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diff --git a/src/libserver/css/css_selector.hxx b/src/libserver/css/css_selector.hxx
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+/*-
+ * Copyright 2021 Vsevolod Stakhov
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#ifndef RSPAMD_CSS_SELECTOR_HXX
+#define RSPAMD_CSS_SELECTOR_HXX
+
+#include <variant>
+#include <string>
+#include <optional>
+#include <vector>
+#include <memory>
+
+#include "function2/function2.hpp"
+#include "parse_error.hxx"
+#include "css_parser.hxx"
+#include "libserver/html/html_tags.h"
+#include "libcryptobox/cryptobox.h"
+
+namespace rspamd::css {
+
+/*
+ * Holds a value for css selector, internal is handled by variant
+ */
+struct css_selector {
+	enum class selector_type {
+		SELECTOR_TAG,   /* e.g. tr, for this value we use tag_id_t */
+		SELECTOR_CLASS, /* generic class, e.g. .class */
+		SELECTOR_ID,    /* e.g. #id */
+		SELECTOR_ALL    /* * selector */
+	};
+
+	selector_type type;
+	std::variant<tag_id_t, std::string_view> value;
+
+	/* Conditions for the css selector */
+	/* Dependency on attributes */
+	struct css_attribute_condition {
+		std::string_view attribute;
+		std::string_view op = "";
+		std::string_view value = "";
+	};
+
+	/* General dependency chain */
+	using css_selector_ptr = std::unique_ptr<css_selector>;
+	using css_selector_dep = std::variant<css_attribute_condition, css_selector_ptr>;
+	std::vector<css_selector_dep> dependencies;
+
+	auto to_tag(void) const -> std::optional<tag_id_t>
+	{
+		if (type == selector_type::SELECTOR_TAG) {
+			return std::get<tag_id_t>(value);
+		}
+		return std::nullopt;
+	}
+
+	auto to_string(void) const -> std::optional<const std::string_view>
+	{
+		if (type != selector_type::SELECTOR_TAG) {
+			return std::string_view(std::get<std::string_view>(value));
+		}
+		return std::nullopt;
+	};
+
+	explicit css_selector(selector_type t)
+		: type(t)
+	{
+	}
+	explicit css_selector(tag_id_t t)
+		: type(selector_type::SELECTOR_TAG)
+	{
+		value = t;
+	}
+	explicit css_selector(const std::string_view &st, selector_type t = selector_type::SELECTOR_ID)
+		: type(t)
+	{
+		value = st;
+	}
+
+	auto operator==(const css_selector &other) const -> bool
+	{
+		return type == other.type && value == other.value;
+	}
+
+	auto debug_str(void) const -> std::string;
+};
+
+
+using selectors_vec = std::vector<std::unique_ptr<css_selector>>;
+
+/*
+ * Consume selectors token and split them to the list of selectors
+ */
+auto process_selector_tokens(rspamd_mempool_t *pool,
+							 blocks_gen_functor &&next_token_functor)
+	-> selectors_vec;
+
+}// namespace rspamd::css
+
+/* Selectors hashing */
+namespace std {
+template<>
+class hash<rspamd::css::css_selector> {
+public:
+	using is_avalanching = void;
+	auto operator()(const rspamd::css::css_selector &sel) const -> std::size_t
+	{
+		if (sel.type == rspamd::css::css_selector::selector_type::SELECTOR_TAG) {
+			return static_cast<std::size_t>(std::get<tag_id_t>(sel.value));
+		}
+		else {
+			const auto &sv = std::get<std::string_view>(sel.value);
+
+			return rspamd_cryptobox_fast_hash(sv.data(), sv.size(), 0xdeadbabe);
+		}
+	}
+};
+}// namespace std
+
+#endif//RSPAMD_CSS_SELECTOR_HXX