helper classes for pattern matching on arrays a...

helper classes for pattern matching on arrays and strings

2 files changed, 65 insertions, 0 deletions

diff --git a/sources/scala/IterableArray.scala b/sources/scala/IterableArray.scala
new file mode 100644
index 0000000000..1ca108501b
--- /dev/null
+++ b/sources/scala/IterableArray.scala
@@ -0,0 +1,32 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003, LAMP/EPFL                  **
+**  __\ \/ /__/ __ |/ /__/ __ |                                         **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+** $Id$
+\*                                                                      */
+
+package scala;
+
+/* use this for pattern matching on arrays. examples
+<pre>
+new IterableArray( args ).match {
+      case Seq(x) => System.out.println("contains 1 arg");
+      case Seq() => System.out.println("no arguments given");
+};
+</pre>
+*/
+class IterableArray[A]( arr:Array[A] ) with Seq[A]{
+  def elements = new Iterator[A] {
+    var i:int=0;
+    def hasNext = {
+      i < arr.length
+    }
+    def next:A = {
+      val res = arr( i ); i=i+1; res
+    }
+  }
+  def length = arr.length;
+  def apply( i:int ) = arr( i );
+}
diff --git a/sources/scala/IterableString.scala b/sources/scala/IterableString.scala
new file mode 100644
index 0000000000..e3e15e5757
--- /dev/null
+++ b/sources/scala/IterableString.scala
@@ -0,0 +1,33 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003, LAMP/EPFL                  **
+**  __\ \/ /__/ __ |/ /__/ __ |                                         **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+** $Id$
+\*                                                                      */
+
+package scala;
+
+/* use this to for pattern matching on strings. example
+<pre>
+ val s = "supercalifragilistic-expialidocious";
+    new IterableString( s ).match {
+      case Seq(_ *, 'f','r','a', _ *) => System.out.println("fra");
+      case _ => System.out.println("this never happens");
+  }
+</pre>
+*/
+class IterableString( s:String ) with Seq[char]{
+  def elements= new Iterator[char] {
+    var i:int=0;
+    def hasNext = {
+      i < s.length()
+    }
+    def next:char = {
+      val res = s.charAt( i ); i=i+1; res
+    }
+  }
+  def length = s.length();
+  def apply( i:int ) = s.charAt( i );
+}