676 lines
25 KiB
Python
676 lines
25 KiB
Python
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__all__ = ['BaseConstructor', 'SafeConstructor', 'Constructor',
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'ConstructorError']
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from error import *
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from nodes import *
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import datetime
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import binascii, re, sys, types
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class ConstructorError(MarkedYAMLError):
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pass
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class BaseConstructor(object):
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yaml_constructors = {}
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yaml_multi_constructors = {}
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def __init__(self):
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self.constructed_objects = {}
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self.recursive_objects = {}
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self.state_generators = []
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self.deep_construct = False
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def check_data(self):
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# If there are more documents available?
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return self.check_node()
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def get_data(self):
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# Construct and return the next document.
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if self.check_node():
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return self.construct_document(self.get_node())
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def get_single_data(self):
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# Ensure that the stream contains a single document and construct it.
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node = self.get_single_node()
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if node is not None:
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return self.construct_document(node)
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return None
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def construct_document(self, node):
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data = self.construct_object(node)
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while self.state_generators:
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state_generators = self.state_generators
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self.state_generators = []
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for generator in state_generators:
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for dummy in generator:
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pass
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self.constructed_objects = {}
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self.recursive_objects = {}
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self.deep_construct = False
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return data
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def construct_object(self, node, deep=False):
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if node in self.constructed_objects:
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return self.constructed_objects[node]
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if deep:
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old_deep = self.deep_construct
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self.deep_construct = True
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if node in self.recursive_objects:
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raise ConstructorError(None, None,
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"found unconstructable recursive node", node.start_mark)
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self.recursive_objects[node] = None
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constructor = None
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tag_suffix = None
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if node.tag in self.yaml_constructors:
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constructor = self.yaml_constructors[node.tag]
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else:
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for tag_prefix in self.yaml_multi_constructors:
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if node.tag.startswith(tag_prefix):
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tag_suffix = node.tag[len(tag_prefix):]
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constructor = self.yaml_multi_constructors[tag_prefix]
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break
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else:
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if None in self.yaml_multi_constructors:
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tag_suffix = node.tag
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constructor = self.yaml_multi_constructors[None]
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elif None in self.yaml_constructors:
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constructor = self.yaml_constructors[None]
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elif isinstance(node, ScalarNode):
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constructor = self.__class__.construct_scalar
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elif isinstance(node, SequenceNode):
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constructor = self.__class__.construct_sequence
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elif isinstance(node, MappingNode):
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constructor = self.__class__.construct_mapping
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if tag_suffix is None:
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data = constructor(self, node)
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else:
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data = constructor(self, tag_suffix, node)
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if isinstance(data, types.GeneratorType):
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generator = data
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data = generator.next()
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if self.deep_construct:
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for dummy in generator:
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pass
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else:
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self.state_generators.append(generator)
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self.constructed_objects[node] = data
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del self.recursive_objects[node]
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if deep:
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self.deep_construct = old_deep
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return data
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def construct_scalar(self, node):
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if not isinstance(node, ScalarNode):
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raise ConstructorError(None, None,
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"expected a scalar node, but found %s" % node.id,
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node.start_mark)
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return node.value
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def construct_sequence(self, node, deep=False):
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if not isinstance(node, SequenceNode):
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raise ConstructorError(None, None,
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"expected a sequence node, but found %s" % node.id,
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node.start_mark)
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return [self.construct_object(child, deep=deep)
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for child in node.value]
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def construct_mapping(self, node, deep=False):
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if not isinstance(node, MappingNode):
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raise ConstructorError(None, None,
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"expected a mapping node, but found %s" % node.id,
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node.start_mark)
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mapping = {}
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for key_node, value_node in node.value:
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key = self.construct_object(key_node, deep=deep)
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try:
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hash(key)
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except TypeError, exc:
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raise ConstructorError("while constructing a mapping", node.start_mark,
