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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_selector.hxx"
#include "css.hxx"
#include "libserver/html/html.hxx"
#include "fmt/core.h"
#define DOCTEST_CONFIG_IMPLEMENTATION_IN_DLL
#include "doctest/doctest.h"
namespace rspamd::css {
auto process_selector_tokens(rspamd_mempool_t *pool,
blocks_gen_functor &&next_token_functor)
-> selectors_vec
{
selectors_vec ret;
bool can_continue = true;
enum class selector_process_state {
selector_parse_start = 0,
selector_expect_ident,
selector_ident_consumed,
selector_ignore_attribute,
selector_ignore_function,
selector_ignore_combination
} state = selector_process_state::selector_parse_start;
std::unique_ptr<css_selector> cur_selector;
while (can_continue) {
const auto &next_tok = next_token_functor();
if (next_tok.tag == css_consumed_block::parser_tag_type::css_component) {
const auto &parser_tok = next_tok.get_token_or_empty();
if (state == selector_process_state::selector_parse_start) {
/*
* At the beginning of the parsing we can expect either
* delim or an ident, everything else is discarded for now
*/
msg_debug_css("start consume selector");
switch (parser_tok.type) {
case css_parser_token::token_type::delim_token: {
auto delim_c = parser_tok.get_delim();
if (delim_c == '.') {
cur_selector = std::make_unique<css_selector>(
css_selector::selector_type::SELECTOR_CLASS);
state = selector_process_state::selector_expect_ident;
}
else if (delim_c == '#') {
cur_selector = std::make_unique<css_selector>(
css_selector::selector_type::SELECTOR_ID);
state = selector_process_state::selector_expect_ident;
}
else if (delim_c == '*') {
cur_selector = std::make_unique<css_selector>(
css_selector::selector_type::SELECTOR_ALL);
state = selector_process_state::selector_ident_consumed;
}
break;
}
case css_parser_token::token_type::ident_token: {
auto tag_id = html::html_tag_by_name(parser_tok.get_string_or_default(""));
if (tag_id) {
cur_selector = std::make_unique<css_selector>(tag_id.value());
}
state = selector_process_state::selector_ident_consumed;
break;
}
case css_parser_token::token_type::hash_token:
cur_selector = std::make_unique<css_selector>(
css_selector::selector_type::SELECTOR_ID);
cur_selector->value =
parser_tok.get_string_or_default("");
state = selector_process_state::selector_ident_consumed;
break;
default:
msg_debug_css("cannot consume more of a selector, invalid parser token: %s; expected start",
next_tok.token_type_str());
can_continue = false;
break;
}
}
else if (state == selector_process_state::selector_expect_ident) {
/*
* We got something like a selector start, so we expect
* a plain ident
*/
if (parser_tok.type == css_parser_token::token_type::ident_token && cur_selector) {
cur_selector->value = parser_tok.get_string_or_default("");
state = selector_process_state::selector_ident_consumed;
}
else {
msg_debug_css("cannot consume more of a selector, invalid parser token: %s; expected ident",
next_tok.token_type_str());
can_continue = false;
}
}
else if (state == selector_process_state::selector_ident_consumed) {
if (parser_tok.type == css_parser_token::token_type::comma_token && cur_selector) {
/* Got full selector, attach it to the vector and go further */
msg_debug_css("attached selector: %s", cur_selector->debug_str().c_str());
ret.push_back(std::move(cur_selector));
state = selector_process_state::selector_parse_start;
}
else if (parser_tok.type == css_parser_token::token_type::semicolon_token) {
/* TODO: implement adjustments */
state = selector_process_state::selector_ignore_function;
}
else if (parser_tok.type == css_parser_token::token_type::osqbrace_token) {
/* TODO: implement attributes checks */
state = selector_process_state::selector_ignore_attribute;
}
else {
/* TODO: implement selectors combinations */
state = selector_process_state::selector_ignore_combination;
}
}
else {
/* Ignore state; ignore all till ',' token or eof token */
if (parser_tok.type == css_parser_token::token_type::comma_token && cur_selector) {
/* Got full selector, attach it to the vector and go further */
ret.push_back(std::move(cur_selector));
state = selector_process_state::selector_parse_start;
}
else {
auto debug_str = parser_tok.get_string_or_default("");
msg_debug_css("ignore token %*s", (int) debug_str.size(),
debug_str.data());
}
}
}
else {
/* End of parsing */
if (state == selector_process_state::selector_ident_consumed && cur_selector) {
msg_debug_css("attached selector: %s", cur_selector->debug_str().c_str());
ret.push_back(std::move(cur_selector));
}
else {
msg_debug_css("not attached selector, state: %d", static_cast<int>(state));
}
can_continue = false;
}
}
return ret; /* copy elision */
}
auto css_selector::debug_str() const -> std::string
{
std::string ret;
if (type == selector_type::SELECTOR_ID) {
ret += "#";
}
else if (type == selector_type::SELECTOR_CLASS) {
ret += ".";
}
else if (type == selector_type::SELECTOR_ALL) {
ret = "*";
return ret;
}
std::visit([&](auto arg) -> void {
using T = std::decay_t<decltype(arg)>;
if constexpr (std::is_same_v<T, tag_id_t>) {
ret += fmt::format("tag: {}", static_cast<int>(arg));
}
else {
ret += arg;
}
},
value);
return ret;
}
TEST_SUITE("css")
{
TEST_CASE("simple css selectors")
{
const std::vector<std::pair<const char *, std::vector<css_selector::selector_type>>> cases{
{"em", {css_selector::selector_type::SELECTOR_TAG}},
{"*", {css_selector::selector_type::SELECTOR_ALL}},
{".class", {css_selector::selector_type::SELECTOR_CLASS}},
{"#id", {css_selector::selector_type::SELECTOR_ID}},
{"em,.class,#id", {css_selector::selector_type::SELECTOR_TAG, css_selector::selector_type::SELECTOR_CLASS, css_selector::selector_type::SELECTOR_ID}},
};
auto *pool = rspamd_mempool_new(rspamd_mempool_suggest_size(),
"css", 0);
for (const auto &c: cases) {
auto res = process_selector_tokens(pool,
get_selectors_parser_functor(pool, c.first));
CHECK(c.second.size() == res.size());
for (auto i = 0; i < c.second.size(); i++) {
CHECK(res[i]->type == c.second[i]);
}
}
rspamd_mempool_delete(pool);
}
}
}// namespace rspamd::css
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