Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/yaml/representer.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1
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2 __all__ = ['BaseRepresenter', 'SafeRepresenter', 'Representer',
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3 'RepresenterError']
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4
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5 from error import *
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6 from nodes import *
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7
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8 import datetime
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9
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10 import sys, copy_reg, types
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11
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12 class RepresenterError(YAMLError):
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13 pass
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14
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15 class BaseRepresenter(object):
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16
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17 yaml_representers = {}
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18 yaml_multi_representers = {}
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19
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20 def __init__(self, default_style=None, default_flow_style=None):
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21 self.default_style = default_style
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22 self.default_flow_style = default_flow_style
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23 self.represented_objects = {}
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24 self.object_keeper = []
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25 self.alias_key = None
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26
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27 def represent(self, data):
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28 node = self.represent_data(data)
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29 self.serialize(node)
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30 self.represented_objects = {}
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31 self.object_keeper = []
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32 self.alias_key = None
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33
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34 def get_classobj_bases(self, cls):
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35 bases = [cls]
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36 for base in cls.__bases__:
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37 bases.extend(self.get_classobj_bases(base))
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38 return bases
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39
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40 def represent_data(self, data):
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41 if self.ignore_aliases(data):
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42 self.alias_key = None
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43 else:
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44 self.alias_key = id(data)
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45 if self.alias_key is not None:
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46 if self.alias_key in self.represented_objects:
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47 node = self.represented_objects[self.alias_key]
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48 #if node is None:
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49 # raise RepresenterError("recursive objects are not allowed: %r" % data)
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50 return node
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51 #self.represented_objects[alias_key] = None
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52 self.object_keeper.append(data)
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53 data_types = type(data).__mro__
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54 if type(data) is types.InstanceType:
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55 data_types = self.get_classobj_bases(data.__class__)+list(data_types)
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56 if data_types[0] in self.yaml_representers:
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57 node = self.yaml_representers[data_types[0]](self, data)
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58 else:
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59 for data_type in data_types:
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60 if data_type in self.yaml_multi_representers:
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61 node = self.yaml_multi_representers[data_type](self, data)
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62 break
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63 else:
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64 if None in self.yaml_multi_representers:
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65 node = self.yaml_multi_representers[None](self, data)
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66 elif None in self.yaml_representers:
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67 node = self.yaml_representers[None](self, data)
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68 else:
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69 node = ScalarNode(None, unicode(data))
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70 #if alias_key is not None:
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71 # self.represented_objects[alias_key] = node
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72 return node
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73
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74 def add_representer(cls, data_type, representer):
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75 if not 'yaml_representers' in cls.__dict__:
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76 cls.yaml_representers = cls.yaml_representers.copy()
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77 cls.yaml_representers[data_type] = representer
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78 add_representer = classmethod(add_representer)
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79
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80 def add_multi_representer(cls, data_type, representer):
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81 if not 'yaml_multi_representers' in cls.__dict__:
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82 cls.yaml_multi_representers = cls.yaml_multi_representers.copy()
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83 cls.yaml_multi_representers[data_type] = representer
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84 add_multi_representer = classmethod(add_multi_representer)
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85
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86 def represent_scalar(self, tag, value, style=None):
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87 if style is None:
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88 style = self.default_style
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89 node = ScalarNode(tag, value, style=style)
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90 if self.alias_key is not None:
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91 self.represented_objects[self.alias_key] = node
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92 return node
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93
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94 def represent_sequence(self, tag, sequence, flow_style=None):
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95 value = []
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96 node = SequenceNode(tag, value, flow_style=flow_style)
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97 if self.alias_key is not None:
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98 self.represented_objects[self.alias_key] = node
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99 best_style = True
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100 for item in sequence:
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101 node_item = self.represent_data(item)
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102 if not (isinstance(node_item, ScalarNode) and not node_item.style):
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103 best_style = False
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104 value.append(node_item)
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105 if flow_style is None:
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106 if self.default_flow_style is not None:
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107 node.flow_style = self.default_flow_style
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108 else:
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109 node.flow_style = best_style
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110 return node
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111
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112 def represent_mapping(self, tag, mapping, flow_style=None):
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113 value = []
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114 node = MappingNode(tag, value, flow_style=flow_style)
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115 if self.alias_key is not None:
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116 self.represented_objects[self.alias_key] = node
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117 best_style = True
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118 if hasattr(mapping, 'items'):
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119 mapping = mapping.items()