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"found unacceptable key (%s)" % exc, key_node.start_mark)
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value = self.construct_object(value_node, deep=deep)
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mapping[key] = value
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return mapping
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def construct_pairs(self, node, deep=False):
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if not isinstance(node, MappingNode):
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raise ConstructorError(None, None,
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"expected a mapping node, but found %s" % node.id,
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node.start_mark)
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pairs = []
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for key_node, value_node in node.value:
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key = self.construct_object(key_node, deep=deep)
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value = self.construct_object(value_node, deep=deep)
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pairs.append((key, value))
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return pairs
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def add_constructor(cls, tag, constructor):
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if not 'yaml_constructors' in cls.__dict__:
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cls.yaml_constructors = cls.yaml_constructors.copy()
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cls.yaml_constructors[tag] = constructor
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add_constructor = classmethod(add_constructor)
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def add_multi_constructor(cls, tag_prefix, multi_constructor):
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if not 'yaml_multi_constructors' in cls.__dict__:
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cls.yaml_multi_constructors = cls.yaml_multi_constructors.copy()
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cls.yaml_multi_constructors[tag_prefix] = multi_constructor
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add_multi_constructor = classmethod(add_multi_constructor)
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class SafeConstructor(BaseConstructor):
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def construct_scalar(self, node):
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if isinstance(node, MappingNode):
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for key_node, value_node in node.value:
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if key_node.tag == u'tag:yaml.org,2002:value':
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return self.construct_scalar(value_node)
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return BaseConstructor.construct_scalar(self, node)
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def flatten_mapping(self, node):
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merge = []
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index = 0
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while index < len(node.value):
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key_node, value_node = node.value[index]
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if key_node.tag == u'tag:yaml.org,2002:merge':
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del node.value[index]
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if isinstance(value_node, MappingNode):
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self.flatten_mapping(value_node)
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merge.extend(value_node.value)
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elif isinstance(value_node, SequenceNode):
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submerge = []
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for subnode in value_node.value:
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if not isinstance(subnode, MappingNode):
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raise ConstructorError("while constructing a mapping",
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node.start_mark,
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"expected a mapping for merging, but found %s"
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% subnode.id, subnode.start_mark)
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self.flatten_mapping(subnode)
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submerge.append(subnode.value)
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submerge.reverse()
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for value in submerge:
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merge.extend(value)
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else:
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raise ConstructorError("while constructing a mapping", node.start_mark,
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"expected a mapping or list of mappings for merging, but found %s"
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% value_node.id, value_node.start_mark)
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elif key_node.tag == u'tag:yaml.org,2002:value':
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key_node.tag = u'tag:yaml.org,2002:str'
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index += 1
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else:
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index += 1
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if merge:
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node.value = merge + node.value
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def construct_mapping(self, node, deep=False):
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if isinstance(node, MappingNode):
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self.flatten_mapping(node)
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return BaseConstructor.construct_mapping(self, node, deep=deep)
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def construct_yaml_null(self, node):
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self.construct_scalar(node)
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return None
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bool_values = {
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u'yes': True,
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u'no': False,
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u'true': True,
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u'false': False,
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u'on': True,
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u'off': False,
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}
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def construct_yaml_bool(self, node):
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value = self.construct_scalar(node)
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return self.bool_values[value.lower()]
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def construct_yaml_int(self, node):
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value = str(self.construct_scalar(node))
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value = value.replace('_', '')
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sign = +1
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if value[0] == '-':
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sign = -1
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if value[0] in '+-':
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value = value[1:]
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if value == '0':
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return 0
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elif value.startswith('0b'):
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return sign*int(value[2:], 2)
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elif value.startswith('0x'):
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return sign*int(value[2:], 16)
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elif value[0] == '0':
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return sign*int(value, 8)
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elif ':' in value:
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digits = [int(part) for part in value.split(':')]
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digits.reverse()
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base = 1
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value = 0
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for digit in digits:
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value += digit*base
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base *= 60
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return sign*value
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else:
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return sign*int(value)
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inf_value = 1e300
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while inf_value != inf_value*inf_value:
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inf_value *= inf_value
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nan_value = -inf_value/inf_value # Trying to make a quiet NaN (like C99).
