diff --git a/src/ast.hpp b/src/ast.hpp
new file mode 100644
index 0000000..6c60dc9
--- /dev/null
+++ b/src/ast.hpp
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2018 CESNET, https://photonics.cesnet.cz/
+ *
+ * Written by Václav Kubernát <kubervac@fit.cvut.cz>
+ *
+*/
+#pragma once
+#include <boost/spirit/home/x3.hpp>
+#include <vector>
+#include <boost/spirit/home/x3/support/ast/position_tagged.hpp>
+#include <boost/fusion/adapted/struct/adapt_struct.hpp>
+#include <boost/fusion/include/adapt_struct.hpp>
+#include "CTree.hpp"
+namespace x3 = boost::spirit::x3;
+namespace ascii = boost::spirit::x3::ascii;
+
+using x3::alpha;
+using x3::alnum;
+using x3::lit;
+using x3::char_;
+using x3::_attr;
+using x3::lexeme;
+using ascii::space;
+
+using nodeString = std::string;
+
+struct ParserContext
+{
+    ParserContext(const CTree& tree);
+    const CTree& m_tree;
+    std::string m_currentContext;
+};
+
+struct parser_context_tag;
+
+struct container_
+{
+    char m_first;
+    std::string m_name;
+};
+
+BOOST_FUSION_ADAPT_STRUCT(container_, m_first, m_name)
+
+struct path_
+{
+    std::vector<container_> m_nodes;
+};
+
+BOOST_FUSION_ADAPT_STRUCT(path_, m_nodes)
+
+struct cd_
+{
+    path_ m_path;
+};
+
+BOOST_FUSION_ADAPT_STRUCT(cd_, m_path)
+
+
+struct container_class
+{
+    template <typename T, typename Iterator, typename Context>
+        inline void on_success(Iterator const& first, Iterator const& last
+                , T& ast, Context const& context);
+};
+
+struct path_class
+{
+    template <typename T, typename Iterator, typename Context>
+    inline void on_success(Iterator const& first, Iterator const& last
+    , T& ast, Context const& context);
+};
+
+struct cd_class
+{
+    template <typename T, typename Iterator, typename Context>
+    inline void on_success(Iterator const& first, Iterator const& last
+    , T& ast, Context const& context);
+
+};
+
+
+typedef x3::rule<container_class, container_> container_type;
+typedef x3::rule<path_class, path_> path_type;
+typedef x3::rule<cd_class, cd_> cd_type;
+
+container_type const container = "container";
+path_type const path = "path";
+cd_type const cd = "cd";
+
+
+auto const container_def =
+    lexeme[
+        ((alpha | x3::string("_")) >> *(alnum | x3::string("_") | x3::string("-") | x3::string(".")))
+    ];
+auto const path_def =
+    container % '/';
+
+auto const cd_def =
+    lit("cd") >> path >> x3::eoi;
+
+BOOST_SPIRIT_DEFINE(container)
+BOOST_SPIRIT_DEFINE(path)
+BOOST_SPIRIT_DEFINE(cd)