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<h1>Source code for rdflib.plugins.sparql.evaluate</h1><div class="highlight"><pre>
<span class="sd">"""</span>
<span class="sd">These method recursively evaluate the SPARQL Algebra</span>
<span class="sd">evalQuery is the entry-point, it will setup context and</span>
<span class="sd">return the SPARQLResult object</span>
<span class="sd">evalPart is called on each level and will delegate to the right method</span>
<span class="sd">A rdflib.plugins.sparql.sparql.QueryContext is passed along, keeping</span>
<span class="sd">information needed for evaluation</span>
<span class="sd">A list of dicts (solution mappings) is returned, apart from GroupBy which may</span>
<span class="sd">also return a dict of list of dicts</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">collections</span>
<span class="kn">from</span> <span class="nn">rdflib</span> <span class="kn">import</span> <span class="n">Variable</span><span class="p">,</span> <span class="n">Graph</span><span class="p">,</span> <span class="n">BNode</span><span class="p">,</span> <span class="n">URIRef</span><span class="p">,</span> <span class="n">Literal</span>
<span class="kn">from</span> <span class="nn">rdflib.plugins.sparql</span> <span class="kn">import</span> <span class="n">CUSTOM_EVALS</span>
<span class="kn">from</span> <span class="nn">rdflib.plugins.sparql.parserutils</span> <span class="kn">import</span> <span class="n">value</span>
<span class="kn">from</span> <span class="nn">rdflib.plugins.sparql.sparql</span> <span class="kn">import</span> <span class="p">(</span>
<span class="n">QueryContext</span><span class="p">,</span> <span class="n">AlreadyBound</span><span class="p">,</span> <span class="n">FrozenBindings</span><span class="p">,</span> <span class="n">SPARQLError</span><span class="p">)</span>
<span class="kn">from</span> <span class="nn">rdflib.plugins.sparql.evalutils</span> <span class="kn">import</span> <span class="p">(</span>
<span class="n">_filter</span><span class="p">,</span> <span class="n">_eval</span><span class="p">,</span> <span class="n">_join</span><span class="p">,</span> <span class="n">_diff</span><span class="p">,</span> <span class="n">_minus</span><span class="p">,</span> <span class="n">_fillTemplate</span><span class="p">,</span> <span class="n">_ebv</span><span class="p">)</span>
<span class="kn">from</span> <span class="nn">rdflib.plugins.sparql.aggregates</span> <span class="kn">import</span> <span class="n">evalAgg</span>
<div class="viewcode-block" id="evalBGP"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalBGP">[docs]</a><span class="k">def</span> <span class="nf">evalBGP</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">bgp</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A basic graph pattern</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">bgp</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">ctx</span><span class="o">.</span><span class="n">solution</span><span class="p">()</span>
<span class="k">return</span>
<span class="n">s</span><span class="p">,</span> <span class="n">p</span><span class="p">,</span> <span class="n">o</span> <span class="o">=</span> <span class="n">bgp</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">_s</span> <span class="o">=</span> <span class="n">ctx</span><span class="p">[</span><span class="n">s</span><span class="p">]</span>
<span class="n">_p</span> <span class="o">=</span> <span class="n">ctx</span><span class="p">[</span><span class="n">p</span><span class="p">]</span>
<span class="n">_o</span> <span class="o">=</span> <span class="n">ctx</span><span class="p">[</span><span class="n">o</span><span class="p">]</span>
<span class="k">for</span> <span class="n">ss</span><span class="p">,</span> <span class="n">sp</span><span class="p">,</span> <span class="n">so</span> <span class="ow">in</span> <span class="n">ctx</span><span class="o">.</span><span class="n">graph</span><span class="o">.</span><span class="n">triples</span><span class="p">((</span><span class="n">_s</span><span class="p">,</span> <span class="n">_p</span><span class="p">,</span> <span class="n">_o</span><span class="p">)):</span>
<span class="k">if</span> <span class="bp">None</span> <span class="ow">in</span> <span class="p">(</span><span class="n">_s</span><span class="p">,</span> <span class="n">_p</span><span class="p">,</span> <span class="n">_o</span><span class="p">):</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">ctx</span><span class="o">.</span><span class="n">push</span><span class="p">()</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">ctx</span>
<span class="k">if</span> <span class="n">_s</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="n">c</span><span class="p">[</span><span class="n">s</span><span class="p">]</span> <span class="o">=</span> <span class="n">ss</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">if</span> <span class="n">_p</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="n">c</span><span class="p">[</span><span class="n">p</span><span class="p">]</span> <span class="o">=</span> <span class="n">sp</span>
<span class="k">except</span> <span class="n">AlreadyBound</span><span class="p">:</span>
<span class="k">continue</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">if</span> <span class="n">_o</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="n">c</span><span class="p">[</span><span class="n">o</span><span class="p">]</span> <span class="o">=</span> <span class="n">so</span>
<span class="k">except</span> <span class="n">AlreadyBound</span><span class="p">:</span>
<span class="k">continue</span>
<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">evalBGP</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">bgp</span><span class="p">[</span><span class="mi">1</span><span class="p">:]):</span>
