1		% Heinrich Heine Universitaet Duesseldorf
2		% (c) 2021-2025 Lehrstuhl fuer Softwaretechnik und Programmiersprachen,
3		% This software is licenced under EPL 1.0 (http://www.eclipse.org/org/documents/epl-v10.html)
4
5		:- module(visb_visualiser,[load_visb_file/1,
6		load_visb_definitions_from_list_of_facts/2,
7		load_visb_definitions_from_term/2,
8		load_visb_file_if_necessary/1,
9		visb_file_is_loaded/1, visb_file_is_loaded/3,
10		visb_current_state_can_be_visualised/0,
11		get_default_visb_file/2, extended_static_check_default_visb_file/0,
12		load_default_visb_file_if_necessary/0,
13		generate_visb_html_for_history/1, generate_visb_html_for_history/2,
14		generate_visb_html_for_history_with_vars/1,
15		generate_visb_html_for_history_with_source/1,
16		generate_visb_html_for_current_state/1, generate_visb_html_for_current_state/2,
17		generate_visb_html_codes_for_states/3,
18		generate_visb_html/3,
19		tcltk_get_visb_items/1, tcltk_get_visb_events/1,
20		tcltk_get_visb_objects/1, tcltk_get_visb_hovers/1,
21		get_visb_items/1, get_visb_attributes_for_state/2,
22		get_visb_click_events/1, get_visb_hovers/1,
23		perform_visb_click_event/4,
24		tcltk_perform_visb_click_event/1,
25		get_visb_default_svg_file_contents/1,
26		get_visb_svg_objects/1]).
27
28		:- use_module(probsrc(module_information),[module_info/2]).
29		:- module_info(group,visualization).
30		:- module_info(description,'This module provides VisB visualisation functionality.').
31
32		% special SVG object attributes treated by VisB
33		% title (creates hover tooltip; currently only works with objects created by VisB itself)
34		% id
35		% svg_class
36		% text
37		% hovers
38		% event, events
39		% predicate
40
41		:- meta_predicate process_repeat(-,-,-,2).
42
43		:- use_module(extrasrc(json_parser),[json_parse_file/3]).
44		:- use_module(library(lists)).
45
46		:- use_module(probsrc(error_manager)).
47		:- use_module(probsrc(preferences),[get_preference/2]).
48		:- use_module(probsrc(debug)).
49		:- use_module(probsrc(state_space), [visited_expression/2, visited_state_corresponds_to_initialised_b_machine/1,
50		get_constants_id_for_state_id/2, get_constants_state_id_for_id/2,
51		set_context_state/2, clear_context_state/0,
52		transition/3, transition/4, invariant_violated/1, invariant_not_yet_checked/1,
53		multiple_concrete_constants_exist/0, is_concrete_constants_state_id/1]).
54		:- use_module(probsrc(translate), [translate_bvalue_to_codes/2, translate_bvalue_to_codes_with_limit/3,
55		translate_bvalue_with_limit/3]).
56		:- use_module(probsrc(specfile),[eventb_mode/0, xtl_mode/0,
57		state_corresponds_to_initialised_b_machine/2,
58		state_corresponds_to_fully_setup_b_machine/2,
59		state_corresponds_to_set_up_constants_only/2,
60		expand_to_constants_and_variables/3,
61		extract_variables_from_state/2]).
62
63		:- use_module(probsrc(tools),[start_ms_timer/1,stop_ms_walltimer_with_msg/2, ajoin_with_sep/3]).
64		:- use_module(probsrc(tools_io),[safe_open_file/4, with_open_stream_to_codes/4]).
65		:- use_module(probsrc(bmachine), [b_machine_name/1, b_get_definition_name_with_pos/4, bmachine_is_precompiled/0,
66		pre_expand_typing_scope/2, determine_type_of_formula/2, determine_type_of_formula/3]).
67		:- use_module(probsrc(bsyntaxtree), [get_texpr_ids/2]).
68		:- use_module(probsrc(tools_lists),[include_maplist/3]).
69		:- use_module(probsrc(tools),[split_list/4, html_escape_codes/2]).
70		:- use_module(probsrc(tools_matching),[get_all_svg_attributes/1, is_svg_attribute/1, is_virtual_svg_attribute/1,
71		is_svg_number_attribute/2, is_svg_color_attribute/1]).
72
73		% --------------------------
74
75		% facts storing loaded JSON VisB file:
76		:- dynamic visb_file_loaded/3, visb_svg_file/5, visb_empty_svg_box_height_width/3,
77		visb_definition/6, visb_special_definition/6,
78		visb_item/7,
79		visb_event/6, visb_hover/6, visb_has_hovers/1, visb_has_visibility_hover/1,
80		visb_event_enable_list/5,
81		visb_svg_object/5, visb_svg_object_debug_info/2,
82		visb_svg_child/2, visb_svg_parent/2.
83		:- dynamic auxiliary_visb_event/5.
84		% visb_svg_file(SVGFile, AbsolutePathSVGFile, JSONFileFromWhichWeImportSVG,PosTerm,ModLocTime)
85		% visb_item(SVGID,Attribute,TypedExpression,UsedIds,Description/Comment,StartPos,OtherMetaInfos)
86		% visb_event(SVGID,Event,PredicateList,TypedPredicate,File,Pos)
87		% visb_svg_object(SVGID,SVG_Class,AttrList,Description/Comment,Pos) ; AttrList contains svg_attribute(Attr,Val)
88
89		reset_visb :- debug_println(9,resetting_visb),
90		retractall(visb_file_loaded(_,_,_)),
91		retractall(visb_empty_svg_box_height_width(_,_,_)),
92		retractall(visb_svg_file(_,_,_,_,_)),
93		retractall(visb_definition(_,_,_,_,_,_)),
94		retractall(visb_special_definition(_,_,_,_,_,_)),
95		retractall(visb_item(_,_,_,_,_,_,_)),
96		retractall(visb_event(_,_,_,_,_,_)),
97		retractall(visb_hover(_,_,_,_,_,_)),
98		retractall(visb_has_hovers(_)),
99		retractall(visb_has_visibility_hover(_)),
100		retractall(visb_event_enable_list(_,_,_,_,_)),
101		retractall(auxiliary_visb_event(_,_,_,_,_)),
102		retractall(visb_svg_object(_,_,_,_,_)),
103		retractall(visb_svg_object_debug_info(_,_)),
104		retractall(visb_svg_child(_,_)),
105		retractall(visb_svg_parent(_,_)),
106		reset_auto_attrs.
107
108		visb_file_is_loaded(JSONFile) :-
109		visb_file_is_loaded(JSONFile,_,true).
110		visb_file_is_loaded(JSONFile,SVGFile,AllowEmpty) :-
111		visb_file_loaded(JSONFile,_,_),
112		(visb_svg_file(_,SVGFile,_,_,_) -> true
113		; visb_empty_svg_box_height_width(_,_,_) -> SVGFile = ''
114		; user_has_defined_visb_objects -> SVGFile = ''
115		; JSONFile='' ->
116		AllowEmpty=true,
117		add_warning(visb_visualiser,'No VISB_SVG_FILE or VISB_SVG_OBJECTS specified in DEFINITIONS',''),
118		% Note: warning also generated below No VisB JSON file is specified and no VISB_SVG_OBJECTS were created
119		SVGFile = ''
120		; add_warning(visb_visualiser,'No SVG file or objects specified for VisB file:',JSONFile),
121		AllowEmpty=true,
122		SVGFile = ''
123		).
124
125		no_svg_available :-
126		\+ user_has_defined_visb_objects,
127		no_svg_file_available,
128		\+ visb_empty_svg_box_height_width(_,_,_). % no SVG box provided
129
130		no_svg_file_available :- (visb_svg_file(_,SVGFile,_,_,_) -> SVGFile='' ; true).
131
132		:- use_module(probsrc(state_space),[current_state_id/1,
133		current_state_corresponds_to_setup_constants_b_machine/0]).
134		visb_current_state_can_be_visualised :-
135		%visb_file_is_loaded(_), % no longer checked; Tcl/Tk will automatically load VisB file if required
136		(b_or_z_mode -> current_state_corresponds_to_setup_constants_b_machine
137		; \+ current_state_id(root)
138		).
139
140		:- use_module(probsrc(eventhandling),[register_event_listener/3]).
141		:- register_event_listener(reset_specification,reset_visb,'Reset VisB information').
142		:- register_event_listener(reset_prob,reset_visb,'Reset VisB information').
143
144		%static_check_visb :- % now done when adding items and not storing multiple items
145		% visb_item(ID,Attr,F1,_,_,Pos1), visb_item(ID,Attr,F2,_,Pos2), F1 @< F2,
146		% add_warning(visb_visualiser,'Multiple formulas for SVG identifier and attribute:',ID/Attr,Pos1),
147		% add_message(visb_visualiser,'Location of second formula for:',ID/Attr,Pos2),
148		% fail.
149		% TO DO: some sanity checks on attributes and values
150		static_check_visb :-
151		no_svg_file_available,
152		visb_hover(SVGID,_ID,Attr,_Enter,_Exit,Pos),
153		\+ svg_id_exists(SVGID),
154		ajoin(['Hover for attribute ',Attr,' has unknown trigger-id (can lead to blank visualisation): '],Msg),
155		add_warning(visb_visualiser,Msg,SVGID,Pos),
156		fail.
157		static_check_visb :-
158		no_svg_file_available,
159		visb_hover(SVGID,ID,Attr,_Enter,_Exit,Pos), ID \= SVGID,
160		\+ svg_id_exists(ID),
161		ajoin(['Hover for attribute ',Attr,' has unknown id (can lead to blank visualisation): '],Msg),
162		add_warning(visb_visualiser,Msg,ID,Pos),
163		fail.
164		static_check_visb :-
165		visb_svg_file(SvgFile,_,_,Pos,_),
166		SvgFile \= '',
167		visb_empty_svg_box_height_width(H,W,ViewBox),
168		ajoin(['VISB_SVG_BOX (width=', W, ', height=', H, ', viewBox=', ViewBox,
169		') cannot be applied to an existing SVG file (use VISB_SVG_CONTENTS for file or put info into SVG file): '],Msg),
170		add_warning(visb_visualiser,Msg,SvgFile,Pos),
171		fail.
172		static_check_visb.
173
174		svg_id_exists(SVGID) :- visb_svg_object(SVGID,_,_StaticAttrList,_,_ExitPos).
175		% --------------------------
176
177		:- use_module(probsrc(tools),[read_string_from_file/2]).
178
179		% store templates as facts, so that compiled version of probcli does not need to find files
180		:- dynamic visb_template_file_codes/2.
181
182		assert_from_template(Filename) :- %formatsilent('Loading ~w~n',[Filename]),
183		absolute_file_name(visbsrc(Filename), Absolute, []),
184		read_string_from_file(Absolute,String),
185		assertz(visb_template_file_codes(Filename,String)).
186
187		:- assert_from_template('visb_template_header.html').
188		:- assert_from_template('visb_template_svg_downloads.html').
189		:- assert_from_template('visb_template_replayTrace.html').
190		:- assert_from_template('visb_template_middle.html').
191		:- assert_from_template('visb_template_footer.html').
192
193		write_visb_template(HtmlFile,Stream) :-
194		visb_template_file_codes(HtmlFile,Codes),
195		format(Stream,'~s~n',[Codes]).
196
197
198		% --------------------------
199
200		:- use_module(probsrc(pref_definitions),[b_get_definition_string_from_spec/3]).
201		get_default_visb_file(Path, Pos) :- get_default_visb_file(Path, _, Pos).
202		get_default_visb_file(Path, Kind, Pos) :- bmachine_is_precompiled,
203		(b_get_definition_string_from_spec('VISB_JSON_FILE', Pos, Path)
204		-> Kind=json % user provided explicit path to VISB JSON file
205		; b_get_definition_string_from_spec('VISB_DEFINITIONS_FILE', Pos, Path)
206		-> Kind=def % user provided explicit path to VISB DEFINITIONS file
207		% TODO: in future check that file extension is compatible
208		% advantage of VISB_DEFINITIONS_FILE == "File" over "File"
209		% 1) visualisation can be re-loaded without re-loading machine
210		% 2) can be used in TLA+ or similar
211		% 3) avoid clash if definitions file itself defines empty VISB_JSON_FILE
212		% 4) avoid problems with Atelier-B or other tools
213		; get_default_visb_svg_file(_,Pos)
214		-> Kind=empty, Path='' % user provided SVG file path
215		; user_has_defined_visb_objects_in_defs
216		-> Kind=empty, Path='' % user provided SVG object definitions
217		).
218
219		user_has_defined_visb_objects :-
220		(visb_svg_object(_,_,_,_,_) -> true % created in JSON file
221		; user_has_defined_visb_objects_in_defs).
222
223		user_has_defined_visb_objects_in_defs :-
224		b_sorted_b_definition_prefixed(expression,'VISB_SVG_OBJECTS',_,_).
225
226		% you should do b_absolute_file_name_relative_to_main_machine
227		get_default_visb_svg_file(Path, Pos) :-
228		b_get_definition_string_from_spec('VISB_SVG_FILE', Pos, Path).
229
230
231		% load default VISB_JSON_FILE if it is specified and not already loaded
232		load_default_visb_file_if_necessary :-
233		get_default_visb_file(File, Pos),!,
234		(load_visb_file_if_necessary(File) -> true
235		; add_error(visb_visualiser,'Could not load VISB_JSON_FILE:',File,Pos)).
236		load_default_visb_file_if_necessary :-
237		(eventb_mode -> true ; add_message(visb_visualiser,'No VISB_JSON_FILE DEFINITION provided')).
238
239		% --------------------------
240		% Loading a JSON VisB file:
241
242
243		:- use_module(probsrc(tools), [get_filename_extension/2]).
244		:- use_module(probsrc(bmachine), [
245		b_load_additional_definitions_file/1,
246		b_load_additional_definitions_from_list_of_facts/1,
247		b_load_additional_definitions_from_term/1
248		]).
249		load_visb_file(File) :-
250		temporary_set_preference(allow_arith_operators_on_reals,true,Old),
251		call_cleanup((load_visb_file1(File)),
252		reset_temporary_preference(allow_arith_operators_on_reals,Old)).
253		load_visb_file1(File) :-
254		get_filename_extension(File,def), % a .def B definition file
255		!,
256		add_message(visb_visualiser,'Loading VisB DEFINITIONS from B file: ',File),
257		b_load_additional_definitions_file(File),
258		load_visb_file2('',File).
259		load_visb_file1(File) :- load_visb_file2(File,File).
260
261		load_visb_definitions_from_list_of_facts(DefFilePath, ListOfFacts) :-
262		temporary_set_preference(allow_arith_operators_on_reals,true,Old),
263		call_cleanup(
264		(b_load_additional_definitions_from_list_of_facts(ListOfFacts),
265		load_visb_file2('', DefFilePath)),
266		reset_temporary_preference(allow_arith_operators_on_reals,Old)).
267
268		load_visb_definitions_from_term(DefFilePath, Machine) :-
269		temporary_set_preference(allow_arith_operators_on_reals,true,Old),
270		call_cleanup(
271		(b_load_additional_definitions_from_term(Machine),
272		load_visb_file2('', DefFilePath)),
273		reset_temporary_preference(allow_arith_operators_on_reals,Old)).
274
275		load_visb_file2(File,OrigFileName) :-
276		reset_visb,
277		load_visb_from_definitions(no_inlining), % TODO: pass InlineObjects?
278		start_ms_timer(T),
279		(File='' % No JSON file
280		-> (get_default_visb_svg_file(SvgFile,DefaultSVGPos)
281		-> (SvgFile='' -> AbsFile=SvgFile % just dummy empty string provided by user
282		; b_absolute_file_name_relative_to_main_machine(SvgFile,AbsFile)
283		),
284		add_visb_svg_file(SvgFile,AbsFile,'',DefaultSVGPos)
285		; check_objects_created(File) % no JSON and SVG file; check we have created objects
286		)
287		; add_visb_file(File,[]),
288		stop_ms_walltimer_with_msg(T,'loading VisB file: ')
289		),
290		static_check_visb,
291		(OrigFileName = ''
292		-> ModTime=0, ModLocTime=0 % We could get modification time of files with VISB_SVG_OBJECTS, ... DEFINITIONS
293		; file_property(OrigFileName, modify_timestamp, ModTime),
294		file_property(OrigFileName, modify_localtime, ModLocTime)
295		),
296		assertz(visb_file_loaded(OrigFileName,ModTime,ModLocTime)).
297
298		check_objects_created(File) :-
299		(visb_svg_object(_,_,_,_,_) -> true
300		; add_warning(visb_visualiser,'No VisB JSON file is specified and no VISB_SVG_OBJECTS were created:',File)
301		).
302
303		load_visb_from_definitions(InlineObjects) :-
304		start_ms_timer(T),
305		pre_expand_typing_scope([variables_and_additional_defs],ExpandedScope), % do this only once for all defs
306		get_svg_objects_from_definitions(InlineObjects,ExpandedScope),
307		(get_SVG_BOX_definition(InlineObjects) -> true ; true), % TODO: also pass scope
308		stop_ms_walltimer_with_msg(T,'extracting VisB infos from DEFINITIONS: ').
309
310		:- use_module(library(file_systems),[file_exists/1, file_property/3]).
311		%:- use_module(library(system),[now/1, datime/2]).
312		load_visb_file_if_necessary(File) :-
313		visb_file_loaded(File,ModTime1,_), % this file is already loaded
314		(File = '' -> true
315		; file_exists(File),
316		file_property(File, modify_timestamp, ModTime2), % check if it has the same time stamp
317		debug_println(19,visb_json_already_loaded(File,ModTime1,ModTime2)),
318		ModTime1=ModTime2
319		),
320		!.
321		load_visb_file_if_necessary(File) :- load_visb_file(File).
322
323
324		:- use_module(probsrc(bmachine),[set_additional_filename_as_parsing_default/3, reset_filename_parsing_default/2]).
325
326		add_visb_file(File,LoadedFiles) :- member(File,LoadedFiles),!,
327		add_error(visb_visualiser,'Circular inclusion of JSON files:',[File|LoadedFiles]).
328		add_visb_file(File,_) :- \+ file_exists(File),!,
329		add_error(visb_visualiser,'JSON file does not exist:',File), fail.
330		add_visb_file(File,LoadedFiles) :-
331		debug_format(19,'Loading JSON File: ~w~n',[File]),
332		set_additional_filename_as_parsing_default(File,NewNr,OldNr),
333		call_cleanup(add_visb_file2(File,LoadedFiles), reset_filename_parsing_default(NewNr,OldNr)).
334
335		add_visb_file2(File,LoadedFiles) :-
336		json_parse_file(File,json(List2),[position_infos(true),multiline_strings(true)]),
337		% tools_printing:trace_print(List2),nl,nl,
338		process_json(List2,File),
339		!,
340		(get_attr_with_pos(include,List2,JsonFileTerm,File,Pos)
341		-> check_json_string(JsonFileTerm,include,Pos,JsonFile),
342		absolute_file_name(JsonFile,AF,[relative_to(File)]),
343		formatsilent('Including JSON file: ~w~n',[JsonFile]),
344		add_visb_file(AF,[File|LoadedFiles])
345		; true
346		),
347		(LoadedFiles=[], % only check for main included file
348		get_attr_with_pos('model-name',List2,string(ModelName),File,MPos),
349		b_machine_name(Main), Main \= ModelName
350		-> ajoin(['VisB JSON file expects model-name ',ModelName,' instead of: '],MMsg),
351		add_warning(visb_visualiser,MMsg,Main,MPos)
352		; true
353		).
354		add_visb_file2(File,_) :-
355		add_error(visb_visualiser,'Unable to process JSON file:',File),
356		fail.
357
358		% process json content of a VisB file:
359		process_json(List,JSONFile) :- visb_svg_file(_,_,_,_,_),!, % we have already determined the SVG file
360		process_json2(List,JSONFile).
361		process_json(List,JSONFile) :-
362		get_attr_with_pos(svg_box,List,json(BoxList),JSONFile,Pos),
363		% json([=(width,400,3-3),=(height,400,3-3)])
364		(get_attr(svg,List,string(SvgFile)) -> SvgFile='' ; true), % check if svg attr empty or non-existant
365		force_get_attr_nr(height,BoxList,H,JSONFile),
366		force_get_attr_nr(width,BoxList,W,JSONFile),!,
367		(get_attr(viewBox,BoxList,string(VB)) -> ViewBox=VB ; ViewBox=''),
368		add_message(visb_visualiser,'Will create empty SVG image with specified dimensions: ',H:W,Pos),
369		assert_visb_empty_svg_box_height_width(H,W,ViewBox,Pos),
370		process_json2(List,JSONFile).
371		process_json(List,JSONFile) :-
372		get_attr_with_pos(svg,List,FileTerm,JSONFile,Pos),
373		check_json_string(FileTerm,svg,Pos,File),
374		(File = '' -> get_default_visb_svg_file(SvgFile, _)
375		; get_default_visb_svg_file(SvgFile, DPos)
376		-> add_message(visb_visualiser,'Overriding svg file specified in JSON file: ',File,DPos)
377		; SvgFile=File),
378		!,
379		absolute_file_name(SvgFile,AbsFile,[relative_to(JSONFile)]),
380		add_visb_svg_file(SvgFile,AbsFile,JSONFile,Pos),
381		process_json2(List,JSONFile).
382		process_json(List,JSONFile) :-
383		get_default_visb_svg_file(SvgFile, Pos), SvgFile \= '',
384		!,
385		absolute_file_name(SvgFile,AbsFile,[]), % relative to B machine??
386		add_visb_svg_file(SvgFile,AbsFile,JSONFile,Pos),
387		process_json2(List,JSONFile).
388		process_json(List,JSONFile) :-
389		process_json2(List,JSONFile),
390		(get_SVG_BOX_definition(no_inlining) -> true % TODO: pass (InlineObjects)
391		; get_attr_with_pos(svg,List,_,JSONFile,Pos) -> % File is empty
392		add_message(visb_visualiser,'Creating empty SVG image. You can add a declaration like "svg_box": {"width":W,"height":H} to specify dimensions in: ',JSONFile,Pos)
393		; add_warning(visb_visualiser,'Creating empty SVG image. The JSON file contains no svg attribute (pointing to the SVG file): ',JSONFile)
394		).
395
396		add_visb_svg_file(SvgFile,AbsFile,JSONFile,Pos) :-
397		(SvgFile='' -> add_message(visb_visualiser,'Empty VisB SVG file:',SvgFile,Pos)
398		; file_exists(AbsFile)
399		-> debug_format(19,'SVG file = ~w (~w)~n',[SvgFile, AbsFile]),
400		file_property(AbsFile, modify_localtime, ModLocTime)
401		; add_error(visb_visualiser,'The specified VisB SVG file does not exist:',SvgFile,Pos),
402		ModLocTime=unknown
403		),
404		assertz(visb_svg_file(SvgFile,AbsFile,JSONFile,Pos,ModLocTime)).
405
406		process_json2(List,JSONFile) :-
407		process_json_definitions(List,JSONFile),
408		process_json_items(List,JSONFile),
409		process_json_events(List,JSONFile),
410		process_json_new_svg_objects(List,JSONFile).
411
412		:- use_module(probsrc(tools_strings),[ajoin/2]).
413		check_json_string(Term,_,_,Atom) :- Term = string(Atom), atom(Atom), !.
414		check_json_string(Term,Attr,Pos,_) :- !,
415		ajoin(['Illegal JSON attribute ',Attr,', expected a JSON string:'],Msg),
416		add_error(visb_visualiser,Msg,Term,Pos),fail.
417		% ----------------
418
419		% B definitions that can help write items, events more compactly
420		process_json_definitions(List,File) :-
421		get_attr(definitions,List,array(Defs)),!,
422		length(Defs,Len),
423		formatsilent('VisB Definitions: ~w~n',[Len]),
424		maplist(process_json_definition(File),Defs).
425		process_json_definitions(_,_File).
426
427		% VisB items which modify attributes of SVG objects
428		process_json_items(List,File) :-
429		get_attr(items,List,array(Items)),!,
430		length(Items,Len),
431		formatsilent('VisB Item declarations: ~w~n',[Len]),
432		maplist(process_visb_json_item(File),Items).
433		process_json_items(_,File) :- \+ visb_special_definition(visb_updates,_,_,_,_,_),!,
434		add_message(visb_visualiser,'The JSON file contains no items: ',File).
435		process_json_items(_,_).
436
437		% VisB events which react to clicks on SVG objects and display hovers
438		process_json_events(List,File) :-
439		get_attr(events,List,array(Items)),!,
440		length(Items,Len),
441		formatsilent('VisB Event declarations: ~w~n',[Len]),
442		maplist(process_json_event(File),Items).
443		process_json_events(_,_).
444
445		% VisB additional SVG objects added to SVG file
446		process_json_new_svg_objects(List,File) :-
447		get_attr(svg_objects,List,array(Items)),!,
448		length(Items,Len),
449		formatsilent('VisB additional svg_objects declarations: ~w~n',[Len]),
450		maplist(process_json_svg_object(File),Items).
451		process_json_new_svg_objects(List,File) :-
452		get_attr_with_pos(objects,List,array(Items),File,Pos),!,
453		add_warning(visb_visualiser,'Use "svg_objects" attribute instead of "objects" in: ',File,Pos),
454		maplist(process_json_svg_object(File),Items).
455		process_json_new_svg_objects(_,_).
456
457		:- use_module(probsrc(custom_explicit_sets),[try_expand_custom_set_with_catch/3,
458		is_custom_explicit_set/1, is_set_value/2]).
459		% evaluate all VISB_SVG_OBJECTS... DEFINITIONS and try and extract SVG objects
460		% this must be a set of records with at least id and svg_class field
461		get_svg_objects_from_definitions(InlineObjects,ExpandedScope) :-
462		find_and_eval_visb_DEFINITION('VISB_SVG_OBJECTS', SVG_ID, AttrList, Desc, DefName,
463		_DefPos, EvalPos, InlineObjects, allow_separation, ExpandedScope),
464		add_visb_object_from_definition(visb_objects, SVG_ID, AttrList, Desc, DefName, EvalPos),
465		%formatsilent('Generating new SVG object ~w with class ~w and attrs ~w~n',[SVG_ID,SVG_Class,AttrList2]),
466		fail.
467		get_svg_objects_from_definitions(InlineObjects,ExpandedScope) :-
468		find_and_eval_visb_DEFINITION('VISB_SVG_EVENTS', SVG_ID, AttrList, Desc, DefName,
469		_DefPos, EvalPos, InlineObjects, no_separation, ExpandedScope),
470		add_visb_object_from_definition(visb_events, SVG_ID, AttrList, Desc, DefName, EvalPos),
471		fail.
472		get_svg_objects_from_definitions(InlineObjects,ExpandedScope) :-
473		find_and_eval_visb_DEFINITION('VISB_SVG_HOVERS', SVG_ID, AttrList, Desc, DefName,
474		_DefPos, EvalPos, InlineObjects, no_separation, ExpandedScope),
475		add_visb_hovers_from_definition(SVG_ID, AttrList, Desc, DefName, EvalPos),
476		fail.
477		get_svg_objects_from_definitions(_InlineObjects,ExpandedScope) :- precompile_svg_object_updates(ExpandedScope).
478
479		% a hovers field can be something like:
480		% rec(.... hovers: (rec(class:"train-hover"),rec(trigger_id:"track_polyline",class:"train-hover")), ...)
481		add_visb_hovers_from_definition(SVG_ID,AttrList, Desc, DefName, DefPos) :-
482		select(svg_attribute(hovers,Hovers),AttrList,AttrList2),
483		!,
484		(AttrList2=[] -> true ; add_warning(visb_visualiser,'Unknown extra hover attributes:',AttrList2,DefPos)),
485		flex_member(Record,Hovers,DefName,DefPos),
486		(get_VISB_record_fields(Record,Fields) -> true
487		; add_warning(visb_visualiser,'VisB hovers field value is not a record of SVG attributes: ',Record,DefPos),fail),
488		include_maplist(extract_attribute_from_record(DefPos),Fields,HoverAttrList),
489		add_visb_object_from_definition(visb_hovers, SVG_ID, HoverAttrList, Desc, DefName, DefPos).
490
491		add_visb_hovers_from_definition(SVG_ID,AttrList, Desc, DefName, DefPos) :-
492		add_visb_object_from_definition(visb_hovers, SVG_ID, AttrList, Desc, DefName, DefPos).
493
494
495		% add a VisB record object from a HOVER or OBJECT definition:
496		add_visb_object_from_definition(visb_objects,SVG_ID, AttrList, Desc, DefName, DefPos) :- !,
497		(select(svg_attribute(svg_class,SVG_Class),AttrList,AttrList2)
498		-> true % maybe we should call svg_class svg_shape and
499		% allow html_tag for children of foreignObject
500		; add_warning(visb_visualiser,'SVG objects have no svg_class field:',DefName,DefPos),
501		fail
502		),
503		assert_visb_svg_object(SVG_ID,SVG_Class,AttrList2,Desc,DefName,DefPos).
504		add_visb_object_from_definition(visb_hovers,SVG_ID, AttrList, _Desc, _DefName, DefPos) :-
505		(select(svg_attribute(trigger_id,TriggerID),AttrList,AttrList2) -> true
506		; select(svg_attribute('trigger-id',TriggerID),AttrList,AttrList2) -> true
507		; TriggerID = SVG_ID, AttrList2=AttrList),
508		member(svg_attribute(Attr,EnterVal),AttrList2),
509		(visb_svg_object(SVG_ID,_,StaticAttrList,_,ExitPos)
510		-> (member(svg_attribute(Attr,ExitVal),StaticAttrList) -> true
511		; default_attribute_value(Attr,ExitVal)
512		-> add_message(visb_visualiser,'Assuming default hover exit value for attribute: ',Attr,DefPos)
513		; Attr = 'svg_class'
514		-> add_warning(visb_visualiser,
515		'svg_class cannot be set in hover for: ',SVG_ID,ExitPos),
516		ExitVal=EnterVal
517		; add_warning(visb_visualiser,
518		'No static (exit) value can be retrieved for hover for attribute: ',Attr,ExitPos),
519		ExitVal=EnterVal
520		)
521		; ajoin(['No VISB_SVG_OBJECT for id ',SVG_ID,', cannot retrieve hover exit value for attribute: '],Msg),
522		add_warning(visb_visualiser,Msg,Attr,DefPos),
523		fail %ExitVal=EnterVal
524		),
525		assert_visb_hover(TriggerID,SVG_ID,Attr,EnterVal,ExitVal,DefPos).
