Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/rdflib/plugins/parsers/trig.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 from rdflib import ConjunctiveGraph
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2 from rdflib.parser import Parser
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3 from .notation3 import SinkParser, RDFSink
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4
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5
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6 def becauseSubGraph(*args, **kwargs): pass
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7
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8
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9 class TrigSinkParser(SinkParser):
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10
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11 def directiveOrStatement(self, argstr, h):
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12
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13 #import pdb; pdb.set_trace()
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14
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15 i = self.skipSpace(argstr, h)
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16 if i < 0:
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17 return i # EOF
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18
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19 j = self.graph(argstr, i)
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20 if j >= 0:
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21 return j
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22
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23 j = self.sparqlDirective(argstr, i)
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24 if j >= 0:
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25 return j
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26
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27 j = self.directive(argstr, i)
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28 if j >= 0:
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29 return self.checkDot(argstr, j)
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30
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31 j = self.statement(argstr, i)
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32 if j >= 0:
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33 return self.checkDot(argstr, j)
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34
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35
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36 return j
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37
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38 def labelOrSubject(self, argstr, i, res):
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39 j = self.skipSpace(argstr, i)
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40 if j < 0:
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41 return j # eof
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42 i = j
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43
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44 j = self.uri_ref2(argstr, i, res)
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45 if j >= 0:
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46 return j
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47
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48 if argstr[i] == '[':
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49 j = self.skipSpace(argstr, i+1)
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50 if j < 0:
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51 self.BadSyntax(argstr, i,
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52 "Expected ] got EOF")
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53 if argstr[j] == ']':
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54 res.append(self.blankNode())
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55 return j+1
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56 return -1
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57
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58 def graph(self, argstr, i):
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59 """
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60 Parse trig graph, i.e.
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61
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62 <urn:graphname> = { .. triples .. }
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63
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64 return -1 if it doesn't look like a graph-decl
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65 raise Exception if it looks like a graph, but isn't.
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66 """
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67
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68 #import pdb; pdb.set_trace()
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69 j = self.sparqlTok('GRAPH', argstr, i) # optional GRAPH keyword
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70 if j >= 0: i = j
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71
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72 r = []
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73 j = self.labelOrSubject(argstr, i, r)
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74 if j >= 0:
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75 graph = r[0]
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76 i = j
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77 else:
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78 graph = self._store.graph.identifier # hack
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79
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80
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81 j = self.skipSpace(argstr, i)
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82 if j < 0:
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83 self.BadSyntax(argstr, i,
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84 "EOF found when expected graph")
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85
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86 if argstr[j:j + 1] == "=": # optional = for legacy support
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87
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88 i = self.skipSpace(argstr, j + 1)
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89 if i < 0:
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90 self.BadSyntax(argstr, i, "EOF found when expecting '{'")
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91 else:
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92 i = j
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93
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94 if argstr[i:i+1] != "{":
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95 return -1 # the node wasn't part of a graph
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96
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97
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98 j = i+1
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99
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100 oldParentContext = self._parentContext
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101 self._parentContext = self._context
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102 reason2 = self._reason2
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103 self._reason2 = becauseSubGraph
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104 self._context = self._store.newGraph(graph)
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105
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106 while 1:
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107 i = self.skipSpace(argstr, j)
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108 if i < 0:
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109 self.BadSyntax(
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110 argstr, i, "needed '}', found end.")
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111
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112 if argstr[i:i + 1] == "}":
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113 j = i + 1
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114 break
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115
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116 j = self.directiveOrStatement(argstr, i)
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117 if j < 0:
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118 self.BadSyntax(
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119 argstr, i, "expected statement or '}'")
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120
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121 self._context = self._parentContext
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122 self._reason2 = reason2
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123 self._parentContext = oldParentContext
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124 #res.append(subj.close()) # No use until closed
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125 return j
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126
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127
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128
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129
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130 class TrigParser(Parser):
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131 """
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132 An RDFLib parser for TriG
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133
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134 """
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135
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136 def __init__(self):
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137 pass
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138
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139 def parse(self, source, graph, encoding="utf-8"):
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140
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141 if encoding not in [None, "utf-8"]:
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142 raise Exception(
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143 ("TriG files are always utf-8 encoded, ",
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144 "I was passed: %s") % encoding)
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145
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146 # we're currently being handed a Graph, not a ConjunctiveGraph
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147 assert graph.store.context_aware, "TriG Parser needs a context-aware store!"
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148
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149 conj_graph = ConjunctiveGraph(store=graph.store, identifier=graph.identifier)
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150 conj_graph.default_context = graph # TODO: CG __init__ should have a
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151 # default_context arg
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152 # TODO: update N3Processor so that it can use conj_graph as the sink
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153 conj_graph.namespace_manager = graph.namespace_manager
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154
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155 sink = RDFSink(conj_graph)
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156
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157 baseURI = conj_graph.absolutize(
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158 source.getPublicId() or source.getSystemId() or "")
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159 p = TrigSinkParser(sink, baseURI=baseURI, turtle=True)
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160
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161 p.loadStream(source.getByteStream())
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162
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163 for prefix, namespace in list(p._bindings.items()):
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164 conj_graph.bind(prefix, namespace)
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165
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166 # return ???