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/*
* Ricochet - A minimalist CLI web browser for fast, distraction-free navigation.
* Copyright (C) 2026 Richard Qin
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "ricochet/render/utils.hh"
#include <array>
#include <cstdint>
#include <stdexcept>
namespace ricochet::render {
std::string decode_entities( std::string text )
{
constexpr std::array<std::pair<std::string_view, std::string_view>, 25> entities
= { { { " ", " " }, { "<", "<" }, { ">", ">" }, { "&", "&" }, { """, "\"" },
{ "'", "'" }, { "©", "©" }, { "®", "®" }, { "™", "™" }, { "€", "€" },
{ "£", "£" }, { "¥", "¥" }, { "¢", "¢" }, { "§", "§" }, { "¶", "¶" },
{ "…", "…" }, { "†", "†" }, { "‡", "‡" }, { "•", "•" }, { "′", "′" },
{ "″", "″" }, { "‹", "‹" }, { "›", "›" }, { "‾", "‾" }, { "⁄", "⁄" } } };
for ( const auto& [entity, replacement] : entities ) {
std::size_t pos = 0;
while ( ( pos = text.find( entity, pos ) ) != std::string::npos ) {
text.replace( pos, entity.length(), replacement );
pos += replacement.length();
}
}
std::size_t pos = 0;
while ( ( pos = text.find( "&#", pos ) ) != std::string::npos ) {
const std::size_t end = text.find( ';', pos );
if ( end != std::string::npos && end - pos < 10 ) {
const std::string code = text.substr( pos + 2, end - pos - 2 );
try {
std::uint32_t cp = 0;
if ( !code.empty() && ( code[0] == 'x' || code[0] == 'X' ) ) {
cp = std::stoul( code.substr( 1 ), nullptr, 16 );
} else {
cp = std::stoul( code );
}
if ( cp < 128 ) {
text.replace( pos, end - pos + 1, 1, static_cast<char>( cp ) );
continue;
}
} catch ( const std::invalid_argument& ) {
(void)0;
} catch ( const std::out_of_range& ) {
(void)0;
}
}
pos++;
}
return text;
}
std::string extract_attr( const std::string& tag_name, std::string_view attr_name )
{
std::string match = " " + std::string( attr_name ) + "=";
std::size_t pos = tag_name.find( match );
if ( pos == std::string::npos ) {
match = std::string( attr_name ) + "=";
if ( !tag_name.starts_with( match ) ) {
return "";
}
pos = 0;
} else {
pos += 1;
}
pos += attr_name.length() + 1;
if ( pos >= tag_name.length() ) {
return "";
}
const char quote = tag_name[pos];
if ( quote == '"' || quote == '\'' ) {
const std::size_t end = tag_name.find( quote, pos + 1 );
if ( end != std::string::npos ) {
return tag_name.substr( pos + 1, end - pos - 1 );
}
return "";
}
const std::size_t end = tag_name.find_first_of( " >/", pos );
return tag_name.substr( pos, ( end == std::string::npos ) ? std::string::npos : end - pos );
}
std::size_t get_visible_length( std::string_view str )
{
std::size_t len = 0;
bool in_ansi = false;
for ( std::size_t i = 0; i < str.length(); ++i ) {
const auto c = static_cast<unsigned char>( str[i] );
if ( c == 0x1B ) {
in_ansi = true;
} else if ( in_ansi && c == 'm' ) {
in_ansi = false;
} else if ( !in_ansi ) {
if ( ( c & 0x80 ) == 0 || ( c & 0xE0 ) == 0xC0 ) {
len += 1;
} else if ( ( c & 0xF0 ) == 0xE0 || ( c & 0xF8 ) == 0xF0 ) {
len += 2;
}
}
}
return len;
}
bool is_ignored_tag( std::string_view tag )
{
return tag == "head" || tag == "style" || tag == "script" || tag == "meta" || tag == "title" || tag == "link";
}
bool is_heading_tag( std::string_view tag )
{
return tag == "h1" || tag == "h2" || tag == "h3" || tag == "h4";
}
} // namespace ricochet::render
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