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yap-6.3/Logtalk/examples/roots/initialization.lgt

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:- category(initialization).
:- info([
version is 1.1,
author is 'Paulo Moura',
date is 2000/11/5,
comment is 'Object initialization protocol.']).
:- uses(list).
:- public(init/1).
:- mode(init(+list), zero_or_one).
:- info(init/1,
[comment is 'Intialize an object with the given list of options.',
argnames is ['Options']]).
:- public(valid_init_option/1).
:- mode(valid_init_option(+nonvar), zero_or_one).
:- info(valid_init_option/1,
[comment is 'True if the argument is a valid initialization option.',
argnames is ['Option']]).
:- public(valid_init_options/1).
:- mode(valid_init_options(+list), zero_or_one).
:- info(valid_init_options/1,
[comment is 'True if the argument is list of valid initialization options.',
argnames is ['Options']]).
:- public(default_init_options/1).
:- mode(default_init_options(+list), one).
:- info(default_init_options/1,
[comment is 'List of default initilization options.',
argnames is ['Options']]).
:- public(default_init_option/1).
:- mode(default_init_option(?nonvar), zero_or_more).
:- info(default_init_option/1,
[comment is 'Default initilization option.',
argnames is ['Option']]).
:- protected(process_init_option/1).
:- mode(process_init_option(?nonvar), zero_or_one).
:- info(process_init_option/1,
[comment is 'Process initilization option.',
argnames is ['Option']]).
:- private(process_init_options/1).
:- mode(process_init_options(+list), zero_or_one).
:- info(process_init_options/1,
[comment is 'Process a list of initilization options.',
argnames is ['Options']]).
:- public(free/1).
:- mode(free(+list), zero_or_one).
:- info(free/1,
[comment is 'Release an object with the given list of options.',
argnames is ['Options']]).
:- public(valid_free_option/1).
:- mode(valid_free_option(+nonvar), zero_or_one).
:- info(valid_init_option/1,
[comment is 'True if the argument is a valid delete option.',
argnames is ['Option']]).
:- public(valid_free_options/1).
:- mode(valid_free_options(+list), zero_or_one).
:- info(valid_free_options/1,
[comment is 'True if the argument is list of valid delete options.',
argnames is ['Options']]).
:- public(default_free_options/1).
:- mode(default_free_options(+list), one).
:- info(default_free_options/1,
[comment is 'List of default delete options.',
argnames is ['Options']]).
:- public(default_free_option/1).
:- mode(default_free_option(?nonvar), zero_or_more).
:- info(default_free_option/1,
[comment is 'Default delete option.',
argnames is ['Option']]).
:- protected(process_free_option/1).
:- mode(process_free_option(?nonvar), zero_or_one).
:- info(process_free_option/1,
[comment is 'Process delete option.',
argnames is ['Option']]).
:- private(process_free_options/1).
:- mode(process_free_options(+list), zero_or_one).
:- info(process_free_options/1,
[comment is 'Process a list of delete options.',
argnames is ['Options']]).
:- private(merge_options/3).
:- mode(merge_options(+list, +list, -list), one).
:- info(merge_options/3,
[comment is 'Constructs a complete list of options complementing the explicit options with the default ones.',
argnames is ['Options', 'Defaults', 'Result']]).
init(Options) :-
::valid_init_options(Options),
::default_init_options(Defaults),
::merge_options(Options, Defaults, Options2),
::process_init_options(Options2).
default_init_options(Defaults) :-
findall(Default, ::default_init_option(Default), Defaults).
valid_init_options([]).
valid_init_options([Option| Options]) :-
::valid_init_option(Option),
valid_init_options(Options).
valid_init_option(_).
process_init_options([]).
process_init_options([Option| Options]) :-
once(::process_init_option(Option)),
process_init_options(Options).
process_init_option(Option) :-
self(Self),
sender(Sender),
throw(error(existence_error(predicate_definition), Self::process_init_option(Option), Sender)).
free(Options) :-
::valid_free_options(Options),
::default_free_options(Defaults),
::merge_options(Options, Defaults, Options2),
::process_free_options(Options2).
default_free_options(Defaults) :-
findall(Default, ::default_free_option(Default), Defaults).
valid_free_options([]).
valid_free_options([Option| Options]) :-
::valid_free_option(Option),
valid_free_options(Options).
valid_free_option(_).
process_free_options([]).
process_free_options([Option| Options]) :-
once(::process_free_option(Option)),
process_free_options(Options).
process_free_option(Option) :-
self(Self),
sender(Sender),
throw(error(existence_error(predicate_definition), Self::process_free_option(Option), Sender)).
merge_options([], Defaults, Defaults).
merge_options([Option-Value| Options], Defaults, [Option-Value| Options2]) :-
!,
(list::select(Option-_, Defaults, Defaults2) ->
merge_options(Options, Defaults2, Options2)
;
merge_options(Options, Defaults, Options2)).
merge_options([Option| Options], Defaults, [Option| Options2]) :-
merge_options(Options, Defaults, Options2).
:- end_category.