Python: introduces QueryBoolean class

python/src/lib.rs

@@ -32,6 +32,7 @@ fn pyoxigraph(_py: Python<'_>, module: &PyModule) -> PyResult<()> {
     module.add_class::<PyVariable>()?;
     module.add_class::<PyQuerySolutions>()?;
     module.add_class::<PyQuerySolution>()?;
+    module.add_class::<PyQueryBoolean>()?;
     module.add_class::<PyQueryTriples>()?;
     io::add_to_module(module)
 }

python/src/sparql.rs

@@ -65,7 +65,7 @@ pub fn query_results_to_python(py: Python<'_>, results: QueryResults) -> PyObjec
     match results {
         QueryResults::Solutions(inner) => PyQuerySolutions { inner }.into_py(py),
         QueryResults::Graph(inner) => PyQueryTriples { inner }.into_py(py),
-        QueryResults::Boolean(b) => b.into_py(py),
+        QueryResults::Boolean(inner) => PyQueryBoolean { inner }.into_py(py),
     }
 }
 
@@ -204,6 +204,38 @@ impl PyQuerySolutions {
     }
 }
 
+/// A boolean returned by a SPARQL ``ASK`` query.
+///
+/// It can be easily casted to a regular boolean using the :py:func:`bool` function.
+///
+/// >>> store = Store()
+/// >>> store.add(Quad(NamedNode('http://example.com'), NamedNode('http://example.com/p'), Literal('1')))
+/// >>> bool(store.query('ASK { ?s ?p ?o }'))
+/// True
+#[pyclass(unsendable, name = "QueryBoolean", module = "pyoxigraph")]
+pub struct PyQueryBoolean {
+    inner: bool,
+}
+
+#[pymethods]
+impl PyQueryBoolean {
+    fn __bool__(&self) -> bool {
+        self.inner
+    }
+
+    fn __richcmp__(&self, other: &Self, op: CompareOp) -> bool {
+        op.matches(self.inner.cmp(&other.inner))
+    }
+
+    fn __hash__(&self) -> u64 {
+        self.inner.into()
+    }
+
+    fn __repr__(&self) -> String {
+        format!("<QueryBoolean {}>", self.inner)
+    }
+}
+
 /// An iterator of :py:class:`Triple` returned by a SPARQL ``CONSTRUCT`` or ``DESCRIBE`` query
 ///
 /// >>> store = Store()

python/src/store.rs

@@ -251,8 +251,8 @@ impl PyStore {
     /// :type default_graph: NamedNode or BlankNode or DefaultGraph or list(NamedNode or BlankNode or DefaultGraph) or None, optional
     /// :param named_graphs: list of the named graphs that could be used in SPARQL `GRAPH` clause. By default, all the store named graphs are available.
     /// :type named_graphs: list(NamedNode or BlankNode) or None, optional
-    /// :return: a :py:class:`bool` for ``ASK`` queries, an iterator of :py:class:`Triple` for ``CONSTRUCT`` and ``DESCRIBE`` queries and an iterator of :py:class:`QuerySolution` for ``SELECT`` queries.
-    /// :rtype: QuerySolutions or QueryTriples or bool
+    /// :return: a :py:class:`QueryBoolean` for ``ASK`` queries, an iterator of :py:class:`Triple` for ``CONSTRUCT`` and ``DESCRIBE`` queries and an iterator of :py:class:`QuerySolution` for ``SELECT`` queries.
+    /// :rtype: QuerySolutions or QueryBoolean or QueryTriples
     /// :raises SyntaxError: if the provided query is invalid.
     /// :raises OSError: if an error happens while reading the store.
     ///
@@ -274,7 +274,7 @@ impl PyStore {
     ///
     /// >>> store = Store()
     /// >>> store.add(Quad(NamedNode('http://example.com'), NamedNode('http://example.com/p'), Literal('1')))
-    /// >>> store.query('ASK { ?s ?p ?o }')
+    /// >>> bool(store.query('ASK { ?s ?p ?o }'))
     /// True
     #[pyo3(signature = (query, *, base_iri = None, use_default_graph_as_union = false, default_graph = None, named_graphs = None))]
     fn query(