1 files changed, 71 insertions, 0 deletions
diff --git a/core/src/main/scala/com/rockymadden/stringmetric/Transform.scala b/core/src/main/scala/com/rockymadden/stringmetric/Transform.scala
new file mode 100644
index 0000000..c2cdace
--- /dev/null
+++ b/core/src/main/scala/com/rockymadden/stringmetric/Transform.scala
@@ -0,0 +1,71 @@
+package com.rockymadden.stringmetric
+
+object Transform {
+	import scala.collection.immutable.NumericRange
+
+
+	type Transform[A] = (A => A)
+	type StringTransform = Transform[Array[Char]]
+
+
+	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: ((Array[Char], (Char => Boolean)) => String) = (ca, f) =>
+			ca.filter(c => f(c)).mkString
+
+		private final 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)
+	}
+}