Another big Interpreter patch, this one mostly ...

Another big Interpreter patch, this one mostly attacking
InterpreterLoop. This adds opening cuts of a number of features: tab
completion for repl identifiers (requires using -Ycompletion for now),
a :power repl command that enables power user commands, and more. I'll
document it properly once it's a bit less experimental.

1 files changed, 28 insertions, 0 deletions

diff --git a/src/compiler/scala/tools/nsc/interpreter/Completion.scala b/src/compiler/scala/tools/nsc/interpreter/Completion.scala
new file mode 100644
index 0000000000..7e2c8a9f04
--- /dev/null
+++ b/src/compiler/scala/tools/nsc/interpreter/Completion.scala
@@ -0,0 +1,28 @@
+/* NSC -- new Scala compiler
+ * Copyright 2005-2009 LAMP/EPFL
+ * @author Paul Phillips
+ */
+// $Id$
+
+package scala.tools.nsc.interpreter
+
+import jline._
+
+// REPL completor - queries supplied interpreter for valid completions
+// based on current contents of buffer.
+class Completion(val interpreter: Interpreter) extends Completor {
+  import java.util.{ List => JList }
+
+  override def complete(buffer: String, cursor: Int, candidates: JList[_]): Int = {
+    if (buffer == null) return 0
+    val clist = candidates.asInstanceOf[JList[String]]
+    val lastDot = buffer.lastIndexOf('.')
+    val (path, stub) =
+      if (lastDot < 0) (buffer, "")
+      else (buffer.substring(0, lastDot), buffer.substring(lastDot + 1))
+
+    val members = interpreter membersOfIdentifier path
+    members.filter(_ startsWith stub).foreach(x => clist add x)
+    buffer.length - stub.length
+  }
+}