRange],Msg).
620		% Throwing=throwing -> print_pending_abort_info ?
621
622		translate_enumeration_info(enumerating(Info),Res,Span) :- !, translate_enumeration_info(Info,Res,Span). % TO DO: call get_trigger_info
623		translate_enumeration_info(b(identifier(Id),_,Info),Res,Span) :- !, Res=Id,Span=Info.
624		translate_enumeration_info(I,I,I).
625
626		% show all events in current error scope
627		portray_events_in_error_scope :- event_occurred_in_error_scope(E),
628		portray_event(E),fail.
629		portray_events_in_error_scope.
630
631		portray_event(enumeration_warning(Source,Type,Range,RestrictedRange,Critical)) :-
632		translate_enumeration_info(Source,Res,_Span), !,
633		format(' *** Enumeration Warning (~w): Source ~w, Type: ~w, Range reduction: ~w ---> ~w~n',
634		[Critical, Res, Type, Range, RestrictedRange]).
635		portray_event(E) :- format(' *** ~w~n',[E]).
636
637		% translate an event error to a short human readable form:
638		translate_error_event(Error,TransError) :-
639		(translate_enumeration_warning(Error,Msg,_)
640		-> TransError=Msg
641		; TransError=Error). % TODO: translate other errors
642
643		% -----------------------
644
645		:- volatile logged_error_hash/5, real_error_occurred/0, logged_error_spans/2, saved_subsidiary_span_pos/4.
646		:- dynamic logged_error_hash/5.
647		:- dynamic logged_message/4.
648		:- dynamic real_error_occurred/0, warning_occurred/0.
649		:- dynamic logged_error_spans/2.
650		:- dynamic saved_subsidiary_span_pos/4. % for Tcl/Tk
651
652
653		reset_real_error_occurred :-
654		(retract(real_error_occurred) -> true ; true),
655		(retract(warning_occurred) -> true ; true).
656
657		reset_errors :-
658		(reset_errors_but_not_scopes -> true
659		; format(user_error,'~n*** reset_errors_but_not_scopes failed!!~n',[]),
660		fail % something really bad happened
661		),
662		reset_error_limit_reached,
663		reset_error_scopes. % call if you want to start again at a fresh top-level, without error scopes
664		reset_errors_but_not_scopes :-
665		reset_real_error_occurred,
666		retractall(logged_error_hash(_,_,_,_,_)),
667		retractall(logged_message(_,_,_,_)),
668		reset_error_spans,
669		clear_error_context.
670
671		reset_error_span_if_required :-
672	?	(logged_error_hash(_,_,_,_,_) -> true
673		; retractall(logged_error_spans(_,_))).
674
675		reset_error_spans :-
676		retractall(logged_error_spans(_,_)),
677		retractall(saved_subsidiary_span_pos(_,_,_,_)).
678
679		wd_error_occured :-
680		test_error_occurred(well_definedness_error).
681
682		clear_wd_errors :-
683		clear_errors_with_source(well_definedness_error).
684		clear_errors_with_source(Source) :-
685		retractall(logged_error_spans(Source,_)),
686		retractall(logged_error_hash(_,Source,_S1,_TContext1,_Span1)),
687		retractall(logged_message(Source,_,_,_)),
688		(logged_error_hash(_,_Source2,_S2,_TContext2,_Span2) -> true
689		; reset_real_error_occurred).
690
691		print_error_span(Span) :- print_error_span(Span,error).
692		print_error_span(unknown,_) :- !.
693		print_error_span(none,_) :- !. % from Rodin
694		print_error_span([],_) :- !. % empty info list
695		print_error_span(Span,Kind) :-
696		extract_span_description(Span,PosMsg), !, % also detects info lists
697		print_error(Kind,PosMsg).
698		print_error_span(b(E,T,I),Kind) :-
699		translate_bexpr(b(E,T,I),S),!,
700		print_error(Kind,S).
701		print_error_span(span_predicate(P,_,_),Kind) :- translate_bexpr(P,S),!,
702		% can happen in Event-B when no position info can be extracted
703		print_error(Kind,S).
704		print_error_span(List,Kind) :- List = [_|_], % info list which was not recognised; probably Event-B mode
705		debug_mode(off),
706		!,
707		include(useful_info,List,UsefulList), % only show useful infos
708		(UsefulList = [] -> true
709		; print_error(Kind,UsefulList)).
710		print_error_span(Span,Kind) :- print_error(Kind,Span). % span not recognized !
711
712		useful_info(section(_)).
713		useful_info(used_ids(_)).
714
715
716		translate_bexpr(P,S) :-
717		(debug_mode(on) -> Lim=3000 ; Lim=1000),
718		translate:translate_subst_or_bexpr_with_limit(P,Lim,S).
719
720		% the same, but not using user_error and red and only printing when span recognised
721		% more detailed than translate:print_span
722		print_message_span(unknown) :- !.
723		print_message_span(Span) :-
724		extract_span_description(Span,PosMsg), !, print(PosMsg).
725		print_message_span(_). % span not recognized !
726
727		% try and extract a string (aka atom) describing the position
728		extract_span_description(span_predicate(P,_,_),PosMsg) :- !,
729		extract_span_description(P,PosMsg).
730		extract_span_description(b(E,_,I),PosMsg) :- !,
731		(extract_span_description(I,PosMsg) -> true
732		; first_sub_expr(E,A) -> extract_span_description(A,PosMsg)).
733		extract_span_description(Span,PosMsg) :-
734	?	extract_line_col(Span,StartLine,StartCol,EndLine,EndCol),!,
735		(empty_line_col(StartLine,StartCol,EndLine,EndCol)
736		-> POS = ['Unknown position'|POS2]
737		; POS = ['Line: ',StartLine,' Column: ',StartCol,
738		' until Line: ',EndLine,' Column: ',EndCol|POS2]
739		),
740		(extract_file_name(Span,Filename)
741		-> POS2 = [' in file: ',Filename|POS3] ; POS2 = POS3),
742	?	(extract_additional_description(Span,ContextMsg)
743		-> POS3 = [' within ',ContextMsg] ; POS3=[]),
744		ajoin(POS,PosMsg).
745		extract_span_description(Span,PosMsg) :-
746		extract_symbolic_span_desc(Span,Symbolic),!,
747		PosMsg=Symbolic.
748		extract_span_description(Span,PosMsg) :-
749		% try if we have an unknown position with a known context (e.g., pos_context(unknown,call_stack(...))
750		extract_additional_description(Span,ContextMsg),!,
751		%POS = ['Unknown position within ',ContextMsg],
752		POS = ['Within ',ContextMsg],
753		ajoin(POS,PosMsg).
754		% Note: Atom Plugin is quite sensitive to above error message and capitalization
755		% (https://github.com/wysiib/language-b-eventb)
756
757		extract_symbolic_span_desc(Span,PosMsg) :-
758		extract_symbolic_label_pos(Span,Symbolic),!,
759		% TO DO: we could try and find section for Rodin
760		ajoin(['@label: ',Symbolic],PosMsg).
761
762
763		% detect if a position is empty; Line 0, Column -1 .. Line 0, Column -2 used for non available Library Definition files
764		% happens, e.g., when typing CHOOSE({1}\{1}) in REPL
765		empty_line_col(0,N1,0,N2) :- integer(N1), integer(N2), N1>N2.
766
767		assert_true(Code) :-
768		(call(Code) -> true ; add_internal_error('Assertion failed: ',Code)).
769
770		add_error_fail(Source,ErrMsg, ErrTerm) :- add_error_and_fail(Source,ErrMsg, ErrTerm).
771		add_error_and_fail(Source,ErrMsg, ErrTerm) :- add_error(Source,ErrMsg, ErrTerm),fail.
772		add_error_and_fail(Source,ErrMsg) :- add_error(Source,ErrMsg),fail.
