/* Part of XPCE --- The SWI-Prolog GUI toolkit Author: Jan Wielemaker and Anjo Anjewierden E-mail: J.Wielemaker@cs.nu.nl WWW: http://www.swi-prolog.nl/projects/xpce/ Copyright (c) 1985-2011, 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_principal, [ new/2, free/1, send/2, send/3, send/4, send/5, send/6, send/7, send/8, get/3, get/4, get/5, get/6, get/7, get/8, send_class/3, get_class/4, object/1, object/2, pce_class/6, pce_lazy_send_method/3, pce_lazy_get_method/3, pce_uses_template/2, pce_method_implementation/2, pce_open/3, % +Object, +Mode, -Stream in_pce_thread/1, % :Goal set_pce_thread/0, pce_dispatch/0, pce_postscript_stream/1, % -Stream op(200, fy, @), op(250, yfx, ?), op(990, xfx, :=) ]). :- meta_predicate send_class(+, +, :), send(+, :), send(+, :, +), send(+, :, +, +), send(+, :, +, +, +), send(+, :, +, +, +, +), send(+, :, +, +, +, +, +), get_class(+, +, :, -), get(+, :, -), get(+, :, +, -), get(+, :, +, +, -), get(+, :, +, +, +, -), get(+, :, +, +, +, +, -), get(+, :, +, +, +, +, +, -), new(?, :). :- op(100, fx, @). :- op(150, yfx, ?). :- op(990, xfx, :=). /******************************** * HOME * ********************************/ %! pce_home(-Home) is det. % % True when Home is the home directory of XPCE. pce_home(PceHome) :- absolute_file_name(pce('.'), PceHome, [ file_type(directory), file_errors(fail) ]), exists_directory(PceHome), !. pce_home(PceHome) :- getenv('XPCEHOME', PceHome), exists_directory(PceHome), !. pce_home(PceHome) :- ( current_prolog_flag(xpce_version, Version), atom_concat('/xpce-', Version, Suffix) ; Suffix = '/xpce' ), absolute_file_name(swi(Suffix), PceHome, [ file_type(directory), file_errors(fail) ]), exists_directory(PceHome), !. pce_home(PceHome) :- current_prolog_flag(saved_program, true), !, ( current_prolog_flag(home, PceHome) -> true ; current_prolog_flag(executable, Exe) -> file_directory_name(Exe, PceHome) ; PceHome = '.' ). pce_home(_) :- throw(error(pce_error(no_home), _)). /******************************** * LOAD C-PART * ********************************/ init_pce :- catch(load_foreign_library(foreign(pl2xpce)), error(Error, _Context), % suppress stack trace ( print_message(error, error(Error, _)), fail )), pce_home(Home), pce_init(Home), !, create_prolog_flag(xpce, true, []), thread_self(Me), assert(pce:pce_thread(Me)). init_pce :- print_message(error, error(pce_error(init_failed), _)), halt(1). :- initialization(init_pce, now). :- noprofile((send_implementation/3, get_implementation/4, send_class/3, get_class/4, new/2, send/2, get/3)). /******************************** * PROLOG LAYER * ********************************/ %! free(+Ref) is det. % % Delete object if it exists. free(Ref) :- object(Ref), !, send(Ref, free). free(_). %! send(+Object, +Selector, +Arg...) is semidet. % % Succeeds if sending a message to Object with Selector and the % given Arguments succeeds. Normally, goal_expansion/2 expands all % these goals into send(Receiver, Method(Args...)). send(Receiver, M:Selector, A1) :- functor(Message, Selector, 1), arg(1, Message, A1), send(Receiver, M:Message). send(Receiver, M:Selector, A1, A2) :- functor(Message, Selector, 2), arg(1, Message, A1), arg(2, Message, A2), send(Receiver, M:Message). send(Receiver, M:Selector, A1, A2, A3) :- functor(Message, Selector, 3), arg(1, Message, A1), arg(2, Message, A2), arg(3, Message, A3), send(Receiver, M:Message). send(Receiver, M:Selector, A1, A2, A3, A4) :- functor(Message, Selector, 4), arg(1, Message, A1), arg(2, Message, A2), arg(3, Message, A3), arg(4, Message, A4), send(Receiver, M:Message). send(Receiver, M:Selector, A1, A2, A3, A4, A5) :- functor(Message, Selector, 5), arg(1, Message, A1), arg(2, Message, A2), arg(3, Message, A3), arg(4, Message, A4), arg(5, Message, A5), send(Receiver, M:Message). send(Receiver, M:Selector, A1, A2, A3, A4, A5, A6) :- functor(Message, Selector, 