Changed compare implemention. It is now required to specify the size of the n-gram. Typically, this was 2.

2 files changed, 10 insertions, 5 deletions

diff --git a/cli/source/core/scala/org/hashtree/stringmetric/cli/similarity/diceSorensenMetric.scala b/cli/source/core/scala/org/hashtree/stringmetric/cli/similarity/diceSorensenMetric.scala
index 229e989..de0b302 100755
--- a/cli/source/core/scala/org/hashtree/stringmetric/cli/similarity/diceSorensenMetric.scala
+++ b/cli/source/core/scala/org/hashtree/stringmetric/cli/similarity/diceSorensenMetric.scala
@@ -19,7 +19,9 @@ object diceSorensenMetric extends Command {
 				help()
 				exit(options)
 			// Execute.
-			} else if (options.contains('dashless) && options('dashless).count(_ == ' ') == 1) {
+			} else if (options.contains('dashless) && options('dashless).count(_ == ' ') == 1 &&
+				options.contains('n) && ParseUtility.parseInt(options('n)).isDefined
+			) {
 				execute(options)
 				exit(options)
 			// Invalid syntax.
@@ -39,18 +41,21 @@ object diceSorensenMetric extends Command {
 			tab + "diceSorensenMetric [Options] string1 string2..." + ls + ls +
 			"Options:" + ls +
 			tab + "-h, --help" + ls +
-			tab + tab + "Outputs description, syntax, and options."
+			tab + tab + "Outputs description, syntax, and options." +
+			tab + "--n" + ls +
+			tab + tab + "The n, traditionally 2."
 		)
 	}
 
 	override def execute(options: OptionMap): Unit = {
 		val strings = options('dashless).split(" ")
+		val n = ParseUtility.parseInt(options('n)).get
 
 		println(
 			DiceSorensenMetric.compare(
 				strings(0),
 				strings(1)
-			)(new StringFilterDelegate with AsciiLetterCaseStringFilter).getOrElse("not comparable").toString
+			)(n)(new StringFilterDelegate with AsciiLetterCaseStringFilter).getOrElse("not comparable").toString
 		)
 	}
 }
\ No newline at end of file
diff --git a/cli/source/test/scala/org/hashtree/stringmetric/cli/similarity/diceSorensenMetricSpec.scala b/cli/source/test/scala/org/hashtree/stringmetric/cli/similarity/diceSorensenMetricSpec.scala
index d9e2cb0..1e2c286 100755
--- a/cli/source/test/scala/org/hashtree/stringmetric/cli/similarity/diceSorensenMetricSpec.scala
+++ b/cli/source/test/scala/org/hashtree/stringmetric/cli/similarity/diceSorensenMetricSpec.scala
@@ -13,14 +13,14 @@ final class diceSorensenMetricSpec extends ScalaTest {
 					val out = new java.io.ByteArrayOutputStream()
 
 					Console.withOut(out)(
-						diceSorensenMetric.main(Array("--unitTest", "--debug", "aBc", "abc"))
+						diceSorensenMetric.main(Array("--unitTest", "--debug", "--n=2", "aBc", "abc"))
 					)
 
 					out.toString should equal ("1.0\n")
 					out.reset()
 
 					Console.withOut(out)(
-						diceSorensenMetric.main(Array("--unitTest", "--debug", "aBc", "xyz"))
+						diceSorensenMetric.main(Array("--unitTest", "--debug", "--n=2", "aBc", "xyz"))
 					)
 
 					out.toString should equal ("0.0\n")