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A monadic (I think...) recursive-descent parser written in Kotlin

There is a newer version: 5.3.0

package com.copperleaf.kudzu

/**
 * Acutal/expect declarations for Kudzu
 */
actual object KudzuPlatform {

    actual fun isLetter(char: Char): Boolean {
        return char in (('a'..'z') + ('A'..'Z'))
    }

    actual fun isDigit(char: Char): Boolean {
        return char in ('0'..'9')
    }

    actual fun isLetterOrDigit(char: Char): Boolean {
        return isLetter(char) || isDigit(char)
    }
}