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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;
}
/* Selectors hashing */
namespace std {
template<>
class hash<rspamd::css::css_selector> {
public:
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);
}
}
};
}
#endif //RSPAMD_CSS_SELECTOR_HXX
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