590 lines
26 KiB
Prolog
590 lines
26 KiB
Prolog
%%% -*- Mode: Prolog; -*-
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/**
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* @file library/flags.yap
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* @author Theofrastos Mantadelis, Bernd Gutmann, Paulo Moura
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* @date Tue Nov 17 15:18:02 2015
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*
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* @brief Flag Manipulation in Prolog
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*
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*
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*/
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% Flags was developed at Katholieke Universiteit Leuven
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%
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% Copyright 2010
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% Katholieke Universiteit Leuven
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%
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% Contributions to this file:
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% Author: Theofrastos Mantadelis
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% Sugestions: Bernd Gutmann, Paulo Moura
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% $Date: 2011-02-15 13:33:01 +0100 (Tue, 15 Feb 2011) $
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% $Revision: 15 $
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%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% Artistic License 2.0
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%
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% Copyright (c) 2000-2006, The Perl Foundation.
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%
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% Everyone is permitted to copy and distribute verbatim copies of this
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% license document, but changing it is not allowed. Preamble
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%
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% This license establishes the terms under which a given free software
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% Package may be copied, modified, distributed, and/or
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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:- module(flags, [flag_define/2,
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flag_define/5,
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flag_define/7,
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flag_set/2,
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flag_set/3,
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flag_unsafe_set/2,
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flag_get/2,
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flags_reset/0,
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flags_reset/1,
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flags_save/1,
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flags_load/1,
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flag_groups/1,
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flag_group_chk/1,
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flag_help/0,
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flags_print/0,
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defined_flag/7]).
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/**
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* @defgroup flags Flag Manipulation in Prolog
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* @ingroup library
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*
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* Routines to manipulate flags: they allow defining, set,
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* resetting.
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* @{
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*/
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:- use_module(library(lists), [append/3, memberchk/2, member/2]).
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:- style_check(all).
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:- yap_flag(unknown, error).
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:- dynamic(['$defined_flag$'/7, '$store_flag_value$'/2]).
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:- meta_predicate(flag_define(+, +, +, ?, ?, ?, :)).
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:- meta_predicate(flag_define(+, :)).
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:- meta_predicate(validate(+, :, ?, +)).
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:- multifile(flags_type_definition/3).
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flag_define(FlagName, InputOptions):-
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strip_module(InputOptions, Module, UserOptions),
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Defaults = [flag_group(general), flag_type(nonvar), default_value(true), description(FlagName), access(read_write), handler(true)],
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append(UserOptions, Defaults, Options),
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memberchk(flag_group(FlagGroup), Options),
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memberchk(flag_type(FlagType), Options),
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memberchk(default_value(DefaultValue), Options),
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memberchk(description(Description), Options),
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memberchk(access(Access), Options),
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memberchk(handler(Handler), Options),
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flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler).
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flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description):-
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flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, read_write, true).
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flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, MHandler):-
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strip_module(MHandler, Module, Handler),
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nonvar(FlagName),
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nonvar(FlagGroup),
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nonvar(FlagType),
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nonvar(Access),
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nonvar(Handler), !,
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(\+ atom(FlagName) ->
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throw(error(type_error(atom, FlagName), message('Flag name needs to be an atom.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler))))
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; \+ atom(FlagGroup) ->
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throw(error(type_error(atom, FlagGroup), message('Flag group needs to be an atom.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler))))
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; \+ flag_type(FlagType) ->
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throw(error(domain_error(flag_type, FlagType), message('Unknown flag type.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Module:Handler))))
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; \+ validate_type(FlagType) ->
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throw(error(evaluation_error(type_validation), message('Validation of flag type failed, check custom domain.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler))))
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; '$defined_flag$'(FlagName, _FlagGroup, _FlagType, _DefaultValue, _Description, _Access, _Handler) ->
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throw(error(permission_error(create, flag, FlagName), message('Re-defining a flag is not allowed.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler))))
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; \+ memberchk(Access, [read_write, read_only, hidden, hidden_read_only]),
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throw(error(domain_error(access, Access), message('Wrong access attribute, available are: read_write, read_only, hidden, hidden_read_only.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler))))
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; \+ callable(Handler) -> % the Handler comes from: strip_module(MHandler, Module, Handler)
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throw(error(type_error(callable, Handler), message('Flag handler needs to be callable.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler))))
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;
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validate(FlagType, Module:Handler, DefaultValue, FlagName),
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assertz('$defined_flag$'(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Module:Handler)),
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assertz('$store_flag_value$'(FlagName, DefaultValue)),
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(Handler == true ->
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true
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;
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call(Module:Handler, stored, DefaultValue)
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)
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).
