Mercurial > repos > bcclaywell > argo_navis

comparison venv/lib/python2.7/site-packages/yaml/representer.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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-1:000000000000 0:d67268158946
1
2 __all__ = ['BaseRepresenter', 'SafeRepresenter', 'Representer',
3 'RepresenterError']
4
5 from error import *
6 from nodes import *
7
8 import datetime
9
10 import sys, copy_reg, types
11
12 class RepresenterError(YAMLError):
13 pass
14
15 class BaseRepresenter(object):
16
17 yaml_representers = {}
18 yaml_multi_representers = {}
19
20 def __init__(self, default_style=None, default_flow_style=None):
21 self.default_style = default_style
22 self.default_flow_style = default_flow_style
23 self.represented_objects = {}
24 self.object_keeper = []
25 self.alias_key = None
26
27 def represent(self, data):
28 node = self.represent_data(data)
29 self.serialize(node)
30 self.represented_objects = {}
31 self.object_keeper = []
32 self.alias_key = None
33
34 def get_classobj_bases(self, cls):
35 bases = [cls]
36 for base in cls.__bases__:
37 bases.extend(self.get_classobj_bases(base))
38 return bases
39
40 def represent_data(self, data):
41 if self.ignore_aliases(data):
42 self.alias_key = None
43 else:
44 self.alias_key = id(data)
45 if self.alias_key is not None:
46 if self.alias_key in self.represented_objects:
47 node = self.represented_objects[self.alias_key]
48 #if node is None:
49 # raise RepresenterError("recursive objects are not allowed: %r" % data)
50 return node
51 #self.represented_objects[alias_key] = None
52 self.object_keeper.append(data)
53 data_types = type(data).__mro__
54 if type(data) is types.InstanceType:
55 data_types = self.get_classobj_bases(data.__class__)+list(data_types)
56 if data_types[0] in self.yaml_representers:
57 node = self.yaml_representers[data_types[0]](self, data)
58 else:
59 for data_type in data_types:
60 if data_type in self.yaml_multi_representers:
61 node = self.yaml_multi_representers[data_type](self, data)
62 break
63 else:
64 if None in self.yaml_multi_representers:
65 node = self.yaml_multi_representers[None](self, data)
66 elif None in self.yaml_representers:
67 node = self.yaml_representers[None](self, data)
68 else:
69 node = ScalarNode(None, unicode(data))
70 #if alias_key is not None:
71 # self.represented_objects[alias_key] = node
72 return node
73
74 def add_representer(cls, data_type, representer):
75 if not 'yaml_representers' in cls.__dict__:
76 cls.yaml_representers = cls.yaml_representers.copy()
77 cls.yaml_representers[data_type] = representer
78 add_representer = classmethod(add_representer)
79
80 def add_multi_representer(cls, data_type, representer):
81 if not 'yaml_multi_representers' in cls.__dict__:
82 cls.yaml_multi_representers = cls.yaml_multi_representers.copy()
83 cls.yaml_multi_representers[data_type] = representer
84 add_multi_representer = classmethod(add_multi_representer)
85
86 def represent_scalar(self, tag, value, style=None):
87 if style is None:
88 style = self.default_style
89 node = ScalarNode(tag, value, style=style)
90 if self.alias_key is not None:
91 self.represented_objects[self.alias_key] = node
92 return node
93
94 def represent_sequence(self, tag, sequence, flow_style=None):
95 value = []
96 node = SequenceNode(tag, value, flow_style=flow_style)
97 if self.alias_key is not None:
98 self.represented_objects[self.alias_key] = node
99 best_style = True
100 for item in sequence:
101 node_item = self.represent_data(item)
102 if not (isinstance(node_item, ScalarNode) and not node_item.style):
103 best_style = False
104 value.append(node_item)
105 if flow_style is None:
106 if self.default_flow_style is not None:
107 node.flow_style = self.default_flow_style
108 else:
109 node.flow_style = best_style
110 return node
111
112 def represent_mapping(self, tag, mapping, flow_style=None):
113 value = []
114 node = MappingNode(tag, value, flow_style=flow_style)
115 if self.alias_key is not None:
