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annotate planemo/lib/python3.7/site-packages/rdflib/plugins/parsers/pyRdfa/state.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 Parser's execution context (a.k.a. state) object and handling. The state includes:
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4
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5 - language, retrieved from C{@xml:lang} or C{@lang}
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6 - URI base, determined by C{<base>} or set explicitly. This is a little bit superfluous, because the current RDFa syntax does not make use of C{@xml:base}; i.e., this could be a global value. But the structure is prepared to add C{@xml:base} easily, if needed.
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7 - options, in the form of an L{options<pyRdfa.options>} instance
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8 - a separate vocabulary/CURIE handling resource, in the form of an L{termorcurie<pyRdfa.TermOrCurie>} instance
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9
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10 The execution context object is also used to handle URI-s, CURIE-s, terms, etc.
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11
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12 @summary: RDFa parser execution context
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13 @organization: U{World Wide Web Consortium<http://www.w3.org>}
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14 @author: U{Ivan Herman<a href="http://www.w3.org/People/Ivan/">}
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15 @license: This software is available for use under the
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16 U{W3C® SOFTWARE NOTICE AND LICENSE<href="http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231">}
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17 """
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18
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19 """
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20 $Id: state.py,v 1.23 2013-10-16 11:48:54 ivan Exp $
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21 $Date: 2013-10-16 11:48:54 $
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22 """
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23 import sys
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24 (py_v_major, py_v_minor, py_v_micro, py_v_final, py_v_serial) = sys.version_info
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25
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26 import rdflib
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27 from rdflib import URIRef
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28 from rdflib import Literal
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29 from rdflib import BNode
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30 from rdflib import Namespace
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31 if rdflib.__version__ >= "3.0.0" :
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32 from rdflib import RDF as ns_rdf
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33 from rdflib import RDFS as ns_rdfs
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34 else :
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35 from rdflib.RDFS import RDFSNS as ns_rdfs
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36 from rdflib.RDF import RDFNS as ns_rdf
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37
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38 from .options import Options
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39 from .utils import quote_URI
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40 from .host import HostLanguage, accept_xml_base, accept_xml_lang, beautifying_prefixes
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41
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42 from .termorcurie import TermOrCurie
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43 from . import UnresolvablePrefix, UnresolvableTerm
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44
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45 from . import err_lang
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46 from . import err_URI_scheme
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47 from . import err_illegal_safe_CURIE
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48 from . import err_no_CURIE_in_safe_CURIE
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49 from . import err_undefined_terms
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50 from . import err_non_legal_CURIE_ref
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51 from . import err_undefined_CURIE
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52
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53 if py_v_major >= 3 :
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54 from urllib.parse import urlparse, urlunparse, urlsplit, urljoin
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55 else :
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56 from urllib.parse import urlparse, urlunparse, urlsplit, urljoin
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57
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58 class ListStructure :
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59 """Special class to handle the C{@inlist} type structures in RDFa 1.1; stores the "origin", i.e,
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60 where the list will be attached to, and the mappings as defined in the spec.
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61 """
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62 def __init__(self) :
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63 self.mapping = {}
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64 self.origin = None
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65
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66 #### Core Class definition
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67 class ExecutionContext :
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68 """State at a specific node, including the current set of namespaces in the RDFLib sense, current language,
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69 the base, vocabularies, etc. The class is also used to interpret URI-s and CURIE-s to produce
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70 URI references for RDFLib.
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71
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72 @ivar options: reference to the overall options
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73 @type options: L{Options}
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74 @ivar base: the 'base' URI
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75 @ivar parsedBase: the parsed version of base, as produced by urlparse.urlsplit
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76 @ivar defaultNS: default namespace (if defined via @xmlns) to be used for XML Literals
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77 @ivar lang: language tag (possibly None)
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78 @ivar term_or_curie: vocabulary management class instance
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79 @type term_or_curie: L{termorcurie.TermOrCurie}
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80 @ivar list_mapping: dictionary of arrays, containing a list of URIs key-ed via properties for lists
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81 @ivar node: the node to which this state belongs
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82 @type node: DOM node instance
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83 @ivar rdfa_version: RDFa version of the content
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84 @type rdfa_version: String
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85 @ivar supress_lang: in some cases, the effect of the lang attribute should be supressed for the given node, although it should be inherited down below (example: @value attribute of the data element in HTML5)
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86 @type supress_lang: Boolean
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87 @cvar _list: list of attributes that allow for lists of values and should be treated as such
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88 @cvar _resource_type: dictionary; mapping table from attribute name to the exact method to retrieve the URI(s). Is initialized at first instantiation.