<span class="k">yield</span> <span class="n">x</span>
</div>
<div class="viewcode-block" id="evalExtend"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalExtend">[docs]</a><span class="k">def</span> <span class="nf">evalExtend</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">extend</span><span class="p">):</span>
<span class="c"># TODO: Deal with dict returned from evalPart from GROUP BY</span>
<span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">extend</span><span class="o">.</span><span class="n">p</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">e</span> <span class="o">=</span> <span class="n">_eval</span><span class="p">(</span><span class="n">extend</span><span class="o">.</span><span class="n">expr</span><span class="p">,</span> <span class="n">c</span><span class="o">.</span><span class="n">forget</span><span class="p">(</span><span class="n">ctx</span><span class="p">))</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">SPARQLError</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">e</span>
<span class="k">yield</span> <span class="n">c</span><span class="o">.</span><span class="n">merge</span><span class="p">({</span><span class="n">extend</span><span class="o">.</span><span class="n">var</span><span class="p">:</span> <span class="n">e</span><span class="p">})</span>
<span class="k">except</span> <span class="n">SPARQLError</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">c</span>
</div>
<div class="viewcode-block" id="evalLazyJoin"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalLazyJoin">[docs]</a><span class="k">def</span> <span class="nf">evalLazyJoin</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">join</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A lazy join will push the variables bound</span>
<span class="sd"> in the first part to the second part,</span>
<span class="sd"> essentially doing the join implicitly</span>
<span class="sd"> hopefully evaluating much fewer triples</span>
<span class="sd"> """</span>
<span class="k">for</span> <span class="n">a</span> <span class="ow">in</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">join</span><span class="o">.</span><span class="n">p1</span><span class="p">):</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">ctx</span><span class="o">.</span><span class="n">thaw</span><span class="p">(</span><span class="n">a</span><span class="p">)</span>
<span class="k">for</span> <span class="n">b</span> <span class="ow">in</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">join</span><span class="o">.</span><span class="n">p2</span><span class="p">):</span>
<span class="k">yield</span> <span class="n">b</span>
</div>
<div class="viewcode-block" id="evalJoin"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalJoin">[docs]</a><span class="k">def</span> <span class="nf">evalJoin</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">join</span><span class="p">):</span>
<span class="c"># TODO: Deal with dict returned from evalPart from GROUP BY</span>
<span class="c"># only ever for join.p1</span>
<span class="k">if</span> <span class="n">join</span><span class="o">.</span><span class="n">lazy</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalLazyJoin</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">join</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">a</span> <span class="o">=</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">join</span><span class="o">.</span><span class="n">p1</span><span class="p">)</span>
<span class="n">b</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">join</span><span class="o">.</span><span class="n">p2</span><span class="p">))</span>
<span class="k">return</span> <span class="n">_join</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="evalUnion"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalUnion">[docs]</a><span class="k">def</span> <span class="nf">evalUnion</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">union</span><span class="p">):</span>
<span class="n">res</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">union</span><span class="o">.</span><span class="n">p1</span><span class="p">):</span>
<span class="n">res</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
<span class="k">yield</span> <span class="n">x</span>
<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">union</span><span class="o">.</span><span class="n">p2</span><span class="p">):</span>
<span class="k">if</span> <span class="n">x</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">res</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">x</span>
</div>
<div class="viewcode-block" id="evalMinus"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalMinus">[docs]</a><span class="k">def</span> <span class="nf">evalMinus</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">minus</span><span class="p">):</span>
<span class="n">a</span> <span class="o">=</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">minus</span><span class="o">.</span><span class="n">p1</span><span class="p">)</span>
<span class="n">b</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">minus</span><span class="o">.</span><span class="n">p2</span><span class="p">))</span>
<span class="k">return</span> <span class="n">_minus</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="evalLeftJoin"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalLeftJoin">[docs]</a><span class="k">def</span> <span class="nf">evalLeftJoin</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">join</span><span class="p">):</span>
<span class="c"># import pdb; pdb.set_trace()</span>
<span class="k">for</span> <span class="n">a</span> <span class="ow">in</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">join</span><span class="o">.</span><span class="n">p1</span><span class="p">):</span>
