Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/yaml/resolver.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__ = ['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(object):
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13
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14 DEFAULT_SCALAR_TAG = u'tag:yaml.org,2002:str'
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15 DEFAULT_SEQUENCE_TAG = u'tag:yaml.org,2002:seq'
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16 DEFAULT_MAPPING_TAG = u'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 def add_implicit_resolver(cls, tag, regexp, first):
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26 if not 'yaml_implicit_resolvers' in cls.__dict__:
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27 cls.yaml_implicit_resolvers = cls.yaml_implicit_resolvers.copy()
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28 if first is None:
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29 first = [None]
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30 for ch in first:
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31 cls.yaml_implicit_resolvers.setdefault(ch, []).append((tag, regexp))
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32 add_implicit_resolver = classmethod(add_implicit_resolver)
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33
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34 def add_path_resolver(cls, tag, path, kind=None):
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35 # Note: `add_path_resolver` is experimental. The API could be changed.
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36 # `new_path` is a pattern that is matched against the path from the
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37 # root to the node that is being considered. `node_path` elements are
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38 # tuples `(node_check, index_check)`. `node_check` is a node class:
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39 # `ScalarNode`, `SequenceNode`, `MappingNode` or `None`. `None`
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40 # matches any kind of a node. `index_check` could be `None`, a boolean
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41 # value, a string value, or a number. `None` and `False` match against
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42 # any _value_ of sequence and mapping nodes. `True` matches against
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43 # any _key_ of a mapping node. A string `index_check` matches against
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44 # a mapping value that corresponds to a scalar key which content is
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45 # equal to the `index_check` value. An integer `index_check` matches
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46 # against a sequence value with the index equal to `index_check`.
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47 if not 'yaml_path_resolvers' in cls.__dict__:
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48 cls.yaml_path_resolvers = cls.yaml_path_resolvers.copy()
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49 new_path = []
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50 for element in path:
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51 if isinstance(element, (list, tuple)):
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52 if len(element) == 2:
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53 node_check, index_check = element
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54 elif len(element) == 1:
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55 node_check = element[0]
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56 index_check = True
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57 else:
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58 raise ResolverError("Invalid path element: %s" % element)
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59 else:
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60 node_check = None
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61 index_check = element
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62 if node_check is str:
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63 node_check = ScalarNode
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64 elif node_check is list:
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65 node_check = SequenceNode
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66 elif node_check is dict:
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67 node_check = MappingNode
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68 elif node_check not in [ScalarNode, SequenceNode, MappingNode] \
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69 and not isinstance(node_check, basestring) \
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70 and node_check is not None:
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71 raise ResolverError("Invalid node checker: %s" % node_check)
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72 if not isinstance(index_check, (basestring, int)) \
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73 and index_check is not None:
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74 raise ResolverError("Invalid index checker: %s" % index_check)
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75 new_path.append((node_check, index_check))
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76 if kind is str:
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77 kind = ScalarNode
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78 elif kind is list:
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79 kind = SequenceNode
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80 elif kind is dict:
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81 kind = MappingNode
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82 elif kind not in [ScalarNode, SequenceNode, MappingNode] \
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83 and kind is not None:
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84 raise ResolverError("Invalid node kind: %s" % kind)
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85 cls.yaml_path_resolvers[tuple(new_path), kind] = tag
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86 add_path_resolver = classmethod(add_path_resolver)
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87
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88 def descend_resolver(self, current_node, current_index):
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89 if not self.yaml_path_resolvers:
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90 return
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91 exact_paths = {}
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92 prefix_paths = []
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93 if current_node:
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94 depth = len(self.resolver_prefix_paths)
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95 for path, kind in self.resolver_prefix_paths[-1]:
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96 if self.check_resolver_prefix(depth, path, kind,
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97 current_node, current_index):
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98 if len(path) > depth:
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99 prefix_paths.append((path, kind))
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100 else:
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101 exact_paths[kind] = self.yaml_path_resolvers[path, kind]
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102 else:
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103 for path, kind in self.yaml_path_resolvers:
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104 if not path:
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105 exact_paths[kind] = self.yaml_path_resolvers[path, kind]
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106 else:
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107 prefix_paths.append((path, kind))
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108 self.resolver_exact_paths.append(exact_paths)
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109 self.resolver_prefix_paths.append(prefix_paths)
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110
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111 def ascend_resolver(self):
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112 if not self.yaml_path_resolvers:
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113 return
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114 self.resolver_exact_paths.pop()
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115 self.resolver_prefix_paths.pop()
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116
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117 def check_resolver_prefix(self, depth, path, kind,
