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annotate planemo/lib/python3.7/site-packages/rdflib/plugins/serializers/nt.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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2 N-Triples RDF graph serializer for RDFLib.
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3 See <http://www.w3.org/TR/rdf-testcases/#ntriples> for details about the
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4 format.
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5 """
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6 from rdflib.term import Literal
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7 from rdflib.serializer import Serializer
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8 from rdflib.py3compat import b
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9
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10 import warnings
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11 import codecs
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12
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13 __all__ = ['NTSerializer']
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14
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15
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16 class NTSerializer(Serializer):
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17 """
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18 Serializes RDF graphs to NTriples format.
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19 """
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20
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21 def __init__(self, store):
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22 Serializer.__init__(self, store)
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23 self.encoding = 'ascii' # n-triples are ascii encoded
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24
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25 def serialize(self, stream, base=None, encoding=None, **args):
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26 if base is not None:
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27 warnings.warn("NTSerializer does not support base.")
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28 if encoding is not None:
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29 warnings.warn("NTSerializer does not use custom encoding.")
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30 encoding = self.encoding
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31 for triple in self.store:
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32 stream.write(_nt_row(triple).encode(self.encoding, "_rdflib_nt_escape"))
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33 stream.write(b("\n"))
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34
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35
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36 class NT11Serializer(NTSerializer):
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37 """
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38 Serializes RDF graphs to RDF 1.1 NTriples format.
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39
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40 Exactly like nt - only utf8 encoded.
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41 """
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42
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43 def __init__(self, store):
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44 Serializer.__init__(self, store) # default to utf-8
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45
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46
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47 def _nt_row(triple):
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48 if isinstance(triple[2], Literal):
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49 return "%s %s %s .\n" % (
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50 triple[0].n3(),
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51 triple[1].n3(),
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52 _quoteLiteral(triple[2]))
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53 else:
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54 return "%s %s %s .\n" % (triple[0].n3(),
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55 triple[1].n3(),
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56 triple[2].n3())
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57
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58
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59 def _quoteLiteral(l):
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60 '''
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61 a simpler version of term.Literal.n3()
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62 '''
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63
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64 encoded = _quote_encode(l)
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65
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66 if l.language:
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67 if l.datatype:
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68 raise Exception("Literal has datatype AND language!")
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69 return '%s@%s' % (encoded, l.language)
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70 elif l.datatype:
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71 return '%s^^<%s>' % (encoded, l.datatype)
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72 else:
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73 return '%s' % encoded
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74
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75
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76 def _quote_encode(l):
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77 return '"%s"' % l.replace('\\', '\\\\')\
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78 .replace('\n', '\\n')\
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79 .replace('"', '\\"')\
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80 .replace('\r', '\\r')
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81
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82 def _nt_unicode_error_resolver(err):
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83
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84 """
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85 Do unicode char replaces as defined in https://www.w3.org/TR/2004/REC-rdf-testcases-20040210/#ntrip_strings
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86 """
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87
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88 def _replace_single(c):
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89 c = ord(c)
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90 fmt = '\\u%04X' if c <= 0xFFFF else '\\U%08X'
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91 return fmt % c
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92
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93 string = err.object[err.start:err.end]
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94 return ( "".join( _replace_single(c) for c in string ), err.end )
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95
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96 codecs.register_error('_rdflib_nt_escape', _nt_unicode_error_resolver)