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.. index:: options_protocol .. _options_protocol/0:
.. rst-class:: right
protocol
options_protocol
Options protocol.
| Availability:
| logtalk_load(options(loader))
| Author: Paulo Moura | Version: 1:2:0 | Date: 2022-01-03
| Compilation flags:
| static
| Dependencies: | (none)
| Remarks: | (none)
| Inherited public predicates: | (none)
.. contents:: :local: :backlinks: top
Public predicates
.. index:: check_option/1 .. _options_protocol/0::check_option/1:
check_option/1 ^^^^^^^^^^^^^^^^^^
Succeeds if the option is valid. Throws an error otherwise.
| Compilation flags:
| static
| Template:
| check_option(Option)
| Mode and number of proofs:
| check_option(@term) - one_or_error
| Exceptions:
| Option is a variable:
| instantiation_error
| Option is neither a variable nor a compound term:
| type_error(compound,Option)
| Option is a compound term but not a valid option:
| domain_error(option,Option)
.. index:: check_options/1 .. _options_protocol/0::check_options/1:
check_options/1 ^^^^^^^^^^^^^^^^^^^
Succeeds if all the options in a list are valid. Throws an error otherwise.
| Compilation flags:
| static
| Template:
| check_options(Options)
| Mode and number of proofs:
| check_options(@term) - one_or_error
| Exceptions:
| Options is a variable:
| instantiation_error
| Options is neither a variable nor a list:
| type_error(list,Options)
| An element Option of the list Options is a variable:
| instantiation_error
| An element Option of the list Options is neither a variable nor a compound term:
| type_error(compound,Option)
| An element Option of the list Options is a compound term but not a valid option:
| domain_error(option,Option)
.. index:: valid_option/1 .. _options_protocol/0::valid_option/1:
valid_option/1 ^^^^^^^^^^^^^^^^^^
Succeeds if the option is valid.
| Compilation flags:
| static
| Template:
| valid_option(Option)
| Mode and number of proofs:
| valid_option(@term) - zero_or_one
.. index:: valid_options/1 .. _options_protocol/0::valid_options/1:
valid_options/1 ^^^^^^^^^^^^^^^^^^^
Succeeds if all the options in a list are valid.
| Compilation flags:
| static
| Template:
| valid_options(Options)
| Mode and number of proofs:
| valid_options(@term) - one
.. index:: default_option/1 .. _options_protocol/0::default_option/1:
default_option/1 ^^^^^^^^^^^^^^^^^^^^
Enumerates, by backtracking, the default options.
| Compilation flags:
| static
| Template:
| default_option(Option)
| Mode and number of proofs:
| default_option(?compound) - zero_or_more
.. index:: default_options/1 .. _options_protocol/0::default_options/1:
default_options/1 ^^^^^^^^^^^^^^^^^^^^^
Returns a list of the default options.
| Compilation flags:
| static
| Template:
| default_options(Options)
| Mode and number of proofs:
| default_options(-list(compound)) - one
.. index:: option/2 .. _options_protocol/0::option/2:
option/2 ^^^^^^^^^^^^
True iff Option unifies with the first occurrence of the same option in the Options list.
| Compilation flags:
| static
| Template:
| option(Option,Options)
| Mode and number of proofs:
| option(+compound,+list(compound)) - zero_or_one
.. index:: option/3 .. _options_protocol/0::option/3:
option/3 ^^^^^^^^^^^^
True iff Option unifies with the first occurrence of the same option in the Options list or, when that is not the case, if Option unifies with Default.
| Compilation flags:
| static
| Template:
| option(Option,Options,Default)
| Mode and number of proofs:
| option(+compound,+list(compound),+compound) - zero_or_one
Protected predicates
.. index:: merge_options/2 .. _options_protocol/0::merge_options/2:
merge_options/2 ^^^^^^^^^^^^^^^^^^^
Merges the user options with the default options, returning the final list of options. Calls the fix_options/2 predicate to preprocess the options after merging. Callers must ensure, if required, that the user options are valid.
| Compilation flags:
| static
| Template:
| merge_options(UserOptions,Options)
| Mode and number of proofs:
| merge_options(+list(compound),-list(compound)) - one
.. index:: fix_options/2 .. _options_protocol/0::fix_options/2:
fix_options/2 ^^^^^^^^^^^^^^^^^
Fixes a list of options, returning the list of options.
| Compilation flags:
| static
| Template:
| fix_options(Options,FixedOptions)
| Mode and number of proofs:
| fix_options(+list(compound),-list(compound)) - one
.. index:: fix_option/2 .. _options_protocol/0::fix_option/2:
fix_option/2 ^^^^^^^^^^^^^^^^
Fixes an option.
| Compilation flags:
| static
| Template:
| fix_option(Option,FixedOption)
| Mode and number of proofs:
| fix_option(+compound,-compound) - zero_or_one
Private predicates
(none)
Operators
(none)
.. seealso::
:ref:`options <options/0>`