116 self.represented_objects[self.alias_key] = node
117 best_style = True
118 if hasattr(mapping, 'items'):
119 mapping = mapping.items()
120 mapping.sort()
121 for item_key, item_value in mapping:
122 node_key = self.represent_data(item_key)
123 node_value = self.represent_data(item_value)
124 if not (isinstance(node_key, ScalarNode) and not node_key.style):
125 best_style = False
126 if not (isinstance(node_value, ScalarNode) and not node_value.style):
127 best_style = False
128 value.append((node_key, node_value))
129 if flow_style is None:
130 if self.default_flow_style is not None:
131 node.flow_style = self.default_flow_style
132 else:
133 node.flow_style = best_style
134 return node
135
136 def ignore_aliases(self, data):
137 return False
138
139 class SafeRepresenter(BaseRepresenter):
140
141 def ignore_aliases(self, data):
142 if data in [None, ()]:
143 return True
144 if isinstance(data, (str, unicode, bool, int, float)):
145 return True
146
147 def represent_none(self, data):
148 return self.represent_scalar(u'tag:yaml.org,2002:null',
149 u'null')
150
151 def represent_str(self, data):
152 tag = None
153 style = None
154 try:
155 data = unicode(data, 'ascii')
156 tag = u'tag:yaml.org,2002:str'
157 except UnicodeDecodeError:
158 try:
159 data = unicode(data, 'utf-8')
160 tag = u'tag:yaml.org,2002:str'
161 except UnicodeDecodeError:
162 data = data.encode('base64')
163 tag = u'tag:yaml.org,2002:binary'
164 style = '|'
165 return self.represent_scalar(tag, data, style=style)
166
167 def represent_unicode(self, data):
168 return self.represent_scalar(u'tag:yaml.org,2002:str', data)
169
170 def represent_bool(self, data):
171 if data:
172 value = u'true'
173 else:
174 value = u'false'
175 return self.represent_scalar(u'tag:yaml.org,2002:bool', value)
176
177 def represent_int(self, data):
178 return self.represent_scalar(u'tag:yaml.org,2002:int', unicode(data))
179
180 def represent_long(self, data):
181 return self.represent_scalar(u'tag:yaml.org,2002:int', unicode(data))
182
183 inf_value = 1e300
184 while repr(inf_value) != repr(inf_value*inf_value):
185 inf_value *= inf_value
186
187 def represent_float(self, data):
188 if data != data or (data == 0.0 and data == 1.0):
189 value = u'.nan'
190 elif data == self.inf_value:
191 value = u'.inf'
192 elif data == -self.inf_value:
193 value = u'-.inf'
194 else:
195 value = unicode(repr(data)).lower()
196 # Note that in some cases `repr(data)` represents a float number
197 # without the decimal parts. For instance:
198 # >>> repr(1e17)
199 # '1e17'
200 # Unfortunately, this is not a valid float representation according
201 # to the definition of the `!!float` tag. We fix this by adding
202 # '.0' before the 'e' symbol.
203 if u'.' not in value and u'e' in value:
204 value = value.replace(u'e', u'.0e', 1)
205 return self.represent_scalar(u'tag:yaml.org,2002:float', value)
206
207 def represent_list(self, data):
208 #pairs = (len(data) > 0 and isinstance(data, list))
209 #if pairs:
210 # for item in data:
211 # if not isinstance(item, tuple) or len(item) != 2:
212 # pairs = False
213 # break
214 #if not pairs:
215 return self.represent_sequence(u'tag:yaml.org,2002:seq', data)
216 #value = []
217 #for item_key, item_value in data:
218 # value.append(self.represent_mapping(u'tag:yaml.org,2002:map',
219 # [(item_key, item_value)]))
220 #return SequenceNode(u'tag:yaml.org,2002:pairs', value)
221
222 def represent_dict(self, data):
223 return self.represent_mapping(u'tag:yaml.org,2002:map', data)
224
225 def represent_set(self, data):
226 value = {}
227 for key in data:
228 value[key] = None
229 return self.represent_mapping(u'tag:yaml.org,2002:set', value)
230
231 def represent_date(self, data):
232 value = unicode(data.isoformat())
233 return self.represent_scalar(u'tag:yaml.org,2002:timestamp', value)
234
235 def represent_datetime(self, data):
236 value = unicode(data.isoformat(' '))
237 return self.represent_scalar(u'tag:yaml.org,2002:timestamp', value)
238
