Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/yaml/constructor.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__ = ['BaseConstructor', 'SafeConstructor', 'Constructor',
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3 'ConstructorError']
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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 binascii, re, sys, types
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11
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12 class ConstructorError(MarkedYAMLError):
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13 pass
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14
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15 class BaseConstructor(object):
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16
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17 yaml_constructors = {}
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18 yaml_multi_constructors = {}
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19
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20 def __init__(self):
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21 self.constructed_objects = {}
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22 self.recursive_objects = {}
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23 self.state_generators = []
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24 self.deep_construct = False
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25
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26 def check_data(self):
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27 # If there are more documents available?
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28 return self.check_node()
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29
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30 def get_data(self):
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31 # Construct and return the next document.
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32 if self.check_node():
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33 return self.construct_document(self.get_node())
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34
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35 def get_single_data(self):
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36 # Ensure that the stream contains a single document and construct it.
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37 node = self.get_single_node()
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38 if node is not None:
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39 return self.construct_document(node)
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40 return None
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41
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42 def construct_document(self, node):
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43 data = self.construct_object(node)
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44 while self.state_generators:
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45 state_generators = self.state_generators
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46 self.state_generators = []
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47 for generator in state_generators:
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48 for dummy in generator:
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49 pass
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50 self.constructed_objects = {}
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51 self.recursive_objects = {}
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52 self.deep_construct = False
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53 return data
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54
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55 def construct_object(self, node, deep=False):
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56 if node in self.constructed_objects:
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57 return self.constructed_objects[node]
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58 if deep:
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59 old_deep = self.deep_construct
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60 self.deep_construct = True
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61 if node in self.recursive_objects:
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62 raise ConstructorError(None, None,
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63 "found unconstructable recursive node", node.start_mark)
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64 self.recursive_objects[node] = None
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65 constructor = None
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66 tag_suffix = None
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67 if node.tag in self.yaml_constructors:
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68 constructor = self.yaml_constructors[node.tag]
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69 else:
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70 for tag_prefix in self.yaml_multi_constructors:
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71 if node.tag.startswith(tag_prefix):
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72 tag_suffix = node.tag[len(tag_prefix):]
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73 constructor = self.yaml_multi_constructors[tag_prefix]
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74 break
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75 else:
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76 if None in self.yaml_multi_constructors:
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77 tag_suffix = node.tag
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78 constructor = self.yaml_multi_constructors[None]
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79 elif None in self.yaml_constructors:
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80 constructor = self.yaml_constructors[None]
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81 elif isinstance(node, ScalarNode):
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82 constructor = self.__class__.construct_scalar
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83 elif isinstance(node, SequenceNode):
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84 constructor = self.__class__.construct_sequence
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85 elif isinstance(node, MappingNode):
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86 constructor = self.__class__.construct_mapping
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87 if tag_suffix is None:
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88 data = constructor(self, node)
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89 else:
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90 data = constructor(self, tag_suffix, node)
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91 if isinstance(data, types.GeneratorType):
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92 generator = data
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93 data = generator.next()
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94 if self.deep_construct:
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95 for dummy in generator:
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96 pass
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97 else:
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98 self.state_generators.append(generator)
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99 self.constructed_objects[node] = data
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100 del self.recursive_objects[node]
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101 if deep:
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102 self.deep_construct = old_deep
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103 return data
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104
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105 def construct_scalar(self, node):
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106 if not isinstance(node, ScalarNode):
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107 raise ConstructorError(None, None,
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108 "expected a scalar node, but found %s" % node.id,
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109 node.start_mark)
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110 return node.value
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111
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112 def construct_sequence(self, node, deep=False):
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113 if not isinstance(node, SequenceNode):
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114 raise ConstructorError(None, None,
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115 "expected a sequence node, but found %s" % node.id,
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116 node.start_mark)
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117 return [self.construct_object(child, deep=deep)
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118 for child in node.value]
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119
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120 def construct_mapping(self, node, deep=False):
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121 if not isinstance(node, MappingNode):
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122 raise ConstructorError(None, None,
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123 "expected a mapping node, but found %s" % node.id,
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124 node.start_mark)
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125 mapping = {}
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126 for key_node, value_node in node.value:
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127 key = self.construct_object(key_node, deep=deep)
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128 try:
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129 hash(key)
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130 except TypeError, exc:
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131 raise ConstructorError("while constructing a mapping", node.start_mark,
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132 "found unacceptable key (%s)" % exc, key_node.start_mark)