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flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Handler):-
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throw(error(instantiation_error, message('Flag name, group, type, access and handler need to be instantiated.', flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Handler)))).
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flag_groups(FlagGroups):-
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all(FlagGroup, ('$defined_flag$'(_FlagName, FlagGroup, _FlagType, _DefaultValue, _Description, Access, _Handler), Access \== hidden, Access \== hidden_read_only), FlagGroups).
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flag_group_chk(FlagGroup):-
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nonvar(FlagGroup),
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'$defined_flag$'(_FlagName, FlagGroup, _FlagType, _DefaultValue, _Description, _Access, _Handler), !.
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flag_type(Type):-
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flags_type_definition(Type, _, _).
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% flags_type_definition(TypeName, TypeHandler, TypeValidator).
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flags_type_definition(nonvar, nonvar, true).
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flags_type_definition(atom, atom, true).
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flags_type_definition(atomic, atomic, true).
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flags_type_definition(integer, integer, true).
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flags_type_definition(float, float, true).
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flags_type_definition(number, number, true).
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flags_type_definition(ground, ground, true).
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flags_type_definition(compound, compound, true).
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flags_type_definition(is_list, is_list, true).
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flags_type_definition(callable, callable, true).
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flags_type_definition(in_interval(Type, Interval), in_interval(Type, Interval), in_interval(Type, Interval)).
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flags_type_definition(integer_in_interval(Interval), in_interval(integer, Interval), in_interval(integer, Interval)).
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flags_type_definition(positive_integer, in_interval(integer, (0, (+inf))), true).
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flags_type_definition(non_negative_integer, in_interval(integer, ([0], (+inf))), true).
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flags_type_definition(negative_integer, in_interval(integer, ((-inf), 0)), true).
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flags_type_definition(float_in_interval(Interval), in_interval(float, Interval), in_interval(float, Interval)).
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flags_type_definition(positive_float, in_interval(float, (0.0, (+inf))), true).
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flags_type_definition(non_negative_float, in_interval(float, ([0.0], (+inf))), true).
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flags_type_definition(negative_float, in_interval(float, ((-inf), 0.0)), true).
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flags_type_definition(number_in_interval(Interval), in_interval(number, Interval), in_interval(number, Interval)).
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flags_type_definition(positive_number, in_interval(number, (0.0, (+inf))), true).
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flags_type_definition(non_negative_number, in_interval(number, ([0.0], (+inf))), true).
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flags_type_definition(negative_number, in_interval(number, ((-inf), 0.0)), true).
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flags_type_definition(in_domain(Domain), in_domain(Domain), in_domain(Domain)).
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flags_type_definition(boolean, in_domain([true, false]), true).
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flags_type_definition(switch, in_domain([on, off]), true).
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in_domain(Domain):-
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ground(Domain),
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is_list(Domain).
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in_domain(Domain, Value):-
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ground(Value),
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memberchk(Value, Domain).
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in_interval(Type, Interval):-
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is_list(Interval), !,
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Interval \== [],
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in_interval_conj(Type, Interval).
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in_interval(Type, Interval):-
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in_interval_single(Type, Interval).
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in_interval_conj(_Type, []).
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in_interval_conj(Type, [Interval|Rest]):-
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in_interval_single(Type, Interval),
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in_interval_conj(Type, Rest).
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in_interval_single(Type, ([Min], [Max])):-
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!, call(Type, Min),
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call(Type, Max),
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Min =< Max.
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in_interval_single(Type, ([Min], Max)):-
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!, call(Type, Min),
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type_or_inf(Type, Max),
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Min < Max.
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in_interval_single(Type, (Min, [Max])):-
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!, type_or_inf(Type, Min),
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call(Type, Max),
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Min < Max.
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in_interval_single(Type, (Min, Max)):-
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type_or_inf(Type, Min),
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type_or_inf(Type, Max),
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Min < Max,
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Max - Min > 0.0.
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type_or_inf(Type, Value):-
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nonvar(Type), nonvar(Value),
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Value == (+inf), !.
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type_or_inf(Type, Value):-
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nonvar(Type), nonvar(Value),
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Value == (-inf), !.
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type_or_inf(Type, Value):- call(Type, Value).
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in_interval(Type, [Interval|_Rest], Value):-
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in_interval(Type, Interval, Value), !.
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in_interval(Type, [_Interval|Rest], Value):-
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in_interval(Type, Rest, Value).
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in_interval(Type, ([Min], [Max]), Value):-
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!, call(Type, Value),
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Value >= Min,
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Value =< Max.
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in_interval(Type, ([Min], Max), Value):-
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!, call(Type, Value),
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Value >= Min,
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Value < Max.
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in_interval(Type, (Min, [Max]), Value):-
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!, call(Type, Value),
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Value > Min,
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Value =< Max.