526		add_visb_object_from_definition(visb_events,SVG_ID, AttrList, _Desc, DefName, DefPos) :- !,
527		( select(svg_attribute(event,Event),AttrList,AttrList1) -> true
528		; select(svg_attribute(events,Events),AttrList,AttrList1) -> % we have events attributes with multiple events
529		flex_member(EvVal,Events,DefName,DefPos),
530		extract_attr_value(event,EvVal,Event,DefPos)
531		; AttrList = [_|_], % at least one other attribute than id; otherwise it may stem from separating VISB_SVG_OBJECTS
532		add_warning(visb_visualiser,'Missing event attribute in VisB definition: ',DefName,DefPos),
533		fail
534		),
535		(select(svg_attribute(predicate,Pred),AttrList1,_AttrList2) -> Preds=[Pred]
536		; member(P,[preds,predicates]),
537		select(svg_attribute(P,Pred),AttrList1,_AttrList2)
538		-> Preds=[Pred], add_warning(visb_visualiser,'Use predicate as attribute for VisB events instead of: ',P,DefPos)
539		; Preds=[] %, AttrList2=AttrList1
540		),
541		EnableItems=[],
542		% TODO extract from AttrList2: visb_enable_item(SvgID,Attr,EnabledValExpr,DisabledValExpr,PosAttr)
543		(error_manager:extract_file_number_and_name(DefPos,_,File) -> true ; File='?'),
544		PredPos = DefPos, %TODO: improve
545		add_visb_event(SVG_ID,Event,Preds,[],EnableItems,File,DefPos,PredPos,[]).
546
547		default_attribute_value(fill,black). % is remove for animate, ...
548		default_attribute_value(opacity,1).
549		default_attribute_value('stop-dasharray',none).
550		default_attribute_value('stop-opacity',1).
551		default_attribute_value('stroke-opacity',1).
552		default_attribute_value('stroke-width','1px').
553		default_attribute_value(stroke,none).
554		default_attribute_value(transform,none).
555		default_attribute_value(visibility,visible).
556
557		% is called in process_json when no SVG file specified
558		% VISB_SVG_BOX == rec(width:1000,height:1000,viewBox:"minx miny w h"),
559		get_SVG_BOX_definition(InlineObjects) :-
560		get_and_eval_special_definition('VISB_SVG_BOX','VISB_SVG_BOX',visb_box,DefPos,ResValue,InlineObjects),
561		(ResValue=(BH,BW) -> ViewBox=''
562		; get_VISB_record_fields(ResValue,Fields),
563		select(field(height,BH),Fields,F1),
564		select(field(width,BW),F1,F2)
565		-> (select(field(viewBox,VBVal),F2,F3)
566		-> (VBVal=string(VB) -> ViewBox=VB
567		% Viewbox is "mx my w h" string, ie: minimum_x, minimum_y, width and height
568		; VBVal = rec(VBFields)
569		-> (get_view_box_rec(VBFields,DefPos,ViewBox) -> true
570		; ViewBox='',
571		add_warning(visb_visualiser,'VISB_SVG_BOX viewBox record has illegal fields (expected minx miny width height):',VBVal,DefPos))
572		; add_warning(visb_visualiser,'VISB_SVG_BOX viewBox is not a string ("minx miny width height") or record:',VBVal,DefPos),
573		ViewBox=''
574		)
575		; ViewBox='', F3=F2
576		),
577		(F3=[] -> true
578		; add_warning(visb_visualiser,'VISB_SVG_BOX unknown attributes (not height, width, viewBox): ',F2,DefPos))
579		; add_error(visb_visualiser,'Ignoring VISB_SVG_BOX, must be record or pair of integers (height,width):',ResValue,DefPos)),
580		(get_number_from_bvalue(BH,H) -> true
581		; add_error(visb_visualiser,'VISB_SVG_BOX Height is not a number:',ResValue,DefPos)),
582		(get_number_from_bvalue(BW,W) -> true
583		; add_error(visb_visualiser,'VISB_SVG_BOX Width is not a number:',ResValue,DefPos)),
584		!,
585		assert_visb_empty_svg_box_height_width(H,W,ViewBox,DefPos).
586
587		get_view_box_rec([field(height,VH),field(minx,MXH),field(miny,MYH),field(width,VW)],DefPos,ViewBoxString) :-
588		(get_number_from_bvalue(VH,Height) -> true
589		; add_error('VISB_SVG_BOX viewBox\'height is not a number:',VH,DefPos),fail),
590		(get_number_from_bvalue(VW,Width) -> true
591		; add_error('VISB_SVG_BOX viewBox\'width is not a number:',VH,DefPos),fail),
592		(get_number_from_bvalue(MXH,MinX) -> true
593		; add_error('VISB_SVG_BOX viewBox\'minx is not a number:',VH,DefPos),fail),
594		(get_number_from_bvalue(MYH,MinY) -> true
595		; add_error('VISB_SVG_BOX viewBox\'miny is not a number:',VH,DefPos),fail),
596		ajoin([MinX,' ',MinY,' ', Width,' ',Height],ViewBoxString).
597
598
599		assert_visb_empty_svg_box_height_width(H,W,_ViewBox,Pos) :-
600		retract(visb_empty_svg_box_height_width(OldH,OldW,_)),
601		(OldH,OldW) \= (H,W),
602		add_message(visb_visualiser,'Overriding VisB SVG_BOX default dimensions: ',(OldH,OldW),Pos),
603		fail.
604		assert_visb_empty_svg_box_height_width(H,W,ViewBox,_Pos) :-
605		%add_message(visb_visualiser,'Setting VisB SVG_BOX default dimensions: ',(H,W,ViewBox),Pos),
606		assert(visb_empty_svg_box_height_width(H,W,ViewBox)).
607
608		:- use_module(probsrc(bsyntaxtree), [get_texpr_pos/2]).
609		:- use_module(probsrc(bmachine),[b_sorted_b_definition_prefixed/4, b_get_typed_definition/3]).
610		% find DEFINITION with given prefix in name, evaluate it and return SVG_ID and attribute list:
611		% AllowSep = allow_seperation means that the record fields can be separated into static objects and dynamic updates
612		% and only static ones will be retained (dynamic ones dealt with later)
613		find_and_eval_visb_DEFINITION(DEFPREFIX, SVG_ID, AttrList,Desc, DefName, DefPos,EvalPos,
614		InlineObjects,AllowSep,ExpandedScope) :-
615		( b_sorted_b_definition_prefixed(expression,DEFPREFIX,DefName,DefPos),
616		if(b_get_typed_definition(DefName,ExpandedScope,Body),true,
617		(add_message(visb_visualiser,'Ignoring VisB DEFINITION due to errors: ',DefName),fail)),
618		Kind=unknown
619		; special_backup(DEFPREFIX,Kind),
620		% also look at stored definitions (e.g., from static/dynamic separation of VISB_SVG_OBJECTS)
621		visb_special_definition(Kind,DefName,_Type,Body,_Class,DefPos)
622		),
623		set_error_context(visb_error_context(definition,DefName,'all_attributes',DefPos)),
624		call_cleanup((get_typed_static_definition_with_constants_state(DefName,Body,
625		ResBody,DefPos,ConstState,InlineObjects,AllowSep),
626		(get_texpr_pos(ResBody,Pos0) -> true ; Pos0=DefPos), % this could be a part of the full definition body
627		get_visb_DEFINITION_svg_object(Kind,DefName,ResBody,Pos0,ConstState,SVG_ID,AttrList,Desc,EvalPos)),
628		clear_error_context).
629
630		special_backup('VISB_SVG_HOVERS',visb_hovers).
631
632		% evaluate a typed body expressions evaluating to a record or set of records
633		% and translate into SVG attribute lists:
634		get_visb_static_svg_object_for_typed_expr(Kind,DefName,Body,DefPos,SVG_ID,AttrList,Desc,InnerPos) :-
635		AllowSep=no_separation,
636		Inline=no_inlining,
637		get_typed_static_definition_with_constants_state(DefName,Body,ResBody,DefPos,ConstState,Inline,AllowSep),
638		get_visb_DEFINITION_svg_object(Kind,DefName,ResBody,DefPos,ConstState,SVG_ID,AttrList,Desc,InnerPos).
639
640
641		flatten_couple(b(couple(A,B),_,_)) --> !,flatten_couple(A),flatten_couple(B).
642		% we could also flatten union(A,B), but at the risk of duplicate warnings when the same element occurs in A and B
643		flatten_couple(A) --> [A].
644
645		get_typed_static_definition_with_constants_state(DefName,Body,ResBody,DefPos,ConstantsState,InlineObjects,AllowSep) :-
646		flatten_couple(Body,TupleList,[]),
647		% the VISB_SVG_OBJECT definition may consist of a tuple (Obj1,Obj2,...) to allow grouping
648		(TupleList = [_,_|_]
649		-> add_debug_message(visb_visualiser,'Decomposed VisB definition body tuple:',DefName,DefPos)
650		; true),
651		nth1(DefNr,TupleList,TupleBody),
652		(get_texpr_pos(TupleBody,TuplePos) -> true ; TuplePos=DefPos),
653		get_typed_static_definition_with_constants_state3(DefName,DefNr,TupleBody,ResBody,TuplePos,
654		ConstantsState,InlineObjects,AllowSep).
655		get_typed_static_definition_with_constants_state3(DefName,DefNr,Body,ResBody,DefPos,ConstantsState,InlineObjects,AllowSep) :-
656		determine_type_of_visb_formula(Body,TIds,Class),
657		debug_format(19,'Detected VisB DEFINITION ~w (~w)~n',[DefName,Class]),
658		(%Class=requires_variables, % now also useful if event field present
659		AllowSep=allow_separation, % allowed for VISB_SVG_OBJECTS
660		if(separate_into_static_and_dynamic_part(DefName,DefNr,Body,StaticBody,DynamicBody,EventBody,HoverBody),
661		true,
662		(get_texpr_type(Body,Type),
663		(contains_events_or_hovers_field(Type)
664		-> add_warning(visb_visualiser,'Static/Dynamic separation failed for (required for events or hovers): ',DefName,DefPos)
665		% VISB_SVG_OBJECT definition contains events/hovers and as such requires separation; which failed here
666		; add_debug_message(visb_visualiser,'Static/Dynamic separation failed or not useful for: ',DefName,DefPos)
667		),
668		fail)),
669		determine_type_of_visb_formula(StaticBody,SIds,SClass),
670		get_unique_initial_state_for_visb(SClass,DefName,DefPos,SIds,ConstantsState)
671		-> Separated=true, ResBody=StaticBody,
672		add_debug_message(visb_visualiser,'Automatically separated fields into static and dynamic: ',DefName,DefPos),
673		%write('STATIC: '),translate:print_bexpr(StaticBody),nl, write('DYNAMIC: '),translate:print_bexpr(DynamicBody),nl,
674		assert_visb_udpate_def_body(visb_updates,DefName,DynamicBody,DefPos),
675		add_visb_events_from_def_body(visb_events,DefName,EventBody,DefPos),
676		assert_visb_udpate_def_body(visb_hovers,DefName,HoverBody,DefPos) % needs to be asserted so that it can be evaluated after svg objects have been created to extract exit value
677		; get_unique_initial_state_for_visb(Class,DefName,DefPos,TIds,ConstantsState)
678		-> ResBody=Body
679		; ResBody=Body,
680		(Class=requires_constants ->
681		get_texpr_ids(TIds,Ids),
682		% we could check if values of Ids are identical in all constants solutions
683		(is_concrete_constants_state_id(_)
684		-> BMsg='multiple solutions for used constants exist: '
685		; BMsg='but no constants were found or setup yet: '
686		),
687		ajoin(['DEFINITION ',DefName, ' requires constants but ',BMsg],Msg),
688		(get_a_constants_state(ConstantsState,StateID,InlineObjects)
689		-> (member(CstID,Ids),
690		other_constant_value_exists_for(CstID,ConstantsState,StateID)
691		-> add_warning(visb_visualiser,Msg,CstID,DefPos)
692		; ajoin(['DEFINITION ',DefName,
693		' requires constants and all SETUP_CONSTANTS solutions have same value thus far: '],Msg2),
694		% constraint-based checks or execute by predicate could later create others !
695		add_message(visb_visualiser,Msg2,Ids,DefPos)
696		)
697		; add_error(visb_visualiser,Msg,Ids,DefPos), ConstantsState=[]
698		)
699		; ConstantsState=[]
700		)
701		),
702		(Class=requires_variables, Separated=false
703		-> get_texpr_ids(TIds,AIds),
704		include(b_is_variable,AIds,VIds),
705		ajoin_with_sep(VIds,',',SVids),
706		(get_preference(visb_allow_variables_for_objects,false)
707		-> ajoin(['Ignoring DEFINITION which requires variables ',SVids,': '],WMsg),
708		add_warning(visb_visualiser,WMsg,DefName,DefPos),fail
709		; ConstantsState=[]
710		-> add_warning(visb_visualiser,'Ignoring DEFINITION which requires variables, could not find unique initial state: ',DefName,DefPos),fail
711		; ajoin(['DEFINITION requires variables ',SVids,
712		'; exporting history to HTML may not work correctly: '],WMsg),
713		add_message(visb_visualiser,WMsg,DefName,DefPos)
714		)
715		; true).
716
717
718		:- use_module(probsrc(bsyntaxtree), [create_couple/2, create_couple/3]).
719		% separate/split/filter VISB_SVG_OBJECTS definitions into a static part and a dynamic part depending on variables
720		% (aka updates/items)
721		separate_into_static_and_dynamic_part(DefName,DefNr,Body,StaticBody,DynamicBody,EventBody,HoverBody) :-
722		separate_static_dyn_aux(DefName,DefNr,[],[],Body,StaticBody,DynamicBody,EventBody,HoverBody).
723
724		separate_static_dyn_aux(DefName,DefNr,OuterQuantifiedIds,Path,b(couple(A,B),_,_Info),
725		StaticCouple,DynamicCouple,EventCouple,HoverCouple) :- !,
726		separate_static_dyn_aux(DefName,DefNr,OuterQuantifiedIds,[0|Path],A,SA,DA,EA,HA),
727		separate_static_dyn_aux(DefName,DefNr,OuterQuantifiedIds,[1|Path],B,SB,DB,EB,HB),
728		create_couple(SA,SB,StaticCouple),
729		create_couple(DA,DB,DynamicCouple),
730		create_couple(EA,EB,EventCouple),
731		create_couple(HA,HB,HoverCouple).
732		separate_static_dyn_aux(DefName,DefNr,OuterQuantifiedIds,Path,TExpr,
733		b(StaticSetComp,set(ST),I),
734		b(DynamicSetComp,set(DT),I),
735		b(EventsSetComp,set(ET),I),
736		b(HoversSetComp,set(HT),I)) :-
737		bsyntaxtree:is_eventb_comprehension_set(TExpr,Ids,Pred,Expr),
738		(OuterQuantifiedIds = []
739		-> add_debug_message(visb_visualiser,'Top-level set comprehensions for VISB: ',Ids,TExpr)
740		; add_message(visb_visualiser,'Nested set comprehensions for VISB: ',OuterQuantifiedIds,TExpr)
741		),
742		!,
743		determine_type_of_visb_formula(b(exists(Ids,Pred),pred,[]),SIds,Class),
744		(get_unique_initial_state_for_visb(Class,DefName,Pred,SIds,_)
745		-> true % The predicate must be statically executable
746		; add_message(visb_visualiser,'Cannot statically evaluate comprehension set domain: ',Pred,Pred),
747		% at the moment we require the domain to be computable statically for both static/dynamic attributes
748		fail
749		),
750		append(OuterQuantifiedIds,Ids,NewOuterQuantifiedIds),
751		separate_static_dyn_aux(DefName,DefNr,NewOuterQuantifiedIds,Path,Expr,
752		StaticRec,DynamicRec,EventRec,HoverRec),
753		get_texpr_type(StaticRec,ST),
754		get_texpr_type(DynamicRec,DT),
755		get_texpr_type(EventRec,ET),
756		get_texpr_type(HoverRec,HT),
757		bsyntaxtree:get_texpr_info(TExpr,I),
758		b_ast_cleanup:rewrite_event_b_comprehension_set(Ids,StaticRec,Pred, set(ST), StaticSetComp),
759		b_ast_cleanup:rewrite_event_b_comprehension_set(Ids,DynamicRec,Pred,set(DT), DynamicSetComp),
760		b_ast_cleanup:rewrite_event_b_comprehension_set(Ids,EventRec,Pred,set(ET), EventsSetComp),
761		b_ast_cleanup:rewrite_event_b_comprehension_set(Ids,HoverRec,Pred,set(HT), HoversSetComp).
762		separate_static_dyn_aux(DefName,DefNr,OuterQuantifiedIds,Path,b(rec(Fields),_,Info),
763		b(rec(StaticFields),record(SFT),Info), % VISB_OBJECTS (static)
764		b(UpdateRecWithDynamicFields,record(DFT),Info), % VISB_UPDATES (dynamic)
765		b(rec(AllEventFields),record(EFT),Info), % VISB_EVENTS
766		b(rec(AllHoverFields),record(HFT),Info) % VISB_HOVERS
767		) :- !,
768		split_list(is_visb_event_field,Fields,EventFields,ObjectAndHoverFields),
769		(select(field(hovers,HoverRec),ObjectAndHoverFields,ObjectFields)
770		-> HoverFields = [field(hovers,HoverRec)] % record deconstructed in add_visb_hovers_from_definition
771		; ObjectFields=ObjectAndHoverFields, HoverFields = []),
772		% maplist(check_field_is_supported(Info),ObjectFields), % will lead to duplicate warning messages, check_visb_update_type e.g., will be called for dynamic updates
773		separate_fields(ObjectFields,StaticFields0,DynamicFields,DefName),
774		(member(field(svg_class,_SVG_Class),StaticFields0) -> true
775		; member(field(svg_class,SVG_Class),DynamicFields)
776		-> add_warning(visb_visualiser,'SVG svg_class field is not static in: ',DefName,SVG_Class),
777		fail
778		; add_warning(visb_visualiser,'No svg_class field in: ',DefName,Info),
779		fail
780		),
781		(member(field(id,SVGID),StaticFields0)
782		-> (DynamicFields \= [] ; EventFields \= [] ; HoverFields \= [] % separation is useful for this record
783		; Path \= [] % we are part of a couple; maybe other records have a dynamic,event or hover part; so proceed
784		),
785		StaticFields = StaticFields0,
786		TStatic_SVGID = SVGID
787		; member(field(id,SVGID),DynamicFields)
788		-> add_warning(visb_visualiser,'SVG id field is not static in: ',DefName,SVGID),
789		fail
790		; OuterQuantifiedIds = []
791		-> gensym(svg_id,GenID),
792		ajoin(['Generated id ',GenID, ' for SVG object without id field in: '],Msg),
793		add_debug_message(visb_visualiser,Msg,DefName,Info),
794		SVGID = b(string(GenID),string,[]),
795		sort([field(id,SVGID) | StaticFields0],StaticFields)
796		; % the record is quantified within a set comprehension; we need to compute the ID from OuterQuantifiedIds
797		% it has to be identical for VISB_SVG_OBJECTS and VISB_SVG_UPDATES
798		SVGID = b(ExtFunCall,string,[]),
799		convert_path_to_int(Path,IntPath),
800		PathExpr = b(integer(IntPath),set(integer),[]),
801		create_couple([b(string(DefName),string,[]),b(integer(DefNr),integer,[]),PathExpr|OuterQuantifiedIds],Tuple),
802		% add DefName and DefNr to avoid clash if other Definition has same quantified ids
803		ExtFunCall = external_function_call('SHA_HASH_HEX',[Tuple]),
804		add_debug_message(visb_visualiser,'Generated SHA_HASH_HEX call for id of SVG objects without id field in: ',DefName,Info),
805		sort([field(id,SVGID) | StaticFields0],StaticFields)
806		),
807		maplist(get_field_type,StaticFields,SFT),
808		( (select(field(visibility,VisibExpr),DynamicFields,RestDynamicFields)
809		; member(field(visibility,VisibExpr),StaticFields0), % the visibility expression is static
810		RestDynamicFields = DynamicFields
811		),
812		RestDynamicFields = [_|_],
813		\+ hovers_can_set_visibility(HoverFields),
814		(nonvar(TStatic_SVGID), TStatic_SVGID = b(string(Static_SVGID),_,_) % TODO: evaluate properly
815		-> \+ visb_has_visibility_hover(Static_SVGID) % TODO: check no other hover definition added later
816		; true) % the ID is generated and cannot be accessed by other hovers which could make object visible
817		-> % create IF-THEN-ELSE to avoid evaluating fields when object not visible; also fixes WD issues
818		TRUE = b(boolean_true,boolean,[]),
819		sort([field(id,SVGID),field(visibility,TRUE)|RestDynamicFields],AllDynamicFields),
820		maplist(construct_dummy_value,RestDynamicFields,RestDummyFields),
821		sort([field(id,SVGID),field(visibility,b(boolean_false,boolean,[]))|RestDummyFields],AllDummyFields),
822		create_visibility_check(VisibExpr,VisibilityCond),
823		UpdateRecWithDynamicFields = if_then_else(VisibilityCond,
824		b(rec(AllDynamicFields),record(DFT),Info),
825		b(rec(AllDummyFields),record(DFT),Info)),
826		add_debug_message(visb_visualiser,'Refactoring VisB Record with visibility attribute: ',VisibilityCond)
827		% ,translate:print_bexpr(b(UpdateRecWithDynamicFields,any,[])),nl
828		; sort([field(id,SVGID)|DynamicFields],AllDynamicFields), % TODO: use kernel_records
829		UpdateRecWithDynamicFields = rec(AllDynamicFields)
830		),
831		maplist(get_field_type,AllDynamicFields,DFT),
832		sort([field(id,SVGID)|EventFields],AllEventFields), % ditto
833		maplist(get_field_type,AllEventFields,EFT),
834		sort([field(id,SVGID)|HoverFields],AllHoverFields), % ditto
835		maplist(get_field_type,AllHoverFields,HFT).
836		separate_static_dyn_aux(DefName,DefNr,OuterQuantifiedIds,_Path,TEXPR, _, _, _,_) :-
837		ajoin(['Uncovered expression for ',DefName,'-',DefNr,' ',OuterQuantifiedIds],Msg),
838		add_debug_message(visb_visualiser,Msg,TEXPR,TEXPR),fail.
839
840		hovers_can_set_visibility(HoverFields) :- member(field(hovers,Expr),HoverFields),
841		hover_expr_can_set_visibility(Expr).
842
843		hover_expr_can_set_visibility(b(E,_,_)) :- hovers_can_set_visib_aux(E).
844		hovers_can_set_visib_aux(couple(A,B)) :- !, (hover_expr_can_set_visibility(A) ; hover_expr_can_set_visibility(B)).
845		hovers_can_set_visib_aux(rec(Fields)) :- !, member(field(visibility,_),Fields).
846		hovers_can_set_visib_aux(set_extension(L)) :- !, member(E,L), hover_expr_can_set_visibility(E).
847		hovers_can_set_visib_aux(E) :- write(assume_hover_can_set_visibility(E)),nl.
848		% TODO: synchronise with flex_expand and check we cover all relevant cases like partial functions
849
850		:- use_module(probsrc(bsyntaxtree), [create_equality/3]).
851		create_visibility_check(VisibExpr,VisibilityCond) :- get_texpr_type(VisibExpr,string),!,
852		VISIBLE = b(string('visible'),string,[]),
853		create_equality(VisibExpr,VISIBLE,VisibilityCond).
854		create_visibility_check(VisibExpr,VisibilityCond) :-
855		TRUE = b(boolean_true,boolean,[]),
856		create_equality(VisibExpr,TRUE,VisibilityCond).
857
858		:- use_module(probsrc(typing_tools),[any_value_for_type/2]).
859		construct_dummy_value(field(Name,TExpr),field(Name,b(value(DummyValue),Type,[]))) :-
860		get_texpr_type(TExpr,Type),
861		any_value_for_type(Type,DummyValue). % object not visible: do not evaluate expression; just produce dummy value
862
863		% treat path of 0,1 as binary number
864		convert_path_to_int([],0).
865		convert_path_to_int([H|T],Res) :- convert_path_to_int(T,IT),
866		Res is IT*2+H.
867
868		% is the name of a field for events inside a VISB_SVG_OBJECT record
869		is_visb_event_field(field(Name,_)) :- is_visb_event_field_name(Name).
870		is_visb_event_field_name(event).
871		is_visb_event_field_name(events). % tuple or set of events inside VISB_SVG_OBJECTS
872		is_visb_event_field_name(predicate).
873		% is the name of a field for hovers inside a VISB_SVG_OBJECT record
874		%is_visb_hover_field_name(hovers).
875		%is_visb_hover_field_name(items). % enable items
876		%is_visb_hover_field_name(optional). % not needed ?
877		%is_visb_hover_field_name(override). % not needed ?
878
879		% check if the type of a VISB_SVG_OBJECTS expression requires separation for hovers/events
880		contains_events_or_hovers_field(set(X)) :- contains_events_or_hovers_field(X).
881		contains_events_or_hovers_field(couple(A,B)) :-
882		(contains_events_or_hovers_field(A) -> true ; contains_events_or_hovers_field(B)).
883		contains_events_or_hovers_field(record(F)) :- member(field(Name,_),F),
884		(is_visb_event_field_name(Name) -> true ; is_visb_event_field_name(Name)).
885
886		get_field_type(field(Name,Expr),field(Name,T)) :- get_texpr_type(Expr,T).
887
888		% separate fields from a SVG/VISB_SVG_OBJECT record into static part and dynamic update expressions
889		separate_fields([],[],[],_).
890		separate_fields([field(Field,Expr)|T],[field(Field,Expr)|TS],TD,DefName) :-
891		is_static_expr(Expr,Field,DefName),!,
892		separate_fields(T,TS,TD,DefName).
893		separate_fields([field(Field,Expr)|T],[field(Field,Default)|TS],[field(Field,Expr)|TD],DefName) :-
894		requires_static_default_value(Field,Default), !,
895		separate_fields(T,TS,TD,DefName).
896		separate_fields([H|T],TS,[H|TD],DefName) :-
897		separate_fields(T,TS,TD,DefName).
898
899		% fields which require a static default value; here to set up child SVG objects of title
900		% static default values could also be useful for hovers in general?
901		requires_static_default_value(title,b(string('-title-not-set-'),string,[])).
902
903		% virtual SVG attributes which are translated to children tags/objects
904		attribute_automatically_creates_children(title).
905
906		is_static_expr(Expr,Field,DefName) :-
907		determine_type_of_visb_formula(Expr,_TIds,Class), % TODO pass local variables from exists above
908		(Class=requires_nothing -> true
909		; Class=requires_constants,
910		\+ multiple_concrete_constants_exist, % TODO: check if _TIds have multiple solutions
911		is_concrete_constants_state_id(_) -> true
912		; ajoin(['Detected dynamic expression for field ',Field,' in ',DefName,': '],Msg),
913		add_debug_message(visb_visualiser,Msg,Expr,Expr),fail
914		).
915
916		% --------
917
918
919		extract_attribute_from_record(DefPos,field(OrigName,Value),svg_attribute(Name,SVal)) :-
920		opt_rewrite_field_name(OrigName,Name),
921		extract_attribute_value(DefPos,Name,Value,SVal).
922		extract_attribute_from_record(DefPos,F,_) :-
923		add_error(bvisualiser,'Extract SVG attribute failed: ',F,DefPos),fail.
924
925		% extract a value for a particular field Name
926		extract_attribute_value(DefPos,Name,Value,SVal) :-
927		(deconstruct_singleton_set(Name,Value,Element)
928		-> Element \= '$optional_field_absent',
929		extract_attr_value(Name,Element,SVal,DefPos)
930		; extract_attr_value(Name,Value,SVal,DefPos)
931		).
932
933		:- use_module(probsrc(specfile), [classical_b_mode/0]).
934
935		% in TLA+ mode optional record fields have {TRUE|->VALUE} rather than VALUE
936		% this can also be useful in B to allow mixing different SVG records in a set
937		% for Alloy mode we may want to also support singleton sets as scalars
938		deconstruct_singleton_set(Name,Set,Res) :-
939		singleton_set(Set,El),
940		detect_partial_records_for_field(Name),
941		(El=(pred_true,El2)
942		-> Val=El2 % TLA2B encoding for optional fields that are present
943		; Val=El), % Alloy
944		!,
945		Res = Val.
946		deconstruct_singleton_set(Name,[],Res) :-
947		detect_partial_records_for_field(Name),
948		Res = '$optional_field_absent'.
949
950		detect_partial_records_for_field(children) :- !, fail. % children field for groups is a set of ids
951		detect_partial_records_for_field(Name) :-
952		is_svg_number_attribute(Name),!. % sets never sensible as a numerical value
953		detect_partial_records_for_field(Name) :- is_id_or_text_attribute(Name),!. % ditto for ids
954		detect_partial_records_for_field(Name) :- is_svg_color_attribute(Name),!. % ditto for colors
955		detect_partial_records_for_field(_) :-
956		\+ classical_b_mode. % TODO: check that we are in TLA or Alloy mode?
957		% TODO: ensure ProB2 sets animation minor mode for TLA
958
959		:- use_module(probsrc(tools),[split_chars/3, safe_number_codes/2,safe_atom_codes/2]).
960		:- use_module(extrasrc(external_functions_svg),[svg_points/4]).
961		extract_attr_value(Name,Value,SVal,DefPos) :-
962		is_svg_number_attribute(Name),!, % we could try and extract svg_class from attribute list above
963		(get_number_from_bvalue(Value,NrVal)
964		-> SVal=NrVal % convert to atom?
965		; b_value_to_string(Value,SVal),
966		(is_special_svg_number_form(SVal) -> true
967		; atom_codes(SVal,CC),
968		safe_number_codes(_NrVal,CC) -> true
969		; ajoin(['The value of the SVG attribute "',Name,
970		'" is not a number: '],Msg),
971		add_warning(visb_visualiser,Msg,SVal,DefPos)
972		)
973		).