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89 """
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90
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91 # list of attributes that allow for lists of values and should be treated as such
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92 _list = [ "rel", "rev", "property", "typeof", "role" ]
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93 # mapping table from attribute name to the exact method to retrieve the URI(s).
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94 _resource_type = {}
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95
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96 def __init__(self, node, graph, inherited_state=None, base="", options=None, rdfa_version = None) :
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97 """
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98 @param node: the current DOM Node
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99 @param graph: the RDFLib Graph
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100 @keyword inherited_state: the state as inherited
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101 from upper layers. This inherited_state is mixed with the state information
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102 retrieved from the current node.
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103 @type inherited_state: L{state.ExecutionContext}
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104 @keyword base: string denoting the base URI for the specific node. This overrides the possible
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105 base inherited from the upper layers. The
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106 current XHTML+RDFa syntax does not allow the usage of C{@xml:base}, but SVG1.2 does, so this is
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107 necessary for SVG (and other possible XML dialects that accept C{@xml:base})
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108 @keyword options: invocation options, and references to warning graphs
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109 @type options: L{Options<pyRdfa.options>}
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110 """
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111 def remove_frag_id(uri) :
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112 """
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113 The fragment ID for self.base must be removed
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114 """
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115 try :
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116 # To be on the safe side:-)
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117 t = urlparse(uri)
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118 return urlunparse((t[0],t[1],t[2],t[3],t[4],""))
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119 except :
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120 return uri
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121
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122 # This is, conceptually, an additional class initialization, but it must be done run time, otherwise import errors show up
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123 if len( ExecutionContext._resource_type ) == 0 :
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124 ExecutionContext._resource_type = {
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125 "href" : ExecutionContext._URI,
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126 "src" : ExecutionContext._URI,
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127 "vocab" : ExecutionContext._URI,
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128
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129 "about" : ExecutionContext._CURIEorURI,
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130 "resource" : ExecutionContext._CURIEorURI,
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131
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132 "rel" : ExecutionContext._TERMorCURIEorAbsURI,
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133 "rev" : ExecutionContext._TERMorCURIEorAbsURI,
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134 "datatype" : ExecutionContext._TERMorCURIEorAbsURI,
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135 "typeof" : ExecutionContext._TERMorCURIEorAbsURI,
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136 "property" : ExecutionContext._TERMorCURIEorAbsURI,
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137 "role" : ExecutionContext._TERMorCURIEorAbsURI,
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138 }
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139 #-----------------------------------------------------------------
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140 self.node = node
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141
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142 #-----------------------------------------------------------------
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143 # Settling the base. In a generic XML, xml:base should be accepted at all levels (though this is not the
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144 # case in, say, XHTML...)
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145 # At the moment, it is invoked with a 'None' at the top level of parsing, that is
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146 # when the <base> element is looked for (for the HTML cases, that is)
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147 if inherited_state :
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148 self.rdfa_version = inherited_state.rdfa_version
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149 self.base = inherited_state.base
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150 self.options = inherited_state.options
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151
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152 self.list_mapping = inherited_state.list_mapping
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153 self.new_list = False
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154
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155 # for generic XML versions the xml:base attribute should be handled
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156 if self.options.host_language in accept_xml_base and node.hasAttribute("xml:base") :
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157 self.base = remove_frag_id(node.getAttribute("xml:base"))
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158 else :
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159 # this is the branch called from the very top
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160 self.list_mapping = ListStructure()
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161 self.new_list = True
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162
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163 if rdfa_version is not None :
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164 self.rdfa_version = rdfa_version
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165 else :
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166 from . import rdfa_current_version
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167 self.rdfa_version = rdfa_current_version
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168
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169 # This value can be overwritten by a @version attribute
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170 if node.hasAttribute("version") :
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171 top_version = node.getAttribute("version")
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172 if top_version.find("RDFa 1.0") != -1 or top_version.find("RDFa1.0") != -1 :
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173 self.rdfa_version = "1.0"
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174 elif top_version.find("RDFa 1.1") != -1 or top_version.find("RDFa1.1") != -1 :
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175 self.rdfa_version = "1.1"
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176
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177 # this is just to play safe. I believe this should actually not happen...
