lib/expat/ExpatParser: add constructor overload for XML_ParserCreateNS()

src/lib/expat/ExpatParser.hxx

@@ -38,6 +38,10 @@ public:
 		:ExpatError(XML_GetErrorCode(parser)) {}
 };
 
+struct ExpatNamespaceSeparator {
+	char separator;
+};
+
 class ExpatParser final {
 	const XML_Parser parser;
 
@@ -47,6 +51,11 @@ public:
 		XML_SetUserData(parser, userData);
 	}
 
+	ExpatParser(ExpatNamespaceSeparator ns, void *userData)
+		:parser(XML_ParserCreateNS(nullptr, ns.separator)) {
+		XML_SetUserData(parser, userData);
+	}
+
 	~ExpatParser() {
 		XML_ParserFree(parser);
 	}
@@ -89,6 +98,12 @@ public:
 		parser.SetCharacterDataHandler(CharacterData);
 	}
 
+	explicit CommonExpatParser(ExpatNamespaceSeparator ns)
+		:parser(ns, this) {
+		parser.SetElementHandler(StartElement, EndElement);
+		parser.SetCharacterDataHandler(CharacterData);
+	}
+
 	void Parse(const char *data, size_t length, bool is_final) {
 		parser.Parse(data, length, is_final);
 	}