974		extract_attr_value(children,Value,SVal,DefPos) :- !,
975		(is_set_value(Value,extract_attr_value)
976		-> (try_expand_custom_set_with_catch(Value,ExpandedSet,extract_attr_value),
977		maplist(b_value_to_id_string,ExpandedSet,SVal) -> true
978		; add_warning(visb_visualiser,'The children attribute should be a finite set of identifiers: ',Value,DefPos),
979		SVal=[]
980		)
981		; add_warning(visb_visualiser,'The children attribute should be a set of identifiers: ',Value,DefPos),
982		SVal=[]).
983		extract_attr_value(points,Value,SVal,DefPos) :- % Class should be polygon or polyline
984		% automatically translate sequences of pairs of numbers to SVG string format
985		(Value = [(int(_),_)|_] ; Value = avl_set(node((int(_),_),_,_,_,_))), % TODO: check typing
986		svg_points(Value,Str,DefPos,no_wf_available),!,
987		string(SVal)=Str.
988		extract_attr_value(points,Value,SVal,_DefPos) :- Value = [],!, SVal = ''.
989		extract_attr_value(visibility,Value,SVal,DefPos) :- !,
990		% convert TRUE -> visible, FALSE -> hidden
991		( Value=pred_true -> TxtVal='visible'
992		; Value=pred_false -> TxtVal='hidden'
993		; b_value_to_text_string(Value,TxtVal),
994		(member(TxtVal,[collapse,hidden,visible]) -> true
995		; add_warning(visb_visualiser,'Value of SVG attribute "visibility" must be collapse,hidden or visible and not: ',TxtVal,DefPos))
996		),
997		SVal=TxtVal.
998		extract_attr_value(Name,Value,_,DefPos) :-
999		is_svg_color_attribute(Name),
1000		illegal_color(Value),
1001		ajoin(['Value of SVG attribute "',Name,
1002		'" is not a colour: ' ],Msg),
1003		add_warning(visb_visualiser,Msg,Value,DefPos),fail.
1004		extract_attr_value(Name,Value,SVal,_) :-
1005		is_id_or_text_attribute(Name),!,
1006		(is_text_attribute(Name)
1007		-> b_value_to_text_string(Value,SVal)
1008		; b_value_to_id_string(Value,SVal)).
1009		extract_attr_value(Attr,RawValue,ResValue,_DefPos) :- raw_value_attribute(Attr),!, % keep value intact
1010		ResValue = RawValue.
1011		extract_attr_value(_Name,Value,SVal,_) :-
1012		b_value_to_string(Value,SVal).
1013
1014		% do not convert to string; these are treated separately
1015		raw_value_attribute(hovers).
1016		raw_value_attribute(events).
1017
1018		% now checked by check_attribute_type for updates, we could later check strings, currentcolor is allowed
1019		illegal_color(pred_false).
1020		illegal_color(pred_true).
1021		illegal_color([]).
1022		illegal_color(avl_set(_)).
1023		illegal_color([_|_]).
1024		illegal_color(closure(_,_,_)).
1025		illegal_color(term(floating(_))).
1026
1027		% evaluate a DEFINITION to a set of B records representing SVG objects
1028		% returns a possibly refined sub-position corresponding to generated SVG objects as last argument
1029		get_visb_DEFINITION_svg_object(SpecialClass,DefName,Body,_DefPos,ExpandedState,SVG_ID,AttrList,Desc,InnerPos) :-
1030		get_preference(visb_show_debug_infos,true),
1031		bsyntaxtree:is_eventb_comprehension_set(Body,Ids,Pred,Expr),
1032		% try and separate couple in Expr so that we have better position info for source of VISB_SVG_OBJECTS
1033		Body = b(_,Type,II),
1034		Expr = b(couple(_,_),_,_),
1035		!,
1036		couple_member(NewExpr,Expr), % evaluate each part of the couple in isolation, with better position info
1037		get_texpr_pos(NewExpr,InnerPos),
1038		b_ast_cleanup:rewrite_event_b_comprehension_set(Ids,NewExpr,Pred, Type, NewBody),
1039		get_visb_DEF_svg_object_aux(SpecialClass,DefName,b(NewBody,Type,II),InnerPos,ExpandedState,SVG_ID,AttrList,Desc).
1040		get_visb_DEFINITION_svg_object(SpecialClass,DefName,Body,DefPos,ExpandedState,SVG_ID,AttrList,Desc,DefPos) :-
1041		get_visb_DEF_svg_object_aux(SpecialClass,DefName,Body,DefPos,ExpandedState,SVG_ID,AttrList,Desc).
1042
1043		couple_member(TExpr,b(couple(A,B),_,_)) :- !, (couple_member(TExpr,A) ; couple_member(TExpr,B)).
1044		couple_member(TExpr,TExpr).
1045
1046		get_visb_DEF_svg_object_aux(SpecialClass,DefName,Body,DefPos,ExpandedState,SVG_ID,AttrList,Desc) :-
1047		evaluate_visb_formula(Body,DefName,'',ExpandedState,ResValue,DefPos),
1048		flex_expand(ResValue,DefName,DefPos,Expanded,[]),
1049		(Expanded = [] -> add_message(visb_visualiser,'Empty set of SVG object records: ',DefName,DefPos)
1050		; Expanded =[Record|_] ->
1051		(get_VISB_record_fields(Record,Fs)
1052		% TODO: as we now can have different type of records, check in flex_expand below
1053		-> (member(field(id,_),Fs)
1054		-> true
1055		; add_message(visb_visualiser,'DEFINITION needs an `id` field if you want to use updates: ',DefName,DefPos)
1056		)
1057		; ajoin(['DEFINITION ', DefName,' should evaluate to a set of records or tuples of records: '],Msg),
1058		add_warning(visb_visualiser,Msg,Record,DefPos)
1059		)
1060		),
1061		member(Records,Expanded),
1062		get_VISB_record_fields(Records,Fields),
1063		(select(field(id,VID),Fields,F1)
1064		-> extract_attribute_value(DefPos,id,VID,SVG_ID)
1065		; gensym(svg_id,SVG_ID), F1=Fields),
1066		(select(field(comment,CC),F1,F2), b_value_to_string(CC,Desc) -> true
1067		; Desc = '', F2=F1),
1068		(SpecialClass=visb_updates, member(field(visibility,VV),F2),
1069		is_invisible(VV),
1070		\+ visb_has_visibility_hover(SVG_ID) % check for hover which may make object visible
1071		-> AttrList=[svg_attribute(visibility,'hidden')] % do not transmit updates
1072		; include_maplist(extract_attribute_from_record(DefPos),F2,AttrList),
1073		(select(svg_attribute(svg_class,SVG_Class),AttrList,A2)
1074		-> maplist(check_attribute_is_supported(SVG_Class,DefPos),A2)
1075		; true)
1076		).
1077
1078		is_invisible(string(hidden)). % also treat collapse ?
1079		is_invisible(pred_false).
1080
1081		% expand nested tuples/sets to a single list of SVG records (possibly of different types)
1082		flex_expand(Value,DefName,Pos) --> {is_custom_explicit_set(Value)},!,
1083		{try_expand_custom_set_with_catch(Value,ExpandedSet,flex_expand),
1084		(is_custom_explicit_set(ExpandedSet)
1085		-> ajoin(['Could not expand set of SVG object records or tuples thereof for ',DefName,': '],Msg),
1086		add_warning(visb_visualiser,Msg,Value,Pos),
1087		fail
1088		; true)},
1089		flex_expand(ExpandedSet,DefName,Pos).
1090		flex_expand([],_,_) --> !, [].
1091		flex_expand(L,_DefName,_Pos) --> {L =[(string(_),string(_))|_]}, !,
1092		[L]. % is probably a partial function {"id" |-> ,...}
1093		flex_expand([H|T],DefName,Pos) --> !, flex_expand(H,DefName,Pos), l_flex_expand(T,DefName,Pos).
1094		flex_expand((A,B),DefName,Pos) --> !, flex_expand(A,DefName,Pos), flex_expand(B,DefName,Pos).
1095		flex_expand(T,_,_) --> [T].
1096
1097		l_flex_expand([],_,_) --> !, [].
1098		l_flex_expand([H|T],DefName,Pos) --> !, flex_expand(H,DefName,Pos), l_flex_expand(T,DefName,Pos).
1099		l_flex_expand(T,_,_) --> [T].
1100
1101		flex_member(X,SetPairVal,DefName,Pos) :- flex_expand(SetPairVal,DefName,Pos,List,[]), member(X,List).
1102
1103
1104		% get the fields of a B value record
1105		% also transparently handles alternative representations, like a function from STRING to STRING
1106		get_VISB_record_fields(rec(Fields),Res) :- !, Res=Fields.
1107		get_VISB_record_fields(StringFunction,Fields) :-
1108		is_set_value(StringFunction,get_VISB_record_fields),
1109		try_expand_custom_set_with_catch(StringFunction,Expanded,get_VISB_record_fields),
1110		% TODO: check we have no duplicates
1111		maplist(convert_to_field,Expanded,Fields).
1112		% TODO: support records as generated by READ_XML:
1113		% rec(attributes:{("fill"|->"#90ee90"),("height"|->"360px"),("id"|->"background_rect"),("width"|->"600px"),("x"|->"1px"),("y"|->"2px")},element:"rect",meta:{("xmlLineNumber"|->"3")},pId:5,recId:6)
1114		% for <rect height="360px" x="1px" y="2px" id="background_rect" width="600px" fill="#90ee90"></rect>
1115
1116		convert_to_field((string(FieldName),Value),field(FieldName,Value)).
1117		% TODO: maybe handle enumerated set values as field names
1118
1119
1120		% already extract and type-check VISB_SVG_UPDATES definitions
1121		precompile_svg_object_updates(ExpandedScope) :-
1122		b_sorted_b_definition_prefixed(expression,'VISB_SVG_UPDATES',DefName,DefPos),
1123		b_get_typed_definition(DefName,ExpandedScope,TypedExpr),
1124		assert_visb_udpate_def_body(visb_updates,DefName,TypedExpr,DefPos),
1125		fail.
1126		precompile_svg_object_updates(_).
1127
1128		% assert VisB updates or hovers from B DEFINITION,
1129		% either from VISB_SVG_UPDATES or hovers or dynamic parts of VISB_SVG_OBJECTS:
1130		assert_visb_udpate_def_body(_Kind,DefName,TypedExpr,_DefPos) :-
1131		TypedExpr=b(rec([field(id,_)]),_,Info),!, % can happen when all fields are static
1132		add_debug_message(visb_visualiser,'Useless update/hover (just id field): ',DefName,Info).
1133		assert_visb_udpate_def_body(Kind,DefName,TypedExpr,DefPos) :-
1134		get_texpr_type(TypedExpr,Type),
1135		determine_type_of_visb_formula(TypedExpr,_,FormulaClass),
1136		debug_format(19,'Detected ~w: ~w (~w)~n',[Kind,DefName,FormulaClass]),
1137		assertz(visb_special_definition(Kind,DefName,Type,TypedExpr,FormulaClass,DefPos)),
1138		check_visb_update_type(Kind,Type,DefName,unknown_svg_class,DefPos).
1139
1140		% assert VisB events or hovers from B DEFINITION, from part of VISB_SVG_OBJECTS:
1141		% supporting event attribute and optional predicate attribute
1142		% Kind = visb_events or visb_hovers
1143		add_visb_events_from_def_body(Kind,DefName,Body,DefPos) :-
1144		get_texpr_type(Body,Type),
1145		\+ empty_update_or_hover_type(Type), % at least one more field than just id field
1146		get_visb_static_svg_object_for_typed_expr(Kind,DefName,Body,DefPos,SVG_ID,AttrList,Desc,InnerPos),
1147		add_visb_object_from_definition(Kind, SVG_ID, AttrList, Desc, DefName, InnerPos),
1148		fail.
1149		add_visb_events_from_def_body(_,_,_,_).
1150
1151		empty_update_or_hover_type(record(Fields)) :- !, Fields \= [_,_|_]. % at least one more field than just id field
1152		empty_update_or_hover_type(set(X)) :- !, empty_update_or_hover_type(X).
1153		empty_update_or_hover_type(couple(A,B)) :- !, empty_update_or_hover_type(A), empty_update_or_hover_type(B).
1154
1155		get_svg_object_updates_from_definitions(ExpandedBState,SVG_ID,SvgAttribute,Value,Pos) :-
1156		visb_special_definition(visb_updates,DefName,_Type,BodyTypedExpr,_Class,DefPos),
1157		get_visb_DEFINITION_svg_object(visb_updates,DefName,BodyTypedExpr,DefPos,ExpandedBState,SVG_ID,AttrList,_Desc,Pos),
1158		member(svg_attribute(SvgAttribute,Value),AttrList).
1159
1160		check_visb_update_type(Kind,Type,DefName,Class,DefPos) :-
1161		get_update_record_fields_type(Type,Fields),
1162		% other types are STRING +-> STRING, ...; this will be checked in get_visb_DEFINITION_svg_object
1163		(memberchk(field('svg_class',_),Fields)
1164		-> add_warning(visb_visualiser,'VisB updates should not set svg_class:',DefName,DefPos)
1165		; true),
1166		member(field(Name,FieldType),Fields),
1167		(Name = trigger_id ->
1168		(Kind=visb_hovers -> true ;
1169		add_warning(visb_visualiser,'Attribute trigger_id can only be used for hovers:',DefName,DefPos)
1170		)
1171		; check_attribute_type(FieldType,Name,DefName,Class,DefPos)
1172		),
1173		fail.
1174		check_visb_update_type(_,_,_,_,_).
1175
1176		% get a fields type list from a type
1177		get_update_record_fields_type(set(X),Fields) :- !,
1178		get_update_record_fields_type(X,Fields).
1179		get_update_record_fields_type(record(Fields),R) :- !, R=Fields.
1180		get_update_record_fields_type(couple(A,B),Fields) :-
1181		(get_update_record_fields_type(A,Fields)
1182		; get_update_record_fields_type(B,Fields)).
1183
1184		:- use_module(probsrc(translate), [pretty_type/2]).
1185		% check B type of a field for an SVG update or object
1186		check_attribute_type(Type,Name,DefName,Class,DefPos) :- alternative_spelling(Name,AName),!,
1187		check_attribute_type(Type,AName,DefName,Class,DefPos).
1188		check_attribute_type(Type,Name,DefName,Class,DefPos) :- Class \= unknown_svg_class,
1189		check_is_number_attribute(Name,Class,DefPos),!,
1190		illegal_number_type(Type),
1191		ajoin(['Type of field ',Name,' of ', DefName, ' is not a number: '],Msg),
1192		pretty_type(Type,TS),
1193		add_warning(visb_visualiser,Msg,TS,DefPos).
1194		check_attribute_type(Type,Name,DefName,_,DefPos) :-
1195		is_svg_color_attribute(Name),!,
1196		illegal_col_type(Type),
1197		ajoin(['Type of field ',Name,' of ', DefName, ' is not a color: '],Msg),
1198		pretty_type(Type,TS),
1199		add_warning(visb_visualiser,Msg,TS,DefPos).
1200		check_attribute_type(_Type,Name,_DefName,Class,DefPos) :-
1201		check_attribute_name_is_supported(Class,Name,DefPos).
1202
1203		illegal_nr_or_col_type(boolean).
1204		illegal_nr_or_col_type(set(_)).
1205		illegal_nr_or_col_type(seq(_)).
1206		illegal_nr_or_col_type(record(_)).
1207		illegal_nr_or_col_type(couple(A,B)) :- (illegal_nr_or_col_type(A) -> true ; illegal_nr_or_col_type(B)).
1208		% check if couple types can work by concatenating string representations
1209
1210		illegal_col_type(X) :- illegal_nr_or_col_type(X),!.
1211		illegal_col_type(real).
1212		% integer ? or can we map integers to colours using a color scheme like in DOT?
1213
1214		illegal_number_type(X) :- illegal_nr_or_col_type(X),!.
1215		%illegal_number_type(global(_)). % what if we use a global set with weird constants using back-quotes ?
1216
1217		% ----------------
1218
1219		% parse and load an individual JSON VisB item, e.g, :
1220		% { "name":"xscale",
1221		% "value" : "(100.0 / real(TrackElementNumber))"
1222		% }
1223
1224		process_json_definition(File,json(List)) :-
1225		(get_attr_true(ignore,List,File) -> true % ignore this definition
1226		; process_json_def_lst(File,List)).
1227
1228		:- use_module(probsrc(bsyntaxtree), [get_texpr_type/2]).
1229		process_json_def_lst(File,List) :-
1230		force_del_attr_with_pos(name,List,string(ID),L1,File,NamePos),
1231		force_del_attr_with_pos(value,L1,string(Formula),L2,File,VPos),
1232		debug_format(19,' Processing definition for ~w with value-formula (lines ~w):~w~n',[ID,VPos,Formula]),
1233		!,
1234		set_gen_parse_errors(L2,VPos,GenParseErrors), % treat optional attribute
1235		process_json_definition(ID,NamePos,Formula,VPos,GenParseErrors).
1236		process_json_def_lst(File,List) :- get_pos_from_list(List,File,Pos),
1237		add_error(visb_visualiser,'Illegal VisB Definition:',List,Pos).
1238
1239		% we could also load a classical B Definition file and process its definitions like this:
1240		process_json_definition(ID,NamePos,Formula,VPos,GenParseErrors) :-
1241		atom_codes(Formula,FCodes),
1242		set_error_context(visb_error_context(definition,ID,'value',VPos)),
1243		(b_get_definition_name_with_pos(ID,_Arity,_DefType,_DPos)
1244		-> add_warning(visb_visualiser,'Ignoring VisB definition, DEFINITION of the same name already exists:',ID,NamePos)
1245		; parse_expr(FCodes,TypedExpr,GenParseErrors)
1246		-> add_visb_json_definition(ID,TypedExpr,VPos)
1247		; GenParseErrors=false -> formatsilent('Ignoring optional VisB definition for ~w due to error in B formula~n',[ID])
1248		; add_error(visb_visualiser,'Cannot parse or typecheck VisB formula for definition',ID,VPos)
1249		),
1250		clear_error_context.
1251
1252		add_visb_json_definition(ID,TypedExpr,VPos) :-
1253		get_texpr_type(TypedExpr,Type),
1254		determine_type_of_visb_formula(TypedExpr,TIds,Class), %write(type(ID,Class,TIds)),nl,
1255		(try_eval_static_def(Class,'static definition', ID,TypedExpr,TIds,StaticValue,VPos)
1256		-> get_texpr_type(TypedExpr,Type),StaticValueExpr = b(value(StaticValue),Type,[]),
1257		assert_visb_json_definition(ID,Type,StaticValueExpr,TIds,Class,VPos)
1258		; assert_visb_json_definition(ID,Type,TypedExpr,TIds,Class,VPos)
1259		).
1260
1261		% assert a VisB definition stemming from the JSON definitions section:
1262		assert_visb_json_definition(DefName,Type,TypedExpr,UsedTIds,Class,DefPos) :-
1263		(is_special_visb_def_name(DefName,SpecialClass) -> true ; SpecialClass = regular_def),
1264		assertz(visb_definition(DefName,Type,TypedExpr,Class,DefPos,SpecialClass)),
1265		(SpecialClass \= regular_def
1266		-> formatsilent('Detected special ~w definition ~w (~w)~n',[SpecialClass,DefName,Class]),
1267		add_special_json_definition(SpecialClass,DefName,Type,TypedExpr,UsedTIds,Class,DefPos)
1268		; true
1269		).
1270
1271		% register some special definitions, in which a set of objects/hovers/updates can be specified
1272		% by a single definition returning a set of records
1273		add_special_json_definition(visb_updates,DefName,Type,TypedExpr,_,Class,DefPos) :- !,
1274		check_visb_update_type(visb_updates,Type,DefName,Class,DefPos),
1275		assertz(visb_special_definition(visb_updates,DefName,Type,TypedExpr,Class,DefPos)). % will be evaluated later
1276		add_special_json_definition(visb_contents,DefName,Type,TypedExpr,_,Class,DefPos) :- !,
1277		assertz(visb_special_definition(visb_contents,DefName,Type,TypedExpr,Class,DefPos)).
1278		add_special_json_definition(visb_box,DefName,Type,TypedExpr,_,Class,DefPos) :- !,
1279		assertz(visb_special_definition(visb_box,DefName,Type,TypedExpr,Class,DefPos)).
1280		add_special_json_definition(visb_objects,DefName,_Type,TypedExpr,_UsedTIds,_Class,DefPos) :- !,
1281		AllowSep=allow_separation, % TODO: we re-determine the class and used ids below:
1282		get_typed_static_definition_with_constants_state(DefName,TypedExpr,ResBody,DefPos,CS,no_inlining,AllowSep),
1283		(get_visb_DEFINITION_svg_object(visb_objects,DefName,ResBody,DefPos,CS,SVG_ID,AttrList,Desc,InnerPos),
1284		%formatsilent('Adding ~w : ~w (from ~w)~n',[visb_objects,SVG_ID,DefName]),
1285		add_visb_object_from_definition(visb_objects, SVG_ID, AttrList, Desc, DefName, InnerPos),
1286		fail ; true).
1287		add_special_json_definition(SpecialClass,DefName,_Type,TypedExpr,UsedTIds,Class,DefPos) :-
1288		(get_unique_initial_state_for_visb(Class,DefName,DefPos,UsedTIds,ConstantsState) -> true
1289		; ConstantsState=[]),
1290		get_static_visb_state(ConstantsState,FullState), % add static VisB Defs
1291		(Class=requires_variables,
1292		(get_preference(visb_allow_variables_for_objects,false) ; ConstantsState=[])
1293		-> add_warning(visb_visualiser,'Ignoring VisB definition which requires variables:',DefName,DefPos)
1294		; get_visb_DEFINITION_svg_object(SpecialClass,DefName,TypedExpr,DefPos,FullState,SVG_ID,AttrList,Desc,InnerPos),
1295		%formatsilent('Adding ~w : ~w (from ~w)~n',[SpecialClass,SVG_ID,DefName]),
1296		add_visb_object_from_definition(SpecialClass, SVG_ID, AttrList, Desc, DefName, InnerPos)
1297		; true).
1298
1299		is_special_visb_def_name(DefName,visb_updates) :- atom_concat('VISB_SVG_UPDATES',_,DefName).
1300		is_special_visb_def_name(DefName,visb_hovers) :- atom_concat('VISB_SVG_HOVERS',_,DefName).
1301		is_special_visb_def_name(DefName,visb_objects) :- atom_concat('VISB_SVG_OBJECTS',_,DefName).
1302		is_special_visb_def_name(DefName,visb_contents) :- atom_concat('VISB_SVG_CONTENTS',_,DefName).
1303		is_special_visb_def_name('VISB_SVG_BOX',visb_box).
1304		% TODO: maybe provide VISB_HTML_CONTENTS which appear after the SVG
1305
1306		% evaluate static VisB defs only once or evaluate expressions in svg_objects and loop bounds
1307		eval_static_def(Class,VisBKind,ID,TypedExpr,UsedTIds,StaticValue,VPos) :-
1308		get_unique_initial_state_for_visb(Class,ID,VPos,UsedTIds,ConstantsState),
1309		evaluate_static_visb_formula(TypedExpr,VisBKind,ID,ConstantsState,StaticValue,VPos).
1310
1311		% only evaluate statically if possible; no warnings/messages if not possible (just fail)
1312		try_eval_static_def(requires_variables,_VisBKind,_ID,_TypedExpr,_UsedTIds,_StaticValue,_VPos) :- !,
1313		fail. % do not try to evaluate statically; events will change the variable values anyway
1314		try_eval_static_def(Class,VisBKind,ID,TypedExpr,UsedTIds,StaticValue,VPos) :-
1315		% TODO: disable messages for multiple constants values; just fail
1316		eval_static_def(Class,VisBKind,ID,TypedExpr,UsedTIds,StaticValue,VPos).
1317
1318		% check if a unique constant value exists for a model
1319		get_unique_initial_state_for_visb(requires_nothing,_,_,_,State) :- !, State=[].
1320		get_unique_initial_state_for_visb(Class,DefName,DefPos,_,State) :-
1321		\+ multiple_concrete_constants_exist,
1322		is_concrete_constants_state_id(StateID),!,
1323		(Class=requires_variables
1324		-> get_preference(visb_allow_variables_for_objects,true),
1325		unique_initialisation_id_exists_from(StateID,DefName,DefPos,State)
1326		% Note: variable can still be modified by other events later, e.g., in ProB2-UI
1327		; visited_expression(StateID,StateTerm),
1328		state_corresponds_to_set_up_constants_only(StateTerm,State)).
1329		get_unique_initial_state_for_visb(requires_constants,DefName,DefPos,Ids,State) :- Ids \= all,
1330		% try and see if all values for Ids are the same; TODO: also support requires_variables
1331		is_concrete_constants_state_id(StateID),!,
1332		visited_expression(StateID,StateTerm),
1333		state_corresponds_to_set_up_constants_only(StateTerm,State),
1334		(member(C,Ids), get_texpr_id(C,CstID),
1335		other_constant_value_exists_for(CstID,State,StateID)
1336		-> ajoin(['Multiple values for constant ',CstID, ' in context of: '],Msg),
1337		add_message(visb_visualiser,Msg,DefName,DefPos),fail
1338		; true).
1339
1340		get_a_constants_state(State,StateID,inline_objects(SingleStateId)) :-
1341		get_constants_state_id_for_id(SingleStateId,StateID),!,
1342		visited_expression(StateID,StateTerm),
1343		state_corresponds_to_set_up_constants_only(StateTerm,State).
1344		get_a_constants_state(State,StateID,InlineObjects) :-
1345		check_inlining(InlineObjects),
1346		is_concrete_constants_state_id(StateID),!,
1347		visited_expression(StateID,StateTerm),
1348		state_corresponds_to_set_up_constants_only(StateTerm,State).
1349
1350		check_inlining(no_inlining) :- !.
1351		check_inlining(inline_objects(_SingleStateId)) :- !.
1352		check_inlining(X) :- add_internal_error('Invalid inlining value:',check_inlining(X)).
1353
1354		:- use_module(probsrc(store), [lookup_value_for_existing_id/3]).
1355		other_constant_value_exists_for(CstID,State,StateId) :-
1356		lookup_value_for_existing_id(CstID,State,Val1),
1357		is_concrete_constants_state_id(StateId2), StateId2 \= StateId,
1358		visited_expression(StateId2,StateTerm2),
1359		state_corresponds_to_set_up_constants_only(StateTerm2,State2),
1360		lookup_value_for_existing_id(CstID,State2,Val2),
1361		Val2 \= Val1.
1362
1363
1364		unique_initialisation_id_exists_from(FromStateId,DefName,DefPos,State) :-
1365		transition(FromStateId,_,StateID),!,
1366		(transition(FromStateId,_,StateID2),
1367		StateID2 \= StateID
1368		-> ajoin(['Multiple initialisations exists (state ids ',StateID,',',StateID2,') for: '],Msg),
1369		add_message(visb_visualiser,Msg,DefName,DefPos),fail
1370		; true),
1371		visited_expression(StateID,StateTerm),
1372		state_corresponds_to_initialised_b_machine(StateTerm,State).
1373
1374		parse_expr_for_visb(Formula,JsonList,Pos,TypedExpr) :-
1375		set_gen_parse_errors(JsonList,Pos,GenParseErrors),
1376		parse_expr(Formula,TypedExpr,GenParseErrors).
1377
1378		set_gen_parse_errors(JSonList,Pos,GenParseErrors) :-
1379		(get_attr(optional,JSonList,_)
1380		-> GenParseErrors=false
1381		; %get_pos_from_list(JSonList,File,Position),
1382		GenParseErrors=gen_parse_errors_for(Pos)).
1383
1384		% ----------------
1385
1386		% parse and load an individual JSON SVG object listed under svg_objects, e.g, :
1387		% {
1388		% "svg_class":"rect",
1389		% "id":"train_rect",
1390		% "x":"0",
1391		% "y":"0",
1392		% "comment":"..."
1393		% },
1394		process_json_svg_object(File,Json) :-
1395		process_repeat(0,Json,File,add_visb_json_svg_object).
1396
1397		add_visb_json_svg_object(File,json(List)) :- get_attr_true(ignore,List,File), !. % ignore this item
1398		add_visb_json_svg_object(File,json(List)) :-
1399		(force_del_attr_with_pos(svg_class,List,string(SVG_Class),L1,File,Pos1) -> true % shape: line, rect, ...
1400		; infer_svg_class(List,SVG_Class,File,Pos1)
1401		-> add_message(visb_visualiser,'Inferred svg_class: ',SVG_Class,Pos1),L1=List),
1402		force_del_attr(id,L1,string(ID),L2,File),
1403		(del_attr(comment,L2,string(Desc),JsonList3) -> true ; Desc = '', JsonList3=L2),
1404		debug_format(19,' Creating new SVG object ~w with id:~w~n',[SVG_Class,ID]),
1405		add_debug_message(visb_visualiser,'New object: ',ID,Pos1),
1406		% TODO: we could pre-process all attributes not depending on %0, %1, ...
1407		maplist(get_svg_attr(SVG_Class,File),JsonList3,AttrList),
1408		%formatsilent('Adding SVG Object ~w with ID ~w (~w): ~w~n',[SVG_Class,ID,Desc,AttrList]),
1409		assert_visb_svg_object(ID,SVG_Class,AttrList,Desc,'JSON',Pos1),
1410		!.
1411		add_visb_json_svg_object(File,Json) :-
1412		!,
1413		get_pos_from_list(Json,File,Pos),
1414		add_error(visb_visualiser,'Illegal VisB additional SVG object:',Json,Pos).
1415
1416		infer_svg_class(List,line,File,Pos) :- get_attr_with_pos(x1,List,_,File,Pos),!.
1417		infer_svg_class(List,circle,File,Pos) :- get_attr_with_pos(r,List,_,File,Pos),!.
1418		infer_svg_class(List,rect,File,Pos) :- get_attr_with_pos(height,List,_,File,Pos),!.
1419		infer_svg_class(List,rect,File,Pos) :- get_attr_with_pos(width,List,_,File,Pos),!.
1420		infer_svg_class(List,ellipse,File,Pos) :- get_attr_with_pos(rx,List,_,File,Pos),!. % could also be rect
1421		infer_svg_class(List,text,File,Pos) :- get_attr_with_pos(text,List,_,File,Pos),!.