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178 if options == None :
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179 from . import Options
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180 self.options = Options()
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181 else :
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182 self.options = options
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183
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184 self.base = ""
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185 # handle the base element case for HTML
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186 if self.options.host_language in [ HostLanguage.xhtml, HostLanguage.html5, HostLanguage.xhtml5 ] :
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187 for bases in node.getElementsByTagName("base") :
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188 if bases.hasAttribute("href") :
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189 self.base = remove_frag_id(bases.getAttribute("href"))
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190 continue
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191 elif self.options.host_language in accept_xml_base and node.hasAttribute("xml:base") :
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192 self.base = remove_frag_id(node.getAttribute("xml:base"))
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193
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194 # If no local setting for base occurs, the input argument has it
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195 if self.base == "" :
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196 self.base = base
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197
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198 # Perform an extra beautification in RDFLib
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199 if self.options.host_language in beautifying_prefixes :
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200 dict = beautifying_prefixes[self.options.host_language]
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201 for key in dict :
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202 graph.bind(key,dict[key])
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203
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204 input_info = "Input Host Language:%s, RDFa version:%s, base:%s" % (self.options.host_language, self.rdfa_version, self.base)
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205 self.options.add_info(input_info)
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206
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207
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208 #-----------------------------------------------------------------
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209 # this will be used repeatedly, better store it once and for all...
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210 self.parsedBase = urlsplit(self.base)
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211
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212 #-----------------------------------------------------------------
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213 # generate and store the local CURIE handling class instance
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214 self.term_or_curie = TermOrCurie(self, graph, inherited_state)
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215
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216 #-----------------------------------------------------------------
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217 # Settling the language tags
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218 # @lang has priority over @xml:lang
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219 # it is a bit messy: the three fundamental modes (xhtml, html, or xml) are all slightly different:-(
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220 # first get the inherited state's language, if any
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221 if inherited_state :
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222 self.lang = inherited_state.lang
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223 else :
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224 self.lang = None
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225
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226 self.supress_lang = False
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227
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228
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229 if self.options.host_language in [ HostLanguage.xhtml, HostLanguage.xhtml5, HostLanguage.html5 ] :
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230 # we may have lang and xml:lang
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231 if node.hasAttribute("lang") :
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232 lang = node.getAttribute("lang").lower()
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233 else :
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234 lang = None
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235 if node.hasAttribute("xml:lang") :
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236 xmllang = node.getAttribute("xml:lang").lower()
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237 else :
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238 xmllang = None
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239 # First of all, set the value, if any
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240 if xmllang != None :
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241 # this has priority
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242 if len(xmllang) != 0 :
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243 self.lang = xmllang
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244 else :
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245 self.lang = None
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246 elif lang != None :
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247 if len(lang) != 0 :
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248 self.lang = lang
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249 else :
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250 self.lang = None
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251 # Ideally, a warning should be generated if lang and xmllang are both present with different values. But
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252 # the HTML5 Parser does its magic by overriding a lang value if xmllang is present, so the potential
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253 # error situations are simply swallowed...