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def construct_yaml_float(self, node):
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value = str(self.construct_scalar(node))
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value = value.replace('_', '').lower()
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sign = +1
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if value[0] == '-':
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sign = -1
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if value[0] in '+-':
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value = value[1:]
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if value == '.inf':
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return sign*self.inf_value
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elif value == '.nan':
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return self.nan_value
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elif ':' in value:
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digits = [float(part) for part in value.split(':')]
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digits.reverse()
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base = 1
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value = 0.0
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for digit in digits:
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value += digit*base
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base *= 60
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return sign*value
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else:
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return sign*float(value)
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def construct_yaml_binary(self, node):
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value = self.construct_scalar(node)
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try:
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return str(value).decode('base64')
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except (binascii.Error, UnicodeEncodeError), exc:
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raise ConstructorError(None, None,
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"failed to decode base64 data: %s" % exc, node.start_mark)
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timestamp_regexp = re.compile(
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ur'''^(?P<year>[0-9][0-9][0-9][0-9])
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-(?P<month>[0-9][0-9]?)
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-(?P<day>[0-9][0-9]?)
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(?:(?:[Tt]|[ \t]+)
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(?P<hour>[0-9][0-9]?)
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:(?P<minute>[0-9][0-9])
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:(?P<second>[0-9][0-9])
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(?:\.(?P<fraction>[0-9]*))?
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(?:[ \t]*(?P<tz>Z|(?P<tz_sign>[-+])(?P<tz_hour>[0-9][0-9]?)
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(?::(?P<tz_minute>[0-9][0-9]))?))?)?$''', re.X)
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def construct_yaml_timestamp(self, node):
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value = self.construct_scalar(node)
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match = self.timestamp_regexp.match(node.value)
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values = match.groupdict()
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year = int(values['year'])
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month = int(values['month'])
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day = int(values['day'])
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if not values['hour']:
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return datetime.date(year, month, day)
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hour = int(values['hour'])
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minute = int(values['minute'])
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second = int(values['second'])
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fraction = 0
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if values['fraction']:
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fraction = values['fraction'][:6]
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while len(fraction) < 6:
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fraction += '0'
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fraction = int(fraction)
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delta = None
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if values['tz_sign']:
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tz_hour = int(values['tz_hour'])
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tz_minute = int(values['tz_minute'] or 0)
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delta = datetime.timedelta(hours=tz_hour, minutes=tz_minute)
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if values['tz_sign'] == '-':
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delta = -delta
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data = datetime.datetime(year, month, day, hour, minute, second, fraction)
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if delta:
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data -= delta
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return data
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def construct_yaml_omap(self, node):
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# Note: we do not check for duplicate keys, because it's too
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# CPU-expensive.
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omap = []
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yield omap
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if not isinstance(node, SequenceNode):
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raise ConstructorError("while constructing an ordered map", node.start_mark,
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"expected a sequence, but found %s" % node.id, node.start_mark)
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for subnode in node.value:
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if not isinstance(subnode, MappingNode):
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raise ConstructorError("while constructing an ordered map", node.start_mark,
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"expected a mapping of length 1, but found %s" % subnode.id,
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subnode.start_mark)
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if len(subnode.value) != 1:
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raise ConstructorError("while constructing an ordered map", node.start_mark,
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"expected a single mapping item, but found %d items" % len(subnode.value),
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subnode.start_mark)
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key_node, value_node = subnode.value[0]
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key = self.construct_object(key_node)
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value = self.construct_object(value_node)
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omap.append((key, value))
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def construct_yaml_pairs(self, node):
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# Note: the same code as `construct_yaml_omap`.
