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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_rule.hxx"
namespace rspamd::css {
static auto
allowed_property_value(const css_property &prop, const css_consumed_block &parser_block)
-> std::optional<css_value>
{
if (prop.is_color()) {
if (parser_block.is_token()) {
/* A single token */
const auto &tok = parser_block.get_token_or_empty();
if (tok.type == css_parser_token::token_type::hash_token) {
return css_value::maybe_color_from_hex(tok.get_string_or_default(""));
}
else if (tok.type == css_parser_token::token_type::ident_token) {
return css_value::maybe_color_from_string(tok.get_string_or_default(""));
}
}
else if (parser_block.is_function()) {
const auto &func = parser_block.get_function_or_invalid();
return css_value::maybe_color_from_function(func);
}
}
else if (prop.is_dimension()) {
if (parser_block.is_token()) {
/* A single token */
const auto &tok = parser_block.get_token_or_empty();
if (tok.type == css_parser_token::token_type::number_token) {
return css_value{tok.get_number_or_default(0)};
}
}
}
else if (prop.is_normal_number()) {
if (parser_block.is_token()) {
/* A single token */
const auto &tok = parser_block.get_token_or_empty();
if (tok.type == css_parser_token::token_type::number_token) {
return css_value{tok.get_normal_number_or_default(0)};
}
}
}
return std::nullopt;
}
auto process_declaration_tokens(rspamd_mempool_t *pool,
const blocks_gen_functor &next_block_functor)
-> declarations_vec
{
declarations_vec ret;
bool can_continue = true;
css_property cur_property{css_property_type::PROPERTY_NYI,
css_property_flag::FLAG_NORMAL};
static const css_property bad_property{css_property_type::PROPERTY_NYI,
css_property_flag::FLAG_NORMAL};
std::unique_ptr<css_rule> cur_rule;
enum {
parse_property,
parse_value,
ignore_value, /* For unknown properties */
} state = parse_property;
auto seen_not = false;
while (can_continue) {
const auto &next_tok = next_block_functor();
switch (next_tok.tag) {
case css_consumed_block::parser_tag_type::css_component:
/* Component can be a property or a compound list of values */
if (state == parse_property) {
cur_property = css_property::from_token(next_tok.get_token_or_empty())
.value_or(bad_property);
if (cur_property.type == css_property_type::PROPERTY_NYI) {
state = ignore_value;
/* Ignore everything till ; */
continue;
}
msg_debug_css("got css property: %s", cur_property.to_string());
/* We now expect colon block */
const auto &expect_colon_block = next_block_functor();
if (expect_colon_block.tag != css_consumed_block::parser_tag_type::css_component) {
state = ignore_value; /* Ignore up to the next rule */
}
else {
const auto &expect_colon_tok = expect_colon_block.get_token_or_empty();
if (expect_colon_tok.type != css_parser_token::token_type::colon_token) {
msg_debug_css("invalid rule, no colon after property");
state = ignore_value; /* Ignore up to the next rule */
}
else {
state = parse_value;
cur_rule = std::make_unique<css_rule>(cur_property);
}
}
}
else if (state == parse_value) {
/* Check semicolon */
if (next_tok.is_token()) {
const auto &parser_tok = next_tok.get_token_or_empty();
if (parser_tok.type == css_parser_token::token_type::semicolon_token) {
ret.push_back(std::move(cur_rule));
state = parse_property;
seen_not = false;
continue;
}
else if (parser_tok.type == css_parser_token::token_type::delim_token) {
if (parser_tok.get_string_or_default("") == "!") {
/* Probably something like !important */
seen_not = true;
}
}
else if (parser_tok.type == css_parser_token::token_type::ident_token) {
if (parser_tok.get_string_or_default("") == "important") {
if (seen_not) {
msg_debug_css("add !important flag to property %s",
cur_property.to_string());
cur_property.flag = css_property_flag::FLAG_NOT_IMPORTANT;
}
else {
msg_debug_css("add important flag to property %s",
cur_property.to_string());
cur_property.flag = css_property_flag::FLAG_IMPORTANT;
}
seen_not = false;
continue;
}
else {
seen_not = false;
}
}
}
auto maybe_value = allowed_property_value(cur_property, next_tok);
if (maybe_value) {
msg_debug_css("added value %s to the property %s",
maybe_value.value().debug_str().c_str(),
cur_property.to_string());
cur_rule->add_value(maybe_value.value());
}
}
else {
/* Ignore all till ; */
if (next_tok.is_token()) {
const auto &parser_tok = next_tok.get_token_or_empty();
if (parser_tok.type == css_parser_token::token_type::semicolon_token) {
state = parse_property;
}
}
}
break;
case css_consumed_block::parser_tag_type::css_function:
if (state == parse_value) {
auto maybe_value = allowed_property_value(cur_property, next_tok);
if (maybe_value) {
msg_debug_css("added value %s to the property %s",
maybe_value.value().debug_str().c_str(),
cur_property.to_string());
cur_rule->add_value(maybe_value.value());
}
}
break;
case css_consumed_block::parser_tag_type::css_eof_block:
if (state == parse_value) {
ret.push_back(std::move(cur_rule));
}
can_continue = false;
break;
default:
can_continue = false;
break;
}
}
return ret; /* copy elision */
}
void css_rule::add_value(std::unique_ptr<css_value> &&value)
{
values.emplace_back(std::forward<std::unique_ptr<css_value>>(value));
}
void css_rule::add_value(const css_value &value)
{
values.emplace_back(std::make_unique<css_value>(css_value{value}));
}
}
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