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<h1>Source code for rdflib.plugins.parsers.pyRdfa.embeddedRDF</h1><div class="highlight"><pre>
<span class="c"># -*- coding: utf-8 -*-</span>
<span class="sd">"""</span>
<span class="sd">Extracting possible embedded RDF/XML content from the file and parse it separately into the Graph. This is used, for example</span>
<span class="sd">by U{SVG 1.2 Tiny<http://www.w3.org/TR/SVGMobile12/>}.</span>
<span class="sd">@author: U{Ivan Herman<a href="http://www.w3.org/People/Ivan/">}</span>
<span class="sd">@license: This software is available for use under the</span>
<span class="sd">U{W3C® SOFTWARE NOTICE AND LICENSE<href="http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231">}</span>
<span class="sd">@contact: Ivan Herman, ivan@w3.org</span>
<span class="sd">@version: $Id: embeddedRDF.py,v 1.15 2012/11/16 17:51:53 ivan Exp $</span>
<span class="sd">"""</span>
<span class="c"># Python 3 foolproof way...</span>
<span class="k">try</span> <span class="p">:</span>
<span class="kn">from</span> <span class="nn">io</span> <span class="kn">import</span> <span class="n">StringIO</span>
<span class="k">except</span> <span class="p">:</span>
<span class="kn">from</span> <span class="nn">StringIO</span> <span class="kn">import</span> <span class="n">StringIO</span>
<span class="kn">from</span> <span class="nn">.host</span> <span class="kn">import</span> <span class="n">HostLanguage</span><span class="p">,</span> <span class="n">accept_embedded_rdf_xml</span><span class="p">,</span> <span class="n">accept_embedded_turtle</span>
<span class="kn">from</span> <span class="nn">.utils</span> <span class="kn">import</span> <span class="n">return_XML</span>
<span class="kn">import</span> <span class="nn">re</span><span class="o">,</span> <span class="nn">sys</span>
<div class="viewcode-block" id="handle_embeddedRDF"><a class="viewcode-back" href="../../../../../apidocs/rdflib.plugins.parsers.pyRdfa.html#rdflib.plugins.parsers.pyRdfa.embeddedRDF.handle_embeddedRDF">[docs]</a><span class="k">def</span> <span class="nf">handle_embeddedRDF</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">graph</span><span class="p">,</span> <span class="n">state</span><span class="p">)</span> <span class="p">:</span>
<span class="sd">"""</span>
<span class="sd"> Handles embedded RDF. There are two possibilities:</span>
<span class="sd"> </span>
<span class="sd"> - the file is one of the XML dialects that allows for an embedded RDF/XML portion. See the L{host.accept_embedded_rdf_xml} for those (a typical example is SVG). </span>
<span class="sd"> - the file is HTML and there is a turtle portion in the C{<script>} element with type text/turtle. </span>
<span class="sd"> </span>
<span class="sd"> @param node: a DOM node for the top level element</span>
<span class="sd"> @param graph: target rdf graph</span>
<span class="sd"> @type graph: RDFLib's Graph object instance</span>
<span class="sd"> @param state: the inherited state (namespaces, lang, etc)</span>
<span class="sd"> @type state: L{state.ExecutionContext}</span>
<span class="sd"> @return: whether an RDF/XML or turtle content has been detected or not. If TRUE, the RDFa processing should not occur on the node and its descendents. </span>
<span class="sd"> @rtype: Boolean</span>
<span class="sd"> """</span>
<span class="c">#def _get_prefixes_in_turtle() :</span>
<span class="c"># retval = ""</span>
<span class="c"># for key in state.term_or_curie.ns :</span>
<span class="c"># retval += "@prefix %s: <%s> .\n" % (key, state.term_or_curie.ns[key])</span>
<span class="c"># retval += '\n'</span>
<span class="c"># return retval</span>
<span class="c"># This feature is optional!</span>
<span class="k">def</span> <span class="nf">_get_literal</span><span class="p">(</span><span class="n">Pnode</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Get the full text</span>
<span class="sd"> @param Pnode: DOM Node</span>
<span class="sd"> @return: string</span>
<span class="sd"> """</span>
<span class="n">rc</span> <span class="o">=</span> <span class="s">""</span>
<span class="k">for</span> <span class="n">node</span> <span class="ow">in</span> <span class="n">Pnode</span><span class="o">.</span><span class="n">childNodes</span><span class="p">:</span>
<span class="k">if</span> <span class="n">node</span><span class="o">.</span><span class="n">nodeType</span> <span class="ow">in</span> <span class="p">[</span><span class="n">node</span><span class="o">.</span><span class="n">TEXT_NODE</span><span class="p">,</span> <span class="n">node</span><span class="o">.</span><span class="n">CDATA_SECTION_NODE</span><span class="p">]</span> <span class="p">:</span>
<span class="n">rc</span> <span class="o">=</span> <span class="n">rc</span> <span class="o">+</span> <span class="n">node</span><span class="o">.</span><span class="n">data</span>
<span class="c"># Sigh... the HTML5 parser does not recognize the CDATA escapes, ie, it just passes on the <![CDATA[ and ]]> strings:-(</span>
<span class="k">return</span> <span class="n">rc</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s">"<![CDATA["</span><span class="p">,</span><span class="s">""</span><span class="p">)</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s">"]]>"</span><span class="p">,</span><span class="s">""</span><span class="p">)</span>
