Improving the repl help infrastructure, and mad...

Improving the repl help infrastructure, and made the :wrap command more
robust. No review.

1 files changed, 45 insertions, 0 deletions

diff --git a/src/compiler/scala/tools/nsc/interpreter/ReplStrings.scala b/src/compiler/scala/tools/nsc/interpreter/ReplStrings.scala
new file mode 100644
index 0000000000..cef46c963a
--- /dev/null
+++ b/src/compiler/scala/tools/nsc/interpreter/ReplStrings.scala
@@ -0,0 +1,45 @@
+/* NSC -- new Scala compiler
+ * Copyright 2005-2011 LAMP/EPFL
+ * @author  Paul Phillips
+ */
+
+package scala.tools.nsc
+package interpreter
+
+import scala.collection.{ mutable, immutable }
+import scala.PartialFunction.cond
+import scala.reflect.NameTransformer
+import util.Chars
+
+trait ReplStrings {
+  // Longest common prefix
+  def longestCommonPrefix(xs: List[String]): String = {
+    if (xs.isEmpty || xs.contains("")) ""
+    else xs.head.head match {
+      case ch =>
+        if (xs.tail forall (_.head == ch)) "" + ch + longestCommonPrefix(xs map (_.tail))
+        else ""
+    }
+  }
+  /** Convert a string into code that can recreate the string.
+   *  This requires replacing all special characters by escape
+   *  codes. It does not add the surrounding " marks.  */
+  def string2code(str: String): String = {
+    val res = new StringBuilder
+    for (c <- str) c match {
+      case '"' | '\'' | '\\'  => res += '\\' ; res += c
+      case _ if c.isControl   => res ++= Chars.char2uescape(c)
+      case _                  => res += c
+    }
+    res.toString
+  }
+
+  def string2codeQuoted(str: String) =
+    "\"" + string2code(str) + "\""
+
+  def any2stringOf(x: Any, maxlen: Int) =
+    "scala.runtime.ScalaRunTime.replStringOf(%s, %s)".format(x, maxlen)
+
+  def words(s: String) = s.trim split "\\s+" filterNot (_ == "") toList
+  def isQuoted(s: String) = (s.length >= 2) && (s.head == s.last) && ("\"'" contains s.head)
+}