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annotate planemo/lib/python3.7/site-packages/rdflib/plugins/parsers/pyRdfa/parse.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 # -*- coding: utf-8 -*-
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2 """
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3 The core parsing function of RDFa. Some details are
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4 put into other modules to make it clearer to update/modify (e.g., generation of C{@property} values, or managing the current state).
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5
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6 Note that the entry point (L{parse_one_node}) bifurcates into an RDFa 1.0 and RDFa 1.1 version, ie,
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7 to L{_parse_1_0} and L{_parse_1_1}. Some of the parsing details (management of C{@property}, list facilities, changed behavior on C{@typeof})) have changed
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8 between versions and forcing the two into one function would be counter productive.
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9
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10 @summary: RDFa core parser processing step
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11 @organization: U{World Wide Web Consortium<http://www.w3.org>}
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12 @author: U{Ivan Herman<a href="http://www.w3.org/People/Ivan/">}
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13 @license: This software is available for use under the
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14 U{W3C® SOFTWARE NOTICE AND LICENSE<href="http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231">}
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15 """
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16
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17 """
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18 $Id: parse.py,v 1.19 2013-01-07 12:46:43 ivan Exp $
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19 $Date: 2013-01-07 12:46:43 $
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20 """
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21
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22 import sys
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23
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24 from .state import ExecutionContext
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25 from .property import ProcessProperty
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26 from .embeddedRDF import handle_embeddedRDF
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27 from .host import HostLanguage, host_dom_transforms
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28
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29 import rdflib
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30 from rdflib import URIRef
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31 from rdflib import Literal
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32 from rdflib import BNode
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33 from rdflib import Namespace
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34 if rdflib.__version__ >= "3.0.0" :
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35 from rdflib import Graph
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36 from rdflib import RDF as ns_rdf
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37 from rdflib import RDFS as ns_rdfs
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38 else :
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39 from rdflib.Graph import Graph
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40 from rdflib.RDFS import RDFSNS as ns_rdfs
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41 from rdflib.RDF import RDFNS as ns_rdf
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42
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43 from . import IncorrectBlankNodeUsage, err_no_blank_node
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44 from .utils import has_one_of_attributes
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45
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46 #######################################################################
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47 def parse_one_node(node, graph, parent_object, incoming_state, parent_incomplete_triples) :
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48 """The (recursive) step of handling a single node.
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49
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50 This entry just switches between the RDFa 1.0 and RDFa 1.1 versions for parsing. This method is only invoked once,
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51 actually, from the top level; the recursion then happens in the L{_parse_1_0} and L{_parse_1_1} methods for
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52 RDFa 1.0 and RDFa 1.1, respectively.
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53
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54 @param node: the DOM node to handle
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55 @param graph: the RDF graph
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56 @type graph: RDFLib's Graph object instance
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57 @param parent_object: the parent's object, as an RDFLib URIRef
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58 @param incoming_state: the inherited state (namespaces, lang, etc.)
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59 @type incoming_state: L{state.ExecutionContext}
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60 @param parent_incomplete_triples: list of hanging triples (the missing resource set to None) to be handled (or not)
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61 by the current node.
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62 @return: whether the caller has to complete it's parent's incomplete triples
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63 @rtype: Boolean
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64 """
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65 # Branch according to versions.
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66 if incoming_state.rdfa_version >= "1.1" :
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67 _parse_1_1(node, graph, parent_object, incoming_state, parent_incomplete_triples)
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68 else :
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69 _parse_1_0(node, graph, parent_object, incoming_state, parent_incomplete_triples)
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70
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71 #######################################################################
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72 def _parse_1_1(node, graph, parent_object, incoming_state, parent_incomplete_triples) :
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73 """The (recursive) step of handling a single node. See the
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74 U{RDFa 1.1 Core document<http://www.w3.org/TR/rdfa-core/>} for further details.
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75
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76 This is the RDFa 1.1 version.
