Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/yaml/resolver.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1
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2 __all__ = ['BaseResolver', 'Resolver']
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3
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4 from .error import *
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5 from .nodes import *
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6
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7 import re
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8
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9 class ResolverError(YAMLError):
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10 pass
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11
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12 class BaseResolver:
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13
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14 DEFAULT_SCALAR_TAG = 'tag:yaml.org,2002:str'
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15 DEFAULT_SEQUENCE_TAG = 'tag:yaml.org,2002:seq'
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16 DEFAULT_MAPPING_TAG = 'tag:yaml.org,2002:map'
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17
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18 yaml_implicit_resolvers = {}
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19 yaml_path_resolvers = {}
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20
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21 def __init__(self):
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22 self.resolver_exact_paths = []
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23 self.resolver_prefix_paths = []
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24
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25 @classmethod
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26 def add_implicit_resolver(cls, tag, regexp, first):
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27 if not 'yaml_implicit_resolvers' in cls.__dict__:
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28 implicit_resolvers = {}
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29 for key in cls.yaml_implicit_resolvers:
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30 implicit_resolvers[key] = cls.yaml_implicit_resolvers[key][:]
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31 cls.yaml_implicit_resolvers = implicit_resolvers
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32 if first is None:
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33 first = [None]
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34 for ch in first:
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35 cls.yaml_implicit_resolvers.setdefault(ch, []).append((tag, regexp))
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36
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37 @classmethod
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38 def add_path_resolver(cls, tag, path, kind=None):
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39 # Note: `add_path_resolver` is experimental. The API could be changed.
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40 # `new_path` is a pattern that is matched against the path from the
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41 # root to the node that is being considered. `node_path` elements are
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42 # tuples `(node_check, index_check)`. `node_check` is a node class:
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43 # `ScalarNode`, `SequenceNode`, `MappingNode` or `None`. `None`
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44 # matches any kind of a node. `index_check` could be `None`, a boolean
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45 # value, a string value, or a number. `None` and `False` match against
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46 # any _value_ of sequence and mapping nodes. `True` matches against
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47 # any _key_ of a mapping node. A string `index_check` matches against
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48 # a mapping value that corresponds to a scalar key which content is
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49 # equal to the `index_check` value. An integer `index_check` matches
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50 # against a sequence value with the index equal to `index_check`.
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51 if not 'yaml_path_resolvers' in cls.__dict__:
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52 cls.yaml_path_resolvers = cls.yaml_path_resolvers.copy()
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53 new_path = []
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54 for element in path:
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55 if isinstance(element, (list, tuple)):
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56 if len(element) == 2:
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57 node_check, index_check = element
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58 elif len(element) == 1:
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59 node_check = element[0]
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60 index_check = True
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61 else:
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62 raise ResolverError("Invalid path element: %s" % element)
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63 else:
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64 node_check = None
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65 index_check = element
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66 if node_check is str:
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67 node_check = ScalarNode
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68 elif node_check is list:
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69 node_check = SequenceNode
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70 elif node_check is dict:
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71 node_check = MappingNode
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72 elif node_check not in [ScalarNode, SequenceNode, MappingNode] \
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73 and not isinstance(node_check, str) \
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74 and node_check is not None:
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75 raise ResolverError("Invalid node checker: %s" % node_check)
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76 if not isinstance(index_check, (str, int)) \
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77 and index_check is not None:
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78 raise ResolverError("Invalid index checker: %s" % index_check)
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79 new_path.append((node_check, index_check))
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80 if kind is str:
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81 kind = ScalarNode
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82 elif kind is list:
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83 kind = SequenceNode
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84 elif kind is dict:
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85 kind = MappingNode
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86 elif kind not in [ScalarNode, SequenceNode, MappingNode] \
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87 and kind is not None:
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88 raise ResolverError("Invalid node kind: %s" % kind)
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89 cls.yaml_path_resolvers[tuple(new_path), kind] = tag
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90
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91 def descend_resolver(self, current_node, current_index):
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92 if not self.yaml_path_resolvers:
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93 return
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94 exact_paths = {}
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95 prefix_paths = []
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96 if current_node:
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97 depth = len(self.resolver_prefix_paths)
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98 for path, kind in self.resolver_prefix_paths[-1]:
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99 if self.check_resolver_prefix(depth, path, kind,
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100 current_node, current_index):
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101 if len(path) > depth:
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102 prefix_paths.append((path, kind))
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103 else:
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104 exact_paths[kind] = self.yaml_path_resolvers[path, kind]
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105 else:
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106 for path, kind in self.yaml_path_resolvers:
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107 if not path:
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108 exact_paths[kind] = self.yaml_path_resolvers[path, kind]
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109 else:
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110 prefix_paths.append((path, kind))
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111 self.resolver_exact_paths.append(exact_paths)
