Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/rdflib/collection.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 from __future__ import absolute_import
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2 from __future__ import division
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3 from __future__ import print_function
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4
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5 from rdflib.namespace import RDF
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6 from rdflib.term import BNode
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7 from rdflib.term import Literal
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8
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9
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10 __all__ = ['Collection']
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11
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12
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13 class Collection(object):
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14 __doc__ = """
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15 See "Emulating container types":
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16 https://docs.python.org/reference/datamodel.html#emulating-container-types
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17
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18 >>> from rdflib.graph import Graph
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19 >>> from pprint import pprint
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20 >>> listName = BNode()
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21 >>> g = Graph('IOMemory')
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22 >>> listItem1 = BNode()
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23 >>> listItem2 = BNode()
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24 >>> g.add((listName, RDF.first, Literal(1)))
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25 >>> g.add((listName, RDF.rest, listItem1))
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26 >>> g.add((listItem1, RDF.first, Literal(2)))
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27 >>> g.add((listItem1, RDF.rest, listItem2))
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28 >>> g.add((listItem2, RDF.rest, RDF.nil))
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29 >>> g.add((listItem2, RDF.first, Literal(3)))
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30 >>> c = Collection(g,listName)
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31 >>> pprint([term.n3() for term in c])
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32 [u'"1"^^<http://www.w3.org/2001/XMLSchema#integer>',
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33 u'"2"^^<http://www.w3.org/2001/XMLSchema#integer>',
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34 u'"3"^^<http://www.w3.org/2001/XMLSchema#integer>']
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35
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36 >>> Literal(1) in c
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37 True
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38 >>> len(c)
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39 3
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40 >>> c._get_container(1) == listItem1
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41 True
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42 >>> c.index(Literal(2)) == 1
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43 True
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44 """
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45
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46 def __init__(self, graph, uri, seq=[]):
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47 self.graph = graph
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48 self.uri = uri or BNode()
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49 self += seq
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50
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51 def n3(self):
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52 """
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53 >>> from rdflib.graph import Graph
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54 >>> listName = BNode()
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55 >>> g = Graph('IOMemory')
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56 >>> listItem1 = BNode()
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57 >>> listItem2 = BNode()
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58 >>> g.add((listName, RDF.first, Literal(1)))
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59 >>> g.add((listName, RDF.rest, listItem1))
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60 >>> g.add((listItem1, RDF.first, Literal(2)))
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61 >>> g.add((listItem1, RDF.rest, listItem2))
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62 >>> g.add((listItem2, RDF.rest, RDF.nil))
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63 >>> g.add((listItem2, RDF.first, Literal(3)))
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64 >>> c = Collection(g, listName)
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65 >>> print(c.n3()) #doctest: +NORMALIZE_WHITESPACE
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66 ( "1"^^<http://www.w3.org/2001/XMLSchema#integer>
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67 "2"^^<http://www.w3.org/2001/XMLSchema#integer>
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68 "3"^^<http://www.w3.org/2001/XMLSchema#integer> )
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69 """
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70 return "( %s )" % (' '.join([i.n3() for i in self]))
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71
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72 def _get_container(self, index):
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73 """Gets the first, rest holding node at index."""
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74 assert isinstance(index, int)
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75 graph = self.graph
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76 container = self.uri
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77 i = 0
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78 while i < index:
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79 i += 1
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80 container = graph.value(container, RDF.rest)
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81 if container is None:
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82 break
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83 return container
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84
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85 def __len__(self):
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86 """length of items in collection."""
