Mercurial > piecrust2

annotate piecrust/configuration.py @ 84:b3ce11b2cf36

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author Ludovic Chabant <ludovic@chabant.com>
date Wed, 03 Sep 2014 17:26:38 -0700
parents d64e4703f5e6
children 10fc9c8bf682
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1 import re
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2 import logging
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3 import collections
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4 import yaml
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5 from yaml.constructor import ConstructorError
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6
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7
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8 logger = logging.getLogger(__name__)
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9
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10
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11 class ConfigurationError(Exception):
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12 pass
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14
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15 class Configuration(object):
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16 def __init__(self, values=None, validate=True):
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17 if values is not None:
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18 self.setAll(values, validate)
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19 else:
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20 self._values = None
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21
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22 def setAll(self, values, validate=True):
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23 if validate:
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24 self._validateAll(values)
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25 self._values = values
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26
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27 def getAll(self):
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28 return self.get()
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29
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30 def get(self, key_path=None):
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31 self._ensureLoaded()
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32 if key_path is None:
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33 return self._values
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34 bits = key_path.split('/')
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35 cur = self._values
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36 for b in bits:
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37 cur = cur.get(b)
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38 if cur is None:
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39 return None
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40 return cur
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41
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42 def set(self, key_path, value):
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43 self._ensureLoaded()
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44 value = self._validateValue(key_path, value)
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45 bits = key_path.split('/')
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46 bitslen = len(bits)
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47 cur = self._values
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48 for i, b in enumerate(bits):
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49 if i == bitslen - 1:
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50 cur[b] = value
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51 else:
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52 if b not in cur:
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53 cur[b] = {}
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54 cur = cur[b]
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55
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56 def has(self, key_path):
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57 self._ensureLoaded()
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58 bits = key_path.split('/')
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59 cur = self._values
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60 for b in bits:
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61 cur = cur.get(b)
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62 if cur is None:
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63 return False
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64 return True
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65
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66 def merge(self, other):
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67 self._ensureLoaded()
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68 merge_dicts(self._values, other._values,
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69 validator=self._validateValue)
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70
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71 def _ensureLoaded(self):
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72 if self._values is None:
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73 self._load()
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74
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75 def _load(self):
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76 self._values = self._validateAll({})
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77
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78 def _validateAll(self, values):
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79 return values
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80
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81 def _validateValue(self, key_path, value):
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82 return value
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83
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84
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85 def merge_dicts(source, merging, validator=None, *args):
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86 if validator is None:
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87 validator = lambda k, v: v
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88 _recurse_merge_dicts(source, merging, None, validator)
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89 for other in args:
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90 _recurse_merge_dicts(source, other, None, validator)
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91
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92
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93 def _recurse_merge_dicts(local_cur, incoming_cur, parent_path, validator):
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94 for k, v in incoming_cur.items():
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95 key_path = k
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96 if parent_path is not None:
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97 key_path = parent_path + '/' + k
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98
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99 local_v = local_cur.get(k)
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100 if local_v is not None:
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101 if isinstance(v, dict) and isinstance(local_v, dict):
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102 _recurse_merge_dicts(local_v, v, key_path, validator)
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103 elif isinstance(v, list) and isinstance(local_v, list):
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104 local_cur[k] = v + local_v
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105 else:
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106 local_cur[k] = validator(key_path, v)
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107 else:
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108 local_cur[k] = validator(key_path, v)
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109
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110
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111 header_regex = re.compile(
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112 r'(---\s*\n)(?P<header>(.*\n)*?)^(---\s*\n)', re.MULTILINE)
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113
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114
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115 def parse_config_header(text):
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116 m = header_regex.match(text)
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117 if m is not None:
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118 header = str(m.group('header'))
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119 config = yaml.load(header, Loader=OrderedDictYAMLLoader)
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120 offset = m.end()
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121 else:
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122 config = {}
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123 offset = 0
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124 return config, offset
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125
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126
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127 class OrderedDictYAMLLoader(yaml.SafeLoader):
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128 """ A YAML loader that loads mappings into ordered dictionaries.
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129 """
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130 def __init__(self, *args, **kwargs):
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131 super(OrderedDictYAMLLoader, self).__init__(*args, **kwargs)
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132
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133 self.add_constructor(u'tag:yaml.org,2002:map',
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134 type(self).construct_yaml_map)
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135 self.add_constructor(u'tag:yaml.org,2002:omap',
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136 type(self).construct_yaml_map)
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137
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138 def construct_yaml_map(self, node):
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139 data = collections.OrderedDict()
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140 yield data
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141 value = self.construct_mapping(node)
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142 data.update(value)
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143
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144 def construct_mapping(self, node, deep=False):
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
145 if not isinstance(node, yaml.MappingNode):
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
146 raise ConstructorError(None, None,
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
147 "expected a mapping node, but found %s" % node.id,
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
148 node.start_mark)
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
149 mapping = collections.OrderedDict()
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
150 for key_node, value_node in node.value:
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
151 key = self.construct_object(key_node, deep=deep)
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
152 if not isinstance(key, collections.Hashable):
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
153 raise ConstructorError("while constructing a mapping", node.start_mark,
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
154 "found unhashable key", key_node.start_mark)
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
155 value = self.construct_object(value_node, deep=deep)
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
156 mapping[key] = value
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
157 return mapping
563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
Ludovic Chabant <ludovic@chabant.com>
parents: 5
diff changeset
158