Mercurial > hg > pyloader

annotate pyloader/factory.py @ 74:1f76705df520

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interpolate inline wrapper options
author Jeff Hammel <jhammel@mozilla.com>
date Thu, 09 Jun 2011 18:21:18 -0700
parents 65c95094dbb3
children 20bdb8125817
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1 #!/usr/bin/env python
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2
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3 """
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4 abstract factories
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5 """
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6
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7 import cast
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8 import loader
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9 import os
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10 import sys
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11 from copy import deepcopy
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12 from optparse import OptionParser
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13 from ConfigParser import InterpolationDepthError
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14 from ConfigParser import InterpolationMissingOptionError
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15 from ConfigParser import InterpolationSyntaxError
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16 from ConfigParser import SafeConfigParser as ConfigParser
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17
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18 __all__ = ['CircularReferenceError', 'PyFactory', 'IniFactory']
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20 class CircularReferenceError(Exception):
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21 """factory has detected a circular reference"""
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22
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23 class PyFactory(object):
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24
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25 delimeters = ('%(', ')s')
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26
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27 def __init__(self, config=None, main=''):
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28 self.main = main # main section
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29 self.configure(config or {})
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30
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31 def configure(self, config):
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32 """load a new configuration"""
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33 # TODO: this should really be a configuration update. If you keep
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34 # track of all "apps" and their parents (i.e. as a ADG)
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35 # you should be able to update only relevent apps
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36 self.config = config
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37 self.seen = set() # already seen apps to note cyclic dependencies
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38 self.parsed = {} # instantiated apps
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39
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40 def load(self, name=None):
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41 """load an object"""
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42
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43 name = name or self.main # load main section by default
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44 assert name in self.config, "'%s' not found in configuration"
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45 if name in self.parsed:
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46 return self.parsed[name]
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47 if name in self.seen:
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48 raise CircularReferenceError('Circular reference! : %s' % name)
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49 self.seen.add(name)
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50
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51 # get section
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52 section = self.config[name]
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53 assert 'path' in section
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54
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55 # load object
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56 obj = loader.load(section['path'])
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57
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58 # get the object's arguments (if any)
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59 args = section.get('args', None)
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60 kwargs = section.get('kwargs', None)
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61
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62 # if args and kwargs aren't there, you're done!
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63 if args is None and kwargs is None:
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64 self.parsed[name] = obj
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65 return obj
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66
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67 # interpolate arguments
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68 if args:
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69 args = [self.interpolate(arg) for arg in args]
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70 else:
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71 args = []
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72 if kwargs:
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73 kwargs = dict([(key, self.interpolate(value))
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74 for key, value in kwargs.items()])
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75 else:
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76 kwargs = {}
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77
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78 # invoke
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79 self.parsed[name] = obj(*args, **kwargs)
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80 return self.parsed[name]
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81
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82 def interpolate(self, value):
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83
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84 # only interpolate strings
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85 if not isinstance(value, basestring):
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86 return value
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87
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88 if value.startswith(self.delimeters[0]) and value.endswith(self.delimeters[1]):
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89 value = value[len(self.delimeters[0]):-len(self.delimeters[1])]
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90 if value in self.config:
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91 return self.load(value)
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92 return value
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93
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94 class IniFactory(PyFactory):
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95 """load a python object from an .ini file"""
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96
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97 def __init__(self, inifile, main=''):
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98 assert os.path.exists(inifile), "File not found: %s" % inifile
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99 self.inifile = inifile
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100 config = self.read(inifile)
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101 PyFactory.__init__(self, config, main)
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102
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103 @classmethod
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104 def configuration(cls, iniconfig, **defaults):
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105 """interpret configuration from raw .ini syntax"""
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106 config = {}
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107 interpolated = set()
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108 seen = set()
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109 object_string = '%(object)s'
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110
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111 # create a hash of section names
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112 names = {}
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113 for section in iniconfig:
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114
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115 # sanity check
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116 assert ':' in section, "No : in section: %s" % section
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117
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118 name = section.split(':',1)[0]
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119 names[name] = section
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120
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121 def create_section(section, options):
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122
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123 # split up the section identifier
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124 name, path = section.split(':', 1)
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125
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126 # make a dict for the section
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127 sect = {}
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128
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129 # interpret decorators
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130 if ':' in path:
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131 wrapper, _path = path.split(':', 1)
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132 # TODO: could interpolate wrapper
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133 if wrapper in names:
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134
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135 # inline wrapper arguments:
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136 # [extended-fibonacci:@:four=4,five=5:fibonacci]
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137 _wrapper_args = None
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138 _wrapper_kwargs = None
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139 if ':' in _path:
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140 _wrapper_options, __path = path.split(':', 1)
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141 if ',' in _wrapper_options or '=' in _wrapper_options:
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142 # ,= : tokens to ensure these are wrapper options
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143 # as these shouldn't be found in a real path (dotted path or file path)
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144 _wrapper_args, _wrapper_kwargs = factory.str2args(_wrapper_options)
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145 _path = __path
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146
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147 if _path in names:
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148 # [foo:bar:fleem]
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149 wrapped_name = _path
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150 else:
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151 # stub value for "anonymous" name
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152 # [foo:bar:%(here)s/objects.py:MyClass]
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153 wrapped_name = section
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154
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155 # get wrapper options
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156 if wrapper not in config:
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157 # load wrapper configuration
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158 wrapper_section = names[wrapper]
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159 if wrapper_section in seen:
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160 pass # TODO
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161 create_section(wrapper_section, iniconfig[wrapper_section])
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162 wrapper_options = deepcopy(config[wrapper])
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163
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164 # add inline wrapper args, kwargs
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165 if _wrapper_args is not None:
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166 if 'args' in wrapper_options:
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167 wrapper_options['args'].extend(_wrapper_args)
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168 else:
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169 wrapper_options['args'] = _wrapper_args
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170 if _wrapper_kwargs is not None:
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171 if 'kwargs' in wrapper_options:
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172 wrapper_options['kwargs'].update(_wrapper_kwargs)
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173 else:
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174 wrapper_options['kwargs'] = _wrapper_kwargs
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175
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176 # interpolate wrapper_options
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177 def interpolate(option):
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178 if option == object_string:
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179 return '%(' + wrapped_name + ')s'
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180 return option
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181 if 'args' in wrapper_options:
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182 args = wrapper_options['args'][:]
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183 args = [interpolate(i) for i in args]
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184 wrapper_options['args'] = args
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185 if 'kwargs' in wrapper_options:
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186 kwargs = wrapper_options['kwargs'].copy()
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187 kwargs = dict([(i,interpolate(j)) for i, j in kwargs.items()])
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188 wrapper_options['kwargs'] = kwargs
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189
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190 # create wrapper
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191 config[name] = wrapper_options
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192 if _path == wrapped_name:
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193 return
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194 name = wrapped_name
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195 path = _path
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196
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197 elif path in names:
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198 # override section: [foo:bar]
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199 if path not in config:
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200 # load overridden section
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201 overridden_section = names[path]
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202 if overridden_section in seen:
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203 pass # TODO
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204 create_section(overridden_section, iniconfig[overridden_section])
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205 sect = deepcopy(config[path])
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206
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207 if 'path' not in sect:
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208 # add the path to section dict
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209 path = path % defaults
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210 sect['path'] = path
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211
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212 # get arguments from .ini options
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213 for option, value in options.items():
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214 if option == '.': # positional arguments
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215 sect['args'] = cast.str2list(value)
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216 else: # keyword arguments
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217 sect.setdefault('kwargs', {})[option] = value
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218
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219 # set the configuration
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220 config[name] = sect
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221
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222 # get the object definitions
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223 for section, options in iniconfig.items():
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224 seen.add(section)
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225 if section not in interpolated:
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226 create_section(section, options)
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227 interpolated.add(section)
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228
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229 return config
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230
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231 @classmethod
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232 def read(cls, inifile):
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233 """reads configuration from an .ini file"""
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234
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235 here = os.path.dirname(os.path.abspath(inifile))
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236
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237 # read configuration
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238 defaults={'here': here,
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239 'this': os.path.abspath(inifile)}
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240 parser = ConfigParser(defaults=defaults)
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241 parser.optionxform = str # use whole case
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242 parser.read(inifile)
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243
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244 # parse configuration
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245 config = {}
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246 for section in parser.sections():
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247
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248 config[section] = {}
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249
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250 # read the options
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251 for option in parser.options(section):
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252
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253 if option in parser.defaults():
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254 # don't include the defaults
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255 continue
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256
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257 # try to interpolate the option
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258 # otherwise, use the raw value
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259 try:
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diff changeset
260 value = parser.get(section, option)
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261 except (InterpolationMissingOptionError, InterpolationSyntaxError, InterpolationDepthError):
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262 value = parser.get(section, option, raw=True)
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263
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264 config[section][option] = value
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265
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266 return cls.configuration(config, **parser.defaults())
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267
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268 def main(args=sys.argv[1:]):
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269 """command line entry point"""
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270 usage = '%prog file1.ini -arg1 -arg2 --key1=value1 --key2=value2'
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271 parser = OptionParser(usage=usage, description=IniFactory.__doc__)
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272 options, args = parser.parse_args(args)
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273
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274 if len(args) != 1:
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275 parser.print_usage()
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276 parser.exit()
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277
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diff changeset
278 factory = IniFactory(args[0])
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279 obj = factory.load()
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280 print obj
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281
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282 if __name__ == '__main__':
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283 main()