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112 self.resolver_prefix_paths.append(prefix_paths)
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113
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114 def ascend_resolver(self):
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115 if not self.yaml_path_resolvers:
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116 return
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117 self.resolver_exact_paths.pop()
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118 self.resolver_prefix_paths.pop()
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119
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120 def check_resolver_prefix(self, depth, path, kind,
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121 current_node, current_index):
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122 node_check, index_check = path[depth-1]
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123 if isinstance(node_check, str):
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124 if current_node.tag != node_check:
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125 return
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126 elif node_check is not None:
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127 if not isinstance(current_node, node_check):
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128 return
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129 if index_check is True and current_index is not None:
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130 return
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131 if (index_check is False or index_check is None) \
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132 and current_index is None:
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133 return
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134 if isinstance(index_check, str):
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135 if not (isinstance(current_index, ScalarNode)
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136 and index_check == current_index.value):
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137 return
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138 elif isinstance(index_check, int) and not isinstance(index_check, bool):
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139 if index_check != current_index:
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140 return
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141 return True
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142
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143 def resolve(self, kind, value, implicit):
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144 if kind is ScalarNode and implicit[0]:
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145 if value == '':
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146 resolvers = self.yaml_implicit_resolvers.get('', [])
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147 else:
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148 resolvers = self.yaml_implicit_resolvers.get(value[0], [])
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149 resolvers += self.yaml_implicit_resolvers.get(None, [])
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150 for tag, regexp in resolvers:
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151 if regexp.match(value):
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152 return tag
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153 implicit = implicit[1]
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154 if self.yaml_path_resolvers:
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155 exact_paths = self.resolver_exact_paths[-1]
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156 if kind in exact_paths:
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157 return exact_paths[kind]
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158 if None in exact_paths:
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159 return exact_paths[None]
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160 if kind is ScalarNode:
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161 return self.DEFAULT_SCALAR_TAG
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162 elif kind is SequenceNode:
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163 return self.DEFAULT_SEQUENCE_TAG
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164 elif kind is MappingNode:
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165 return self.DEFAULT_MAPPING_TAG
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166
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167 class Resolver(BaseResolver):
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168 pass
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169
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170 Resolver.add_implicit_resolver(
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171 'tag:yaml.org,2002:bool',
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172 re.compile(r'''^(?:yes|Yes|YES|no|No|NO
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173 |true|True|TRUE|false|False|FALSE
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174 |on|On|ON|off|Off|OFF)$''', re.X),
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175 list('yYnNtTfFoO'))
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176
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177 Resolver.add_implicit_resolver(
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178 'tag:yaml.org,2002:float',
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179 re.compile(r'''^(?:[-+]?(?:[0-9][0-9_]*)\.[0-9_]*(?:[eE][-+][0-9]+)?
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180 |\.[0-9_]+(?:[eE][-+][0-9]+)?
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181 |[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\.[0-9_]*
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182 |[-+]?\.(?:inf|Inf|INF)
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183 |\.(?:nan|NaN|NAN))$''', re.X),
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184 list('-+0123456789.'))
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185
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186 Resolver.add_implicit_resolver(
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187 'tag:yaml.org,2002:int',
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188 re.compile(r'''^(?:[-+]?0b[0-1_]+
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189 |[-+]?0[0-7_]+
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190 |[-+]?(?:0|[1-9][0-9_]*)
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191 |[-+]?0x[0-9a-fA-F_]+
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192 |[-+]?[1-9][0-9_]*(?::[0-5]?[0-9])+)$''', re.X),
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193 list('-+0123456789'))
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194
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195 Resolver.add_implicit_resolver(
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196 'tag:yaml.org,2002:merge',
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197 re.compile(r'^(?:<<)$'),
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198 ['<'])
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199
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200 Resolver.add_implicit_resolver(
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201 'tag:yaml.org,2002:null',
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parents:
diff changeset
202 re.compile(r'''^(?: ~
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203 |null|Null|NULL
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204 | )$''', re.X),
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205 ['~', 'n', 'N', ''])
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206
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207 Resolver.add_implicit_resolver(
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208 'tag:yaml.org,2002:timestamp',
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diff changeset
209 re.compile(r'''^(?:[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]
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210 |[0-9][0-9][0-9][0-9] -[0-9][0-9]? -[0-9][0-9]?
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211 (?:[Tt]|[ \t]+)[0-9][0-9]?
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212 :[0-9][0-9] :[0-9][0-9] (?:\.[0-9]*)?
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213 (?:[ \t]*(?:Z|[-+][0-9][0-9]?(?::[0-9][0-9])?))?)$''', re.X),
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214 list('0123456789'))
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215
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216 Resolver.add_implicit_resolver(
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217 'tag:yaml.org,2002:value',
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diff changeset
218 re.compile(r'^(?:=)$'),
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219 ['='])
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220
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221 # The following resolver is only for documentation purposes. It cannot work
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222 # because plain scalars cannot start with '!', '&', or '*'.
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223 Resolver.add_implicit_resolver(
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224 'tag:yaml.org,2002:yaml',
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225 re.compile(r'^(?:!|&|\*)$'),
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226 list('!&*'))
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diff changeset
227