<span class="n">ok</span> <span class="o">=</span> <span class="bp">False</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">ctx</span><span class="o">.</span><span class="n">thaw</span><span class="p">(</span><span class="n">a</span><span class="p">)</span>
<span class="k">for</span> <span class="n">b</span> <span class="ow">in</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">join</span><span class="o">.</span><span class="n">p2</span><span class="p">):</span>
<span class="k">if</span> <span class="n">_ebv</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">expr</span><span class="p">,</span> <span class="n">b</span><span class="o">.</span><span class="n">forget</span><span class="p">(</span><span class="n">ctx</span><span class="p">)):</span>
<span class="n">ok</span> <span class="o">=</span> <span class="bp">True</span>
<span class="k">yield</span> <span class="n">b</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">ok</span><span class="p">:</span>
<span class="c"># we've cheated, the ctx above may contain</span>
<span class="c"># vars bound outside our scope</span>
<span class="c"># before we yield a solution without the OPTIONAL part</span>
<span class="c"># check that we would have had no OPTIONAL matches</span>
<span class="c"># even without prior bindings...</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">any</span><span class="p">(</span><span class="n">_ebv</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">expr</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span> <span class="k">for</span> <span class="n">b</span> <span class="ow">in</span>
<span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="o">.</span><span class="n">thaw</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">remember</span><span class="p">(</span><span class="n">join</span><span class="o">.</span><span class="n">p1</span><span class="o">.</span><span class="n">_vars</span><span class="p">)),</span> <span class="n">join</span><span class="o">.</span><span class="n">p2</span><span class="p">)):</span>
<span class="k">yield</span> <span class="n">a</span>
</div>
<div class="viewcode-block" id="evalFilter"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalFilter">[docs]</a><span class="k">def</span> <span class="nf">evalFilter</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">):</span>
<span class="c"># TODO: Deal with dict returned from evalPart!</span>
<span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="o">.</span><span class="n">p</span><span class="p">):</span>
<span class="k">if</span> <span class="n">_ebv</span><span class="p">(</span><span class="n">part</span><span class="o">.</span><span class="n">expr</span><span class="p">,</span> <span class="n">c</span><span class="o">.</span><span class="n">forget</span><span class="p">(</span><span class="n">ctx</span><span class="p">)):</span>
<span class="k">yield</span> <span class="n">c</span>
</div>
<div class="viewcode-block" id="evalGraph"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalGraph">[docs]</a><span class="k">def</span> <span class="nf">evalGraph</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">):</span>
<span class="k">if</span> <span class="n">ctx</span><span class="o">.</span><span class="n">dataset</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span>
<span class="s">"Non-conjunctive-graph doesn't know about "</span> <span class="o">+</span>
<span class="s">"graphs. Try a query without GRAPH."</span><span class="p">)</span>
<span class="n">ctx</span> <span class="o">=</span> <span class="n">ctx</span><span class="o">.</span><span class="n">clone</span><span class="p">()</span>
<span class="n">graph</span> <span class="o">=</span> <span class="n">ctx</span><span class="p">[</span><span class="n">part</span><span class="o">.</span><span class="n">term</span><span class="p">]</span>
<span class="k">if</span> <span class="n">graph</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">for</span> <span class="n">graph</span> <span class="ow">in</span> <span class="n">ctx</span><span class="o">.</span><span class="n">dataset</span><span class="o">.</span><span class="n">contexts</span><span class="p">():</span>
<span class="c"># in SPARQL the default graph is NOT a named graph</span>
<span class="k">if</span> <span class="n">graph</span> <span class="o">==</span> <span class="n">ctx</span><span class="o">.</span><span class="n">dataset</span><span class="o">.</span><span class="n">default_context</span><span class="p">:</span>
<span class="k">continue</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">ctx</span><span class="o">.</span><span class="n">pushGraph</span><span class="p">(</span><span class="n">graph</span><span class="p">)</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">c</span><span class="o">.</span><span class="n">push</span><span class="p">()</span>
<span class="n">graphSolution</span> <span class="o">=</span> <span class="p">[{</span><span class="n">part</span><span class="o">.</span><span class="n">term</span><span class="p">:</span> <span class="n">graph</span><span class="o">.</span><span class="n">identifier</span><span class="p">}]</span>
<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">_join</span><span class="p">(</span><span class="n">evalPart</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">part</span><span class="o">.</span><span class="n">p</span><span class="p">),</span> <span class="n">graphSolution</span><span class="p">):</span>
<span class="k">yield</span> <span class="n">x</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">ctx</span><span class="o">.</span><span class="n">pushGraph</span><span class="p">(</span><span class="n">ctx</span><span class="o">.</span><span class="n">dataset</span><span class="o">.</span><span class="n">get_context</span><span class="p">(</span><span class="n">graph</span><span class="p">))</span>
