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annotate planemo/lib/python3.7/site-packages/rdflib/plugins/parsers/pyMicrodata/microdata.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 # -*- coding: utf-8 -*-
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2 """
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3
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4 The core of the Microdata->RDF conversion, a more or less verbatim implementation of the
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5 U{W3C IG Note<http://www.w3.org/TR/microdata-rdf/>}. Because the implementation was also used to check
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6 the note itself, it tries to be fairly close to the text.
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7
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8
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9 @organization: U{World Wide Web Consortium<http://www.w3.org>}
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10 @author: U{Ivan Herman<a href="http://www.w3.org/People/Ivan/">}
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11 @license: This software is available for use under the
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12 U{W3C® SOFTWARE NOTICE AND LICENSE<href="http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231">}
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13 """
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14
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15 """
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16 $Id: microdata.py,v 1.4 2012/09/05 16:40:43 ivan Exp $
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17 $Date: 2012/09/05 16:40:43 $
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18
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19 Added a reaction on the RDFaStopParsing exception: if raised while setting up the local execution context, parsing
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20 is stopped (on the whole subtree)
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21 """
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22
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23 import sys
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24 if sys.version_info[0] >= 3 :
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25 from urllib.parse import urlsplit, urlunsplit
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26 else :
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27 from urllib.parse import urlsplit, urlunsplit
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28
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29 from types import *
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30
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31 import rdflib
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32 from rdflib import URIRef
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33 from rdflib import Literal
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34 from rdflib import BNode
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35 from rdflib import Namespace
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36 if rdflib.__version__ >= "3.0.0" :
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37 from rdflib import Graph
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38 from rdflib import RDF as ns_rdf
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39 from rdflib import RDFS as ns_rdfs
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40 from rdflib import XSD as ns_xsd
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41 else :
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42 from rdflib.Graph import Graph
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43 from rdflib.RDFS import RDFSNS as ns_rdfs
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44 from rdflib.Literal import _XSD_NS as ns_xsd
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45 from rdflib.RDF import RDFNS as ns_rdf
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46
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47 ns_owl = Namespace("http://www.w3.org/2002/07/owl#")
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48
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49 from .registry import registry, vocab_names
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50 from .utils import generate_RDF_collection, get_Literal, get_time_type
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51 from .utils import get_lang_from_hierarchy, is_absolute_URI, generate_URI, fragment_escape
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52
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53 MD_VOCAB = "http://www.w3.org/ns/md#"
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54 RDFA_VOCAB = URIRef("http://www.w3.org/ns/rdfa#usesVocabulary")
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55
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56 from . import debug
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57
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58 # Existing predicate schemes
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59 class PropertySchemes :
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60 vocabulary = "vocabulary"
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61 contextual = "contextual"
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62
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63 class ValueMethod :
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64 unordered = "unordered"
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65 list = "list"
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66
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67 # ----------------------------------------------------------------------------
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68
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69 class Evaluation_Context :
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70 """
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71 Evaluation context structure. See Section 4.1 of the U{W3C IG Note<http://www.w3.org/TR/microdata-rdf/>}for the details.
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72
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73 @ivar current_type : an absolute URL for the current type, used when an item does not contain an item type
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74 @ivar memory: mapping from items to RDF subjects
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75 @type memory: dictionary
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76 @ivar current_name: an absolute URL for the in-scope name, used for generating URIs for properties of items without an item type
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77 @ivar current_vocabulary: an absolute URL for the current vocabulary, from the registry
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78 """
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79 def __init__( self ) :
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80 self.current_type = None
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81 self.memory = {}
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82 self.current_name = None
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83 self.current_vocabulary = None
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84
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85 def get_memory( self, item ) :
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86 """
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87 Get the memory content (ie, RDF subject) for 'item', or None if not stored yet
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88 @param item: an 'item', in microdata terminology
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89 @type item: DOM Element Node
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90 @return: None, or an RDF Subject (URIRef or BNode)
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91 """
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92 if item in self.memory :
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93 return self.memory[item]
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94 else :
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95 return None
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96
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97 def set_memory( self, item, subject ) :
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98 """
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99 Set the memory content, ie, the subject, for 'item'.
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100 @param item: an 'item', in microdata terminology
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101 @type item: DOM Element Node
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102 @param subject: RDF Subject
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103 @type subject: URIRef or Blank Node
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104 """
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105 self.memory[item] = subject
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106
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107 def new_copy(self, itype) :
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108 """
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109 During the generation algorithm a new copy of the current context has to be done with a new current type.