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77
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78 @param node: the DOM node to handle
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79 @param graph: the RDF graph
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80 @type graph: RDFLib's Graph object instance
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81 @param parent_object: the parent's object, as an RDFLib URIRef
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82 @param incoming_state: the inherited state (namespaces, lang, etc.)
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83 @type incoming_state: L{state.ExecutionContext}
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84 @param parent_incomplete_triples: list of hanging triples (the missing resource set to None) to be handled (or not)
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85 by the current node.
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86 @return: whether the caller has to complete it's parent's incomplete triples
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87 @rtype: Boolean
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88 """
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89 def header_check(p_obj) :
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90 """Special disposition for the HTML <head> and <body> elements..."""
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91 if state.options.host_language in [ HostLanguage.xhtml, HostLanguage.html5, HostLanguage.xhtml5 ] :
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92 if node.nodeName == "head" or node.nodeName == "body" :
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93 if not has_one_of_attributes(node, "about", "resource", "src", "href") :
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94 return p_obj
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95 else :
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96 return None
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97
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98 def lite_check() :
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99 if state.options.check_lite and state.options.host_language in [ HostLanguage.html5, HostLanguage.xhtml5, HostLanguage.xhtml ] :
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100 if node.tagName == "link" and node.hasAttribute("rel") and state.term_or_curie.CURIE_to_URI(node.getAttribute("rel")) != None :
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101 state.options.add_warning("In RDFa Lite, attribute @rel in <link> is only used in non-RDFa way (consider using @property)", node=node)
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102
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103 # Update the state. This means, for example, the possible local settings of
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104 # namespaces and lang
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105 state = None
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106 state = ExecutionContext(node, graph, inherited_state=incoming_state)
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107
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108 #---------------------------------------------------------------------------------
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109 # Extra warning check on RDFa Lite
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110 lite_check()
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111
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112 #---------------------------------------------------------------------------------
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113 # Handling the role attribute is pretty much orthogonal to everything else...
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114 handle_role_attribute(node, graph, state)
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115
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116 #---------------------------------------------------------------------------------
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117 # Handle the special case for embedded RDF, eg, in SVG1.2.
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118 # This may add some triples to the target graph that does not originate from RDFa parsing
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119 # If the function return TRUE, that means that an rdf:RDF has been found. No
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120 # RDFa parsing should be done on that subtree, so we simply return...
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121 if state.options.embedded_rdf and node.nodeType == node.ELEMENT_NODE and handle_embeddedRDF(node, graph, state) :
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122 return
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123
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124 #---------------------------------------------------------------------------------
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125 # calling the host language specific massaging of the DOM
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126 if state.options.host_language in host_dom_transforms and node.nodeType == node.ELEMENT_NODE :
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127 for func in host_dom_transforms[state.options.host_language] : func(node, state)
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128
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129 #---------------------------------------------------------------------------------
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130 # First, let us check whether there is anything to do at all. Ie,
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131 # whether there is any relevant RDFa specific attribute on the element
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132 #
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133 if not has_one_of_attributes(node, "href", "resource", "about", "property", "rel", "rev", "typeof", "src", "vocab", "prefix") :
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134 # nop, there is nothing to do here, just go down the tree and return...
