CharHelpers.kt

/*
 * Copyright 2019 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.ui.util

fun isSurrogatePair(high: Char, low: Char): Boolean = high.isHighSurrogate() && low.isLowSurrogate()

// Returns -1 if cannot go back.
expect fun String.findPrecedingBreak(index: Int): Int

// Returns -1 if cannot go forward.
expect fun String.findFollowingBreak(index: Int): Int