<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">c</span><span class="p">,</span> <span class="n">part</span><span class="o">.</span><span class="n">p</span><span class="p">):</span>
<span class="k">yield</span> <span class="n">x</span>
</div>
<div class="viewcode-block" id="evalValues"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalValues">[docs]</a><span class="k">def</span> <span class="nf">evalValues</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">):</span>
<span class="k">for</span> <span class="n">r</span> <span class="ow">in</span> <span class="n">part</span><span class="o">.</span><span class="n">p</span><span class="o">.</span><span class="n">res</span><span class="p">:</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">ctx</span><span class="o">.</span><span class="n">push</span><span class="p">()</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">r</span><span class="o">.</span><span class="n">iteritems</span><span class="p">():</span>
<span class="k">if</span> <span class="n">v</span> <span class="o">!=</span> <span class="s">'UNDEF'</span><span class="p">:</span>
<span class="n">c</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> <span class="o">=</span> <span class="n">v</span>
<span class="k">except</span> <span class="n">AlreadyBound</span><span class="p">:</span>
<span class="k">continue</span>
<span class="k">yield</span> <span class="n">c</span><span class="o">.</span><span class="n">solution</span><span class="p">()</span>
</div>
<div class="viewcode-block" id="evalMultiset"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalMultiset">[docs]</a><span class="k">def</span> <span class="nf">evalMultiset</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">):</span>
<span class="k">if</span> <span class="n">part</span><span class="o">.</span><span class="n">p</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'values'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalValues</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">return</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="o">.</span><span class="n">p</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="evalPart"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalPart">[docs]</a><span class="k">def</span> <span class="nf">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">):</span>
<span class="c"># try custom evaluation functions</span>
<span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">CUSTOM_EVALS</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="n">c</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">NotImplementedError</span><span class="p">:</span>
<span class="k">pass</span> <span class="c"># the given custome-function did not handle this part</span>
<span class="k">if</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'BGP'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalBGP</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="o">.</span><span class="n">triples</span><span class="p">)</span> <span class="c"># NOTE pass part.triples, not part!</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'Filter'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalFilter</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'Join'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalJoin</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'LeftJoin'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalLeftJoin</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'Graph'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalGraph</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'Union'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalUnion</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'ToMultiSet'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalMultiset</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'Extend'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalExtend</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'Minus'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalMinus</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'Project'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalProject</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'Slice'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalSlice</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'Distinct'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalDistinct</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'Reduced'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalReduced</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'OrderBy'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalOrderBy</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'Group'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalGroup</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'AggregateJoin'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalAggregateJoin</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'SelectQuery'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalSelectQuery</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'AskQuery'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalAskQuery</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'ConstructQuery'</span><span class="p">:</span>
<span class="k">return</span> <span class="n">evalConstructQuery</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'ServiceGraphPattern'</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span><span class="s">'ServiceGraphPattern not implemented'</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s">'DescribeQuery'</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span><span class="s">'DESCRIBE not implemented'</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="c"># import pdb ; pdb.set_trace()</span>