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133 value = self.construct_object(value_node, deep=deep)
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134 mapping[key] = value
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135 return mapping
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136
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137 def construct_pairs(self, node, deep=False):
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138 if not isinstance(node, MappingNode):
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139 raise ConstructorError(None, None,
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140 "expected a mapping node, but found %s" % node.id,
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141 node.start_mark)
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142 pairs = []
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143 for key_node, value_node in node.value:
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144 key = self.construct_object(key_node, deep=deep)
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145 value = self.construct_object(value_node, deep=deep)
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146 pairs.append((key, value))
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147 return pairs
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148
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149 def add_constructor(cls, tag, constructor):
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150 if not 'yaml_constructors' in cls.__dict__:
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151 cls.yaml_constructors = cls.yaml_constructors.copy()
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152 cls.yaml_constructors[tag] = constructor
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153 add_constructor = classmethod(add_constructor)
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154
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155 def add_multi_constructor(cls, tag_prefix, multi_constructor):
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156 if not 'yaml_multi_constructors' in cls.__dict__:
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157 cls.yaml_multi_constructors = cls.yaml_multi_constructors.copy()
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158 cls.yaml_multi_constructors[tag_prefix] = multi_constructor
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159 add_multi_constructor = classmethod(add_multi_constructor)
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160
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161 class SafeConstructor(BaseConstructor):
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162
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163 def construct_scalar(self, node):
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164 if isinstance(node, MappingNode):
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165 for key_node, value_node in node.value:
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166 if key_node.tag == u'tag:yaml.org,2002:value':
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167 return self.construct_scalar(value_node)
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168 return BaseConstructor.construct_scalar(self, node)
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169
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170 def flatten_mapping(self, node):
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171 merge = []
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172 index = 0
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173 while index < len(node.value):
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174 key_node, value_node = node.value[index]
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175 if key_node.tag == u'tag:yaml.org,2002:merge':
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176 del node.value[index]
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177 if isinstance(value_node, MappingNode):
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178 self.flatten_mapping(value_node)
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179 merge.extend(value_node.value)
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180 elif isinstance(value_node, SequenceNode):
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181 submerge = []
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182 for subnode in value_node.value:
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183 if not isinstance(subnode, MappingNode):
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184 raise ConstructorError("while constructing a mapping",
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185 node.start_mark,
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186 "expected a mapping for merging, but found %s"
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187 % subnode.id, subnode.start_mark)
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188 self.flatten_mapping(subnode)
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189 submerge.append(subnode.value)
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190 submerge.reverse()
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191 for value in submerge:
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192 merge.extend(value)
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193 else:
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194 raise ConstructorError("while constructing a mapping", node.start_mark,
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195 "expected a mapping or list of mappings for merging, but found %s"
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196 % value_node.id, value_node.start_mark)
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197 elif key_node.tag == u'tag:yaml.org,2002:value':
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198 key_node.tag = u'tag:yaml.org,2002:str'
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199 index += 1
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200 else:
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201 index += 1
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202 if merge:
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203 node.value = merge + node.value
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204
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205 def construct_mapping(self, node, deep=False):
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206 if isinstance(node, MappingNode):
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207 self.flatten_mapping(node)
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208 return BaseConstructor.construct_mapping(self, node, deep=deep)
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209
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210 def construct_yaml_null(self, node):
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211 self.construct_scalar(node)
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212 return None
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213
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214 bool_values = {
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215 u'yes': True,
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216 u'no': False,
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217 u'true': True,
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218 u'false': False,
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219 u'on': True,
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220 u'off': False,
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221 }
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222
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223 def construct_yaml_bool(self, node):
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224 value = self.construct_scalar(node)
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225 return self.bool_values[value.lower()]
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226
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227 def construct_yaml_int(self, node):
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228 value = str(self.construct_scalar(node))
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229 value = value.replace('_', '')
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230 sign = +1
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231 if value[0] == '-':
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232 sign = -1
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233 if value[0] in '+-':
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234 value = value[1:]
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235 if value == '0':
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236 return 0
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237 elif value.startswith('0b'):
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238 return sign*int(value[2:], 2)
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239 elif value.startswith('0x'):
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240 return sign*int(value[2:], 16)
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241 elif value[0] == '0':
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242 return sign*int(value, 8)
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243 elif ':' in value:
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244 digits = [int(part) for part in value.split(':')]
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245 digits.reverse()
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246 base = 1
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247 value = 0
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248 for digit in digits:
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249 value += digit*base
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250 base *= 60
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251 return sign*value
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252 else:
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253 return sign*int(value)
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254
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255 inf_value = 1e300
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256 while inf_value != inf_value*inf_value:
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257 inf_value *= inf_value
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258 nan_value = -inf_value/inf_value # Trying to make a quiet NaN (like C99).
