Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/yaml/serializer.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
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2 __all__ = ['Serializer', 'SerializerError']
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3
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4 from error import YAMLError
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5 from events import *
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6 from nodes import *
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7
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8 class SerializerError(YAMLError):
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9 pass
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10
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11 class Serializer(object):
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12
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13 ANCHOR_TEMPLATE = u'id%03d'
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14
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15 def __init__(self, encoding=None,
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16 explicit_start=None, explicit_end=None, version=None, tags=None):
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17 self.use_encoding = encoding
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18 self.use_explicit_start = explicit_start
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19 self.use_explicit_end = explicit_end
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20 self.use_version = version
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21 self.use_tags = tags
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22 self.serialized_nodes = {}
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23 self.anchors = {}
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24 self.last_anchor_id = 0
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25 self.closed = None
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26
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27 def open(self):
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28 if self.closed is None:
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29 self.emit(StreamStartEvent(encoding=self.use_encoding))
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30 self.closed = False
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31 elif self.closed:
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32 raise SerializerError("serializer is closed")
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33 else:
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34 raise SerializerError("serializer is already opened")
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35
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36 def close(self):
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37 if self.closed is None:
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38 raise SerializerError("serializer is not opened")
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39 elif not self.closed:
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40 self.emit(StreamEndEvent())
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41 self.closed = True
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42
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43 #def __del__(self):
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44 # self.close()
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45
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46 def serialize(self, node):
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47 if self.closed is None:
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48 raise SerializerError("serializer is not opened")
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49 elif self.closed:
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50 raise SerializerError("serializer is closed")
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51 self.emit(DocumentStartEvent(explicit=self.use_explicit_start,
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52 version=self.use_version, tags=self.use_tags))
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53 self.anchor_node(node)
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54 self.serialize_node(node, None, None)
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55 self.emit(DocumentEndEvent(explicit=self.use_explicit_end))
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56 self.serialized_nodes = {}
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57 self.anchors = {}
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58 self.last_anchor_id = 0
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59
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60 def anchor_node(self, node):
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61 if node in self.anchors:
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62 if self.anchors[node] is None:
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63 self.anchors[node] = self.generate_anchor(node)
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64 else:
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65 self.anchors[node] = None
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66 if isinstance(node, SequenceNode):
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67 for item in node.value:
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68 self.anchor_node(item)
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69 elif isinstance(node, MappingNode):
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70 for key, value in node.value:
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71 self.anchor_node(key)
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72 self.anchor_node(value)
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73
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74 def generate_anchor(self, node):
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75 self.last_anchor_id += 1
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76 return self.ANCHOR_TEMPLATE % self.last_anchor_id
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77
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78 def serialize_node(self, node, parent, index):
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79 alias = self.anchors[node]
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80 if node in self.serialized_nodes:
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81 self.emit(AliasEvent(alias))
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82 else:
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83 self.serialized_nodes[node] = True
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84 self.descend_resolver(parent, index)
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85 if isinstance(node, ScalarNode):
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86 detected_tag = self.resolve(ScalarNode, node.value, (True, False))
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87 default_tag = self.resolve(ScalarNode, node.value, (False, True))
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88 implicit = (node.tag == detected_tag), (node.tag == default_tag)
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89 self.emit(ScalarEvent(alias, node.tag, implicit, node.value,
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90 style=node.style))
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91 elif isinstance(node, SequenceNode):
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92 implicit = (node.tag
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93 == self.resolve(SequenceNode, node.value, True))
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94 self.emit(SequenceStartEvent(alias, node.tag, implicit,
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95 flow_style=node.flow_style))
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96 index = 0
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97 for item in node.value:
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98 self.serialize_node(item, node, index)
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99 index += 1
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100 self.emit(SequenceEndEvent())
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101 elif isinstance(node, MappingNode):
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102 implicit = (node.tag
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103 == self.resolve(MappingNode, node.value, True))
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104 self.emit(MappingStartEvent(alias, node.tag, implicit,
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105 flow_style=node.flow_style))
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106 for key, value in node.value:
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107 self.serialize_node(key, node, None)
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108 self.serialize_node(value, node, key)
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109 self.emit(MappingEndEvent())
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110 self.ascend_resolver()
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111