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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 "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,
dimension_token,
percentage_token,
cdo_token, /* xml open comment */
cdc_token, /* xml close comment */
delim_token,
obrace_token, /* ( */
ebrace_token, /* ) */
osqbrace_token, /* [ */
esqbrace_token, /* ] */
comma_token,
colon_token,
semicolon_token,
eof_token,
};
static const std::uint8_t default_flags = 0;
static const std::uint8_t flag_bad_string = (1u << 0u);
using value_type = std::variant<std::string_view, /* For strings and string like tokens */
char, /* For delimiters (might need to move to unicode point) */
double, /* For numeric stuff */
css_parser_token_placeholder /* For general no token stuff */
>;
/* Typed storage */
value_type value;
token_type type;
std::uint8_t flags = default_flags;
css_parser_token() = delete;
explicit css_parser_token(token_type type, const value_type &value) :
value(value), type(type) {}
};
/* Ensure that parser tokens are simple enough */
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 get_offset(void) const { return offset; }
private:
std::string_view input;
std::size_t offset;
rspamd_mempool_t *pool;
};
}
#endif //RSPAMD_CSS_TOKENISER_HXX
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