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Contents
// Copyright (c) 2017-2020 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/json/
#ifndef TAO_JSON_EVENTS_KEY_CAMEL_CASE_TO_SNAKE_CASE_HPP
#define TAO_JSON_EVENTS_KEY_CAMEL_CASE_TO_SNAKE_CASE_HPP
#include <cctype>
#include <string>
#include <string_view>
namespace tao::json::events
{
template< typename Consumer >
struct key_camel_case_to_snake_case
: Consumer
{
using Consumer::Consumer;
void key( const std::string_view v )
{
std::string t;
bool last_upper = false;
for( const auto c : v ) {
if( std::isupper( c ) != 0 ) {
last_upper = true;
t += c;
}
else {
if( last_upper ) {
const char o = t.back();
t.pop_back();
if( !t.empty() && t.back() != '_' ) {
t += '_';
}
t += o;
}
last_upper = false;
t += c;
}
}
std::string r;
bool last_lower = false;
for( const auto c : t ) {
if( std::isupper( c ) != 0 ) {
if( last_lower ) {
r += '_';
}
last_lower = false;
r += static_cast< char >( std::tolower( c ) );
}
else {
last_lower = ( std::islower( c ) != 0 );
r += c;
}
}
Consumer::key( std::move( r ) );
}
};
} // namespace tao::json::events
#endif
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