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254
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255 elif self.options.host_language in accept_xml_lang and node.hasAttribute("xml:lang") :
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256 self.lang = node.getAttribute("xml:lang").lower()
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257 if len(self.lang) == 0 : self.lang = None
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258
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259 #-----------------------------------------------------------------
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260 # Set the default namespace. Used when generating XML Literals
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261 if node.hasAttribute("xmlns") :
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262 self.defaultNS = node.getAttribute("xmlns")
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263 elif inherited_state and inherited_state.defaultNS != None :
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264 self.defaultNS = inherited_state.defaultNS
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265 else :
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266 self.defaultNS = None
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267 # end __init__
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268
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269 def _URI(self, val) :
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270 """Returns a URI for a 'pure' URI (ie, not a CURIE). The method resolves possible relative URI-s. It also
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271 checks whether the URI uses an unusual URI scheme (and issues a warning); this may be the result of an
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272 uninterpreted CURIE...
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273 @param val: attribute value to be interpreted
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274 @type val: string
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275 @return: an RDFLib URIRef instance
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276 """
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277 def create_URIRef(uri, check = True) :
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278 """
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279 Mini helping function: it checks whether a uri is using a usual scheme before a URIRef is created. In case
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280 there is something unusual, a warning is generated (though the URIRef is created nevertheless)
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281 @param uri: (absolute) URI string
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282 @return: an RDFLib URIRef instance
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283 """
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284 from . import uri_schemes
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285 val = uri.strip()
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286 if check and urlsplit(val)[0] not in uri_schemes :
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287 self.options.add_warning(err_URI_scheme % val.strip(), node=self.node.nodeName)
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288 return URIRef(val)
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289
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290 def join(base, v, check = True) :
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291 """
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292 Mini helping function: it makes a urljoin for the paths. Based on the python library, but
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293 that one has a bug: in some cases it
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294 swallows the '#' or '?' character at the end. This is clearly a problem with
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295 Semantic Web URI-s, so this is checked, too
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296 @param base: base URI string
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297 @param v: local part
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298 @param check: whether the URI should be checked against the list of 'existing' URI schemes
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299 @return: an RDFLib URIRef instance
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300 """
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301 # UGLY!!! There is a bug for a corner case in python version <= 2.5.X
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302 if len(v) > 0 and v[0] == '?' and (py_v_major < 3 and py_v_minor <= 5) :
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303 return create_URIRef(base+v, check)
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304 ####
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305
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306 joined = urljoin(base, v)
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307 try :
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308 if v[-1] != joined[-1] and (v[-1] == "#" or v[-1] == "?") :
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309 return create_URIRef(joined + v[-1], check)
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310 else :
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311 return create_URIRef(joined, check)
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312 except :
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313 return create_URIRef(joined, check)
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314
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315 if val == "" :
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316 # The fragment ID must be removed...
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317 return URIRef(self.base)
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318
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319 # fall back on good old traditional URI-s.
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320 # To be on the safe side, let us use the Python libraries
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321 if self.parsedBase[0] == "" :
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322 # base is, in fact, a local file name
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323 # The following call is just to be sure that some pathological cases when
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324 # the ':' _does_ appear in the URI but not in a scheme position is taken
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325 # care of properly...
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326
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327 key = urlsplit(val)[0]
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328 if key == "" :
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329 # relative URI, to be combined with local file name:
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330 return join(self.base, val, check = False)
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331 else :
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332 return create_URIRef(val)
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333 else :
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334 # Trust the python library...
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335 # Well, not quite:-) there is what is, in my view, a bug in the urljoin; in some cases it
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336 # swallows the '#' or '?' character at the end. This is clearly a problem with
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337 # Semantic Web URI-s
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338 return join(self.base, val)
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339 # end _URI
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340
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341 def _CURIEorURI(self, val) :
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342 """Returns a URI for a (safe or not safe) CURIE. In case it is a safe CURIE but the CURIE itself
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343 is not defined, an error message is issued. Otherwise, if it is not a CURIE, it is taken to be a URI
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344 @param val: attribute value to be interpreted
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345 @type val: string
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346 @return: an RDFLib URIRef instance or None
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347 """
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348 if val == "" :
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349 return URIRef(self.base)
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350
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351 safe_curie = False
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352 if val[0] == '[' :
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353 # If a safe CURIE is asked for, a pure URI is not acceptable.