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110
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111 At the moment, the content of memory is copied, ie, a fresh dictionary is created and the content copied over.
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112 Not clear whether that is necessary, though, maybe a simple reference is enough...
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113 @param itype : an absolute URL for the current type
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114 @return: a new evaluation context instance
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115 """
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116 retval = Evaluation_Context()
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117 for k in self.memory :
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118 retval.memory[k] = self.memory[k]
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119
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120 retval.current_type = itype
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121 retval.current_name = self.current_name
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122 retval.current_vocabulary = self.current_vocabulary
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123 return retval
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124
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125 def __str__(self) :
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126 retval = "Evaluation context:\n"
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127 retval += " current type: %s\n" % self.current_type
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128 retval += " current name: %s\n" % self.current_name
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129 retval += " current vocabulary: %s\n" % self.current_vocabulary
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130 retval += " memory: %s\n" % self.memory
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131 retval += "----\n"
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132 return retval
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133
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134 class Microdata :
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135 """
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136 This class encapsulates methods that are defined by the U{microdata spec<http://dev.w3.org/html5/md/Overview.html>},
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137 as opposed to the RDF conversion note.
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138
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139 @ivar document: top of the DOM tree, as returned by the HTML5 parser
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140 @ivar base: the base URI of the Dom tree, either set from the outside or via a @base element
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141 """
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142 def __init__( self, document, base = None) :
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143 """
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144 @param document: top of the DOM tree, as returned by the HTML5 parser
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145 @param base: the base URI of the Dom tree, either set from the outside or via a @base element
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146 """
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147 self.document = document
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148
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149 #-----------------------------------------------------------------
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150 # set the document base, will be used to generate top level URIs
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151 self.base = None
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152 # handle the base element case for HTML
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153 for set_base in document.getElementsByTagName("base") :
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154 if set_base.hasAttribute("href") :
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155 # Yep, there is a local setting for base
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156 self.base = set_base.getAttribute("href")
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157 return
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158 # If got here, ie, if no local setting for base occurs, the input argument has it
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159 self.base = base
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160
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161 def get_top_level_items( self ) :
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162 """
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163 A top level item is and element that has the @itemscope set, but no @itemtype. They have to
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164 be collected in pre-order and depth-first fashion.
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165
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166 @return: list of items (ie, DOM Nodes)
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167 """
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168 def collect_items( node ) :
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169 items = []
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170 for child in node.childNodes :
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171 if child.nodeType == node.ELEMENT_NODE :
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172 items += collect_items( child )
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173
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174 if node.hasAttribute("itemscope") and not node.hasAttribute("itemprop") :
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175 # This is also a top level item
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176 items.append(node)
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177
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178 return items
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179
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180 return collect_items( self.document )
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181
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182 def get_item_properties( self, item ) :
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183 """
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184 Collect the item's properties, ie, all DOM descendent nodes with @itemprop until the subtree hits another
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185 @itemscope. @itemrefs are also added at this point.
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186
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187 @param item: current item
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188 @type item: DOM Node
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189 @return: array of items, ie, DOM Nodes
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190 """
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191 # go down the tree until another itemprop is hit, take care of the itemrefs, too; see the microdata doc
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192 # probably the ugliest stuff
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193 # returns a series of element nodes.
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194 # Is it worth filtering the ones with itemprop at that level???
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195 results = []
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196 memory = [ item ]
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197 pending = [ child for child in item.childNodes if child.nodeType == item.ELEMENT_NODE ]
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198
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199 if item.hasAttribute("itemref") :
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200 for id in item.getAttribute("itemref").strip().split() :
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201 obj = self.getElementById(id)
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202 if obj != None : pending.append(obj)
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203
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204 while len(pending) > 0 :
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205 current = pending.pop(0)
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206 if current in memory :
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207 # in general this raises an error; the same item cannot be there twice. In this case this is
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208 # simply ignored
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209 continue
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210 else :
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211 # this for the check above
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212 memory.append(current)
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213
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214 # @itemscope is the barrier...
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215 if not current.hasAttribute("itemscope") :
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216 pending = [ child for child in current.childNodes if child.nodeType == child.ELEMENT_NODE ] + pending
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217
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218 if current.hasAttribute("itemprop") and current.getAttribute("itemprop").strip() != "" :
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219 results.append(current)
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220
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221 return results
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222
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223 def getElementById(self, id) :
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224 """This is a method defined for DOM 2 HTML, but the HTML5 parser does not seem to define it. Oh well...