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259
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260 def construct_yaml_float(self, node):
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261 value = str(self.construct_scalar(node))
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262 value = value.replace('_', '').lower()
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263 sign = +1
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264 if value[0] == '-':
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265 sign = -1
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266 if value[0] in '+-':
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267 value = value[1:]
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268 if value == '.inf':
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269 return sign*self.inf_value
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270 elif value == '.nan':
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271 return self.nan_value
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272 elif ':' in value:
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273 digits = [float(part) for part in value.split(':')]
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274 digits.reverse()
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275 base = 1
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276 value = 0.0
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277 for digit in digits:
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278 value += digit*base
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279 base *= 60
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280 return sign*value
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281 else:
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282 return sign*float(value)
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283
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284 def construct_yaml_binary(self, node):
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285 value = self.construct_scalar(node)
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286 try:
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287 return str(value).decode('base64')
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288 except (binascii.Error, UnicodeEncodeError), exc:
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289 raise ConstructorError(None, None,
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290 "failed to decode base64 data: %s" % exc, node.start_mark)
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291
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292 timestamp_regexp = re.compile(
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293 ur'''^(?P<year>[0-9][0-9][0-9][0-9])
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294 -(?P<month>[0-9][0-9]?)
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295 -(?P<day>[0-9][0-9]?)
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296 (?:(?:[Tt]|[ \t]+)
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297 (?P<hour>[0-9][0-9]?)
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298 :(?P<minute>[0-9][0-9])
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299 :(?P<second>[0-9][0-9])
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300 (?:\.(?P<fraction>[0-9]*))?
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301 (?:[ \t]*(?P<tz>Z|(?P<tz_sign>[-+])(?P<tz_hour>[0-9][0-9]?)
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302 (?::(?P<tz_minute>[0-9][0-9]))?))?)?$''', re.X)
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303
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304 def construct_yaml_timestamp(self, node):
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305 value = self.construct_scalar(node)
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306 match = self.timestamp_regexp.match(node.value)
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307 values = match.groupdict()
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308 year = int(values['year'])
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309 month = int(values['month'])
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310 day = int(values['day'])
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311 if not values['hour']:
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312 return datetime.date(year, month, day)
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313 hour = int(values['hour'])
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314 minute = int(values['minute'])
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315 second = int(values['second'])
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316 fraction = 0
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317 if values['fraction']:
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318 fraction = values['fraction'][:6]
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319 while len(fraction) < 6:
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320 fraction += '0'
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321 fraction = int(fraction)
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322 delta = None
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323 if values['tz_sign']:
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324 tz_hour = int(values['tz_hour'])
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325 tz_minute = int(values['tz_minute'] or 0)
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326 delta = datetime.timedelta(hours=tz_hour, minutes=tz_minute)
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327 if values['tz_sign'] == '-':
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328 delta = -delta
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329 data = datetime.datetime(year, month, day, hour, minute, second, fraction)
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330 if delta:
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331 data -= delta
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332 return data
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333
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334 def construct_yaml_omap(self, node):
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335 # Note: we do not check for duplicate keys, because it's too
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336 # CPU-expensive.