1422		infer_svg_class(List,g,File,Pos) :- get_attr_with_pos(children,List,_,File,Pos),!. % group + foreignObject have children
1423		infer_svg_class(List,use,File,Pos) :- get_attr_with_pos(href,List,_,File,Pos),!. % href can also be used with image, pattern, ...
1424
1425		% assert a new SVG object to be created upon SETUP_CONSTANTS/INITIALISATION:
1426		assert_visb_svg_object(ID,SVG_Class,_AttrList,_Desc,DefName,Pos1) :-
1427		visb_svg_object(ID,_,_,_,_Pos0),!,
1428		ajoin(['SVG object (from ',DefName,', svg_class=',SVG_Class,') with same id already created: '],Msg),
1429		add_warning(visb_visualiser,Msg,ID,Pos1).
1430		assert_visb_svg_object(_ID,_SVG_Class,AttrList,_Desc,_DefName,Pos1) :-
1431		\+ (AttrList=[] ; AttrList=[_|_]),!,
1432		add_error(visb_visualiser,'SVG objects attributes are not a list:',AttrList,Pos1).
1433		assert_visb_svg_object(ID,SVG_Class,AttrList,Desc,DefName,Pos1) :-
1434		check_svg_shape_class(ID,SVG_Class,Pos1),
1435		add_visb_debug_infos(ID,SVG_Class,AttrList,AttrList2,DefName,Pos1),
1436		sort(AttrList2,SAttrList),
1437		get_all_children(SAttrList,Children,RestAttrs,DefName,Pos1),
1438		(Children = [] -> true
1439		; svg_shape_can_have_children(SVG_Class) -> true % g, foreignObject, HTML tags
1440		; Children = [C1_ID|_], visb_svg_object(C1_ID,CAttr,_,_,_),
1441		attribute_automatically_creates_children(CAttr) % e.g., title object created for title attribute of ID
1442		-> true
1443		; add_message(visb_visualiser,'Children attribute only useful for certain SVG classes such as groups (g) or foreignObject or when adding title objects (as tooltips): ',Children,Pos1)
1444		),
1445		(select(svg_attribute(group_id,ParentGroupId),RestAttrs,RestAttrs2)
1446		-> assert_visb_svg_child(ParentGroupId,Pos1,ID) % register parent group id
1447		; RestAttrs2=RestAttrs),
1448		compute_auto_attributes(RestAttrs,RestAttrs2,SVG_Class,NewRestAttrs),
1449		assertz(visb_svg_object(ID,SVG_Class,NewRestAttrs,Desc,Pos1)),
1450		maplist(assert_visb_svg_child(ID,Pos1),Children).
1451
1452		% adapt visb_svg_object to provide developer debug infos, e.g., in title hover messages
1453		add_visb_debug_infos(ID,SVG_Class,AttrList,NewAttrList,DefName,Pos) :- SVG_Class \= title,
1454		get_preference(visb_show_debug_infos,true),
1455		(select(svg_attribute(title,Title),AttrList,RestAttrs) -> true
1456		; Title='', RestAttrs=AttrList),
1457		!,
1458		extract_span_description_with_opts(Pos,PosStr,
1459		[relative_file_name,compact_pos_info,
1460		inner_context_separator('\n in ','\n at ')]),
1461		%extract_definition_call_stack_desc(Pos,CS), already displayed in inner context
1462		ajoin(['-- VISB_DEBUG_INFO --\nid=',ID, '\nsvg_class=',SVG_Class, '\nsrc=',DefName,'\n', PosStr],DebugInfo),
1463		(Title='' -> NewTitle=DebugInfo ; ajoin([Title,'\n',DebugInfo],NewTitle)),
1464		%format('~nDEBUG::~n~w~n~w~n---~n',[ID,DebugInfo]),
1465		assert(visb_svg_object_debug_info(ID,DebugInfo)),
1466		NewAttrList = [svg_attribute(title,NewTitle)|RestAttrs].
1467		add_visb_debug_infos(_,_,AttrList,AttrList,_,_).
1468
1469		% compute the value of VisB auto attributes, e.g., automatically
1470		% doing a layout of objects in a grid
1471		% TODO: SVG/special_svg_number already supports auto but not for x,y coordinates?
1472		% TODO: try and determine width of object automatically; keep track of auto objects max height per row
1473		% TODO: support cx,cy
1474		compute_auto_attributes([],_,_,[]).
1475		compute_auto_attributes([svg_attribute(Attr,Val)|T],AllAttrs,SVG_Class,
1476		[svg_attribute(Attr,NewVal)|NT]) :-
1477		(Val=auto, compute_auto_attribute(Attr,AllAttrs,SVG_Class,NewVal)
1478		-> true
1479		; NewVal=Val),
1480		compute_auto_attributes(T,AllAttrs,SVG_Class,NT).
1481
1482		:- dynamic next_auto_x/1, next_auto_y/2.
1483		next_auto_x(0).
1484		next_auto_y(0,10).
1485		reset_auto_attrs :- retractall(next_auto_x(_)),
1486		retractall(next_auto_y(_,_)),
1487		assertz(next_auto_x(0)),
1488		assertz(next_auto_y(0,10)).
1489
1490		get_x_auto_limit(Limit) :- visb_empty_svg_box_height_width(_H,W,_ViewBox),!,
1491		Limit = W. %TODO: inspect viewBox
1492		get_x_auto_limit(400).
1493
1494		compute_auto_attribute(id,_,_,GenID) :- !, gensym(svg_id,GenID).
1495		compute_auto_attribute(Attr,AllAttrs,SVG_Class,Val) :-
1496		auto_compute_x_coordinate(Attr,Kind),!,
1497		retract(next_auto_x(XV)),
1498		(get_width(SVG_Class,AllAttrs,Offset) -> true ; Offset=10),
1499		Padding = 2, % TODO: make customisable
1500		NewXV is XV+Offset+Padding,
1501		get_x_auto_limit(Lim),
1502		(NewXV > Lim
1503		-> NewVal=0, retract(next_auto_y(OldY,YOffset)),
1504		(get_height(SVG_Class,AllAttrs,Offset) -> true ; Offset = 10),
1505		NewY is OldY+YOffset,
1506		assert(next_auto_y(NewY,YOffset))
1507		; NewVal=NewXV),
1508		assertz(next_auto_x(NewVal)),
1509		(Kind=left -> Val=XV ; Val is XV + Offset/2).
1510		compute_auto_attribute(Attr,AllAttrs,SVG_Class,Val) :- auto_compute_y_coordinate(Attr,Kind),
1511		next_auto_y(YV,_),
1512		(Kind = top -> Val = YV
1513		; get_height(SVG_Class,AllAttrs,Height) -> Val is YV + Height/2
1514		; Val is YV+5).
1515
1516		auto_compute_x_coordinate(x,left). % rect, ..
1517		auto_compute_x_coordinate(cx,center). % circle, ellipse
1518		auto_compute_y_coordinate(y,top). % rect, ..
1519		auto_compute_y_coordinate(cy,center). % circle, ellipse
1520
1521		get_width(rect,Attrs,Wid) :- member(svg_attribute(width,Wid),Attrs).
1522		get_width(circle,Attrs,Wid) :- member(svg_attribute(r,Radius),Attrs), Wid is 2*Radius.
1523		get_width(ellipse,Attrs,Wid) :- member(svg_attribute(rx,Radius),Attrs), Wid is 2*Radius.
1524		get_width(line,Attrs,Wid) :- member(svg_attribute(x1,X1),Attrs),
1525		member(svg_attribute(x2,X2),Attrs), Wid is abs(X2-X1).
1526
1527		get_height(rect,Attrs,Wid) :- member(svg_attribute(height,Wid),Attrs).
1528		get_height(circle,Attrs,Wid) :- member(svg_attribute(r,Radius),Attrs), Wid is 2*Radius.
1529		get_height(ellipse,Attrs,Wid) :- member(svg_attribute(ry,Radius),Attrs), Wid is 2*Radius.
1530		get_height(line,Attrs,Wid) :- member(svg_attribute(y1,X1),Attrs),
1531		member(svg_attribute(y2,X2),Attrs), Wid is abs(X2-X1).
1532
1533
1534		% register an SVG ID as child of a group
1535		assert_visb_svg_child(_ParentId,Pos,ChildID) :- visb_svg_child(ChildID,OldParent),!,
1536		ajoin(['SVG object already child of group ',OldParent,': '],Msg),
1537		add_warning(visb_visualiser,Msg,ChildID,Pos).
1538		assert_visb_svg_child(ParentId,Pos,ChildID) :- visb_svg_child(ParentId,ChildID),!, % TODO: full cycle detection
1539		ajoin(['SVG object already parent of group ',ParentId,' (cycle): '],Msg),
1540		add_warning(visb_visualiser,Msg,ChildID,Pos).
1541		assert_visb_svg_child(ParentId,_Pos,ChildID) :-
1542		assertz(visb_svg_child(ChildID,ParentId)),
1543		assertz(visb_svg_parent(ParentId,ChildID)).
1544
1545
1546
1547
1548		:- use_module(probsrc(gensym),[gensym/2]).
1549		% we need to translate a title attribute to a separate title object and add it as a child
1550		% see also post_process_visb_item which dispatches title updates to the child object
1551		get_all_children(SAttrList,Children,Rest,DefName,Pos) :-
1552		select(svg_attribute(title,Title),SAttrList,SList2),!,
1553		gensym(visb_title,TitleID),
1554		assert_visb_svg_object(TitleID,'title',[svg_attribute(text,Title)],'',DefName,Pos),
1555		add_debug_message(visb_visualiser,'Adding virtual title child object: ',TitleID,Pos),
1556		Children=[TitleID|TChilds],
1557		get_children_attribute(SList2,TChilds,Rest,Pos).
1558		get_all_children(SAttrList,Children,Rest,_,Pos) :-
1559		% get the children explicitly defined by the user:
1560		get_children_attribute(SAttrList,Children,Rest,Pos).
1561
1562		get_children_attribute(SAttrList,Children,Rest,Pos) :-
1563		select(svg_attribute(children,C),SAttrList,R),!,
1564		(is_list(C) -> Children=C
1565		; add_warning(visb_visualiser,'Children attribute should be a list (of SVG ids): ',C,Pos),
1566		Children=[]),
1567		Rest=R.
1568		get_children_attribute(SAttrList,[],SAttrList,_).
1569
1570
1571
1572		:- use_module(probsrc(tools_matching), [get_possible_fuzzy_matches_and_completions_msg/3,
1573		get_all_svg_classes/1, is_svg_shape_class/1,
1574		is_html_tag/1, is_html_attribute/1]).
1575
1576
1577		svg_shape_can_have_children(g).
1578		svg_shape_can_have_children(foreignObject).
1579		svg_shape_can_have_children(X) :- is_html_tag(X).
1580
1581
1582		% check whether svg_class value seems valid
1583		check_svg_shape_class(ID,Shape,Pos) :-
1584		(is_svg_shape_class(Shape) -> true
1585		; is_html_tag(Shape) ->
1586		(visb_svg_child(ID,ParentId),
1587		visb_svg_object(ParentId,ParClass,_,_,_),
1588		(is_html_tag(ParClass) -> true ; ParClass=foreignObject)
1589		-> add_debug_message(visb_visualiser,'HTML tag used as svg_class in foreignObject child: ',Shape,Pos)
1590		; ajoin(['SVG object ', ID, ' has HTML tag as svg_class (and should probably be a child of a foreignObject): '],Msg),
1591		add_message(visb_visualiser,Msg,Shape,Pos) % probably should be child of foreignObject
1592		)
1593		; get_all_svg_classes(Classes),
1594		get_possible_fuzzy_matches_and_completions_msg(Shape,Classes,FMsg)
1595		-> ajoin(['SVG object ', ID, ' has unknown svg_class (did you mean ',FMsg,' ?): '],Msg),
1596		add_warning(visb_visualiser,Msg,Shape,Pos)
1597		; ajoin(['SVG object ', ID, ' has unknown svg_class: '],Msg),
1598		add_message(visb_visualiser,Msg,Shape,Pos)
1599		).
1600
1601		% get SVG attribute for an svg_object:
1602		get_svg_attr(SVG_Class,File,'='(Attr,AttrVal,Pos),svg_attribute(Attr,Val)) :- !,
1603		construct_prob_pos_term(Pos,File,PosTerm),
1604		get_svg_static_attribute_value(Attr,SVG_Class,PosTerm,AttrVal,Val).
1605		get_svg_attr(_,File,Json,_) :-
1606		get_pos_from_list([Json],File,Position),
1607		add_error(visb_visualiser,'Illegal SVG object attribute',Json,Position),fail.
1608
1609		get_svg_static_attribute_value(Attr,SVG_Class,Pos,AttrVal,Nr) :-
1610		check_is_number_attribute(Attr,SVG_Class,Pos),
1611		\+ is_special_svg_number_form(AttrVal),
1612		!,
1613		(get_number_value(AttrVal,Nr,Attr,Pos) -> true
1614		; add_error(visb_visualiser,'Illegal number value:',AttrVal,Pos), Nr=0).
1615		get_svg_static_attribute_value(_,_,_,string(Val),Res) :- !, Res=Val.
1616		% for children we get something like array([string(button1_1),string(button1_2)])
1617		get_svg_static_attribute_value(Attr,SVG_Class,Pos,array(List),ResList) :- !,
1618		maplist(get_svg_static_attribute_value(Attr,SVG_Class,Pos),List,ResList).
1619		get_svg_static_attribute_value(_Attr,_,Pos,Val,Val) :-
1620		add_warning(visb_visualiser,'Illegal SVG object attribute value: ',Val,Pos).
1621
1622
1623		% detect special SVG number forms, like 50%
1624		is_special_svg_number_form(string(Atom)) :-
1625		atom_codes(Atom,Codes),
1626		special_svg_number(Codes,[]).
1627
1628		:- use_module(probsrc(self_check)).
1629		:- assert_must_succeed(visb_visualiser:special_svg_number("10%",[])).
1630		:- assert_must_succeed(visb_visualiser:special_svg_number("10 %",[])).
1631		:- assert_must_succeed(visb_visualiser:special_svg_number(" 99em ",[])).
1632		:- assert_must_succeed(visb_visualiser:special_svg_number("1.0em",[])).
1633		:- assert_must_fail(visb_visualiser:special_svg_number("10",[])).
1634		:- assert_must_fail(visb_visualiser:special_svg_number("10+nrcols+%0",[])).
1635		special_svg_number --> " ",!, special_svg_number.
1636		special_svg_number --> [X], {digit(X)},!, special_svg_number2.
1637		special_svg_number --> "auto".
1638		special_svg_number2 --> [X], {digit(X)},!, special_svg_number2.
1639		special_svg_number2 --> ".",!, special_svg_number2. % TODO: only allow one dot; + accept e notation?
1640	?	special_svg_number2 --> optws,!, svg_unit,!, optws.
1641
1642		% using info from https://oreillymedia.github.io/Using_SVG/guide/units.html
1643		svg_unit --> "%".
1644		svg_unit --> "ch".
1645		svg_unit --> "cm".
1646		svg_unit --> "em".
1647		svg_unit --> "ex".
1648		svg_unit --> "in".
1649		svg_unit --> "mm".
1650		svg_unit --> "pc".
1651		svg_unit --> "pt".
1652		svg_unit --> "px".
1653		svg_unit --> "deg". % angle units
1654		svg_unit --> "grad".
1655		svg_unit --> "rad".
1656		svg_unit --> "turn".
1657		svg_unit --> "rem". % root em
1658		svg_unit --> "vh". % viewport height unit (1%)
1659		svg_unit --> "vw". % viewport width unit (1%)
1660		svg_unit --> "vmin". % min ov vh, vw
1661		svg_unit --> "vmax". % max ov vh, vw
1662
1663
1664		optws --> " ",!,optws.
1665		optws --> [].
1666
1667		digit(X) :- X >= 48, X =< 57.
1668
1669		is_svg_number_attribute(Attr) :- is_svg_number_attribute(Attr,_).
1670
1671
1672		:- use_module(probsrc(tools_matching), [dot2svg_synonym/2, is_dot_attribute/1]).
1673		% some checks to see whether the attribute is supported by the given SVG class
1674
1675		check_attribute_is_supported(SVG_Class,DefPos,svg_attribute(Name,_)) :- nonvar(SVG_Class),
1676		check_is_number_attribute(Name,SVG_Class,DefPos),!.
1677		% TODO: check color and other attributes, see also check_attribute_type
1678		check_attribute_is_supported(SVG_Class,DefPos,svg_attribute(Name,_V)) :- !,
1679		check_attribute_name_is_supported(SVG_Class,Name,DefPos).
1680		check_attribute_is_supported(S,DefPos,F) :-
1681		add_internal_error('Illegal call:',check_attribute_is_supported(S,DefPos,F)).
1682
1683
1684		check_attribute_name_is_supported(SVG_Class,Name,DefPos) :-
1685		nonvar(SVG_Class),
1686		is_html_tag(SVG_Class),
1687		\+ is_svg_shape_class(SVG_Class), % script and title can be both SVG and HTML
1688		!,
1689		(is_html_attribute(Name)
1690		-> true % TODO: we could check whether attribute appropriate for Tag
1691		; is_virtual_svg_attribute(Name) -> true % Virtual VisB attribute like children, text, ...
1692		; ajoin(['Unknown HTML attribute used inside HTML tag ',SVG_Class,': '],Msg),
1693		add_message(visb_visualiser,Msg,Name,DefPos)
1694		).
1695		check_attribute_name_is_supported(_SVG_Class,Name,DefPos) :-
1696		\+ is_svg_attribute(Name),
1697		!,
1698		(dot2svg_synonym(Name,GraphVizTranslName)
1699		-> ajoin(['Unknown SVG attribute (maybe you want to use ',GraphVizTranslName,' ?): '],Msg),
1700		add_warning(visb_visualiser,Msg,Name,DefPos)
1701		; get_all_svg_attributes(Attrs),
1702		(get_possible_fuzzy_matches_and_completions_msg(Name,Attrs,FMsg)
1703		-> ajoin(['Unknown SVG attribute (did you mean ',FMsg,' ?): '],Msg),
1704		add_warning(visb_visualiser,Msg,Name,DefPos) % create warning, as it is likely we have made an error
1705		; is_dot_attribute(Name)
1706		-> add_warning(visb_visualiser,'This Dot/Graphviz attribute is not a valid SVG attribute: ',Name,DefPos)
1707		; add_message(visb_visualiser,'Unknown SVG attribute: ',Name,DefPos)
1708		)
1709		).
1710		check_attribute_name_is_supported(_,_,_).
1711
1712		% succeed if attribute is a number attribute and perform a check the attribute is supported by the class
1713		check_is_number_attribute(Attr,Class,Pos) :-
1714		is_svg_number_attribute(Attr,ClassList),
1715		(nonvar(Class), nonmember(Class,ClassList)
1716		-> (equivalent_attribute(Attr,List2,NewAttr), member(Class,List2)
1717		-> ajoin(['The number attribute ',Attr,' is not supported for SVG class ',Class,', use: '],Msg),
1718		add_warning(visb_visualiser,Msg,NewAttr,Pos)
1719		; ajoin(['The number attribute ',Attr,' is not supported for this SVG class: '],Msg),
1720		add_warning(visb_visualiser,Msg,Class,Pos)
1721		)
1722		; true
1723		).
1724
1725		% optionally rewrite record field to alternative spelling
1726		opt_rewrite_field_name(Name,Res) :-
1727		(alternative_spelling(Name,Alt) -> Res=Alt ; Res=Name).
1728
1729		% these alternatives are useful e.g. in TLA+ without backquote:
1730		alternative_spelling(colour,'color').
1731		alternative_spelling(fill_opacity,'fill-opacity').
1732		alternative_spelling(fill_rule,'fill-rule').
1733		alternative_spelling(font_family,'font-family').
1734		alternative_spelling(font_size,'font-size').
1735		alternative_spelling(font_style,'font-style').
1736		alternative_spelling(font_variant,'font-variant').
1737		alternative_spelling(font_weight,'font-weight').
1738		alternative_spelling(marker_end,'marker-end').
1739		alternative_spelling(marker_start,'marker-start').
1740		alternative_spelling(stroke_opacity,'stroke-opacity').
1741		alternative_spelling(stroke_dasharray,'stroke-dasharray').
1742		%alternative_spelling('stroke-dash-array','stroke-dasharray').
1743		alternative_spelling(stroke_linecap,'stroke-linecap').
1744		alternative_spelling(stroke_linejoin,'stroke-linejoin').
1745		alternative_spelling(stroke_width,'stroke-width').
1746
1747
1748
1749		% used to suggest fixing unsupported attributes in SVG objects:
1750		equivalent_attribute(cx,[rect],x).
1751		equivalent_attribute(cy,[rect],y).
1752		equivalent_attribute(x,[circle,ellipse],cx).
1753		equivalent_attribute(x,[line],x1).
1754		equivalent_attribute(y,[circle,ellipse],cy).
1755		equivalent_attribute(y,[line],y1).
1756		equivalent_attribute(r,[rect],rx). % ry also exists
1757		equivalent_attribute(rx,[circle],r).
1758		equivalent_attribute(width,[circle],r).
1759		equivalent_attribute(width,[ellipse],rx).
1760		equivalent_attribute(height,[ellipse],ry).
1761
1762
1763
1764
1765		% ----------------
1766
1767		% parse and load an individual JSON VisB item, e.g, :
1768		% {
1769		% "id":"train_info_text",
1770		% "attr":"x",
1771		% "value":"real(train_rear_end)*100.0/real(TrackElementNumber+1)",
1772		% "comment":"move info field above train"
1773		% },
1774		process_visb_json_item(File,Json) :-
1775		process_repeat(0,Json,File,add_visb_json_item).
1776
1777		add_visb_json_item(File,json(List)) :-
1778		get_attr_true(ignore,List,File), % ignore this item
1779		!.
1780		add_visb_json_item(File,json(List)) :-
1781		del_attr_with_pos(id,List,string(ID),L1,File,PosStartOfItem),
1782		!,
1783		process_visb_json_item_id(File,L1,ID,PosStartOfItem).
1784		add_visb_json_item(File,Json) :-
1785		!,
1786		get_pos_from_list(Json,File,Pos),
1787		add_error(visb_visualiser,'VisB Item has no id attribute:',Json,Pos).
1788
1789		process_visb_json_item_id(File,L1,ID,PosStartOfItem) :-
1790		del_attr(attr,L1,string(Attr),L2), % VisB has attr and value infos
1791		force_del_attr_with_pos(value,L2,string(Formula),L3,File,PosFormula),
1792		!,
1793		(del_attr(comment,L3,string(Desc),L4) -> true ; Desc = '',L4=L3),
1794		debug_format(19,' Processing id:~w attr:~w : value:~w desc:~w~n',[ID,Attr,Formula,Desc]),
1795		actually_add_visb_json_item(ID,Attr,Formula,Desc,L4,PosStartOfItem,PosFormula,File).
1796		process_visb_json_item_id(File,L1,ID,PosStartOfItem) :-
1797		get_attr(SomeSVGAttr,L1,_V),
1798		is_svg_attribute(SomeSVGAttr),
1799		debug_format(19,'Detected new style VisB JSON declaration with id:~w and SVG attr:~w~n',[ID,SomeSVGAttr]),
1800		!,
1801		% object is in new format with multiple attributes "x":"0" rather than "attr":"x", "value":"0"
1802		(del_attr(comment,L1,string(Desc),L2) -> true ; Desc = '',L2=L1),
1803		(non_det_del_attr_with_pos(SVGATTR,L2,string(Formula),L3,File,PosFormula),
1804		is_visb_item_svg_attribute(PosFormula,SVGATTR,Formula),
1805		debug_format(19,' -> Processing new style id:~w attr:~w : value:~w desc:~n',[ID,SVGATTR,Formula,Desc]),
1806		actually_add_visb_json_item(ID,SVGATTR,Formula,Desc,L3,PosStartOfItem,PosFormula,File),
1807		fail
1808		;
1809		true).
1810		process_visb_json_item_id(_File,_JsonList,ID,PosStartOfItem) :-
1811		!,
1812		add_error(visb_visualiser,'Illegal VisB Item without attr and value fields:',ID,PosStartOfItem).
1813
1814		is_visb_item_svg_attribute(Pos,Attr,Val) :-
1815		Attr \= override, % so we ignore a possible override attribute
1816		(is_svg_attribute(Attr) -> true
1817		; add_warning(visb_visualiser,'Ignoring unknown attribute: ',Attr=Val,Pos),
1818		fail
1819		).
1820
1821		:- use_module(probsrc(tools_strings),[safe_name/2]).
1822		actually_add_visb_json_item(ID,Attr,Formula,Desc,JsonList,PosStartOfItem,PosFormula,File) :-
1823		set_error_context(visb_error_context(item,ID,Attr,PosFormula)),
1824		atom_codes(Formula,FormulaC),
1825		(parse_expr_for_visb(FormulaC,JsonList,PosFormula,TypedExpr)
1826		% TO DO: if optional attribute present: avoid generating errors in b_parse_machine_expression_from_codes
1827		-> assert_visb_item(ID,Attr,TypedExpr,Desc,PosStartOfItem,JsonList,File)
1828		; get_attr_with_pos(optional,JsonList,_,File,Pos)
1829		-> formatsilent('Ignoring optional VisB item for ~w (lines ~w) due to error in B formula~n',[ID,Pos])
1830		; ajoin(['Cannot parse or typecheck VisB formula for ',ID,' and attribute ',Attr,':'],Msg),
1831		add_error(visb_visualiser,Msg,Formula,PosFormula)
1832		), clear_error_context.
1833
1834
1835		:- use_module(probsrc(bsyntaxtree), [find_identifier_uses/3]).
1836		% assert a VISB item (aka VISB_SVG_UPDATE)
1837		assert_visb_item(ID,Attr,_TypedExpr,_Desc,PosStartOfItem,_,_) :-
1838		visb_item(ID,Attr,_,_,_,Pos2,Meta2),
1839		!,
1840		get_file_name_msg(PosStartOfItem,From1,File1),
1841		(member(override,Meta2)
1842		-> ajoin(['Overriding VisB item',From1,File1,' for same SVG ID ',ID,' and attribute '],Msg),
1843		add_debug_message(visb_visualiser,Msg,Attr,Pos2)
1844		; ajoin(['Overriding VisB item',From1,File1,' for same SVG ID ',ID,
1845		'. Add an \"override\" attribute to remove this warning. Overriden attribute '],Msg),
1846		add_warning(visb_visualiser,Msg,Attr,Pos2),
1847		% error_context already includes attribute and ID
1848		add_message(visb_visualiser,'Overriding this stored formula for ',ID,PosStartOfItem) % provide detailed info
1849		).
1850		assert_visb_item(ID,Attr,_TypedExpr,_Desc,PosStartOfItem,_JsonList,_File) :-
1851		illegal_attribute_for_visb_item(ID,Attr),!,
1852		add_warning(visb_visualiser,'This attribute cannot be modified in a VisB item: ',Attr,PosStartOfItem).
1853		assert_visb_item(ID,Attr,TypedExpr,Desc,PosStartOfItem,JsonList,File) :-
1854		(get_attr_true(override,JsonList,File) -> Meta = [override] ; Meta=[]),
1855		% determine_type_of_visb_formula(TypedExpr,_,Class) now does take definitions into account; TODO: save info
1856		find_identifier_uses(TypedExpr,[],UsedIds),
1857		assertz(visb_item(ID,Attr,TypedExpr,UsedIds,Desc,PosStartOfItem,Meta)).
1858
1859		illegal_attribute_for_visb_item(_,children).
1860		illegal_attribute_for_visb_item(_,group_id).
1861		illegal_attribute_for_visb_item(_,id).
1862		illegal_attribute_for_visb_item(_,svg_class).
1863
1864
1865		get_file_name_msg(Pos1,' from ',File1) :- extract_tail_file_name(Pos1,File1),!.
1866		get_file_name_msg(_,'',''). % no file info
1867
1868		% ----
1869
1870		get_attr_true(Attr,JsonList,File) :-
1871		get_attr_with_pos(Attr,JsonList,TRUE,File,Pos),
1872		(json_true_value(TRUE) -> true
1873		; json_false_value(TRUE) -> fail
1874		; ajoin(['Value for attribute ',Attr,' is not true or false: '],Msg),
1875		add_warning(visb_visualiser,Msg,TRUE,Pos)
1876		).
1877
1878		json_true_value(@(true)).
1879		json_true_value(string(true)).
1880		json_true_value(number(1)).
1881
1882		json_false_value(@(false)).
1883		json_false_value(string(false)).
1884		json_false_value(number(0)).
1885
1886		% ----------------
1887		% FOR-LOOP / REPEAT processing
1888
1889		%process_repeat(RepCounter, Json, FinalCall to be executed repeatedly for each instance with File and Json, File)
1890		% RepCounter tells us which of %0, %1, ... should be replaced next
1891
1892		process_repeat(RepCount,json(JsonList),File,FinalCall) :-
1893		non_det_del_attr_with_pos(FOR_REP,JsonList,Value,RestJsonList,File,ForRepPos),
1894		% find first for or repeat and process it
1895		(FOR_REP=for ; FOR_REP=repeat),
1896		!,
1897		process_first_repeat(FOR_REP,Value,ForRepPos,RepCount,json(RestJsonList),File,FinalCall).
1898		process_repeat(_RepCount,Json,File,FinalCall) :-
1899		% we have processed all for/repeat loops: now perform the final call on the transformed codes
1900		call(FinalCall,File,Json).
1901
1902		process_first_repeat(for,json(ForList),ForPos,RepCount,JsonData,File,FinalCall) :-
1903		!, % we have a for loop like "for": {"from":1, "to":4}
1904		force_get_attr_nr(from,ForList,From,File),
1905		force_get_attr_nr(to,ForList,To,File),
1906		(get_attr_with_pos(step,ForList,StepAttrVal,File,StepPos),
1907		get_number_value(StepAttrVal,Step,step,StepPos)
1908		-> true % there is an explicit step attribute
1909		; Step=1),
1910		debug_format(19,' -> Iterating %~w from ~w to ~w with step ~w~n',[RepCount,From,To,Step]),
1911		R1 is RepCount+1,
1912		number_codes(RepCount,Pat),
1913		check_between(From,To,Step,ForPos), % check whether step value makes sense
1914		( between(From,To,Step,IterElem),
1915		number_codes(IterElem,IterElemC), % we will replace the text %Pat by the text of the number IterElem
1916		replace_in_json(Pat,IterElemC,JsonData,ReplacedJsonData), % replace within other for/repeat loops, but also other attributes
1917		process_repeat(R1,ReplacedJsonData,File,FinalCall), % now process next loop or finish
1918		fail
1919		; true).
