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82 lines
2.6 KiB
C++
82 lines
2.6 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/Concepts.h>
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#include <AK/Error.h>
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#include <AK/Forward.h>
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namespace AK::UnicodeUtils {
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constexpr int bytes_to_store_code_point_in_utf8(u32 code_point)
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{
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if (code_point <= 0x7f)
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return 1;
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if (code_point <= 0x7ff)
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return 2;
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if (code_point <= 0xffff)
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return 3;
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if (code_point <= 0x10ffff)
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return 4;
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return 0;
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}
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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(static_cast<char>(code_point));
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return 1;
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} else if (code_point <= 0x07ff) {
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callback(static_cast<char>(((code_point >> 6) & 0x1f) | 0xc0));
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callback(static_cast<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(static_cast<char>(((code_point >> 12) & 0x0f) | 0xe0));
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callback(static_cast<char>(((code_point >> 6) & 0x3f) | 0x80));
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callback(static_cast<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(static_cast<char>(((code_point >> 18) & 0x07) | 0xf0));
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callback(static_cast<char>(((code_point >> 12) & 0x3f) | 0x80));
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callback(static_cast<char>(((code_point >> 6) & 0x3f) | 0x80));
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callback(static_cast<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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template<FallibleFunction<char> Callback>
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[[nodiscard]] ErrorOr<int> try_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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TRY(callback(static_cast<char>(code_point)));
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return 1;
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}
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if (code_point <= 0x07ff) {
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TRY(callback(static_cast<char>((((code_point >> 6) & 0x1f) | 0xc0))));
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TRY(callback(static_cast<char>((((code_point >> 0) & 0x3f) | 0x80))));
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return 2;
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}
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if (code_point <= 0xffff) {
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TRY(callback(static_cast<char>((((code_point >> 12) & 0x0f) | 0xe0))));
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TRY(callback(static_cast<char>((((code_point >> 6) & 0x3f) | 0x80))));
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TRY(callback(static_cast<char>((((code_point >> 0) & 0x3f) | 0x80))));
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return 3;
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}
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if (code_point <= 0x10ffff) {
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TRY(callback(static_cast<char>((((code_point >> 18) & 0x07) | 0xf0))));
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TRY(callback(static_cast<char>((((code_point >> 12) & 0x3f) | 0x80))));
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TRY(callback(static_cast<char>((((code_point >> 6) & 0x3f) | 0x80))));
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TRY(callback(static_cast<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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