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120 mapping.sort()
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121 for item_key, item_value in mapping:
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122 node_key = self.represent_data(item_key)
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123 node_value = self.represent_data(item_value)
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124 if not (isinstance(node_key, ScalarNode) and not node_key.style):
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125 best_style = False
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126 if not (isinstance(node_value, ScalarNode) and not node_value.style):
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127 best_style = False
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128 value.append((node_key, node_value))
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129 if flow_style is None:
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130 if self.default_flow_style is not None:
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131 node.flow_style = self.default_flow_style
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132 else:
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133 node.flow_style = best_style
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134 return node
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135
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136 def ignore_aliases(self, data):
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137 return False
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138
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139 class SafeRepresenter(BaseRepresenter):
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140
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141 def ignore_aliases(self, data):
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142 if data in [None, ()]:
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143 return True
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144 if isinstance(data, (str, unicode, bool, int, float)):
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145 return True
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146
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147 def represent_none(self, data):
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148 return self.represent_scalar(u'tag:yaml.org,2002:null',
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149 u'null')
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150
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151 def represent_str(self, data):
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152 tag = None
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153 style = None
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154 try:
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155 data = unicode(data, 'ascii')
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156 tag = u'tag:yaml.org,2002:str'
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157 except UnicodeDecodeError:
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158 try:
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159 data = unicode(data, 'utf-8')
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160 tag = u'tag:yaml.org,2002:str'
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161 except UnicodeDecodeError:
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162 data = data.encode('base64')
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163 tag = u'tag:yaml.org,2002:binary'
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164 style = '|'
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165 return self.represent_scalar(tag, data, style=style)
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166
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167 def represent_unicode(self, data):
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168 return self.represent_scalar(u'tag:yaml.org,2002:str', data)
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169
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170 def represent_bool(self, data):
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171 if data:
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172 value = u'true'
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173 else:
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174 value = u'false'
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175 return self.represent_scalar(u'tag:yaml.org,2002:bool', value)
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176
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177 def represent_int(self, data):
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178 return self.represent_scalar(u'tag:yaml.org,2002:int', unicode(data))
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179
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180 def represent_long(self, data):
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181 return self.represent_scalar(u'tag:yaml.org,2002:int', unicode(data))
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182
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183 inf_value = 1e300
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184 while repr(inf_value) != repr(inf_value*inf_value):
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185 inf_value *= inf_value
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186
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187 def represent_float(self, data):
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188 if data != data or (data == 0.0 and data == 1.0):
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189 value = u'.nan'
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190 elif data == self.inf_value:
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191 value = u'.inf'
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192 elif data == -self.inf_value:
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193 value = u'-.inf'
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194 else:
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195 value = unicode(repr(data)).lower()
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196 # Note that in some cases `repr(data)` represents a float number
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197 # without the decimal parts. For instance:
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198 # >>> repr(1e17)
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199 # '1e17'
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200 # Unfortunately, this is not a valid float representation according
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201 # to the definition of the `!!float` tag. We fix this by adding
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202 # '.0' before the 'e' symbol.
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203 if u'.' not in value and u'e' in value:
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204 value = value.replace(u'e', u'.0e', 1)
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205 return self.represent_scalar(u'tag:yaml.org,2002:float', value)
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206
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207 def represent_list(self, data):
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208 #pairs = (len(data) > 0 and isinstance(data, list))
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209 #if pairs:
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210 # for item in data:
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211 # if not isinstance(item, tuple) or len(item) != 2:
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212 # pairs = False
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213 # break
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214 #if not pairs:
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215 return self.represent_sequence(u'tag:yaml.org,2002:seq', data)
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216 #value = []
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217 #for item_key, item_value in data:
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218 # value.append(self.represent_mapping(u'tag:yaml.org,2002:map',
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219 # [(item_key, item_value)]))
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220 #return SequenceNode(u'tag:yaml.org,2002:pairs', value)
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221
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222 def represent_dict(self, data):
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223 return self.represent_mapping(u'tag:yaml.org,2002:map', data)
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224
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225 def represent_set(self, data):
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226 value = {}
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227 for key in data:
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228 value[key] = None
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229 return self.represent_mapping(u'tag:yaml.org,2002:set', value)
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230
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231 def represent_date(self, data):
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232 value = unicode(data.isoformat())
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233 return self.represent_scalar(u'tag:yaml.org,2002:timestamp', value)
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234
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235 def represent_datetime(self, data):
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236 value = unicode(data.isoformat(' '))
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237 return self.represent_scalar(u'tag:yaml.org,2002:timestamp', value)
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238
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239 def represent_yaml_object(self, tag, data, cls, flow_style=None):