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225 @param id: value of an @id attribute to look for
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226 @return: array of nodes whose @id attribute matches C{id} (formally, there should be only one...)
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227 """
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228 def collect_ids( node ) :
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229 ids = []
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230 for child in node.childNodes :
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231 if child.nodeType == node.ELEMENT_NODE :
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232 ids += collect_ids( child )
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233
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234 if node.hasAttribute("id") and node.getAttribute("id") == id :
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235 # This is also a top level item
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236 ids.append(node)
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237
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238 return ids
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239
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240 ids = collect_ids(self.document)
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241 if len(ids) > 0 :
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242 return ids[0]
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243 else :
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244 return None
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245
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246 class MicrodataConversion(Microdata) :
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247 """
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248 Top level class encapsulating the conversion algorithms as described in the W3C note.
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249
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250 @ivar graph: an RDF graph; an RDFLib Graph
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251 @type graph: RDFLib Graph
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252 @ivar document: top of the DOM tree, as returned by the HTML5 parser
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253 @ivar ns_md: the Namespace for the microdata vocabulary
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254 @ivar base: the base of the Dom tree, either set from the outside or via a @base element
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255 """
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256 def __init__( self, document, graph, base = None, vocab_expansion = False, vocab_cache = True ) :
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257 """
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258 @param graph: an RDF graph; an RDFLib Graph
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259 @type graph: RDFLib Graph
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260 @param document: top of the DOM tree, as returned by the HTML5 parser
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261 @keyword base: the base of the Dom tree, either set from the outside or via a @base element
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262 @keyword vocab_expansion: whether vocab expansion should be performed or not
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263 @type vocab_expansion: Boolean
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264 @keyword vocab_cache: if vocabulary expansion is done, then perform caching of the vocabulary data
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265 @type vocab_cache: Boolean
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266 """
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267 Microdata.__init__(self, document, base)
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268 self.vocab_expansion = vocab_expansion
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269 self.vocab_cache = vocab_cache
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270 self.graph = graph
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271 self.ns_md = Namespace( MD_VOCAB )
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272 self.graph.bind( "md",MD_VOCAB )
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273 self.vocabularies_used = False
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274
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275 # Get the vocabularies defined in the registry bound to proper names, if any...
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276
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277 def _use_rdfa_context () :
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278 try :
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279 from ..pyRdfa.initialcontext import initial_context
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280 except :
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281 from pyRdfa.initialcontext import initial_context
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282 retval = {}
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283 vocabs = initial_context["http://www.w3.org/2011/rdfa-context/rdfa-1.1"].ns
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284 for prefix in list(vocabs.keys()) :
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285 uri = vocabs[prefix]
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286 if uri not in vocab_names and uri not in registry : retval[uri] = prefix
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287 return retval
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288
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289 for vocab in registry :
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290 if vocab in vocab_names :
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291 self.graph.bind( vocab_names[vocab],vocab )
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292 else :
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293 hvocab = vocab + '#'
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294 if hvocab in vocab_names :
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295 self.graph.bind( vocab_names[hvocab],hvocab )
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296
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297 # Add the prefixes defined in the RDFa initial context to improve the outlook of the output
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298 # I put this into a try: except: in case the pyRdfa package is not available...
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299 try :
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300 try :
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301 from ..pyRdfa.initialcontext import initial_context
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302 except :
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303 from pyRdfa.initialcontext import initial_context
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304 vocabs = initial_context["http://www.w3.org/2011/rdfa-context/rdfa-1.1"].ns
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305 for prefix in list(vocabs.keys()) :
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306 uri = vocabs[prefix]
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307 if uri not in registry :
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308 # if it is in the registry, then it may have needed some special microdata massage...
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309 self.graph.bind( prefix,uri )
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310 except :
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311 pass
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312
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313 def convert( self ) :
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314 """
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315 Top level entry to convert and generate all the triples. It finds the top level items,
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316 and generates triples for each of them; additionally, it generates a top level entry point
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317 to the items from base in the form of an RDF list.
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318 """
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319 item_list = []
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320 for top_level_item in self.get_top_level_items() :
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321 item_list.append( self.generate_triples(top_level_item, Evaluation_Context()) )
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322 list = generate_RDF_collection( self.graph, item_list )
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323 self.graph.add( (URIRef(self.base),self.ns_md["item"],list) )
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324
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325 # If the vocab expansion is also switched on, this is the time to do it.
