org.fernice.std.List.kt Maven / Gradle / Ivy

Go to download
/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

package org.fernice.std

fun  List.asReversedSequence(): Sequence {
    return ReversedListSequence(this)
}

private class ReversedListSequence(
    private val list: List,
) : Sequence {
    override fun iterator(): Iterator {
        return object : Iterator {
            private val iterator = list.listIterator(list.size)

            override fun hasNext(): Boolean = iterator.hasPrevious()

            override fun next(): T = iterator.previous()
        }
    }
}


fun  List.resized(): List {
    return ArrayList(this)
}

fun  MutableCollection.drain(): List {
    val list = toList()
    clear()
    return list
}

fun  MutableList.truncate(size: Int) {
    if (this.size > size){
        subList(size, this.size).clear()
    }
}