automatic API documentation

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gwen 2013-08-23 11:42:22 +02:00
parent 0db7ef72a6
commit f235986879
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.. default-role:: literal .. default-role:: literal
=============================== ===============================
Configuration handling basics Options handling basics
=============================== ===============================
Tiramisu is made of almost three main objects : Tiramisu is made of almost three main objects :
@ -10,8 +10,8 @@ Tiramisu is made of almost three main objects :
- :class:`tiramisu.option.Option` stands for the option types - :class:`tiramisu.option.Option` stands for the option types
- :class:`tiramisu.option.OptionDescription` is the shema, the option's structure - :class:`tiramisu.option.OptionDescription` is the shema, the option's structure
Accessing the configuration `Option`'s Accessing the `Option`'s
----------------------------------------- -------------------------
The `Config` object attribute access notation stands for the value of the The `Config` object attribute access notation stands for the value of the
configuration's `Option`. That is, the `Config`'s object attribute is the name configuration's `Option`. That is, the `Config`'s object attribute is the name
@ -41,11 +41,10 @@ object is returned, and if no `Option` has been declared in the
>>> cfg.idontexist >>> cfg.idontexist
AttributeError: 'OptionDescription' object has no attribute 'idontexist' AttributeError: 'OptionDescription' object has no attribute 'idontexist'
The configuration `Option` objects (in this case the `BoolOption`), are The `Option` objects (in this case the `BoolOption`), are organized into a tree
organized into a tree into nested `OptionDescription` objects. Every into nested `OptionDescription` objects. Every option has a name, as does every
option has a name, as does every option group. The parts of the full option group. The parts of the full name of the option are separated by dots:
name of the option are separated by dots: e.g. e.g. ``cfg.optgroup.optname``.
``config.optgroup.optname``.
Let's make the protocol of accessing a config's attribute explicit Let's make the protocol of accessing a config's attribute explicit
(because explicit is better than implicit): (because explicit is better than implicit):
@ -61,10 +60,10 @@ Let's make the protocol of accessing a config's attribute explicit
4. If an option is declared, and a value has been set, the returned value is 4. If an option is declared, and a value has been set, the returned value is
the value of the option. the value of the option.
But there are special exceptions. We will see later on that an option can be a But there are special exceptions. We will see later on that an option can be a
:term:`mandatory option`. A mandatory option is an option that must have a defined value. :term:`mandatory option`. A mandatory option is an option that must have a defined value.
If no value have been set yet, the value is `None`. If no value have been set yet, the value is `None`.
When the option is called to retrieve a value, an exception is raised. When the option is called to retrieve a value, an exception is raised.
What if a value has been set and `None` is to be returned again ? Don't What if a value has been set and `None` is to be returned again ? Don't
worry, an option value can be "reseted" with the help of the `option.Option.reset()` worry, an option value can be "reseted" with the help of the `option.Option.reset()`
@ -106,6 +105,63 @@ bundled into a configuration object which has a reference to its option
description (and therefore makes sure that the configuration values description (and therefore makes sure that the configuration values
adhere to the option description). adhere to the option description).
Common manipulations
------------------------
Let's perform some common manipulation on some options:
>>> from tiramisu.config import Config
>>> from tiramisu.option import UnicodeOption, OptionDescription
>>>
>>> var1 = UnicodeOption('var1', 'first variable')
>>> var2 = UnicodeOption('var2', '', u'value')
>>>
>>> od1 = OptionDescription('od1', 'first OD', [var1, var2])
>>> rootod = OptionDescription('rootod', '', [od1])
let's set somme access rules on the main namespace
>>> c = Config(rootod)
>>> c.read_write()
let's travel the namespaces
>>> print c
[od1]
>>> print c.od1
var1 = None
var2 = value
>>> print c.od1.var1
None
>>> print c.od1.var2
value
let's modify a value (careful to the value's type...)
>>> c.od1.var1 = 'value'
Traceback (most recent call last):
[...]
ValueError: invalid value value for option var1
>>> c.od1.var1 = u'value'
>>> print c.od1.var1
value
>>> c.od1.var2 = u'value2'
>>> print c.od1.var2
value2
let's come back to the default value
>>> del(c.od1.var2)
>>> print c.od1.var2
value
The value is saved in a :class:`~tiramisu.value.Value` object.
It is on this object that we have to trigger the `reset`
Configuration's interesting methods Configuration's interesting methods
------------------------------------------ ------------------------------------------
@ -123,11 +179,11 @@ Here are the (useful) methods on ``Config`` (or `SubConfig`).
:members: find, find_first, __iter__, iter_groups, iter_all, make_dict :members: find, find_first, __iter__, iter_groups, iter_all, make_dict
.. automethod:: __init__ .. automethod:: __init__
.. rubric:: Summary .. rubric:: Summary
.. autosummary:: .. autosummary::
find find
find_first find_first
@ -139,10 +195,10 @@ Here are the (useful) methods on ``Config`` (or `SubConfig`).
.. rubric:: Methods .. rubric:: Methods
A :class:`~config.CommonConfig` is a abstract base class. A A :class:`~config.CommonConfig` is a abstract base class. A
:class:`~config.SubConfig` is an just in time created objects that wraps an :class:`~config.SubConfig` is an just in time created objects that wraps an
::class:`~option.OptionDescription`. A SubConfig differs from a Config in the ::class:`~option.OptionDescription`. A SubConfig differs from a Config in the
::fact that a config is a root object and has an environnement, a context wich ::fact that a config is a root object and has an environnement, a context wich
::defines the different properties, access rules, vs... There is generally only ::defines the different properties, access rules, vs... There is generally only
::one Config, and many SubConfigs. ::one Config, and many SubConfigs.

