StringHelpers.android.kt
/*
* Copyright 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.compose.foundation.text
import androidx.emoji2.text.EmojiCompat
import java.text.BreakIterator
internal actual fun String.findPrecedingBreak(index: Int): Int {
val emojiBreak =
getEmojiCompatIfLoaded()?.getEmojiStart(this, maxOf(0, index - 1))?.takeUnless { it == -1 }
if (emojiBreak != null) return emojiBreak
val it = BreakIterator.getCharacterInstance()
it.setText(this)
return it.preceding(index)
}
internal actual fun String.findFollowingBreak(index: Int): Int {
val emojiBreak = getEmojiCompatIfLoaded()?.getEmojiEnd(this, index)?.takeUnless { it == -1 }
if (emojiBreak != null) return emojiBreak
val it = BreakIterator.getCharacterInstance()
it.setText(this)
return it.following(index)
}
private fun getEmojiCompatIfLoaded(): EmojiCompat? =
if (EmojiCompat.isConfigured())
EmojiCompat.get().takeIf { it.loadState == EmojiCompat.LOAD_STATE_SUCCEEDED }
else null