128 lines
3.4 KiB
Plaintext
128 lines
3.4 KiB
Plaintext
.. default-role:: literal
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Options API Details
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=====================
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:module: :api:`option.py`
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.. _schema:
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Description of Options
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----------------------
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All the constructors take a ``name`` and a ``doc`` argument as first
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arguments to give the option or option group a name and to document it.
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Most constructors take a ``default`` argument that specifies the default
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value of the option. If this argument is not supplied the default value
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is assumed to be ``None``.
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Appart from that, the `Option` object is not supposed to contain any
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other value than the `tainted` attribute, which is explained later. The
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container of the value is in the `Config` object.
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``OptionDescription``
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+++++++++++++++++++++
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This class is used to group suboptions.
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``__init__(self, name, doc, children)``
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``children`` is a list of option descriptions (including
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``OptionDescription`` instances for nested namespaces).
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``set_group_type(self, group_name)``
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Three available group_types : `default`, `family`, `group` and
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`master` (for master~slave group type). Notice that for a
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master~slave group, the name of the group and the name of the
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master option are identical.
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`Options description` objects lives in the `_cfgimpl_descr` config attribute.
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If you need to access an option object, you can do it with the OptionDescription
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object. Not only the value of the option by attribute access, but the option
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object itself that lives behind the scene. It can always be accessed internally
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with the `_cfgimpl_descr` attribute of the `config` objects. For example, with a
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option named `name` in a `gc` group the `name` object can be accessed like
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this::
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conf._cfgimpl_descr.name
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of sub configs with ::
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conf.gc._cfgimpl_descr.name
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This is a binding. The option objects are in the `_children` config's attribute.
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Why accessing an option object ? It is possible for example freeze the
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configuration option
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::
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conf.gc._cfgimpl_descr.dummy.freeze()
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or to hide it, or disable it, or... anything.
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.. _optioninit:
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generic option ``__init__`` method:
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``__init__(name, doc, default=None, requires=None, multi=False, mandatory=False)``
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:``default``: specifies the default value of the option.
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:``requires``: is a list of names of options located anywhere in the configuration.
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:``multi``: means the value can be a list.
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:``mandatory``: see :ref:`glossary#mandatory`.
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.. _optiontype:
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``BoolOption``
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++++++++++++++
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Represents a choice between ``True`` and ``False``.
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``IntOption``
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+++++++++++++
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Represents a choice of an integer.
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``FloatOption``
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+++++++++++++++
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Represents a choice of a floating point number.
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``StrOption``
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+++++++++++++
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Represents the choice of a string.
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``SymLinkOption``
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++++++++++++++++++
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Redirects to another configuration option in the configuration, that is :
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- retrieves the value of the tagert,
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- can set the value of the target too.
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``__init__(self, name, path)``
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`path` is the path to the target, the option
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``IPOption``
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+++++++++++++
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Represents the choice of an ip.
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``NetmaskOption``
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+++++++++++++++++++
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Represents the choice of a netmask.
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``ChoiceOption``
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++++++++++++++++
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Represents a choice out of several objects. The option can also have the value
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``None``.
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``__init__(self, name, doc, values, default=None, requires=None)``
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``values`` is a list of values the option can possibly take.
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