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pairs = []
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yield pairs
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if not isinstance(node, SequenceNode):
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raise ConstructorError("while constructing pairs", node.start_mark,
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"expected a sequence, but found %s" % node.id, node.start_mark)
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for subnode in node.value:
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if not isinstance(subnode, MappingNode):
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raise ConstructorError("while constructing pairs", node.start_mark,
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"expected a mapping of length 1, but found %s" % subnode.id,
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subnode.start_mark)
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if len(subnode.value) != 1:
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raise ConstructorError("while constructing pairs", node.start_mark,
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"expected a single mapping item, but found %d items" % len(subnode.value),
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subnode.start_mark)
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key_node, value_node = subnode.value[0]
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key = self.construct_object(key_node)
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value = self.construct_object(value_node)
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pairs.append((key, value))
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def construct_yaml_set(self, node):
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data = set()
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yield data
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value = self.construct_mapping(node)
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data.update(value)
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def construct_yaml_str(self, node):
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value = self.construct_scalar(node)
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try:
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return value.encode('ascii')
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except UnicodeEncodeError:
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return value
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def construct_yaml_seq(self, node):
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data = []
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yield data
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data.extend(self.construct_sequence(node))
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def construct_yaml_map(self, node):
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data = {}
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yield data
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value = self.construct_mapping(node)
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data.update(value)
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def construct_yaml_object(self, node, cls):
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data = cls.__new__(cls)
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yield data
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if hasattr(data, '__setstate__'):
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state = self.construct_mapping(node, deep=True)
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data.__setstate__(state)
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else:
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state = self.construct_mapping(node)
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data.__dict__.update(state)
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def construct_undefined(self, node):
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raise ConstructorError(None, None,
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"could not determine a constructor for the tag %r" % node.tag.encode('utf-8'),
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node.start_mark)
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SafeConstructor.add_constructor(
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u'tag:yaml.org,2002:null',
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SafeConstructor.construct_yaml_null)
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SafeConstructor.add_constructor(
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u'tag:yaml.org,2002:bool',
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SafeConstructor.construct_yaml_bool)
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SafeConstructor.add_constructor(
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u'tag:yaml.org,2002:int',
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SafeConstructor.construct_yaml_int)
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SafeConstructor.add_constructor(
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u'tag:yaml.org,2002:float',
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SafeConstructor.construct_yaml_float)
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SafeConstructor.add_constructor(
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u'tag:yaml.org,2002:binary',
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SafeConstructor.construct_yaml_binary)
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SafeConstructor.add_constructor(
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u'tag:yaml.org,2002:timestamp',
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SafeConstructor.construct_yaml_timestamp)
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SafeConstructor.add_constructor(
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u'tag:yaml.org,2002:omap',
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SafeConstructor.construct_yaml_omap)
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SafeConstructor.add_constructor(
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u'tag:yaml.org,2002:pairs',
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SafeConstructor.construct_yaml_pairs)
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SafeConstructor.add_constructor(
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u'tag:yaml.org,2002:set',
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SafeConstructor.construct_yaml_set)
