Mercurial > repos > shellac > guppy_basecaller
annotate env/lib/python3.7/site-packages/rdflib/plugins/serializers/nquads.py @ 2:6af9afd405e9 draft
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author | shellac |
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date | Thu, 14 May 2020 14:56:58 -0400 |
parents | 26e78fe6e8c4 |
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1 import warnings |
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2 |
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3 from rdflib.term import Literal |
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4 from rdflib.serializer import Serializer |
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5 from rdflib.py3compat import b |
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6 |
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7 from rdflib.plugins.serializers.nt import _quoteLiteral |
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8 |
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9 __all__ = ['NQuadsSerializer'] |
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10 |
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11 |
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12 class NQuadsSerializer(Serializer): |
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13 |
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14 def __init__(self, store): |
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15 if not store.context_aware: |
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16 raise Exception( |
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17 "NQuads serialization only makes " |
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18 "sense for context-aware stores!") |
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19 |
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20 super(NQuadsSerializer, self).__init__(store) |
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21 |
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22 def serialize(self, stream, base=None, encoding=None, **args): |
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23 if base is not None: |
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24 warnings.warn("NQuadsSerializer does not support base.") |
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25 if encoding is not None: |
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26 warnings.warn("NQuadsSerializer does not use custom encoding.") |
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27 encoding = self.encoding |
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28 for context in self.store.contexts(): |
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29 for triple in context: |
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30 stream.write(_nq_row( |
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31 triple, context.identifier).encode(encoding, "replace")) |
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32 stream.write(b("\n")) |
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33 |
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34 |
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35 def _nq_row(triple, context): |
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36 if isinstance(triple[2], Literal): |
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37 return "%s %s %s %s .\n" % (triple[0].n3(), |
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38 triple[1].n3(), |
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39 _quoteLiteral(triple[2]), |
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40 context.n3()) |
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41 else: |
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42 return "%s %s %s %s .\n" % (triple[0].n3(), |
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43 triple[1].n3(), |
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44 triple[2].n3(), |
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45 context.n3()) |