<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span><span class="s">'I dont know: </span><span class="si">%s</span><span class="s">'</span> <span class="o">%</span> <span class="n">part</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="evalGroup"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalGroup">[docs]</a><span class="k">def</span> <span class="nf">evalGroup</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">group</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> http://www.w3.org/TR/sparql11-query/#defn_algGroup</span>
<span class="sd"> """</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">group</span><span class="o">.</span><span class="n">p</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">group</span><span class="o">.</span><span class="n">expr</span><span class="p">:</span>
<span class="k">return</span> <span class="p">{</span><span class="mi">1</span><span class="p">:</span> <span class="nb">list</span><span class="p">(</span><span class="n">p</span><span class="p">)}</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">collections</span><span class="o">.</span><span class="n">defaultdict</span><span class="p">(</span><span class="nb">list</span><span class="p">)</span>
<span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">p</span><span class="p">:</span>
<span class="n">k</span> <span class="o">=</span> <span class="nb">tuple</span><span class="p">(</span><span class="n">_eval</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">c</span><span class="p">)</span> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">group</span><span class="o">.</span><span class="n">expr</span><span class="p">)</span>
<span class="n">res</span><span class="p">[</span><span class="n">k</span><span class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<span class="k">return</span> <span class="n">res</span>
</div>
<div class="viewcode-block" id="evalAggregateJoin"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalAggregateJoin">[docs]</a><span class="k">def</span> <span class="nf">evalAggregateJoin</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">agg</span><span class="p">):</span>
<span class="c"># import pdb ; pdb.set_trace()</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">agg</span><span class="o">.</span><span class="n">p</span><span class="p">)</span>
<span class="c"># p is always a Group, we always get a dict back</span>
<span class="k">for</span> <span class="n">row</span> <span class="ow">in</span> <span class="n">p</span><span class="p">:</span>
<span class="n">bindings</span> <span class="o">=</span> <span class="p">{}</span>
<span class="k">for</span> <span class="n">a</span> <span class="ow">in</span> <span class="n">agg</span><span class="o">.</span><span class="n">A</span><span class="p">:</span>
<span class="n">evalAgg</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">p</span><span class="p">[</span><span class="n">row</span><span class="p">],</span> <span class="n">bindings</span><span class="p">)</span>
<span class="k">yield</span> <span class="n">FrozenBindings</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">bindings</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">p</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">FrozenBindings</span><span class="p">(</span><span class="n">ctx</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="evalOrderBy"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalOrderBy">[docs]</a><span class="k">def</span> <span class="nf">evalOrderBy</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">):</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="o">.</span><span class="n">p</span><span class="p">)</span>
<span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="nb">reversed</span><span class="p">(</span><span class="n">part</span><span class="o">.</span><span class="n">expr</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">val</span><span class="p">(</span><span class="n">x</span><span class="p">):</span>
<span class="n">v</span> <span class="o">=</span> <span class="n">value</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">e</span><span class="o">.</span><span class="n">expr</span><span class="p">,</span> <span class="n">variables</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">v</span><span class="p">,</span> <span class="n">Variable</span><span class="p">):</span>
<span class="k">return</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">v</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">v</span><span class="p">,</span> <span class="n">BNode</span><span class="p">):</span>
<span class="k">return</span> <span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="n">v</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">v</span><span class="p">,</span> <span class="n">URIRef</span><span class="p">):</span>
<span class="k">return</span> <span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="n">v</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">v</span><span class="p">,</span> <span class="n">Literal</span><span class="p">):</span>
<span class="k">return</span> <span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="n">v</span><span class="p">)</span>
<span class="n">reverse</span> <span class="o">=</span> <span class="nb">bool</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">order</span> <span class="ow">and</span> <span class="n">e</span><span class="o">.</span><span class="n">order</span> <span class="o">==</span> <span class="s">'DESC'</span><span class="p">)</span>
<span class="n">res</span> <span class="o">=</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">res</span><span class="p">,</span> <span class="n">key</span><span class="o">=</span><span class="n">val</span><span class="p">,</span> <span class="n">reverse</span><span class="o">=</span><span class="n">reverse</span><span class="p">)</span>
