82 lines
3.0 KiB
Python
82 lines
3.0 KiB
Python
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import yaml
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from collections import OrderedDict
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def construct_odict(load, node):
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"""This is the same as SafeConstructor.construct_yaml_omap(),
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except the data type is changed to OrderedDict() and setitem is
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used instead of append in the loop.
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>>> yaml.load('''
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... !!omap
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... - foo: bar
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... - mumble: quux
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... - baz: gorp
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... ''')
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OrderedDict([('foo', 'bar'), ('mumble', 'quux'), ('baz', 'gorp')])
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>>> yaml.load('''!!omap [ foo: bar, mumble: quux, baz : gorp ]''')
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OrderedDict([('foo', 'bar'), ('mumble', 'quux'), ('baz', 'gorp')])
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"""
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omap = OrderedDict()
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yield omap
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if not isinstance(node, yaml.SequenceNode):
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raise yaml.constructor.ConstructorError(
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"while constructing an ordered map",
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node.start_mark,
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"expected a sequence, but found %s" % node.id, node.start_mark
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)
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for subnode in node.value:
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if not isinstance(subnode, yaml.MappingNode):
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raise yaml.constructor.ConstructorError(
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"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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)
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if len(subnode.value) != 1:
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raise yaml.constructor.ConstructorError(
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"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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)
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key_node, value_node = subnode.value[0]
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key = load.construct_object(key_node)
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value = load.construct_object(value_node)
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omap[key] = value
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yaml.add_constructor(u'tag:yaml.org,2002:omap', construct_odict)
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def repr_pairs(dump, tag, sequence, flow_style=None):
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"""This is the same code as BaseRepresenter.represent_sequence(),
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but the value passed to dump.represent_data() in the loop is a
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dictionary instead of a tuple."""
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value = []
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node = yaml.SequenceNode(tag, value, flow_style=flow_style)
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if dump.alias_key is not None:
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dump.represented_objects[dump.alias_key] = node
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best_style = True
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for (key, val) in sequence:
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item = dump.represent_data({key: val})
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if not (isinstance(item, yaml.ScalarNode) and not item.style):
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best_style = False
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value.append(item)
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if flow_style is None:
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if dump.default_flow_style is not None:
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node.flow_style = dump.default_flow_style
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else:
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node.flow_style = best_style
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return node
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def repr_odict(dumper, data):
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"""
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>>> data = OrderedDict([('foo', 'bar'), ('mumble', 'quux'), ('baz', 'gorp')])
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>>> yaml.dump(data, default_flow_style=False)
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'!!omap\\n- foo: bar\\n- mumble: quux\\n- baz: gorp\\n'
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>>> yaml.dump(data, default_flow_style=True)
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'!!omap [foo: bar, mumble: quux, baz: gorp]\\n'
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"""
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return repr_pairs(dumper, u'tag:yaml.org,2002:omap', data.iteritems())
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yaml.add_representer(OrderedDict, repr_odict)
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