core/src/main/scala/com/rockymadden/stringmetric/phonetic/SoundexMetric.scala


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package com.rockymadden.stringmetric.phonetic

import com.rockymadden.stringmetric._
import com.rockymadden.stringmetric.Alphabet._

case object SoundexMetric extends StringMetric[Boolean] {
	override def compare(a: Array[Char], b: Array[Char]): Option[Boolean] =
		if (a.length == 0 || !(Alpha isSuperset a.head) || b.length == 0 || !(Alpha isSuperset b.head)) None
		else if (a.head.toLower != b.head.toLower) Some(false)
		else SoundexAlgorithm.compute(a).filter(_.length > 0).flatMap { se1 =>
			SoundexAlgorithm.compute(b).filter(_.length > 0).map(se1.sameElements(_))
		}

	final override def compare(a: String, b: String): Option[Boolean] = compare(a.toCharArray, b.toCharArray)
}