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326
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327 # This is the version with my current proposal: the basic expansion is always there;
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328 # the follow-your-nose inclusion of vocabulary is optional
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329 if self.vocabularies_used :
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330 try :
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331 try :
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332 from ..pyRdfa.rdfs.process import MiniOWL, process_rdfa_sem
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333 from ..pyRdfa.options import Options
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334 except :
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335 from pyRdfa.rdfs.process import MiniOWL, process_rdfa_sem
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336 from pyRdfa.options import Options
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337 # if we did not get here, the pyRdfa package could not be
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338 # imported. Too bad, but life should go on in the except branch...
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339 if self.vocab_expansion :
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340 # This is the full deal
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341 options = Options(vocab_expansion = self.vocab_expansion, vocab_cache = self.vocab_cache)
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342 process_rdfa_sem(self.graph, options)
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343 else :
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344 MiniOWL(self.graph).closure()
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345 except :
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346 pass
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347
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348 def generate_triples( self, item, context ) :
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349 """
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350 Generate the triples for a specific item. See the W3C Note for the details.
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351
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352 @param item: the DOM Node for the specific item
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353 @type item: DOM Node
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354 @param context: an instance of an evaluation context
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355 @type context: L{Evaluation_Context}
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356 @return: a URIRef or a BNode for the (RDF) subject
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357 """
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358 # Step 1,2: if the subject has to be set, store it in memory
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359 subject = context.get_memory( item )
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360 if subject == None :
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361 # nop, there is no subject set. If there is a valid @itemid, that carries it
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362 if item.hasAttribute("itemid") and is_absolute_URI( item.getAttribute("itemid") ):
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363 subject = URIRef( item.getAttribute("itemid").strip() )
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364 else :
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365 subject = BNode()
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366 context.set_memory( item, subject )
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367
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368 # Step 3: set the type triples if any
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369 types = []
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370 if item.hasAttribute("itemtype") :
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371 types = item.getAttribute("itemtype").strip().split()
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372 for t in types :
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373 if is_absolute_URI( t ) :
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374 self.graph.add( (subject, ns_rdf["type"], URIRef(t)) )
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375
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376 # Step 4, 5 and 6 to set the typing variable
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377 if len(types) == 0 :
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378 itype = None
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379 else :
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380 if is_absolute_URI(types[0]) :
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381 itype = types[0]
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382 context.current_name = None
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383 elif context.current_type != None :
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384 itype = context.current_type
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385 else :
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386 itype = None
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387
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388 # Step 7, 8, 9: Check the registry for possible keys and set the vocab
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389 vocab = None
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390 if itype != None :
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391 for key in list(registry.keys()) :
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392 if itype.startswith(key) :
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393 # There is a predefined vocabulary for this type...
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394 vocab = key
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395 # Step 7: Issue an rdfa usesVocabulary triple
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396 self.graph.add( (URIRef(self.base), RDFA_VOCAB, URIRef(vocab)))
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397 self.vocabularies_used = True
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398 break
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399 # The registry has not set the vocabulary; has to be extracted from the type
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400 if vocab == None :
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401 parsed = urlsplit(itype)
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402 if parsed.fragment != "" :
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403 vocab = urlunsplit( (parsed.scheme,parsed.netloc,parsed.path,parsed.query,"") ) + '#'
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404 elif parsed.path == "" and parsed.query == "" :
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405 vocab = itype
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406 if vocab[-1] != '/' : vocab += '/'
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407 else :
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408 vocab = itype.rsplit('/',1)[0] + '/'
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409
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410 # Step 9: update vocab in the context
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411 if vocab != None :
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412 context.current_vocabulary = vocab
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413 elif item.hasAttribute("itemtype") :
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414 context.current_vocabulary = None
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415
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416 # Step 10: set up a property list; this will be used to generate triples later.
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417 # each entry in the dictionary is an array of RDF objects
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418 property_list = {}
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419
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420 # Step 11: Get the item properties and run a cycle on those
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421 for prop in self.get_item_properties(item) :
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422 for name in prop.getAttribute("itemprop").strip().split() :
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423 # 11.1.1. set a new context
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424 new_context = context.new_copy(itype)
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425 # 11.1.2, generate the URI for the property name, that will be the predicate
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426 # Also update the context
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427 new_context.current_name = predicate = self.generate_predicate_URI( name,new_context )
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428 # 11.1.3, generate the property value. The extra flag signals that the value is a new item
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429 # Note that 10.1.4 step is done in the method itself, ie, a recursion may occur there
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430 # if a new item is hit (in which case the return value is a RDF resource chaining to a subject)
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431 value = self.get_property_value( prop, new_context )
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432 # 11.1.5, store all the values
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433 if predicate in property_list :
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434 property_list[predicate].append(value)
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435 else :
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436 property_list[predicate] = [ value ]
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437
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438 # step 12: generate the triples
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439 for property in list(property_list.keys()) :
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440 self.generate_property_values( subject, URIRef(property), property_list[property], context )
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441
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442 # Step 13: return the subject to the caller
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443 return subject
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444
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445 def generate_predicate_URI( self, name, context ) :
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446 """
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447 Generate a full URI for a predicate, using the type, the vocabulary, etc.
