/* Part of SWI-Prolog Author: Jan Wielemaker E-mail: J.Wielemaker@uva.nl WWW: http://www.swi-prolog.org Copyright (C): 2010, University of Amsterdam This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA As a special exception, if you link this library with other files, compiled with a Free Software compiler, to produce an executable, this library does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU General Public License. */ :- module(rdf_diagram, [ rdf_diagram_from_file/1 % +File ]). :- use_module(library(pce)). :- use_module(library(pce_tagged_connection)). :- use_module(library(autowin)). :- use_module(library(pce_report)). :- use_module(library(print_graphics)). :- use_module(library(rdf_parser)). % get access to declared namespaces /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - This file defines the class rdf_diagram, a window capable of showing a set of triples. The predicate rdf_diagram_from_file(+File) is a simple demo and useful tool to show RDF from simple RDF files. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ /******************************* * SIMPLE ENTRY * *******************************/ % rdf_diagram_from_file(+File) % % Show the triples from File in a window. rdf_diagram_from_file(File) :- absolute_file_name(File, [ access(read), extensions([rdf,rdfs,owl,'']) ], AbsFile), load_rdf(AbsFile, Triples, [ expand_foreach(true) ]), new(D, rdf_diagram(string('RDF diagram for %s', File))), send(new(report_dialog), below, D), send(D, triples, Triples), send(D, open). /******************************* * CLASS RDF-DIAGRAM * *******************************/ :- pce_begin_class(rdf_diagram, auto_sized_picture, "Show set of RDF triples in a window"). :- use_class_template(print_graphics). variable(auto_layout, bool := @on, both, "Automatically layout on resize"). variable(type_in_node, bool := @on, both, "Display type inside node"). initialise(D, Label:[name]) :-> send_super(D, initialise, Label), send(D, scrollbars, both), send(D, fill_popup), send(D, resize_message, if(and(D?auto_layout == @on, D?focus_recogniser == @nil), message(D, layout))). fill_popup(D) :-> send(D, popup, new(P, popup)), send_list(P, append, [ menu_item(layout, message(D, layout)), gap, menu_item(print, message(D, print)) ]). :- pce_group(triples). append(D, Triple:prolog) :-> "Append and rdf(Subject, Predicate, Object) triple":: ( subject_name(Triple, SubjectName), get(D, resource, SubjectName, Subject), ( get(D, type_in_node, @on), is_type(Triple) -> object_resource(Triple, ObjectName), send(Subject, type, ObjectName) ; predicate_name(Triple, PredName), ( object_resource(Triple, ObjectName) -> get(D, resource, ObjectName, Object) ; object_literal(Triple, Literal) -> get(D, literal, Literal, Object) ), send(Subject, connect, PredName, Object) ) -> true ; term_to_atom(Triple, Atom), ignore(send(D, report, error, 'Failed to display triple: %s', Atom)) ). triples(D, Triples:prolog) :-> "Show disgram from Prolog triples":: send(D, clear), forall(member(T, Triples), send(D, append, T)), send(D, layout). resource(D, Resource:name) :-> "Add Resource to diagram":: get(D, resource, Resource, @on, _). resource(D, Resource:name, Create:[bool], Subject:rdf_resource) :<- "Get reference for a subject or create one":: ( get(D, member, Resource, Subject) -> true ; Create \== @off, get(D, create_resource, Resource, Subject), send(D, display, Subject, D?visible?center) ). literal(D, Value:prolog, Gr:rdf_literal) :<- "Display a literal. Don't try to re-use":: ( literal_name(Value, Name), get(D, member, Name, Gr) -> true ; get(D, create_literal, Value, Gr), send(D, display, Gr, D?visible?center) ). create_resource(D, Resource:name, Subject:rdf_resource) :<- "Create visualisation of Resource":: new(Subject, rdf_resource(Resource, D)). create_literal(_D, Value:prolog, Gr:rdf_literal) :<- "Create visualisation of literal":: new(Gr, rdf_literal(Value)). node_label(_D, Resource:name, Label:name) :<- "Generate label to show for a node":: local_name(Resource, Label). :- pce_group(layout). layout(D) :-> "Produce automatic layout":: new(Nodes, chain), send(D?graphicals, for_all, if(message(@arg1, instance_of, rdf_any), message(Nodes, append, @arg1))), send(Nodes?head, layout, 