<span class="k">if</span> <span class="n">state</span><span class="o">.</span><span class="n">options</span><span class="o">.</span><span class="n">embedded_rdf</span> <span class="p">:</span>
<span class="c"># Embedded turtle, per the latest Turtle draft</span>
<span class="k">if</span> <span class="n">state</span><span class="o">.</span><span class="n">options</span><span class="o">.</span><span class="n">host_language</span> <span class="ow">in</span> <span class="n">accept_embedded_turtle</span> <span class="ow">and</span> <span class="n">node</span><span class="o">.</span><span class="n">nodeName</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span> <span class="o">==</span> <span class="s">"script"</span> <span class="p">:</span>
<span class="k">if</span> <span class="n">node</span><span class="o">.</span><span class="n">hasAttribute</span><span class="p">(</span><span class="s">"type"</span><span class="p">)</span> <span class="ow">and</span> <span class="n">node</span><span class="o">.</span><span class="n">getAttribute</span><span class="p">(</span><span class="s">"type"</span><span class="p">)</span> <span class="o">==</span> <span class="s">"text/turtle"</span> <span class="p">:</span>
<span class="c">#prefixes = _get_prefixes_in_turtle()</span>
<span class="c">#content = _get_literal(node)</span>
<span class="c">#rdf = StringIO(prefixes + content)</span>
<span class="n">content</span> <span class="o">=</span> <span class="n">_get_literal</span><span class="p">(</span><span class="n">node</span><span class="p">)</span>
<span class="n">rdf</span> <span class="o">=</span> <span class="n">StringIO</span><span class="p">(</span><span class="n">content</span><span class="p">)</span>
<span class="k">try</span> <span class="p">:</span>
<span class="n">graph</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="n">rdf</span><span class="p">,</span> <span class="n">format</span><span class="o">=</span><span class="s">"n3"</span><span class="p">,</span> <span class="n">publicID</span> <span class="o">=</span> <span class="n">state</span><span class="o">.</span><span class="n">base</span><span class="p">)</span>
<span class="n">state</span><span class="o">.</span><span class="n">options</span><span class="o">.</span><span class="n">add_info</span><span class="p">(</span><span class="s">"The output graph includes triples coming from an embedded Turtle script"</span><span class="p">)</span>
<span class="k">except</span> <span class="p">:</span>
<span class="p">(</span><span class="nb">type</span><span class="p">,</span><span class="n">value</span><span class="p">,</span><span class="n">traceback</span><span class="p">)</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()</span>
<span class="n">state</span><span class="o">.</span><span class="n">options</span><span class="o">.</span><span class="n">add_error</span><span class="p">(</span><span class="s">"Embedded Turtle content could not be parsed (problems with </span><span class="si">%s</span><span class="s">?); ignored"</span> <span class="o">%</span> <span class="n">value</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">True</span>
<span class="k">elif</span> <span class="n">state</span><span class="o">.</span><span class="n">options</span><span class="o">.</span><span class="n">host_language</span> <span class="ow">in</span> <span class="n">accept_embedded_rdf_xml</span> <span class="ow">and</span> <span class="n">node</span><span class="o">.</span><span class="n">localName</span> <span class="o">==</span> <span class="s">"RDF"</span> <span class="ow">and</span> <span class="n">node</span><span class="o">.</span><span class="n">namespaceURI</span> <span class="o">==</span> <span class="s">"http://www.w3.org/1999/02/22-rdf-syntax-ns#"</span> <span class="p">:</span>
<span class="n">rdf</span> <span class="o">=</span> <span class="n">StringIO</span><span class="p">(</span><span class="n">return_XML</span><span class="p">(</span><span class="n">state</span><span class="p">,</span> <span class="n">node</span><span class="p">))</span>
<span class="k">try</span> <span class="p">:</span>
<span class="n">graph</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="n">rdf</span><span class="p">)</span>
<span class="n">state</span><span class="o">.</span><span class="n">options</span><span class="o">.</span><span class="n">add_info</span><span class="p">(</span><span class="s">"The output graph includes triples coming from an embedded RDF/XML subtree"</span><span class="p">)</span>
<span class="k">except</span> <span class="p">:</span>
<span class="p">(</span><span class="nb">type</span><span class="p">,</span><span class="n">value</span><span class="p">,</span><span class="n">traceback</span><span class="p">)</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()</span>
<span class="n">state</span><span class="o">.</span><span class="n">options</span><span class="o">.</span><span class="n">add_error</span><span class="p">(</span><span class="s">"Embedded RDF/XML content could not parsed (problems with </span><span class="si">%s</span><span class="s">?); ignored"</span> <span class="o">%</span> <span class="n">value</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">True</span>
<span class="k">else</span> <span class="p">:</span>
<span class="k">return</span> <span class="bp">False</span>
<span class="k">else</span> <span class="p">:</span>
<span class="k">return</span> <span class="bp">False</span>
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