Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/yaml/composer.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__ = ['Composer', 'ComposerError']
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3
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4 from error import MarkedYAMLError
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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 ComposerError(MarkedYAMLError):
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9 pass
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10
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11 class Composer(object):
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12
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13 def __init__(self):
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14 self.anchors = {}
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15
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16 def check_node(self):
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17 # Drop the STREAM-START event.
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18 if self.check_event(StreamStartEvent):
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19 self.get_event()
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20
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21 # If there are more documents available?
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22 return not self.check_event(StreamEndEvent)
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23
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24 def get_node(self):
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25 # Get the root node of the next document.
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26 if not self.check_event(StreamEndEvent):
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27 return self.compose_document()
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28
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29 def get_single_node(self):
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30 # Drop the STREAM-START event.
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31 self.get_event()
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32
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33 # Compose a document if the stream is not empty.
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34 document = None
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35 if not self.check_event(StreamEndEvent):
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36 document = self.compose_document()
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37
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38 # Ensure that the stream contains no more documents.
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39 if not self.check_event(StreamEndEvent):
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40 event = self.get_event()
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41 raise ComposerError("expected a single document in the stream",
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42 document.start_mark, "but found another document",
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43 event.start_mark)
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44
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45 # Drop the STREAM-END event.
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46 self.get_event()
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47
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48 return document
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49
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50 def compose_document(self):
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51 # Drop the DOCUMENT-START event.
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52 self.get_event()
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53
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54 # Compose the root node.
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55 node = self.compose_node(None, None)
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56
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57 # Drop the DOCUMENT-END event.
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58 self.get_event()
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59
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60 self.anchors = {}
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61 return node
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62
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63 def compose_node(self, parent, index):
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64 if self.check_event(AliasEvent):
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65 event = self.get_event()
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66 anchor = event.anchor
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67 if anchor not in self.anchors:
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68 raise ComposerError(None, None, "found undefined alias %r"
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69 % anchor.encode('utf-8'), event.start_mark)
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70 return self.anchors[anchor]
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71 event = self.peek_event()
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72 anchor = event.anchor
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73 if anchor is not None:
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74 if anchor in self.anchors:
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75 raise ComposerError("found duplicate anchor %r; first occurence"
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76 % anchor.encode('utf-8'), self.anchors[anchor].start_mark,
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77 "second occurence", event.start_mark)
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78 self.descend_resolver(parent, index)
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79 if self.check_event(ScalarEvent):
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80 node = self.compose_scalar_node(anchor)
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81 elif self.check_event(SequenceStartEvent):
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82 node = self.compose_sequence_node(anchor)
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83 elif self.check_event(MappingStartEvent):
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84 node = self.compose_mapping_node(anchor)
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85 self.ascend_resolver()
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86 return node
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87
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88 def compose_scalar_node(self, anchor):
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89 event = self.get_event()
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90 tag = event.tag
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91 if tag is None or tag == u'!':
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92 tag = self.resolve(ScalarNode, event.value, event.implicit)
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93 node = ScalarNode(tag, event.value,
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94 event.start_mark, event.end_mark, style=event.style)
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95 if anchor is not None:
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96 self.anchors[anchor] = node
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97 return node
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98
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99 def compose_sequence_node(self, anchor):
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100 start_event = self.get_event()
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101 tag = start_event.tag
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102 if tag is None or tag == u'!':
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103 tag = self.resolve(SequenceNode, None, start_event.implicit)
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104 node = SequenceNode(tag, [],
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105 start_event.start_mark, None,
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106 flow_style=start_event.flow_style)
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107 if anchor is not None:
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108 self.anchors[anchor] = node
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109 index = 0
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110 while not self.check_event(SequenceEndEvent):
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111 node.value.append(self.compose_node(node, index))
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112 index += 1
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113 end_event = self.get_event()
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114 node.end_mark = end_event.end_mark
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115 return node
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116
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117 def compose_mapping_node(self, anchor):
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118 start_event = self.get_event()
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119 tag = start_event.tag
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120 if tag is None or tag == u'!':
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121 tag = self.resolve(MappingNode, None, start_event.implicit)
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122 node = MappingNode(tag, [],
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123 start_event.start_mark, None,
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124 flow_style=start_event.flow_style)
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125 if anchor is not None:
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126 self.anchors[anchor] = node
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127 while not self.check_event(MappingEndEvent):
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128 #key_event = self.peek_event()
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129 item_key = self.compose_node(node, None)
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130 #if item_key in node.value:
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131 # raise ComposerError("while composing a mapping", start_event.start_mark,
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132 # "found duplicate key", key_event.start_mark)
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133 item_value = self.compose_node(node, item_key)
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134 #node.value[item_key] = item_value
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135 node.value.append((item_key, item_value))
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136 end_event = self.get_event()
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137 node.end_mark = end_event.end_mark
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138 return node
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139