1920		process_first_repeat(repeat,array(RepList),RepPos,RepCount,JsonData,File,FinalCall) :-
1921		!, % we have a repetition like "repeat": ["tr1","tr2"] or "repeat": [ ["1","2"] , ...]
1922		(RepList=[array(L1)|_], length(L1,Len)
1923		-> NewRepCount is RepCount+Len, % we have a multi-repeat with list of values to be replaced
1924		LastRepCount is NewRepCount-1,
1925		debug_format(19,' -> Iterating repeat (%~w,...,%~w) over ~w~n',[RepCount,LastRepCount,RepList]),
1926		check_all_same_length_json(RepList,Len,RepPos)
1927		; NewRepCount is RepCount+1, % next replacement starts at $(RepCount+1)
1928		debug_format(19,' -> Iterating repeat (%~w) over ~w~n',[RepCount,RepList])
1929		),
1930		( member(IterElem,RepList),
1931		multi_replace_in_json(IterElem,RepCount,JsonData,ReplacedJsonData), % replace within other for/repeat loops, but also other attributes
1932		process_repeat(NewRepCount,ReplacedJsonData,File,FinalCall), % now process next loop or finish
1933		fail
1934		; true).
1935
1936		check_all_same_length_json(List,ExpectedLen,Pos) :-
1937		nth1(Nr,List,Json),
1938		(Json=array(SubList),length(SubList,Len) -> Len \= ExpectedLen ; Len='not a list'),
1939		!,
1940		ajoin(['The element number ',Nr,' of the repeat list has not the expected length of ',ExpectedLen,', length is: '],Msg),
1941		add_warning(visb_visualiser,Msg,Len,Pos).
1942		check_all_same_length_json(_,_,_).
1943
1944		json_value_to_codes(@(Literal), C) :- atom(Literal), !, atom_codes(Literal, C).
1945		json_value_to_codes(number(Number), C) :- number(Number), !, number_codes(Number, C).
1946		json_value_to_codes(string(String), C) :- atom(String), !, atom_codes(String, C).
1947		json_value_to_codes(Json, _) :- !, add_error(json_value_to_codes,'Cannot convert json term to codes:', Json), fail.
1948
1949		% replace (possibly) multiple patterns at once
1950		multi_replace_in_json(array([]),_RepCount,JsonIn,JsonOut) :- !, JsonOut=JsonIn.
1951		multi_replace_in_json(array([IterElem|TIT]),RepCount,JsonIn,JsonOut) :-
1952		!,
1953		number_codes(RepCount,Pat),
1954		json_value_to_codes(IterElem,IterElemC),
1955		%format('Replacing in JSON: ~s -> ~s~n',[Pat,IterElemC]),
1956		replace_in_json(Pat,IterElemC,JsonIn,Json),
1957		R1 is RepCount+1,
1958		multi_replace_in_json(array(TIT),R1,Json,JsonOut).
1959		multi_replace_in_json(IterElem,RepCount,JsonIn,JsonOut) :- % a value, not a list
1960		!,
1961		number_codes(RepCount,Pat),
1962		json_value_to_codes(IterElem,IterElemC),
1963		%format('Replacing in JSON: ~s -> ~s~n',[Pat,IterElemC]),
1964		replace_in_json(Pat,IterElemC,JsonIn,JsonOut).
1965
1966		check_between(_,_,Step,ForPos) :- Step =< 0, !,
1967		add_error(visb_visualiser,'The step of a for loop must be positive:',Step,ForPos),fail.
1968		check_between(From,To,Step,ForPos) :- Iters is (To-From)/Step,
1969		Iters > 100000,!,
1970		add_error(visb_visualiser,'Very large for loop:',Iters,ForPos),fail.
1971		check_between(_,_,_,_).
1972
1973
1974		% ----------------
1975
1976		% parse and load VisB events
1977		% A VisB Event looks like:
1978		% {
1979		% "id": "button",
1980		% "event": "toggle_button",
1981		% "hovers": [{ "attr":"stroke-width", "enter":"6", "leave":"1"},
1982		% { "attr":"opacity", "enter":"0.8", "leave":"1.0"}]
1983		% }
1984		process_json_event(File,Json) :-
1985		process_repeat(0,Json,File,add_visb_json_event).
1986
1987		add_visb_json_event(File,json(List)) :- get_attr_true(ignore,List,File), !. % ignore this item
1988		add_visb_json_event(File,json(List)) :-
1989		get_pos_from_list(List,File,Pos),
1990		force_del_attr(id,List,string(ID),L0,File), % for items it could make sense to not specify an id
1991		(del_attr(event,L0,string(Event),L1) -> true ; Event='', L1=L0),
1992		(del_attr_with_pos(predicates,L1,array(Preds),L2,File,PredPos) -> true
1993		; del_attr_with_pos(preds,L1,array(Preds),L2,File,PredPos) -> true
1994		; Preds=[], L2=L1, PredPos=unknown),
1995		(del_attr(hovers,L2,array(Hovers),L3) -> true ; Hovers=[],L3=L2),
1996		(del_attr(items,L3,array(EI),L4)
1997		-> (empty_b_event(Event)
1998		-> EnableItems=[],
1999		add_warning(visb_visualiser,'Ignoring enable items; you need to provide an event name:',ID,Pos)
2000		; EnableItems=EI)
2001		; EnableItems=[],L4=L3),
2002		debug_format(19,' Processing id:~w event:~w preds:~w enable:~w hovers:~w~n',[ID,Event,Preds,EnableItems,Hovers]),
2003		!,
2004		actually_add_visb_json_event(ID,Event,Preds,Hovers,EnableItems,L4,File,Pos,PredPos).
2005		add_visb_json_event(File,Json) :-
2006		!,
2007		get_pos_from_list(Json,File,Pos),
2008		add_error(visb_visualiser,'Illegal VisB Event:',Json,Pos).
2009
2010		actually_add_visb_json_event(ID,Event,JsonPreds,JsonHovers,JsonEnableItems,JsonList,File,Pos,PredPos) :-
2011		check_additional_args(JsonList,File),
2012		maplist(process_json_pred,JsonPreds,Preds),
2013		maplist(process_json_enabling_item(ID,Event,File),JsonEnableItems,EnableItems),
2014		maplist(process_json_hover(ID,File),JsonHovers,Hovers),
2015		add_visb_event(ID,Event,Preds,Hovers,EnableItems,File,Pos,PredPos,JsonList).
2016
2017		:- use_module(probsrc(tools_strings), [atom_prefix/2]).
2018		:- use_module(probsrc(bmachine), [b_is_operation_name/1]).
2019		add_visb_event(ID,Event,Preds,Hovers,EnableItems,File,Pos,PredPos,JsonList) :-
2020		(retract(visb_event(ID,OldEvent,OldPreds,OldTypedPred,OldFile,OldPos))
2021		-> (get_attr_true(override,JsonList,File)
2022		-> ajoin(['Overriding VisB event from file ',OldFile,' for ID: '],Msg),
2023		add_debug_message(visb_visualiser,Msg,ID,Pos),
2024		retractall(visb_hover(ID,_,_,_,_,_))
2025		; (OldFile=File
2026		-> ajoin(['No override attribute: adding VisB event ',Event,
2027		' (first event ',OldEvent,') for ID: '],Msg)
2028		; ajoin(['No override attribute: adding VisB event ',Event,
2029		' (first event ',OldEvent,' in file ',OldFile,') for ID: '],Msg)
2030		),
2031		add_debug_message(visb_visualiser,Msg,ID,Pos),
2032		assertz(auxiliary_visb_event(ID,OldEvent,OldPreds,OldTypedPred,OldPos))
2033		),
2034		assert_visb_event(ID,Event,Preds,Hovers,EnableItems,File,Pos,PredPos)
2035		% ProB2-UI cannot currently support multiple events associated with the same id
2036		% TODO: merge visb_events if we have no override attribute
2037		; (xtl_mode ; b_is_operation_name_or_external_subst(Event)) ->
2038		assert_visb_event(ID,Event,Preds,Hovers,EnableItems,File,Pos,PredPos)
2039		; (empty_b_event(Event) ; \+ b_or_z_mode)
2040		-> % for empty event we just want hovers
2041		(Preds = [] -> true
2042		; add_warning(visb_visualiser,'Ignoring preds for VisB event for SVG ID: ',ID,Pos)
2043		),
2044		assert_visb_event(ID,Event,[],Hovers,EnableItems,File,Pos,PredPos)
2045		; get_attr_with_pos(optional,JsonList,_,File,Pos) ->
2046		formatsilent('Ignoring optional VisB event for ~w (lines ~w) due to unknown B operation ~w~n',[ID,Pos,Event])
2047		; detect_op_call_with_paras(Event,OpName) ->
2048		add_warning(visb_visualiser,'Ignoring parameters provided in event; use predicate attribute to specify parameters: ',Event,Pos),
2049		assert_visb_event(ID,OpName,Preds,Hovers,EnableItems,File,Pos,PredPos)
2050		; atom(Event), atom_prefix('{',Event) ->
2051		ajoin(['Unknown B operation ', Event, ' in VisB for SVG ID (be sure to use events attribute for multiple events): '],Msg),
2052		add_warning(visb_visualiser,Msg,ID,Pos)
2053		; ajoin(['Unknown B operation ', Event, ' in VisB for SVG ID: '],Msg),
2054		add_warning(visb_visualiser,Msg,ID,Pos)
2055		).
2056
2057		b_is_operation_name_or_external_subst(OpName) :- b_is_operation_name(OpName).
2058		b_is_operation_name_or_external_subst(Special) :- special_operation(Special).
2059
2060		% maybe we should provide those via the external substitution interface:
2061		% these are all schedulers which choose among existing enabled operations in some manner
2062		special_operation('MCTS_AUTO_PLAY').
2063		special_operation('RANDOM_ANIMATE').
2064		special_operation('RANDOM_ANIMATE_UNTIL_LTL').
2065		% maybe other special names like random_animate with nr of steps, LTL until, ...
2066		special_operation_enabled('MCTS_AUTO_PLAY',_,_,_) :- mcts_auto_play_available.
2067		special_operation_enabled('RANDOM_ANIMATE',_,_,_). % TODO: check if a transition exists
2068		special_operation_enabled('RANDOM_ANIMATE_UNTIL_LTL',_,_,_).
2069
2070		% detect operation call with parameters
2071		detect_op_call_with_paras(Event,OpName) :- atom(Event),
2072		atom_codes(Event,Codes), parse_op_call_name(OpC,Codes,_),!,
2073		atom_codes(OpName,OpC),
2074		b_is_operation_name(OpName).
2075
2076		parse_op_call_name([X|T]) --> alpha(X), parse_op_call_name2(T).
2077		parse_op_call_name2([]) --> "(".
2078		parse_op_call_name2([H|T]) --> alphadigit(H), parse_op_call_name2(T).
2079
2080		alpha(X) --> [X],{X>=97, X=<122}.
2081		alphadigit(X) --> [X], ({X>=97,X=<122} ; {X>=65, X=<90} ; {X=95} ; {X>=48, X=<57}).
2082
2083		empty_b_event('').
2084
2085		assert_visb_event(ID,Event,Preds,Hovers,EnableItems,File,Pos,PredPos) :-
2086		construct_pre_post_predicate(ID,Event,Preds,TypedPred,PredPos),
2087		assertz(visb_event(ID,Event,Preds,TypedPred,File,Pos)),
2088		% process hovers
2089		(member(HoverElement,Hovers),
2090		(HoverElement=visb_hover(HoverID,Attr,EnterVal,ExitVal) -> true ; add_error(visb_visualiser,'Illegal hover term:',HoverElement),fail),
2091		assert_visb_hover(ID,HoverID,Attr,EnterVal,ExitVal,Pos),fail
2092		; true),
2093		% now process any additional items with disabled and enabled values
2094		assert_visb_enabling_item_list(Event,TypedPred,EnableItems,File,Pos).
2095
2096		process_json_pred(string(P),R) :- !, R=P.
2097		process_json_pred(Json,_) :- !, add_error(visb_visualiser,'Illegal json term for predicate:',Json), fail.
2098
2099		process_json_hover(OriginID,File,json(Hover),visb_hover(ID,Attr,EnterVal,LeaveVal)) :-
2100		force_del_attr(attr,Hover,string(Attr),H2,File),
2101		force_del_attr_with_pos(enter,H2,EV,H3,File,EnterPos),
2102		force_del_attr_with_pos(leave,H3,LV,H4,File,ExitPos),
2103		(is_svg_number_attribute(Attr) % we evaluate number attributes
2104		-> get_number_value(EV,EnterVal,Attr,EnterPos),
2105		get_number_value(LV,LeaveVal,Attr,ExitPos)
2106		; string(EnterVal)=EV, string(LeaveVal)=LV % return string as is; TODO: also evaluate other attributes
2107		),
2108		(get_attr(id,H4,string(ID)) -> true ; ID=OriginID).
2109
2110
2111		assert_visb_hover(TriggerID,SVG_ID,Attr,EnterVal,ExitVal,Pos) :-
2112		assert(visb_hover(TriggerID,SVG_ID,Attr,EnterVal,ExitVal,Pos)),
2113		(visb_has_hovers(TriggerID) -> true ; assert(visb_has_hovers(TriggerID))),
2114		(visb_has_visibility_hover(SVG_ID) -> true
2115		; Attr=visibility -> assert(visb_has_visibility_hover(TriggerID)) % object can be made visible by hover
2116		; true),
2117		debug_format(19,'Adding hover for ~w : ~w.~w -> ~w <- ~w~n',[TriggerID,SVG_ID,Attr,EnterVal,ExitVal]).
2118
2119
2120		% process items in event which get translated to enabling/disabling predicates
2121		% "items":[ {"attr":"stroke-width","enabled":"10", "disabled":"1"} ]
2122		process_json_enabling_item(ID,Event,File,json(JsonList),
2123		visb_enable_item(SvgID,Attr,EnabledValExpr,DisabledValExpr,PosAttr)) :-
2124		force_del_attr_with_pos(attr,JsonList,string(Attr),L2,File,PosAttr),
2125		force_del_attr_with_pos('enabled',L2,string(EnVal),L3,File,EPos),
2126		force_del_attr_with_pos('disabled',L3,string(DisVal),L4,File,DPos),
2127		(del_attr(id,L4,string(SvgID),L5) -> true ; SvgID=ID, L4=L5),
2128		atom_codes(EnVal,EC),
2129		parse_expr_for_visb(EC,L5,EPos,EnabledValExpr),
2130		atom_codes(DisVal,DC),
2131		parse_expr_for_visb(DC,L5,DPos,DisabledValExpr),
2132		(debug_mode(off) -> true
2133		; translate_bexpression_with_limit(EnabledValExpr,30,EVS),
2134		translate_bexpression_with_limit(DisabledValExpr,30,DVS),
2135		formatsilent('Enabling item for event ~w and SVG ID ~w and attribute ~w : ~w <-> ~w~n',[Event,SvgID,Attr,EVS,DVS])
2136		).
2137
2138		assert_visb_enabling_item_list(Event,TypedPred,EnableList,File,Pos) :-
2139		maplist(check_enabling_item(Event),EnableList),
2140		(EnableList \= []
2141		-> (debug_mode(off)
2142		-> true
2143		; format('Associating enabling/disabling list with event ~w and predicate: ',[Event]), translate:print_bexpr(TypedPred),nl),
2144		assert(visb_event_enable_list(Event,TypedPred,EnableList,File,Pos))
2145		; true).
2146
2147		check_enabling_item(Event,visb_enable_item(SvgID,Attr,_,_,PosAttr)) :-
2148		(visb_item(SvgID,Attr,_,_,_Desc,DuplicatePos,_)
2149		-> (extract_span_description(DuplicatePos,DuplPos) -> true; DuplPos=DuplicatePos),
2150		ajoin(['VisB conflict for SVG ID ',SvgID,' and attribute ',Attr,
2151		'. Conflict between VisB item (',DuplPos,') and VisB enable/disable entry for event: '],Msg),
2152		add_warning(visb_visualiser,Msg,Event,PosAttr)
2153		; true).
2154
2155		valid_additional_attributes(comment).
2156		valid_additional_attributes(description).
2157		valid_additional_attributes(optional).
2158		valid_additional_attributes(override).
2159
2160		% check if there are additional unprocessed args and generate a warning
2161		check_additional_args(JsonList,File) :-
2162		get_attr_with_pos(Attr,JsonList,_,File,Pos),
2163		\+ valid_additional_attributes(Attr),
2164		add_warning(visb_visualiser,'Ignoring unknown JSON field: ',Attr,Pos),
2165		fail.
2166		check_additional_args(_,_).
2167
2168		:- use_module(probsrc(bsyntaxtree), [conjunct_predicates/2]).
2169		% construct a pre-post typed predicate for a VisB Event
2170		construct_pre_post_predicate(SvgID,OpName,Preds,TypedPred,Pos) :-
2171		set_error_context(visb_error_context(event,SvgID,OpName,Pos)),
2172		maplist(construct_pre_post_pred(OpName,Pos),Preds,TL),
2173		clear_error_context,
2174		conjunct_predicates(TL,TypedPred).
2175
2176		:- use_module(probsrc(bmachine), [b_parse_machine_operation_pre_post_predicate/5]).
2177		construct_pre_post_pred(OpName,Pos,PredStr,TypedPred) :- empty_b_event(OpName),!,
2178		add_error(visb_visualiser,'Cannot parse VisB event predicate without event name:',PredStr,Pos),
2179		TypedPred = b(truth,pred,[]).
2180		construct_pre_post_pred(OpName,Pos,String,TypedExpr) :- special_operation(OpName),!,
2181		% we have a special operation; allow to provide an expression with options/parameters
2182		atom_codes(String,Codes),
2183		GenParseErrors=gen_parse_errors_for(Pos),
2184		parse_expr(Codes,TypedExpr,GenParseErrors). % TODO: should we require a predicate instead, and provide arg names?
2185		construct_pre_post_pred(OpName,Pos,String,TypedPred) :-
2186		atom_codes(String,Codes), replace_special_patterns(Codes,RCodes,Pos), %format("Replaced : ~S~n",[RCodes]),
2187		get_visb_extra_scope([identifier(VisBExtraScope)]),
2188		visb_click_meta_b_type(MetaRecType),
2189		ExtraScope = [identifier([b(identifier('VISB_CLICK_META_INFOS'),MetaRecType,[visb_generated])|VisBExtraScope])],
2190		(b_parse_machine_operation_pre_post_predicate(RCodes,ExtraScope,TypedPred,OpName,gen_parse_errors_for(Pos))
2191		-> true
2192		; add_error(visb_visualiser,'Error for VisB event predicate:',String,Pos),
2193		TypedPred = b(truth,pred,[])
2194		).
2195
2196		% replace special patterns by dummy values to avoid error messages in ProB2-UI
2197		replace_special_patterns([],[],_Pos) :- !.
2198		replace_special_patterns([37|T],Res,Pos) :- !, % percentage sign %
2199		replace_aux(T,Res,Pos).
2200		replace_special_patterns([H|T],[H|RT],Pos) :- !, replace_special_patterns(T,RT,Pos).
2201
2202		replace_aux(Input,Res,Pos) :-
2203		replace_pat(PAT,Replacement),
2204		append(PAT,T,Input),
2205		!,
2206		atom_codes(PatAtom,PAT),
2207		ajoin(['The %',PatAtom,' pattern is obsolete. Please use VISB_CLICK_META_INFOS\'',PatAtom,' instead.'],Msg),
2208		add_warning(visb_visualiser,Msg,'',Pos),
2209		append(Replacement,ResT,Res),
2210		replace_special_patterns(T,ResT,Pos).
2211		replace_aux(Input,[37|Res],Pos) :- !, replace_special_patterns(Input,Res,Pos).
2212
2213		replace_pat("shiftKey","VISB_CLICK_META_INFOS'shiftKey").
2214		replace_pat("metaKey","VISB_CLICK_META_INFOS'metaKey").
2215		replace_pat("pageX","VISB_CLICK_META_INFOS'pageX").
2216		replace_pat("pageY","VISB_CLICK_META_INFOS'pageY").
2217
2218
2219
2220		% small utils:
2221		% ----------------
2222
2223		% a variation of between/3 with a step argument
2224		between(From,To,_,_) :- From > To, !,fail.
2225		between(From,_,_,From).
2226		between(From,To,Step,Elem) :- F1 is From+Step, between(F1,To,Step,Elem).
2227
2228		:- use_module(probsrc(tools_strings),[is_simple_classical_b_identifier_codes/1]).
2229		:- use_module(probsrc(preferences), [reset_temporary_preference/2,temporary_set_preference/3]).
2230		parse_expr(ExprCodes,TypedExpr,_GenParseErrors) :-
2231		is_simple_classical_b_identifier_codes(ExprCodes),
2232		atom_codes(DefID,ExprCodes),
2233		visb_definition(DefID,Type,_DefFormula,Class,_VPos,_),
2234		!,
2235		TypedExpr = b(identifier(DefID),Type,[type_of_formula(Class)]).
2236		parse_expr(ExprCodes,TypedExpr,GenParseErrors) :-
2237		temporary_set_preference(allow_arith_operators_on_reals,true,CHNG),
2238		get_visb_extra_scope(ExtraScope),
2239		% formatsilent('Parsing: ~s (extra ids: ~w)~n',[ExprCodes,ExtraScope]), start_ms_timer(T1),
2240		call_cleanup(bmachine:b_parse_machine_expression_from_codes_with_prob_ids(ExprCodes,ExtraScope,TypedExpr,
2241		GenParseErrors),
2242		reset_temporary_preference(allow_arith_operators_on_reals,CHNG)).
2243		%stop_ms_walltimer_with_msg(T1,'parsing: ').
2244		% TODO: we could share a machine parameter M like in prob2_interface
2245		% so that b_type_expression_for_full_b_machine will load machine only once
2246		% cf b_type_open_predicate_for_full_b_machine
2247
2248		determine_type_of_visb_formula(b(_,_,[type_of_formula(Class)]),all,Res) :- !,
2249		Res = Class. % generated by VisB, TODO: store UsedTIds in type_of_formula(.)
2250		determine_type_of_visb_formula(TypedExpr,TIds,Class) :-
2251		determine_type_of_formula_with_visb_defs(TypedExpr,TIds,Class).
2252
2253		%check for used_ids inside TypedExpr an see what type of visb_definition are used
2254		determine_type_of_formula_with_visb_defs(TypedExpr,TIds,ResClass) :-
2255		determine_type_of_formula(TypedExpr,TIds,Class1), % compute class w/o knowledge of VisB definitions
2256		(class_more_general_than(Class2,Class1),
2257		required_by_visb_def(TIds,Class2) -> Class=Class2
2258		; Class=Class1),
2259		(Class=requires_variables -> ResClass=Class
2260		; expression_requires_state(TypedExpr) -> ResClass = requires_variables
2261		; ResClass=Class).
2262
2263		:- use_module(probsrc(bsyntaxtree),[map_over_bexpr/2]).
2264		:- use_module(probsrc(external_functions),[external_function_requires_state/1]).
2265		expression_requires_state(TypedExpr) :-
2266		(map_over_bexpr(sub_expression_requires_state,TypedExpr) -> true ; fail).
2267		% TODO: should we also check is_not_declarative/1 ? e.g., for RANDOM or CHANGED
2268		sub_expression_requires_state(external_pred_call(P,_)) :- external_function_requires_state(P).
2269		sub_expression_requires_state(external_function_call(P,_)) :- external_function_requires_state(P).
2270
2271
2272		class_more_general_than(requires_variables,requires_nothing).
2273		class_more_general_than(requires_variables,requires_constants).
2274		class_more_general_than(requires_constants,requires_nothing).
2275
2276		required_by_visb_def(TIds,Class) :-
2277		member(TID,TIds), get_texpr_id(TID,ID),visb_definition(ID,_,_,Class,_,_).
2278
2279
2280		get_visb_extra_scope([identifier(ExtraIDs)]) :-
2281		get_visb_extra_identifiers(ExtraIDs).
2282		get_visb_extra_identifiers(ExtraIDs) :-
2283		findall(b(identifier(ID),Type,[visb_generated]),visb_definition(ID,Type,_,_,_,_),ExtraIDs).
2284
2285		% replace a pattern code prefixed by % by another code list
2286		replace_in_json(Pattern,RepStr,string(Val),string(NewVal)) :- !, replace_atom(Pattern,RepStr,Val,NewVal).
2287		replace_in_json(Pattern,RepStr,array(Vals),array(NewVals)) :- !, maplist(replace_in_json(Pattern,RepStr),Vals,NewVals).
2288		replace_in_json(Pattern,RepStr,json(Vals),json(NewVals)) :- !, maplist(replace_in_json_pair(Pattern,RepStr),Vals,NewVals).
2289		replace_in_json(_,_,Val,Val). % number/literal (no replacement necessary)
2290
2291		replace_in_json_pair(Pattern,RepStr,'='(KIn,VIn,Pos),'='(KOut,VOut,Pos)) :-
2292		replace_atom(Pattern,RepStr,KIn,KOut),
2293		replace_in_json(Pattern,RepStr,VIn,VOut).
2294
2295		replace_atom(Pattern,RepStr,Val,NewVal) :-
2296		atom_codes(Val,Codes),
2297		replace_pat(Pattern,RepStr,NewCodes,Codes,[]),
2298		atom_codes(NewVal,NewCodes). % TO DO: keep as codes for efficiency
2299
2300		:- assert_must_succeed((visb_visualiser: replace_pat("0","_1_",Res,"ab%0cd",[]), Res == "ab_1_cd")).
2301		:- assert_must_succeed((visb_visualiser: replace_pat("0","",Res,"ab%0%0cd%0",[]), Res == "abcd")).
2302		% dcg utility to replace %Pat by NewStr constructing Res
2303		replace_pat(Pat,NewStr,Res) --> "%", Pat, !, {append(NewStr,TR,Res)}, replace_pat(Pat,NewStr,TR).
2304		replace_pat(Pat,RepStr,[H|T]) --> [H],!, replace_pat(Pat,RepStr,T).
2305		replace_pat(_,_,[]) --> [].
2306
2307
2308		% small JSON utils:
2309		% ----------------
2310
2311		get_attr(Attr,List,Val) :- member('='(Attr,Val,_),List).
2312		get_attr_with_pos(Attr,List,Val,File,Pos) :-
2313		El = '='(Attr,Val,_),
2314		member(El,List),
2315		get_pos_from_list([El],File,Pos).
2316
2317		del_attr(Attr,List,Val,Rest) :- select('='(Attr,Val,_Pos),List,Rest).
2318		%del_attr_with_pos(Attr,List,Val,Rest,Pos) :- select('='(Attr,Val,Pos),List,Rest).
2319		del_attr_with_pos(Attr,List,Val,Rest,File,PosTerm) :- select('='(Attr,Val,From-To),List,Rest),!,
2320		PosTerm = src_position_with_filename_and_ec(From,1,To,1,File).
2321		non_det_del_attr_with_pos(Attr,List,Val,Rest,File,PosTerm) :- select('='(Attr,Val,From-To),List,Rest),
2322		PosTerm = src_position_with_filename_and_ec(From,1,To,1,File).
2323
2324		force_del_attr(Attr,List,Val,Rest,File) :- force_del_attr_with_pos(Attr,List,Val,Rest,File,_).
2325
2326		force_del_attr_with_pos(Attr,List,Val,Rest,File,PosTerm) :- select('='(Attr,Val,From-To),List,Rest),!,
2327		%TODO: we would ideally want to extract the exact column position of Val, for this we need to extend the JSON parser first
2328		PosTerm = src_position_with_filename_and_ec(From,1,To,1,File).
2329		force_del_attr_with_pos(Attr,List,_,_,File,_) :- get_pos_from_list(List,File,Pos),!,
2330		add_error(visb_visualiser,'The JSON object has no attribute:',Attr,Pos),fail.
2331
2332		construct_prob_pos_term(From-To,File,PosTerm) :- !,
2333		PosTerm = src_position_with_filename_and_ec(From,1,To,1,File).
2334		construct_prob_pos_term(Pos,_,Pos).
2335
2336		force_get_attr_nr(Attr,List,Nr,File) :-
2337		force_del_attr_with_pos(Attr,List,AttrVal,_,File,Pos),!,
2338		get_number_value(AttrVal,Nr,Attr,Pos).
2339
2340		get_number_value(AttrVal,Nr,Attr,Pos) :-
2341		(AttrVal = number(Nr) -> true
2342		; AttrVal = string(StrAttrVal),
2343		atom_codes(StrAttrVal,AttrValC),
2344		parse_expr(AttrValC,TypedExpr,gen_parse_errors_for(Pos)),
2345		determine_type_of_visb_formula(TypedExpr,UsedTIds,Class)
2346		% Class = requires_nothing, requires_constants, requires_variables
2347		->
2348		(Class = requires_variables
2349		-> ajoin(['The JSON formula for the attribute"',Attr,
2350		'" must not depend on variables:'],Msg),
2351		add_error(visb_visualiser,Msg,StrAttrVal,Pos),fail
2352		; Class = requires_constants,
2353		\+ is_concrete_constants_state_id(_)
2354		-> ajoin(['The JSON formula for the attribute"',Attr,
2355		'" depends on constants which have not been set up (via SETUP_CONSTANTS):'],Msg),
2356		add_error(visb_visualiser,Msg,StrAttrVal,Pos),fail
2357		; Class = requires_constants,
2358		multiple_concrete_constants_exist,
2359		ajoin(['The JSON formula for the attribute"',Attr,
2360		'" depends on constants and multiple solutions for SETUP_CONSTANTS exist:'],Msg),
2361		add_warning(visb_visualiser,Msg,StrAttrVal,Pos),fail
2362		; get_texpr_type(TypedExpr,Type),
2363		is_number_type(Type)
2364		-> eval_static_def(Class,'VisB attribute',Attr,TypedExpr,UsedTIds,ResVal,Pos),
2365		get_number_from_bvalue(ResVal,Nr)
2366		; get_texpr_type(TypedExpr,Type),
2367		% it could produce a string which is a number; we could try and convert to a number
2368		ajoin(['The type ',Type,' of the JSON value formula for the attribute "',Attr,
2369		'" is not a number:'],Msg),
2370		add_error(visb_visualiser,Msg,StrAttrVal,Pos),fail
2371		)
2372		; ajoin(['The JSON value for the attribute "',Attr,'" cannot be parsed as a number:'],Msg),
2373		add_error(visb_visualiser,Msg,AttrVal,Pos),fail).
