diff --git a/src/common_parsers.hpp b/src/common_parsers.hpp
index bab3886..eac8e61 100644
--- a/src/common_parsers.hpp
+++ b/src/common_parsers.hpp
@@ -11,6 +11,13 @@
 x3::rule<module_identifier_class, std::string> const module_identifier = "module_identifier";
 x3::rule<module_class, module_> const module = "module";
 x3::rule<node_identifier_class, std::string> const node_identifier = "node_identifier";
+x3::rule<space_separator_class, x3::unused_type> const space_separator = "a space";
+x3::rule<completing_class, x3::unused_type> const completing = "completing";
+
+// This is a pseudo-parser, that fails if we're not completing a command
+auto const completing_def =
+    x3::no_skip[x3::eps];
+
 auto const node_identifier_def =
     x3::lexeme[
             ((x3::alpha | x3::char_("_")) >> *(x3::alnum | x3::char_("_") | x3::char_("-") | x3::char_(".")))
@@ -24,6 +31,11 @@
             ((x3::alpha | x3::char_("_")) >> *(x3::alnum | x3::char_("_") | x3::char_("-") | x3::char_(".")))
     ];
 
+auto const space_separator_def =
+    x3::omit[x3::no_skip[x3::space]];
+
 BOOST_SPIRIT_DEFINE(node_identifier)
 BOOST_SPIRIT_DEFINE(module)
 BOOST_SPIRIT_DEFINE(module_identifier)
+BOOST_SPIRIT_DEFINE(space_separator)
+BOOST_SPIRIT_DEFINE(completing)