773
774		% add_error/2, add_error/3 and add_error/4
775		add_error(Source,ErrMsg) :- add_error4(Source,ErrMsg, '',unknown).
776		add_error(Source,ErrMsg, ErrTerm) :- add_error4(Source,ErrMsg, ErrTerm,unknown).
777		add_error(Source,ErrMsg,ErrTerm,Span) :- add_error4(Source,ErrMsg,ErrTerm,Span).
778
779		add_error4(Source,ErrMsg,ErrTerm,Span) :-
780		assert_real_error_occurred(Source),
781		combine_msg_and_error_term(ErrMsg,ErrTerm,Span,S),
782		add_error_or_warning(Source,S,Span).
783
784		%:- use_module(translate, [translate_error_term/2, translate_context/2]).
785		combine_msg_and_error_term(Msg,ErrTerm,_,Res) :- ErrTerm=='', !, Res=Msg.
786		combine_msg_and_error_term(ErrMsg,ErrTerm,Span,S) :-
787		string_concatenate(ErrMsg,' ',ST),
788		safe_translate_error_term(ErrTerm,Span,RString),
789		string_concatenate(ST,RString,S).
790
791
792		:- dynamic show_error_source/0.
793		show_error_source. % True if error source and span to be printed
794		turn_show_error_source_on :- (show_error_source -> true ; assertz(show_error_source)).
795		turn_show_error_source_off :- retractall(show_error_source).
796
797		trace_if_user_wants_it :- (preferences:get_preference(trace_upon_error,true) -> safe_trace ; true).
798
799		% try Prolog's trace; if this fails (compiled code), then ask user for input.
800		safe_trace :- translate:install_b_portray_hook,
801		catch(trace, error(existence_error(_,_),_), type_to_continue).
802
803		:- dynamic do_not_interrupt_user_anymore/0.
804
805		type_to_continue :- do_not_interrupt_user_anymore,!.
806		type_to_continue :- format(user_output,'(type <RETURN> to continue, z<RETURN> to zip) ===> ',[]),
807		read_line(user_input,X),
808		(zip(X) -> assertz(do_not_interrupt_user_anymore) ; true).
809
810		zip([122|_]). %starts with z
811
812
813		print_error_source(well_definedness_error) :- !,print_error('A well-definedness error occured !').
814		print_error_source(warning(Source)) :- show_error_source,!,
815		format_error_with_nl('~n! A warning occurred (source: ~w) !',[Source]).
816		print_error_source(internal_error(Source)) :- show_error_source,!,
817		flush_output, % internal error should not happen; be sure to flush all other pending outputs so that we can see where it happened
818		format_error_with_nl('~n! An internal error occurred (source: ~w) !',[Source]).
819		print_error_source(Source) :- show_error_source,!,
820		format_error_with_nl('~n! An error occurred (source: ~w) !',[Source]).
821		print_error_source(_).
822
823		print_error_context(Kind,Context) :- ((Context = '' ; \+show_error_source) -> true ; print_error(Kind,Context)).
824
825		print_error(message,Term) :- !, print_message_on_stream(user_output,[blue],Term).
826		print_error(_,Term) :- print_error(Term).
827
828		safe_translate_error_term(ErrTerm,Span,RString) :-
829		temporary_set_preference(expand_avl_upto,5,CHNG),
830		translate:translate_error_term(ErrTerm,Span,RString),
831		reset_temporary_preference(expand_avl_upto,CHNG).
832
833		safe_translate_context(Result) :-
834		% avoid infinite loop when error occurs inside translate_context
835		current_context(Context),
836		!,
837		set_error_context(translate_context),
838		temporary_set_preference(expand_avl_upto,4,CHNG),
839		(translate:translate_context(Context,TContext)
840		-> true ; TContext=Context),
841		reset_temporary_preference(expand_avl_upto,CHNG),
842		restore_error_context(Context),
843		Result=TContext.
844		safe_translate_context(''). % no context
845
846		is_optional_error_or_warning(warning(Src)) :- !, optional_error_or_warning(Src).
847		is_optional_error_or_warning(Src) :- optional_error_or_warning(Src).
848
849		add_error_or_warning(Source,ErrMsg,Span) :-
850		safe_translate_context(Context),
851		reset_error_span_if_required,
852		simplify_span(Span,SSpan), % for better hashing, assertz, retract
853		assertz_logged_error_if_new(Source,ErrMsg,Context,SSpan,New),
854		log_error_or_msg(Source,ErrMsg,SSpan),
855		(New=false -> true
856		; is_optional_error_or_warning(Source) ->
857		(extract_span_description(SSpan,PosMsg) -> true ; PosMsg=''),
858		formatsilentmsg(user_output,'% Optional error ~w occured: ~w ~w~n',[Source,ErrMsg,PosMsg]),
859		register_error_span(Source,SSpan,_)
860		; register_error_span(Source,SSpan,NewSrcSpan),
861		(NewSrcSpan=false,
862		error_limit_reached,
863		Source \= internal_error(_) % always show internal errors
864		-> true % this is not a new Source,SSpan combination and we have already several errors;
865		; print_error_source(Source),
866		print_error(ErrMsg),
867		print_error_context(error,Context),
868		print_error_span(SSpan)
869		),
870		trace_if_user_wants_it
871		).
872
873		% optionally log errors in to a ndsjon logfile
874		log_error_or_msg(Source,ErrMsg,Span) :- get_preference(error_log_file,LogFile),
875		LogFile \= '',
876		decompose_error_source(Source,Type,Src),
877		!,
878		ndjson_log(Type,Src,ErrMsg,Span,LogFile).
879		log_error_or_msg(_,_,_).
880
881		% log error, warning or message to NDJSON log file
882		% Type is warning, error, info
883		:- use_module(tools_io,[intelligent_open/4]).
884		ndjson_log(Type,Src,ErrMsg,Span,LogFile) :-
885		force_extract_position_from_span(Span,Filename,StartLine,StartCol,EndLine,EndCol),
886		catch(intelligent_open(LogFile,append,S,[encoding(utf8)]), E,
887		(format(user_error,'~n*** Cannot open error log file: ~w~n*** Exception: ~w~n',[LogFile,E]),fail)),
888		!,
889		ndjson_write(S,Type,ErrMsg,Src,Filename,StartLine,StartCol,EndLine,EndCol),
890		(extract_additional_pos_and_descr(Span,SubPos,_Desc),
891		extract_position_from_span(SubPos,Filename2,StartLine2,StartCol2,EndLine2,EndCol2),
892		ndjson_write(S,Type,ErrMsg,Src,Filename2,StartLine2,StartCol2,EndLine2,EndCol2),
893		fail
894		;
895		true
896		),
897		close(S).
898		ndjson_log(_,_,_,_,_).
899
900		% assign position to main file if we cannot extract the precise position
901		force_extract_position_from_span(Span,Filename,StartLine,StartCol,EndLine,EndCol) :-
902		extract_position_from_span(Span,Filename,StartLine,StartCol,EndLine,EndCol),!.
903		force_extract_position_from_span(_Span,Filename,StartLine,StartCol,EndLine,EndCol) :-
904		bmachine:b_get_main_filenumber(MainFN),
905		get_filename(MainFN,Filename),!,
906		% generate a virtual position, so that global errors without position are shown in Atom, VSCode,...
907		StartLine=1,StartCol=1,EndLine=1,EndCol=1.
908		force_extract_position_from_span(_Span,Filename,StartLine,StartCol,EndLine,EndCol) :-
909		specfile:currently_opened_file_status(Filename,_),
910		StartLine='-1',StartCol='-1',EndLine='-1',EndCol='-1'.
911
912		%ndjson format http://ndjson.org
913		% one JSON term per line
914		:- use_module(extrasrc(json_parser),[json_write_stream/2]).
