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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.
*/
#include "css.h"
#include "css.hxx"
#include "contrib/robin-hood/robin_hood.h"
#include "css_parser.hxx"
/* Keep unit tests implementation here (it'll possibly be moved outside one day) */
#define DOCTEST_CONFIG_IMPLEMENTATION_IN_DLL
#define DOCTEST_CONFIG_IMPLEMENT
#include "doctest/doctest.h"
static void
rspamd_css_dtor(void *p)
{
rspamd::css::css_style_sheet *style =
reinterpret_cast<rspamd::css::css_style_sheet *>(p);
delete style;
}
rspamd_css
rspamd_css_parse_style(rspamd_mempool_t *pool, const guchar *begin, gsize len,
GError **err)
{
auto parse_res = rspamd::css::parse_css(pool, {(const char* )begin, len});
if (parse_res.has_value()) {
/*
* Detach style pointer from the unique_ptr as it will be managed by
* C memory pool
*/
auto *detached_style = reinterpret_cast<rspamd_css>(parse_res.value().release());
rspamd_mempool_add_destructor(pool, rspamd_css_dtor, (void *)detached_style);
return detached_style;
}
else {
g_set_error(err, g_quark_from_static_string("css"),
static_cast<int>(parse_res.error().type),
"parse error");
return nullptr;
}
}
namespace rspamd::css {
INIT_LOG_MODULE_PUBLIC(css);
class css_style_sheet::impl {
public:
using selector_ptr = std::unique_ptr<css_selector>;
using selectors_hash = robin_hood::unordered_flat_map<selector_ptr, css_declarations_block_ptr>;
using universal_selector_t = std::pair<selector_ptr, css_declarations_block_ptr>;
selectors_hash tags_selector;
selectors_hash class_selectors;
selectors_hash id_selectors;
std::optional<universal_selector_t> universal_selector;
};
css_style_sheet::css_style_sheet(rspamd_mempool_t *pool)
: pool(pool), pimpl(new impl) {}
css_style_sheet::~css_style_sheet() {}
auto
css_style_sheet::add_selector_rule(std::unique_ptr<css_selector> &&selector,
css_declarations_block_ptr decls) -> void
{
impl::selectors_hash *target_hash = nullptr;
switch(selector->type) {
case css_selector::selector_type::SELECTOR_ALL:
if (pimpl->universal_selector) {
/* Another universal selector */
msg_debug_css("redefined universal selector, merging rules");
pimpl->universal_selector->second->merge_block(*decls);
}
else {
msg_debug_css("added universal selector");
pimpl->universal_selector = std::make_pair(std::move(selector),
decls);
}
break;
case css_selector::selector_type::SELECTOR_CLASS:
target_hash = &pimpl->class_selectors;
break;
case css_selector::selector_type::SELECTOR_ID:
target_hash = &pimpl->id_selectors;
break;
case css_selector::selector_type::SELECTOR_ELEMENT:
target_hash = &pimpl->tags_selector;
break;
}
if (target_hash) {
auto found_it = target_hash->find(selector);
if (found_it == target_hash->end()) {
/* Easy case, new element */
target_hash->insert({std::move(selector), decls});
}
else {
/* The problem with merging is actually in how to handle selectors chains
* For example, we have 2 selectors:
* 1. class id tag -> meaning that we first match class, then we ensure that
* id is also the same and finally we check the tag
* 2. tag class id -> it means that we check first tag, then class and then id
* So we have somehow equal path in the xpath terms.
* I suppose now, that we merely check parent stuff and handle duplicates
* merging when finally resolving paths.
*/
auto sel_str = selector->to_string().value_or("unknown");
msg_debug_css("found duplicate selector: %*s", (int)sel_str.size(),
sel_str.data());
found_it->second->merge_block(*decls);
}
}
}
}
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