239 def represent_yaml_object(self, tag, data, cls, flow_style=None):
240 if hasattr(data, '__getstate__'):
241 state = data.__getstate__()
242 else:
243 state = data.__dict__.copy()
244 return self.represent_mapping(tag, state, flow_style=flow_style)
245
246 def represent_undefined(self, data):
247 raise RepresenterError("cannot represent an object: %s" % data)
248
249 SafeRepresenter.add_representer(type(None),
250 SafeRepresenter.represent_none)
251
252 SafeRepresenter.add_representer(str,
253 SafeRepresenter.represent_str)
254
255 SafeRepresenter.add_representer(unicode,
256 SafeRepresenter.represent_unicode)
257
258 SafeRepresenter.add_representer(bool,
259 SafeRepresenter.represent_bool)
260
261 SafeRepresenter.add_representer(int,
262 SafeRepresenter.represent_int)
263
264 SafeRepresenter.add_representer(long,
265 SafeRepresenter.represent_long)
266
267 SafeRepresenter.add_representer(float,
268 SafeRepresenter.represent_float)
269
270 SafeRepresenter.add_representer(list,
271 SafeRepresenter.represent_list)
272
273 SafeRepresenter.add_representer(tuple,
274 SafeRepresenter.represent_list)
275
276 SafeRepresenter.add_representer(dict,
277 SafeRepresenter.represent_dict)
278
279 SafeRepresenter.add_representer(set,
280 SafeRepresenter.represent_set)
281
282 SafeRepresenter.add_representer(datetime.date,
283 SafeRepresenter.represent_date)
284
285 SafeRepresenter.add_representer(datetime.datetime,
286 SafeRepresenter.represent_datetime)
287
288 SafeRepresenter.add_representer(None,
289 SafeRepresenter.represent_undefined)
290
291 class Representer(SafeRepresenter):
292
293 def represent_str(self, data):
294 tag = None
295 style = None
296 try:
297 data = unicode(data, 'ascii')
298 tag = u'tag:yaml.org,2002:str'
299 except UnicodeDecodeError:
300 try:
301 data = unicode(data, 'utf-8')
302 tag = u'tag:yaml.org,2002:python/str'
303 except UnicodeDecodeError:
304 data = data.encode('base64')
305 tag = u'tag:yaml.org,2002:binary'
306 style = '|'
307 return self.represent_scalar(tag, data, style=style)
308
309 def represent_unicode(self, data):
310 tag = None
311 try:
312 data.encode('ascii')
313 tag = u'tag:yaml.org,2002:python/unicode'
314 except UnicodeEncodeError:
315 tag = u'tag:yaml.org,2002:str'
316 return self.represent_scalar(tag, data)
317
318 def represent_long(self, data):
319 tag = u'tag:yaml.org,2002:int'
320 if int(data) is not data:
321 tag = u'tag:yaml.org,2002:python/long'
322 return self.represent_scalar(tag, unicode(data))
323
324 def represent_complex(self, data):
325 if data.imag == 0.0:
326 data = u'%r' % data.real
327 elif data.real == 0.0:
328 data = u'%rj' % data.imag
329 elif data.imag > 0:
330 data = u'%r+%rj' % (data.real, data.imag)
331 else:
332 data = u'%r%rj' % (data.real, data.imag)
333 return self.represent_scalar(u'tag:yaml.org,2002:python/complex', data)
334
335 def represent_tuple(self, data):
336 return self.represent_sequence(u'tag:yaml.org,2002:python/tuple', data)
337
338 def represent_name(self, data):
339 name = u'%s.%s' % (data.__module__, data.__name__)
340 return self.represent_scalar(u'tag:yaml.org,2002:python/name:'+name, u'')
341
342 def represent_module(self, data):
343 return self.represent_scalar(
344 u'tag:yaml.org,2002:python/module:'+data.__name__, u'')
345
346 def represent_instance(self, data):
347 # For instances of classic classes, we use __getinitargs__ and
348 # __getstate__ to serialize the data.
349
350 # If data.__getinitargs__ exists, the object must be reconstructed by
351 # calling cls(**args), where args is a tuple returned by
352 # __getinitargs__. Otherwise, the cls.__init__ method should never be
353 # called and the class instance is created by instantiating a trivial
354 # class and assigning to the instance's __class__ variable.
355
356 # If data.__getstate__ exists, it returns the state of the object.
357 # Otherwise, the state of the object is data.__dict__.
358
359 # We produce either a !!python/object or !!python/object/new node.