2374
2375		is_number_type(integer).
2376		is_number_type(real).
2377		:- use_module(probsrc(kernel_reals),[is_real/2]).
2378		:- use_module(probsrc(custom_explicit_sets),[singleton_set/2]).
2379		get_number_from_bvalue(int(Nr),Res) :- !, Res=Nr.
2380		get_number_from_bvalue(Term,Res) :- is_real(Term,Nr),!,Res=Nr.
2381
2382		get_pos_from_list(json(List),File,Pos) :- !, get_pos_from_list(List,File,Pos).
2383		get_pos_from_list([H|T],File,RPos) :-
2384		H='='(_,_,From-_),
2385		last([H|T],
2386		'='(_,_,_-To)),
2387		!,
2388		RPos=src_position_with_filename_and_ec(From,1,To,1,File).
2389		get_pos_from_list(_,File,File). % should we provide another term?
2390
2391		% ----------------------------------
2392
2393		:- use_module(probsrc(b_global_sets),[add_prob_deferred_set_elements_to_store/3]).
2394		:- use_module(probsrc(tools),[b_string_escape_codes/2]).
2395
2396		% computing updates to SVG for a given StateId:
2397		% predicate to obtain required setAttribute changes to visualise StateId
2398		% looks up visb_item facts but also evaluates VISB_SVG_UPDATE definitions
2399		get_change_attribute_for_state(StateId,SvgID,SvgAttribute,Value) :-
2400		set_error_context(checking_context('VisB:','computing attributes for state')),
2401		get_expanded_bstate(StateId,ExpandedBState),
2402		set_context_state(StateId,get_change_attribute_for_state), % also sets it for external functions
2403		% TODO: also set history so that get_current_history in external_functions is more reliable
2404		call_cleanup(get_change_aux(StateId,ExpandedBState,SvgID,SvgAttribute,Value),
2405		(clear_context_state,clear_error_context)).
2406
2407		get_change_aux(StateId,ExpandedBState,SvgID,SvgAttribute,Value) :-
2408		get_aux2(StateId,ExpandedBState,SvgID0,SvgAttribute0,Value0,DefPos),
2409		post_process_visb_item(SvgID0,SvgAttribute0,Value0,DefPos,SvgID,SvgAttribute,Value).
2410		get_aux2(StateId,ExpandedBState,SvgID,SvgAttribute,Value,DefPos) :-
2411		% first get updates from DEFINITIONS which usually return sets of records
2412		get_svg_object_updates_from_definitions(ExpandedBState,SvgID,SvgAttribute,Value,DefPos),
2413		debug_format(19,' VISB_SVG_UPDATE ~w:~w = ~w (in state ~w)~n',[SvgID,SvgAttribute,Value,StateId]).
2414		get_aux2(StateId,ExpandedBState,SvgID,SvgAttribute,Value,Pos) :-
2415		% TODO: check if visibility item exists, and if value is false: do not compute the rest
2416		get_visb_item_formula(SvgID,SvgAttribute,Formula,Pos,ExpandedBState),
2417		% TODO: if UsedIds=[] only set attribute once, if it requires_only_constants : ditto
2418		evaluate_visb_formula(Formula,'VisB item',SvgID,ExpandedBState,FValue,Pos),
2419		%b_value_to_string(FValue,Value),
2420		extract_attr_value(SvgAttribute,FValue,Value,Pos),
2421		debug_format(19,' VisB item ~w:~w = ~w (in state ~w)~n',[SvgID,SvgAttribute,Value,StateId]).
2422
2423		% post-process certain items, like title to adapt the value and id:
2424		% SVG does not support a title attribute; we need a title child and set its text attribute
2425		post_process_visb_item(SvgID,title,Value,Pos,NewID,text,NewValue) :-
2426		visb_svg_object(SvgID,_SVG_Class,_RestAttrs,_Desc,_Pos1),
2427		(visb_svg_object_debug_info(SvgID,DebugInfo) -> ajoin([Value,'\n',DebugInfo],NewValue) ; NewValue=Value),
2428		(visb_svg_parent(SvgID,TitleID),
2429		visb_svg_object(TitleID,title,_,_,_)
2430		-> NewID=TitleID,
2431		debug_format(9,'Redirecting title update for ~w to child object ~w~n',[SvgID,TitleID])
2432		; add_warning(visb_visualiser,'Could not find title child object, be sure to define a static title attribute for SVG object: ',SvgID,Pos),
2433		fail
2434		),!.
2435		post_process_visb_item(SvgID,Attr,Value,_,SvgID,Attr,Value).
2436
2437		% ------------------
2438
2439		% convert B value to Json String
2440		b_value_to_string(string(SValue),Res) :- !, Res=SValue. % What about quoting,...?
2441		b_value_to_string(FValue,Res) :-
2442		translate_bvalue_to_codes(FValue,ValCodes),
2443		atom_codes(Res,ValCodes).
2444
2445		% attributes for which we convert pairs to the concatenation of strings
2446		is_id_or_text_attribute(id).
2447		is_id_or_text_attribute('group_id'). % works much like a parent_id; also can be used to attach animate to e.g. a rect
2448		is_id_or_text_attribute('trigger_id').
2449		is_id_or_text_attribute('trigger-id').
2450		is_id_or_text_attribute(A) :- is_text_attribute(A).
2451		% children
2452		is_text_attribute('text').
2453		is_text_attribute('transform').
2454		is_text_attribute('event'). % for VISB_SVG_EVENTS
2455		is_text_attribute('predicate'). % for VISB_SVG_EVENTS
2456		is_text_attribute('svg_class').
2457
2458
2459		b_value_to_id_string(Val,String) :- b_val_to_id_string_aux(Val,add_underscore,String).
2460		b_value_to_text_string(Val,String) :- b_val_to_id_string_aux(Val,no_underscore,String).
2461
2462		% a special string conversion which e.g., allows to use things like ("ab",2) as id which gets translated to ab2
2463		% also useful for text attributes
2464		b_val_to_id_string_aux(string(SValue),_,Res) :- !, Res=SValue.
2465		b_val_to_id_string_aux((A,B),Add,Res) :- !,
2466		b_val_to_id_string_aux(A,Add,VA), b_val_to_id_string_aux(B,Add,VB),
2467		(Add=add_underscore
2468		-> atom_concat('_',VB,VB1) % introduce separator; in case we have things like numbers so that (12,3) /= (1,23)
2469		; VB1=VB % for fields like predicate, transform, ... we do not want additional underscores
2470		),
2471		atom_concat(VA,VB1,Res).
2472		b_val_to_id_string_aux(Set,Add,Res) :- singleton_set(Set,El),!, b_val_to_id_string_aux(El,Add,Res).
2473		% TODO: maybe convert sequence of values using conc
2474		b_val_to_id_string_aux(FValue,_,Res) :-
2475		translate_bvalue_to_codes(FValue,ValCodes),
2476		atom_codes(Res,ValCodes).
2477
2478		% get either a regular VisB item or an item associated with a VisB event and its enabled status
2479		get_visb_item_formula(SvgID,SvgAttribute,Formula,Pos,_ExpandedBState) :-
2480		visb_item(SvgID,SvgAttribute,Formula,_UsedIds,_Desc,Pos,_). % regular VisB item
2481		get_visb_item_formula(SvgID,SvgAttribute,Formula,Pos,ExpandedBState) :- % item within VisB event
2482		visb_event_enable_list(OpName,TypedPred,EnableList,_,ItemPos),
2483		debug_format(19,'Checking enabledness of VisB event ~w~n',[OpName]),
2484		(check_enabled(OpName,TypedPred,ExpandedBState,ItemPos)
2485		-> Formula=EnabledValExpr
2486		; Formula=DisabledValExpr
2487		),
2488		member(visb_enable_item(SvgID,SvgAttribute,EnabledValExpr,DisabledValExpr,Pos), EnableList).
2489
2490		check_enabled(OpName,Pred,ExpandedBState,Pos) :-
2491		special_operation(OpName),!,
2492		special_operation_enabled(OpName,Pred,ExpandedBState,Pos).
2493		check_enabled(OpName,Pred,ExpandedBState,Pos) :-
2494		b_is_operation_name(OpName),
2495		% TODO: see if we can use GUARD without execution
2496		% TODO: not yet working for XTL mode
2497		execute_operation_by_predicate_in_state_with_pos(ExpandedBState,OpName,Pred,_OpTerm,_NewState,Pos).
2498
2499
2500		get_expanded_bstate(StateId,ExpandedBState) :-
2501		\+ b_or_z_mode,!,
2502		StateId \= root,
2503		% in XTL mode we need to access the state via external functions like STATE_PROPERTY
2504		get_static_visb_state([],ExpandedBState).
2505		get_expanded_bstate(StateId,ExpandedBState) :-
2506		visited_expression(StateId,State),
2507		state_corresponds_to_initialised_b_machine(State,BState),
2508		debug_format(19,'Adding VisB definitions to state: ~w~n',[StateId]),
2509		add_prob_deferred_set_elements_to_store(BState,BState2,visible), % add prob_ids
2510		findall(visb_definition(DefID,Type,DefFormula,Class,VPos,Special),
2511		visb_definition(DefID,Type,DefFormula,Class,VPos,Special),DefList),
2512		eval_defs(DefList,BState2,ExpandedBState).
2513
2514
2515		:- use_module(probsrc(b_interpreter), [ b_compute_expression_nowf/7,b_compute_explicit_epression_no_wf/7]).
2516
2517		evaluate_static_visb_formula(Formula,Kind,Nr,InState,ResValue,Pos) :-
2518		get_static_visb_state(InState,StaticState),
2519		evaluate_visb_formula(Formula,Kind,Nr,StaticState,ResValue,Pos).
2520
2521		evaluate_visb_formula(Formula,Kind,Nr,BState2,ResValue,Pos) :-
2522		% add_message(visb,'Evaluating: ',Kind:Nr,Pos), debug:nl_time, %set_prolog_flag(profiling,on), print_profile,
2523		(b_compute_explicit_epression_no_wf(Formula,[],BState2,ResValue,Kind,Nr,Pos) -> true
2524		; add_error(visb_visualiser,'Evaluation of VisB formula failed:',Formula,Pos),
2525		fail).
2526
2527		% evaluate VisB definitions in order one by one, adding values to state
2528		eval_defs([],State,State).
2529		eval_defs([visb_definition(ID,_,TypedExpr,_Class,VPos,Special)|T],State0,State2) :-
2530		(Special \= regular_def
2531		-> State1=State0 % ignore special defs; they are processed separately
2532		; b_compute_expression_nowf(TypedExpr,[],State0,ResValue,'VisB definition',ID,VPos),
2533		State1 = [bind(ID,ResValue)|State0], % store value for later definitions and VisB items
2534		(debug_mode(off) -> true
2535		; translate_bvalue_to_codes_with_limit(ResValue,2000,RC),
2536		formatsilent(' VisB definition ~w == ~s~n',[ID,RC]))
2537		),
2538		eval_defs(T,State1,State2).
2539
2540		% check if we have a static value for a VisB definition:
2541		visb_def_static_value(DefID,Value) :-
2542		visb_definition(DefID,_,b(value(Value),_,_),Class,_,SpecialClass),
2543		SpecialClass = regular_def,
2544		(Class = requires_nothing ; Class = requires_constants). % probably we do not need to check this, as we have value/1
2545
2546		get_static_visb_state(InState,FullState) :-
2547		findall(bind(DefID,Value),visb_def_static_value(DefID,Value),FullState,InState).
2548		% TO DO: get state with deferred_set_elements,...
2549
2550		% ----------------------------------
2551
2552		% generate a stand-alone HTML file with a visualisation for all states in the list
2553
2554		generate_visb_html(StateIds,File,Options) :-
2555		safe_open_file(File,write,Stream,[encoding(utf8)]),
2556		generate_html_to_stream(StateIds,Stream,[html_file/File|Options]),
2557		close(Stream).
2558
2559		generate_visb_html_to_codes(StateIds,Options,Codes) :-
2560		with_open_stream_to_codes(
2561		generate_html_to_stream(StateIds,Stream,Options),
2562		Stream,Codes,[]).
2563
2564
2565		% generate an HTML file to visualise the given StateId
2566		generate_html_to_stream(StateIds,Stream,Options) :-
2567		set_id_namespace_prefix_for_states(StateIds,Options),
2568		write_visb_template('visb_template_header.html',Stream),
2569		(member(show_svg_downloads,Options) -> write_visb_template('visb_template_svg_downloads.html',Stream) ; true),
2570		format(Stream,' <script>~n',[]),
2571		retractall(js_generated_function(_)),
2572		length(StateIds,Len),
2573		format(Stream,' const differences = [~n',[]),
2574		maplist(gen_visb_visualise_function(Stream,Options,Len,StateIds),StateIds),
2575		write_visb_template('visb_template_replayTrace.html',Stream),
2576		format(Stream,' </script>~n~n',[]),
2577		gen_registerHovers_scipt(Stream,Options),
2578		write_visb_template('visb_template_middle.html',Stream),
2579		(no_svg_available
2580		-> format(Stream,' <button type="button" class="collapsible-style">No SVG Visualisation Available</button>~n',[])
2581		; % generate SVG section
2582		(member(no_header,Options) -> true
2583		; format(Stream,' <button type="button" class="collapsible collapsible-style active">SVG Visualisation</button>~n',[])
2584		),
2585		format(Stream,' <div style="position: relative;">~n',[]), % container for SVG download buttons
2586		format(Stream,' <div text-align="left" id="visb_svg_outer_container" class="svg-outer-container">~n',[]),
2587		format(Stream,' <div id="visb_svg_inner_container" class="svg-inner-container">~n',[]),
2588		%format(Stream,' <fieldset> <legend>Visualisation:</legend>~n',[]), % comment in to draw a border
2589		(StateIds = [SingleStateId] -> GenForState=SingleStateId ; GenForState=root),
2590		copy_svg_file_and_gen_objects(Stream,GenForState,_SVGinlined),
2591		% TO DO: avoid creating JS code below if _SVGinlined
2592		%format(Stream,' </fieldset>~n',[]),
2593		format(Stream,' </div>~n',[]), % inner container
2594		format(Stream,' </div>~n',[]), % outer container
2595		format(Stream,' <button id="btnResetScale" class="visualisation-button" onclick="resetScale()">Reset View</button>~n',[]),
2596		(member(show_svg_downloads,Options) ->
2597		format(Stream,' <button onclick="downloadSVG()">Save SVG (Current State)</button>~n',[]),
2598		format(Stream,' <button onclick="downloadAllSVGs()">Save all SVGs</button>~n',[])
2599		; true),
2600		format(Stream,' </div>~n',[]) % container for SVG download buttons
2601		),
2602		(Len>1, memberchk(show_sequence_chart,Options) % don't export PlantUML for list of state IDs (sequence chart depends on trace)
2603		-> (create_temp_puml_files(Len,Files),
2604		uml_generator:write_uml_sequence_chart_all_states(Files), % generate .puml files
2605		tools_commands:gen_plantuml_output(Files,svg,[]) % generate .svg files
2606		-> format(Stream,' <button type="button" class="collapsible collapsible-style active">Sequence Chart Visualisation</button>~n',[]),
2607		format(Stream,' <div class="seq-chart-container">~n',[]),
2608		reverse(Files,RFiles),
2609		write_temp_puml_outputs(1,RFiles,Stream), % write SVG contents to HTML
2610		format(Stream,' </div>~n',[])
2611		; add_warning(visb_visualiser,'HTML export: did not write the Sequence Diagram Visualisation due to an error in the PlantUML call.'),
2612		format(Stream,' <button type="button" class="collapsible-style">No Sequence Chart Visualisation Available</button>~n',[])
2613		)
2614		; true),
2615		(Len>1
2616		-> %format(Stream,'~n<h3>Run Trace</h3>~n',[]),
2617		format(Stream,' <button type="button" class="collapsible-style">Replay Trace</button>~n',[]),
2618		format(Stream,' <div class="coll-content-vis">~n',[]),
2619		format(Stream,' <button id="btnPrev" onclick="backStep()" title="Go back one step">« Back</button>~n',[]),
2620		format(Stream,' <button id="btnNext" onclick="forwardStep()" title="Go forward one step">Forward »</button>~n',[]),
2621		format(Stream,' <button onclick="runAll(10)" title="Fast replay of entire trace">Run Trace (10 ms delay)</button>~n',[]),
2622		format(Stream,' <button onclick="runAll(500)" title="Slow replay of entire trace">Run Trace (500 ms delay)</button>~n',[]),
2623		% We could decide to provide an option/preference for generating the visb_debug_messages field:
2624		% (check that ProB2-UI also generates this text field)
2625		format(Stream,' <br><label id="visb_debug_messages" class="visb-messages"> </label>~n',[]),
2626		format(Stream,' </div>~n',[]),
2627		format(Stream,' <progress id="trace_meter" min="0" max="~w" value="0"></progress>~n',[Len]) % progress of trace replay; note <meter> element also works
2628		; true
2629		),
2630		% generate a table with variables, constants, ...
2631		gen_state_table(Stream,Options,StateIds),
2632		gen_source_code_section(Stream,Options),
2633		% generate a table with the saved trace steps:
2634		(Len>1 -> gen_trace_table(Stream,StateIds) ; true),
2635		write_version_info(Stream,Options),
2636		(last(StateIds,_)
2637		-> format(Stream,' <script> replayStep(~w); </script>~n',[Len])
2638		% show the visualisation of the last state by default
2639		; true % trace is empty, there is no last item
2640		),
2641		write_visb_template('visb_template_footer.html',Stream),
2642		clear_id_namespace_prefix.
2643
2644		write_file_to_stream(File,Stream) :-
2645		safe_open_file(File,read,StreamIn,[encoding(utf8)]),
2646		copy_stream(StreamIn,Stream),
2647		close(StreamIn).
2648
2649		create_temp_puml_files(Len,[]) :- Len<1, !.
2650		create_temp_puml_files(Len,[Path|T]) :-
2651		system_call:get_temporary_filename('for_html.puml',Path),
2652		NewLen is Len-1,
2653		create_temp_puml_files(NewLen,T).
2654
2655		write_temp_puml_outputs(_,[],_).
2656		write_temp_puml_outputs(Nr,[File|T],Stream) :-
2657		tools:split_filename(File,FileRoot,_Ext),
2658		ajoin([FileRoot,'.svg'],SvgFile),
2659		format(Stream,' <div id="seq_chart_~w" style="display:none">~n',[Nr]), % container for seq. charts
2660		write_file_to_stream(SvgFile,Stream),
2661		format(Stream,' </div>~n',[]), % container for seq. charts
2662		NNr is Nr+1,
2663		write_temp_puml_outputs(NNr,T,Stream).
2664
2665		% -----------------
2666
2667		:- use_module(library(system),[ datime/1]).
2668		:- use_module(probsrc(tools_strings),[number_codes_min_length/3]).
2669		:- use_module(probsrc(tools),[gen_relative_path/3]).
2670		:- use_module(probsrc(version),[version_str/1]).
2671		:- use_module(probsrc(specfile),[currently_opened_file/1, get_internal_representation/1]).
2672		write_version_info(_,Options) :-
2673		member(no_version_info,Options),!.
2674		write_version_info(Stream,Options) :-
2675		version_str(Str),datime(datime(Yr,Mon,Day,Hr,Min,_Sec)),
2676		number_codes_min_length(Min,2,MC),
2677		format(Stream,' <button type="button" class="collapsible-style" title="Information about ProB and model">Info</button>~n',[]),
2678		format(Stream,'<div class="coll-content-vis visb-messages">~n',[]),
2679		format(Stream,'Generated on ~w/~w/~w at ~w:~s using <a href="https://prob.hhu.de/">ProB</a> version ~w~n',[Day,Mon,Yr,Hr,MC,Str]),
2680		(currently_opened_file(File)
2681		-> (File=package(Type) ->
2682		format(Stream,'<br>Main specification package: ~w~n',[Type])
2683		; atom(File), get_relative_path(File,Options,Suffix) ->
2684		format(Stream,'<br>Main specification file: ~w',[Suffix]),
2685		format_file_info(Stream,File)
2686		; format(Stream,'<br>Unknown main specification file: ~w~n',[File])
2687		)
2688		; true),
2689		(b_machine_name(MainName)
2690		-> format(Stream,'<br>Main specification name: ~w~n',[MainName]) ; true),
2691		(visb_file_loaded(JSONFile,_,ModLocTime),
2692		JSONFile \= ''
2693		-> get_relative_path(JSONFile,Options,JSuffix),
2694		format(Stream,'<br>Main VisB JSON file: ~w',[JSuffix]),
2695		format_modified_info(Stream,ModLocTime),
2696		(get_non_empty_svg_file(SVGFile,ModLocTime2)
2697		-> get_relative_path(SVGFile,Options,SSuffix),
2698		format(Stream,'<br>VisB SVG file: ~w',[SSuffix]),
2699		format_modified_info(Stream,ModLocTime2)
2700		; true
2701		)
2702		; true).
2703
2704		get_non_empty_svg_file(SVGFile,ModLocTime2) :-
2705		visb_svg_file(RelFile,SVGFile,_,_,ModLocTime2),
2706		RelFile \= ''.
2707
2708		format_file_info(Stream,File) :-
2709		catch(file_property(File, modify_localtime, ModLocTime),
2710		E,
2711		(add_message(visb_visualiser,'Could not obtain modification time for file: ',E), fail)),
2712		!,
2713		format_modified_info(Stream,ModLocTime).
2714		format_file_info(Stream,_) :- nl(Stream).
2715
2716		format_modified_info(Stream,ModLocTime) :-
2717		format(Stream,' (modified on ',[]),
2718		format_datime(Stream,ModLocTime),
2719		format(Stream,')~n',[]).
2720
2721		format_datime(Stream,datime(Yr,Mon,Day,Hr,Min,_Sec)) :-
2722		number_codes_min_length(Min,2,MC),
2723		format(Stream,'~w/~w/~w at ~w:~s',[Day,Mon,Yr,Hr,MC]).
2724
2725		get_relative_path(File,Options,RelPath) :-
2726		member(html_file/HF,Options),
2727		absolute_file_name(File,AF,[]),
2728		absolute_file_name(HF,AHF,[]),
2729		!,
2730		gen_relative_path(AF,AHF,RelPath). % only print relative information
2731		get_relative_path(File,_,File).
2732
2733
2734		% -----------------
2735
2736		% gen a table with all the individual steps of the trace
2737		gen_trace_table(Stream,StateIds) :-
2738		length(StateIds,Len),
2739		%format(Stream,'~n<h3>Trace (length=~w)</h3>~n',[Len]),
2740		format(Stream,' <button type="button" class="collapsible collapsible-style active">Trace (length=~w)</button>~n',[Len]),
2741		format(Stream,'<div class="coll-content-vis">~n',[]),
2742		(member(Obj,StateIds), get_state_and_action(Obj,_,_,DescStr), DescStr \= ''
2743		-> Opt=with_description ; Opt=no_description),
2744		gen_trace_table2(Stream,StateIds,Opt).
2745
2746		gen_trace_table2(Stream,StateIds,no_description) :-
2747		format(Stream,' <table> <tr> <th>Nr</th> <th>Event</th> <th>Target State ID</th> </tr>~n',[]),
2748		nth1(Nr,StateIds,Obj),
2749		get_state_and_action(Obj,StateId,ActionStr,_),
2750		((visited_state_corresponds_to_initialised_b_machine(StateId) ; xtl_mode) % allow onclick to all rows in xtl_mode
2751		-> (invariant_violated(StateId) -> BtnStyle='style="background-color:rgb(255,179,179);border-radius:6px" ' ; BtnStyle=''),
2752		format(Stream,'~n <tr id="row~w" onclick="replayStep(~w)"><td>~w</td><td style="cursor:pointer">~w</td><td><button ~wonclick="replayStep(~w);">State ~w</button></td></tr>~n',
2753		[Nr,Nr,Nr,ActionStr,BtnStyle,Nr,StateId])
2754		; format(Stream,'~n <tr id="row~w"><td>~w</td><td style="cursor:not-allowed">~w</td><td>State ~w</td></tr>~n',
2755		[Nr,Nr,ActionStr,StateId])
2756		),
2757		fail.
2758		gen_trace_table2(Stream,StateIds,with_description) :-
2759		format(Stream,' <table> <tr> <th>Nr</th> <th>Event</th> <th>Description</th> <th>Target State ID</th> </tr>~n',[]),
2760		nth1(Nr,StateIds,Obj),
2761		get_state_and_action(Obj,StateId,ActionStr,DescStr),
2762		atom_codes(ActionStr,ActionCodes),html_escape_codes(ActionCodes,EAS),
2763		atom_codes(DescStr,DescCodes),html_escape_codes(DescCodes,EDS),
2764		((visited_state_corresponds_to_initialised_b_machine(StateId) ; xtl_mode) % allow onclick to all rows in xtl_mode
2765		-> (invariant_violated(StateId) -> BtnStyle='style="background-color:rgb(255,179,179);border-radius:6px" ' ; BtnStyle=''),
2766		format(Stream,'~n <tr id="row~w" onclick="replayStep(~w)"><td>~w</td><td style="cursor:pointer">~s</td><td>~s</td><td><button ~wonclick="replayStep(~w);">State ~w</button></td></tr>~n',
2767		[Nr,Nr,Nr,EAS,EDS,BtnStyle, Nr,StateId])
2768		; format(Stream,'~n <tr id="row~w"><td>~w</td><td style="cursor:not-allowed">~s</td><td>~s</td><td>State ~w</td></tr>~n',
2769		[Nr,Nr,EAS,EDS,StateId])
2770		),
2771		fail.
2772		gen_trace_table2(Stream,_,_) :-
2773		format(Stream,' </table>~n </div>~n',[]).
2774
2775
2776		% utility to allow passing information about name of event/operation/action leading to state
2777		get_state_and_action(change_to_state_via_action(StateId,ActionStr,DescStr),StateId,ActionStr,DescStr) :- !.
2778		get_state_and_action(StateId,StateId,'','').
2779
2780		% -----------------
2781
2782		% inline provided svg file into html file:
2783		% second argument is either root or a particular state id for which the SVG file is to be created
2784		% the last argument is static_svg_inlined if all SVG objects were "inlined" into a single
2785		% SVG object (rather than via JavaScript functions to create the objects)
2786		copy_svg_file_and_gen_objects(Stream,_,static_svg_not_inlined) :- visb_svg_file(_,File,_,_,_), file_exists(File),
2787		!,
2788		write_file_to_stream(File,Stream),
2789		( get_visb_contents_def(Contents,DefName,DefPos,static_svg_not_inlined),
2790		ajoin(['Copying ',DefName,' *after* SVG file: '],Msg),
2791		add_message(visb_visualiser,Msg,File,DefPos),
2792		format(Stream,'~w~n',[Contents]),
2793		fail
2794		; true
2795		),
2796		gen_new_svg_objects(Stream).
2797		copy_svg_file_and_gen_objects(_,_,_) :-
2798		visb_svg_file(File,AFile,_,Pos,_),
2799		File \= '',
2800		add_error(visb_visualiser,'The specified VisB SVG file does not exist:',AFile,Pos),
2801		fail.
2802		copy_svg_file_and_gen_objects(Stream,SingleStateId,static_svg_inlined) :- % copy an empty SVG stub
2803		visb_file_loaded(_,_,_),!,
2804		write_default_svg_contents(Stream,inline_objects(SingleStateId)).
2805		copy_svg_file_and_gen_objects(_,_,static_svg_not_inlined). % no SVG required; we have no items or events: probably just want HTML export of variables,...
2806
2807		% get_code is faster than get_char or read_line for larger SVG files
2808		copy_stream(StreamIn,StreamOut) :-
2809		get_code(StreamIn, Code),
2810		(Code = -1 -> true
2811		; put_code(StreamOut,Code),
2812		copy_stream(StreamIn,StreamOut)
2813		).
2814
2815		% TODO: precompile and always assert as visb_special_definition (we could also evaluate it; could use template strings):
2816		get_visb_contents_def(Contents,DefName,DefPos,InlineObjects) :-
2817		get_and_eval_special_definition('VISB_SVG_CONTENTS',DefName,visb_contents,DefPos,ResValue,InlineObjects),
2818		b_value_to_string(ResValue,Contents).
2819		get_visb_contents_def(Contents,default_svg_contents,unknown,_InlineObjects) :-
2820		% default content, for VISB_CLICK_META_INFOS'jsVars
2821		Contents = '<script>let visb_vars = {};</script>'.
2822
2823		% get a definition either from B DEFINITIONS section, or if not present from the VisB JSON special definition list
2824		get_and_eval_special_definition(Prefix,DefName,JSONBackup,DefPos,ResValue,InlineObjects) :-
2825		(b_sorted_b_definition_prefixed(expression,Prefix,DefName,DefPos),
2826		b_get_typed_definition(DefName,[variables_and_additional_defs],TBody)
2827		;
2828		visb_special_definition(JSONBackup,DefName,_Type,TBody,_Class,DefPos)
2829		),
2830		% TODO: warn if we use static SVG
2831		get_typed_static_definition_with_constants_state(DefName,TBody,
2832		Body,DefPos,ConstantsState,InlineObjects,no_separation),
2833		evaluate_visb_formula(Body,DefName,'',ConstantsState,ResValue,DefPos).
2834
2835		write_default_svg_contents(Stream,InlineObjects) :-
2836		(visb_empty_svg_box_height_width(H,W,ViewBox) -> true ; H=400, W=400, ViewBox=''),
2837		format(Stream,'<svg xmlns=\"http://www.w3.org/2000/svg\"~n',[]),
2838		(ViewBox=''
2839		-> format(Stream,' width="~w" height="~w" viewBox="0 0 ~w ~w" >~n',[W,H,W,H])
2840		; format(Stream,' width="~w" height="~w" viewBox="~w" >~n',[W,H,ViewBox])
2841		),
2842		( get_visb_contents_def(Contents,_,_,InlineObjects),
2843		format(Stream,'~w~n',[Contents]),
2844		fail
2845		; true),
2846		(InlineObjects=inline_objects(StateID) -> inline_new_svg_objects(Stream,StateID) ; true),
2847		format(Stream,'</svg>~n',[]).