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135 for n in node.childNodes :
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136 if n.nodeType == node.ELEMENT_NODE : parse_one_node(n, graph, parent_object, state, parent_incomplete_triples)
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137 return
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138
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139 #-----------------------------------------------------------------
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140 # The goal is to establish the subject and object for local processing
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141 # The behaviour is slightly different depending on the presense or not
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142 # of the @rel/@rev attributes
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143 current_subject = None
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144 current_object = None
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145 typed_resource = None
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146
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147 if has_one_of_attributes(node, "rel", "rev") :
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148 # in this case there is the notion of 'left' and 'right' of @rel/@rev
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149 # in establishing the new Subject and the objectResource
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150 current_subject = header_check(parent_object)
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151
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152 # set first the subject
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153 if node.hasAttribute("about") :
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154 current_subject = state.getURI("about")
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155 if node.hasAttribute("typeof") : typed_resource = current_subject
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156
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157 # get_URI may return None in case of an illegal CURIE, so
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158 # we have to be careful here, not use only an 'else'
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159 if current_subject == None :
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160 current_subject = parent_object
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161 else :
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162 state.reset_list_mapping(origin = current_subject)
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163
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164 # set the object resource
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165 current_object = state.getResource("resource", "href", "src")
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166
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167 if node.hasAttribute("typeof") and not node.hasAttribute("about") :
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168 if current_object == None :
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169 current_object = BNode()
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170 typed_resource = current_object
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171
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172 if not node.hasAttribute("inlist") and current_object != None :
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173 # In this case the newly defined object is, in fact, the head of the list
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174 # just reset the whole thing.
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175 state.reset_list_mapping(origin = current_object)
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176
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177 elif node.hasAttribute("property") and not has_one_of_attributes(node, "content", "datatype") :
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178 current_subject = header_check(parent_object)
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179
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180 # this is the case when the property may take hold of @src and friends...
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181 if node.hasAttribute("about") :
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182 current_subject = state.getURI("about")
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183 if node.hasAttribute("typeof") : typed_resource = current_subject
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184
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185 # getURI may return None in case of an illegal CURIE, so
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186 # we have to be careful here, not use only an 'else'
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187 if current_subject == None :
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188 current_subject = parent_object
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189 else :
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190 state.reset_list_mapping(origin = current_subject)
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191
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192 if typed_resource == None and node.hasAttribute("typeof") :
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193 typed_resource = state.getResource("resource", "href", "src")
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194 if typed_resource == None :
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195 typed_resource = BNode()
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196 current_object = typed_resource
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197 else :
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198 current_object = current_subject
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199
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200 else :
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201 current_subject = header_check(parent_object)
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202
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203 # in this case all the various 'resource' setting attributes
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204 # behave identically, though they also have their own priority
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205 if current_subject == None :
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206 current_subject = state.getResource("about", "resource", "href", "src")
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207
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208 # get_URI_ref may return None in case of an illegal CURIE, so
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209 # we have to be careful here, not use only an 'else'
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210 if current_subject == None :
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211 if node.hasAttribute("typeof") :
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212 current_subject = BNode()
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213 state.reset_list_mapping(origin = current_subject)
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214 else :
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215 current_subject = parent_object
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216 else :
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217 state.reset_list_mapping(origin = current_subject)
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218
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219 # in this case no non-literal triples will be generated, so the
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220 # only role of the current_object Resource is to be transferred to
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221 # the children node
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222 current_object = current_subject
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223 if node.hasAttribute("typeof") : typed_resource = current_subject
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224
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225 # ---------------------------------------------------------------------
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226 ## The possible typeof indicates a number of type statements on the typed resource
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227 for defined_type in state.getURI("typeof") :
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228 if typed_resource :
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229 graph.add((typed_resource, ns_rdf["type"], defined_type))
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230
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231 # ---------------------------------------------------------------------
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232 # In case of @rel/@rev, either triples or incomplete triples are generated
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233 # the (possible) incomplete triples are collected, to be forwarded to the children