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in_interval(Type, (Min, Max), Value):-
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call(Type, Value),
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Value > Min,
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Value < Max.
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validate_type(Type):-
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flags_type_definition(Type, _, TypeValidater),
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call(TypeValidater).
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validate(FlagType, Handler, Value, FlagName):-
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strip_module(Handler, _Module, true),
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!, flags_type_definition(FlagType, FlagValidator, _),
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(call(FlagValidator, Value) ->
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true
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;
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throw(error(validation_error(FlagType, Value), message('Validation of value fails.', validate(FlagType, Value, FlagName))))
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).
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validate(FlagType, Handler, Value, FlagName):-
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flags_type_definition(FlagType, FlagValidator, _),
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((call(Handler, validating, Value), (call(FlagValidator, Value); call(Handler, validate, Value))) ->
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call(Handler, validated, Value)
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;
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throw(error(validation_error(FlagType, Value), message('Validation of value fails.', validate(FlagType, Handler, Value, FlagName))))
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).
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flag_set(FlagName, FlagValue):-
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flag_set(FlagName, _OldValue, FlagValue).
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flag_set(FlagName, OldValue, FlagValue):-
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atom(FlagName),
|
||
'$defined_flag$'(FlagName, _FlagGroup, FlagType, _DefaultValue, _Description, Access, Module:Handler), !,
|
||
(Access \== read_only, Access \== hidden_read_only ->
|
||
validate(FlagType, Module:Handler, FlagValue, FlagName),
|
||
retract('$store_flag_value$'(FlagName, OldValue)),
|
||
assertz('$store_flag_value$'(FlagName, FlagValue)),
|
||
(Handler == true ->
|
||
true
|
||
;
|
||
call(Module:Handler, stored, FlagValue)
|
||
)
|
||
;
|
||
throw(error(permission_error(set, flag, FlagName), message('Setting the flag value is not allowed.',flag_set(FlagName, OldValue, FlagValue))))
|
||
).
|
||
flag_set(FlagName, OldValue, FlagValue):-
|
||
throw(error(existence_error(flag, FlagName), message('The flag is not defined.', flag_set(FlagName, OldValue, FlagValue)))).
|
||
|
||
flag_unsafe_set(FlagName, FlagValue):-
|
||
retract('$store_flag_value$'(FlagName, _)),
|
||
assertz('$store_flag_value$'(FlagName, FlagValue)).
|
||
|
||
flag_get(FlagName, FlagValue):-
|
||
\+ '$store_flag_value$'(FlagName, _),
|
||
throw(error(existence_error(flag, FlagName), message('The flag is not defined.', flag_get(FlagName, FlagValue)))).
|
||
flag_get(FlagName, FlagValue):-
|
||
'$store_flag_value$'(FlagName, FlagValue).
|
||
|
||
flags_reset:-
|
||
retractall('$store_flag_value$'(_, _)),
|
||
'$defined_flag$'(FlagName, _FlagGroup, _FlagType, DefaultValue, _Description, _Access, Module:Handler),
|
||
assertz('$store_flag_value$'(FlagName, DefaultValue)),
|
||
(Handler == true ->
|
||
true
|
||
;
|
||
call(Module:Handler, stored, DefaultValue)
|
||
),
|
||
fail.
|
||
flags_reset.
|
||
|
||
flags_reset(FlagGroup):-
|
||
'$defined_flag$'(FlagName, FlagGroup, _FlagType, DefaultValue, _Description, _Access, Module:Handler),
|
||
retractall('$store_flag_value$'(FlagName, _)),
|
||
assertz('$store_flag_value$'(FlagName, DefaultValue)),
|
||
(Handler == true ->
|
||
true
|
||
;
|
||
call(Module:Handler, stored, DefaultValue)
|
||
),
|
||
fail.
|
||
flags_reset(_).
|
||
|
||
flags_save(FileName):-
|
||
tell(FileName),
|
||
catch(('$store_flag_value$'(FlagName, Value),
|
||
write_canonical('$store_flag_value$'(FlagName, Value)),
|
||
write('.'), nl),
|
||
Exception, clean_and_throw(told, Exception)),
|
||
fail.
|
||
flags_save(_FileName):-
|
||
told.
|
||
|
||
flags_load(FileName):-
|
||
see(FileName),
|
||
catch((read('$store_flag_value$'(FlagName, Value)),
|
||
flag_set(FlagName, Value)),
|
||
Exception, clean_and_throw(seen, Exception)),
|
||
fail.
|
||
flags_load(_FileName):-
|
||
seen.
|
||
|
||
clean_and_throw(Action, Exception):-
|
||
Action,
|
||
throw(Exception).
