/* Part of XPCE --- The SWI-Prolog GUI toolkit Author: Jan Wielemaker and Anjo Anjewierden E-mail: J.Wielemaker@vu.nl WWW: http://www.swi-prolog.org/projects/xpce/ Copyright (c) 1999-2011, University of Amsterdam VU University Amsterdam All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ :- module(pce_meta, [ pce_to_method/2, % +Spec, -BehaviourObject isa_class/2, % ?SubClassName, ?SuperClassName current_class/2, % ?ClassName, ?ClassObject to_class_name/2, % +NameOrClass, -ClassName pce_library_class/4, % ?Name, ?Super, ?Comment, ?File implements/2, % ?Class, ?SendOrGet(?Name) implements/3, % idem, -Method pce_to_pl_type/2, % +PceType, -PrologType type_accepts_function/1, % +Type classify_class/2 % +Class, -Classification ]). :- use_module(library(pce)). :- require([ pce_error/1 , chain_list/2 , get_chain/3 , maplist/3 ]). /** Reflection support for XPCE This module defines utilities to simplify reflexion support of XPCE, notably implementing non-deterministic logical relations on top of the deterministic XPCE methods. */ /******************************* * INTERACTION SUPPORT * *******************************/ %! pce_to_method(+Spec, -Object) is semidet. % % Object is the XPCE object described by Spec. Spec is one of % % * send(Receiver, Selector) % * ->(Receiver, Selector) % Find a send-method on Receiver % * get(Receiver, Selector) % * <-(Receiver, Selector) % Find a get-method on Receiver % * Receiver-Selector % Find an instance variable (slot) on Receiver % * ClassName % Find a class from its name pce_to_method(->(Receiver, Selector), Method) :- !, ( atom(Receiver) -> get(@pce, convert, Receiver, class, Class), get(Class, send_method, Selector, Method) ; object(Receiver) -> get(Receiver, send_method, Selector, tuple(_, Method)) ). pce_to_method(<-(Receiver, Selector), Method) :- !, ( atom(Receiver) -> get(@pce, convert, Receiver, class, Class), get(Class, get_method, Selector, Method) ; object(Receiver) -> get(Receiver, get_method, Selector, tuple(_, Method)) ). pce_to_method((Receiver-Selector), Method) :- !, ( atom(Receiver) -> get(@pce, convert, Receiver, class, Class), get(Class, instance_variable, Selector, Method) ; object(Receiver), get(Receiver, attribute, Method) -> true ; object(Receiver), get(Receiver, class, Class), get(Class, instance_variable, Selector, Method) ). pce_to_method(ClassName, Class) :- atom(ClassName), get(@pce, convert, ClassName, class, Class), !. pce_to_method(Method, Method) :- object(Method), !. pce_to_method(get(Receiver, Selector), Method) :- !, pce_to_method(<-(Receiver, Selector), Method). pce_to_method(send(Receiver, Selector), Method) :- !, pce_to_method(->(Receiver, Selector), Method). /******************************* * CLASSES * *******************************/ %! isa_class(?Sub, ?Super) % % Succeeds if Sub is Super or below Super. Can be used with any % instantiation. If class is instantiated the super-chain is % followed. isa_class(Class, Super) :- ground(Class), !, gen_super(Class, Super). isa_class(Class, Super) :- current_class(Class, ClassObject), current_class(Super, SuperObject), send(ClassObject, is_a, SuperObject). gen_super(Class, Class). gen_super(Class, Super) :- current_class(Class, ClassObject), get(ClassObject, super_class, SuperObject), current_class(Super0, SuperObject), gen_super(Super0, Super). %! current_class(?Name, ?Class) % % Convert between name and class object. Insufficient instantation % enumerates the classes. :- dynamic current_class_cache/2. make_current_class :- retractall(current_class_cache(_,_)), send(@classes, for_all, message(@prolog, assert_class, @arg1, @arg2)), send(class(class), created_message, message(@prolog, assert_class, @arg2?name, @arg2)). assert_class(Name, Object) :- assert(current_class_cache(Name, Object)). :- initialization make_current_class. current_class(Class, ClassObject) :- current_class_cache(Class, ClassObject). current_class(Class, ClassObject) :- pce_prolog_class(Class), \+ current_class_cache(Class, _), get(@pce, convert, Class, class, ClassObject). %! to_class_name(+AtomOrClass, -ClassName) % % Convert a name or class-object into a class name to_class_name(Name0, Name) :- atom(Name0), !, ( current_class(Name0, _) -> Name = Name0 ; pce_error(no_class(Name0)) ). to_class_name(ClassObj, Name) :- object(ClassObj), send(ClassObj, instance_of, class), !, get(ClassObj, name, Name). /******************************* * LIBRARY * *******************************/ :- dynamic library_index/4, index_files/1. %! pce_library_class(?Name, ?Super, ?Comment, ?File) % % Examine the library index for defined classes. pce_library_class(Name, Super, Comment, library(File)) :- atom(Name), !, ( library_index(Name, Super, Comment, File) *-> true ; update_library_index, library_index(Name, Super, Comment, File) ). update_library_index :- setof(File, index_file(File), Files), ( index_files(Files) -> true ; retractall(index_files(_)), retractall(library_index(_,_,_,_)), load_index_files(Files), assert(index_files(Files)) ). index_file(File) :- absolute_file_name(library('CLASSINDEX.pl'), File, [ access(read), solutions(all), file_errors(fail) ]). load_index_files([]). load_index_files([H|T]) :- load_index_file(H), load_index_files(T). load_index_file(File) :- open(File, read, In), read(In, Term), call_cleanup(read_index(Term, In), close(In)). read_index(end_of_file, _) :- !. read_index(class(Name, Super, Comment, File), In) :- assert(library_index(Name, Super, Comment, File)), read(In, Term), read_index(Term, In). /******************************* * METHODS * *******************************/ %! implements(?Class:atom, ?Method:atom) is nondet. %! implements(?Class:atom, ?Method:atom, -MethodObj:object) is nondet. % % True if Class implements the method. If class is a variable, % backtracking yields all classes % % `What' may be wrapped in self(What) or root(What). Using % self(What) returns only those classes that have a non-inherited % implementation of the method, while using root(What) returns % only those classes for which there is no super-class % implementing the requested method. % % @param Class Name of XPCE class % @param Method One of send(Name) or get(Name) % @param MethodObj XPCE Object representing the method implements(Class, What) :- implements(Class, What, _). implements(Class, self(What), Method) :- implements(Class, What, Method), get(Method, context, ClassObject), get(ClassObject, name, Class). implements(Class, root(What), Method) :- implements(Class, self(What), Method), ( send(Method, has_get_method, inherited_from) -> \+ get(Method, inherited_from, _) ; true ). implements(Class, send(Name), Method) :- current_class(Class, ClassObject), ( atom(Name) -> get(ClassObject, send_method, Name, Method) ; isa_class(Class, Super), current_class(Super, SuperObject), ( get_chain(SuperObject, send_methods, Methods) ; get_chain(SuperObject, instance_variables, Methods) ), member(Method, Methods), get(Method, name, Name), get(ClassObject, send_method, Name, Method) % not overruled ). implements(Class, get(Name), Method) :- current_class(Class, ClassObject), ( atom(Name) -> get(ClassObject, get_method, Name, Method) ; isa_class(Class, Super), current_class(Super, SuperObject), ( get_chain(SuperObject, get_methods, Methods) ; get_chain(SuperObject, instance_variables, Methods) ), member(Method, Methods), get(Method, name, Name), get(ClassObject, get_method, Name, Method) ). /******************************* * TYPES * *******************************/ %! pce_to_pl_type(+PceType, -PrologType) % Convert an XPCE Type object to our type-checkers type-logic. % pce_to_pl_type(Type, Pl) :- get(Type, kind, Kind), pce_to_pl_type(Kind, Type, Pl0), type_supers(Pl0, Type, Pl). type_supers(Pl0, Type, Pl) :- get(Type, supers, Supers), Supers \== @nil, !, chain_list(Supers, SuperList), maplist(pce_to_pl_type, SuperList, PlSupers), list_to_or([Pl0|PlSupers], Pl). type_supers(Pl, _, Pl). pce_to_pl_type(class, Type, Pl) :- get(Type, context, Context), ( atom(Context) -> Class = Context ; get(Context, name, Class) ), class_type(Class, Pl). pce_to_pl_type(class_object, _, and(sub(object), not(sub(function)))). pce_to_pl_type(unchecked, _, or(sub(object), integer)). pce_to_pl_type(any, _, and(or(sub(object), integer), not(sub(function)))). pce_to_pl_type(int, _, integer). pce_to_pl_type(char, _, integer(0,255)). pce_to_pl_type(int_range, T, integer(Low, High)) :- get(T, context, tuple(Low0, High0)), to_range_boundary(Low0, Low), to_range_boundary(High0, High). pce_to_pl_type(real_range, T, float(Low, High)) :- get(T, context, tuple(Low0, High0)), to_range_boundary(Low0, Low), to_range_boundary(High0, High). pce_to_pl_type(event_id, _, or(integer, atom)). pce_to_pl_type(value, T, value(V)) :- get(T, context, V). pce_to_pl_type(name_of, T, Pl) :- get_chain(T, context, Atoms), list_to_value_or(Atoms, Pl). pce_to_pl_type(member, T, PlType) :- get(T, context, T2), pce_to_pl_type(T2, PlType). pce_to_pl_type(value_set, T, Pl) :- get_chain(T, context, Elements), list_to_value_or(Elements, Pl). pce_to_pl_type(compound, T, PlType) :- get_chain(T, context, Supers), maplist(pce_to_pl_type, Supers, PlSupers), list_to_or(PlSupers, PlType). pce_to_pl_type(alias, T, PlType) :- get(T, context, T2), pce_to_pl_type(T2, PlType). pce_to_pl_type(alien, _, integer). class_type(name, atom) :- !. class_type(number, integer) :- !. class_type(real, float) :- !. class_type(Class, sub(Class)). to_range_boundary(N, unbound) :- unbound(N), !. to_range_boundary(N, N). unbound(@nil). unbound(1073741823). unbound(-1073741824). list_to_or([X], X) :- !. list_to_or([A|B], or(A, C)) :- list_to_or(B, C). list_to_value_or([X], value(X)) :- !. list_to_value_or([A|B], or(value(A), T)) :- list_to_value_or(B, T). %! type_accepts_function(+Type) % % Succeeds if Type accepts function arguments type_accepts_function(Type) :- send(type(function), specialised, Type). %! classify_class(+ClassName, -Classification) is det. % % Classify an XPCE class. Defined classes are: % % * built_in % * file(File) % * library(File) % * user(File) % * user % * undefined classify_class(Name, built_in) :- get(@classes, member, Name, Class), get(Class, creator, built_in), !. classify_class(Name, library(File)) :- pce_library_class(Name, _, _, FileSpec), FileSpec = library(File), ( get(@classes, member, Name, Class), get(Class, source, source_location(File, _Line)) -> absolute_file_name(FileSpec, File, [ access(read) ]) ; true ), !. classify_class(Name, user(File)) :- get(@classes, member, Name, Class), get(Class, source, source_location(File, _Line)). classify_class(Name, user(File)) :- pce_prolog_class(Name), pce_principal:pce_class(Name, _Meta, _Super, _Vars, _Res, Attributes), memberchk(send(@class, source, source_location(File, _Line)), Attributes), !. classify_class(Name, user) :- get(@classes, member, Name, _), !. classify_class(_, undefined).