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Contents
// Copyright (c) 2014-2022 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
#ifndef TAO_PEGTL_CONTRIB_INTERNAL_PEEK_UTF32_HPP
#define TAO_PEGTL_CONTRIB_INTERNAL_PEEK_UTF32_HPP
#include <cstddef>
#include "../../config.hpp"
#include "../../internal/input_pair.hpp"
#include "read_uint.hpp"
namespace TAO_PEGTL_NAMESPACE::internal
{
template< typename R >
struct peek_utf32_impl
{
using data_t = char32_t;
using pair_t = input_pair< char32_t >;
static_assert( sizeof( char32_t ) == 4 );
template< typename ParseInput >
[[nodiscard]] static pair_t peek( ParseInput& in ) noexcept( noexcept( in.size( 4 ) ) )
{
if( in.size( 4 ) < 4 ) {
return { 0, 0 };
}
const char32_t t = R::read( in.current() );
if( ( t <= 0x10ffff ) && !( t >= 0xd800 && t <= 0xdfff ) ) {
return { t, 4 };
}
return { 0, 0 };
}
};
using peek_utf32_be = peek_utf32_impl< read_uint32_be >;
using peek_utf32_le = peek_utf32_impl< read_uint32_le >;
} // namespace TAO_PEGTL_NAMESPACE::internal
#endif
Version data entries
13 entries across 13 versions & 1 rubygems