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/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Paul Phillips
*/
package scala.tools.partest
import scala.tools.nsc.Settings
import scala.tools.nsc.interpreter.{ ILoop, replProps }
import java.lang.reflect.{ Method => JMethod, Field => JField }
import scala.util.matching.Regex
import scala.util.matching.Regex.Match
/** A class for testing repl code.
* It filters the line of output that mentions a version number.
*/
abstract class ReplTest extends DirectTest {
// override to transform Settings object immediately before the finish
def transformSettings(s: Settings): Settings = s
// final because we need to enforce the existence of a couple settings.
final override def settings: Settings = {
val s = super.settings
s.Xnojline.value = true
transformSettings(s)
}
def normalize(s: String) = s
/** True for SessionTest to preserve session text. */
def inSession: Boolean = false
/** True to preserve welcome header, eliding version number. */
def welcoming: Boolean = false
lazy val header = replProps.welcome
def eval() = {
val s = settings
log("eval(): settings = " + s)
val lines = ILoop.runForTranscript(code, s, inSession = inSession).lines
(if (welcoming) {
val welcome = "(Welcome to Scala).*".r
//val welcome = Regex.quote(header.lines.next).r
//val version = "(.*version).*".r // version on separate line?
//var inHead = false
lines map {
//case s @ welcome() => inHead = true ; s
//case version(s) if inHead => inHead = false ; s
case welcome(s) => s
case s => s
}
} else {
lines drop header.lines.size
}) map normalize
}
def show() = eval() foreach println
}
/** Retain and normalize the welcome message. */
trait Welcoming { this: ReplTest =>
override def welcoming = true
}
/** Run a REPL test from a session transcript.
* The `session` should be a triple-quoted String starting
* with the `Type in expressions` message and ending
* after the final `prompt`, including the last space.
*/
abstract class SessionTest extends ReplTest {
/** Session transcript, as a triple-quoted, multiline, marginalized string. */
def session: String
/** Expected output, as an iterator, optionally marginally stripped. */
def expected = if (stripMargins) session.stripMargin.lines else session.lines
/** Override with false if we should not strip margins because of leading continuation lines. */
def stripMargins: Boolean = true
/** Analogous to stripMargins, don't mangle continuation lines on echo. */
override def inSession: Boolean = true
/** Code is the command list culled from the session (or the expected session output).
* Would be nicer if code were lazy lines so you could generate arbitrarily long text.
* Retain user input: prompt lines and continuations, without the prefix; or pasted text plus ctl-D.
*/
import SessionTest._
lazy val pasted = input(prompt)
override final def code = pasted findAllMatchIn (expected mkString ("", "\n", "\n")) map {
case pasted(null, null, prompted) =>
def continued(m: Match): Option[String] = m match {
case margin(text) => Some(text)
case _ => None
}
margin.replaceSomeIn(prompted, continued)
case pasted(cmd, pasted, null) =>
cmd + pasted + "\u0004"
} mkString
// Just the last line of the interactive prompt
def prompt = "scala> "
/** Default test is to compare expected and actual output and emit the diff on a failed comparison. */
override def show() = {
val evaled = eval().toList
val wanted = expected.toList
if (evaled.size != wanted.size) Console println s"Expected ${wanted.size} lines, got ${evaled.size}"
if (evaled != wanted) Console print nest.FileManager.compareContents(wanted, evaled, "expected", "actual")
}
}
object SessionTest {
// \R for line break is Java 8, \v for vertical space might suffice
def input(prompt: String) = s"""(?m)^$prompt(:pa.*\u000A)// Entering paste mode.*\u000A\u000A((?:.*\u000A)*)\u000A// Exiting paste mode.*\u000A|^scala> (.*\u000A(?:\\s*\\| .*\u000A)*)""".r
val margin = """(?m)^\s*\| (.*)$""".r
}
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