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448
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449 For details of this entry, see Section 4.4
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450 @param name: name of the property, ie, what appears in @itemprop
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451 @param context: an instance of an evaluation context
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452 @type context: L{Evaluation_Context}
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453 """
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454 if debug: print(( "name: %s, %s" % (name,context) ))
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455
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456 # Step 1: absolute URI-s are fine, take them as they are
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457 if is_absolute_URI(name) : return name
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458
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459 # Step 2: if type is none, that this is just used as a fragment
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460 # if not context.current_type :
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461 if context.current_type == None and context.current_vocabulary == None :
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462 if self.base[-1] == '#' :
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463 b = self.base[:-1]
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464 else :
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465 b = self.base
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466 return b + '#' + fragment_escape(name)
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467
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468 #if context.current_type == None :
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469 # return generate_URI( self.base, name )
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470
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471 # Step 3: set the scheme
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472 try :
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473 if context.current_vocabulary in registry and "propertyURI" in registry[context.current_vocabulary] :
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474 scheme = registry[context.current_vocabulary]["propertyURI"]
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475 else :
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476 scheme = PropertySchemes.vocabulary
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477 except :
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478 # This is when the structure of the registry is broken
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479 scheme = PropertySchemes.vocabulary
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480
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481 name = fragment_escape( name )
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482 if scheme == PropertySchemes.contextual :
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483 # Step 5.1
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484 s = context.current_name
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485 # s = context.current_type
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486 if s != None and s.startswith("http://www.w3.org/ns/md?type=") :
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487 # Step 5.2
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488 expandedURI = s + '.' + name
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489 else :
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490 # Step 5.3
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491 expandedURI = "http://www.w3.org/ns/md?type=" + fragment_escape(context.current_type) + "&prop=" + name
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492 else :
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493 # Step 4
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494 if context.current_vocabulary[-1] == '#' or context.current_vocabulary[-1] == '/' :
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495 expandedURI = context.current_vocabulary + name
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496 else :
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497 expandedURI = context.current_vocabulary + '#' + name
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498
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499 # see if there are subproperty/equivalentproperty relations
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500 try :
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501 vocab_mapping = registry[context.current_vocabulary]["properties"][name]
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502 # if we got that far, we may have some mappings
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diff changeset
503
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
504 expandedURIRef = URIRef(expandedURI)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
505 try :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
506 subpr = vocab_mapping["subPropertyOf"]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
507 if subpr != None :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
508 if isinstance(subpr,list) :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
509 for p in subpr :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
510 self.graph.add( (expandedURIRef, ns_rdfs["subPropertyOf"], URIRef(p)) )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
511 else :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
512 self.graph.add( (expandedURIRef, ns_rdfs["subPropertyOf"], URIRef(subpr)) )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
513 except :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
514 # Ok, no sub property
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
515 pass
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
516 try :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
517 subpr = vocab_mapping["equivalentProperty"]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
518 if subpr != None :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
519 if isinstance(subpr,list) :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
520 for p in subpr :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
521 self.graph.add( (expandedURIRef, ns_owl["equivalentProperty"], URIRef(p)) )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
522 else :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
523 self.graph.add( (expandedURIRef, ns_owl["equivalentProperty"], URIRef(subpr)) )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
524 except :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
525 # Ok, no sub property
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
526 pass
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
527 except :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
528 # no harm done, no extra vocabulary term
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
529 pass
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
530
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
531
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
532 return expandedURI
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
533
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
534 def get_property_value(self, node, context) :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
535 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
536 Generate an RDF object, ie, the value of a property. Note that if this element contains
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
537 an @itemscope, then a recursive call to L{MicrodataConversion.generate_triples} is done and the
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
538 return value of that method (ie, the subject for the corresponding item) is return as an
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
539 object.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
540
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
541 Otherwise, either URIRefs are created for <a>, <img>, etc, elements, or a Literal; the latter
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
542 gets a time-related type for the <time> element.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
543
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
544 @param node: the DOM Node for which the property values should be generated
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
545 @type node: DOM Node
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
546 @param context: an instance of an evaluation context
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
547 @type context: L{Evaluation_Context}
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
548 @return: an RDF resource (URIRef, BNode, or Literal)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
549 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
550 URI_attrs = {
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
551 "audio" : "src",
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
552 "embed" : "src",
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
553 "iframe" : "src",
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
554 "img" : "src",
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
555 "source" : "src",
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
556 "track" : "src",
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
557 "video" : "src",
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
558 "data" : "src",
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
559 "a" : "href",
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
560 "area" : "href",
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
561 "link" : "href",
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
562 "object" : "data"
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
563 }
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
564 lang = get_lang_from_hierarchy( self.document, node )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
565
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
566 if node.hasAttribute("itemscope") :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
567 # THIS IS A RECURSION ENTRY POINT!
