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- # -*- coding: utf-8 -*-
- #
- # Copyright (C) 2009-2015 Ben Kurtovic <ben.kurtovic@gmail.com>
- #
- # Permission is hereby granted, free of charge, to any person obtaining a copy
- # of this software and associated documentation files (the "Software"), to deal
- # in the Software without restriction, including without limitation the rights
- # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- # copies of the Software, and to permit persons to whom the Software is
- # furnished to do so, subject to the following conditions:
- #
- # The above copyright notice and this permission notice shall be included in
- # all copies or substantial portions of the Software.
- #
- # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- # SOFTWARE.
-
- """
- Based on:
-
- * https://gist.github.com/844388
- * http://pyyaml.org/attachment/ticket/161/use_ordered_dict.py
-
- with modifications.
- """
-
- from collections import OrderedDict
-
- import yaml
-
- __all__ = ["OrderedLoader", "OrderedDumper"]
-
- class OrderedLoader(yaml.Loader):
- """A YAML loader that loads mappings into ordered dictionaries."""
-
- def __init__(self, *args, **kwargs):
- super(OrderedLoader, self).__init__(*args, **kwargs)
- constructor = type(self).construct_yaml_map
- self.add_constructor(u"tag:yaml.org,2002:map", constructor)
- self.add_constructor(u"tag:yaml.org,2002:omap", constructor)
-
- def construct_yaml_map(self, node):
- data = OrderedDict()
- yield data
- value = self.construct_mapping(node)
- data.update(value)
-
- def construct_mapping(self, node, deep=False):
- if isinstance(node, yaml.MappingNode):
- self.flatten_mapping(node)
- else:
- raise yaml.constructor.ConstructorError(None, None,
- "expected a mapping node, but found {0}".format(node.id),
- node.start_mark)
-
- mapping = OrderedDict()
- for key_node, value_node in node.value:
- key = self.construct_object(key_node, deep=deep)
- try:
- hash(key)
- except TypeError, exc:
- raise yaml.constructor.ConstructorError(
- "while constructing a mapping", node.start_mark,
- "found unacceptable key ({0})".format(exc),
- key_node.start_mark)
- value = self.construct_object(value_node, deep=deep)
- mapping[key] = value
- return mapping
-
-
- class OrderedDumper(yaml.SafeDumper):
- """A YAML dumper that dumps ordered dictionaries into mappings."""
-
- def __init__(self, *args, **kwargs):
- super(OrderedDumper, self).__init__(*args, **kwargs)
- self.add_representer(OrderedDict, type(self).represent_dict)
-
- def represent_mapping(self, tag, mapping, flow_style=None):
- value = []
- node = yaml.MappingNode(tag, value, flow_style=flow_style)
- if self.alias_key is not None:
- self.represented_objects[self.alias_key] = node
- best_style = True
- if hasattr(mapping, "items"):
- mapping = list(mapping.items())
- for item_key, item_value in mapping:
- node_key = self.represent_data(item_key)
- node_value = self.represent_data(item_value)
- if not (isinstance(node_key, yaml.ScalarNode) and not
- node_key.style):
- best_style = False
- if not (isinstance(node_value, yaml.ScalarNode) and not
- node_value.style):
- best_style = False
- value.append((node_key, node_value))
- if flow_style is None:
- if self.default_flow_style is not None:
- node.flow_style = self.default_flow_style
- else:
- node.flow_style = best_style
- return node
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