915		ndjson_write(S,Type,ErrMsg,Src,Filename,StartLine,StartCol,EndLine,EndCol) :-
916		version:version_str(Version),
917		Term = json([type=string(Type), % Type is warning, error, info
918		message=string(ErrMsg),
919		reason=string(Src),
920		file=string(Filename),
921		start=json([line=number(StartLine),col=number(StartCol)]),
922		end=json([line=number(EndLine),col=number(EndCol)]),
923		version=string(Version)
924		]),
925		json_write_stream(S,Term), nl(S).
926
927		decompose_error_source(warning(Source),warning,Res) :- !, Res=Source.
928		decompose_error_source(internal_error(Source),internal_error,Res) :- !, Res=Source.
929		decompose_error_source(message(Source),information,Res) :- !, Res=Source. % mainly for NDJSON
930		decompose_error_source(Msg,error,Msg).
931
932
933		% the total number of errors since start; no way to reset this; useful for validation reports
934		% TO DO: maybe use counter extension; but tricky to get dependency and initialisation right
935		get_total_number_of_errors(X) :-
936		(bb_get(total_number_of_errors,R) -> X=R
937		; X=0).
938
939		inc_total_number_of_errors :-
940		(bb_get(total_number_of_errors,R)
941		-> R1 is R+1, bb_put(total_number_of_errors,R1)
942		; bb_put(total_number_of_errors,1)).
943
944
945		total_number_of_errors_at_last_reset(Res) :-
946		(bb_get(total_number_of_errors_at_last_reset,R) -> Res=R ; Res=0).
947
948		reset_error_limit_reached :-
949		bb_put(error_limit_reached_printed,false),
950		get_total_number_of_errors(T),
951		bb_put(total_number_of_errors_at_last_reset,T).
952
953		error_limit_reached :- bb_get(error_limit_reached_printed,true),!.
954		error_limit_reached :- get_total_number_of_errors(Nr), Nr >= 100,
955		total_number_of_errors_at_last_reset(Last), Delta is Nr-Last, Delta >= 100,
956		format_error_with_nl('Error limit reached (total: ~w, delta: ~w); only printing new error source and locations!',[Nr,Delta]),
957		bb_put(error_limit_reached_printed,true).
958
959		assert_warning_occured :-
960		(preferences:get_preference(strict_raise_warnings,true)
961		-> assert_real_error_occurred(warning)
962		; warning_occurred -> true
963		; assertz(warning_occurred)).
964		assert_real_error_occurred(Source) :-
965		(real_error_occurred -> true ; assertz(real_error_occurred)),
966		inc_total_number_of_errors,
967		assert_real_error_in_current_block(Source).
968
969		:- use_module(hashing,[term_depth_hash/3]).
970		assertz_logged_error_if_new(Source,S,TContext,Span,New) :-
971		% limit depth mainly for TContext/Span; avoiding generating many similar error messages with same msg
972		% however, for WD errors often the msg varies (e.g. argument for function application); so this will not prevent a lot of errors
973		term_depth_hash(logged_error_hash(Source,S,TContext,Span),4,Hash),
974		(logged_error_hash(Hash,Source,S,TContext,Span)
975		-> debug_println(repeated_error(Hash)),New=false
976		; %print(new(Hash,Source,S,TContext,Span)),nl,
977		assertz(logged_error_hash(Hash,Source,S,TContext,Span)),
978		New=true).
979
980	?	logged_error(Source,S,TContext,Span) :- logged_error_hash(_Hash,Source,S,TContext,Span).
981
982		add_warning(Source,ErrMsg, ErrTerm) :-
983		add_warning(Source,ErrMsg, ErrTerm,unknown).
984		add_warning(Source,ErrMsg, ErrTerm,Span) :-
985		safe_translate_error_term(ErrTerm,Span,RString),
986		string_concatenate(ErrMsg,RString,S),
987		assert_warning_occured,
988		add_error_or_warning(warning(Source),S,Span).
989		add_warning(Source,Message) :-
990		assert_warning_occured,
991		add_error_or_warning(warning(Source),Message,unknown).
992
993		% MESSAGES
994
995		% add message in debug mode
996		add_debug_message(Source,ErrMsg, ErrTerm) :-
997		add_debug_message(Source,ErrMsg, ErrTerm,unknown).
998		add_debug_message(Source,ErrMsg, ErrTerm, Span) :-
999		debug_mode(on),!,
1000		add_message(Source,ErrMsg, ErrTerm, Span).
1001		add_debug_message(_,_,_,_).
1002
1003
1004		% a predicate to flexibly call add_error, add_warning or add_message
1005		add_msg_warn_or_err(debug_message,Src,Msg,Term,Pos) :- !, add_debug_message(Src,Msg,Term,Pos).
1006		add_msg_warn_or_err(message,Src,Msg,Term,Pos) :- !, add_message(Src,Msg,Term,Pos).
1007		add_msg_warn_or_err(warning,Src,Msg,Term,Pos) :- !, add_warning(Src,Msg,Term,Pos).
1008		add_msg_warn_or_err(_Kind,Src,Msg,Term,Pos) :- add_error(Src,Msg,Term,Pos).
1009
1010		add_message(Source,ErrMsg, ErrTerm) :- /* same as add_error but does not add err msg */
1011		add_message(Source,ErrMsg, ErrTerm,unknown).
1012
1013		add_message(_,_, _,unknown) :- error_manager_silent_mode(on),!.
1014		add_message(Source,ErrMsg, ErrTerm,Span) :- /* same as add_error but does not add err msg */
1015		safe_translate_error_term(ErrTerm,Span,RString),
1016		string_concatenate(ErrMsg,RString,S),
1017		add_message_direct(Source, S),
1018		safe_translate_context(Context),
1019		print_error_context(message,Context),
1020		print_error_span(Span,message),
1021		log_error_or_msg(message(Source),S,Span),
1022		assertz(logged_message(Source,S,Context,Span)).
1023
1024		add_message(_,_) :- error_manager_silent_mode(on),!.
1025		add_message(Source,ErrMsg) :- add_message_direct(Source,ErrMsg).
1026
1027		add_message_direct(Source,ErrMsg) :-
1028		(show_error_source -> format_with_colour(user_output,[light_gray],'! Message (source: ~w):~n',[Source]) ; true),
1029		print_error(message,ErrMsg).
1030
1031
1032		% adds a list of errors with position information
1033		% [error(Msg,Pos)] or [warning(Msg,Pos)...]
1034		no_real_perror_occurred([]).
1035		no_real_perror_occurred([warning(_,_)|T]) :- no_real_perror_occurred(T).
1036
1037		add_all_perrors(Errors) :- add_all_perrors(Errors,[],bmachine).
1038		add_all_perrors(Errors,Files) :- add_all_perrors(Errors,Files,bmachine).
1039		add_all_perrors(Errors,Files,Context) :- add_all_perrors(Errors,Files,Context,0,100,error).
1040		add_all_perrors(Errors,Files,Context,WarnOrErr) :-
1041		add_all_perrors(Errors,Files,Context,0,100,WarnOrErr).
1042
1043		add_all_perrors([],_,_,_,_,_).
1044		add_all_perrors([H|Rest],_Filenames,ContextOfError,NrOfErrors,MaxErrors,WarnOrErr) :-
1045		NrOfErrors >= MaxErrors,!,
1046		length([H|Rest],Len),
1047		add_msg_warn_or_err(WarnOrErr,ContextOfError,
1048		'Reached maximium number of errors; number of errors not reported: ',
1049		Len,unknown).
1050		add_all_perrors([Error|Rest],Filenames,ContextOfError,NrOfErrors,MaxErrors,WarnOrErr) :-
1051		get_perror(Error,ParseErrOrWarn,Msg,Pos),
1052		extract_perror_pos(Pos,Filenames,NewPos),
1053		(ParseErrOrWarn == warning -> add_warning(ContextOfError,Msg,'',NewPos)
1054		; ParseErrOrWarn = internal_error -> add_internal_error(ContextOfError,Msg,'',NewPos)
1055		; add_msg_warn_or_err(WarnOrErr,ContextOfError,Msg,'',NewPos)),
1056		N1 is NrOfErrors+1,
1057		add_all_perrors(Rest,Filenames,ContextOfError,N1,MaxErrors,WarnOrErr).