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240 if hasattr(data, '__getstate__'):
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241 state = data.__getstate__()
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242 else:
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243 state = data.__dict__.copy()
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244 return self.represent_mapping(tag, state, flow_style=flow_style)
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245
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246 def represent_undefined(self, data):
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247 raise RepresenterError("cannot represent an object: %s" % data)
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248
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249 SafeRepresenter.add_representer(type(None),
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250 SafeRepresenter.represent_none)
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251
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252 SafeRepresenter.add_representer(str,
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253 SafeRepresenter.represent_str)
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254
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255 SafeRepresenter.add_representer(unicode,
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256 SafeRepresenter.represent_unicode)
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257
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258 SafeRepresenter.add_representer(bool,
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259 SafeRepresenter.represent_bool)
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260
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261 SafeRepresenter.add_representer(int,
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262 SafeRepresenter.represent_int)
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263
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264 SafeRepresenter.add_representer(long,
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265 SafeRepresenter.represent_long)
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266
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267 SafeRepresenter.add_representer(float,
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268 SafeRepresenter.represent_float)
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269
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270 SafeRepresenter.add_representer(list,
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271 SafeRepresenter.represent_list)
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272
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273 SafeRepresenter.add_representer(tuple,
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274 SafeRepresenter.represent_list)
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275
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276 SafeRepresenter.add_representer(dict,
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277 SafeRepresenter.represent_dict)
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278
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279 SafeRepresenter.add_representer(set,
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280 SafeRepresenter.represent_set)
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281
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282 SafeRepresenter.add_representer(datetime.date,
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283 SafeRepresenter.represent_date)
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284
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285 SafeRepresenter.add_representer(datetime.datetime,
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286 SafeRepresenter.represent_datetime)
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287
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288 SafeRepresenter.add_representer(None,
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289 SafeRepresenter.represent_undefined)
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290
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291 class Representer(SafeRepresenter):
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292
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293 def represent_str(self, data):
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294 tag = None
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295 style = None
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296 try:
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297 data = unicode(data, 'ascii')
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298 tag = u'tag:yaml.org,2002:str'
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299 except UnicodeDecodeError:
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300 try:
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301 data = unicode(data, 'utf-8')
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302 tag = u'tag:yaml.org,2002:python/str'
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303 except UnicodeDecodeError:
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304 data = data.encode('base64')
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305 tag = u'tag:yaml.org,2002:binary'
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306 style = '|'
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307 return self.represent_scalar(tag, data, style=style)
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308
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309 def represent_unicode(self, data):
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310 tag = None
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311 try:
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312 data.encode('ascii')
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313 tag = u'tag:yaml.org,2002:python/unicode'
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314 except UnicodeEncodeError:
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315 tag = u'tag:yaml.org,2002:str'
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316 return self.represent_scalar(tag, data)
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317
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318 def represent_long(self, data):
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319 tag = u'tag:yaml.org,2002:int'
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320 if int(data) is not data:
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321 tag = u'tag:yaml.org,2002:python/long'
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322 return self.represent_scalar(tag, unicode(data))
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323
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324 def represent_complex(self, data):
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325 if data.imag == 0.0:
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326 data = u'%r' % data.real
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327 elif data.real == 0.0:
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328 data = u'%rj' % data.imag
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329 elif data.imag > 0:
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330 data = u'%r+%rj' % (data.real, data.imag)
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331 else:
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332 data = u'%r%rj' % (data.real, data.imag)
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333 return self.represent_scalar(u'tag:yaml.org,2002:python/complex', data)
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334
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335 def represent_tuple(self, data):
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336 return self.represent_sequence(u'tag:yaml.org,2002:python/tuple', data)
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337
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338 def represent_name(self, data):
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339 name = u'%s.%s' % (data.__module__, data.__name__)
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340 return self.represent_scalar(u'tag:yaml.org,2002:python/name:'+name, u'')
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341
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342 def represent_module(self, data):
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343 return self.represent_scalar(
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344 u'tag:yaml.org,2002:python/module:'+data.__name__, u'')
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345
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346 def represent_instance(self, data):
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347 # For instances of classic classes, we use __getinitargs__ and
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348 # __getstate__ to serialize the data.
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349
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350 # If data.__getinitargs__ exists, the object must be reconstructed by
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351 # calling cls(**args), where args is a tuple returned by
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352 # __getinitargs__. Otherwise, the cls.__init__ method should never be
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353 # called and the class instance is created by instantiating a trivial
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354 # class and assigning to the instance's __class__ variable.
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355
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356 # If data.__getstate__ exists, it returns the state of the object.
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357 # Otherwise, the state of the object is data.__dict__.
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358
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359 # We produce either a !!python/object or !!python/object/new node.
