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annotate env/lib/python3.7/site-packages/rdflib/plugins/parsers/nquads.py @ 2:6af9afd405e9 draft

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"planemo upload commit 0a63dd5f4d38a1f6944587f52a8cd79874177fc1"
author shellac
date Thu, 14 May 2020 14:56:58 -0400
parents 26e78fe6e8c4
children
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1 """
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2 This is a rdflib plugin for parsing NQuad files into Conjunctive
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3 graphs that can be used and queried. The store that backs the graph
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4 *must* be able to handle contexts.
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5
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6 >>> from rdflib import ConjunctiveGraph, URIRef, Namespace
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7 >>> g = ConjunctiveGraph()
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8 >>> data = open("test/nquads.rdflib/example.nquads", "rb")
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9 >>> g.parse(data, format="nquads") # doctest:+ELLIPSIS
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10 <Graph identifier=... (<class 'rdflib.graph.Graph'>)>
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11 >>> assert len(g.store) == 449
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12 >>> # There should be 16 separate contexts
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13 >>> assert len([x for x in g.store.contexts()]) == 16
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14 >>> # is the name of entity E10009 "Arco Publications"?
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15 >>> # (in graph http://bibliographica.org/entity/E10009)
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16 >>> # Looking for:
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17 >>> # <http://bibliographica.org/entity/E10009>
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18 >>> # <http://xmlns.com/foaf/0.1/name>
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19 >>> # "Arco Publications"
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20 >>> # <http://bibliographica.org/entity/E10009>
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21 >>> s = URIRef("http://bibliographica.org/entity/E10009")
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22 >>> FOAF = Namespace("http://xmlns.com/foaf/0.1/")
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23 >>> assert(g.value(s, FOAF.name).eq("Arco Publications"))
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24 """
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25
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26 from codecs import getreader
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27
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28 from rdflib.py3compat import b
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29
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30 from rdflib import ConjunctiveGraph
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31
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32 # Build up from the NTriples parser:
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33 from rdflib.plugins.parsers.ntriples import NTriplesParser
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34 from rdflib.plugins.parsers.ntriples import ParseError
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35 from rdflib.plugins.parsers.ntriples import r_tail
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36 from rdflib.plugins.parsers.ntriples import r_wspace
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37 from rdflib.plugins.parsers.ntriples import r_wspaces
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38
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39 __all__ = ['NQuadsParser']
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40
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41
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42 class NQuadsParser(NTriplesParser):
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43
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44 def parse(self, inputsource, sink, **kwargs):
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45 """Parse f as an N-Triples file."""
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46 assert sink.store.context_aware, ("NQuadsParser must be given"
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47 " a context aware store.")
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48 self.sink = ConjunctiveGraph(store=sink.store, identifier=sink.identifier)
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49
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50 source = inputsource.getByteStream()
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51
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52 if not hasattr(source, 'read'):
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53 raise ParseError("Item to parse must be a file-like object.")
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54
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55 source = getreader('utf-8')(source)
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56
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57 self.file = source
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58 self.buffer = ''
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59 while True:
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60 self.line = __line = self.readline()
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61 if self.line is None:
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62 break
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63 try:
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64 self.parseline()
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65 except ParseError as msg:
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66 raise ParseError("Invalid line (%s):\n%r" % (msg, __line))
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67
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68 return self.sink
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69
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70 def parseline(self):
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71 self.eat(r_wspace)
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72 if (not self.line) or self.line.startswith(('#')):
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73 return # The line is empty or a comment
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74
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75 subject = self.subject()
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76 self.eat(r_wspace)
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77
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78 predicate = self.predicate()
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79 self.eat(r_wspace)
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80
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81 obj = self.object()
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82 self.eat(r_wspace)
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83
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84 context = self.uriref() or self.nodeid() or self.sink.identifier
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85 self.eat(r_tail)
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86
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87 if self.line:
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88 raise ParseError("Trailing garbage")
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89 # Must have a context aware store - add on a normal Graph
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90 # discards anything where the ctx != graph.identifier
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91 self.sink.get_context(context).add((subject, predicate, obj))