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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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