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87 return len(list(self.graph.items(self.uri)))
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88
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89 def index(self, item):
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90 """
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91 Returns the 0-based numerical index of the item in the list
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92 """
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93 listName = self.uri
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94 index = 0
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95 while True:
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96 if (listName, RDF.first, item) in self.graph:
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97 return index
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98 else:
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99 newLink = list(self.graph.objects(listName, RDF.rest))
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100 index += 1
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101 if newLink == [RDF.nil]:
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102 raise ValueError("%s is not in %s" % (item, self.uri))
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103 elif not newLink:
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104 raise Exception("Malformed RDF Collection: %s" % self.uri)
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105 else:
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106 assert len(newLink) == 1, \
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107 "Malformed RDF Collection: %s" % self.uri
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108 listName = newLink[0]
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109
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110 def __getitem__(self, key):
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111 """TODO"""
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112 c = self._get_container(key)
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113 if c:
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114 v = self.graph.value(c, RDF.first)
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115 if v:
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116 return v
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117 else:
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118 raise KeyError(key)
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119 else:
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120 raise IndexError(key)
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121
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122 def __setitem__(self, key, value):
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123 """TODO"""
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124 c = self._get_container(key)
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125 if c:
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126 self.graph.set((c, RDF.first, value))
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127 else:
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128 raise IndexError(key)
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129
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130 def __delitem__(self, key):
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131 """
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132 >>> from rdflib.namespace import RDF, RDFS
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133 >>> from rdflib import Graph
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134 >>> from pprint import pformat
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135 >>> g = Graph()
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136 >>> a = BNode('foo')
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137 >>> b = BNode('bar')
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138 >>> c = BNode('baz')
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139 >>> g.add((a, RDF.first, RDF.type))
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140 >>> g.add((a, RDF.rest, b))
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141 >>> g.add((b, RDF.first, RDFS.label))
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142 >>> g.add((b, RDF.rest, c))
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143 >>> g.add((c, RDF.first, RDFS.comment))
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144 >>> g.add((c, RDF.rest, RDF.nil))
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145 >>> len(g)
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146 6
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147 >>> def listAncestry(node, graph):
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148 ... for i in graph.subjects(RDF.rest, node):
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149 ... yield i
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150 >>> [str(node.n3())
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151 ... for node in g.transitiveClosure(listAncestry, RDF.nil)]
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152 ['_:baz', '_:bar', '_:foo']
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153 >>> lst = Collection(g, a)
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154 >>> len(lst)
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155 3
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156 >>> b == lst._get_container(1)
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157 True
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158 >>> c == lst._get_container(2)
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159 True
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160 >>> del lst[1]
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161 >>> len(lst)
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162 2
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163 >>> len(g)
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164 4
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165
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166 """
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167 self[key] # to raise any potential key exceptions
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168 graph = self.graph
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169 current = self._get_container(key)
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170 assert current
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171 if len(self) == 1 and key > 0:
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172 pass
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173 elif key == len(self) - 1:
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174 # the tail
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175 priorLink = self._get_container(key - 1)
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176 self.graph.set((priorLink, RDF.rest, RDF.nil))
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177 graph.remove((current, None, None))
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178 else:
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179 next = self._get_container(key + 1)
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180 prior = self._get_container(key - 1)
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181 assert next and prior
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182 graph.remove((current, None, None))
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183 graph.set((prior, RDF.rest, next))
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184
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185 def __iter__(self):
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186 """Iterator over items in Collections"""
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187 return self.graph.items(self.uri)
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188
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189 def _end(self):
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190 # find end of list
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191 container = self.uri
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192 while True:
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193 rest = self.graph.value(container, RDF.rest)
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194 if rest is None or rest == RDF.nil:
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195 return container
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196 else:
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197 container = rest
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198
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199 def append(self, item):
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200 """
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201 >>> from rdflib.graph import Graph
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202 >>> listName = BNode()
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203 >>> g = Graph()
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204 >>> c = Collection(g,listName,[Literal(1),Literal(2)])
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205 >>> links = [
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206 ... list(g.subjects(object=i, predicate=RDF.first))[0] for i in c]
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207 >>> len([i for i in links if (i, RDF.rest, RDF.nil) in g])
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208 1
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209
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210 """
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211
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212 end = self._end()
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213 if (end, RDF.first, None) in self.graph:
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214 # append new node to the end of the linked list
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215 node = BNode()
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216 self.graph.set((end, RDF.rest, node))
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217 end = node
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218
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219 self.graph.add((end, RDF.first, item))
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220 self.graph.add((end, RDF.rest, RDF.nil))
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221
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222 def __iadd__(self, other):
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223
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224 end = self._end()
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225 self.graph.remove((end, RDF.rest, None))
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226
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227 for item in other:
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228 if (end, RDF.first, None) in self.graph:
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229 nxt = BNode()
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230 self.graph.add((end, RDF.rest, nxt))
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231 end = nxt
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232
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233 self.graph.add((end, RDF.first, item))
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234
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235 self.graph.add((end, RDF.rest, RDF.nil))
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236
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237 def clear(self):
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238 container = self.uri
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239 graph = self.graph
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240 while container:
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241 rest = graph.value(container, RDF.rest)
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242 graph.remove((container, RDF.first, None))
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243 graph.remove((container, RDF.rest, None))
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244 container = rest
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245
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246
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247 def test():
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248 import doctest
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249 doctest.testmod()
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250
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251
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252 if __name__ == "__main__":
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253 test()
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254
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255 from rdflib import Graph
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256 g = Graph()
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257
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258 c = Collection(g, BNode())
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259
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260 assert len(c) == 0
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261
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262 c = Collection(
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263 g, BNode(), [Literal("1"), Literal("2"), Literal("3"), Literal("4")])
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264
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265 assert len(c) == 4
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266
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267 assert c[1] == Literal("2"), c[1]
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268
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269 del c[1]
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270
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271 assert list(c) == [Literal("1"), Literal("3"), Literal("4")], list(c)
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272
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273 try:
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274 del c[500]
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275 except IndexError as i:
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276 pass
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277
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278 c.append(Literal("5"))
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279
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280 print(list(c))
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281
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282 for i in c:
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283 print(i)
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284
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285 del c[3]
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286
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287 c.clear()
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288
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289 assert len(c) == 0