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note formal syntax of section names
author Jeff Hammel <jhammel@mozilla.com>
date Sun, 12 Jun 2011 10:52:20 -0700
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1 pyloader
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2 ===========
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3
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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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11
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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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25
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26
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27 INI Format
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28 ----------
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29
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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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33
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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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69
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70 This will create an object, ``foo`` which wraps the object ``baz`` in
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71 by the pattern given by ``bar``. In this case, ``bar`` is provided
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72 a special variable, `%(app)s`.
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73
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74 You can also do::
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75
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76 [foo:bar:hi,hello,x=1,y=2:%(here)/objects.py:MyClass]
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77
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78
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79 In addition, .ini files may include other .ini files. This allows for
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80 encapsulation of intent of specific .ini files::
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81
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82 [include:%(here)s/some/file.ini]
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83
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84 INI files have a few convenience variables:
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85
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86 - %(here)s : the location of the directory the .ini file lives in
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87 - %(object)s : used for wrappers
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88
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89 Additional variables may be provided by the consumer.
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90
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91 Summary of .ini decorator syntax
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92 --------------------------------
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93
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94 1. ``[foo:%(here)s/objects.py:MyClass]``: create object ``foo`` of type
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95 ``MyClass`` using arguments given from the section
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96
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97 2. ``[foo:bar]``: create object ``foo`` using the pattern from section
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98 ``bar`` but overriding any arguments in the ``bar`` section with
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99 those from this section
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100
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101 3. ``[foo:bar:%(here)s/objects.py:MyClass]``: create object ``foo``
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102 which is an instance of ``MyClass`` wrapped in the object created by
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103 the ``bar`` pattern. ``bar`` is passed a special argument,
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104 ``%(object)s`` which is the instance of the wrapped object (the
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105 ``MyClass`` instance). Internally, the wrapped object is known by
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106 the whole section name (``foo:bar:%(here)s/objects.py:MyClass``). The
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107 arguments in this section apply to ``MyClass(...)``
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108
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109 4. ``[foo:bar:app=%(object)s,value=1:%(here)s/objects.py:MyClass]``:
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110 the same as 3. but override the values in the ``bar`` section with
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111 ``app=%(object)s`` and ``value=1``
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112
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113 Section Name Syntax
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114 -------------------
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115
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116 - *[name:resource]* : create an object named *name* , where resource
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117 is either a section name or a *path* as described in `JSON Format`_ .
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118 In the case where *resouce* is another section name, the options
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119 will overide the options given in the *resource* section and a new
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120 object named *name* will be created. In the case where *section* is
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121 a path, an object will be created as given by the *path* with the
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122 given options.
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123 - *[name:decorator:resource]* : create an object named *name* where
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124 the object given by *resource* is passed to *decorator*. Overrides
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125 and loading is as described for *[name:reource]* . An anonymous
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126 object is created of the whole section name for the wrapped
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127 object. So this form results in two sections for the `JSON Format`_ .
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128 *decorator* is a section in the same namespace as *name*.
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129 - *[name:decorator:overrides:resource]* : similar to
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130 *[name:decorator:resource]* , but apply *overides* to the
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131 *decorator* section. *overrides* is a string of the format
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132 ``foo,bar,fleem=5``.
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133
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134 ----
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135
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136 Jeff Hammel
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137 http://k0s.org/
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138