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annotate planemo/lib/python3.7/site-packages/rdflib/plugins/serializers/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 """
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2 Trig RDF graph serializer for RDFLib.
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3 See <http://www.w3.org/TR/trig/> for syntax specification.
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4 """
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5
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6 from collections import defaultdict
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7
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8 from rdflib.plugins.serializers.turtle import TurtleSerializer, _GEN_QNAME_FOR_DT, VERB
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9
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10 from rdflib.term import BNode, Literal
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11
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12 __all__ = ['TrigSerializer']
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13
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14
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15 class TrigSerializer(TurtleSerializer):
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16
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17 short_name = "trig"
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18 indentString = 4 * ' '
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19
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20 def __init__(self, store):
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21 if store.context_aware:
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22 self.contexts = list(store.contexts())
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23 self.default_context = store.default_context.identifier
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24 if store.default_context:
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25 self.contexts.append(store.default_context)
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26 else:
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27 self.contexts = [store]
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28 self.default_context = None
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29
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30 super(TrigSerializer, self).__init__(store)
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31
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32 def preprocess(self):
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33 for context in self.contexts:
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34 self.store = context
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35 self.getQName(context.identifier)
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36 self._references = defaultdict(int)
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37 self._subjects = {}
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38
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39 for triple in context:
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40 self.preprocessTriple(triple)
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41
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42 self._contexts[context]=(self.orderSubjects(), self._subjects, self._references)
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43
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44 def reset(self):
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45 super(TrigSerializer, self).reset()
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46 self._contexts = {}
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47
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48 def serialize(self, stream, base=None, encoding=None,
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49 spacious=None, **args):
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50 self.reset()
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51 self.stream = stream
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52 self.base = base
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53
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54 if spacious is not None:
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55 self._spacious = spacious
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56
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57 self.preprocess()
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58
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59 self.startDocument()
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60
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61 firstTime = True
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62 for store, (ordered_subjects, subjects, ref) in list(self._contexts.items()):
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63 if not ordered_subjects: continue
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64
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65 self._references = ref
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66 self._serialized = {}
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67 self.store = store
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68 self._subjects = subjects
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69
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70 if self.default_context and store.identifier==self.default_context:
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71 self.write(self.indent() + '\n{')
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72 else:
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73 if isinstance(store.identifier, BNode):
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74 iri = store.identifier.n3()
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75 else:
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76 iri = self.getQName(store.identifier)
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77 if iri is None:
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78 iri = store.identifier.n3()
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79 self.write(self.indent() + '\n%s {' % iri)
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80
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81 self.depth += 1
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82 for subject in ordered_subjects:
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83 if self.isDone(subject):
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84 continue
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85 if firstTime:
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86 firstTime = False
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87 if self.statement(subject) and not firstTime:
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88 self.write('\n')
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89 self.depth -= 1
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90 self.write('}\n')
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91
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92 self.endDocument()
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93 stream.write("\n".encode('ascii'))