Added transforms.

2 files changed, 71 insertions, 2 deletions

diff --git a/core/source/main/scala/com/rockymadden/stringmetric/Metric.scala b/core/source/main/scala/com/rockymadden/stringmetric/Metric.scala
index 3bbed88..64be8fa 100755
--- a/core/source/main/scala/com/rockymadden/stringmetric/Metric.scala
+++ b/core/source/main/scala/com/rockymadden/stringmetric/Metric.scala
@@ -2,11 +2,11 @@ package com.rockymadden.stringmetric
 
 object Metric {
 	trait MetricLike[A, B] {
-		def compare(a1: A, a2: A): Option[B]
+		def compare(a: A, b: A): Option[B]
 	}
 
 
 	trait StringMetricLike[A] extends MetricLike[Array[Char], A] {
-		def compare(string1: String, string2: String): Option[A]
+		def compare(a: String, b: String): Option[A]
 	}
 }
diff --git a/core/source/main/scala/com/rockymadden/stringmetric/Transform.scala b/core/source/main/scala/com/rockymadden/stringmetric/Transform.scala
new file mode 100644
index 0000000..b09ebb6
--- /dev/null
+++ b/core/source/main/scala/com/rockymadden/stringmetric/Transform.scala
@@ -0,0 +1,69 @@
+package com.rockymadden.stringmetric
+
+object Transform {
+	import scala.collection.immutable.NumericRange
+
+
+	type Transform[A] = (A => A)
+	type StringTransform = Transform[String]
+
+
+	object StringTransform {
+		private final val Ascii = NumericRange(0x00, 0x7F, 1)
+		private final val ExtendedAscii = NumericRange(0x00, 0x7F, 1)
+		private final val Latin = NumericRange(0x00, 0x24F, 1)
+		private final val LowerCase = NumericRange(0x61, 0x7A, 1)
+		private final val Numbers = NumericRange(0x30, 0x39, 1)
+		private final val UpperCase = NumericRange(0x41, 0x5A, 1)
+
+		private final val filter: ((String, (Char => Boolean)) => String) = (s, f) =>
+			s.toCharArray.filter(c => f(c)).mkString
+
+		private final val filterNot: ((String, (Char => Boolean)) => String) = (s, f) =>
+			s.toCharArray.filterNot(c => f(c)).mkString
+
+		val filterAlpha: StringTransform = (string) => filter(string, c => {
+			val ci = c.toInt
+			LowerCase.contains(ci) || UpperCase.contains(ci)
+		})
+
+		val filterNotAlpha: StringTransform = (string) => filterNot(string, c => {
+			val ci = c.toInt
+			LowerCase.contains(ci) || UpperCase.contains(ci)
+		})
+
+		val filterAlphaNumeric: StringTransform = (string) => filter(string, c => {
+			val ci = c.toInt
+			LowerCase.contains(ci) || UpperCase.contains(ci) || Numbers.contains(ci)
+		})
+
+		val filterNotAlphaNumeric: StringTransform = (string) => filterNot(string, c => {
+			val ci = c.toInt
+			LowerCase.contains(ci) || UpperCase.contains(ci) || Numbers.contains(ci)
+		})
+
+		val filterAscii: StringTransform = (string) => filter(string, c => Ascii.contains(c.toInt))
+
+		val filterNotAscii: StringTransform = (string) => filterNot(string, c => Ascii.contains(c.toInt))
+
+		val filterExtendedAscii: StringTransform = (string) => filter(string, c => ExtendedAscii.contains(c.toInt))
+
+		val filterNotExtendedAscii: StringTransform = (string) => filterNot(string, c => ExtendedAscii.contains(c.toInt))
+
+		val filterLatin: StringTransform = (string) => filter(string, c => Latin.contains(c.toInt))
+
+		val filterNotLatin: StringTransform = (string) => filterNot(string, c => Latin.contains(c.toInt))
+
+		val filterLowerCase: StringTransform = (string) => filter(string, c => LowerCase.contains(c.toInt))
+
+		val filterNotLowerCase: StringTransform = (string) => filterNot(string, c => LowerCase.contains(c.toInt))
+
+		val filterNumeric: StringTransform = (string) => filter(string, c => Numbers.contains(c.toInt))
+
+		val filterNotNumeric: StringTransform = (string) => filterNot(string, c => Numbers.contains(c.toInt))
+
+		val filterUpperCase: StringTransform = (string) => filter(string, c => UpperCase.contains(c.toInt))
+
+		val filterNotUpperCase: StringTransform = (string) => filterNot(string, c => UpperCase.contains(c.toInt))
+	}
+}