2, 40, iterations := 200, area := D?visible, network := Nodes). copy_layout(D, From:rdf_diagram, Subst:prolog) :-> "Copy the layout from another windows":: send(D?graphicals, for_some, message(D, copy_location, @arg1, From, prolog(Subst))). copy_location(_D, Obj:graphical, From:rdf_diagram, Subst:prolog) :-> "Copy location of a single RDF object":: ( send(Obj, instance_of, rdf_any) -> ( get(Obj, name, Name), find(From, Name, Subst, FromObj) -> format('Copied location of ~p from ~p~n', [Obj, FromObj]), get(FromObj, center, Center), send(Obj, center, Center) ) ; true ). find(D, Name, _Subst, Obj) :- get(D, member, Name, Obj). find(D, Name, Subst, Obj) :- member(Name=AltName, Subst), atom_concat('_:', AltName, FullAltName), get(D, member, FullAltName, Obj). find(D, Name, Subst, _) :- format('Cannot find ~w in ~p, Subst =~n', [Name, D]), pp(Subst), fail. :- pce_end_class(rdf_diagram). /******************************* * SHAPES * *******************************/ :- pce_begin_class(rdf_connection, tagged_connection, "Represents a triple"). :- pce_global(@rdf_link, new(link(link, link, line(0,0,0,0,second)))). initialise(C, Gr1:graphical, Gr2:graphical, Pred:name, Ctx:[object]) :-> "Create from predicate":: send_super(C, initialise, Gr1, Gr2, @rdf_link), send(C, tag, rdf_label(Pred, italic, Ctx)). ideal_length(C, Len:int) :<- "Layout: compute the desired length":: get(C, height, H), ( H < 40 -> get(C, tag, Tag), get(Tag, width, W), Len is W + 30 ; Len = 40 ). :- pce_end_class(rdf_connection). :- pce_begin_class(rdf_any(name), figure, "Represent an RDF resource or literal"). handle(w/2, 0, link, north). handle(w, h/2, link, east). handle(w/2, h, link, south). handle(0, h/2, link, west). initialise(F, Ref:name) :-> "Create visualisation":: send_super(F, initialise), send(F, name, Ref). connect(F, Pred:name, Object:graphical) :-> new(_C, rdf_connection(F, Object, Pred, F)). :- pce_global(@rdf_any_recogniser, make_rdf_any_recogniser). :- pce_global(@rdf_any_popup, make_rdf_any_popup). make_rdf_any_recogniser(G) :- new(M1, move_gesture(left)), new(M2, move_network_gesture(left, c)), new(P, popup_gesture(@receiver?popup)), new(G, handler_group(M1, M2, P)). popup(_F, Popup:popup) :<- "Create popup menu":: Popup = @rdf_any_popup. make_rdf_any_popup(Popup) :- new(Popup, popup), Gr = @arg1, send(Popup, append, menu_item(layout, message(Gr, layout))). event(F, Ev:event) :-> ( \+ send(Ev, is_a, ms_right_down), send_super(F, event, Ev) -> true ; send(@rdf_any_recogniser, event, Ev) ). node_label(F, Resource:name, Label:name) :<- "Return label to use for a resource":: get(F, device, Dev), ( send(Dev, has_get_method, node_label) -> get(Dev, node_label, Resource, Label) ; local_name(Resource, Label) ). :- pce_end_class(rdf_any). :- pce_begin_class(move_network_gesture, move_gesture, "Move network of connected graphicals"). variable(outline, box, get, "Box used to indicate move"). variable(network, chain*, both, "Stored value of the network"). variable(origin, point, get, "Start origin of network"). /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - The gesture maintains an outline, the selection to be moved and the positon where the move orginiated. The outline itself is given a normal move_gesture to make it move on dragging. This move_gesture should operate on the same button and modifier. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ initialise(G, B:[button_name], M:[modifier]) :-> send(G, send_super, initialise, B, M), send(G, slot, outline, new(Box, box(0,0))), send(G, slot, origin, point(0,0)), send(Box, texture, dotted), send(Box, recogniser, move_gesture(G?button, G?modifier)). initiate(G, Ev:event) :-> get(Ev, receiver, Gr), get(Gr, device, Dev), get(G, outline, Outline), get(Gr, network, Network), send(G, network, Network), new(Union, area(0,0,0,0)), send(Network, for_all, message(Union, union, @arg1?area)), send(G?origin, copy, Union?position), send(Outline, area, Union), send(Union, done), send(Dev, display, Outline), ignore(send(Ev, post, Outline)). drag(G, Ev) :-> send(Ev, post, G?outline). /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Terminate. First undisplay the outline. Next calculate by how much the outline has been dragged and move all objects of the selection by this amount. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ terminate(G, Ev:event) :-> ignore(send(G, drag, Ev)), get(G, outline, Outline), send(Outline, device, @nil), get(Outline?area?position, difference, G?origin, Offset), get(G, network, Network), send(Network, for_all, message(@arg1, relative_move, Offset)), send(G, network, @nil). :- pce_end_class(move_network_gesture). :- pce_begin_class(rdf_label, text, "Label for an RDF relation"). variable(resource, name, get, "Represented predicate"). initialise(L, Pred:name, Font:font, Context:[object]) :-> ( Context == @default -> local_name(Pred, Label) ; get(Context, node_label, Pred, Label) ), send_super(L, initialise, Label, center, Font), send(L, slot, resource, Pred), send(L, background, @default). :- pce_global(@rdf_label_recogniser, make_rdf_label_recogniser). make_rdf_label_recogniser(G) :- new(G, handler_group), send(G, append, handler(area_enter, message(@receiver, identify))), send(G, append, handler(area_exit, message(@receiver, report, status, ''))), send(G, append, popup_gesture(new(P, popup))), send_list(P, append, [ menu_item(copy, message(@display, copy, @arg1?resource)) ]). event(F, Ev:event) :-> ( send_super(F, event, Ev) -> true ; send(@rdf_label_recogniser, event, Ev) ). identify(L) :-> send(L, report, status, '%s', L?resource). :- pce_end_class. :- pce_begin_class(rdf_resource, rdf_any, "Represent an RDF resource"). initialise(F, Ref:name, Ctx:[object]) :-> "Create visualisation":: send_super(F, initialise, Ref), send(F, display, ellipse(100, 50), point(-50,-25)), send(F, display, new(T, rdf_label(Ref, normal, Ctx))), send(T, center, point(0,0)). type(F, Type:name) :-> send(F, display, new(TL, rdf_label(Type, small, F))), send(TL, center, point(0,14)), get(F, member, ellipse, E), send(E, shadow, 2). identify(F) :-> send(F, report, status, 'Resource %s', F?name). :- pce_end_class(rdf_resource). :- pce_begin_class(rdf_literal, rdf_any, "Represent an RDF literal value"). variable(value, prolog, get, "Represented literal value"). initialise(F, Value:prolog) :-> "Create visualisation":: send(F, slot, value, Value), literal_label(Value, Label), atom_concat('__lit:', Label, Id), send_super(F, initialise, Id), send(F, display, new(B, box)), send(B, fill_pattern, colour(grey80)), send(B, pen, 0), send(F, display, new(T, text(Label, center))), send(T, center, point(0,0)), send(F, fit). literal_label(literal(Value0), Value) :- !, literal_label(Value0, Value). literal_label(xml(Value0), Value) :- !, literal_label(Value0, Value). literal_label(Value, Value) :- atomic(Value), !. literal_label(Value, Label) :- term_to_atom(Value, Label). literal_name(Value, Name) :- literal_label(Value, Label), atom_concat('__lit:', Label, Name). fit(F) :-> "Make box fit contents":: get(F, member, text, Text), get(Text?area, clone, Area), send(Area, increase, 3), get(F, member, box, Box), send(Box, area, Area). :- pce_end_class(rdf_literal). /******************************* * PRIMITIVES * *******************************/ subject_name(rdf(Name0, _, _), Name) :- resource_name(Name0, Name). predicate_name(rdf(_, Name0, _), Name) :- resource_name(Name0, Name). object_resource(rdf(_, _, Name0), Name) :- resource_name(Name0, Name). object_literal(rdf(_,_,Literal), Literal). resource_name(Name, Name) :- atom(Name), !. resource_name(rdf:Local, Name) :- !, % known namespaces atomic_list_concat([rdf, :, Local], Name). resource_name(NS:Local, Name) :- !, atom_concat(NS, Local, Name). resource_name(node(Anon), Name) :- % Not for predicates atom_concat('_:', Anon, Name). is_type(rdf(_, rdf:type, _)) :- !. % our parser is_type(rdf(_, Pred, _)) :- % our parser atom(Pred), rdf_name_space(NS), atom_concat(NS, type, Pred), !. % local_name(+Resource, -Label) % % Return easy readable local name local_name(Resource, Local) :- sub_atom(Resource, _, _, A, #), sub_atom(Resource, _, A, 0, Local), \+ sub_atom(Local, _, _, _, #), !. local_name(Resource, Local) :- atom_concat('rdf:', Local, Resource), !. local_name(Resource, Local) :- file_base_name(Resource, Local), Local \== ''. local_name(Resource, Resource).