1058
1059		extract_perror_pos(Pos,Filenames,ResPOS) :-
1060		get_position_row_cols(Pos,Srow,Scol,Erow,Ecol),
1061		get_position_filenumber(Pos,Filenumber),!,
1062		( get_filename(Filenumber,Filenames,Filename)
1063		%Ecol1 is Ecol+1,
1064		-> ResPOS = src_span(Filenumber,Filename,Srow,Scol,Erow,Ecol,[],[])
1065		% ; Filenumber = -1, Filenames=[FN] -> % just a single filename, e.g., in VisB parsing
1066		% % TODO: we need to adjust line and column numbers using a reference position
1067		% POS = src_position_with_filename_and_ec(Srow,Scol,Erow,Ecol,FN)
1068		; ResPOS = src_span(Srow,Scol,Erow,Ecol,[],[])
1069		).
1070		extract_perror_pos(pos(Srow,Scol,Filename),Files,POS) :- !, % deprecated ?
1071		adapt_null_file_name(Filename,Files,Filename2),
1072		S1 is Scol+0, % zero width span
1073		POS = src_position_with_filename_and_ec(Srow,Scol,Srow,S1,Filename2).
1074		extract_perror_pos(pos(Srow,Scol,Erow,Ecol,Filename),Files,POS) :- !,
1075		adapt_null_file_name(Filename,Files,Filename2),
1076		%Ecol1 is Ecol+1,
1077		POS = src_position_with_filename_and_ec(Srow,Scol,Erow,Ecol,Filename2).
1078		extract_perror_pos(pos(Srow,Scol),_,POS) :- !, print(deprecated_pos(Srow,Scol)),nl,
1079		POS = src_position(Srow,Scol,none,1).
1080		extract_perror_pos(Pos,_,Pos).
1081
1082		% adapt filename
1083		adapt_null_file_name(null,[File],Res) :-
1084		!, % the error is not associated to a given file, but we have a file list with just a single file;
1085		% occurs e.g. when parsing VisB JSON files
1086		Res=File.
1087		adapt_null_file_name(F,_,F).
1088
1089		get_perror(error(Msg,Pos),error,Msg,Pos) :- !.
1090		get_perror(internal_error(Msg,Pos),internal_error,Msg,Pos) :- !.
1091		get_perror(warning(Msg,Pos),warning,Msg,Pos) :- !.
1092		get_perror(M,_,M,unknown) :- format(user_error,'*** unknown perror: ~w~n',[M]).
1093
1094		% version without list of filenames
1095		get_filename(Filenumber,Filename) :-
1096		bmachine:b_get_all_used_filenames(FN),
1097		get_filename(Filenumber,FN,Filename).
1098
1099		get_filename(Filenumber,Filenames,Filename) :-
1100		number(Filenumber),!,
1101		nth1(Filenumber,Filenames,Filename).
1102		get_filename(N,F,R) :-
1103		add_internal_error('Cannot get filename: ',get_filename(N,F,R)),
1104		N=1,F=[R|_]. % return first file if possible
1105
1106		% check if error/warning occured and retract matching error/warning
1107		get_error_with_span(Source,ErrMsg,Span) :-
1108	?	retract(logged_error_hash(_Hash,Source,ErrMsg,_Context,Span)).
1109		get_error(Source,ErrMsg) :-
1110	?	retract(logged_error_hash(_,Source,ErrMsg,_,_)).
1111		get_warning(Source,ErrMsg) :-
1112		retract(logged_error_hash(_,warning(Source),ErrMsg,_,_)).
1113
1114		% now the same without actually retracting the error/warning:
1115	?	check_error_occured(Source,ErrMsg) :- logged_error(Source,ErrMsg,_,_).
1116		check_warning_occured(Source,ErrMsg) :- logged_error(warning(Source),ErrMsg,_,_).
1117
1118		get_next_error_or_warning(Msg) :- get_error_or_message(_Src,Type,Msg),
1119		Type \= message. % retract message, but do not return it
1120		get_error_or_message(Source,Type,Msg) :-
1121		retract_logged_error_or_message(Source,Type,ErrMsg,Context,Span),
1122		(extract_line_col(Span,StartLine,StartCol,EndLine,EndCol)
1123		-> POS = ['\n ### Line: ',StartLine,', Column: ',StartCol|POS1],
1124		((StartLine,StartCol) \= (EndLine,EndCol)
1125		-> (StartLine=EndLine -> POS1 = [' until ',EndCol|POS2]
1126		; POS1 = ['\n ### until Line: ',EndLine,', Column: ',EndCol|POS2]
1127		)
1128		; POS1 = POS2
1129		),
1130		(extract_additional_description(Span,CMsg)
1131		-> POS2 = ['\n ### within: ',CMsg,'\n\n']
1132		; POS2 = ['\n\n']
1133		),
1134		(extract_relative_file_name(Span,Filename)
1135		-> PosMsg = ['\n ### File: ',Filename | POS]
1136		; PosMsg = POS
1137		),
1138		tools:ajoin(PosMsg,EndStr)
1139		; extract_symbolic_span_desc(Span,CMsg)
1140		-> tools:ajoin(['\n ### ',CMsg,'\n\n'],EndStr)
1141		; EndStr = '\n\n'
1142		),
1143		(empty_error_context(Context)
1144		-> string_concatenate(ErrMsg,EndStr,S0)
1145		; safe_translate_error_term(Context,Span,CString),
1146		string_concatenate(CString,EndStr,CString2),
1147		string_concatenate('\n',CString2,CString3), % prefix used to be ': Context ='
1148		string_concatenate(ErrMsg,CString3,S0)
1149		),
1150		(debug_mode(off) -> Msg = S0
1151		; decompose_error_source(Source,_,SrcAtom),
1152		string_concatenate(SrcAtom,': ',S1),
1153		string_concatenate(S1,S0,Msg)
1154		).
1155
1156		empty_error_context('').
1157		empty_error_context('???').
1158
1159
1160		% retract an error
1161		retract_logged_error_or_message(Source,Type,ErrMsg,Context,Span) :- Type \== message,
1162		retract(logged_error_hash(_Hash,Source,ErrMsg,Context,Span)),
1163		(Source = warning(_) -> Type=warning
1164		; Source = internal_error(_) -> Type=internal_error
1165		; Type=error).
1166		retract_logged_error_or_message(message(Source),message,ErrMsg,Context,Span) :-
1167		retract(logged_message(Source,ErrMsg,Context,Span)).
1168
1169
1170		get_error_with_span_info(FullErrMsg,Type,ErrLocations) :-
1171		retract_logged_error_or_message(_Source,Type,ErrMsg,Context,Span),
1172		(empty_error_context(Context) -> FullErrMsg=ErrMsg
1173		; safe_translate_error_term(Context,Span,CString),
1174		ajoin([ErrMsg,'\n',CString],FullErrMsg)
1175		),
1176		findall( error_span(Filename,StartLine,StartCol,EndLine,EndCol),
1177		extract_position_from_span(Span,Filename,StartLine,StartCol,EndLine,EndCol),
1178		ErrLocations).
1179		get_error_with_span_and_context(ErrMsg,Type,ErrLocations,GlobalContext,SpanContext) :-
1180		% Global context: top-level info about what ProB was doing
1181		% Local SpanContext: definition call hierarchy or call stack
1182		retract_logged_error_or_message(_Source,Type,ErrMsg,GlobalContext,Span),
1183		(extract_additional_description(Span,SpanContext) -> true ; SpanContext=''),
1184		findall( error_span(Filename,StartLine,StartCol,EndLine,EndCol),
1185		extract_position_from_span(Span,Filename,StartLine,StartCol,EndLine,EndCol),
1186		ErrLocations).
1187
1188		extract_position_from_span(Span,Filename,StartLine,StartCol,EndLine,EndCol) :-
1189		extract_line_col(Span,StartLine,StartCol,EndLine,EndCol),
1190		(extract_file_name(Span,FName) -> Filename=FName ; Filename='').