6), arg(1, Message, A1), arg(2, Message, A2), arg(3, Message, A3), arg(4, Message, A4), arg(5, Message, A5), arg(6, Message, A6), send(Receiver, M:Message). %! get(+Object, :Selector, +Arg..., ?Rval) is semidet. % % See the comments with send/[3-12]. get(Receiver, M:Selector, A1, Answer) :- functor(Message, Selector, 1), arg(1, Message, A1), get(Receiver, M:Message, Answer). get(Receiver, M:Selector, A1, A2, Answer) :- functor(Message, Selector, 2), arg(1, Message, A1), arg(2, Message, A2), get(Receiver, M:Message, Answer). get(Receiver, M:Selector, A1, A2, A3, Answer) :- functor(Message, Selector, 3), arg(1, Message, A1), arg(2, Message, A2), arg(3, Message, A3), get(Receiver, M:Message, Answer). get(Receiver, M:Selector, A1, A2, A3, A4, Answer) :- functor(Message, Selector, 4), arg(1, Message, A1), arg(2, Message, A2), arg(3, Message, A3), arg(4, Message, A4), get(Receiver, M:Message, Answer). get(Receiver, M:Selector, A1, A2, A3, A4, A5, Answer) :- functor(Message, Selector, 5), arg(1, Message, A1), arg(2, Message, A2), arg(3, Message, A3), arg(4, Message, A4), arg(5, Message, A5), get(Receiver, M:Message, Answer). /******************************* * NEW SEND * *******************************/ :- multifile send_implementation/3, get_implementation/4. %! send_implementation(+Id, +Message, +Object) % % Method-bodies are compiled into clauses for this predicate. Id % is a unique identifier for the implementation, Message is a % compound whose functor is the method name and whose arguments % are the arguments to the method-call. Object is the receiving % object. send_implementation(true, _Args, _Obj). send_implementation(fail, _Args, _Obj) :- fail. send_implementation(once(Id), Args, Obj) :- send_implementation(Id, Args, Obj), !. send_implementation(spy(Id), Args, Obj) :- ( current_prolog_flag(debug, true) -> trace, send_implementation(Id, Args, Obj) ; send_implementation(Id, Args, Obj) ). send_implementation(trace(Id), Args, Obj) :- pce_info(pce_trace(enter, send_implementation(Id, Args, Obj))), ( send_implementation(Id, Args, Obj) -> pce_info(pce_trace(exit, send_implementation(Id, Args, Obj))) ; pce_info(pce_trace(fail, send_implementation(Id, Args, Obj))) ). %! get_implementation(+Id, +Message, +Object, -Return) % % As send_implementation/3, but for get-methods. get_implementation(true, _Args, _Obj, _Rval). get_implementation(fail, _Args, _Obj, _Rval) :- fail. get_implementation(once(Id), Args, Obj, Rval) :- get_implementation(Id, Args, Obj, Rval), !. get_implementation(spy(Id), Args, Obj, Rval) :- ( current_prolog_flag(debug, true) -> trace, get_implementation(Id, Args, Obj, Rval) ; get_implementation(Id, Args, Obj, Rval) ). get_implementation(trace(Id), Args, Obj, Rval) :- pce_info(pce_trace(enter, get_implementation(Id, Args, Obj, Rval))), ( get_implementation(Id, Args, Obj, Rval) -> pce_info(pce_trace(exit, get_implementation(Id, Args, Obj, Rval))) ; pce_info(pce_trace(fail, get_implementation(Id, Args, Obj, Rval))), fail ). % SWI-Prolog: make this a normal user (debug-able) predicate. pce_ifhostproperty(prolog(swi), [ (:- unlock_predicate(send_implementation/3)), (:- unlock_predicate(get_implementation/4)), (:- '$set_predicate_attribute'(send_implementation(_,_,_), hide_childs, false)), (:- '$set_predicate_attribute'(get_implementation(_,_,_,_), hide_childs, false)) ]). /******************************* * DECLARATIONS * *******************************/ :- multifile pce_class/6, pce_lazy_send_method/3, pce_lazy_get_method/3, pce_uses_template/2. /******************************* * @PROLOG * *******************************/ :- initialization (object(@prolog) -> true ; send(@host, name_reference, prolog)).