360 # If data.__getinitargs__ does not exist and state is a dictionary, we
361 # produce a !!python/object node . Otherwise we produce a
362 # !!python/object/new node.
363
364 cls = data.__class__
365 class_name = u'%s.%s' % (cls.__module__, cls.__name__)
366 args = None
367 state = None
368 if hasattr(data, '__getinitargs__'):
369 args = list(data.__getinitargs__())
370 if hasattr(data, '__getstate__'):
371 state = data.__getstate__()
372 else:
373 state = data.__dict__
374 if args is None and isinstance(state, dict):
375 return self.represent_mapping(
376 u'tag:yaml.org,2002:python/object:'+class_name, state)
377 if isinstance(state, dict) and not state:
378 return self.represent_sequence(
379 u'tag:yaml.org,2002:python/object/new:'+class_name, args)
380 value = {}
381 if args:
382 value['args'] = args
383 value['state'] = state
384 return self.represent_mapping(
385 u'tag:yaml.org,2002:python/object/new:'+class_name, value)
386
387 def represent_object(self, data):
388 # We use __reduce__ API to save the data. data.__reduce__ returns
389 # a tuple of length 2-5:
390 # (function, args, state, listitems, dictitems)
391
392 # For reconstructing, we calls function(*args), then set its state,
393 # listitems, and dictitems if they are not None.
394
395 # A special case is when function.__name__ == '__newobj__'. In this
396 # case we create the object with args[0].__new__(*args).
397
398 # Another special case is when __reduce__ returns a string - we don't
399 # support it.
400
401 # We produce a !!python/object, !!python/object/new or
402 # !!python/object/apply node.
403
404 cls = type(data)
405 if cls in copy_reg.dispatch_table:
406 reduce = copy_reg.dispatch_table[cls](data)
407 elif hasattr(data, '__reduce_ex__'):
408 reduce = data.__reduce_ex__(2)
409 elif hasattr(data, '__reduce__'):
410 reduce = data.__reduce__()
411 else:
412 raise RepresenterError("cannot represent object: %r" % data)
413 reduce = (list(reduce)+[None]*5)[:5]
414 function, args, state, listitems, dictitems = reduce
415 args = list(args)
416 if state is None:
417 state = {}
418 if listitems is not None:
419 listitems = list(listitems)
420 if dictitems is not None:
421 dictitems = dict(dictitems)
422 if function.__name__ == '__newobj__':
423 function = args[0]
424 args = args[1:]
425 tag = u'tag:yaml.org,2002:python/object/new:'
426 newobj = True
427 else:
428 tag = u'tag:yaml.org,2002:python/object/apply:'
429 newobj = False
430 function_name = u'%s.%s' % (function.__module__, function.__name__)
431 if not args and not listitems and not dictitems \
432 and isinstance(state, dict) and newobj:
433 return self.represent_mapping(
434 u'tag:yaml.org,2002:python/object:'+function_name, state)
435 if not listitems and not dictitems \
436 and isinstance(state, dict) and not state:
437 return self.represent_sequence(tag+function_name, args)
438 value = {}
439 if args:
440 value['args'] = args
441 if state or not isinstance(state, dict):
442 value['state'] = state
443 if listitems:
444 value['listitems'] = listitems
445 if dictitems:
446 value['dictitems'] = dictitems
447 return self.represent_mapping(tag+function_name, value)
448
449 Representer.add_representer(str,
450 Representer.represent_str)
451
452 Representer.add_representer(unicode,
453 Representer.represent_unicode)
454
455 Representer.add_representer(long,
456 Representer.represent_long)
457
458 Representer.add_representer(complex,
459 Representer.represent_complex)
460
461 Representer.add_representer(tuple,
462 Representer.represent_tuple)
463
464 Representer.add_representer(type,
465 Representer.represent_name)
466
467 Representer.add_representer(types.ClassType,
468 Representer.represent_name)
469
470 Representer.add_representer(types.FunctionType,
471 Representer.represent_name)
472
473 Representer.add_representer(types.BuiltinFunctionType,
474 Representer.represent_name)
475
476 Representer.add_representer(types.ModuleType,
477 Representer.represent_module)
478
479 Representer.add_multi_representer(types.InstanceType,
480 Representer.represent_instance)
481
482 Representer.add_multi_representer(object,
483 Representer.represent_object)
484