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337 omap = []
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338 yield omap
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339 if not isinstance(node, SequenceNode):
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340 raise ConstructorError("while constructing an ordered map", node.start_mark,
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341 "expected a sequence, but found %s" % node.id, node.start_mark)
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342 for subnode in node.value:
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343 if not isinstance(subnode, MappingNode):
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344 raise ConstructorError("while constructing an ordered map", node.start_mark,
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345 "expected a mapping of length 1, but found %s" % subnode.id,
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346 subnode.start_mark)
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347 if len(subnode.value) != 1:
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348 raise ConstructorError("while constructing an ordered map", node.start_mark,
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349 "expected a single mapping item, but found %d items" % len(subnode.value),
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350 subnode.start_mark)
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351 key_node, value_node = subnode.value[0]
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352 key = self.construct_object(key_node)
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353 value = self.construct_object(value_node)
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354 omap.append((key, value))
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355
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356 def construct_yaml_pairs(self, node):
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357 # Note: the same code as `construct_yaml_omap`.
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358 pairs = []
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359 yield pairs
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360 if not isinstance(node, SequenceNode):
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361 raise ConstructorError("while constructing pairs", node.start_mark,
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362 "expected a sequence, but found %s" % node.id, node.start_mark)
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363 for subnode in node.value:
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364 if not isinstance(subnode, MappingNode):
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365 raise ConstructorError("while constructing pairs", node.start_mark,
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366 "expected a mapping of length 1, but found %s" % subnode.id,
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367 subnode.start_mark)
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368 if len(subnode.value) != 1:
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369 raise ConstructorError("while constructing pairs", node.start_mark,
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370 "expected a single mapping item, but found %d items" % len(subnode.value),
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371 subnode.start_mark)
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372 key_node, value_node = subnode.value[0]
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373 key = self.construct_object(key_node)
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374 value = self.construct_object(value_node)
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375 pairs.append((key, value))
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376
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377 def construct_yaml_set(self, node):
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378 data = set()
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379 yield data
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380 value = self.construct_mapping(node)
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381 data.update(value)
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382
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383 def construct_yaml_str(self, node):
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384 value = self.construct_scalar(node)
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385 try:
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386 return value.encode('ascii')
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387 except UnicodeEncodeError:
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388 return value
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389
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390 def construct_yaml_seq(self, node):
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391 data = []
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392 yield data
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393 data.extend(self.construct_sequence(node))
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394
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395 def construct_yaml_map(self, node):
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396 data = {}
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397 yield data
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398 value = self.construct_mapping(node)
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399 data.update(value)
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400
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401 def construct_yaml_object(self, node, cls):
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402 data = cls.__new__(cls)
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403 yield data
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404 if hasattr(data, '__setstate__'):
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405 state = self.construct_mapping(node, deep=True)
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406 data.__setstate__(state)
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407 else:
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408 state = self.construct_mapping(node)
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409 data.__dict__.update(state)
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410
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411 def construct_undefined(self, node):
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412 raise ConstructorError(None, None,
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413 "could not determine a constructor for the tag %r" % node.tag.encode('utf-8'),
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414 node.start_mark)
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415
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416 SafeConstructor.add_constructor(
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417 u'tag:yaml.org,2002:null',
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418 SafeConstructor.construct_yaml_null)
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419
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420 SafeConstructor.add_constructor(
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421 u'tag:yaml.org,2002:bool',
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422 SafeConstructor.construct_yaml_bool)
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423
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424 SafeConstructor.add_constructor(
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425 u'tag:yaml.org,2002:int',
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426 SafeConstructor.construct_yaml_int)
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427
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428 SafeConstructor.add_constructor(
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429 u'tag:yaml.org,2002:float',
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430 SafeConstructor.construct_yaml_float)
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431
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432 SafeConstructor.add_constructor(
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433 u'tag:yaml.org,2002:binary',
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434 SafeConstructor.construct_yaml_binary)
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435
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436 SafeConstructor.add_constructor(
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437 u'tag:yaml.org,2002:timestamp',
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438 SafeConstructor.construct_yaml_timestamp)
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439
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440 SafeConstructor.add_constructor(
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441 u'tag:yaml.org,2002:omap',
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442 SafeConstructor.construct_yaml_omap)
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443
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444 SafeConstructor.add_constructor(
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445 u'tag:yaml.org,2002:pairs',
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446 SafeConstructor.construct_yaml_pairs)
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447
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448 SafeConstructor.add_constructor(
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449 u'tag:yaml.org,2002:set',
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450 SafeConstructor.construct_yaml_set)
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451
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452 SafeConstructor.add_constructor(
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453 u'tag:yaml.org,2002:str',
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454 SafeConstructor.construct_yaml_str)
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455
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456 SafeConstructor.add_constructor(
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457 u'tag:yaml.org,2002:seq',
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458 SafeConstructor.construct_yaml_seq)
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459
