etree: Implement method xml.etree.ElementTree.XMLParser.flush (C version)

Author: hartwork

Modules/_elementtree.c

@@ -3894,6 +3894,34 @@ _elementtree_XMLParser_close_impl(XMLParserObject *self)
     }
 }
 
+/*[clinic input]
+_elementtree.XMLParser.flush
+
+[clinic start generated code]*/
+
+static PyObject *
+_elementtree_XMLParser_flush_impl(XMLParserObject *self)
+/*[clinic end generated code: output=42fdb8795ca24509 input=effbecdb28715949]*/
+{
+    if (!_check_xmlparser(self)) {
+        return NULL;
+    }
+
+    elementtreestate * const st = self->state;
+
+    if (EXPAT(st, SetReparseDeferralEnabled) == NULL) {
+        return NULL;
+    }
+
+    EXPAT(self->state, SetReparseDeferralEnabled)(self->parser, XML_FALSE);
+
+    PyObject* const res = expat_parse(st, self, "", 0, XML_FALSE);
+
+    EXPAT(self->state, SetReparseDeferralEnabled)(self->parser, XML_TRUE);
+
+    return res;
+}
+
 /*[clinic input]
 _elementtree.XMLParser.feed
 
@@ -4288,6 +4316,7 @@ static PyType_Spec treebuilder_spec = {
 static PyMethodDef xmlparser_methods[] = {
     _ELEMENTTREE_XMLPARSER_FEED_METHODDEF
     _ELEMENTTREE_XMLPARSER_CLOSE_METHODDEF
+    _ELEMENTTREE_XMLPARSER_FLUSH_METHODDEF
     _ELEMENTTREE_XMLPARSER__PARSE_WHOLE_METHODDEF
     _ELEMENTTREE_XMLPARSER__SETEVENTS_METHODDEF
     {NULL, NULL}