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/*
 * Copyright 2010-2015 JetBrains s.r.o.
 *
 * 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 kotlin

/**
 * Represents a readable sequence of [Char] values.
 */
public interface CharSequence {
    /**
     * Returns the length of this character sequence.
     */
    public val length: Int

    /**
     * Returns the character at the specified [index] in this character sequence.
     *
     * @throws [IndexOutOfBoundsException] if the [index] is out of bounds of this character sequence.
     *
     * Note that the [String] implementation of this interface in Kotlin/JS has unspecified behavior
     * if the [index] is out of its bounds.
     */
    public operator fun get(index: Int): Char

    /**
     * Returns a new character sequence that is a subsequence of this character sequence,
     * starting at the specified [startIndex] and ending right before the specified [endIndex].
     *
     * @param startIndex the start index (inclusive).
     * @param endIndex the end index (exclusive).
     */
    public fun subSequence(startIndex: Int, endIndex: Int): CharSequence
}