Mercurial > piecrust2

annotate piecrust/configuration.py @ 680:c2ea75e37540

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serve: Fix some crashes introduced by recent refactor.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 08 Mar 2016 01:05:39 -0800
parents 81d9c3a3a0b5
children ec384174b8b2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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a212a3f2e3ee Initial commit.
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diff changeset
1 import re
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2 import logging
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3 import collections
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4 import collections.abc
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5 import yaml
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563ce5dd02af I don't care what the YAML spec says, ordered maps are the only sane way.
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6 from yaml.constructor import ConstructorError
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7 try:
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8 from yaml import CSafeLoader as SafeLoader
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9 except ImportError:
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10 from yaml import SafeLoader
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12
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13 logger = logging.getLogger(__name__)
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14
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15 default_allowed_types = (dict, list, tuple, float, int, bool, str)
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16
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17
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f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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18 class ConfigurationError(Exception):
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19 pass
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20
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21
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22 class Configuration(collections.abc.MutableMapping):
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23 def __init__(self, values=None, validate=True):
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24 if values is not None:
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25 self.setAll(values, validate=validate)
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26 else:
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27 self._values = None
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28
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29 def __getitem__(self, key):
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30 self._ensureLoaded()
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31 try:
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32 return get_dict_value(self._values, key)
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33 except KeyError:
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34 raise KeyError("No such item: %s" % key)
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35
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36 def __setitem__(self, key, value):
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37 self._ensureLoaded()
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38 value = self._validateValue(key, value)
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39 set_dict_value(self._values, key, value)
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40
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41 def __delitem__(self, key):
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42 raise NotImplementedError()
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43
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44 def __iter__(self):
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45 self._ensureLoaded()
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46 return iter(self._values)
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47
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48 def __len__(self):
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49 self._ensureLoaded()
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50 return len(self._values)
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51
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52 def has(self, key):
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53 return key in self
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54
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55 def set(self, key, value):
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56 self[key] = value
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57
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58 def setAll(self, values, validate=False):
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59 if validate:
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60 values = self._validateAll(values)
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61 self._values = values
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62
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63 def getAll(self):
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64 self._ensureLoaded()
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65 return self._values
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66
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67 def merge(self, other):
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68 self._ensureLoaded()
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69
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70 if isinstance(other, dict):
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71 other_values = other
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72 elif isinstance(other, Configuration):
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73 other_values = other._values
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74 else:
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75 raise Exception(
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76 "Unsupported value type to merge: %s" % type(other))
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77
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78 merge_dicts(self._values, other_values,
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79 validator=self._validateValue)
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80
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81 def validateTypes(self, allowed_types=default_allowed_types):
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82 self._validateDictTypesRecursive(self._values, allowed_types)
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83
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84 def _validateDictTypesRecursive(self, d, allowed_types):
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85 for k, v in d.items():
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86 if not isinstance(k, str):
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87 raise ConfigurationError("Key '%s' is not a string." % k)
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88 self._validateTypeRecursive(v, allowed_types)
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89
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90 def _validateListTypesRecursive(self, l, allowed_types):
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91 for v in l:
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92 self._validateTypeRecursive(v, allowed_types)
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93
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94 def _validateTypeRecursive(self, v, allowed_types):
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95 if v is None:
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96 return
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97 if not isinstance(v, allowed_types):
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98 raise ConfigurationError(
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99 "Value '%s' is of forbidden type: %s" % (v, type(v)))
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100 if isinstance(v, dict):
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101 self._validateDictTypesRecursive(v, allowed_types)
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102 elif isinstance(v, list):
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103 self._validateListTypesRecursive(v, allowed_types)
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104
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105 def _ensureLoaded(self):
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106 if self._values is None:
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107 self._load()
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108
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109 def _load(self):
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110 self._values = self._validateAll({})
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111
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112 def _validateAll(self, values):
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113 return values
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114
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115 def _validateValue(self, key_path, value):
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116 return value
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117
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118
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119 def get_dict_value(d, key):
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120 bits = key.split('/')
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121 cur = d
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122 for b in bits:
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123 cur = cur[b]
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124 return cur
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125
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126
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127 def set_dict_value(d, key, value):
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128 bits = key.split('/')
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129 bitslen = len(bits)
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130 cur = d
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131 for i, b in enumerate(bits):
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132 if i == bitslen - 1:
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133 cur[b] = value
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134 else:
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135 if b not in cur:
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136 cur[b] = {}
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137 cur = cur[b]
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138
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139
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140 def merge_dicts(source, merging, validator=None, *args):
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141 _recurse_merge_dicts(source, merging, None, validator)
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142 for other in args:
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143 _recurse_merge_dicts(source, other, None, validator)
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144 return source
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145
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146
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147 def _recurse_merge_dicts(local_cur, incoming_cur, parent_path, validator):
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148 for k, v in incoming_cur.items():
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149 key_path = k
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150 if parent_path is not None:
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151 key_path = parent_path + '/' + k
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152
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153 local_v = local_cur.get(k)
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154 if local_v is not None:
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155 if isinstance(v, dict) and isinstance(local_v, dict):
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156 _recurse_merge_dicts(local_v, v, key_path, validator)
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157 elif isinstance(v, list) and isinstance(local_v, list):
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158 local_cur[k] = v + local_v
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159 else:
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160 if validator is not None:
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161 v = validator(key_path, v)
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162 local_cur[k] = v
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163 else:
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164 if validator is not None:
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165 v = validator(key_path, v)
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166 local_cur[k] = v
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167
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168
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169 def visit_dict(subject, visitor):
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170 _recurse_visit_dict(subject, None, visitor)
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171
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172
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173 def _recurse_visit_dict(cur, parent_path, visitor):
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174 for k, v in cur.items():
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175 key_path = k
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176 if parent_path is not None:
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177 key_path = parent_path + '/' + k
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178
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179 visitor(key_path, v, cur, k)
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180 if isinstance(v, dict):
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181 _recurse_visit_dict(v, key_path, visitor)
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182
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183
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184 header_regex = re.compile(
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185 r'(---\s*\n)(?P<header>(.*\n)*?)^(---\s*\n)', re.MULTILINE)
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186
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187
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188 def parse_config_header(text):
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189 m = header_regex.match(text)
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190 if m is not None:
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191 header = str(m.group('header'))
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192 config = yaml.load(header, Loader=ConfigurationLoader)
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193 offset = m.end()
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194 else:
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195 config = {}
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196 offset = 0
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197 return config, offset
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198
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199
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200 class ConfigurationLoader(SafeLoader):
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201 """ A YAML loader that loads mappings into ordered dictionaries.
