73 lines
1.7 KiB
Kotlin
73 lines
1.7 KiB
Kotlin
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@file:JvmName("StringUtils")
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package com.keylesspalace.tusky.util
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import java.util.Random
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private const val POSSIBLE_CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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fun randomAlphanumericString(count: Int): String {
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val chars = CharArray(count)
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val random = Random()
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for (i in 0 until count) {
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chars[i] = POSSIBLE_CHARS[random.nextInt(POSSIBLE_CHARS.length)]
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}
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return String(chars)
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}
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// We sort statuses by ID. Something we need to invent some ID for placeholder.
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// Not sure if inc()/dec() should be made `operator` or not
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/**
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* "Increment" string so that during sorting it's bigger than [this].
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*/
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fun String.inc(): String {
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// We assume that we will stay in the safe range for now
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val builder = this.toCharArray()
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builder.last().inc()
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return String(builder)
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}
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/**
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* "Decrement" string so that during sorting it's smaller than [this].
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*/
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fun String.dec(): String {
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val builder = this.toCharArray()
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var i = builder.lastIndex
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while (i > 0) {
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if (builder[i] > '0') {
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builder[i] = builder[i].dec()
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break
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} else {
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builder[i] = 'z'
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}
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i--
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}
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// All characters were '0'
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if (i == 0 && this.isNotEmpty()) {
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// Remove one character
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return String(builder.copyOfRange(1, builder.size))
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}
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return String(builder)
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}
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/**
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* A < B (strictly) by length and then by content.
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* Examples:
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* "abc" < "bcd"
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* "ab" < "abc"
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* "cb" < "abc"
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* not: "ab" < "ab"
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* not: "abc" > "cb"
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*/
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fun String.isLessThan(other: String): Boolean {
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return when {
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this.length < other.length -> true
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this.length > other.length -> false
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else -> this < other
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}
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}
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