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354 # Is checked below, and that is why the safe_curie flag is necessary
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355 if val[-1] != ']' :
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356 # that is certainly forbidden: an incomplete safe CURIE
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357 self.options.add_warning(err_illegal_safe_CURIE % val, UnresolvablePrefix, node=self.node.nodeName)
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358 return None
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359 else :
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360 val = val[1:-1]
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361 safe_curie = True
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362 # There is a branch here depending on whether we are in 1.1 or 1.0 mode
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363 if self.rdfa_version >= "1.1" :
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364 retval = self.term_or_curie.CURIE_to_URI(val)
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365 if retval == None :
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366 # the value could not be interpreted as a CURIE, ie, it did not produce any valid URI.
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367 # The rule says that then the whole value should be considered as a URI
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368 # except if it was part of a safe CURIE. In that case it should be ignored...
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369 if safe_curie :
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370 self.options.add_warning(err_no_CURIE_in_safe_CURIE % val, UnresolvablePrefix, node=self.node.nodeName)
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371 return None
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372 else :
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373 return self._URI(val)
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374 else :
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375 # there is an unlikely case where the retval is actually a URIRef with a relative URI. Better filter that one out
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376 if isinstance(retval, BNode) == False and urlsplit(str(retval))[0] == "" :
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diff changeset
377 # yep, there is something wrong, a new URIRef has to be created:
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378 return URIRef(self.base+str(retval))
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379 else :
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380 return retval
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381 else :
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382 # in 1.0 mode a CURIE can be considered only in case of a safe CURIE
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383 if safe_curie :
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384 return self.term_or_curie.CURIE_to_URI(val)
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385 else :
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386 return self._URI(val)
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387 # end _CURIEorURI
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388
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389 def _TERMorCURIEorAbsURI(self, val) :
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390 """Returns a URI either for a term or for a CURIE. The value must be an NCNAME to be handled as a term; otherwise
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391 the method falls back on a CURIE or an absolute URI.
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392 @param val: attribute value to be interpreted
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393 @type val: string
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394 @return: an RDFLib URIRef instance or None
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395 """
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396 from . import uri_schemes
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397 # This case excludes the pure base, ie, the empty value
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398 if val == "" :
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399 return None
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400
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401 from .termorcurie import ncname, termname
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402 if termname.match(val) :
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403 # This is a term, must be handled as such...
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404 retval = self.term_or_curie.term_to_URI(val)
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405 if not retval :
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406 self.options.add_warning(err_undefined_terms % val, UnresolvableTerm, node=self.node.nodeName, buggy_value = val)
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407 return None
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408 else :
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409 return retval
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410 else :
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411 # try a CURIE
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412 retval = self.term_or_curie.CURIE_to_URI(val)
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413 if retval :
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414 return retval
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415 elif self.rdfa_version >= "1.1" :
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416 # See if it is an absolute URI
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417 scheme = urlsplit(val)[0]
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418 if scheme == "" :
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419 # bug; there should be no relative URIs here
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420 self.options.add_warning(err_non_legal_CURIE_ref % val, UnresolvablePrefix, node=self.node.nodeName)
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421 return None
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422 else :
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423 if scheme not in uri_schemes :
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424 self.options.add_warning(err_URI_scheme % val.strip(), node=self.node.nodeName)
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425 return URIRef(val)
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426 else :
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427 # rdfa 1.0 case
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428 self.options.add_warning(err_undefined_CURIE % val.strip(), UnresolvablePrefix, node=self.node.nodeName)
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429 return None
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430 # end _TERMorCURIEorAbsURI
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431
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432 # -----------------------------------------------------------------------------------------------
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433
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434 def getURI(self, attr) :
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435 """Get the URI(s) for the attribute. The name of the attribute determines whether the value should be
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436 a pure URI, a CURIE, etc, and whether the return is a single element of a list of those. This is done
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437 using the L{ExecutionContext._resource_type} table.