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202 """
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203 def __init__(self, *args, **kwargs):
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204 super(ConfigurationLoader, self).__init__(*args, **kwargs)
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205
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206 self.add_constructor('tag:yaml.org,2002:map',
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207 type(self).construct_yaml_map)
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208 self.add_constructor('tag:yaml.org,2002:omap',
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209 type(self).construct_yaml_map)
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210 self.add_constructor('tag:yaml.org,2002:sexagesimal',
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211 type(self).construct_yaml_time)
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212
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213 def construct_yaml_map(self, node):
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214 data = collections.OrderedDict()
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215 yield data
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216 value = self.construct_mapping(node)
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217 data.update(value)
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218
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219 def construct_mapping(self, node, deep=False):
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220 if not isinstance(node, yaml.MappingNode):
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221 raise ConstructorError(None, None,
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222 "expected a mapping node, but found %s" % node.id,
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223 node.start_mark)
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224 mapping = collections.OrderedDict()
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225 for key_node, value_node in node.value:
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226 key = self.construct_object(key_node, deep=deep)
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227 if not isinstance(key, collections.Hashable):
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228 raise ConstructorError("while constructing a mapping", node.start_mark,
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229 "found unhashable key", key_node.start_mark)
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230 value = self.construct_object(value_node, deep=deep)
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231 mapping[key] = value
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232 return mapping
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diff changeset
233
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234 time_regexp = re.compile(
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235 r'''^(?P<hour>[0-9][0-9]?)
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diff changeset
236 :(?P<minute>[0-9][0-9])
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237 (:(?P<second>[0-9][0-9])
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238 (\.(?P<fraction>[0-9]+))?)?$''', re.X)
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diff changeset
239
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240 def construct_yaml_time(self, node):
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241 self.construct_scalar(node)
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242 match = self.time_regexp.match(node.value)
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243 values = match.groupdict()
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244 hour = int(values['hour'])
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245 minute = int(values['minute'])
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246 second = 0
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247 if values['second']:
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248 second = int(values['second'])
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249 usec = 0
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250 if values['fraction']:
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251 usec = float('0.' + values['fraction'])
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252 return second + minute * 60 + hour * 60 * 60 + usec
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253
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254
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255 ConfigurationLoader.add_implicit_resolver(
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256 'tag:yaml.org,2002:sexagesimal',
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257 re.compile(r'''^[0-9][0-9]?:[0-9][0-9]
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258 (:[0-9][0-9](\.[0-9]+)?)?$''', re.X),
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diff changeset
259 list('0123456789'))
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260
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261
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262 # We need to add our `sexagesimal` resolver before the `int` one, which
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263 # already supports sexagesimal notation in YAML 1.1 (but not 1.2). However,
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264 # because we know we pretty much always want it for representing time, we
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265 # need a simple `12:30` to mean 45000, not 750. So that's why we override
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266 # the default behaviour.
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267 for ch in list('0123456789'):
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268 ch_resolvers = ConfigurationLoader.yaml_implicit_resolvers[ch]
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269 ch_resolvers.insert(0, ch_resolvers.pop())
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270
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271
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272 class ConfigurationDumper(yaml.SafeDumper):
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273 def represent_ordered_dict(self, data):
301
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274 # Not a typo: we're using `map` and not `omap` because we don't want
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275 # ugly type tags printed in the generated YAML markup, and because
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276 # we always load maps into `OrderedDicts` anyway.
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277 return self.represent_mapping('tag:yaml.org,2002:map', data)
107
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278
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279
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280 ConfigurationDumper.add_representer(collections.OrderedDict,
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281 ConfigurationDumper.represent_ordered_dict)
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282