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SafeConstructor.add_constructor(
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u'tag:yaml.org,2002:str',
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SafeConstructor.construct_yaml_str)
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SafeConstructor.add_constructor(
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u'tag:yaml.org,2002:seq',
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SafeConstructor.construct_yaml_seq)
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SafeConstructor.add_constructor(
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u'tag:yaml.org,2002:map',
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SafeConstructor.construct_yaml_map)
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SafeConstructor.add_constructor(None,
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SafeConstructor.construct_undefined)
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class Constructor(SafeConstructor):
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def construct_python_str(self, node):
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return self.construct_scalar(node).encode('utf-8')
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def construct_python_unicode(self, node):
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return self.construct_scalar(node)
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def construct_python_long(self, node):
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return long(self.construct_yaml_int(node))
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def construct_python_complex(self, node):
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return complex(self.construct_scalar(node))
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def construct_python_tuple(self, node):
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return tuple(self.construct_sequence(node))
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def find_python_module(self, name, mark):
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if not name:
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raise ConstructorError("while constructing a Python module", mark,
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"expected non-empty name appended to the tag", mark)
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try:
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__import__(name)
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except ImportError, exc:
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raise ConstructorError("while constructing a Python module", mark,
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"cannot find module %r (%s)" % (name.encode('utf-8'), exc), mark)
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return sys.modules[name]
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def find_python_name(self, name, mark):
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if not name:
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raise ConstructorError("while constructing a Python object", mark,
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"expected non-empty name appended to the tag", mark)
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if u'.' in name:
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module_name, object_name = name.rsplit('.', 1)
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else:
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module_name = '__builtin__'
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object_name = name
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try:
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__import__(module_name)
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except ImportError, exc:
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raise ConstructorError("while constructing a Python object", mark,
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"cannot find module %r (%s)" % (module_name.encode('utf-8'), exc), mark)
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module = sys.modules[module_name]
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if not hasattr(module, object_name):
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|
raise ConstructorError("while constructing a Python object", mark,
|
|
"cannot find %r in the module %r" % (object_name.encode('utf-8'),
|
|
module.__name__), mark)
|
|
return getattr(module, object_name)
|
|
|
|
def construct_python_name(self, suffix, node):
|
|
value = self.construct_scalar(node)
|
|
if value:
|
|
raise ConstructorError("while constructing a Python name", node.start_mark,
|
|
"expected the empty value, but found %r" % value.encode('utf-8'),
|
|
node.start_mark)
|
|
return self.find_python_name(suffix, node.start_mark)
|
|
|
|
def construct_python_module(self, suffix, node):
|
|
value = self.construct_scalar(node)
|
|
if value:
|
|
raise ConstructorError("while constructing a Python module", node.start_mark,
|
|
"expected the empty value, but found %r" % value.encode('utf-8'),
|
|
node.start_mark)
|
|
return self.find_python_module(suffix, node.start_mark)
|
|
|
|
class classobj: pass
|
|
|
|
def make_python_instance(self, suffix, node,
|
|
args=None, kwds=None, newobj=False):
|
|
if not args:
|
|
args = []
|
|
if not kwds:
|
|
kwds = {}
|
|
cls = self.find_python_name(suffix, node.start_mark)
|
|
if newobj and isinstance(cls, type(self.classobj)) \
|
|
and not args and not kwds:
|
|
instance = self.classobj()
|
|
instance.__class__ = cls
|
|
return instance
|
|
elif newobj and isinstance(cls, type):
|
|
return cls.__new__(cls, *args, **kwds)
|
|
else:
|
|
return cls(*args, **kwds)
|
|
|
|
def set_python_instance_state(self, instance, state):
|
|
if hasattr(instance, '__setstate__'):
|
|
instance.__setstate__(state)
|
|
else:
|
|
slotstate = {}
|
|
if isinstance(state, tuple) and len(state) == 2:
|
|
state, slotstate = state
|
|
if hasattr(instance, '__dict__'):
|
|
instance.__dict__.update(state)
|
|
elif state:
|
|
slotstate.update(state)
|
|
for key, value in slotstate.items():
|
|
setattr(object, key, value)
|
|
|
|
def construct_python_object(self, suffix, node):
|
|
# Format:
|
|
# !!python/object:module.name { ... state ... }
|
|
instance = self.make_python_instance(suffix, node, newobj=True)
|
|
yield instance
|
|
deep = hasattr(instance, '__setstate__')
|
|
state = self.construct_mapping(node, deep=deep)
|
|
self.set_python_instance_state(instance, state)
|
|
|
|
def construct_python_object_apply(self, suffix, node, newobj=False):
