Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/rdflib/plugins/sparql/results/xmlresults.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 from xml.sax.saxutils import XMLGenerator
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3 from xml.dom import XML_NAMESPACE
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4 from xml.sax.xmlreader import AttributesNSImpl
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5
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6 from rdflib.compat import etree
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7
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8 from rdflib import Literal, URIRef, BNode, Graph, Variable
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9 from rdflib.query import (
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10 Result,
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11 ResultParser,
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12 ResultSerializer,
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13 ResultException
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14 )
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15
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16 SPARQL_XML_NAMESPACE = 'http://www.w3.org/2005/sparql-results#'
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17 RESULTS_NS_ET = '{%s}' % SPARQL_XML_NAMESPACE
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18
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19
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20 """A Parser for SPARQL results in XML:
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21
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22 http://www.w3.org/TR/rdf-sparql-XMLres/
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23
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24 Bits and pieces borrowed from:
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25 http://projects.bigasterisk.com/sparqlhttp/
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26
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27 Authors: Drew Perttula, Gunnar Aastrand Grimnes
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28 """
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29
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30
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31 class XMLResultParser(ResultParser):
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32
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33 def parse(self, source):
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34 return XMLResult(source)
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35
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36
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37 class XMLResult(Result):
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38 def __init__(self, source):
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39
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40 xmlstring = source.read()
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41
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42 if isinstance(xmlstring, str):
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43 xmlstring = xmlstring.encode('utf-8')
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44 try:
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45 tree = etree.fromstring(xmlstring)
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46 except Exception as e:
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47 try:
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48 raise e.__class__("error parsing %r: %s" % (xmlstring, e))
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49 except:
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50 raise e
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51
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52 boolean = tree.find(RESULTS_NS_ET + 'boolean')
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53 results = tree.find(RESULTS_NS_ET + 'results')
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54
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55 if boolean is not None:
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56 type_ = 'ASK'
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57 elif results is not None:
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58 type_ = 'SELECT'
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59 else:
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60 g = Graph()
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61 try:
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62 g.parse(data=xmlstring)
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63 if len(g) == 0:
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64 raise
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65 type_ = 'CONSTRUCT'
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66
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67 except:
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68 raise ResultException(
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69 "No RDF Graph, result-bindings or boolean answer found!")
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70
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71 Result.__init__(self, type_)
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72 if type_ == 'SELECT':
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73 self.bindings = []
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74 for result in results:
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75 r = {}
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76 for binding in result:
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77 r[Variable(binding.get('name'))] = parseTerm(binding[0])
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78 self.bindings.append(r)
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79
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80 self.vars = [Variable(x.get("name"))
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81 for x in tree.findall(
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82 './%shead/%svariable' % (
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83 RESULTS_NS_ET, RESULTS_NS_ET))]
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84
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85 elif type_ == 'ASK':
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86 self.askAnswer = boolean.text.lower().strip() == "true"
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87 elif type_ == 'CONSTRUCT':
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88 self.graph = g
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89
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90
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91 def parseTerm(element):
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92 """rdflib object (Literal, URIRef, BNode) for the given
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93 elementtree element"""
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94 tag, text = element.tag, element.text
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95 if tag == RESULTS_NS_ET + 'literal':
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96 if text is None:
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97 text = ''
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98 datatype = None
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99 lang = None
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100 if element.get('datatype', None):
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101 datatype = URIRef(element.get('datatype'))
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102 elif element.get("{%s}lang" % XML_NAMESPACE, None):
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103 lang = element.get("{%s}lang" % XML_NAMESPACE)
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104
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105 ret = Literal(text, datatype=datatype, lang=lang)
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106
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107 return ret
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108 elif tag == RESULTS_NS_ET + 'uri':
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109 return URIRef(text)
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110 elif tag == RESULTS_NS_ET + 'bnode':
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111 return BNode(text)
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112 else:
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113 raise TypeError("unknown binding type %r" % element)
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114
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115
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116 class XMLResultSerializer(ResultSerializer):
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117
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118 def __init__(self, result):
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119 ResultSerializer.__init__(self, result)
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120
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121 def serialize(self, stream, encoding="utf-8"):
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122
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123 writer = SPARQLXMLWriter(stream, encoding)
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124 if self.result.type == 'ASK':
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125 writer.write_header([])
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126 writer.write_ask(self.result.askAnswer)
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127 else:
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128 writer.write_header(self.result.vars)
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129 writer.write_results_header()
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130 for b in self.result.bindings:
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131 writer.write_start_result()
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132 for key, val in b.items():
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133 writer.write_binding(key, val)
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134
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135 writer.write_end_result()
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136
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137 writer.close()
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138
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139
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140 # TODO: Rewrite with ElementTree?
