Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/rdflib/plugins/parsers/trix.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 A TriX parser for RDFLib
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3 """
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4 from rdflib.namespace import Namespace
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5 from rdflib.term import URIRef
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6 from rdflib.term import BNode
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7 from rdflib.term import Literal
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8 from rdflib.graph import Graph, ConjunctiveGraph
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9 from rdflib.exceptions import ParserError
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10 from rdflib.parser import Parser
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11
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12 from xml.sax.saxutils import handler
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13 from xml.sax import make_parser
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14 from xml.sax.handler import ErrorHandler
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15
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16 __all__ = ['create_parser', 'TriXHandler', 'TriXParser']
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17
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18
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19 TRIXNS = Namespace("http://www.w3.org/2004/03/trix/trix-1/")
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20 XMLNS = Namespace("http://www.w3.org/XML/1998/namespace")
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21
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22
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23 class TriXHandler(handler.ContentHandler):
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24 """An Sax Handler for TriX. See http://sw.nokia.com/trix/"""
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25
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26 def __init__(self, store):
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27 self.store = store
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28 self.preserve_bnode_ids = False
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29 self.reset()
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30
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31 def reset(self):
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32 self.bnode = {}
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33 self.graph = None
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34 self.triple = None
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35 self.state = 0
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36 self.lang = None
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37 self.datatype = None
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38
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39 # ContentHandler methods
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40
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41 def setDocumentLocator(self, locator):
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42 self.locator = locator
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43
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44 def startDocument(self):
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45 pass
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46
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47 def startPrefixMapping(self, prefix, namespace):
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48 pass
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49
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50 def endPrefixMapping(self, prefix):
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51 pass
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52
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53 def startElementNS(self, name, qname, attrs):
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54
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55 if name[0] != str(TRIXNS):
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56 self.error(
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57 "Only elements in the TriX namespace are allowed. %s!=%s"
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58 % (name[0], TRIXNS))
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59
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60 if name[1] == "TriX":
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61 if self.state == 0:
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62 self.state = 1
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63 else:
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64 self.error("Unexpected TriX element")
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65
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66 elif name[1] == "graph":
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67 if self.state == 1:
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68 self.state = 2
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69 else:
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70 self.error("Unexpected graph element")
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71
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72 elif name[1] == "uri":
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73 if self.state == 2:
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74 # the context uri
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75 self.state = 3
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76 elif self.state == 4:
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77 # part of a triple
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78 pass
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79 else:
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80 self.error("Unexpected uri element")
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81
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82 elif name[1] == "triple":
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83 if self.state == 2:
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84 if self.graph is None:
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85 # anonymous graph, create one with random bnode id
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86 self.graph = Graph(store=self.store)
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87 # start of a triple
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88 self.triple = []
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89 self.state = 4
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90 else:
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91 self.error("Unexpected triple element")
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92
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93 elif name[1] == "typedLiteral":
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94 if self.state == 4:
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95 # part of triple
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96 self.lang = None
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97 self.datatype = None
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98
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99 try:
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100 self.lang = attrs.getValue((str(XMLNS), "lang"))
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101 except:
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102 # language not required - ignore
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103 pass
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104 try:
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105 self.datatype = attrs.getValueByQName("datatype")
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106 except KeyError:
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107 self.error("No required attribute 'datatype'")
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108 else:
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109 self.error("Unexpected typedLiteral element")
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110
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111 elif name[1] == "plainLiteral":
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112 if self.state == 4:
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113 # part of triple
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114 self.lang = None
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115 self.datatype = None
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116 try:
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117 self.lang = attrs.getValue((str(XMLNS), "lang"))
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118 except:
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119 # language not required - ignore
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120 pass
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121
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122 else:
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123 self.error("Unexpected plainLiteral element")
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124
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125 elif name[1] == "id":
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126 if self.state == 2:
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127 # the context uri
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128 self.state = 3
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129
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130 elif self.state == 4:
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131 # part of triple
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132 pass
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133 else:
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134 self.error("Unexpected id element")
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135
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136 else:
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137 self.error("Unknown element %s in TriX namespace" % name[1])
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138