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234 incomplete_triples = []
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235 for prop in state.getURI("rel") :
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236 if not isinstance(prop,BNode) :
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237 if node.hasAttribute("inlist") :
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238 if current_object != None :
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239 # Add the content to the list. Note that if the same list
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240 # was initialized, at some point, by a None, it will be
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241 # overwritten by this real content
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242 state.add_to_list_mapping(prop, current_object)
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243 else :
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244 # Add a dummy entry to the list... Note that
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245 # if that list was initialized already with a real content
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246 # this call will have no effect
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247 state.add_to_list_mapping(prop, None)
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248
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249 # Add a placeholder into the hanging rels
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250 incomplete_triples.append( (None, prop, None) )
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251 else :
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252 theTriple = (current_subject, prop, current_object)
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253 if current_object != None :
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254 graph.add(theTriple)
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255 else :
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256 incomplete_triples.append(theTriple)
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257 else :
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258 state.options.add_warning(err_no_blank_node % "rel", warning_type=IncorrectBlankNodeUsage, node=node.nodeName)
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259
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260 for prop in state.getURI("rev") :
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261 if not isinstance(prop,BNode) :
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262 theTriple = (current_object,prop,current_subject)
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263 if current_object != None :
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264 graph.add(theTriple)
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265 else :
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266 incomplete_triples.append(theTriple)
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267 else :
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268 state.options.add_warning(err_no_blank_node % "rev", warning_type=IncorrectBlankNodeUsage, node=node.nodeName)
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269
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270 # ----------------------------------------------------------------------
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271 # Generation of the @property values, including literals. The newSubject is the subject
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272 # A particularity of property is that it stops the parsing down the DOM tree if an XML Literal is generated,
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273 # because everything down there is part of the generated literal.
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274 if node.hasAttribute("property") :
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275 ProcessProperty(node, graph, current_subject, state, typed_resource).generate_1_1()
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276
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277 # ----------------------------------------------------------------------
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278 # Setting the current object to a bnode is setting up a possible resource
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279 # for the incomplete triples downwards
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280 if current_object == None :
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281 object_to_children = BNode()
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282 else :
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283 object_to_children = current_object
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284
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285 #-----------------------------------------------------------------------
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286 # Here is the recursion step for all the children
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287 for n in node.childNodes :
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288 if n.nodeType == node.ELEMENT_NODE :
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289 _parse_1_1(n, graph, object_to_children, state, incomplete_triples)
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290
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291 # ---------------------------------------------------------------------
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292 # At this point, the parent's incomplete triples may be completed
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293 for (s,p,o) in parent_incomplete_triples :
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294 if s == None and o == None :
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295 # This is an encoded version of a hanging rel for a collection:
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296 incoming_state.add_to_list_mapping( p, current_subject )
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297 else :
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298 if s == None : s = current_subject
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299 if o == None : o = current_subject
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300 graph.add((s,p,o))
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301
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302 # Generate the lists, if any and if this is the level where a new list was originally created
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303 if state.new_list and not state.list_empty() :
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304 for prop in state.get_list_props() :
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305 vals = state.get_list_value(prop)
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306 if vals == None :
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307 # This was an empty list, in fact, ie, the list has been initiated by a <xxx rel="prop" inlist>
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308 # but no list content has ever been added
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309 graph.add( (state.get_list_origin(), prop, ns_rdf["nil"]) )
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310 else :
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311 heads = [ BNode() for r in vals ] + [ ns_rdf["nil"] ]
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312 for i in range(0, len(vals)) :
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313 graph.add( (heads[i], ns_rdf["first"], vals[i]) )
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314 graph.add( (heads[i], ns_rdf["rest"], heads[i+1]) )
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315 # Anchor the list
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316 graph.add( (state.get_list_origin(), prop, heads[0]) )
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317
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318 # -------------------------------------------------------------------
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319 # This should be it...
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320 # -------------------------------------------------------------------
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321 return
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322
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323
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324 ##################################################################################################################
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325 def _parse_1_0(node, graph, parent_object, incoming_state, parent_incomplete_triples) :
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326 """The (recursive) step of handling a single node. See the
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327 U{RDFa 1.0 syntax document<http://www.w3.org/TR/rdfa-syntax>} for further details.
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328
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329 This is the RDFa 1.0 version.
