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AK: Add UnicodeUtils with Unicode-related helper functions

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This introduces the UnicodeUtils file, which contains helper functions
related to Unicode. This is in contrast to StringUtils, whose functions
are not directly related to Unicode and are, in theory,
encoding-agnostic.
This commit is contained in:
Max Wipfli 2021-05-20 12:56:38 +02:00 committed by Andreas Kling
parent 621a4008e6
commit 3c2565da94
Notes: sideshowbarker 2024-07-18 17:40:53 +09:00 
Author: https://github.com/MaxWipfli
Commit: https://github.com/SerenityOS/serenity/commit/3c2565da942
Pull-request: https://github.com/SerenityOS/serenity/pull/7310
Issue: https://github.com/SerenityOS/serenity/issues/7286
2 changed files with 57 additions and 0 deletions
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37
AK/UnicodeUtils.cpp Normal file
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/*
* Copyright (c) 2021, Max Wipfli <mail@maxwipfli.ch>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Array.h>
#include <AK/Optional.h>
#include <AK/StringView.h>
#include <AK/UnicodeUtils.h>
namespace AK::UnicodeUtils {
Optional<StringView> get_unicode_control_code_point_alias(u32 code_point)
{
static constexpr Array<StringView, 32> ascii_controls_lookup_table = {
"NUL", "SOH", "STX", "ETX", "EOT", "ENQ", "ACK", "BEL",
"BS", "HT", "LF", "VT", "FF", "CR", "SO", "SI",
"DLE", "DC1", "DC2", "DC3", "DC4", "NAK", "SYN", "ETB",
"CAN", "EM", "SUB", "ESC", "FS", "GS", "RS", "US"
};
static constexpr Array<StringView, 32> c1_controls_lookup_table = {
"XXX", "XXX", "BPH", "NBH", "IND", "NEL", "SSA", "ESA",
"HTS", "HTJ", "VTS", "PLD", "PLU", "RI", "SS2", "SS3",
"DCS", "PU1", "PU2", "STS", "CCH", "MW", "SPA", "EPA",
"SOS", "XXX", "SCI", "CSI", "ST", "OSC", "PM", "APC"
};
if (code_point < 0x20)
return ascii_controls_lookup_table[code_point];
if (code_point >= 0x80 && code_point < 0xa0)
return c1_controls_lookup_table[code_point - 0x80];
return {};
}
}

20
AK/UnicodeUtils.h Normal file
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/*
* Copyright (c) 2021, Max Wipfli <mail@maxwipfli.ch>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Forward.h>
namespace AK::UnicodeUtils {
constexpr bool is_unicode_control_code_point(u32 code_point)
{
return code_point < 0x20 || (code_point >= 0x80 && code_point < 0xa0);
}
Optional<StringView> get_unicode_control_code_point_alias(u32);
}