package com.rockymadden.stringmetric

import scala.collection.immutable.NumericRange

trait transform {
	private val Ascii = NumericRange(0x00, 0x7F, 1)
	private val ExtendedAscii = NumericRange(0x00, 0x7F, 1)
	private val Latin = NumericRange(0x00, 0x24F, 1)
	private val LowerCase = NumericRange(0x61, 0x7A, 1)
	private val Numbers = NumericRange(0x30, 0x39, 1)
	private val UpperCase = NumericRange(0x41, 0x5A, 1)

	private val filter: ((Array[Char], (Char => Boolean)) => String) = (ca, f) =>
		ca.filter(c => f(c)).mkString

	private val filterNot: ((Array[Char], (Char => Boolean)) => String) = (ca, f) =>
		ca.filterNot(c => f(c)).mkString

	val filterAlpha: StringTransform = (ca) => filter(ca, c => {
		val ci = c.toInt
		LowerCase.contains(ci) || UpperCase.contains(ci)
	})

	val filterNotAlpha: StringTransform = (ca) => filterNot(ca, c => {
		val ci = c.toInt
		LowerCase.contains(ci) || UpperCase.contains(ci)
	})

	val filterAlphaNumeric: StringTransform = (ca) => filter(ca, c => {
		val ci = c.toInt
		LowerCase.contains(ci) || UpperCase.contains(ci) || Numbers.contains(ci)
	})

	val filterNotAlphaNumeric: StringTransform = (ca) => filterNot(ca, c => {
		val ci = c.toInt
		LowerCase.contains(ci) || UpperCase.contains(ci) || Numbers.contains(ci)
	})

	val filterAscii: StringTransform = (ca) => filter(ca, c => Ascii.contains(c.toInt))

	val filterNotAscii: StringTransform = (ca) => filterNot(ca, c => Ascii.contains(c.toInt))

	val filterExtendedAscii: StringTransform = (ca) => filter(ca, c => ExtendedAscii.contains(c.toInt))

	val filterNotExtendedAscii: StringTransform = (ca) => filterNot(ca, c => ExtendedAscii.contains(c.toInt))

	val filterLatin: StringTransform = (ca) => filter(ca, c => Latin.contains(c.toInt))

	val filterNotLatin: StringTransform = (ca) => filterNot(ca, c => Latin.contains(c.toInt))

	val filterLowerCase: StringTransform = (ca) => filter(ca, c => LowerCase.contains(c.toInt))

	val filterNotLowerCase: StringTransform = (ca) => filterNot(ca, c => LowerCase.contains(c.toInt))

	val filterNumeric: StringTransform = (ca) => filter(ca, c => Numbers.contains(c.toInt))

	val filterNotNumeric: StringTransform = (ca) => filterNot(ca, c => Numbers.contains(c.toInt))

	val filterUpperCase: StringTransform = (ca) => filter(ca, c => UpperCase.contains(c.toInt))

	val filterNotUpperCase: StringTransform = (ca) => filterNot(ca, c => UpperCase.contains(c.toInt))

	val ignoreAlphaCase: StringTransform = (ca) => ca.map(c => if (c >= 65 && c <= 90) (c + 32).toChar else c)
}

object transform extends transform