Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/rdflib/plugins/sparql/results/jsonresults.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.query import (
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2 Result, ResultException, ResultSerializer, ResultParser)
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3 from rdflib import Literal, URIRef, BNode, Variable
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4
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5 from rdflib.py3compat import bytestype
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6
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7
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8 from . import jsonlayer
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9
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10 """A Serializer for SPARQL results in JSON:
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11
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12 http://www.w3.org/TR/rdf-sparql-json-res/
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13
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14 Bits and pieces borrowed from:
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15 http://projects.bigasterisk.com/sparqlhttp/
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16
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17 Authors: Drew Perttula, Gunnar Aastrand Grimnes
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18
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19 """
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20
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21
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22 class JSONResultParser(ResultParser):
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23
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24 def parse(self, source):
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25 inp = source.read()
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26 if isinstance(inp, bytestype):
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27 inp = inp.decode('utf-8')
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28 return JSONResult(jsonlayer.decode(inp))
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29
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30
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31 class JSONResultSerializer(ResultSerializer):
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32
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33 def __init__(self, result):
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34 ResultSerializer.__init__(self, result)
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35
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36 def serialize(self, stream, encoding=None):
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37
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38 res = {}
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39 if self.result.type == 'ASK':
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40 res["head"] = {}
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41 res["boolean"] = self.result.askAnswer
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42 else:
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43 # select
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44 res["results"] = {}
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45 res["head"] = {}
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46 res["head"]["vars"] = self.result.vars
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47 res["results"]["bindings"] = [self._bindingToJSON(
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48 x) for x in self.result.bindings]
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49
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50 r = jsonlayer.encode(res)
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51 if encoding is not None:
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52 stream.write(r.encode(encoding))
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53 else:
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54 stream.write(r)
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55
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56 def _bindingToJSON(self, b):
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57 res = {}
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58 for var in b:
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59 j = termToJSON(self, b[var])
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60 if j is not None:
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61 res[var] = termToJSON(self, b[var])
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62 return res
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63
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64
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65 class JSONResult(Result):
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66
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67 def __init__(self, json):
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68 self.json = json
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69 if "boolean" in json:
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70 type_ = 'ASK'
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71 elif "results" in json:
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72 type_ = 'SELECT'
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73 else:
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74 raise ResultException('No boolean or results in json!')
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75
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76 Result.__init__(self, type_)
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77
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78 if type_ == 'ASK':
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79 self.askAnswer = bool(json['boolean'])
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80 else:
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81 self.bindings = self._get_bindings()
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82 self.vars = [Variable(x) for x in json["head"]["vars"]]
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83
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84 def _get_bindings(self):
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85 ret = []
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86 for row in self.json['results']['bindings']:
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87 outRow = {}
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88 for k, v in list(row.items()):
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89 outRow[Variable(k)] = parseJsonTerm(v)
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90 ret.append(outRow)
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91 return ret
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92
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93
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94 def parseJsonTerm(d):
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95 """rdflib object (Literal, URIRef, BNode) for the given json-format dict.
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96
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97 input is like:
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98 { 'type': 'uri', 'value': 'http://famegame.com/2006/01/username' }
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99 { 'type': 'literal', 'value': 'drewp' }
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100 """
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101
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102 t = d['type']
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103 if t == 'uri':
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104 return URIRef(d['value'])
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105 elif t == 'literal':
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106 if 'xml:lang' in d:
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107 return Literal(d['value'], lang=d['xml:lang'])
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108 return Literal(d['value'])
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109 elif t == 'typed-literal':
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110 return Literal(d['value'], datatype=URIRef(d['datatype']))
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111 elif t == 'bnode':
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112 return BNode(d['value'])
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113 else:
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114 raise NotImplementedError("json term type %r" % t)
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115
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116
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117 def termToJSON(self, term):
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118 if isinstance(term, URIRef):
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119 return {'type': 'uri', 'value': str(term)}
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120 elif isinstance(term, Literal):
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121 if term.datatype is not None:
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122 return {'type': 'typed-literal',
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123 'value': str(term),
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124 'datatype': str(term.datatype)}
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125 else:
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126 r = {'type': 'literal',
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127 'value': str(term)}
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128 if term.language is not None:
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129 r['xml:lang'] = term.language
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130 return r
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131
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132 elif isinstance(term, BNode):
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133 return {'type': 'bnode', 'value': str(term)}
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134 elif term is None:
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135 return None
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136 else:
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137 raise ResultException(
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138 'Unknown term type: %s (%s)' % (term, type(term)))