1191
1192		% Tcl/Tk interface of SICStus cannot deal with certain strange Unicode symbols
1193		% see prob_examples/public_examples/B/Puzzles/LogicQuestion.mch where code 55349 appears
1194		tk_escape(Atom,EAtom) :- atom(Atom),!,
1195		atom_codes(Atom,C),
1196		maplist(tk_escape_code,C,EC),
1197		atom_codes(EAtom,EC).
1198		tk_escape(list(L),list(EL)) :- !, maplist(tk_escape,L,EL).
1199		tk_escape(X,X).
1200
1201		tk_escape_code(StrangeUnicode,Res) :-
1202		StrangeUnicode > 55000,!, % not sure what the limit should be here
1203		Res = 9633. % white box
1204		tk_escape_code(Code,Code).
1205
1206		tcltk_get_all_errors(Limit,list(ERes),NrErrorsShown,NrErrors) :-
1207		get_all_errors(All),
1208		length(All,NrErrors),
1209		(NrErrors =< Limit -> Res = All, NrErrorsShown = NrErrors
1210		; prefix_length(All,Res,Limit), % truncate
1211		NrErrorsShown = Limit
1212		),
1213		tk_escape(list(Res),list(ERes)).
1214
1215
1216		get_all_errors(All) :-
1217		findall(Err,get_next_error_or_warning(Err),All),
1218		All \= [],
1219		clear_error_context.
1220
1221		get_all_errors_and_clear(All) :-
1222		findall(Err,get_next_error_or_warning(Err),All),
1223		reset_errors_but_not_scopes,
1224		All \= [].
1225		get_all_errors_and_reset(All) :-
1226		findall(Err,get_next_error_or_warning(Err),All),
1227		reset_errors, % fresh top-level
1228		All \= [].
1229		get_all_errors_with_span_info_and_reset(All) :-
1230		findall(error(ErrMsg,ErrType,ErrLocations),
1231		get_error_with_span_info(ErrMsg,ErrType,ErrLocations),All),
1232		reset_errors.
1233		get_all_errors_with_span_and_context_and_reset(All) :-
1234		findall(error(ErrMsg,ErrType,ErrLocations,GlobalContext,SpanContext),
1235		get_error_with_span_and_context(ErrMsg,ErrType,ErrLocations,GlobalContext,SpanContext),All),
1236		reset_errors.
1237
1238
1239		error_or_warning_occured :- logged_error(_Source,_,_,_),!.
1240	?	test_error_occurred(Source) :- logged_error(Source,_,_,_),real_error_occurred,!.
1241
1242		%:- use_module(library(lists),[length/2]). length is builtin
1243
1244		count_errors_occurred(Source,NrOfErrors) :-
1245		findall(1,logged_error(Source,_,_,_),Ls),
1246		length(Ls,NrOfErrors).
1247
1248		display_error_statistics :- findall(Source,logged_error(Source,_,_,_),L),
1249		count_occurences(L,Occ),
1250		format('Error manager summary: ~w~n',[Occ]).
1251
1252
1253
1254
1255		% ERROR CONTEXTS
1256		% --------------
1257
1258		/* add context information; will be added to any error messages */
1259		% Note: Each Prolog module maintains its own blackboard for bb_get/bb_put
1260		set_error_context(Ctx) :- bb_put(error_manager_context,Ctx).
1261
1262		clear_error_context :- (bb_delete(error_manager_context,_) -> true ; true).
1263		% retractall with dynamic predicate seems to slow down
1264
1265		current_context(C) :- bb_get(error_manager_context,C).
1266
1267		get_error_context(C) :- (current_context(C) -> true ; C='???').
1268		print_error_context :- (safe_translate_context(R), R\='' -> print_error(error,R) ; true).
1269
1270		% restore an error context obtained by get_error_context
1271		restore_error_context('???') :- !, clear_error_context.
1272		restore_error_context(C) :- set_error_context(C).
1273
1274
1275		% -----------------
1276
1277		get_error_span(Source,Span) :-
1278		retract(logged_error_spans(Source,Span)).
1279
1280		% a way for external modules to register error locations, e.g., for display by Tcl/Tk HighlightSyntaxErrors
1281		register_error_span(Source,Span) :- register_error_span(Source,Span,_).
1282		register_error_span(_,unknown,New) :- !,New=false.
1283		register_error_span(Source,Span,New) :- logged_error_spans(Source,Span),!,New=false.
1284		register_error_span(Source,Span,New) :- assertz(logged_error_spans(Source,Span)),New=true.
1285
1286		get_error_span_linecol(Line,Col,EndLine,EndCol) :- get_error_span_linecol(_Source,Line,Col,EndLine,EndCol).
1287		get_error_span_linecol(Source,Line,Col,EndLine,EndCol) :-
1288		get_error_span(Source,Span), % looks at logged_error_spans and retracts
1289		extract_line_col(Span,Line,Col,EndLine,EndCol).
1290
1291		% gets repeatedly called from Tcl/Tk to get all error locations
1292		tk_get_error_span_linecol_for_main_file(Line,Col,EndLine,EndCol) :-
1293		retract(saved_subsidiary_span_pos(Line,Col,EndLine,EndCol)).
1294		tk_get_error_span_linecol_for_main_file(Line,Col,EndLine,EndCol) :-
1295		get_error_span(_Source,Span), % looks at logged_error_spans and retracts even if not in main file !
1296		(extract_primary_line_col_for_main_file(Span,Line,Col,EndLine,EndCol)
1297		-> (extract_additional_pos_and_descr(Span,SubPos,_),
1298		extract_line_col_for_main_file(SubPos,SLine,SCol,SEndLine,SEndCol),
1299		assertz(saved_subsidiary_span_pos(SLine,SCol,SEndLine,SEndCol)), % store for later lookup
1300		fail
1301		; true)
1302		; % try finding subsidiary position which is in main file:
1303		extract_additional_pos_and_descr(Span,SubPos,_),
1304		extract_line_col_for_main_file(SubPos,Line,Col,EndLine,EndCol)
1305		).
1306
1307
1308		% just like get_error_span_linecol but does not retract and gets Filename
1309		check_error_span_file_linecol(Source, FullFilename,Line,Col,EndLine,EndCol) :-
1310	?	logged_error_spans(Source,Span),
1311		(extract_file_line_col(Span,FullFilename,Line,Col,EndLine,EndCol)
1312		;
1313	?	extract_additional_pos_and_descr(Span,SubPos,_),
1314		extract_file_line_col(SubPos,FullFilename,Line,Col,EndLine,EndCol)).
1315
1316		extract_file_line_col(Span,FullFilename,Line,Col,EndLine,EndCol) :-
1317		(extract_file_number_and_name(Span,_,FullFilename)
1318		-> true
1319		; FullFilename = unknown), % e.g. something like src_span/6; should we return unknown('?')
1320	?	extract_line_col(Span,Line,Col,EndLine,EndCol).
1321
1322		% try and extract symbolic (Rodin label) information
1323		extract_symbolic_label_pos(span_predicate(P,_,_),PosMsg) :- !,
1324		extract_symbolic_label_pos(P,PosMsg).
1325		extract_symbolic_label_pos(b(E,_,I),PosMsg) :- !,
1326		(extract_symbolic_label_pos(I,PosMsg) -> true
1327		; first_sub_expr(E,A) -> extract_symbolic_label_pos(A,PosMsg)).
1328		extract_symbolic_label_pos([],_) :- !,fail.
1329		extract_symbolic_label_pos([H|T],SymbolicPos) :- !,
1330		posinfo_member(N,[H|T]),
1331		extract_symbolic_label_pos(N,SymbolicPos),!.