<span class="k">return</span> <span class="n">res</span>
</div>
<div class="viewcode-block" id="evalSlice"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalSlice">[docs]</a><span class="k">def</span> <span class="nf">evalSlice</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="nb">slice</span><span class="p">):</span>
<span class="c"># import pdb; pdb.set_trace()</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="nb">slice</span><span class="o">.</span><span class="n">p</span><span class="p">)</span>
<span class="n">i</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">while</span> <span class="n">i</span> <span class="o"><</span> <span class="nb">slice</span><span class="o">.</span><span class="n">start</span><span class="p">:</span>
<span class="n">res</span><span class="o">.</span><span class="n">next</span><span class="p">()</span>
<span class="n">i</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="n">i</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">res</span><span class="p">:</span>
<span class="n">i</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">if</span> <span class="nb">slice</span><span class="o">.</span><span class="n">length</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">x</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">if</span> <span class="n">i</span> <span class="o"><=</span> <span class="nb">slice</span><span class="o">.</span><span class="n">length</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">x</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">break</span>
</div>
<div class="viewcode-block" id="evalReduced"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalReduced">[docs]</a><span class="k">def</span> <span class="nf">evalReduced</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">):</span>
<span class="k">return</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="o">.</span><span class="n">p</span><span class="p">)</span> <span class="c"># TODO!</span>
</div>
<div class="viewcode-block" id="evalDistinct"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalDistinct">[docs]</a><span class="k">def</span> <span class="nf">evalDistinct</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="p">):</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">part</span><span class="o">.</span><span class="n">p</span><span class="p">)</span>
<span class="n">done</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">res</span><span class="p">:</span>
<span class="k">if</span> <span class="n">x</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">done</span><span class="p">:</span>
<span class="k">yield</span> <span class="n">x</span>
<span class="n">done</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">x</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="evalProject"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalProject">[docs]</a><span class="k">def</span> <span class="nf">evalProject</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">project</span><span class="p">):</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">project</span><span class="o">.</span><span class="n">p</span><span class="p">)</span>
<span class="k">return</span> <span class="p">(</span><span class="n">row</span><span class="o">.</span><span class="n">project</span><span class="p">(</span><span class="n">project</span><span class="o">.</span><span class="n">PV</span><span class="p">)</span> <span class="k">for</span> <span class="n">row</span> <span class="ow">in</span> <span class="n">res</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="evalSelectQuery"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalSelectQuery">[docs]</a><span class="k">def</span> <span class="nf">evalSelectQuery</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">query</span><span class="p">):</span>
<span class="n">res</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">res</span><span class="p">[</span><span class="s">"type_"</span><span class="p">]</span> <span class="o">=</span> <span class="s">"SELECT"</span>
<span class="n">res</span><span class="p">[</span><span class="s">"bindings"</span><span class="p">]</span> <span class="o">=</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">query</span><span class="o">.</span><span class="n">p</span><span class="p">)</span>
<span class="n">res</span><span class="p">[</span><span class="s">"vars_"</span><span class="p">]</span> <span class="o">=</span> <span class="n">query</span><span class="o">.</span><span class="n">PV</span>
<span class="k">return</span> <span class="n">res</span>
</div>
<div class="viewcode-block" id="evalAskQuery"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalAskQuery">[docs]</a><span class="k">def</span> <span class="nf">evalAskQuery</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">query</span><span class="p">):</span>
<span class="n">res</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">res</span><span class="p">[</span><span class="s">"type_"</span><span class="p">]</span> <span class="o">=</span> <span class="s">"ASK"</span>
<span class="n">res</span><span class="p">[</span><span class="s">"askAnswer"</span><span class="p">]</span> <span class="o">=</span> <span class="bp">False</span>
<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">query</span><span class="o">.</span><span class="n">p</span><span class="p">):</span>
<span class="n">res</span><span class="p">[</span><span class="s">"askAnswer"</span><span class="p">]</span> <span class="o">=</span> <span class="bp">True</span>
<span class="k">break</span>
<span class="k">return</span> <span class="n">res</span>
</div>
<div class="viewcode-block" id="evalConstructQuery"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalConstructQuery">[docs]</a><span class="k">def</span> <span class="nf">evalConstructQuery</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">query</span><span class="p">):</span>
