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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/renderer.hh"
#include <array>
#include <cstdint>
#include <stdexcept>
namespace ricochet::render {
namespace {
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; // Not a valid number, leave as-is
} catch ( const std::out_of_range& ) {
(void)0; // Value too large, leave as-is
}
}
pos++;
}
return text;
}
std::string extract_href( const std::string& tag_name )
{
std::size_t pos = tag_name.find( "href=\"" );
if ( pos != std::string::npos ) {
pos += 6;
const std::size_t end = tag_name.find( '\"', pos );
if ( end != std::string::npos ) {
return tag_name.substr( pos, end - pos );
}
}
pos = tag_name.find( "href='" );
if ( pos != std::string::npos ) {
pos += 6;
const std::size_t end = tag_name.find( '\'', pos );
if ( end != std::string::npos ) {
return tag_name.substr( pos, end - pos );
}
}
return "";
}
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";
}
void render_node( const parser::DomNode& node, // NOLINT(misc-no-recursion)
RenderResult& result ) // NOLINT(bugprone-easily-swappable-parameters)
{
std::string& output = result.text;
std::vector<std::string>& links = result.links;
std::vector<std::string>& inputs = result.inputs;
const std::size_t space_pos = node.tag_name.find( ' ' );
const std::string base_tag
= ( space_pos == std::string::npos ) ? node.tag_name : node.tag_name.substr( 0, space_pos );
if ( is_ignored_tag( base_tag ) ) {
return;
}
if ( base_tag.empty() ) {
output += decode_entities( node.text_content );
return;
}
const bool is_header = is_heading_tag( base_tag );
const bool is_link = ( base_tag == "a" );
const bool is_list_item = ( base_tag == "li" );
const bool is_input = ( base_tag == "input" || base_tag == "textarea" );
if ( is_header ) {
output += "\n\n\033[1;31m";
} else if ( is_link ) {
output += "\033[4;34m";
} else if ( is_list_item ) {
output += "\n • ";
} else if ( is_input ) {
inputs.emplace_back( "input_field" );
output += " \033[7;33m[I" + std::to_string( inputs.size() ) + "]\033[0m ";
} else if ( base_tag == "p" || base_tag == "div" || is_header ) {
if ( !output.empty() && output.back() != '\n' ) {
output += "\n";
}
}
for ( const auto& child : node.children ) {
render_node( child, result );
}
if ( is_header ) {
output += "\033[0m";
} else if ( is_link ) {
output += "\033[0m";
const std::string href = extract_href( node.tag_name );
if ( !href.empty() && !href.starts_with( "javascript:" ) && !href.starts_with( "#" ) ) {
links.push_back( decode_entities( href ) );
output += " \033[7m[" + std::to_string( links.size() ) + "]\033[0m"; // 打印数字标签！
}
}
if ( base_tag == "h1" || base_tag == "p" || base_tag == "div" ) {
output += "\n";
}
if ( base_tag == "img" ) {
std::size_t alt_pos = node.tag_name.find( "alt=\"" );
if ( alt_pos != std::string::npos ) {
alt_pos += 5;
const std::size_t alt_end = node.tag_name.find( '"', alt_pos );
output += " \033[90m[Image: " + node.tag_name.substr( alt_pos, alt_end - alt_pos ) + "]\033[0m ";
} else {
output += " \033[90m[IMAGE]\033[0m ";
}
}
}
} // namespace
RenderResult Renderer::render( // NOLINT(readability-convert-member-functions-to-static)
const parser::DomNode& node ) const
{
RenderResult result;
render_node( node, result );
return result;
}
} // namespace ricochet::render
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