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package com.rockymadden.stringmetric.phonetic
import com.rockymadden.stringmetric.Metric.StringMetric
case object SoundexMetric extends StringMetric[Boolean] {
import com.rockymadden.stringmetric.Alphabet.Alpha
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)
}
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