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141 class SPARQLXMLWriter:
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142 """
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143 Python saxutils-based SPARQL XML Writer
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144 """
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145 def __init__(self, output, encoding='utf-8'):
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146 writer = XMLGenerator(output, encoding)
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147 writer.startDocument()
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148 writer.startPrefixMapping('', SPARQL_XML_NAMESPACE)
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149 writer.startPrefixMapping('xml', XML_NAMESPACE)
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150 writer.startElementNS(
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151 (SPARQL_XML_NAMESPACE, 'sparql'),
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152 'sparql', AttributesNSImpl({}, {}))
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153 self.writer = writer
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154 self._output = output
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155 self._encoding = encoding
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156 self._results = False
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157
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158 def write_header(self, allvarsL):
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159 self.writer.startElementNS(
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160 (SPARQL_XML_NAMESPACE, 'head'),
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161 'head', AttributesNSImpl({}, {}))
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162 for i in range(0, len(allvarsL)):
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163 attr_vals = {
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164 (None, 'name'): str(allvarsL[i]),
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165 }
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166 attr_qnames = {
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167 (None, 'name'): 'name',
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168 }
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169 self.writer.startElementNS(
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170 (SPARQL_XML_NAMESPACE, 'variable'),
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171 'variable', AttributesNSImpl(attr_vals, attr_qnames))
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172 self.writer.endElementNS((SPARQL_XML_NAMESPACE,
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173 'variable'), 'variable')
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174 self.writer.endElementNS((SPARQL_XML_NAMESPACE, 'head'), 'head')
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175
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176 def write_ask(self, val):
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177 self.writer.startElementNS(
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178 (SPARQL_XML_NAMESPACE, 'boolean'),
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179 'boolean', AttributesNSImpl({}, {}))
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180 self.writer.characters(str(val).lower())
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181 self.writer.endElementNS(
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182 (SPARQL_XML_NAMESPACE, 'boolean'), 'boolean')
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183
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184 def write_results_header(self):
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185 self.writer.startElementNS(
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186 (SPARQL_XML_NAMESPACE, 'results'),
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187 'results', AttributesNSImpl({}, {}))
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188 self._results = True
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189
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190 def write_start_result(self):
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191 self.writer.startElementNS(
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192 (SPARQL_XML_NAMESPACE, 'result'),
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193 'result', AttributesNSImpl({}, {}))
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194 self._resultStarted = True
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195
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196 def write_end_result(self):
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197 assert self._resultStarted
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198 self.writer.endElementNS(
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199 (SPARQL_XML_NAMESPACE, 'result'), 'result')
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200 self._resultStarted = False
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201
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202 def write_binding(self, name, val):
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203 assert self._resultStarted
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204
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205 attr_vals = {
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206 (None, 'name'): str(name),
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207 }
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208 attr_qnames = {
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209 (None, 'name'): 'name',
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210 }
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211 self.writer.startElementNS(
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212 (SPARQL_XML_NAMESPACE, 'binding'),
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213 'binding', AttributesNSImpl(attr_vals, attr_qnames))
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214
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215 if isinstance(val, URIRef):
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216 self.writer.startElementNS(
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217 (SPARQL_XML_NAMESPACE, 'uri'),
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218 'uri', AttributesNSImpl({}, {}))
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219 self.writer.characters(val)
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220 self.writer.endElementNS(
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221 (SPARQL_XML_NAMESPACE, 'uri'), 'uri')
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222 elif isinstance(val, BNode):
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223 self.writer.startElementNS(
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224 (SPARQL_XML_NAMESPACE, 'bnode'),
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225 'bnode', AttributesNSImpl({}, {}))
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226 self.writer.characters(val)
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227 self.writer.endElementNS(
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228 (SPARQL_XML_NAMESPACE, 'bnode'), 'bnode')
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229 elif isinstance(val, Literal):
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230 attr_vals = {}
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231 attr_qnames = {}
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232 if val.language:
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233 attr_vals[(XML_NAMESPACE, 'lang')] = val.language
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234 attr_qnames[(XML_NAMESPACE, 'lang')] = "xml:lang"
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235 elif val.datatype:
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236 attr_vals[(None, 'datatype')] = val.datatype
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237 attr_qnames[(None, 'datatype')] = 'datatype'
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238
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239 self.writer.startElementNS(
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240 (SPARQL_XML_NAMESPACE, 'literal'),
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241 'literal', AttributesNSImpl(attr_vals, attr_qnames))
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242 self.writer.characters(val)
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243 self.writer.endElementNS(
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244 (SPARQL_XML_NAMESPACE, 'literal'), 'literal')
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245
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246 else:
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247 raise Exception("Unsupported RDF term: %s" % val)
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248
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249 self.writer.endElementNS(
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250 (SPARQL_XML_NAMESPACE, 'binding'), 'binding')
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251
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252 def close(self):
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253 if self._results:
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254 self.writer.endElementNS(
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255 (SPARQL_XML_NAMESPACE, 'results'), 'results')
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256 self.writer.endElementNS(
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257 (SPARQL_XML_NAMESPACE, 'sparql'), 'sparql')
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258 self.writer.endDocument()