1332		extract_symbolic_label_pos(rodinpos(Label,_),Label). % see also get_texpr_labels in bsyntaxtree
1333		extract_symbolic_label_pos(rodinpos(Model,Name,_),Label) :- ajoin([Model,':',Name],Label).
1334		extract_symbolic_label_pos(rodin_derived_context_pos(Model,Context,LabelName),Label) :-
1335		ajoin([Model,'.',Context,':',LabelName],Label).
1336		extract_symbolic_label_pos(label(Label),Label).
1337
1338		% just extract label, without model
1339		extract_symbolic_label(span_predicate(P,_,_),PosMsg) :- !,
1340		extract_symbolic_label(P,PosMsg).
1341		extract_symbolic_label(b(E,_,I),PosMsg) :- !,
1342		(extract_symbolic_label(I,PosMsg) -> true
1343		; first_sub_expr(E,A) -> extract_symbolic_label(A,PosMsg)).
1344		extract_symbolic_label([H|T],SymbolicPos) :- !,
1345		posinfo_member(N,[H|T]),
1346		extract_symbolic_label(N,SymbolicPos),!.
1347		extract_symbolic_label(rodinpos(Label,_),Label) :- Label \= []. % see also get_texpr_labels in bsyntaxtree
1348		extract_symbolic_label(rodinpos(_Model,Label,_),Label) :- Label \= [].
1349		extract_symbolic_label(rodin_derived_context_pos(_Model,_Context,Label),Label) :- Label \= [].
1350		extract_symbolic_label(label(Label),Label) :- Label \= [].
1351
1352		% quickly try and simplify a span, e.g., before asserting it in a fact (as it may become big)
1353		simplify_span(b(E,_,Infos),Res) :- !,
1354	?	(definite_posinfo_member(N,Infos) -> Res=N
1355		; first_sub_expr(E,A) -> simplify_span(A,Res)
1356		; Res=unknown).
1357		simplify_span(Infos,Res) :- Infos = [_|_],!,
1358	?	(definite_posinfo_member(N,Infos) -> Res=N ; Res=unknown).
1359		simplify_span(span_predicate(P,_,_),Res) :- !, simplify_span(P,Res).
1360		simplify_span(S,S).
1361
1362		% choose first sub-expression in case top-expression has no position info (it would be better if extract_info/3 in bsyntaxtree merges position info)
1363		first_sub_expr(negation(A,_),A).
1364		first_sub_expr(conjunct(A,_),A).
1365		first_sub_expr(disjunct(A,_),A).
1366		first_sub_expr(implication(A,_),A).
1367		first_sub_expr(equivalence(A,_),A).
1368		first_sub_expr(exists([A|_],_),A).
1369		first_sub_expr(forall([A|_],_),A).
1370		first_sub_expr(let_predicate([A|_],_,_),A).
1371		first_sub_expr(let_expression([A|_],_,_),A).
1372		first_sub_expr(let_expression_global([A|_],_,_),A).
1373		first_sub_expr(sequence([A|_]),A).
1374		first_sub_expr(parallel([A|_]),A).
1375		first_sub_expr(assign([A|_],_),A).
1376		first_sub_expr(var([A|_],_),A).
1377		first_sub_expr(equal(A,_),A).
1378		first_sub_expr(not_equal(A,_),A).
1379		first_sub_expr(function(A,_),A).
1380		first_sub_expr(less(A,_),A).
1381		first_sub_expr(less_equal(A,_),A).
1382		% TO DO: use bsyntaxtree:syntaxtraversion
1383
1384		:- use_module(tools_positions,[get_position_filenumber/2, get_position_row_cols/5]).
1385
1386		% extract_line_col(S,_,_,_,_) :- print(extract(S)),nl,fail.
1387		extract_line_col(Var,_,_,_,_) :- var(Var),!, write(variable_span(Var)),nl,
1388		fail.
1389		extract_line_col([],_,_,_,_) :- !,fail.
1390		extract_line_col([H|T],Srow,Scol,Erow,Ecol) :- !,
1391		posinfo_member(N,[H|T]),
1392		extract_line_col(N,Srow,Scol,Erow,Ecol),!.
1393		extract_line_col(closure(_,_,B),Srow,Scol,Erow,Ecol) :- !,
1394		extract_line_col(B,Srow,Scol,Erow,Ecol).
1395		extract_line_col(b(E,_,Infos),Srow,Scol,Erow,Ecol) :- !,
1396		(extract_line_col(Infos,Srow,Scol,Erow,Ecol) -> true
1397		; first_sub_expr(E,A) -> extract_line_col(A,Srow,Scol,Erow,Ecol)).
1398		extract_line_col(span_predicate(P,_,_),Srow,Scol,Erow,Ecol) :- !,
1399		extract_line_col(P,Srow,Scol,Erow,Ecol).
1400		extract_line_col(PosTerm,Srow,S1,Erow,E1) :-
1401		get_position_row_cols(PosTerm,Srow,Scol,Erow,Ecol),
1402		number(Srow),
1403		% _Filenumber is an index into list provided by b_get_all_used_filenames
1404		number(Scol), number(Erow), number(Ecol),
1405		!,
1406		(Scol>0 -> S1 is Scol-1 ; S1 = Scol), % the BParser starts column numbering at 1
1407		(Ecol>0 -> E1 is Ecol-1 ; E1 = Ecol).
1408		%E1=Ecol. %Somehow the Ecol info is ok for Tcl
1409		extract_line_col(unknown,_,_,_,_) :- !,fail.
1410		extract_line_col(pos_context(A,_,_),StartLine,StartCol,EndLine,EndCol) :- !,
1411		extract_line_col(A,StartLine,StartCol,EndLine,EndCol).
1412		extract_line_col(src_span(_Filenr,_Filename,StartLine,SC,EndLine,EC,Offset,LenBytes),StartLine,StartCol,EndLine,EndCol)
1413		:- !,
1414		extract_line_col(src_span(StartLine,SC,EndLine,EC,Offset,LenBytes),StartLine,StartCol,EndLine,EndCol).
1415		extract_line_col(src_span(SL,SC,EL,EC,_Off,_LenBytes),StartLine,StartCol,EndLine,EndCol) :- !,
1416		StartLine=SL, StartCol is SC-1,
1417		EndLine = EL, EndCol is EC-1.
1418		%:- !, StartCol is SC-1, EndCol is StartCol+LenBytes, EndLine = StartLine. %% fix because new library generates erroneous EndLine/EndCol info
1419		% EndCol is EC-1.
1420	?	extract_line_col(span_info(_Info,Span),SL,SC,EL,EC) :- !, extract_line_col(Span,SL,SC,EL,EC).
1421		extract_line_col(src_span_operator(SP1,SP2),SL,SC,EL,EC) :- !,
1422		(extract_line_col(SP1,SL,SC,EL,EC) ; extract_line_col(SP2,SL,SC,EL,EC)).
1423		extract_line_col(multi_span(SL,SC,EL,EC,_Off,_Len,TAIL),StartLine,StartCol,EndLine,EndCol) :- !,
1424		% TO DO: replace by multi_span/2
1425		( StartLine = SL, StartCol is SC-1,
1426		EndLine = EL, EndCol is EC-1
1427		; extract_line_col(TAIL,StartLine,StartCol,EndLine,EndCol)).
1428		%extract_line_col(multi_span(A,B),StartLine,StartCol,EndLine,EndCol) :- !,
1429		% (extract_line_col(A,StartLine,StartCol,EndLine,EndCol) ;
1430		% extract_line_col(B,StartLine,StartCol,EndLine,EndCol)).
