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make factory.py executable
author Jeff Hammel <jhammel@mozilla.com>
date Mon, 06 Jun 2011 09:55:14 -0700
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1 pyloader
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2 ===========
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4 Load python attributes from strings
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5
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6 JSON Format
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7 -----------
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8
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9 pyloader uses a JSON-serializable format for the canonical
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10 (serializable) form of python objects::
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12 {'foo': # (arbitrary) object name,
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13 {'args': ['positional', 'arguments'],
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14 'kwargs': {'keyword': 'arguments},
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15 'path': 'dotted.or.file.path:ObjectName'},
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16 'bar': ... } # etc
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17
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18 Objects are instantiated like::
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19
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20 ObjectName(*args, **kwargs)
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21
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22 In the case that the object is not to be instantiated (e.g. a
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23 standalone function, ``args`` and ``kwargs`` will either not be
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24 present or will be None (``null`` in JSON).
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26
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27 INI Format
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28 ----------
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30 pyloader also features an INI format which is translated to the JSON
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31 Format but adds a few convenience features. A simple object is
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32 expressed as::
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34 [foo:dotted.or.file.path:ObjectName]
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35 . = positional, arguments
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36 keyword = arguments
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37
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38 ``.`` expresses positional arguments which is a comma-separated
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39 list. The remaining (key, value) pairs become keyword arguments. The
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40 section name contains the object name (e.g. ``foo``) followed by a
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41 ``:`` followed by a loading path. Like JSON, a dotted path or a file
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42 path may be used. In addition, other (pluggable) loading paths are
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43 available:
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44
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45 - override loader: you can use a section name like ``[foo:bar]`` to
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46 override variables from the ``bar`` object with variables from
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47 ``foo``::
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48
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49 [foo:bar]
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50 . = cats, dogs
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51 type = count
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52
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53 [bar:%(here)s/some/path.py:MyObject]
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54 . = elephants
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55 type = concatenate
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56
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57 The above results in a JSON blob for foo like::
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58
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59 {'foo': {'args': ['elephants', 'cats', 'dogs'],
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60 'kwargs': {'type': 'concatenate'},
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61 'path': '/location/of/ini/file/some/path.py:MyObject'}}
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62
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63 ``args`` is extended. ``kwargs`` will be overridden.
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64
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65 - wrappers: in addition to the override pattern, you can also wrap an
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66 object::
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67
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68 [foo:bar:baz]
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70 In addition, .ini files may include other .ini files. This allows for
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71 encapsulation of intent of specific .ini files::
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72
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73 [include:%(here)s/some/file.ini]
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75 INI files have a few convenience variables:
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76
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77 - %(here)s : the location of the directory the .ini file lives in
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78 - %(app)s : used for wrappers
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79
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80 Additional variables may be provided by the consumer.
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82 ----
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84 Jeff Hammel
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85 http://k0s.org/
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86