2848
2849		% get SVG file contents in case no SVG file is provided by user
2850		get_visb_default_svg_file_contents(Codes) :-
2851		with_open_stream_to_codes(
2852		write_default_svg_contents(Stream,inline_objects(root)),
2853		% allow inlining for groups and title children in ProB2-UI
2854		Stream,
2855		Codes, []).
2856
2857		% -----------------
2858
2859		% create a script to add all additional SVG objects
2860		gen_new_svg_objects(_) :- \+ visb_svg_object(_,_,_,_,_),!.
2861		gen_new_svg_objects(Stream) :-
2862		format(Stream, '<script>~n',[]),
2863		format(Stream, ' const svg = document.querySelector("svg");~n',[]),
2864		format(Stream, ' const svgns = "http://www.w3.org/2000/svg";~n',[]),
2865		(gen_new_svg_object(Stream,svg_root,_),fail ; true),
2866		format(Stream, '</script>~n',[]).
2867
2868		% generate JS script to create an individual new object
2869		gen_new_svg_object(Stream,ParentID,SVGID) :-
2870		visb_svg_object(SVGID,SVG_Class,AttrList,_,_Pos),
2871		(ParentID=svg_root
2872		-> \+ visb_svg_child(SVGID,_) % only generate root svg objects that have no parents
2873		; true),
2874		add_svg_id_prefix(SVGID,SVGID2),
2875		format(Stream,' if(document.getElementById("~w") == null) {~n',[SVGID2]),
2876		format(Stream,' var new___obj = document.createElementNS(svgns,"~w");~n',[SVG_Class]),
2877		format(Stream,' new___obj.setAttribute("~w","~w");~n',[id,SVGID2]),
2878		maplist(gen_new_svg_attr(Stream,SVGID2),AttrList),
2879		(ParentID \= svg_root
2880		-> format(Stream,' document.getElementById("~w").appendChild(new___obj);~n',[ParentID])
2881		; format(Stream,' svg.appendChild(new___obj);~n',[])
2882		),
2883		format(Stream,' }~n',[]),
2884		(visb_svg_parent(SVGID,ChildID), % we can now generate the children
2885		gen_new_svg_object(Stream,SVGID,ChildID),
2886		fail
2887		; true).
2888
2889		gen_new_svg_attr(Stream,_SVGID,svg_attribute(text,Val)) :- !,
2890		format(Stream,' new___obj.textContent = "~w";~n',[Val]).
2891		gen_new_svg_attr(Stream,_SVGID,svg_attribute(Attr,Val)) :-
2892		format(Stream,' new___obj.setAttribute("~w","~w");~n',[Attr,Val]).
2893
2894		% instead of creating a script to create new SVG objects,
2895		% create an inlined textual XML representation of the objects
2896		% this can be used to obtain a static SVG file which can be modified in an editor
2897		% and then later used instead of the VISB_SVG_OBJECTS definitions
2898		inline_new_svg_objects(Stream,StateId) :-
2899		get_dynamic_svgid_attributes_for_state(StateId,DynUpdateList), % compute updates only once
2900		visb_svg_object(SVGID,_,_,_,_), % lookup static SVG object
2901		\+ visb_svg_child(SVGID,_), % children will be created in the scope of their parent
2902		inline_new_svg_object(Stream,StateId,DynUpdateList,0,unknown,SVGID),
2903		fail.
2904		inline_new_svg_objects(_,_).
2905
2906		inline_new_svg_object(Stream,StateId,DynUpdateList,IndentLevel,ParentPos,SVGID) :-
2907		(visb_svg_object(SVGID,SVG_Class,StaticAttrList,_,Pos) -> true % lookup static SVG object
2908		; add_warning(visb_visualiser,'Unknown SVG child object: ',SVGID,ParentPos),fail
2909		),
2910		add_svg_id_prefix(SVGID,SVGID2), % for Jupyter
2911		indent_ws(Stream,IndentLevel),
2912		format(Stream,' <~w id="~w"',[SVG_Class,SVGID2]),
2913		(member(svgid_updates(SVGID,DynAttrList),DynUpdateList) % TODO: use avl_fetch
2914		-> override_attributes(StaticAttrList,DynAttrList,AttrList)
2915		; AttrList=StaticAttrList),
2916		maplist(format_new_svg_attr(Stream,SVGID,Pos,TextContent),AttrList),
2917		(TextContent=''
2918		-> EscapedTextContent="" % set Text variable to empty if unbound
2919		; do_not_escape_text_for_class(SVG_Class) -> atom_codes(TextContent,EscapedTextContent)
2920		; atom_codes(TextContent,TCC), html_escape_codes(TCC,EscapedTextContent)),
2921		format(Stream,'>~s',[EscapedTextContent]), % Note: this text is not inside quotes, we need HTML escape
2922		IL1 is IndentLevel+1,
2923		( visb_svg_parent(SVGID,Child),
2924		nl(Stream),
2925		inline_new_svg_object(Stream,StateId,DynUpdateList,IL1,Pos,Child),
2926		fail
2927		; true),
2928		format(Stream,'</~w>~n',[SVG_Class]), % end marker
2929		fail.
2930		inline_new_svg_object(_,_,_,_,_,_).
2931
2932		% for foreignObjects the text may contain HTML tags which should not be escaped:
2933		do_not_escape_text_for_class(foreignObject).
2934		do_not_escape_text_for_class(script). % otherwise " quotes will be escaped to "
2935
2936		indent_ws(_,X) :- X<1,!.
2937		indent_ws(Stream,X) :- write(Stream,' '), X1 is X-1, indent_ws(Stream,X1).
2938
2939		% combinde svg_attribute/2 terms from two sorted lists, giving precedence to second list
2940		override_attributes([],L,R) :- !, R=L.
2941		override_attributes(L,[],R) :- !, R=L.
2942		override_attributes([svg_attribute(Attr1,Val1)|T1],[svg_attribute(Attr2,Val2)|T2],[svg_attribute(Attr3,Val3)|T3]) :-
2943		(Attr1=Attr2
2944		-> Attr3=Attr1, Val3=Val2, % dynamic value Val2 takes precedence
2945		override_attributes(T1,T2,T3)
2946		; Attr1 @< Attr2 -> Attr3=Attr1, Val3=Val1, override_attributes(T1,[svg_attribute(Attr2,Val2)|T2],T3)
2947		; Attr3=Attr2, Val3=Val2, override_attributes([svg_attribute(Attr1,Val1)|T1],T2,T3)
2948		).
2949
2950		% get dynamic svg_attribute/2 list for a given state and SVG ID
2951		get_dynamic_svgid_attributes_for_state(root,List) :- !, List=[].
2952		get_dynamic_svgid_attributes_for_state(StateId,UpdateList) :-
2953		get_visb_attributes_for_state(StateId,List),
2954		sort(List,SList),
2955		group_set_attr(SList,'$$UNKNOWN$$',_,UpdateList).
2956
2957		group_set_attr([],_,[],[]).
2958		group_set_attr([set_attr(SvgID,Attr,Val)|T],SvgID,[svg_attribute(Attr,Val)|T1],T2) :- !,
2959		group_set_attr(T,SvgID,T1,T2).
2960		group_set_attr([set_attr(SvgID,Attr,Val)|T],_OldID,[],[svgid_updates(SvgID,L)|T2]) :- % a new SVGId is encountered
2961		group_set_attr([set_attr(SvgID,Attr,Val)|T],SvgID,L,T2).
2962
2963		% print svg attribute and extract text attribute
2964		format_new_svg_attr(Stream,SVGID,Pos,TextContent,svg_attribute(Attr,Val)) :- % TODO: text content
2965		(Attr=text
2966		-> (TextContent=Val -> true % TextContent is inially a variable and can be unified once
2967		; add_warning(inline_new_svg_objects,'Multiple text attributes for: ',SVGID,Pos),
2968		add_debug_message(inline_new_svg_objects,' * Using text 1: ',TextContent),
2969		add_debug_message(inline_new_svg_objects,' * Ignoring text 2: ',Val)
2970		)
2971		; number(Val) ->
2972		format(Stream,' ~w="~w"',[Attr,Val])
2973		; escape_value_to_codes_for_js(Val,ECodes) ->
2974		format(Stream,' ~w="~s"',[Attr,ECodes])
2975		; compound(Val) ->
2976		ajoin(['Cannot escape ',Attr,' *compound* value for ', SVGID,': '],Msg),
2977		add_error(visb_visualiser,Msg,Val,Pos),
2978		format(Stream,' ~w="~w"',[Attr,Val])
2979		; ajoin(['Cannot escape ',Attr,' value for ', SVGID,': '],Msg),
2980		add_error(visb_visualiser,Msg,Val,Pos),
2981		format(Stream,' ~w="~w"',[Attr,Val])
2982		).
2983
2984
2985		:- dynamic id_namespace_prefix/1.
2986		% prefix that can be useful for Jupyter notebooks so that for each state we have a different namespace
2987		% can also be useful for exporting a trace into a single HTML
2988		% TODO: does not work with JSON and SVG files
2989
2990		:- use_module(probsrc(gensym),[gensym/2]).
2991		set_id_namespace_prefix_for_states(_,Options) :-
2992		member(id_namespace_prefix(Pre),Options),!,
2993		(Pre = auto
2994		-> gensym('visb',ID), % for Jupyter this relies on the fact the gensym is *not* reset when loading another spec
2995		atom_concat(ID,'.',Prefix)
2996		; Prefix=Pre
2997		), set_id_namespace_prefix(Prefix).
2998		set_id_namespace_prefix_for_states(_,_).
2999
3000		set_id_namespace_prefix(Prefix) :- clear_id_namespace_prefix,
3001		assert(id_namespace_prefix(Prefix)).
3002		clear_id_namespace_prefix :- retractall(id_namespace_prefix(_)).
3003
3004		% add a namespace prefix to an SVG ID
3005		add_svg_id_prefix(SvgID,Res) :- id_namespace_prefix(Prefix),!,
3006		% option where we prefix all Ids with a namespace for Jupyter to combine multiple SVGs in single HTML page
3007		atom_concat(Prefix,SvgID,Res).
3008		add_svg_id_prefix(SvgID,SvgID).
3009
3010		% only add for known objects
3011		opt_add_svg_id_prefix(SvgID,Res) :- id_namespace_prefix(Prefix),
3012		visb_svg_object(SvgID,_,_,_,_),!, % only add prefix for SVG objects we know about (that were created by VisB)
3013		% option where we prefix all Ids with a namespace for Jupyter to combine multiple SVGs in single HTML page
3014		atom_concat(Prefix,SvgID,Res).
3015		opt_add_svg_id_prefix(SvgID,SvgID).
3016
3017		% -----------------
3018
3019		:- dynamic js_generated_function/1.
3020		:- dynamic last_attribute_values/3.
3021
3022		% define a visualise JS function to set the attributes for the given StateId
3023		gen_visb_visualise_function(Stream,Options,Len,StateIds,Obj) :-
3024		get_state_and_action(Obj,StateId,ActionStr,DescStr),
3025		nth1(Nr,StateIds,Obj),
3026		\+ js_generated_function(Nr), !,
3027		assertz(js_generated_function(Nr)),
3028		(Nr > 1 ->
3029		PrevNr is Nr-1, nth1(PrevNr,StateIds,PrevObj), get_state_and_action(PrevObj,PrevStateId,_,_)
3030		; PrevStateId = -1),
3031		visb_visualise_function_aux(Stream,Options,Len,StateId,PrevStateId,Nr,ActionStr,DescStr),
3032		(Nr == Len ->
3033		retractall(last_attribute_values(_,_,_)),
3034		format(Stream,' ]~n',[])
3035		; true).
3036		gen_visb_visualise_function(_,_,_,_,_).
3037
3038		:- use_module(extrasrc(bvisual2), [bv_get_top_level/1,bv_get_value_unlimited/3]).
3039		:- use_module(probsrc(tools),[string_escape/2]).
3040		visb_visualise_function_aux(Stream,_,Len,StateId,_,Nr,ActionStr,DescStr) :-
3041		format(Stream,' [~n',[]),
3042		(Len>1 -> format(Stream,' {id: "trace_meter", attr: "value", val: "~w"},~n',[Nr]) ; true),
3043		(escape_value_to_codes_for_js(ActionStr,EAS), escape_value_to_codes_for_js(DescStr,EDS) ->
3044		% was only string_escape before; however, this turns e.g. |-> into ↦ which we don't want (we are in JS part here)
3045		format(Stream,' {id: "visb_debug_messages", attr: "text", val: "Step ~w/~w, State ID: ~w, Event: ~s ~s"},~n',[Nr,Len,StateId,EAS,EDS])
3046		; string_escape(ActionStr,SEAS), string_escape(DescStr,SEDS), % fallback
3047		format(Stream,' {id: "visb_debug_messages", attr: "text", val: "Step ~w/~w, State ID: ~w, Event: ~w ~w"},~n',[Nr,Len,StateId,SEAS,SEDS])
3048		),
3049		get_change_attribute_for_state(StateId,SvgID,SvgAttribute,Value),
3050		\+ last_attribute_values(SvgID,SvgAttribute,Value),
3051		retractall(last_attribute_values(SvgID,SvgAttribute,_)),
3052		assertz(last_attribute_values(SvgID,SvgAttribute,Value)),
3053		opt_add_svg_id_prefix(SvgID,SvgID2),
3054		(escape_value_to_codes_for_js(Value,ECodes)
3055		-> format(Stream,' {id: "~w", attr: "~w", val: "~s"},~n',[SvgID2,SvgAttribute,ECodes])
3056		; format(Stream,' {id: "~w", attr: "~w", val: "~w"},~n',[SvgID2,SvgAttribute,Value])
3057		),
3058		fail.
3059		visb_visualise_function_aux(Stream,Options,Len,StateId,PrevStateId,_,_,_) :-
3060		b_or_z_mode,
3061		member(show_variables(VarList),Options),
3062
3063		visited_expression(StateId,State),
3064		(visited_expression(PrevStateId,PrevState) -> true ; PrevState=root),
3065
3066		show_var_in_visb(VarList,ID),
3067		get_state_value_change(StateId,State,ID,Options,ResValCodes),
3068
3069		% current value:
3070		ajoin(['bVar_',ID],SvgID),
3071		change_svg_attribute_differences_aux(Stream,SvgID,'text',ResValCodes),
3072
3073		Len > 1, % don't add previous value and change markers for state-only HTML
3074		(state_corresponds_to_fully_setup_b_machine(PrevState,_), % don't show prev values before initialisation
3075		get_state_value_change(PrevStateId,PrevState,ID,Options,PrevResValCodes)
3076		-> true
3077		; PrevResValCodes = "?"),
3078
3079		% mark row if value has changed in the last step
3080		ajoin(['row_bVar_',ID],SvgRowID),
3081		(ResValCodes = PrevResValCodes -> RowColor = white; RowColor = '#fffacd'),
3082		change_svg_attribute_differences_aux(Stream,SvgRowID,'bgcolor',RowColor),
3083
3084		% previous value:
3085		ajoin(['bVarPrev_',ID],SvgPrevID),
3086		change_svg_attribute_differences_aux(Stream,SvgPrevID,'text',PrevResValCodes),
3087
3088		fail.
3089		visb_visualise_function_aux(Stream,_Options,Len,StateId,PrevStateId,_,_,_) :-
3090		xtl_mode,
3091
3092		bv_get_top_level(IDs),
3093		member(ID,IDs),
3094		(bv_get_value_unlimited(ID,StateId,v(Val))
3095		-> atom_codes(Val,ResValCodes)
3096		; ResValCodes = ""),
3097
3098		% current value:
3099		ajoin(['bVar_',ID],SvgID),
3100		change_svg_attribute_differences_aux(Stream,SvgID,'text',ResValCodes),
3101
3102		Len > 1, % don't add previous value and change markers for state-only HTML
3103		(PrevStateId \= root,
3104		bv_get_value_unlimited(ID,PrevStateId,v(PrevVal))
3105		-> atom_codes(PrevVal,PrevResValCodes)
3106		; PrevResValCodes = ""),
3107
3108		% mark row if value has changed in the last step
3109		ajoin(['row_bVar_',ID],SvgRowID),
3110		(ResValCodes = PrevResValCodes -> RowColor = white; RowColor = '#fffacd'),
3111		change_svg_attribute_differences_aux(Stream,SvgRowID,'bgcolor',RowColor),
3112
3113		% previous value:
3114		ajoin(['bVarPrev_',ID],SvgPrevID),
3115		change_svg_attribute_differences_aux(Stream,SvgPrevID,'text',PrevResValCodes),
3116
3117		fail.
3118		visb_visualise_function_aux(Stream,Options,_,StateId,_,_,_,_) :-
3119		member(show_events(OpList),Options),
3120		get_state_value_enabled_operation_status(StateId,OpID,Enabled,ResValCodes,TransStr),
3121		show_var_in_visb(OpList,OpID),
3122		ajoin(['bOperation_',OpID],SvgID),
3123		\+ last_attribute_values(SvgID,'text',ResValCodes),
3124		retractall(last_attribute_values(SvgID,'text',_)),
3125		assertz(last_attribute_values(SvgID,'text',ResValCodes)),
3126		format(Stream,' {id: "~w", attr: "text", val: "~s"},~n',[SvgID,ResValCodes]),
3127		(Enabled=true -> BGCol=white ; BGCol='#f1f1f1'),
3128		format(Stream,' {id: "row_~w", attr: "bgcolor", val: "~s"},~n',[SvgID,BGCol]),
3129		escape_value_to_codes_for_js(TransStr,ETS),
3130		format(Stream,' {id: "name_~w", attr: "text", val: "~s"},~n',[SvgID,ETS]),
3131		% TO DO: highlight next event in trace, but then function needs one more parameter
3132		fail.
3133		visb_visualise_function_aux(Stream,Options,Len,_,_,Nr,_,_) :-
3134		(Len>1, member(show_sequence_chart,Options)
3135		-> format(Stream,' {id: "seq_chart_~w", attr: "style", val: "display:block"},~n',[Nr]),
3136		(Nr>1
3137		-> PNr is Nr-1, format(Stream,' {id: "seq_chart_~w", attr: "style", val: "display:none"},~n',[PNr])
3138		; gen_seq_charts_setup(Stream,Len))), % all sequence charts except the first should be invisible
3139		fail.
3140		visb_visualise_function_aux(Stream,_,Len,_,_,Nr,_,_) :-
3141		Nr == Len ->
3142		format(Stream,' ]~n',[])
3143		; format(Stream,' ],~n',[]).
3144
3145		gen_seq_charts_setup(_,Len) :- Len<2, !.
3146		gen_seq_charts_setup(Stream,Len) :-
3147		format(Stream,' {id: "seq_chart_~w", attr: "style", val: "display:none"},~n',[Len]),
3148		NLen is Len-1,
3149		gen_seq_charts_setup(Stream,NLen).
3150
3151		escape_value_to_codes_for_js(Atom,ECodes) :- atom(Atom),
3152		atom_codes(Atom,Codes), b_string_escape_codes(Codes,ECodes).
3153
3154		change_svg_attribute_differences_aux(Stream,ID,Attr,ValueCodes) :-
3155		(last_attribute_values(ID,Attr,ValueCodes)
3156		-> true
3157		; retractall(last_attribute_values(ID,Attr,_)),
3158		assertz(last_attribute_values(ID,Attr,ValueCodes)),
3159		format(Stream,' {id: "~w", attr: "~w", val: "~s"},~n',[ID,Attr,ValueCodes])
3160		).
3161
3162
3163
3164		% generate JS script to register hovers
3165		gen_registerHovers_scipt(Stream,Options) :- \+ visb_has_hovers(_),
3166		nonmember(debugging_hovers,Options),
3167		!, % no hover exists
3168		format(Stream,' <script> function registerHovers() {} </script>~n',[]).
3169		gen_registerHovers_scipt(Stream,Options) :-
3170		(member(debugging_hovers,Options) -> GenDebug=true ; GenDebug=false), % gen debugging hovers
3171		% Jquery is no longer required:
3172		%format(Stream,' <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>~n',[]),
3173		format(Stream,' <script>~n',[]),
3174		format(Stream,' function registerHovers() {~n',[]),
3175		format(Stream,' var obj;~n',[]),
3176		visb_has_hovers(SVGID), % only generate hover function if necessary; TODO: examine other IDs for GenDebug
3177		opt_add_svg_id_prefix(SVGID,SVGID2),
3178		format(Stream,' obj = document.getElementById("~w");~n',[SVGID2]),
3179		format(Stream,' obj.onmouseover = function(ev){~n',[]),
3180		(visb_hover(SVGID,ID,Attr,EnterVal,_,_),
3181		opt_add_svg_id_prefix(ID,ID2),
3182		(GenDebug=false -> true
3183		; format(Stream,' setAttr("~w","~w","SVG ID: ~w")~n',[visb_debug_messages,text,SVGID2])),
3184		format(Stream,' setAttr("~w","~w","~w")~n',[ID2,Attr,EnterVal]), fail ;
3185		format(Stream,' };~n',[])
3186		),
3187		format(Stream,' obj.onmouseout = function(){~n',[]),
3188		(visb_hover(SVGID,ID,Attr,_,LeaveVal,_),
3189		opt_add_svg_id_prefix(ID,ID2),
3190		(GenDebug=false -> true
3191		; format(Stream,' setAttr("~w","~w","~w")~n',[visb_debug_messages,text,'...'])
3192		),
3193		format(Stream,' setAttr("~w","~w","~w")~n',[ID2,Attr,LeaveVal]), fail ;
3194		format(Stream,' };~n',[])
3195		),
3196		fail.
3197		gen_registerHovers_scipt(Stream,_) :-
3198		format(Stream,' }~n </script>~n',[]).
3199
3200
3201		% ----------------------------------
3202
3203		:- use_module(probsrc(translate),[set_unicode_mode/0, unset_unicode_mode/0]).
3204		:- use_module(probsrc(state_space), [get_action_trace_with_limit/2, get_state_id_trace/1]).
3205
3206		generate_visb_html_for_history_with_source(File) :-
3207		generate_visb_html_for_history(File,
3208		[show_constants(all),show_sets(all),show_variables(all),show_events(all),show_invariants,show_source]).
3209		generate_visb_html_for_history_with_vars(File) :-
3210		generate_visb_html_for_history(File,[show_constants(all),show_sets(all),show_variables(all),show_events(all)]).
3211		generate_visb_html_for_history(File) :-
3212		generate_visb_html_for_history(File,[]).
3213		generate_visb_html_for_history(File,Options) :-
3214		start_ms_timer(Timer),
3215		get_state_id_trace(T),
3216		T = [root|StateIds],
3217		set_unicode_mode,
3218		call_cleanup(get_action_trace_with_limit(120,Actions), % TODO: also get description of JSON traces
3219		unset_unicode_mode),
3220		reverse(Actions,FActions),
3221		combine_state_and_actions(StateIds,[root|StateIds],FActions,List),
3222		generate_visb_html(List,File,Options),
3223		stop_ms_walltimer_with_msg(Timer,'exporting history to VisB HTML file: ').
3224
3225		:- use_module(probsrc(specfile),[get_operation_description_for_transition/4]).
3226		combine_state_and_actions([],_,[],[]).
3227		combine_state_and_actions([StateId|TS],[PrevId|TP],[action(ActionStr,ATerm)|TA],
3228		[change_to_state_via_action(StateId,ActionStr,Desc)|TRes]) :-
3229		(get_operation_description_for_transition(PrevId,ATerm,StateId,D) -> Desc=D ; Desc=''),
3230		combine_state_and_actions(TS,TP,TA,TRes).
3231
3232		generate_visb_html_for_current_state(File) :-
3233		generate_visb_html_for_current_state(File,[show_variables(all)]).
3234		generate_visb_html_for_current_state(File,Options) :-
3235		start_ms_timer(Timer),
3236		current_state_id(ID),
3237		generate_visb_html([ID],File,Options),
3238		stop_ms_walltimer_with_msg(Timer,'exporting current state to VisB HTML file: ').
3239		generate_visb_html_codes_for_states(StateIds,Options,Codes) :-
3240		generate_visb_html_to_codes(StateIds,Options,Codes). % write to codes list
3241
3242		% ------------------------------
3243
3244		:- use_module(probsrc(specfile),[b_or_z_mode/0]).
3245		:- use_module(probsrc(bmachine), [b_get_machine_variables/1, b_get_machine_constants/1, b_top_level_operation/1]).
3246		:- use_module(probsrc(bsyntaxtree), [get_texpr_id/2]).
3247		:- use_module(extrasrc(bvisual2), [bv_top_level_set/2]).
3248		:- use_module(probsrc(specfile),[get_specification_description/2]).
3249		:- use_module(probsrc(tools_strings), [atom_tail_to_lower_case/2]).
3250
3251		show_typed_var_in_visb(all,_) :- !.
3252		show_typed_var_in_visb(VarList,b(identifier(ID),_,_)) :- !, show_var_in_visb(VarList,ID).
3253		show_var_in_visb(VarList,ID ) :- (VarList=all -> true ; member(ID,VarList) -> true).
3254
3255		% generate a table for the state (we could use bvisual2)
3256		gen_state_table(Stream,Options,StateIds) :-
3257		b_or_z_mode,
3258		member(show_variables(VarList),Options),
3259		b_get_machine_variables(TypedVars),
3260		% is this useful if Len > 1, but StateIds are not from a trace? (see also below for formulas)
3261		(length(StateIds,Len), Len > 1 -> NOptions = [show_prev_value|Options] ; NOptions = Options),
3262		gen_state_table_aux(Stream,NOptions,'Variables',TypedVars,VarList,[],'Value','bVar_'),fail.
3263		gen_state_table(Stream,Options,StateIds) :-
3264		b_or_z_mode,
3265		member(show_variables(VarList),Options),
3266		b_get_machine_expressions(AExprs,Options), AExprs \= [],
3267		(length(StateIds,Len), Len > 1 -> NOptions = [show_prev_value|Options] ; NOptions = Options),
3268		gen_state_table_aux(Stream,NOptions,'Formulas',AExprs,VarList,[],'Value','bVar_'),fail.
3269		gen_state_table(Stream,Options,StateIds) :-
3270		b_or_z_mode,
3271		member(show_constants(IDList),Options),
3272		b_get_machine_constants(TypedVars),
3273		last(StateIds,Last), % we assume there is only one constant valuation in the trace; TO DO: generalise
3274		get_state_and_action(Last,LastId,_,_),
3275		visited_expression(LastId,BState),
3276		expand_to_constants_and_variables(BState,ConstState,_),
3277		gen_state_table_aux(Stream,Options,'Constants',TypedVars,IDList,ConstState,'Value','bConstant_'),fail.
3278		gen_state_table(Stream,Options,_) :-
3279		b_or_z_mode,
3280		member(show_sets(IDList),Options),
3281		findall(TSet,bv_top_level_set(TSet,_),TypedVars),
3282		findall(bind(Set,Val),(bv_top_level_set(TSet,Val),get_texpr_id(TSet,Set)),BState),
3283		gen_state_table_aux(Stream,Options,'Sets',TypedVars,IDList,BState,'Value','bSet_'),fail.
3284		% TO DO: maybe show also top-level guards specfile_possible_trans_name or get_top_level_guard
3285		gen_state_table(Stream,Options,_StateIds) :-
3286		b_or_z_mode,
3287		member(show_events(IDList),Options),
3288		get_specification_description(operations,SN),
3289		atom_tail_to_lower_case(SN,SectionName),
3290		findall(b(identifier(OpName),subst,[]),b_top_level_operation(OpName),TypedVars),
3291		% TODO: op(Params,Results) instead of subst
3292		gen_state_table_aux(Stream,Options,SectionName,TypedVars,IDList,[],'Enabled','bOperation_'),fail.
3293		gen_state_table(Stream,Options,StateIds) :-
3294		xtl_mode,
3295		(length(StateIds,Len), Len > 1 -> NOptions = [show_prev_value|Options] ; NOptions = Options),
3296		bv_get_top_level(IDs),
3297		findall(b(identifier(ID),string,[]), member(ID,IDs), Props),
3298		gen_state_table_aux(Stream,NOptions,'Properties',Props,IDs,[],'Value','bVar_'), fail.
3299		gen_state_table(_Stream,_,_).
3300
3301
3302		gen_source_code_section(Stream,Options) :-
3303		member(show_source,Options), % we could also include original sources, rather than just internal rep.
3304		!,
3305		Section = 'Source',
3306		format(Stream,' <button type="button" class="collapsible collapsible-style" title="Inspect source code of internal representation of ProB of model">~w</button>~n',[Section]),
3307		format(Stream,'<div class="coll-content-hid">~n',[]),
3308		get_internal_representation(PP),
3309		format(Stream,'<pre>~s</pre>~n',[PP]),
3310		format(Stream,'</div>~n',[]).
3311		gen_source_code_section(_Stream,_).
3312
3313
3314		:- use_module(probsrc(bsyntaxtree),[get_texpr_description/2, get_texpr_type/2]).
3315		% creates a HTML table with header name Section and including one row per ID in TypedVars;
3316		% id of value for ID is prefixed with IDPrefix
3317		% VarListToShow is either all or a list of ids
3318		gen_state_table_aux(Stream,Options,Section,TypedVars,VarListToShow,BState,ValueStr,IDPrefix) :-
3319		include(show_typed_var_in_visb(VarListToShow),TypedVars,SVars), % check which ids should be shown
3320		length(SVars,SLen), SLen>0,
3321		length(TypedVars,Len),
3322		(SLen=Len
3323		-> format(Stream,' <button type="button" class="collapsible collapsible-style">~w (~w)</button>~n',[Section,SLen])
3324		; format(Stream,' <button type="button" class="collapsible collapsible-style">~w (~w/~w)</button>~n',
3325		[Section,SLen,Len])
3326		),
3327		format(Stream,'<div class="coll-content-hid">~n',[]),
3328		(member(show_prev_value,Options) % add extra column for previous value of variables (and animation expressions)
3329		-> format(Stream,' <table> <tr> <th>Nr</th> <th>Name</th> <th>Value</th> <th>Previous Value</th> </tr>~n',[])
3330		; format(Stream,' <table> <tr> <th>Nr</th> <th>Name</th> <th>~w</th> </tr>~n',[ValueStr])),
3331		( nth1(Nr,SVars,IDorExprToShow),
3332		get_state_table_name_and_expr(IDorExprToShow,ID,LongID,TExpr),
3333		(get_state_value_codes_for_id(BState,ID,Options,_,ValCodes)
3334		-> html_escape_codes(ValCodes,EVC) % Value provided in BState; may be overriden in trace export
3335		; EVC = "?"),
3336		get_table_hover_message_codes(ID,TExpr,HoverMsgC),
3337		(member(show_prev_value,Options) % add previous value of variables (and animation expressions)
3338		-> % for variables the values are added later in JS
3339		% do we want to show the previous value in the state only HTML?
