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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_RULE_HXX
#define RSPAMD_CSS_RULE_HXX
#include "css_value.hxx"
#include "css_property.hxx"
#include "css_parser.hxx"
#include "contrib/ankerl/unordered_dense.h"
#include "libutil/cxx/util.hxx"
#include "libutil/cxx/hash_util.hxx"
#include <vector>
#include <memory>
namespace rspamd::html {
/* Forward declaration */
struct html_block;
}// namespace rspamd::html
namespace rspamd::css {
class css_rule {
css_property prop;
using css_values_vec = std::vector<css_value>;
css_values_vec values;
public:
/* We must create css rule explicitly from a property and values */
css_rule() = delete;
css_rule(const css_rule &other) = delete;
/* Constructors */
css_rule(css_rule &&other) noexcept = default;
explicit css_rule(css_property &&prop, css_values_vec &&values) noexcept
: prop(prop), values(std::forward<css_values_vec>(values))
{
}
explicit css_rule(const css_property &prop) noexcept
: prop(prop), values{}
{
}
/* Methods */
/* Comparison is special, as we care merely about property, not the values */
auto operator==(const css_rule &other) const
{
return prop == other.prop;
}
constexpr const css_values_vec &get_values(void) const
{
return values;
}
constexpr const css_property &get_prop(void) const
{
return prop;
}
/* Import values from another rules according to the importance */
void override_values(const css_rule &other);
void merge_values(const css_rule &other);
void add_value(const css_value &value);
};
}// namespace rspamd::css
/* Make rules hashable by property */
namespace std {
template<>
class hash<rspamd::css::css_rule> {
public:
using is_avalanching = void;
constexpr auto operator()(const rspamd::css::css_rule &rule) const -> auto
{
return hash<rspamd::css::css_property>()(rule.get_prop());
}
};
}// namespace std
namespace rspamd::css {
/**
* Class that is designed to hold css declaration (a set of rules)
*/
class css_declarations_block {
public:
using rule_shared_ptr = std::shared_ptr<css_rule>;
using rule_shared_hash = smart_ptr_hash<css_rule>;
using rule_shared_eq = smart_ptr_equal<css_rule>;
enum class merge_type {
merge_duplicate,
merge_parent,
merge_override
};
css_declarations_block() = default;
auto add_rule(rule_shared_ptr rule) -> bool;
auto merge_block(const css_declarations_block &other,
merge_type how = merge_type::merge_duplicate) -> void;
auto get_rules(void) const -> const auto &
{
return rules;
}
/**
* Returns if a declaration block has some property
* @param prop
* @return
*/
auto has_property(const css_property &prop) const -> bool
{
return (rules.find(css_rule{prop}) != rules.end());
}
/**
* Compile CSS declaration to the html block
* @param pool used to carry memory required for html_block
* @return html block structure
*/
auto compile_to_block(rspamd_mempool_t *pool) const -> rspamd::html::html_block *;
private:
ankerl::unordered_dense::set<rule_shared_ptr, rule_shared_hash, rule_shared_eq> rules;
};
using css_declarations_block_ptr = std::shared_ptr<css_declarations_block>;
auto process_declaration_tokens(rspamd_mempool_t *pool,
blocks_gen_functor &&next_token_functor)
-> css_declarations_block_ptr;
}// namespace rspamd::css
#endif//RSPAMD_CSS_RULE_HXX
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