diff --git a/src/grammars.hpp b/src/grammars.hpp
new file mode 100644
index 0000000..45a901f
--- /dev/null
+++ b/src/grammars.hpp
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2018 CESNET, https://photonics.cesnet.cz/
+ * Copyright (C) 2018 FIT CVUT, https://fit.cvut.cz/
+ *
+ * Written by Václav Kubernát <kubervac@fit.cvut.cz>
+ *
+*/
+
+#pragma once
+
+#include "ast.hpp"
+#include "ast_handlers.hpp"
+
+x3::rule<keyValue_class, keyValue_> const keyValue = "keyValue";
+x3::rule<identifier_class, std::string> const identifier = "identifier";
+x3::rule<listPrefix_class, std::string> const listPrefix = "listPrefix";
+x3::rule<listSuffix_class, std::vector<keyValue_>> const listSuffix = "listSuffix";
+x3::rule<listElement_class, listElement_> const listElement = "listElement";
+x3::rule<container_class, container_> const container = "container";
+x3::rule<path_class, path_> const path = "path";
+x3::rule<cd_class, cd_> const cd = "cd";
+
+
+auto const keyValue_def =
+        lexeme[+alnum >> '=' >> +alnum];
+
+auto const identifier_def =
+        lexeme[
+                ((alpha | char_("_")) >> *(alnum | char_("_") | char_("-") | char_(".")))
+        ];
+
+auto const listPrefix_def =
+        identifier >> '[';
+
+auto const listSuffix_def =
+        +keyValue > ']';
+
+auto const listElement_def =
+        listPrefix > listSuffix;
+
+auto const container_def =
+        identifier;
+
+auto const path_def =
+        (container | listElement) % '/';
+
+auto const cd_def =
+        lit("cd") > path >> x3::eoi;
+
+BOOST_SPIRIT_DEFINE(keyValue)
+BOOST_SPIRIT_DEFINE(identifier)
+BOOST_SPIRIT_DEFINE(listPrefix)
+BOOST_SPIRIT_DEFINE(listSuffix)
+BOOST_SPIRIT_DEFINE(listElement)
+BOOST_SPIRIT_DEFINE(container)
+BOOST_SPIRIT_DEFINE(path)
+BOOST_SPIRIT_DEFINE(cd)