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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_PARSER_HXX
#define RSPAMD_CSS_PARSER_HXX
#include <variant>
#include <vector>
#include <memory>
#include <string>
#include "function2/function2.hpp"
#include "css_tokeniser.hxx"
#include "parse_error.hxx"
#include "contrib/expected/expected.hpp"
#include "logger.h"
/* Forward declaration */
namespace rspamd::html {
struct html_block;
}
namespace rspamd::css {
/*
* Represents a consumed token by a parser
*/
class css_consumed_block {
public:
enum class parser_tag_type : std::uint8_t {
css_top_block = 0,
css_qualified_rule,
css_at_rule,
css_simple_block,
css_function,
css_function_arg,
css_component,
css_eof_block,
};
using consumed_block_ptr = std::unique_ptr<css_consumed_block>;
struct css_function_block {
css_parser_token function;
std::vector<consumed_block_ptr> args;
css_function_block(css_parser_token &&tok)
: function(std::forward<css_parser_token>(tok))
{
}
auto as_string() const -> std::string_view
{
return function.get_string_or_default("");
}
static auto empty_function() -> const css_function_block &
{
static const css_function_block invalid(
css_parser_token(css_parser_token::token_type::eof_token,
css_parser_token_placeholder()));
return invalid;
}
};
css_consumed_block()
: tag(parser_tag_type::css_eof_block)
{
}
css_consumed_block(parser_tag_type tag)
: tag(tag)
{
if (tag == parser_tag_type::css_top_block ||
tag == parser_tag_type::css_qualified_rule ||
tag == parser_tag_type::css_simple_block) {
/* Pre-allocate content for known vector blocks */
std::vector<consumed_block_ptr> vec;
vec.reserve(4);
content = std::move(vec);
}
}
/* Construct a block from a single lexer token (for trivial blocks) */
explicit css_consumed_block(parser_tag_type tag, css_parser_token &&tok)
: tag(tag)
{
if (tag == parser_tag_type::css_function) {
content = css_function_block{std::move(tok)};
}
else {
content = std::move(tok);
}
}
/* Attach a new block to the compound block, consuming block inside */
auto attach_block(consumed_block_ptr &&block) -> bool;
/* Attach a new argument to the compound function block, consuming block inside */
auto add_function_argument(consumed_block_ptr &&block) -> bool;
auto assign_token(css_parser_token &&tok) -> void
{
content = std::move(tok);
}
/* Empty blocks used to avoid type checks in loops */
const inline static std::vector<consumed_block_ptr> empty_block_vec{};
auto is_blocks_vec() const -> bool
{
return (std::holds_alternative<std::vector<consumed_block_ptr>>(content));
}
auto get_blocks_or_empty() const -> const std::vector<consumed_block_ptr> &
{
if (is_blocks_vec()) {
return std::get<std::vector<consumed_block_ptr>>(content);
}
return empty_block_vec;
}
auto is_token() const -> bool
{
return (std::holds_alternative<css_parser_token>(content));
}
auto get_token_or_empty() const -> const css_parser_token &
{
if (is_token()) {
return std::get<css_parser_token>(content);
}
return css_parser_eof_token();
}
auto is_function() const -> bool
{
return (std::holds_alternative<css_function_block>(content));
}
auto get_function_or_invalid() const -> const css_function_block &
{
if (is_function()) {
return std::get<css_function_block>(content);
}
return css_function_block::empty_function();
}
auto size() const -> std::size_t
{
auto ret = 0;
std::visit([&](auto &arg) {
using T = std::decay_t<decltype(arg)>;
if constexpr (std::is_same_v<T, std::vector<consumed_block_ptr>>) {
/* Array of blocks */
ret = arg.size();
}
else if constexpr (std::is_same_v<T, std::monostate>) {
/* Empty block */
ret = 0;
}
else {
/* Single element block */
ret = 1;
}
},
content);
return ret;
}
auto is_eof() -> bool
{
return tag == parser_tag_type::css_eof_block;
}
/* Debug methods */
auto token_type_str(void) const -> const char *;
auto debug_str(void) -> std::string;
public:
parser_tag_type tag;
private:
std::variant<std::monostate,
std::vector<consumed_block_ptr>,
css_parser_token,
css_function_block>
content;
};
extern const css_consumed_block css_parser_eof_block;
using blocks_gen_functor = fu2::unique_function<const css_consumed_block &(void)>;
class css_style_sheet;
/*
* Update the existing stylesheet with another stylesheet
*/
auto parse_css(rspamd_mempool_t *pool, const std::string_view &st,
std::shared_ptr<css_style_sheet> &&other)
-> tl::expected<std::shared_ptr<css_style_sheet>, css_parse_error>;
/*
* Creates a functor to consume css selectors sequence
*/
auto get_selectors_parser_functor(rspamd_mempool_t *pool,
const std::string_view &st) -> blocks_gen_functor;
/*
* Creates a functor to process a rule definition (e.g. from embedded style tag for
* an element)
*/
auto get_rules_parser_functor(rspamd_mempool_t *pool,
const std::string_view &st) -> blocks_gen_functor;
/**
* Parses a css declaration (e.g. embedded css and returns a completed html block)
* @param pool
* @param st
* @return
*/
auto parse_css_declaration(rspamd_mempool_t *pool, const std::string_view &st)
-> rspamd::html::html_block *;
}// namespace rspamd::css
#endif//RSPAMD_CSS_PARSER_HXX
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