mirror of
https://github.com/SerenityOS/serenity
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c8367df746
This function converts a single wide character into its multibyte representation (UTF-8 in our case). It is called from libc++'s `std::basic_ostream<wchar_t>::flush`, which gets called at program exit from a global destructor in order to flush `std::wcout`.
46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
/*
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* Copyright (c) 2021, Max Wipfli <mail@maxwipfli.ch>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Forward.h>
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namespace AK::UnicodeUtils {
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constexpr bool is_unicode_control_code_point(u32 code_point)
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{
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return code_point < 0x20 || (code_point >= 0x80 && code_point < 0xa0);
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}
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Optional<StringView> get_unicode_control_code_point_alias(u32);
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template<typename Callback>
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[[nodiscard]] constexpr int code_point_to_utf8(u32 code_point, Callback callback)
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{
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if (code_point <= 0x7f) {
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callback((char)code_point);
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return 1;
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} else if (code_point <= 0x07ff) {
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callback((char)(((code_point >> 6) & 0x1f) | 0xc0));
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callback((char)(((code_point >> 0) & 0x3f) | 0x80));
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return 2;
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} else if (code_point <= 0xffff) {
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callback((char)(((code_point >> 12) & 0x0f) | 0xe0));
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callback((char)(((code_point >> 6) & 0x3f) | 0x80));
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callback((char)(((code_point >> 0) & 0x3f) | 0x80));
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return 3;
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} else if (code_point <= 0x10ffff) {
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callback((char)(((code_point >> 18) & 0x07) | 0xf0));
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callback((char)(((code_point >> 12) & 0x3f) | 0x80));
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callback((char)(((code_point >> 6) & 0x3f) | 0x80));
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callback((char)(((code_point >> 0) & 0x3f) | 0x80));
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return 4;
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}
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return -1;
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}
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}
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