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330
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331 @param node: the DOM node to handle
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332 @param graph: the RDF graph
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333 @type graph: RDFLib's Graph object instance
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334 @param parent_object: the parent's object, as an RDFLib URIRef
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335 @param incoming_state: the inherited state (namespaces, lang, etc.)
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336 @type incoming_state: L{state.ExecutionContext}
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337 @param parent_incomplete_triples: list of hanging triples (the missing resource set to None) to be handled (or not)
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338 by the current node.
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339 @return: whether the caller has to complete it's parent's incomplete triples
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340 @rtype: Boolean
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341 """
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342
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343 # Update the state. This means, for example, the possible local settings of
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344 # namespaces and lang
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345 state = None
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346 state = ExecutionContext(node, graph, inherited_state=incoming_state)
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347
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348 #---------------------------------------------------------------------------------
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349 # Handling the role attribute is pretty much orthogonal to everything else...
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350 handle_role_attribute(node, graph, state)
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351
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352 #---------------------------------------------------------------------------------
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353 # Handle the special case for embedded RDF, eg, in SVG1.2.
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354 # This may add some triples to the target graph that does not originate from RDFa parsing
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355 # If the function return TRUE, that means that an rdf:RDF has been found. No
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356 # RDFa parsing should be done on that subtree, so we simply return...
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357 if state.options.embedded_rdf and node.nodeType == node.ELEMENT_NODE and handle_embeddedRDF(node, graph, state) :
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358 return
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359
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360 #---------------------------------------------------------------------------------
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361 # calling the host language specific massaging of the DOM
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362 if state.options.host_language in host_dom_transforms and node.nodeType == node.ELEMENT_NODE :
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363 for func in host_dom_transforms[state.options.host_language] : func(node, state)
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364
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365 #---------------------------------------------------------------------------------
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366 # First, let us check whether there is anything to do at all. Ie,
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367 # whether there is any relevant RDFa specific attribute on the element
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368 #
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369 if not has_one_of_attributes(node, "href", "resource", "about", "property", "rel", "rev", "typeof", "src") :
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370 # nop, there is nothing to do here, just go down the tree and return...
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371 for n in node.childNodes :
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372 if n.nodeType == node.ELEMENT_NODE : parse_one_node(n, graph, parent_object, state, parent_incomplete_triples)
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373 return
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374
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375 #-----------------------------------------------------------------
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376 # The goal is to establish the subject and object for local processing
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377 # The behaviour is slightly different depending on the presense or not
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378 # of the @rel/@rev attributes
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379 current_subject = None
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380 current_object = None
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381 prop_object = None
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382
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383 if has_one_of_attributes(node, "rel", "rev") :
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384 # in this case there is the notion of 'left' and 'right' of @rel/@rev
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385 # in establishing the new Subject and the objectResource
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386 current_subject = state.getResource("about","src")
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387
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388 # get_URI may return None in case of an illegal CURIE, so
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389 # we have to be careful here, not use only an 'else'
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390 if current_subject == None :
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391 if node.hasAttribute("typeof") :
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392 current_subject = BNode()
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393 else :
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394 current_subject = parent_object
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395 else :
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396 state.reset_list_mapping(origin = current_subject)
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397
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398 # set the object resource
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399 current_object = state.getResource("resource", "href")
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400
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401 else :
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402 # in this case all the various 'resource' setting attributes
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403 # behave identically, though they also have their own priority
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404 current_subject = state.getResource("about", "src", "resource", "href")
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405
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406 # get_URI_ref may return None in case of an illegal CURIE, so
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407 # we have to be careful here, not use only an 'else'
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408 if current_subject == None :
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409 if node.hasAttribute("typeof") :
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410 current_subject = BNode()
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411 else :
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412 current_subject = parent_object
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413 current_subject = parent_object
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414 else :
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415 state.reset_list_mapping(origin = current_subject)
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416
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417 # in this case no non-literal triples will be generated, so the
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418 # only role of the current_object Resource is to be transferred to
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419 # the children node
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420 current_object = current_subject
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421