1431		extract_line_col(src_position(StartLine,SC,_Off,LenBytes),StartLine,StartCol,EndLine,EndCol) :- !,
1432		StartCol is SC-1, EndCol is StartCol+LenBytes, EndLine is StartLine.
1433		extract_line_col(src_position_with_filename(StartLine,SC,LenBytes,_Filename),StartLine,StartCol,EndLine,EndCol) :-
1434		!,
1435		StartCol is SC-1, EndCol is StartCol+LenBytes, EndLine is StartLine.
1436		extract_line_col(src_position_with_filename_and_ec(SL,SC,EL,EC,_Fname),StartLine,StartCol,EndLine,EndCol) :-
1437		!,
1438		StartLine=SL,StartCol is SC-1,EndLine = EL, EndCol is EC-1.
1439		extract_line_col(lineCol(StartLine,StartCol),StartLine,StartCol,EndLine,EndCol) :- !,
1440		EndLine=StartLine, EndCol=StartCol.
1441		extract_line_col(span_context(Span,_),StartLine,StartCol,EndLine,EndCol) :- !,
1442		extract_line_col(Span,StartLine,StartCol,EndLine,EndCol).
1443		extract_line_col(Pos,_,_,_,_) :- is_symbolic_position(Pos),!,fail. % cannot extract line/col infos
1444		%extract_line_col(Struct,StartLine,StartCol,EndLine,EndCol) :-
1445		% is_argument_of_compound_term(Struct,Arg),
1446		% functor(Arg,FF,NN),functor(Struct,FS,NS), write(detected(FF,NN,in,FS,NS)),nl,trace,
1447		% /* recursively look for error spans inside */
1448		% extract_line_col(Arg,StartLine,StartCol,EndLine,EndCol),!.
1449		%extract_line_col(S,_,_,_,_) :- print('COULD NOT EXTRACT LINE/COL INFO: '), print(S),
1450		% functor(S,F,N), print(' '),print(F/N),nl,nl,fail.
1451
1452		%:- use_module(library(between),[between/3]).
1453		%is_argument_of_compound_term(Term,Arg) :- functor(Term,_,Arity),
1454		% between(1,Arity,ArgNr), arg(ArgNr,Term,Arg),
1455		% % this is quite dangerous, and possibly expensive
1456		% ground(Arg).
1457
1458		is_symbolic_position(rodinpos(_,_)).
1459		is_symbolic_position(rodinpos(_,_,_)).
1460		is_symbolic_position(rodin_derived_context_pos(_,_,_)).
1461		is_symbolic_position(label(_)).
1462
1463
1464		/* For TCL TK: extract all line_col information in one go and in 4 lists */
1465		extract_all_line_col(Span, StartLineList,StartColList,EndLineList,EndColList) :-
1466		findall(lc(SL,SC,EL,EC), extract_line_col(Span,SL,SC,EL,EC),All),
1467		%print(all(All,Span)),nl,
1468		split_lc(All,StartLineList,StartColList,EndLineList,EndColList).
1469
1470		split_lc([], [],[],[],[]).
1471		split_lc([lc(SL,SC,EL,EC)|T],[SL|T1],[SC|T2],[EL|T3],[EC|T4]) :-
1472		split_lc(T,T1,T2,T3,T4).
1473
1474		% TO DO: merge with line_col and in Tcl/Tk use info to highlight proper file !
1475
1476
1477		% TODO: maybe add a preference to always get full filename path (cf always_print_filename in translate)
1478		% TODO: do not show filename if there is only one file ?
1479		extract_relative_file_name(Pos,RelFilename) :-
1480		extract_file_name(Pos,Filename),
1481		(specfile:currently_opened_file_status(Main,_),
1482		tools:get_parent_directory(Main,MainDir),
1483		tools:gen_relative_path(Filename,MainDir,Rel)
1484		-> RelFilename = Rel
1485		; RelFilename = Filename).
1486		extract_file_name(Pos,Filename) :-
1487		extract_valid_file_number_and_name(Pos,_,Filename),
1488		Filename \=null. % Filename = null occurs in eval_strings !?
1489		extract_tail_file_name(Pos,Filename) :-
1490		extract_valid_file_number_and_name(Pos,_,FullFilename),
1491		tools:get_tail_filename(FullFilename,Filename).
1492		extract_subsidiary_tail_file_name(Pos,Filename) :-
1493		extract_valid_file_number_and_name(Pos,Nr,FullFilename),
1494		not_main_file(Nr,FullFilename),
1495		tools:get_tail_filename(FullFilename,Filename).
1496
1497		extract_valid_file_number_and_name(Pos,Nr,Filename) :-
1498		extract_file_number_and_name(Pos,Nr,Filename),
1499		valid_filename(Filename).
1500		valid_filename(F) :- atom(F). % not unknown(-1) which can come from REPL
1501		% should we detect null here?
1502
1503		% a version of extract_line_col which fails if the primary error location is not in the main file
1504		extract_primary_line_col_for_main_file(Span,Line,Col,EndLine,EndCol) :-
1505		\+((extract_file_number_and_name(Span,Nr,FullFilename),
1506		not_main_file(Nr,FullFilename))),
1507		extract_line_col(Span,Line,Col,EndLine,EndCol).
1508
1509		% a version of extract_line_col which fails if the error or subsidiary location is not in the main file
1510		extract_line_col_for_main_file(Span,Line,Col,EndLine,EndCol) :-
1511		(extract_file_number_and_name(Span,Nr,FullFilename),
1512		not_main_file(Nr,FullFilename)
1513		-> extract_additional_pos_and_descr(Span,SubPos,_),
1514		extract_line_col_for_main_file(SubPos,Line,Col,EndLine,EndCol)
1515		; extract_line_col(Span,Line,Col,EndLine,EndCol)
1516		).
1517
1518		extract_file_number_and_name(V,_,_) :- var(V),!,fail.
1519		extract_file_number_and_name(value(_),_,_) :- !,fail.
1520		extract_file_number_and_name(pos_context(A,_,_), Filenumber,Filename) :- !,
1521		extract_file_number_and_name(A, Filenumber,Filename).
1522		extract_file_number_and_name(span_predicate(P,_,_), Filenumber,Filename) :- !,
1523		extract_file_number_and_name(P, Filenumber,Filename).
1524		extract_file_number_and_name(Pos, ResFileNr,Res) :-
1525		get_position_filenumber(Pos,Filenumber),!,
1526		(get_filename(Filenumber,Filename)
1527		-> ResFileNr=Filenumber,Res=Filename
1528		; ResFileNr=Filenumber,Res=unknown(Filenumber) % unknown(-1) which can come from REPL
1529		).
1530		extract_file_number_and_name(src_span(_,Filename,_,_,_,_,_,_), ResFileNr, Res) :- !,ResFileNr=unknown, Res=Filename.
1531		extract_file_number_and_name(src_span(_,_,_, _,_,_), _ResFileNr, _Res) :- !,fail. % src_span/6, No file stored
1532		extract_file_number_and_name(src_position_with_filename(_,_,_,Filename), ResFileNr, Res) :- !,ResFileNr=unknown,Res=Filename.
1533		extract_file_number_and_name(src_position_with_filename_and_ec(_,_,_,_,Filename), ResFileNr, Res) :- !,ResFileNr=unknown,Res=Filename.
1534		extract_file_number_and_name(section(RodinFilename), ResFileNr, Res) :- !,ResFileNr=unknown,Res=RodinFilename.
1535		extract_file_number_and_name([H|T],Filenumber,Filename) :- !,
1536		posinfo_member(Arg,[H|T]),
1537		extract_file_number_and_name(Arg,Filenumber,Filename),!.
1538		extract_file_number_and_name(closure(_,_,B),Filenumber,Filename) :- !,
1539		extract_file_number_and_name(B,Filenumber,Filename).
1540		extract_file_number_and_name(b(E,_,Infos),Filenumber,Filename) :- !,
1541		(extract_file_number_and_name(Infos,Filenumber,Filename) -> true
1542		; first_sub_expr(E,A) -> extract_file_number_and_name(A,Filenumber,Filename)).