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438 @param attr: attribute name
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439 @type attr: string
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440 @return: an RDFLib URIRef instance (or None) or a list of those
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441 """
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442 if self.node.hasAttribute(attr) :
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443 val = self.node.getAttribute(attr)
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444 else :
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445 if attr in ExecutionContext._list :
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446 return []
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447 else :
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448 return None
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449
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450 # This may raise an exception if the attr has no key. This, actually,
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451 # should not happen if the code is correct, but it does not harm having it here...
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452 try :
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453 func = ExecutionContext._resource_type[attr]
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454 except :
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455 # Actually, this should not happen...
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456 func = ExecutionContext._URI
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457
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458 if attr in ExecutionContext._list :
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459 # Allows for a list
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460 resources = [ func(self, v.strip()) for v in val.strip().split() if v != None ]
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461 retval = [ r for r in resources if r != None ]
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462 else :
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463 retval = func(self, val.strip())
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464 return retval
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465 # end getURI
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466
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467 def getResource(self, *args) :
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diff changeset
468 """Get single resources from several different attributes. The first one that returns a valid URI wins.
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469 @param args: variable list of attribute names, or a single attribute being a list itself.
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470 @return: an RDFLib URIRef instance (or None) :
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471 """
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472 if len(args) == 0 :
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473 return None
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474 if isinstance(args[0], tuple) or isinstance(args[0], list) :
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475 rargs = args[0]
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476 else :
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477 rargs = args
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478
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479 for resource in rargs :
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480 uri = self.getURI(resource)
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481 if uri != None : return uri
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482 return None
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483
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484 # -----------------------------------------------------------------------------------------------
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485 def reset_list_mapping(self, origin=None) :
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486 """
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487 Reset, ie, create a new empty dictionary for the list mapping.
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488 """
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489 self.list_mapping = ListStructure()
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490 if origin: self.set_list_origin(origin)
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491 self.new_list = True
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492
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493 def list_empty(self) :
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494 """
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495 Checks whether the list is empty.
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496 @return: Boolean
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497 """
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498 return len(self.list_mapping.mapping) == 0
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499
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500 def get_list_props(self) :
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501 """
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502 Return the list of property values in the list structure
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503 @return: list of URIRef
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504 """
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505 return list(self.list_mapping.mapping.keys())
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506
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507 def get_list_value(self,prop) :
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508 """
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509 Return the list of values in the list structure for a specific property
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510 @return: list of RDF nodes
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511 """
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512 return self.list_mapping.mapping[prop]
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513
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514 def set_list_origin(self, origin) :
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515 """
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516 Set the origin of the list, ie, the subject to attach the final list(s) to
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517 @param origin: URIRef
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518 """
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519 self.list_mapping.origin = origin
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520
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521 def get_list_origin(self) :
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522 """
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523 Return the origin of the list, ie, the subject to attach the final list(s) to
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524 @return: URIRef
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525 """
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526 return self.list_mapping.origin
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527
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528 def add_to_list_mapping(self, property, resource) :
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529 """Add a new property-resource on the list mapping structure. The latter is a dictionary of arrays;
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530 if the array does not exist yet, it will be created on the fly.
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531
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532 @param property: the property URI, used as a key in the dictionary
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533 @param resource: the resource to be added to the relevant array in the dictionary. Can be None; this is a dummy
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534 placeholder for C{<span rel="property" inlist>...</span>} constructions that may be filled in by children or siblings; if not
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535 an empty list has to be generated.
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536 """
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537 if property in self.list_mapping.mapping :
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538 if resource != None :
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539 # indeed, if it is None, than it should not override anything
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540 if self.list_mapping.mapping[property] == None :
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541 # replacing a dummy with real content
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542 self.list_mapping.mapping[property] = [ resource ]
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543 else :
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544 self.list_mapping.mapping[property].append(resource)
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545 else :
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546 if resource != None :
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547 self.list_mapping.mapping[property] = [ resource ]
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548 else :
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549 self.list_mapping.mapping[property] = None
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550
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551
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552 ####################