SI-9749 REPL strip lead ws on dot continuation (#5097)

Permit leading whitespace before `.` for continued selection.

This is just to handle pastes, which will typically include
indented text, and not to make dot-continuation especially robust.

1 files changed, 7 insertions, 7 deletions

diff --git a/src/repl/scala/tools/nsc/interpreter/Completion.scala b/src/repl/scala/tools/nsc/interpreter/Completion.scala
index 3d0b9a975c..6f5194d2f9 100644
--- a/src/repl/scala/tools/nsc/interpreter/Completion.scala
+++ b/src/repl/scala/tools/nsc/interpreter/Completion.scala
@@ -24,11 +24,11 @@ object Completion {
   case class Candidates(cursor: Int, candidates: List[String]) { }
   val NoCandidates = Candidates(-1, Nil)
 
-  def looksLikeInvocation(code: String) = (
-        (code != null)
-    &&  (code startsWith ".")
-    && !(code == ".")
-    && !(code startsWith "./")
-    && !(code startsWith "..")
-  )
+  // a leading dot plus something, but not ".." or "./", ignoring leading whitespace
+  private val dotlike = """\s*\.[^./].*""".r
+  def looksLikeInvocation(code: String) = code match {
+    case null      => false   // insurance
+    case dotlike() => true
+    case _         => false
+  }
 }