1543		extract_file_number_and_name(span_context(Span,_),Filenumber,Filename) :- !,
1544		extract_file_number_and_name(Span,Filenumber,Filename).
1545		%extract_file_number_and_name(Struct,Filenumber,Filename) :-
1546		% /* recursively look for error spans inside */
1547		% is_argument_of_compound_term(Struct,Arg),
1548		% extract_file_number_and_name(Arg,Filenumber,Filename),!.
1549
1550	?	definite_posinfo_member(POS,Args) :- member(nodeid(POS),Args).
1551		posinfo_member(Arg,Args) :- % look for a nodeid(.) member
1552	?	(member(nodeid(POS),Args) -> Arg=POS). % no longer allow other members in lists ; member(Arg,Args)).
1553
1554		%:- use_module(bmachine,[b_get_all_used_filenames/1,b_get_main_filenumber/1]).
1555		position_is_not_in_main_file(Pos) :-
1556		get_position_filenumber(Pos,Filenumber),!, % B position info
1557		not_main_filenumber(Filenumber).
1558		position_is_not_in_main_file(src_span(_,Filename,_,_,_,_,_,_)) :- !,
1559		specfile:currently_opened_file_status(Main,_), Main \= Filename.
1560		position_is_not_in_main_file(src_position_with_filename(_,_,_,Filename)) :- !,
1561		specfile:currently_opened_file_status(Main,_), Main \= Filename.
1562		position_is_not_in_main_file(src_position_with_filename_ec(_,_,_,_,Filename)) :- !,
1563		specfile:currently_opened_file_status(Main,_), Main \= Filename.
1564		position_is_not_in_main_file(Struct) :- \+ atomic(Struct), Struct =.. [_|Args],
1565		/* recursively look for error spans inside */
1566	?	member(Arg,Args), position_is_not_in_main_file(Arg),!.
1567
1568
1569		not_main_file(Filenumber,_) :- number(Filenumber),!, % B Position info
1570		not_main_filenumber(Filenumber).
1571		not_main_file(_,Filename) :- % probably CSP position info; or unknown
1572		specfile:currently_opened_file_status(Main,_),
1573		\+ same_file_name(Main,Filename). %Main \= Filename.
1574
1575		:- use_module(tools,[get_tail_filename/2]).
1576		same_file_name(F1,F2) :-
1577		(F1=F2 -> true
1578		; atom(F1), atom(F2), % we can have a non-atomic name like package(event_b_project)
1579		get_tail_filename(F1,T1),
1580		get_tail_filename(F2,T2), T1=T2).
1581
1582		not_main_filenumber(Filenumber) :-
1583		(bmachine:b_get_main_filenumber(MainFN) -> MainFN \= Filenumber
1584		; true). % there is no main file number, this must be an additionally loaded file (e.g., VisB .def file)
1585
1586		% ---------------------------------
1587
1588
1589
1590		% find a sub-position matching a given target like context_pos
1591		find_sub_position_match(Pos,Target) :- Target=Pos,!.
1592		find_sub_position_match(b(E,_,Infos),Target) :- !,
1593		(find_sub_position_match(Infos,Target) -> true
1594		; first_sub_expr(E,A),find_sub_position_match(A,Target)).
1595		find_sub_position_match(span_predicate(P,_,_),Target) :- !,
1596		find_sub_position_match(P,Target).
1597		find_sub_position_match([H|T],Target) :- !,
1598		posinfo_member(N,[H|T]),
1599		find_sub_position_match(N,Target).
1600		find_sub_position_match(closure(_,_,B),Target) :- !,
1601		find_sub_position_match(B,Target).
1602
1603		extract_pos_context(Span,MainPos,Context,CtxtPos) :-
1604		find_sub_position_match(Span,pos_context(M,C,P)),!,
1605		MainPos=M, Context=C, CtxtPos=P.
1606
1607		% extract additional information about error span, e.g., Definition call context, other spans,...
1608		extract_additional_description(Span,FullDesc) :-
1609	?	extract_additional_pos_and_descr(Span,_Position,FullDesc).
1610
1611		extract_additional_pos_and_descr(Span,CtxtPos,FullDesc) :-
1612		extract_pos_context(Span,MainPos,Context,CtxtPos),
1613		%nl,print(pos_context(MainPos,Context,CtxtPos)),nl,
1614	?	extract_context_msg(Context,MainPos,CMsg),
1615		(extract_span_description(CtxtPos,PosMsg)
1616		-> ajoin([CMsg,' at ',PosMsg],FullDesc)
1617		; FullDesc=CMsg). % no position info available
1618
1619		extract_context_msg(call_stack(Stack),MainPos,Msg) :- !,
1620	?	translate:translate_call_stack([top_level_call(MainPos)|Stack],Msg). % dynamic call stack; we add subsidiary DEFINITION calls to the Call stack
1621		% see result e.g., for public_examples/B/FeatureChecks/DEFINITIONS/DefCallStackDisplay.mch
1622		% TODO: should we also add_inner_context_description for use-cases like Atom editor
1623		extract_context_msg(definition_call(Name),MainPos,Msg) :- !, % static Definition macro expansion call stack
1624		ajoin(['DEFINITION call of ',Name],OuterMsg),
1625		add_inner_context_description(MainPos,OuterMsg,Msg).
1626		extract_context_msg(C,MainPos,Msg) :- ajoin(['CONTEXT: ',C],OuterMsg),
1627		add_inner_context_description(MainPos,OuterMsg,Msg).
1628
1629
1630		add_inner_context_description(Span,OuterCMsg,FullDesc) :-
1631		% used to have this check: Span = pos_context(MainPos,Context,CtxtPos),
1632		extract_additional_pos_and_descr(Span,_Pos,InnerCMsg),!,
1633		ajoin([InnerCMsg,' within ',OuterCMsg],FullDesc).
1634		add_inner_context_description(_,FullDesc,FullDesc).
1635
1636		% try and extract a definition call stack
1637		extract_definition_call_stack(pos_context(_Main,definition_call(Name),AuxPos),[Name|T]) :- !,
1638		extract_definition_call_stack(AuxPos,T).
1639		extract_definition_call_stack(_,[]).
1640
1641
1642		% ---------------------------------
1643
1644		% Get Source Position Info string for use in Tcl/Tk tables (column must be called 'Source'):
1645		get_tk_table_position_info(Span,PosStr) :-
1646		extract_line_col_for_main_file(Span,StartRow,StartCol,EndRow,EndCol), !,
1647		ajoin([' at line ',StartRow,':',StartCol,' - ', EndRow, ':', EndCol],PosStr). % recognised by Tk Table viewer
1648		get_tk_table_position_info(Span,PosStr) :- extract_span_description(Span,PosStr),!.
1649		get_tk_table_position_info(_,'').
1650
1651
1652		% ---------------------------------
1653
1654		:- dynamic backed_up_error/4.
1655
1656		% copy current error facts into backed_up_error facts
1657		backup_errors :-
1658		retractall(backed_up_error(_,_,_,_)),
1659		logged_error(Source,S,TContext,Span),
1660		assertz(backed_up_error(Source,S,TContext,Span)),
1661		fail.
1662		backup_errors.
1663
1664		% ---------------------------------
1665
1666		:- dynamic error_manager_silent_mode/1.
1667		% separate from debug:silent_mode to avoid dependency to debug module
1668		error_manager_silent_mode(off).
1669
1670		set_error_manager_silent_mode(X) :- retractall(error_manager_silent_mode(_)),
1671		assertz(error_manager_silent_mode(X)).
1672
1673
1674		formatsilentmsg(Stream,FS,Args) :- error_manager_silent_mode(off) -> format(Stream,FS,Args) ; true.
1675
1676		% -------------------------------------------
1677
1678		:- use_module(eventhandling,[register_event_listener/3]).
1679		:- register_event_listener(reset_prob,reset_errors,
1680		'Reset Error Manager just like after starup_prob (except total_number_of_errors)').