|
|
# Format:
|
|
# !!python/object/apply # (or !!python/object/new)
|
|
# args: [ ... arguments ... ]
|
|
# kwds: { ... keywords ... }
|
|
# state: ... state ...
|
|
# listitems: [ ... listitems ... ]
|
|
# dictitems: { ... dictitems ... }
|
|
# or short format:
|
|
# !!python/object/apply [ ... arguments ... ]
|
|
# The difference between !!python/object/apply and !!python/object/new
|
|
# is how an object is created, check make_python_instance for details.
|
|
if isinstance(node, SequenceNode):
|
|
args = self.construct_sequence(node, deep=True)
|
|
kwds = {}
|
|
state = {}
|
|
listitems = []
|
|
dictitems = {}
|
|
else:
|
|
value = self.construct_mapping(node, deep=True)
|
|
args = value.get('args', [])
|
|
kwds = value.get('kwds', {})
|
|
state = value.get('state', {})
|
|
listitems = value.get('listitems', [])
|
|
dictitems = value.get('dictitems', {})
|
|
instance = self.make_python_instance(suffix, node, args, kwds, newobj)
|
|
if state:
|
|
self.set_python_instance_state(instance, state)
|
|
if listitems:
|
|
instance.extend(listitems)
|
|
if dictitems:
|
|
for key in dictitems:
|
|
instance[key] = dictitems[key]
|
|
return instance
|
|
|
|
def construct_python_object_new(self, suffix, node):
|
|
return self.construct_python_object_apply(suffix, node, newobj=True)
|
|
|
|
Constructor.add_constructor(
|
|
u'tag:yaml.org,2002:python/none',
|
|
Constructor.construct_yaml_null)
|
|
|
|
Constructor.add_constructor(
|
|
u'tag:yaml.org,2002:python/bool',
|
|
Constructor.construct_yaml_bool)
|
|
|
|
Constructor.add_constructor(
|
|
u'tag:yaml.org,2002:python/str',
|
|
Constructor.construct_python_str)
|
|
|
|
Constructor.add_constructor(
|
|
u'tag:yaml.org,2002:python/unicode',
|
|
Constructor.construct_python_unicode)
|
|
|
|
Constructor.add_constructor(
|
|
u'tag:yaml.org,2002:python/int',
|
|
Constructor.construct_yaml_int)
|
|
|
|
Constructor.add_constructor(
|
|
u'tag:yaml.org,2002:python/long',
|
|
Constructor.construct_python_long)
|
|
|
|
Constructor.add_constructor(
|
|
u'tag:yaml.org,2002:python/float',
|
|
Constructor.construct_yaml_float)
|
|
|
|
Constructor.add_constructor(
|
|
u'tag:yaml.org,2002:python/complex',
|
|
Constructor.construct_python_complex)
|
|
|
|
Constructor.add_constructor(
|
|
u'tag:yaml.org,2002:python/list',
|
|
Constructor.construct_yaml_seq)
|
|
|
|
Constructor.add_constructor(
|
|
u'tag:yaml.org,2002:python/tuple',
|
|
Constructor.construct_python_tuple)
|
|
|
|
Constructor.add_constructor(
|
|
u'tag:yaml.org,2002:python/dict',
|
|
Constructor.construct_yaml_map)
|
|
|
|
Constructor.add_multi_constructor(
|
|
u'tag:yaml.org,2002:python/name:',
|
|
Constructor.construct_python_name)
|
|
|
|
Constructor.add_multi_constructor(
|
|
u'tag:yaml.org,2002:python/module:',
|
|
Constructor.construct_python_module)
|
|
|
|
Constructor.add_multi_constructor(
|
|
u'tag:yaml.org,2002:python/object:',
|
|
Constructor.construct_python_object)
|
|
|
|
Constructor.add_multi_constructor(
|
|
u'tag:yaml.org,2002:python/object/apply:',
|
|
Constructor.construct_python_object_apply)
|
|
|
|
Constructor.add_multi_constructor(
|
|
u'tag:yaml.org,2002:python/object/new:',
|
|
Constructor.construct_python_object_new)
|
|
|