1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
# -*- coding: utf-8 -*-
"""YAML loaders and dumpers for PyYAML allowing to keep keys order."""
import sys
import yaml
if float('%d.%d' % sys.version_info[:2]) < 2.7:
from ordereddict import OrderedDict
else:
from collections import OrderedDict
#
## Loaders
#
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:
msg = 'expected a mapping node, but found %s' % node.id
raise yaml.constructor.ConstructError(None,
None,
msg,
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 as err:
raise yaml.constructor.ConstructError(
'while constructing a mapping', node.start_mark,
'found unacceptable key (%s)' % err, key_node.start_mark)
value = self.construct_object(value_node, deep=deep)
mapping[key] = value
return mapping
class Loader(yaml.Loader):
def __init__(self, *args, **kwargs):
yaml.Loader.__init__(self, *args, **kwargs)
self.add_constructor(
'tag:yaml.org,2002:map', type(self).construct_yaml_map)
self.add_constructor(
'tag:yaml.org,2002:omap', type(self).construct_yaml_map)
construct_yaml_map = construct_yaml_map
construct_mapping = construct_mapping
class SafeLoader(yaml.SafeLoader):
def __init__(self, *args, **kwargs):
yaml.SafeLoader.__init__(self, *args, **kwargs)
self.add_constructor(
'tag:yaml.org,2002:map', type(self).construct_yaml_map)
self.add_constructor(
'tag:yaml.org,2002:omap', type(self).construct_yaml_map)
construct_yaml_map = construct_yaml_map
construct_mapping = construct_mapping
#
## Dumpers
#
def represent_ordereddict(self, data):
return self.represent_mapping('tag:yaml.org,2002:map', data.items())
class Dumper(yaml.Dumper):
def __init__(self, *args, **kwargs):
yaml.Dumper.__init__(self, *args, **kwargs)
self.add_representer(OrderedDict, type(self).represent_ordereddict)
represent_ordereddict = represent_ordereddict
class SafeDumper(yaml.SafeDumper):
def __init__(self, *args, **kwargs):
yaml.SafeDumper.__init__(self, *args, **kwargs)
self.add_representer(OrderedDict, type(self).represent_ordereddict)
represent_ordereddict = represent_ordereddict
|