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139 self.chars = ""
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140
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141 def endElementNS(self, name, qname):
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142 if name[0] != str(TRIXNS):
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143 self.error(
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144 "Only elements in the TriX namespace are allowed. %s!=%s"
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145 % (name[0], TRIXNS))
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146
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147 if name[1] == "uri":
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148 if self.state == 3:
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149 self.graph = Graph(store=self.store,
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150 identifier=URIRef(self.chars.strip()))
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151 self.state = 2
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152 elif self.state == 4:
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153 self.triple += [URIRef(self.chars.strip())]
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154 else:
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155 self.error(
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156 "Illegal internal self.state - This should never " +
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157 "happen if the SAX parser ensures XML syntax correctness")
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158
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159 elif name[1] == "id":
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160 if self.state == 3:
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161 self.graph = Graph(self.store, identifier=self.get_bnode(
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162 self.chars.strip()))
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163 self.state = 2
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164 elif self.state == 4:
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165 self.triple += [self.get_bnode(self.chars.strip())]
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166 else:
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167 self.error(
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168 "Illegal internal self.state - This should never " +
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169 "happen if the SAX parser ensures XML syntax correctness")
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170
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171 elif name[1] == "plainLiteral" or name[1] == "typedLiteral":
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172 if self.state == 4:
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173 self.triple += [Literal(
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174 self.chars, lang=self.lang, datatype=self.datatype)]
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175 else:
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176 self.error(
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177 "This should never happen if the SAX parser " +
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178 "ensures XML syntax correctness")
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179
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180 elif name[1] == "triple":
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181 if self.state == 4:
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182 if len(self.triple) != 3:
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183 self.error("Triple has wrong length, got %d elements: %s" %
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184 (len(self.triple), self.triple))
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185
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186 self.graph.add(self.triple)
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187 # self.store.store.add(self.triple,context=self.graph)
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188 # self.store.addN([self.triple+[self.graph]])
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189 self.state = 2
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190 else:
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191 self.error(
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192 "This should never happen if the SAX parser " +
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193 "ensures XML syntax correctness")
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194
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195 elif name[1] == "graph":
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196 self.graph = None
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197 self.state = 1
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198
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199 elif name[1] == "TriX":
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200 self.state = 0
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201
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202 else:
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203 self.error("Unexpected close element")
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204
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205 def get_bnode(self, label):
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206 if self.preserve_bnode_ids:
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207 bn = BNode(label)
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208 else:
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209 if label in self.bnode:
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210 bn = self.bnode[label]
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211 else:
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212 bn = BNode(label)
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213 self.bnode[label] = bn
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214 return bn
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215
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216 def characters(self, content):
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217 self.chars += content
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218
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219 def ignorableWhitespace(self, content):
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220 pass
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221
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222 def processingInstruction(self, target, data):
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223 pass
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224
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225 def error(self, message):
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226 locator = self.locator
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227 info = "%s:%s:%s: " % (
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228 locator.getSystemId(),
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229 locator.getLineNumber(),
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230 locator.getColumnNumber())
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231 raise ParserError(info + message)
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232
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233
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234 def create_parser(store):
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235 parser = make_parser()
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236 try:
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237 # Workaround for bug in expatreader.py. Needed when
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238 # expatreader is trying to guess a prefix.
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239 parser.start_namespace_decl(
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240 "xml", "http://www.w3.org/XML/1998/namespace")
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241 except AttributeError:
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242 pass # Not present in Jython (at least)
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243 parser.setFeature(handler.feature_namespaces, 1)
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244 trix = TriXHandler(store)
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245 parser.setContentHandler(trix)
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246 parser.setErrorHandler(ErrorHandler())
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247 return parser
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248
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249
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250 class TriXParser(Parser):
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251 """A parser for TriX. See http://sw.nokia.com/trix/"""
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252
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253 def __init__(self):
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254 pass
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255
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256 def parse(self, source, sink, **args):
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257 assert sink.store.context_aware, (
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258 "TriXParser must be given a context aware store.")
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259
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260 self._parser = create_parser(sink.store)
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261 content_handler = self._parser.getContentHandler()
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262 preserve_bnode_ids = args.get("preserve_bnode_ids", None)
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263 if preserve_bnode_ids is not None:
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264 content_handler.preserve_bnode_ids = preserve_bnode_ids
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265 # We're only using it once now
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266 # content_handler.reset()
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267 # self._parser.reset()
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268 self._parser.parse(source)