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422 # ---------------------------------------------------------------------
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423 ## The possible typeof indicates a number of type statements on the new Subject
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424 for defined_type in state.getURI("typeof") :
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425 graph.add((current_subject, ns_rdf["type"], defined_type))
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426
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427 # ---------------------------------------------------------------------
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428 # In case of @rel/@rev, either triples or incomplete triples are generated
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429 # the (possible) incomplete triples are collected, to be forwarded to the children
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430 incomplete_triples = []
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431 for prop in state.getURI("rel") :
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432 if not isinstance(prop,BNode) :
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433 theTriple = (current_subject, prop, current_object)
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434 if current_object != None :
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435 graph.add(theTriple)
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436 else :
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437 incomplete_triples.append(theTriple)
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438 else :
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439 state.options.add_warning(err_no_blank_node % "rel", warning_type=IncorrectBlankNodeUsage, node=node.nodeName)
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440
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441 for prop in state.getURI("rev") :
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442 if not isinstance(prop,BNode) :
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443 theTriple = (current_object,prop,current_subject)
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444 if current_object != None :
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445 graph.add(theTriple)
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446 else :
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447 incomplete_triples.append(theTriple)
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448 else :
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449 state.options.add_warning(err_no_blank_node % "rev", warning_type=IncorrectBlankNodeUsage, node=node.nodeName)
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450
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451 # ----------------------------------------------------------------------
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452 # Generation of the literal values. The newSubject is the subject
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453 # A particularity of property is that it stops the parsing down the DOM tree if an XML Literal is generated,
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454 # because everything down there is part of the generated literal.
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455 if node.hasAttribute("property") :
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456 ProcessProperty(node, graph, current_subject, state).generate_1_0()
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457
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458 # ----------------------------------------------------------------------
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459 # Setting the current object to a bnode is setting up a possible resource
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460 # for the incomplete triples downwards
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461 if current_object == None :
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462 object_to_children = BNode()
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463 else :
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464 object_to_children = current_object
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465
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466 #-----------------------------------------------------------------------
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467 # Here is the recursion step for all the children
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468 for n in node.childNodes :
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469 if n.nodeType == node.ELEMENT_NODE :
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470 _parse_1_0(n, graph, object_to_children, state, incomplete_triples)
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471
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472 # ---------------------------------------------------------------------
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473 # At this point, the parent's incomplete triples may be completed
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474 for (s,p,o) in parent_incomplete_triples :
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475 if s == None and o == None :
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476 # This is an encoded version of a hanging rel for a collection:
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477 incoming_state.add_to_list_mapping( p, current_subject )
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478 else :
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479 if s == None : s = current_subject
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480 if o == None : o = current_subject
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481 graph.add((s,p,o))
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482
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483 # -------------------------------------------------------------------
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484 # This should be it...
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485 # -------------------------------------------------------------------
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486 return
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487
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488
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489 #######################################################################
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490 # Handle the role attribute
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491 def handle_role_attribute(node, graph, state) :
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492 """
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493 Handling the role attribute, according to http://www.w3.org/TR/role-attribute/#using-role-in-conjunction-with-rdfa
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494 @param node: the DOM node to handle
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495 @param graph: the RDF graph
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496 @type graph: RDFLib's Graph object instance
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497 @param state: the inherited state (namespaces, lang, etc.)
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498 @type state: L{state.ExecutionContext}
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499 """
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500 if node.hasAttribute("role") :
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501 if node.hasAttribute("id") :
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502 id = node.getAttribute("id").strip()
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503 subject = URIRef(state.base + '#' + id)
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504 else :
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505 subject = BNode()
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506 predicate = URIRef('http://www.w3.org/1999/xhtml/vocab#role')
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507 for object in state.getURI("role") :
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508 graph.add((subject, predicate, object))
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509
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510
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511
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512
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513
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514
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515
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516
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517
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518
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519