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360 # If data.__getinitargs__ does not exist and state is a dictionary, we
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361 # produce a !!python/object node . Otherwise we produce a
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362 # !!python/object/new node.
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363
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364 cls = data.__class__
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365 class_name = u'%s.%s' % (cls.__module__, cls.__name__)
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366 args = None
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367 state = None
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368 if hasattr(data, '__getinitargs__'):
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369 args = list(data.__getinitargs__())
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370 if hasattr(data, '__getstate__'):
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371 state = data.__getstate__()
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372 else:
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373 state = data.__dict__
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374 if args is None and isinstance(state, dict):
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375 return self.represent_mapping(
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376 u'tag:yaml.org,2002:python/object:'+class_name, state)
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377 if isinstance(state, dict) and not state:
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378 return self.represent_sequence(
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379 u'tag:yaml.org,2002:python/object/new:'+class_name, args)
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380 value = {}
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381 if args:
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382 value['args'] = args
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383 value['state'] = state
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384 return self.represent_mapping(
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385 u'tag:yaml.org,2002:python/object/new:'+class_name, value)
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386
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387 def represent_object(self, data):
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388 # We use __reduce__ API to save the data. data.__reduce__ returns
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389 # a tuple of length 2-5:
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390 # (function, args, state, listitems, dictitems)
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391
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392 # For reconstructing, we calls function(*args), then set its state,
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393 # listitems, and dictitems if they are not None.
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394
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395 # A special case is when function.__name__ == '__newobj__'. In this
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396 # case we create the object with args[0].__new__(*args).
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397
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398 # Another special case is when __reduce__ returns a string - we don't
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399 # support it.
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400
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401 # We produce a !!python/object, !!python/object/new or
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402 # !!python/object/apply node.
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403
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404 cls = type(data)
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405 if cls in copy_reg.dispatch_table:
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406 reduce = copy_reg.dispatch_table[cls](data)
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407 elif hasattr(data, '__reduce_ex__'):
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408 reduce = data.__reduce_ex__(2)
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409 elif hasattr(data, '__reduce__'):
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410 reduce = data.__reduce__()
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411 else:
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412 raise RepresenterError("cannot represent object: %r" % data)
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413 reduce = (list(reduce)+[None]*5)[:5]
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414 function, args, state, listitems, dictitems = reduce
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415 args = list(args)
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416 if state is None:
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417 state = {}
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418 if listitems is not None:
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419 listitems = list(listitems)
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420 if dictitems is not None:
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421 dictitems = dict(dictitems)
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422 if function.__name__ == '__newobj__':
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423 function = args[0]
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424 args = args[1:]
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425 tag = u'tag:yaml.org,2002:python/object/new:'
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426 newobj = True
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427 else:
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428 tag = u'tag:yaml.org,2002:python/object/apply:'
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429 newobj = False
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430 function_name = u'%s.%s' % (function.__module__, function.__name__)
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431 if not args and not listitems and not dictitems \
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432 and isinstance(state, dict) and newobj:
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433 return self.represent_mapping(
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434 u'tag:yaml.org,2002:python/object:'+function_name, state)
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435 if not listitems and not dictitems \
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436 and isinstance(state, dict) and not state:
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437 return self.represent_sequence(tag+function_name, args)
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438 value = {}
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439 if args:
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440 value['args'] = args
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441 if state or not isinstance(state, dict):
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442 value['state'] = state
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443 if listitems:
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444 value['listitems'] = listitems
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445 if dictitems:
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446 value['dictitems'] = dictitems
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447 return self.represent_mapping(tag+function_name, value)
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448
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449 Representer.add_representer(str,
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450 Representer.represent_str)
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451
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452 Representer.add_representer(unicode,
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453 Representer.represent_unicode)
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454
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455 Representer.add_representer(long,
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456 Representer.represent_long)
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457
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458 Representer.add_representer(complex,
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459 Representer.represent_complex)
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460
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461 Representer.add_representer(tuple,
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462 Representer.represent_tuple)
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463
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464 Representer.add_representer(type,
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465 Representer.represent_name)
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466
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467 Representer.add_representer(types.ClassType,
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468 Representer.represent_name)
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469
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470 Representer.add_representer(types.FunctionType,
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471 Representer.represent_name)
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472
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473 Representer.add_representer(types.BuiltinFunctionType,
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474 Representer.represent_name)
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475
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476 Representer.add_representer(types.ModuleType,
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477 Representer.represent_module)
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478
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479 Representer.add_multi_representer(types.InstanceType,
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480 Representer.represent_instance)
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481
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482 Representer.add_multi_representer(object,
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483 Representer.represent_object)
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484