1/* Part of SWI-Prolog 2 3 Author: Douglas R. Miles, ... 4 E-mail: logicmoo@gmail.com 5 WWW: http://www.logicmoo.org 6 Copyright (c) 2016-2017, LogicMOO Basic Tools 7 All rights reserved. 8 9 Redistribution and use in source and binary forms, with or without 10 modification, are permitted provided that the following conditions 11 are met: 12 13 1. Redistributions of source code must retain the above copyright 14 notice, this list of conditions and the following disclaimer. 15 16 2. Redistributions in binary form must reproduce the above copyright 17 notice, this list of conditions and the following disclaimer in 18 the documentation and/or other materials provided with the 19 distribution. 20 21 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 29 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 31 ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 POSSIBILITY OF SUCH DAMAGE. 33*/ 34 35:- module(each_call_cleanup, 36 [ 37 each_call_cleanup/3, % +Setup, +Goal, +Cleanup 38 each_call_catcher_cleanup/4, % +Setup, +Goal, ?Catcher, +Cleanup 39 redo_call_cleanup/3, % +Setup, +Goal, +Cleanup 40 trusted_redo_call_cleanup/3 % +Setup, +Goal, +Cleanup 41 ]).

Each call cleanup

Call Setup Goal Cleanup Each Iteration

See also: - https://groups.google.com/forum/#!searchin/comp.lang.prolog/redo_call_cleanup%7Csort:relevance/comp.lang.prolog/frH_4RzMAHg/2bBub5t6AwAJ
*/

51:- meta_predicate 52 redo_call_cleanup(0,0,0), 53 call_then_cut(0), 54 each_call_catcher_cleanup(0,0,?,0), 55 each_call_cleanup(0,0,0), 56 trusted_redo_call_cleanup(0,0,0). 57 58 59 60% call_then_cut(G):- call((G,(deterministic(true)->!;true))) 61 62call_then_cut(G):- 63 prolog_current_choice(CP), 64 prolog_choice_attribute(CP,parent,PC), 65 prolog_choice_attribute(PC,frame,Frame),prolog_frame_attribute(Frame,goal,PG), 66 prolog_choice_attribute(CP,frame,CFrame),prolog_frame_attribute(CFrame,goal,CG),nop(dmsg(call_then_cut(PG,CG))), 67 call((G,(deterministic(true)->prolog_cut_to(PC);true))). 68 69 70 71:- module_transparent(pt1/1). 72:- module_transparent(pt2/1).

80redo_call_cleanup(Setup,Goal,Cleanup):- 81 assertion(each_call_cleanup:unshared_vars(Setup,Goal,Cleanup)), 82 trusted_redo_call_cleanup(Setup,Goal,Cleanup). 83 84trusted_redo_call_cleanup(Setup,Goal,Cleanup):- 85 \+ \+ '$sig_atomic'(Setup), 86 catch( 87 ((Goal, deterministic(DET)), 88 '$sig_atomic'(Cleanup), 89 (DET == true -> ! 90 ; (true;('$sig_atomic'(Setup),fail)))), 91 E, 92 ('$sig_atomic'(Cleanup),throw(E))).

100each_call_catcher_cleanup(Setup, Goal, Catcher, Cleanup):- 101 setup_call_catcher_cleanup(true, 102 each_call_cleanup(Setup, Goal, Cleanup), Catcher, true). 103 104:- thread_local(ecc:'$each_call_cleanup'/2). 105:- thread_local(ecc:'$each_call_undo'/2).

113each_call_cleanup(Setup,Goal,Cleanup):- 114 ((ground(Setup);ground(Cleanup)) -> 115 trusted_redo_call_cleanup(Setup,Goal,Cleanup); 116 setup_call_cleanup( 117 asserta((ecc:'$each_call_cleanup'(Setup,Cleanup)),HND), 118 trusted_redo_call_cleanup(pt1(HND),Goal,pt2(HND)), 119 (pt2(HND),erase(HND)))). 120 121 /******************************* 122 * UTILITIES * 123 *******************************/ 124 125ecc:throw_failure(Why):- throw(error(assertion_error(Why),_)). 126 127pt1(HND) :- 128 clause(ecc:'$each_call_cleanup'(Setup,Cleanup),true,HND) 129 -> 130 ('$sig_atomic'(Setup) -> 131 asserta(ecc:'$each_call_undo'(HND,Cleanup)) ; 132 ecc:throw_failure(failed_setup(Setup))) 133 ; 134 ecc:throw_failure(pt1(HND)). 135 136pt2(HND) :- 137 retract(ecc:'$each_call_undo'(HND,Cleanup)) -> 138 ('$sig_atomic'(Cleanup)->true ;ecc:throw_failure(failed_cleanup(Cleanup))); 139 ecc:throw_failure(failed('$each_call_undo'(HND))). 140 141:- if(true). 142:- system:import(each_call_cleanup/3). 143:- system:import(each_call_catcher_cleanup/4). 144:- system:import(redo_call_cleanup/3). 145:- system:import(pt1/1). 146:- system:import(pt2/1). 147:- endif. 148 149% Only checks for shared vars (not shared structures) 150% @TODO what if someone got tricky with setarging? 151unshared_vars(Setup,_,_):- ground(Setup),!. 152unshared_vars(Setup,Goal,Cleanup):- 153 term_variables(Setup,SVs), 154 term_variables(Cleanup,CVs), 155 ( CVs==[] -> true; unshared_set(SVs,CVs)), 156 term_variables(Goal,GVs), 157 ( GVs==[] -> true; 158 (unshared_set(SVs,GVs), 159 unshared_set(CVs,GVs))). 160 161unshared_set([],_). 162unshared_set([E1|Set1],Set2):- 163 not_in_identical(E1,Set2), 164 unshared_set(Set1,Set2). 165 166not_in_identical(X, [Y|Ys]) :- X \== Y, not_in_identical(X, Ys)