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460 SafeConstructor.add_constructor(
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461 u'tag:yaml.org,2002:map',
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462 SafeConstructor.construct_yaml_map)
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463
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464 SafeConstructor.add_constructor(None,
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465 SafeConstructor.construct_undefined)
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466
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467 class Constructor(SafeConstructor):
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468
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469 def construct_python_str(self, node):
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470 return self.construct_scalar(node).encode('utf-8')
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471
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472 def construct_python_unicode(self, node):
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473 return self.construct_scalar(node)
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474
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475 def construct_python_long(self, node):
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476 return long(self.construct_yaml_int(node))
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477
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478 def construct_python_complex(self, node):
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479 return complex(self.construct_scalar(node))
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480
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481 def construct_python_tuple(self, node):
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482 return tuple(self.construct_sequence(node))
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483
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484 def find_python_module(self, name, mark):
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485 if not name:
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486 raise ConstructorError("while constructing a Python module", mark,
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487 "expected non-empty name appended to the tag", mark)
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488 try:
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489 __import__(name)
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490 except ImportError, exc:
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491 raise ConstructorError("while constructing a Python module", mark,
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492 "cannot find module %r (%s)" % (name.encode('utf-8'), exc), mark)
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493 return sys.modules[name]
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494
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495 def find_python_name(self, name, mark):
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496 if not name:
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497 raise ConstructorError("while constructing a Python object", mark,
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498 "expected non-empty name appended to the tag", mark)
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499 if u'.' in name:
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500 module_name, object_name = name.rsplit('.', 1)
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501 else:
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502 module_name = '__builtin__'
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503 object_name = name
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504 try:
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505 __import__(module_name)
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506 except ImportError, exc:
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507 raise ConstructorError("while constructing a Python object", mark,
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508 "cannot find module %r (%s)" % (module_name.encode('utf-8'), exc), mark)
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509 module = sys.modules[module_name]
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510 if not hasattr(module, object_name):
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511 raise ConstructorError("while constructing a Python object", mark,
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512 "cannot find %r in the module %r" % (object_name.encode('utf-8'),
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513 module.__name__), mark)
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514 return getattr(module, object_name)
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515
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516 def construct_python_name(self, suffix, node):
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517 value = self.construct_scalar(node)
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518 if value:
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519 raise ConstructorError("while constructing a Python name", node.start_mark,
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520 "expected the empty value, but found %r" % value.encode('utf-8'),
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521 node.start_mark)
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522 return self.find_python_name(suffix, node.start_mark)
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523
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524 def construct_python_module(self, suffix, node):
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525 value = self.construct_scalar(node)
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526 if value:
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527 raise ConstructorError("while constructing a Python module", node.start_mark,
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528 "expected the empty value, but found %r" % value.encode('utf-8'),
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529 node.start_mark)
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530 return self.find_python_module(suffix, node.start_mark)
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531
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532 class classobj: pass
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533
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534 def make_python_instance(self, suffix, node,
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535 args=None, kwds=None, newobj=False):
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536 if not args:
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537 args = []
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538 if not kwds:
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539 kwds = {}
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540 cls = self.find_python_name(suffix, node.start_mark)
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541 if newobj and isinstance(cls, type(self.classobj)) \
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542 and not args and not kwds:
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543 instance = self.classobj()
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544 instance.__class__ = cls
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545 return instance
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546 elif newobj and isinstance(cls, type):
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547 return cls.__new__(cls, *args, **kwds)
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548 else:
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549 return cls(*args, **kwds)
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550
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551 def set_python_instance_state(self, instance, state):
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552 if hasattr(instance, '__setstate__'):
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553 instance.__setstate__(state)
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554 else:
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555 slotstate = {}
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556 if isinstance(state, tuple) and len(state) == 2:
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557 state, slotstate = state
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558 if hasattr(instance, '__dict__'):
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559 instance.__dict__.update(state)
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560 elif state:
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561 slotstate.update(state)
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562 for key, value in slotstate.items():
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563 setattr(object, key, value)
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564
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565 def construct_python_object(self, suffix, node):
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566 # Format:
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567 # !!python/object:module.name { ... state ... }
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568 instance = self.make_python_instance(suffix, node, newobj=True)
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569 yield instance
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570 deep = hasattr(instance, '__setstate__')
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571 state = self.construct_mapping(node, deep=deep)
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572 self.set_python_instance_state(instance, state)
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573
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574 def construct_python_object_apply(self, suffix, node, newobj=False):
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575 # Format:
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576 # !!python/object/apply # (or !!python/object/new)
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577 # args: [ ... arguments ... ]
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578 # kwds: { ... keywords ... }
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579 # state: ... state ...
