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Google's Generative AI Multiplatform SDK

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/*
 * Copyright 2023 Shreyas Patil
 *
 * 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 dev.shreyaspatil.ai.client.generativeai.common.util

/**
 * Removes the last character from the [StringBuilder].
 *
 * If the StringBuilder is empty, calling this function will throw an [IndexOutOfBoundsException].
 *
 * @return The [StringBuilder] used to make the call, for optional chaining.
 * @throws IndexOutOfBoundsException if the StringBuilder is empty.
 */
internal fun StringBuilder.removeLast(): StringBuilder {
    if (this.isEmpty()) {
        throw IndexOutOfBoundsException("StringBuilder is empty.")
    } else {
        val result = this.toString().dropLast(1)
        return StringBuilder(result)
    }
}