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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_TOKENISER_HXX
- #define RSPAMD_CSS_TOKENISER_HXX
-
- #include <string_view>
- #include <utility>
- #include <variant>
- #include <list>
- #include <functional>
- #include <cstdint>
- #include "mem_pool.h"
-
- namespace rspamd::css {
-
- struct css_parser_token_placeholder {}; /* For empty tokens */
-
- struct css_parser_token {
-
- enum class token_type : std::uint8_t {
- whitespace_token,
- ident_token,
- function_token,
- at_keyword_token,
- hash_token,
- string_token,
- number_token,
- url_token,
- cdo_token, /* xml open comment */
- cdc_token, /* xml close comment */
- delim_token,
- obrace_token, /* ( */
- ebrace_token, /* ) */
- osqbrace_token, /* [ */
- esqbrace_token, /* ] */
- ocurlbrace_token, /* { */
- ecurlbrace_token, /* } */
- comma_token,
- colon_token,
- semicolon_token,
- eof_token,
- };
-
- enum class dim_type : std::uint8_t {
- dim_px = 0,
- dim_em,
- dim_rem,
- dim_ex,
- dim_wv,
- dim_wh,
- dim_vmax,
- dim_vmin,
- dim_pt,
- dim_cm,
- dim_mm,
- dim_in,
- dim_pc,
- dim_max,
- };
-
- static const std::uint8_t default_flags = 0;
- static const std::uint8_t flag_bad_string = (1u << 0u);
- static const std::uint8_t number_dimension = (1u << 1u);
- static const std::uint8_t number_percent = (1u << 2u);
- static const std::uint8_t flag_bad_dimension = (1u << 3u);
-
- using value_type = std::variant<std::string_view, /* For strings and string like tokens */
- char, /* For delimiters (might need to move to unicode point) */
- float, /* For numeric stuff */
- css_parser_token_placeholder /* For general no token stuff */
- >;
-
- /* Typed storage */
- value_type value;
-
- int lineno;
-
- token_type type;
- std::uint8_t flags = default_flags;
- dim_type dimension_type;
-
- css_parser_token() = delete;
- explicit css_parser_token(token_type type, const value_type &value)
- : value(value), type(type)
- {
- }
- css_parser_token(css_parser_token &&other) = default;
- css_parser_token(const css_parser_token &token) = default;
- auto operator=(css_parser_token &&other) -> css_parser_token & = default;
- auto adjust_dim(const css_parser_token &dim_token) -> bool;
-
- auto get_string_or_default(const std::string_view &def) const -> std::string_view
- {
- if (std::holds_alternative<std::string_view>(value)) {
- return std::get<std::string_view>(value);
- }
- else if (std::holds_alternative<char>(value)) {
- return std::string_view(&std::get<char>(value), 1);
- }
-
- return def;
- }
-
- auto get_delim() const -> char
- {
- if (std::holds_alternative<char>(value)) {
- return std::get<char>(value);
- }
-
- return (char) -1;
- }
-
- auto get_number_or_default(float def) const -> float
- {
- if (std::holds_alternative<float>(value)) {
- auto dbl = std::get<float>(value);
-
- if (flags & css_parser_token::number_percent) {
- dbl /= 100.0;
- }
-
- return dbl;
- }
-
- return def;
- }
-
- auto get_normal_number_or_default(float def) const -> float
- {
- if (std::holds_alternative<float>(value)) {
- auto dbl = std::get<float>(value);
-
- if (flags & css_parser_token::number_percent) {
- dbl /= 100.0;
- }
-
- if (dbl < 0) {
- return 0.0;
- }
- else if (dbl > 1.0) {
- return 1.0;
- }
-
- return dbl;
- }
-
- return def;
- }
-
- /* Debugging routines */
- constexpr auto get_token_type() -> const char *;
- /* This function might be slow */
- auto debug_token_str() -> std::string;
- };
-
- static auto css_parser_eof_token(void) -> const css_parser_token &
- {
- static css_parser_token eof_tok{
- css_parser_token::token_type::eof_token,
- css_parser_token_placeholder()};
-
- return eof_tok;
- }
-
- /* Ensure that parser tokens are simple enough */
- /*
- * compiler must implement P0602 "variant and optional should propagate copy/move triviality"
- * This is broken on gcc < 8!
- */
- static_assert(std::is_trivially_copyable_v<css_parser_token>);
-
- class css_tokeniser {
- public:
- css_tokeniser() = delete;
- css_tokeniser(rspamd_mempool_t *pool, const std::string_view &sv)
- : input(sv), offset(0), pool(pool)
- {
- }
-
- auto next_token(void) -> struct css_parser_token;
- auto pushback_token(const struct css_parser_token &t) const -> void
- {
- backlog.push_back(t);
- }
-
- private:
- std::string_view input;
- std::size_t offset;
- rspamd_mempool_t *pool;
- mutable std::list<css_parser_token> backlog;
-
- auto consume_number() -> struct css_parser_token;
- auto consume_ident(bool allow_number = false) -> struct css_parser_token;
- };
-
- }// namespace rspamd::css
-
-
- #endif//RSPAMD_CSS_TOKENISER_HXX
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