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118 current_node, current_index):
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119 node_check, index_check = path[depth-1]
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120 if isinstance(node_check, basestring):
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121 if current_node.tag != node_check:
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122 return
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123 elif node_check is not None:
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124 if not isinstance(current_node, node_check):
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125 return
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126 if index_check is True and current_index is not None:
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127 return
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128 if (index_check is False or index_check is None) \
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129 and current_index is None:
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130 return
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131 if isinstance(index_check, basestring):
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132 if not (isinstance(current_index, ScalarNode)
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133 and index_check == current_index.value):
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134 return
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135 elif isinstance(index_check, int) and not isinstance(index_check, bool):
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136 if index_check != current_index:
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137 return
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138 return True
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139
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140 def resolve(self, kind, value, implicit):
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141 if kind is ScalarNode and implicit[0]:
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142 if value == u'':
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143 resolvers = self.yaml_implicit_resolvers.get(u'', [])
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144 else:
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145 resolvers = self.yaml_implicit_resolvers.get(value[0], [])
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146 resolvers += self.yaml_implicit_resolvers.get(None, [])
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147 for tag, regexp in resolvers:
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148 if regexp.match(value):
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149 return tag
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150 implicit = implicit[1]
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151 if self.yaml_path_resolvers:
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152 exact_paths = self.resolver_exact_paths[-1]
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153 if kind in exact_paths:
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154 return exact_paths[kind]
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155 if None in exact_paths:
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156 return exact_paths[None]
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157 if kind is ScalarNode:
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158 return self.DEFAULT_SCALAR_TAG
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159 elif kind is SequenceNode:
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160 return self.DEFAULT_SEQUENCE_TAG
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161 elif kind is MappingNode:
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162 return self.DEFAULT_MAPPING_TAG
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163
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164 class Resolver(BaseResolver):
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165 pass
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166
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167 Resolver.add_implicit_resolver(
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168 u'tag:yaml.org,2002:bool',
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169 re.compile(ur'''^(?:yes|Yes|YES|no|No|NO
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170 |true|True|TRUE|false|False|FALSE
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171 |on|On|ON|off|Off|OFF)$''', re.X),
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172 list(u'yYnNtTfFoO'))
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173
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174 Resolver.add_implicit_resolver(
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175 u'tag:yaml.org,2002:float',
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176 re.compile(ur'''^(?:[-+]?(?:[0-9][0-9_]*)\.[0-9_]*(?:[eE][-+][0-9]+)?
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177 |\.[0-9_]+(?:[eE][-+][0-9]+)?
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178 |[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\.[0-9_]*
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179 |[-+]?\.(?:inf|Inf|INF)
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180 |\.(?:nan|NaN|NAN))$''', re.X),
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181 list(u'-+0123456789.'))
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182
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183 Resolver.add_implicit_resolver(
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184 u'tag:yaml.org,2002:int',
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185 re.compile(ur'''^(?:[-+]?0b[0-1_]+
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186 |[-+]?0[0-7_]+
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187 |[-+]?(?:0|[1-9][0-9_]*)
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188 |[-+]?0x[0-9a-fA-F_]+
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189 |[-+]?[1-9][0-9_]*(?::[0-5]?[0-9])+)$''', re.X),
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190 list(u'-+0123456789'))
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191
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192 Resolver.add_implicit_resolver(
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193 u'tag:yaml.org,2002:merge',
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194 re.compile(ur'^(?:<<)$'),
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195 [u'<'])
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196
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197 Resolver.add_implicit_resolver(
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198 u'tag:yaml.org,2002:null',
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199 re.compile(ur'''^(?: ~
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200 |null|Null|NULL
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201 | )$''', re.X),
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202 [u'~', u'n', u'N', u''])
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203
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204 Resolver.add_implicit_resolver(
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205 u'tag:yaml.org,2002:timestamp',
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206 re.compile(ur'''^(?:[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]
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207 |[0-9][0-9][0-9][0-9] -[0-9][0-9]? -[0-9][0-9]?
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208 (?:[Tt]|[ \t]+)[0-9][0-9]?
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209 :[0-9][0-9] :[0-9][0-9] (?:\.[0-9]*)?
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210 (?:[ \t]*(?:Z|[-+][0-9][0-9]?(?::[0-9][0-9])?))?)$''', re.X),
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211 list(u'0123456789'))
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212
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213 Resolver.add_implicit_resolver(
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214 u'tag:yaml.org,2002:value',
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215 re.compile(ur'^(?:=)$'),
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216 [u'='])
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217
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218 # The following resolver is only for documentation purposes. It cannot work
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219 # because plain scalars cannot start with '!', '&', or '*'.
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220 Resolver.add_implicit_resolver(
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221 u'tag:yaml.org,2002:yaml',
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222 re.compile(ur'^(?:!|&|\*)$'),
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223 list(u'!&*'))
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224