<span class="n">template</span> <span class="o">=</span> <span class="n">query</span><span class="o">.</span><span class="n">template</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">template</span><span class="p">:</span>
<span class="c"># a construct-where query</span>
<span class="n">template</span> <span class="o">=</span> <span class="n">query</span><span class="o">.</span><span class="n">p</span><span class="o">.</span><span class="n">p</span><span class="o">.</span><span class="n">triples</span> <span class="c"># query->project->bgp ...</span>
<span class="n">graph</span> <span class="o">=</span> <span class="n">Graph</span><span class="p">()</span>
<span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">query</span><span class="o">.</span><span class="n">p</span><span class="p">):</span>
<span class="n">graph</span> <span class="o">+=</span> <span class="n">_fillTemplate</span><span class="p">(</span><span class="n">template</span><span class="p">,</span> <span class="n">c</span><span class="p">)</span>
<span class="n">res</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">res</span><span class="p">[</span><span class="s">"type_"</span><span class="p">]</span> <span class="o">=</span> <span class="s">"CONSTRUCT"</span>
<span class="n">res</span><span class="p">[</span><span class="s">"graph"</span><span class="p">]</span> <span class="o">=</span> <span class="n">graph</span>
<span class="k">return</span> <span class="n">res</span>
</div>
<div class="viewcode-block" id="evalQuery"><a class="viewcode-back" href="../../../../apidocs/rdflib.plugins.sparql.html#rdflib.plugins.sparql.evaluate.evalQuery">[docs]</a><span class="k">def</span> <span class="nf">evalQuery</span><span class="p">(</span><span class="n">graph</span><span class="p">,</span> <span class="n">query</span><span class="p">,</span> <span class="n">initBindings</span><span class="p">,</span> <span class="n">base</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="n">ctx</span> <span class="o">=</span> <span class="n">QueryContext</span><span class="p">(</span><span class="n">graph</span><span class="p">)</span>
<span class="n">ctx</span><span class="o">.</span><span class="n">prologue</span> <span class="o">=</span> <span class="n">query</span><span class="o">.</span><span class="n">prologue</span>
<span class="k">if</span> <span class="n">initBindings</span><span class="p">:</span>
<span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">initBindings</span><span class="o">.</span><span class="n">iteritems</span><span class="p">():</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">k</span><span class="p">,</span> <span class="n">Variable</span><span class="p">):</span>
<span class="n">k</span> <span class="o">=</span> <span class="n">Variable</span><span class="p">(</span><span class="n">k</span><span class="p">)</span>
<span class="n">ctx</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> <span class="o">=</span> <span class="n">v</span>
<span class="c"># ctx.push() # nescessary?</span>
<span class="n">main</span> <span class="o">=</span> <span class="n">query</span><span class="o">.</span><span class="n">algebra</span>
<span class="c"># import pdb; pdb.set_trace()</span>
<span class="k">if</span> <span class="n">main</span><span class="o">.</span><span class="n">datasetClause</span><span class="p">:</span>
<span class="k">if</span> <span class="n">ctx</span><span class="o">.</span><span class="n">dataset</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span>
<span class="s">"Non-conjunctive-graph doesn't know about "</span> <span class="o">+</span>
<span class="s">"graphs! Try a query without FROM (NAMED)."</span><span class="p">)</span>
<span class="n">ctx</span> <span class="o">=</span> <span class="n">ctx</span><span class="o">.</span><span class="n">clone</span><span class="p">()</span> <span class="c"># or push/pop?</span>
<span class="n">firstDefault</span> <span class="o">=</span> <span class="bp">False</span>
<span class="k">for</span> <span class="n">d</span> <span class="ow">in</span> <span class="n">main</span><span class="o">.</span><span class="n">datasetClause</span><span class="p">:</span>
<span class="k">if</span> <span class="n">d</span><span class="o">.</span><span class="n">default</span><span class="p">:</span>
<span class="k">if</span> <span class="n">firstDefault</span><span class="p">:</span>
<span class="c"># replace current default graph</span>
<span class="n">dg</span> <span class="o">=</span> <span class="n">ctx</span><span class="o">.</span><span class="n">dataset</span><span class="o">.</span><span class="n">get_context</span><span class="p">(</span><span class="n">BNode</span><span class="p">())</span>
<span class="n">ctx</span> <span class="o">=</span> <span class="n">ctx</span><span class="o">.</span><span class="n">pushGraph</span><span class="p">(</span><span class="n">dg</span><span class="p">)</span>
<span class="n">firstDefault</span> <span class="o">=</span> <span class="bp">True</span>
<span class="n">ctx</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">d</span><span class="o">.</span><span class="n">default</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">d</span><span class="o">.</span><span class="n">named</span><span class="p">:</span>
<span class="n">g</span> <span class="o">=</span> <span class="n">d</span><span class="o">.</span><span class="n">named</span>
<span class="n">ctx</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">g</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
<span class="k">return</span> <span class="n">evalPart</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span> <span class="n">main</span><span class="p">)</span></div>
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