3340		format(Stream,'~n <tr id="row_~w~w" title="~s"> <td>~w</td> <td id="name_~w~w">~w</td> <td id="~w~w">?</td> <td id="bVarPrev_~w">?</td> </tr>~n',
3341		[IDPrefix,ID, HoverMsgC, Nr, IDPrefix,ID,LongID, IDPrefix,ID, ID ])
3342		;
3343		format(Stream,'~n <tr id="row_~w~w" title="~s"> <td>~w</td> <td id="name_~w~w">~w</td> <td id="~w~w">~s</td> </tr>~n',
3344		[IDPrefix,ID, HoverMsgC, Nr, IDPrefix,ID,LongID, IDPrefix,ID,EVC])),
3345		fail
3346		;
3347		format(Stream,' </table>~n </div>~n',[])
3348		).
3349
3350		%get_state_table_name_and_expr(bexpr(Kind,TExpr),Name,LongName,Expr) :- !, % we have special expression to show
3351		% Name=Kind,LongName=Kind,Expr=TExpr.
3352		get_state_table_name_and_expr(bexpr(Kind,TExpr),ID,LongName,Expr) :- !, % we have special expression to show
3353		ID=Kind, % ID for SVG updates, ...
3354		translate_bexpression_with_limit(TExpr,200,TS),
3355		ajoin([Kind,' == ',TS],LongName),
3356		Expr=TExpr.
3357		get_state_table_name_and_expr(TID,ID,ID,TID) :- get_texpr_id(TID,ID). % normal case: variable name
3358
3359
3360		:- use_module(probsrc(bmachine),[b_get_machine_animation_expression/2, b_get_operation_variant/3, b_nth1_invariant/3]).
3361
3362		visb_machine_animation_expression(variant,AEName,Variant,_) :-
3363		b_get_operation_variant(Name,ConvOrAnt,Variant),
3364		ajoin(['Variant for ',Name, ' (',ConvOrAnt,')'],AEName).
3365		visb_machine_animation_expression(animation_expression,Name,TExpr,_) :-
3366		b_get_machine_animation_expression(Name,TExpr).
3367		visb_machine_animation_expression(invariant,Name,TPred,Options) :-
3368		member(show_invariants,Options),
3369		b_nth1_invariant(Nr,TPred,_),
3370		ajoin(['INVARIANT-',Nr],Name).
3371		% TODO: we should also adapt get_state_value_change to return true when invariant_violated is false for the state
3372		% we could also only include this section when there is an invariant violation in the trace?
3373
3374		b_get_machine_expressions(List,Options) :-
3375		findall(bexpr(AE_Name,AExpr),visb_machine_animation_expression(_,AE_Name,AExpr,Options),List).
3376		% 'ANIMATION_EXPRESSION' or invariants or variants
3377
3378		:- use_module(probsrc(bmachine),[b_get_machine_operation_signature/2]).
3379		% get hover message for entries in variables/constants/... rows:
3380		get_table_hover_message_codes(ID,TExpr,EscHoverMsg) :-
3381		get_texpr_type(TExpr,Type),
3382		(Type=subst,b_get_machine_operation_signature(ID,TS)
3383		-> ajoin(['Operation: ',TS],HoverMsg)
3384		; pretty_type(Type,TS),
3385		(get_texpr_description(TExpr,Desc)
3386		-> ajoin(['Type: ',TS,'\nDesc: ',Desc],HoverMsg)
3387		; ajoin(['Type: ',TS],HoverMsg)
3388		)
3389		),
3390		atom_codes(HoverMsg,HoverCodes),
3391		html_escape_codes(HoverCodes,EscHoverMsg).
3392
3393		% get the values that should be displayed in the variables table
3394		get_state_value_change(StateId,State,ID,Options,ECodes) :-
3395		extract_variables_from_state(State,VariableBState),
3396		( get_state_value_codes_for_id(VariableBState,ID,Options,Val,ValCodes) % look up variable values
3397		; visb_machine_animation_expression(_,_,_,Options) ->
3398		state_corresponds_to_fully_setup_b_machine(State,FullState),
3399		get_state_value_codes_for_anim_expr(StateId,FullState,ID,Options,Val,ValCodes) % evaluate animation expressions
3400		),
3401		escape_if_necessary(Val,ValCodes,ECodes). % change " to \" for JavaScript
3402		% formatsilent('Value for ~w~nunescaped: "~s",~n escaped: "~s"~n',[ID,ValCodes,ECodes]).
3403
3404		% avoid unnecessary escaping traversals:
3405		escape_if_necessary([],ValCodes,Res) :- !, Res=ValCodes.
3406		escape_if_necessary(int(_),ValCodes,Res) :- !, Res=ValCodes.
3407		escape_if_necessary(pred_true,ValCodes,Res) :- !, Res=ValCodes.
3408		escape_if_necessary(pred_false,ValCodes,Res) :- !, Res=ValCodes.
3409		escape_if_necessary(_,ValCodes,ECodes) :- b_string_escape_codes(ValCodes,ECodes).
3410
3411
3412		get_state_value_codes_for_id(BState,ID,Options,Val,ValCodes) :-
3413		member(bind(ID,Val),BState),
3414		translate_values_for_state_table(Val,Options,ValCodes).
3415
3416		% translate a value for display in state table (not yet escaped)
3417		translate_values_for_state_table(Val,Options,ValCodes) :-
3418		(member(limit_for_values(Nr),Options)
3419		-> translate_bvalue_to_codes_with_limit(Val,Nr,ValCodes)
3420		; get_preference(expand_avl_upto,Max), Max<0
3421		-> translate_bvalue_to_codes(Val,ValCodes) % unlimited
3422		; translate_bvalue_to_codes_with_limit(Val,10000,ValCodes)
3423		).
3424
3425		:- use_module(probsrc(bsyntaxtree), [safe_create_texpr/3]).
3426		get_state_value_codes_for_anim_expr(StateId,BState,AE_Name,Options,ResValue,ValCodes) :-
3427		visb_machine_animation_expression(Kind,AE_Name,AExpr,Options),
3428		(Kind=invariant
3429		-> ((invariant_not_yet_checked(StateId) ; invariant_violated(StateId))
3430		-> (safe_create_texpr(convert_bool(AExpr),boolean,TExpr),
3431		evaluate_visb_formula(TExpr,AE_Name,'',BState,ResValue,unknown)
3432		-> translate_pred_val(ResValue,ValCodes)
3433		; ResValue=pred_unknown, ValCodes = "?" % WD error?
3434		)
3435		; ResValue=pred_true, translate_pred_val(pred_true,ValCodes) % no need to evaluate invariant
3436		)
3437		; evaluate_visb_formula(AExpr,AE_Name,'',BState,ResValue,unknown),
3438		translate_values_for_state_table(ResValue,Options,ValCodes)
3439		).
3440		translate_pred_val(pred_true,[8868]). % see translate:unicode_translation(truth,X).
3441		translate_pred_val(pred_false,[8869]). % see translate:unicode_translation(falsity,X).
3442
3443		:- use_module(probsrc(bmachine),[b_get_machine_operation_max/2]).
3444		:- use_module(probsrc(state_space),[time_out_for_node/3,max_reached_for_node/1]).
3445		:- use_module(probsrc(translate),[translate_event_with_src_and_target_id/5]).
3446		get_state_value_enabled_operation_status(StateId,OpName,Enabled,EnabledValue,TransStr) :-
3447		b_top_level_operation(OpName),
3448		findall(TransID, (transition(StateId,OpTerm,TransID,_NewStateId),
3449		match_operation(OpTerm,OpName)), TransList),
3450		length(TransList,Len),
3451		(Len>0
3452		-> Enabled=true,
3453		EnabledValue = "\x2705\", % green check mark, TRUE alternatives \x2705\ \x2713\ \x2714\
3454		(TransList=[TID], transition(StateId,OpTerm,TID,NewStateId),
3455		translate_event_with_src_and_target_id(OpTerm,StateId,NewStateId,200,TransStr)
3456		-> true
3457		; ajoin([OpName,' (',Len,'\xd7\)'],TransStr) %
3458		)
3459		; time_out_for_node(StateId,OpName,TypeOfTimeOut) ->
3460		Enabled=TypeOfTimeOut,
3461		EnabledValue = [8987], % four o'clock symbol
3462		TransStr = OpName
3463		%ajoin(['No transition found due to: ',TypeOfTimeOut],HoverMsg)
3464		; get_preference(maxNrOfEnablingsPerOperation,0) ->
3465		Enabled=not_computed,
3466		EnabledValue = [10067], % red question mark
3467		TransStr = OpName
3468		%'No transitions were computed because MAX_OPERATIONS = 0' = HoverMsg
3469		; b_get_machine_operation_max(OpName,0) ->
3470		Enabled=not_computed,
3471		EnabledValue = [10067], % red question mark
3472		TransStr = OpName
3473		%ajoin(['No transitions were computed because MAX_OPERATIONS_',OpName,' = 0'],HoverMsg)
3474		; Enabled=false,
3475		EnabledValue = [9940], % stop sign, FALSE, alternatives \x10102\
3476		TransStr = OpName
3477		%ajoin(['Not enabled'],HoverMsg)
3478		). % TO DO: show whether this is the next step in the trace
3479
3480		% --------------------------
3481
3482		% debugging features to inspect all created SVG objects
3483		tcltk_get_visb_objects(list([Header|AllObjects])) :-
3484		Header = list(['SVG-ID','svg_class','Attribute','Value']),
3485		findall(list([SvgID,SvgClass,Attr,Value]),
3486		(visb_svg_object(SvgID,SvgClass,AttrList,_Desc,_Pos),
3487		(member(svg_attribute(Attr,Value),AttrList) ;
3488		visb_svg_parent(SvgID,Value), Attr=children)
3489		), AllObjects).
3490
3491		% debugging features to inspect all created SVG objects
3492		tcltk_get_visb_hovers(list([Header|AllObjects])) :-
3493		Header = list(['SVG-ID','ID','Attribute','EnterValue', 'ExitValue']),
3494		findall(list([SvgID,ID,Attr,EnterVal,ExitVal]),
3495		visb_hover(SvgID,ID,Attr,EnterVal,ExitVal,_Pos), AllObjects).
3496
3497		% debugging features to inspect items
3498		tcltk_get_visb_items(Res) :-
3499		current_state_id(ID),
3500		tcltk_get_visb_items(ID,Res).
3501		tcltk_get_visb_items(_StateId,Res) :-
3502		\+ visb_file_is_loaded(_),!,
3503		Res = list(['No VisB JSON file loaded']).
3504		tcltk_get_visb_items(StateId,list([Header|AllItems])) :-
3505		Header = list(['SVG-ID','Attribute','Value']),
3506		get_preference(translation_limit_for_table_commands,Limit),
3507		findall(list([SvgID,SvgAttribute,Val]),
3508		get_change_attribute_for_state(StateId,SvgID,SvgAttribute,Val),
3509		Items),
3510		findall(list([DefID,'VisB Definition',DValS]),
3511		(get_expanded_bstate(StateId,ExpandedBState),
3512		reverse(ExpandedBState,RS),
3513		member(bind(DefID,DVal),RS),
3514		visb_definition(DefID,_,_,_,_,_),
3515		translate_bvalue_with_limit(DVal,Limit,DValS)),
3516		AllItems, Items).
3517
3518		:- use_module(probsrc(translate),[translate_event_with_limit/3]).
3519		tcltk_get_visb_events(Res) :-
3520		current_state_id(ID),
3521		tcltk_get_visb_events(ID,Res).
3522		tcltk_get_visb_events(_StateId,Res) :-
3523		\+ visb_file_is_loaded(_),!,
3524		Res = list(['No VisB JSON file loaded']).
3525		tcltk_get_visb_events(StateId,list([Header|AllItems])) :-
3526		Header = list(['SVG-ID','Event','Target']),
3527		get_preference(translation_limit_for_table_commands,Limit),
3528		findall(list([SvgID,EventStr,NewStateId]),
3529		(perform_visb_click_event(SvgID,[],StateId,_Event,OpTerm,NewStateId,Res),
3530		(Res=[] -> EventStr='disabled' ; translate_event_with_limit(OpTerm,Limit,EventStr))
3531		),
3532		AllItems).
3533		% --------------------------
3534
3535		% for ProB2-UI
3536
3537		:- use_module(probsrc(translate),[translate_bexpression_with_limit/3]).
3538		get_visb_items(List) :-
3539		findall(visb_item(SvgID,Attr,TS,Desc,Pos),
3540		(visb_item(SvgID,Attr,TypedExpr,_Used,Desc,Pos,_),
3541		translate_bexpression_with_limit(TypedExpr,1000,TS)), List).
3542
3543		get_visb_attributes_for_state(StateId,List) :-
3544		% some external functions like ENABLED are evaluated in current state; it might be useful to set_current_state
3545		(visb_file_is_loaded(_) -> true
3546		; add_warning(visb_visualiser,'No VisB visualisation loaded, cannot get attributes for state: ',StateId)),
3547		findall(set_attr(SvgID,SvgAttribute,Val),
3548		get_change_attribute_for_state(StateId,SvgID,SvgAttribute,Val),
3549		List).
3550
3551		% for ProB2-UI
3552		get_visb_click_events(List) :-
3553		findall(execute_event(SvgID,Event,Preds),
3554		get_visb_event(SvgID,Event,Preds), List).
3555		get_visb_event(SvgID,Event,Preds) :- visb_event(SvgID,Event,Preds,_,_File,_Pos).
3556		get_visb_event(SvgID,'',[]) :- % add a virtual empty event for SVG Ids with hovers but no events
3557		visb_has_hovers(SvgID),
3558		\+ visb_event(SvgID,_,_,_,_File,_Pos).
3559
3560
3561		:- use_module(probsrc(state_space), [extend_trace_by_transition_ids/1]).
3562		% perform a click on a VisB SVG ID in the animator
3563		tcltk_perform_visb_click_event(SvgID) :- current_state_id(StateId),
3564		(perform_visb_click_event(SvgID,[],StateId,TransitionIDs)
3565		-> formatsilent('Clicking on ~w in state ~w resulted in transition id sequence ~w~n',[SvgID,StateId,TransitionIDs]),
3566		extend_trace_by_transition_ids(TransitionIDs)
3567		; add_error(visb_visualiser,'Cannot perform VisB click on: ',SvgID)
3568		).
3569
3570		% computes the effect of clicking on an SvgID in StateId
3571		% it returns either empty list if the visb_event is not feasible or a list of transition ids
3572		% it fails if SvgID has no events associated with it
3573		perform_visb_click_event(SvgID,MetaInfos,StateId,ResTransitionIds) :-
3574		perform_visb_click_event(SvgID,MetaInfos,StateId,_,_,_,ResTransitionIds).
3575		perform_visb_click_event(SvgID,MetaInfos,StateId,OpName,OpTerm,NewStateId,ResTransitionIds) :-
3576		get_expanded_bstate(StateId,ExpandedBState),
3577		set_error_context(checking_context('VisB:','performing click event')),
3578		set_context_state(StateId,perform_visb_click_event),
3579		get_svgid_with_events(SvgID,_),
3580		call_cleanup(perform_aux(SvgID,StateId,ExpandedBState,OpName,OpTerm,NewStateId,ResTransitionIds,MetaInfos),
3581		(clear_context_state,clear_error_context)).
3582
3583		get_svgid_with_events(SvgID,FirstOpName) :- visb_event(SvgID,FirstOpName,_,_,_File,_Pos).
3584
3585
3586		:- use_module(probsrc(tools),[safe_read_term_from_atom/2]).
3587		:- use_module(probsrc(state_space),[transition/4]).
3588		perform_aux(SvgID,StateId,_ExpandedBState,OpName,OpTerm,NewStateId,ResTransitionIds,_MetaInfos) :-
3589		\+ b_or_z_mode,
3590		% just look up transition/4 entries in state space
3591		% TODO: maybe provide this possibility for B models, even if using explicit parameter values is more robust
3592		get_visb_event_operation(SvgID,OpName,Preds,_Pred,Pos),
3593		safe_read_term_from_atom(OpName,OpTerm0),
3594		(xtl_mode -> check_xtl_direct_transition_candidate(OpTerm0,Preds,Pos), OpTerm=OpTerm0 ; true), !,
3595		% for XTL: use exec by pred for arity 0, otherwise try to find transition term in state space
3596		if((transition(StateId,OpTerm,TransID,NewStateId),
3597		match_operation(OpTerm,OpName)), % match is relevant if \+xtl_mode
3598		ResTransitionIds = [TransID],
3599		return_disabled(SvgID,StateId,OpName,OpTerm,NewStateId,ResTransitionIds)
3600		).
3601		perform_aux(SvgID,StateId,ExpandedBState,OpName,OpTerm,NewStateId,ResTransitionIds,MetaInfos) :-
3602		%state_space:portray_state_space,
3603		if(execute_visb_event_by_predicate(SvgID,StateId,ExpandedBState,OpName,OpTerm,NewStateId,TransIds,MetaInfos),
3604		ResTransitionIds = TransIds,
3605		return_disabled(SvgID,StateId,OpName,OpTerm,NewStateId,ResTransitionIds)).
3606
3607		check_xtl_direct_transition_candidate(OpTerm,Preds,Pos) :-
3608		nonvar(OpTerm), % upper case event names are interpreted as Prolog variables -> use exec by pred (or FIXME)
3609		functor(OpTerm,_,Ar), Ar>0, % use exec by pred for arity 0, otherwise try to find transition term in state space
3610		(Preds \= []
3611		-> add_warning(visb_visualiser,'Ignoring predicates for VisB XTL event with explicit transition term (use predicate to provide parameter values): ',OpTerm,Pos)
3612		; true).
3613
3614		return_disabled(SvgID,StateId,OpName,OpTerm,NewStateId,ResTransitionIds) :-
3615		OpTerm = disabled, NewStateId = StateId,
3616		get_svgid_with_events(SvgID,OpName),
3617		ResTransitionIds = []. % visb_event not enabled
3618
3619		:- use_module(probsrc(tools_strings),[match_atom/2]).
3620		:- use_module(probsrc(specfile),[get_operation_name/2]).
3621		match_operation(OpTerm,OpTerm) :- !.
3622		match_operation(OpTerm,OpName) :- atom(OpName),
3623		(get_operation_name(OpTerm,OpName)
3624		; match_atom(OpName,OpTerm) % match an atom string with a compound term
3625		),!.
3626
3627		execute_visb_event_by_predicate(SvgID,StateId,ExpandedBState,OpName,OpTerm,NewStateId,TransIds,MetaInfos) :-
3628		get_visb_event_operation(SvgID,OpName,_,Pred,Pos),
3629		build_visb_click_meta_object(MetaInfos,BMetaInfos),
3630		bsyntaxtree:replace_id_by_expr(Pred,'VISB_CLICK_META_INFOS',BMetaInfos,NPred),
3631		exec_aux(SvgID,StateId,ExpandedBState,OpName,NPred,Pos,OpTerm,NewStateId,TransIds).
3632
3633		build_visb_click_meta_object(MetaInfos,BMetaInfos) :-
3634		(member(alt_key,MetaInfos) -> AltKey = pred_true ; AltKey = pred_false),
3635		(member(ctrl_key,MetaInfos) -> CtrlKey = pred_true ; CtrlKey = pred_false),
3636		(member(meta_key,MetaInfos) -> MetaKey = pred_true ; MetaKey = pred_false),
3637		(member(pageX(PageX),MetaInfos) -> true ; PageX = 0), % fallback
3638		(member(pageY(PageY),MetaInfos) -> true ; PageY = 0), % fallback
3639		(member(shift_key,MetaInfos) -> ShiftKey = pred_true ; ShiftKey = pred_false),
3640		findall(','(string(Var),string(VarValue)), member(js_var(Var,VarValue), MetaInfos), JSVars),
3641
3642		visb_click_meta_b_type(BType),
3643		BMetaInfos = b(value(rec([
3644		field(altKey,AltKey),
3645		field(ctrlKey,CtrlKey),
3646		field(jsVars,JSVars),
3647		field(metaKey,MetaKey),
3648		field(pageX,int(PageX)),
3649		field(pageY,int(PageY)),
3650		field(shiftKey,ShiftKey)
3651		])),BType,[visb_generated]).
3652
3653		visb_click_meta_b_type(record([
3654		field(altKey,boolean),
3655		field(ctrlKey,boolean),
3656		field(jsVars,set(couple(string,string))),
3657		field(metaKey,boolean),
3658		field(pageX,integer),
3659		field(pageY,integer),
3660		field(shiftKey,boolean)
3661		])).
3662
3663		:- use_module(probsrc(tcltk_interface),[compute_all_transitions_if_necessary/2]).
3664		:- use_module(library(random),[random_member/2]).
3665		:- use_module(extrasrc(mcts_game_play), [mcts_auto_play/4, mcts_auto_play_available/0]).
3666		:- use_module(probsrc(tools_timeout), [time_out_with_factor_call/3]).
3667		exec_aux(SvgID,StateId,ExpandedBState,OpName,Pred,Pos,OpTerm,NewStateId,[TransId]) :-
3668		(b_or_z_mode -> b_is_operation_name(OpName) ; true), !, % note: ignores special definitions below if not B mode
3669		time_out_with_factor_call(
3670		exec_op_by_pred_aux(StateId,ExpandedBState,OpName,Pred,OpTerm,NewState,Pos),
3671		5, % min_max_time_out(10,100,15000)
3672		(ajoin(['TIME-OUT for VisB click on SVG ID ', SvgID,' while executing operation by predicate: '],Msg),
3673		add_warning(visb_visualiser,Msg,OpName,Pos),fail)),
3674		patch_state(NewState,StateId,PatchedNewState),
3675		tcltk_interface:add_trans_id(StateId,OpTerm,PatchedNewState,NewStateId,TransId).
3676		%translate:print_bstate(PatchedNewState),nl.
3677		exec_aux(SvgID,StateId,_ExpandedBState,'MCTS_AUTO_PLAY',_Pred,Pos,OpTerm,NewStateId,[TransId]) :- !,
3678		mcts_auto_play_available,
3679		% TODO: allow to set SimRuns, TimeOut in Pred
3680		add_debug_message(visb_visualiser,'Performing MCTS_AUTO_PLAY for click on: ',SvgID,Pos),
3681		mcts_auto_play(StateId,OpTerm,TransId,NewStateId).
3682		exec_aux(_SvgID,StateId,_ExpandedBState,'RANDOM_ANIMATE',_Pred,_Pos,OpTerm,NewStateId,[TransId]) :- !,
3683		compute_all_transitions_if_necessary(StateId,false),
3684		write(ra(_Pred)),nl,
3685		findall(rtr(OpTerm,TransId,NewStateId),transition(StateId,OpTerm,TransId,NewStateId),List),
3686		random_member(rtr(OpTerm,TransId,NewStateId),List).
3687		% see tcltk_interface:tcltk_random_perform2 and allow Kind: fully_random, no_self_loops, heuristics, ...
3688		% split with ; ?
3689		exec_aux(SvgID,StateId,ExpandedBState,'RANDOM_ANIMATE_UNTIL_LTL',LTLExpr,Pos,OpTerm,NewStateId,TransIds) :- !,
3690		OpTerm = 'RANDOM_ANIMATE_UNTIL_LTL',
3691		(get_texpr_type(LTLExpr,string),
3692		evaluate_visb_formula(LTLExpr,'RANDOM_ANIMATE_UNTIL_LTL',SvgID,ExpandedBState,Value,Pos),
3693		Value = string(LTLFormula)
3694		-> tcltk_interface:tcltk_animate_until(LTLFormula,StateId,1000,ltl_state_property,_Steps,_Res,NewStateId,TransIds)
3695		; add_error(visb_visualiser,'Argument to RANDOM_ANIMATE_UNTIL_LTL must provide LTL formula as string:',StateId)
3696		).
3697
3698		:- use_module(probsrc(b_state_model_check),[execute_operation_by_predicate_in_state_with_pos/6,
3699		xtl_execute_operation_by_predicate_in_state/7]).
3700		exec_op_by_pred_aux(StateId,ExpandedBState,OpName,Pred,OpTerm,NewState,Pos) :- xtl_mode,!,
3701		visited_expression(StateId,RawState),
3702		xtl_execute_operation_by_predicate_in_state(ExpandedBState,RawState,OpName,Pred,OpTerm,NewState,Pos).
3703		exec_op_by_pred_aux(_StateId,ExpandedBState,OpName,Pred,OpTerm,NewState,Pos) :-
3704		execute_operation_by_predicate_in_state_with_pos(ExpandedBState,OpName,Pred,OpTerm,NewState,Pos).
3705
3706		:- use_module(probsrc(bmachine), [b_is_variable/1,b_machine_has_constants/0]).
3707
3708		is_var_binding(bind(Var,_)) :- b_or_z_mode, b_is_variable(Var).
3709
3710
3711		% remove constants and VisB Definition entries from state:
3712		patch_state(NewState,_StateId,PatchedState) :-
3713		\+ b_or_z_mode, !, PatchedState=NewState. % XTL state is raw state
3714		patch_state(NewState,StateId,PatchedState) :-
3715		get_constants_id_for_state_id(StateId,ConstId),!,
3716		PatchedState = const_and_vars(ConstId,VarsState),
3717		include(is_var_binding,NewState,VarsState).
3718		patch_state(NewState,StateId,VarsState) :-
3719		(b_machine_has_constants
3720		-> add_error(visb_visualiser,'Could not extract constants id for state:',StateId),
3721		VarsState=NewState
3722		; include(is_var_binding,NewState,VarsState)).
3723
3724		% the next predicate gets all operations/events associated with SvgID in the order in which they were found
3725		% note that there is only one visb_event (the last one); all others are auxiliary
3726		get_visb_event_operation(SvgID,OpName,Preds,TypedPred,Pos) :- % check if there are more events registered:
3727		auxiliary_visb_event(SvgID,OpName,Preds,TypedPred,Pos).
3728		get_visb_event_operation(SvgID,OpName,Preds,TypedPred,Pos) :-
3729		visb_event(SvgID,OpName,Preds,TypedPred,_File,Pos).
3730
3731		% ---------------
3732
3733		get_visb_hovers(List) :-
3734		findall(hover(SvgID,ID,Attr,EnterVal,ExitVal),
3735		visb_hover(SvgID,ID,Attr,EnterVal,ExitVal,_), List).
3736
3737		get_visb_svg_objects(List) :-
3738		% TODO: remove objects inlined in get_visb_default_svg_file_contents
3739		findall(visb_svg_object(SvgID,SvgClass,AttrList),
3740		visb_svg_object(SvgID,SvgClass,AttrList,_Desc,_Pos), List).
3741
3742		% ------------------
3743
3744		:- use_module(probsrc(bmachine),[b_absolute_file_name_relative_to_main_machine/2]).
3745		extended_static_check_default_visb_file :-
3746		(get_default_visb_file(VisBFile,Pos)
3747		% TODO: we could check if we have an visb_history(JSONFile,_,_) option
3748		-> extended_static_check_visb_file(VisBFile,Pos)
3749		; true).
3750
3751		extended_static_check_visb_file('',_InclusionPos) :-
3752		load_visb_file('').
3753		extended_static_check_visb_file(VisBFile,InclusionPos) :-
3754		b_absolute_file_name_relative_to_main_machine(VisBFile,AFile),
3755		(file_exists(AFile)
3756		-> load_visb_file(AFile)
3757		; add_warning(lint,'VISB_JSON_FILE does not exist: ',AFile,InclusionPos)
3758		).
3759
3760		% ---------------------------
3761
3762		% portray all VisB items in DEFINITION B syntax
3763		get_visb_ids(SIds) :-
3764		findall(Id,visb_id(Id),Ids),
3765		sort(Ids,SIds).
3766
3767		visb_id(ID) :- visb_svg_object(ID,_,_,_,_). % see svg_id_exists
3768		visb_id(ID) :- visb_item(ID,_,_,_,_,_,_), \+ visb_svg_object(ID,_,_,_,_).
3769		visb_id(ID) :- visb_event(ID,_,_,_,_,_), \+ visb_svg_object(ID,_,_,_,_).
3770		visb_id(ID) :- visb_hover(ID,_,_,_,_,_), \+ visb_svg_object(ID,_,_,_,_).
3771
3772		:- public portray_visb/0.
3773		portray_visb:-
3774		get_visb_ids(SIds), nth1(Nr,SIds,ID),
3775		%visb_svg_object(ID,SVG_Class,NewRestAttrs,Desc,Pos1),
3776		findall(field(Attr,b(value(StaticVal),any,[])),
3777		(visb_svg_object(ID,SVG_Class,StaticAttrs,Desc,_Pos1),
3778		( Attr=svg_class,StaticVal=string(SVG_Class)
3779		; Attr=comment,StaticVal=string(Desc)
3780		; member(svg_attribute(Attr,StaticVal),StaticAttrs))
3781		),
3782		StaticValues),
3783		findall(field(Attr,TypedExpr),
3784		visb_item(ID,Attr,TypedExpr,_UsedIds,_Desc,_PosStartOfItem,_Meta), % meta can contain override
3785		Updates,StaticValues),
3786		% TODO: incorporate events and hovers
3787		UpdateRec = b(rec(Fields),any,[]),
3788		gen_string(ID,IDS),
3789		Fields = [field(id,IDS) | Updates],
3790		(StaticValues=[] -> format('~nVISB_SVG_UPDATES~w == ',[Nr]) ; format('~nVISB_SVG_OBJECTS~w == ',[Nr])),
3791		translate:print_bexpr(UpdateRec), write(';'), nl,
3792		fail.
3793		portray_visb.
3794		gen_string(ID,b(string(ID),string,[])).
3795		% use_module(visbsrc(visb_visualiser)), visb_visualiser:portray_visb.