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/* NSC -- new Scala compiler
* Copyright 2005-2011 LAMP/EPFL
* @author Paul Phillips
*/
package scala.tools.nsc
package interpreter
/** If it looks like they're pasting in a scala interpreter
* transcript, remove all the formatting we inserted so we
* can make some sense of it.
*/
abstract class Pasted {
def ContinueString: String
def PromptString: String
def interpret(line: String): Unit
private var isRunning = false
def running = isRunning
/** Commands start on lines beginning with "scala>" and each successive
* line which begins with the continuation string is appended to that command.
* Everything else is discarded. When the end of the transcript is spotted,
* all the commands are replayed.
*/
def apply(lines: TraversableOnce[String]) = {
val cmds = lines reduceLeft append split PromptString filterNot (_.trim == "") toList;
println("// Replaying %d commands from transcript.\n" format cmds.size)
isRunning = true
try cmds foreach interpret
finally isRunning = false
}
private def isPrompted(line: String) = line startsWith PromptString
private def isContinuation(line: String) = line startsWith ContinueString
private def append(code: String, line: String): String =
if (isPrompted(line)) code + "\n" + line
else if (isContinuation(line)) code + "\n" + line.stripPrefix(ContinueString)
else fixResRefs(code, line)
/** If the line looks like
* res15: Int
* then we go back in time to the preceding scala> prompt and rewrite
* the line containing <expr> as
* val res15 = { <expr> }
* and the rest as they say is rewritten history.
*
* In all other cases, discard the line.
*/
private val resRegex = """^(res\d+):.*""".r
private def fixResRefs(code: String, line: String) = line match {
case resRegex(resName) if code contains PromptString =>
val (str1, str2) = code splitAt code.lastIndexOf(PromptString) + PromptString.length
"%sval %s = { %s }".format(str1, resName, str2)
case _ => code
}
}
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