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
568 return self.generate_triples( node, context )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
569
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
570 elif node.tagName in URI_attrs and node.hasAttribute(URI_attrs[node.tagName]) :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
571 return URIRef( generate_URI( self.base, node.getAttribute(URI_attrs[node.tagName]).strip() ) )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
572
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
573 elif node.tagName == "meta" and node.hasAttribute("content") :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
574 if lang :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
575 return Literal( node.getAttribute("content"), lang = lang )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
576 else :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
577 return Literal( node.getAttribute("content") )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
578
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
579 elif node.tagName == "meter" or node.tagName == "data" :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
580 if node.hasAttribute("value") :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
581 val = node.getAttribute("value")
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
582 # check whether the attribute value can be defined as a float or an integer
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
583 try :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
584 fval = int(val)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
585 dt = ns_xsd["integer"]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
586 except :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
587 # Well, not an int, try then a integer
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
588 try :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
589 fval = float(val)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
590 dt = ns_xsd["float"]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
591 except :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
592 # Sigh, this is not a valid value, but let it go through as a plain literal nevertheless
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
593 fval = val
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
594 dt = None
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
595 if dt :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
596 return Literal( val, datatype = dt)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
597 else :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
598 return Literal( val )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
599 else :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
600 return Literal( "" )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
601
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
602 elif node.tagName == "time" and node.hasAttribute("datetime") :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
603 litval = node.getAttribute("datetime")
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
604 dtype = get_time_type(litval)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
605 if dtype :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
606 return Literal( litval, datatype = dtype )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
607 else :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
608 return Literal( litval )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
609
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
610 else :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
611 if lang :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
612 return Literal( get_Literal(node), lang = lang )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
613 else :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
614 return Literal( get_Literal(node) )
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
615
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
616 def generate_property_values( self, subject, predicate, objects, context) :
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
617 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
618 Generate the property values for a specific subject and predicate. The context should specify whether
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
619 the objects should be added in an RDF list or each triples individually.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
620
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
621 @param subject: RDF subject
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
622 @type subject: RDFLib Node (URIRef or blank node)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
623 @param predicate: RDF predicate
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
624 @type predicate: RDFLib URIRef
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
625 @param objects: RDF objects
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
626 @type objects: list of RDFLib nodes (URIRefs, Blank Nodes, or literals)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
627 @param context: evaluation context
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
628 @type context: L{Evaluation_Context}
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
629 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
630 # generate triples with a list, or a bunch of triples, depending on the context
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
631 # The biggest complication is to find the method...
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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632 method = ValueMethod.unordered
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633 superproperties = None
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634
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635 # This is necessary because predicate is a URIRef, and I am not sure the comparisons would work well
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636 # to be tested, in fact...
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637 pred_key = "%s" % predicate
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638 for key in registry :
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639 if predicate.startswith(key) :
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640 # This the part of the registry corresponding to the predicate's vocabulary
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641 registry_object = registry[key]
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642 try :
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643 if "multipleValues" in registry_object : method = registry_object["multipleValues"]
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644 # The generic definition can be overwritten for a specific property. The simplest is to rely on a 'try'
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645 # with the right structure...
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646 try :
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647 method = registry_object["properties"][pred_key[len(key):]]["multipleValues"]
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648 except :
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649 pass
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650 except :
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651 pass
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652
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653 if method == ValueMethod.unordered :
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654 for object in objects :
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655 self.graph.add( (subject, predicate, object) )
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656 else :
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657 self.graph.add( (subject,predicate,generate_RDF_collection( self.graph, objects )) )
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658
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659
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660
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661
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662
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663