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580 # listitems: [ ... listitems ... ]
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581 # dictitems: { ... dictitems ... }
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582 # or short format:
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583 # !!python/object/apply [ ... arguments ... ]
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584 # The difference between !!python/object/apply and !!python/object/new
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585 # is how an object is created, check make_python_instance for details.
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586 if isinstance(node, SequenceNode):
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587 args = self.construct_sequence(node, deep=True)
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588 kwds = {}
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589 state = {}
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590 listitems = []
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591 dictitems = {}
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592 else:
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593 value = self.construct_mapping(node, deep=True)
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594 args = value.get('args', [])
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595 kwds = value.get('kwds', {})
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596 state = value.get('state', {})
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597 listitems = value.get('listitems', [])
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598 dictitems = value.get('dictitems', {})
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599 instance = self.make_python_instance(suffix, node, args, kwds, newobj)
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600 if state:
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601 self.set_python_instance_state(instance, state)
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602 if listitems:
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603 instance.extend(listitems)
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604 if dictitems:
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605 for key in dictitems:
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606 instance[key] = dictitems[key]
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607 return instance
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608
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609 def construct_python_object_new(self, suffix, node):
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610 return self.construct_python_object_apply(suffix, node, newobj=True)
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611
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612 Constructor.add_constructor(
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613 u'tag:yaml.org,2002:python/none',
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614 Constructor.construct_yaml_null)
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615
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616 Constructor.add_constructor(
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617 u'tag:yaml.org,2002:python/bool',
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618 Constructor.construct_yaml_bool)
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619
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620 Constructor.add_constructor(
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621 u'tag:yaml.org,2002:python/str',
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622 Constructor.construct_python_str)
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623
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624 Constructor.add_constructor(
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625 u'tag:yaml.org,2002:python/unicode',
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626 Constructor.construct_python_unicode)
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627
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628 Constructor.add_constructor(
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629 u'tag:yaml.org,2002:python/int',
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630 Constructor.construct_yaml_int)
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631
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632 Constructor.add_constructor(
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633 u'tag:yaml.org,2002:python/long',
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634 Constructor.construct_python_long)
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635
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636 Constructor.add_constructor(
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637 u'tag:yaml.org,2002:python/float',
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638 Constructor.construct_yaml_float)
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639
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640 Constructor.add_constructor(
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641 u'tag:yaml.org,2002:python/complex',
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642 Constructor.construct_python_complex)
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643
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644 Constructor.add_constructor(
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645 u'tag:yaml.org,2002:python/list',
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646 Constructor.construct_yaml_seq)
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647
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648 Constructor.add_constructor(
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649 u'tag:yaml.org,2002:python/tuple',
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650 Constructor.construct_python_tuple)
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651
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652 Constructor.add_constructor(
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653 u'tag:yaml.org,2002:python/dict',
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654 Constructor.construct_yaml_map)
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655
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656 Constructor.add_multi_constructor(
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657 u'tag:yaml.org,2002:python/name:',
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658 Constructor.construct_python_name)
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659
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660 Constructor.add_multi_constructor(
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661 u'tag:yaml.org,2002:python/module:',
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662 Constructor.construct_python_module)
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663
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664 Constructor.add_multi_constructor(
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665 u'tag:yaml.org,2002:python/object:',
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666 Constructor.construct_python_object)
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667
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668 Constructor.add_multi_constructor(
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669 u'tag:yaml.org,2002:python/object/apply:',
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670 Constructor.construct_python_object_apply)
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671
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672 Constructor.add_multi_constructor(
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673 u'tag:yaml.org,2002:python/object/new:',
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674 Constructor.construct_python_object_new)
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675