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feat: settings rework part 2, domain and usecase abstraction, tests (#4680)

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Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>
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87
core/common/src/commonMain/kotlin/org/meshtastic/core/common/util/HomoglyphCharacterStringTransformer.kt Normal file
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@ -0,0 +1,87 @@
/*
* Copyright (c) 2025-2026 Meshtastic LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package org.meshtastic.core.common.util
/**
* This util class allows you to optimize the binary size of the transmitted text message strings. It replaces certain
* characters from national alphabets with the characters from the latin alphabet that have an identical appearance
* (homoglyphs), for example: cyrillic "А", "С", "у" -> latin "A", "C", "y", etc. According to statistics, such letters
* can make up about 20-25% of the total number of letters in the average text. Replacing them with Latin characters
* reduces the binary size of the transmitted message. The average transmitted message volume can then fit around
* ~140-145 characters instead of ~115-120
*/
object HomoglyphCharacterStringTransformer {
/**
* Unicode characters from the basic cyrillic block (U+0400-U+04FF), each of which occupies 2 bytes
* https://www.compart.com/en/unicode/block/U+0400 Mapped with the corresponding similarly written latin characters,
* each of which occupies 1 byte
*
* Please note that only 100% "reliable", completely visually identical characters are presented will here The
* characters that look like latin but contain various descenders, hooks, strokes, etc are not replaced with
* "simplified" latin appearance and will remain 2 byte unicode, as usual
*/
private val homoglyphCharactersSubstitutionMapping: Map<Char, Char> =
mapOf(
'\u0405' to 'S', // https://www.compart.com/en/unicode/U+0405 - Cyrillic Capital Letter Dze
'\u0406' to
'I', // https://www.compart.com/en/unicode/U+0406 - Cyrillic Capital Letter Byelorussian-Ukrainian I
'\u0408' to 'J', // https://www.compart.com/en/unicode/U+0408 - Cyrillic Capital Letter Je
'\u0410' to 'A', // https://www.compart.com/en/unicode/U+0410 - Cyrillic Capital Letter A
'\u0412' to 'B', // https://www.compart.com/en/unicode/U+0412 - Cyrillic Capital Letter Ve
'\u0415' to 'E', // https://www.compart.com/en/unicode/U+0415 - Cyrillic Capital Letter Ie
'\u041A' to 'K', // https://www.compart.com/en/unicode/U+041A - Cyrillic Capital Letter Ka
'\u041C' to 'M', // https://www.compart.com/en/unicode/U+041C - Cyrillic Capital Letter Em
'\u041D' to 'H', // https://www.compart.com/en/unicode/U+041D - Cyrillic Capital Letter En
'\u041E' to 'O', // https://www.compart.com/en/unicode/U+041E - Cyrillic Capital Letter O
'\u0420' to 'P', // https://www.compart.com/en/unicode/U+0420 - Cyrillic Capital Letter Er
'\u0421' to 'C', // https://www.compart.com/en/unicode/U+0421 - Cyrillic Capital Letter Es
'\u0422' to 'T', // https://www.compart.com/en/unicode/U+0422 - Cyrillic Capital Letter Te
'\u0425' to 'X', // https://www.compart.com/en/unicode/U+0425 - Cyrillic Capital Letter Ha
'\u0430' to 'a', // https://www.compart.com/en/unicode/U+0430 - Cyrillic Small Letter A
'\u0435' to 'e', // https://www.compart.com/en/unicode/U+0435 - Cyrillic Small Letter Ie
'\u043E' to 'o', // https://www.compart.com/en/unicode/U+043E - Cyrillic Small Letter O
'\u0440' to 'p', // https://www.compart.com/en/unicode/U+0440 - Cyrillic Small Letter Er
'\u0441' to 'c', // https://www.compart.com/en/unicode/U+0441 - Cyrillic Small Letter Es
'\u0443' to 'y', // https://www.compart.com/en/unicode/U+0443 - Cyrillic Small Letter U
'\u0445' to 'x', // https://www.compart.com/en/unicode/U+0445 - Cyrillic Small Letter Ha
'\u0455' to 's', // https://www.compart.com/en/unicode/U+0455 - Cyrillic Small Letter Dze
'\u0456' to
'i', // https://www.compart.com/en/unicode/U+0456 - Cyrillic Small Letter Byelorussian-Ukrainian I
'\u0458' to 'j', // https://www.compart.com/en/unicode/U+0458 - Cyrillic Small Letter Je
'\u04AE' to 'Y', // https://www.compart.com/en/unicode/U+04AE - Cyrillic Capital Letter Straight U
'\u0417' to '3', // https://www.compart.com/en/unicode/U+0417 - Cyrillic Capital Letter Ze
// Note that capital "ze" here is a bit special - it technically transforms to a digit "three"
// The visuals are all the same, across the different fonts etc& The core idea is the same:
// We are still replacing 2-byte unicode letter with a digit character that occupies 1 byte in Unicode
// But I have to point it out to avoid confusion
)
/**
* Returns the transformed optimized [String] value, in which some characters of the national alphabets are replaced
* with identical Latin characters so that the text takes up fewer bytes and is more compact for transmission.
*
* @param value original string value.
* @return optimized string value.
*/
fun optimizeUtf8StringWithHomoglyphs(value: String): String {
val stringBuilder = StringBuilder()
for (c in value.toCharArray()) stringBuilder.append(homoglyphCharactersSubstitutionMapping.getOrDefault(c, c))
return stringBuilder.toString()
}
}

5
core/common/src/commonMain/kotlin/org/meshtastic/core/common/util/SequentialJob.kt
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@ -25,8 +25,9 @@ import java.util.concurrent.atomic.AtomicReference
import javax.inject.Inject
/**
* A helper class that manages a single [Job]. When a new job is launched, the previous one is cancelled. This is useful
* for ensuring that only one operation of a certain type is running at a time.
* A helper class that manages a single [Job]. When a new job is launched, any previous job is cancelled. This is useful
* for ensuring that only the latest operation of a certain type is running at a time (e.g. for search or settings
* updates).
*/
class SequentialJob @Inject constructor() {
private val job = AtomicReference<Job?>()