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@ -5,22 +5,22 @@ Getting started
What is options handling ? What is options handling ?
================================= =================================
Due to more and more available options required to set up an operating system, Due to more and more available options required to set up an operating system,
to set up compiler options, vs... it became quite annoying to hand the to set up compiler options, vs... it became quite annoying to hand the
necessary options to where they are actually used and even more annoying to add necessary options to where they are actually used and even more annoying to add
new options. To circumvent these problems the configuration management was new options. To circumvent these problems the configuration management was
introduced... introduced...
What is Tiramisu ? What is Tiramisu ?
=================== ===================
Tiramisu is an options handler and an options controller, wich aims at Tiramisu is an options handler and an options controller, wich aims at
producing flexible and fast options access. The main advantages are its access producing flexible and fast options access. The main advantages are its access
rules and the fact that the whole consistency is preserved at any time, see rules and the fact that the whole consistency is preserved at any time, see
:doc:`consistency`. There is of course type and structure validations, but also :doc:`consistency`. There is of course type and structure validations, but also
validations towards the whole options. validations towards the whole options.
Last but not least, options can be reached and changed according to the access Last but not least, options can be reached and changed according to the access
rules from nearly everywhere in your appliance. rules from nearly everywhere in your appliance.
Just the facts Just the facts
@ -31,21 +31,21 @@ Just the facts
Download Download
--------- ---------
To obtain a copy of the sources, check it out from the repository using `git`. To obtain a copy of the sources, check it out from the repository using `git`.
We suggest using `git` if one wants to access the current developments. We suggest using `git` if one wants to access the current developments.
:: ::
git clone git://git.labs.libre-entreprise.org/tiramisu.git git clone git://git.labs.libre-entreprise.org/tiramisu.git
This will get you a fresh checkout of the code repository in a local directory This will get you a fresh checkout of the code repository in a local directory
named ``tiramisu``. named ``tiramisu``.
Getting started Getting started
------------------- -------------------
Option objects can be created in different ways. Let's perform very basic Option objects can be created in different ways. Let's perform very basic
:class:`~tiramisu.option.Option` and :class:`~tiramisu.config.Config` object :class:`~tiramisu.option.Option` and :class:`~tiramisu.config.Config` object
manipulations: manipulations:
:: ::
@ -55,22 +55,26 @@ manipulations:
>>> descr = OptionDescription("optgroup", "", [ >>> descr = OptionDescription("optgroup", "", [
... BoolOption("bool", "", default=False)]) ... BoolOption("bool", "", default=False)])
>>> >>>
>>> config = Config(descr) >>> c = Config(descr)
>>> # now we have a config, wich contains an option: >>> # now we have a container, wich contains an option:
>>> config.bool >>> c.bool
False False
>>> config.bool = True >>> c.bool = True
>>> config.bool >>> c.bool
True True
So by now, we have So by now, we have
- a namespace (which is `config` here) - a namespace (which is `c` here)
- the access of an option's value by the - the access of an option's value by the
attribute access way (here `bool`, wich is a boolean option: attribute access way (here `bool`, wich is a boolean option:
:class:`tiramisu.option.BoolOption()`. :class:`~tiramisu.option.BoolOption()`.
So, option objects are produced at the entry point and then handed down to So, option objects are produced at the entry point and then handed down to
where they are actually used. This keeps options local but available everywhere where they are actually used. This keeps options local but available everywhere
and consistent. and consistent.
The namespace is created, we can set a `read_write` access to the options::
>>> c.read_write()

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.. default-role:: literal .. default-role:: literal
The options The options types
=============== ===================
Description of Options Description of Options
---------------------- ----------------------