Mercurial > pymonkey

annotate python-modules/paver/options.py @ 25:3c2151124cee

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Converted pavement.py to manage.py and added a README.
author Atul Varma <varmaa@toolness.com>
date Mon, 29 Jun 2009 10:19:33 -0700
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3c2151124cee Converted pavement.py to manage.py and added a README.
Atul Varma <varmaa@toolness.com>
parents:
diff changeset
1 class OptionsError(Exception):
3c2151124cee Converted pavement.py to manage.py and added a README.
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2 pass
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3
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4 class Bunch(dict):
3c2151124cee Converted pavement.py to manage.py and added a README.
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5 """A dictionary that provides attribute-style access."""
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6
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7 def __repr__(self):
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8 keys = self.keys()
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9 keys.sort()
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10 args = ', '.join(['%s=%r' % (key, self[key]) for key in keys])
3c2151124cee Converted pavement.py to manage.py and added a README.
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11 return '%s(%s)' % (self.__class__.__name__, args)
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12
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13 def __getitem__(self, key):
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14 item = dict.__getitem__(self, key)
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15 if callable(item):
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16 return item()
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17 return item
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18
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19 def __getattr__(self, name):
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20 try:
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21 return self[name]
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22 except KeyError:
3c2151124cee Converted pavement.py to manage.py and added a README.
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23 raise AttributeError(name)
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24
3c2151124cee Converted pavement.py to manage.py and added a README.
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25 __setattr__ = dict.__setitem__
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26
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27 def __delattr__(self, name):
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28 try:
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29 del self[name]
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30 except KeyError:
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31 raise AttributeError(name)
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32
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33 class Namespace(Bunch):
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34 """A Bunch that will search dictionaries contained within to find a value.
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35 The search order is set via the order() method. See the order method for
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36 more information about search order.
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37 """
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38 def __init__(self, d=None, **kw):
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39 self._sections = []
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40 self._ordering = None
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41 self.update(d, **kw)
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42
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43 def order(self, *keys, **kw):
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44 """Set the search order for this namespace. The arguments
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45 should be the list of keys in the order you wish to search,
3c2151124cee Converted pavement.py to manage.py and added a README.
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46 or a dictionary/Bunch that you want to search.
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47 Keys that are left out will not be searched. If you pass in
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48 no arguments, then the default ordering will be used. (The default
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49 is to search the global space first, then in the order in
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50 which the sections were created.)
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51
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52 If you pass in a key name that is not a section, that
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53 key will be silently removed from the list.
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54
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55 Keyword arguments are:
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56
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57 add_rest=False
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58 put the sections you list at the front of the search
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59 and add the remaining sections to the end
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60 """
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61 if not keys:
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62 self._ordering = None
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63 return
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64
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65 order = []
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66 for item in keys:
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67 if isinstance(item, dict) or item in self._sections:
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68 order.append(item)
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69
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70 if kw.get('add_rest'):
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71 # this is not efficient. do we care? probably not.
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72 for item in self._sections:
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73 if item not in order:
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74 order.append(item)
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75 self._ordering = order
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76
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77 def clear(self):
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78 self._ordering = None
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79 self._sections = []
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80 super(Namespace, self).clear()
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81
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82 def setdotted(self, key, value):
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83 """Sets a namespace key, value pair where the key
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84 can use dotted notation to set sub-values. For example,
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85 the key "foo.bar" will set the "bar" value in the "foo"
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86 Bunch in this Namespace. If foo does not exist, it is created
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87 as a Bunch. If foo is a value, an OptionsError will be
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88 raised."""
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89 segments = key.split(".")
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90 obj = self
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91 segment = segments.pop(0)
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92 while segments:
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93 if segment not in obj:
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94 obj[segment] = Bunch()
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95 obj = obj[segment]
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96 if not isinstance(obj, dict):
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97 raise OptionsError("In setting option '%s', %s was already a value"
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98 % (key, segment))
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99 segment = segments.pop(0)
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100 obj[segment] = value
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101
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102 def __setitem__(self, key, value):
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103 if isinstance(value, dict):
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104 self._sections.insert(0, key)
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105 super(Namespace, self).__setitem__(key, value)
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106
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107 def get(self, key, default=None):
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108 try:
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109 return self[key]
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110 except KeyError:
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111 return default
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112
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113 def __getitem__(self, key):
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114 order = self._ordering
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115 if order is None:
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116 order = self._sections
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117 try:
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118 return super(Namespace, self).__getitem__(key)
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119 except KeyError:
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120 pass
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121 for section in order:
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122 if isinstance(section, dict):
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123 try:
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124 return section[key]
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125 except KeyError:
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126 pass
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127 else:
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128 try:
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129 return self[section][key]
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130 except KeyError:
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131 pass
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132 raise KeyError("Key %s not found in namespace" % key)
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133
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134 def __setattr__(self, key, value):
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135 if key.startswith("_"):
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136 object.__setattr__(self, key, value)
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137 else:
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138 self[key] = value
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139
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140 def __delitem__(self, key):
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141 try:
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142 index = self._sections.index(key)
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143 del self._sections[index]
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144 except ValueError:
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145 pass
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146 super(Namespace, self).__delitem__(key)
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147
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148 def update(self, d=None, **kw):
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149 """Update the namespace. This is less efficient than the standard
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150 dict.update but is necessary to keep track of the sections that we'll be
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151 searching."""
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152 items = []
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153 if d:
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154 # look up keys even though we call items
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155 # because that's what the dict.update
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156 # doc says
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157 if hasattr(d, 'keys'):
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158 items.extend(list(d.items()))
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159 else:
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160 items.extend(list(d))
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161 items.extend(list(kw.items()))
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162 for key, value in items:
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163 self[key] = value
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164
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165 __call__ = update
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166
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167 def setdefault(self, key, default):
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168 if not key in self:
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169 self[key] = default
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170 return default
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171 return self[key]