Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/yaml.py @ 31:50721b43e76c v0.2

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+++++ v0.2
author Franz Glasner <hg@dom66.de>
date Fri, 18 Mar 2016 09:28:34 +0100
parents ce290b10dac5
children aa8345dae995
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1
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1 # -*- coding: utf-8 -*-
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2 r"""Simple wrapper for yaml to support all-unicode strings when loading
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3 configuration files.
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4
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5 """
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6
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7 from __future__ import division, print_function, absolute_import
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8
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9 try:
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10 from collections import OrderedDict
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11 except ImportError:
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12 try:
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13 from ordereddict import OrderedDict
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14 except ImportError:
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15 OrderedDict = None
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16 import yaml
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17 import yaml.constructor
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18
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19 from .compat import u
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22 __all__ = ["safe_load", "safe_load_all", "load", "load_all"]
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23
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25 class ConfigLoader(yaml.Loader):
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26
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27 """A YAML loader, which makes all !!str strings to Unicode. Standard
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28 PyYAML does this only in the non-ASCII case.
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29
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30 If an `OrderedDict` implementation is available then all "map" and
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31 "omap" nodes are constructed as `OrderedDict`.
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32 This is against YAML specs but within configuration files it seems
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33 more natural.
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35 """
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36
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37 def construct_yaml_str(self, node):
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38 return self.construct_scalar(node)
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39
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40 if OrderedDict:
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41
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42 #
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43 # From https://pypi.python.org/pypi/yamlordereddictloader/0.1.1
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44 # (MIT License)
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45 #
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46
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47 def construct_yaml_map(self, node):
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48 data = OrderedDict()
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49 yield data
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50 value = self.construct_mapping(node)
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51 data.update(value)
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52
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53 def construct_mapping(self, node, deep=False):
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54 if isinstance(node, yaml.MappingNode):
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55 self.flatten_mapping(node)
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56 else:
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57 raise yaml.constructor.ConstructorError(None, None,
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58 'expected a mapping node, but found %s' % node.id,
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59 node.start_mark)
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60
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61 mapping = OrderedDict()
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62 for key_node, value_node in node.value:
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63 key = self.construct_object(key_node, deep=deep)
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64 try:
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65 hash(key)
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66 except TypeError as err:
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67 raise yaml.constructor.ConstructorError(
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68 'while constructing a mapping', node.start_mark,
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69 'found unacceptable key (%s)' % err, key_node.start_mark)
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70 value = self.construct_object(value_node, deep=deep)
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71 mapping[key] = value
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72 return mapping
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73
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74
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75 ConfigLoader.add_constructor(
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76 u("tag:yaml.org,2002:str"),
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77 ConfigLoader.construct_yaml_str)
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78 if OrderedDict:
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79 ConfigLoader.add_constructor(
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80 u("tag:yaml.org,2002:map"),
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81 ConfigLoader.construct_yaml_map)
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82 ConfigLoader.add_constructor(
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83 u("tag:yaml.org,2002:omap"),
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84 ConfigLoader.construct_yaml_map)
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85
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86
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87 class ConfigSafeLoader(yaml.SafeLoader):
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88
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89 """A safe YAML loader, which makes all !!str strings to Unicode.
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90 Standard PyYAML does this only in the non-ASCII case.
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91
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92 If an `OrderedDict` implementation is available then all "map" and
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93 "omap" nodes are constructed as `OrderedDict`.
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94 This is against YAML specs but within configuration files it seems
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95 more natural.
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96
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97 """
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98
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99 def construct_yaml_str(self, node):
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100 return self.construct_scalar(node)
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101
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102 if OrderedDict:
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103
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104 #
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105 # From https://pypi.python.org/pypi/yamlordereddictloader/0.1.1
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106 # (MIT License)
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107 #
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108
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109 def construct_yaml_map(self, node):
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110 data = OrderedDict()
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111 yield data
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112 value = self.construct_mapping(node)
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113 data.update(value)
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114
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115 def construct_mapping(self, node, deep=False):
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116 if isinstance(node, yaml.MappingNode):
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117 self.flatten_mapping(node)
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118 else:
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119 raise yaml.constructor.ConstructorError(None, None,
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120 'expected a mapping node, but found %s' % node.id,
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121 node.start_mark)
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122
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123 mapping = OrderedDict()
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124 for key_node, value_node in node.value:
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125 key = self.construct_object(key_node, deep=deep)
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126 try:
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127 hash(key)
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128 except TypeError as err:
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129 raise yaml.constructor.ConstructorError(
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130 'while constructing a mapping', node.start_mark,
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131 'found unacceptable key (%s)' % err, key_node.start_mark)
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132 value = self.construct_object(value_node, deep=deep)
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133 mapping[key] = value
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134 return mapping
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135
1
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136
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137 ConfigSafeLoader.add_constructor(
21
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138 u("tag:yaml.org,2002:str"),
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139 ConfigSafeLoader.construct_yaml_str)
3
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140 if OrderedDict:
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141 ConfigSafeLoader.add_constructor(
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142 u("tag:yaml.org,2002:map"),
3
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143 ConfigSafeLoader.construct_yaml_map)
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144 ConfigSafeLoader.add_constructor(
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145 u("tag:yaml.org,2002:omap"),
3
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146 ConfigSafeLoader.construct_yaml_map)
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147
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148
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149 def load(stream, Loader=ConfigLoader):
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150 return yaml.load(stream, Loader)
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151
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152
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153 def load_all(stream, Loader=ConfigLoader):
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154 return yaml.load_all(stream, Loader)
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155
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156
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157 def safe_load(stream):
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158 return yaml.load(stream, Loader=ConfigSafeLoader)
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159
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160
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161 def safe_load_all(stream):
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162 return yaml.load_all(stream, Loader=ConfigSafeLoader)