|
||
|
||
flag_help:-
|
||
format('This is a short tutorial for the flags library.~nExported predicates:~n'),
|
||
format(' flag_define/5 : defines a new flag without a handler~n'),
|
||
format(' flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description)~n'),
|
||
format(' flag_define/6 : defines a new flag with a handler~n'),
|
||
format(' flag_define(FlagName, FlagGroup, FlagType, DefaultValue, Description, Handler)~n'),
|
||
format(' FlagName : the name of the flag~n'),
|
||
format(' FlagGroup : the name of the flag group~n'),
|
||
format(' FlagType : the type of the flag available types are:~n'),
|
||
flag_help_types,
|
||
format(' DefaultValue : the default value for the flag~n'),
|
||
format(' Description : a flag description~n'),
|
||
format(' Handler : a handler~n'),
|
||
flags:flag_help_handler,
|
||
format(' flag_groups/1 : returns all the flag groups in a list~n'),
|
||
format(' flag_group_chk/1 : checks if a group exists~n'),
|
||
format(' flag_set/2 : sets the value of a flag~n'),
|
||
format(' flag_get/2 : gets the value of a flag~n'),
|
||
format(' flag_store/2 : sets the value of a flag ignoring all tests and handlers~n'),
|
||
format(' flag_reset/0 : resets all flags to their default value~n'),
|
||
format(' flag_reset/1 : resets all flags of a group to their default value~n'),
|
||
format(' flag_help/0 : this screen~n'),
|
||
format(' flags_print/0 : shows the current flags/values~n').
|
||
flag_help_types:-
|
||
flag_type(FlagType),
|
||
format(' ~w~n', [FlagType]),
|
||
fail.
|
||
flag_help_types.
|
||
|
||
flag_help_handler:-
|
||
format(' Handler important notes:~n'),
|
||
format(' Conjuction: external_handler(validating, Value):-...~n'),
|
||
format(' Disjunction: external_handler(validate, Value):-...~n'),
|
||
format(' After: external_handler(validated, Value):-...~n'),
|
||
format(' After set: external_handler(stored, Value):-...~n'),
|
||
format(' this is implemented as (validating,(original;validated))~n'),
|
||
format(' validating|original|validate|result~n'),
|
||
format(' true | true | true | true~n'),
|
||
format(' true | true | fail | true~n'),
|
||
format(' true | fail | true | true~n'),
|
||
format(' true | fail | fail | fail~n'),
|
||
format(' fail | true | true | fail~n'),
|
||
format(' fail | true | fail | fail~n'),
|
||
format(' fail | fail | true | fail~n'),
|
||
format(' fail | fail | fail | fail~n'),
|
||
format(' Default behaviour is validating->true, validate->fail~n'),
|
||
format(' To completly replace original set validate->true~n'),
|
||
format(' To add new values to original set validating->true~n'),
|
||
format(' To remove values from original set validate->fail~n'),
|
||
format(' Example definition with a handler:~n'),
|
||
format(' flag_define(myflag, mygroup, in_interval(integer, [(-5, 5),([15],[25])]), 0, description, my_handler).~n'),
|
||
format(' my_handler(validate, Value):-Value is 10.~n'),
|
||
format(' my_handler(validating, Value).~n'),
|
||
format(' my_handler(validated, Value).~n'),
|
||
format(' my_handler(stored, Value).~n'),
|
||
format(' This has defined a flag that accepts integers (-5,5)v[15,25].~n'),
|
||
format(' The handler adds the value 10 in those.~n').
|
||
|
||
flags_print:-
|
||
flag_groups(Groups),
|
||
forall(member(Group, Groups), flags_print(Group)).
|
||
flags_print(Group):-
|
||
format(' ~w:~n~w~38+ ~w~19+ ~w~10+ ~w~10+~n', [Group, 'Description', 'Domain', 'Flag', 'Value']),
|
||
fail.
|
||
flags_print(FlagGroup):-
|
||
'$defined_flag$'(FlagName, FlagGroup, FlagType, _DefaultValue, Description, Access, _Handler),
|
||
Access \== hidden, Access \== hidden_read_only,
|
||
flag_get(FlagName, Value),
|
||
format('~w~38+ ~w~19+ ~w~10+ ~q~10+~n', [Description, FlagType, FlagName, Value]),
|
||
fail.
|
||
flags_print(_).
|
||
|
||
defined_flag(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Handler):-
|
||
'$defined_flag$'(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Handler),
|
||
Access \== hidden, Access \== hidden_read_only.
|
||
defined_flag(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Handler):-
|
||
nonvar(FlagName), nonvar(FlagGroup),
|
||
'$defined_flag$'(FlagName, FlagGroup, FlagType, DefaultValue, Description, Access, Handler).
|
||
|
||
%% @}
|