/
ILoop.scala
1095 lines (967 loc) · 40.1 KB
/
ILoop.scala
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/*
* Scala (https://www.scala-lang.org)
*
* Copyright EPFL and Lightbend, Inc.
*
* Licensed under Apache License 2.0
* (http://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
// Copyright 2005-2017 LAMP/EPFL and Lightbend, Inc.
package scala.tools.nsc.interpreter
package shell
import java.io.{BufferedReader, PrintWriter}
import java.nio.file.{Files, Path => JPath}
import java.util.concurrent.TimeUnit
import scala.PartialFunction.cond
import scala.Predef.{println => _, _}
import scala.annotation.tailrec
import scala.jdk.CollectionConverters._
import scala.language.implicitConversions
import scala.reflect.classTag
import scala.reflect.internal.util.{BatchSourceFile, NoPosition}
import scala.reflect.io.{AbstractFile, Directory, File, Path}
import scala.sys.process.Parser.tokenize
import scala.tools.asm.ClassReader
import scala.tools.nsc.Settings
import scala.tools.nsc.util.{stackTraceString, stringFromStream}
import scala.tools.nsc.interpreter.{AbstractOrMissingHandler, Repl, IMain, Phased, jline}
import scala.tools.nsc.interpreter.Results.{Error, Incomplete, Success}
import scala.tools.nsc.interpreter.StdReplTags._
import scala.util.chaining._
/** The Scala interactive shell. This part provides the user interface,
* with evaluation and auto-complete handled by IMain.
*
* There should be no direct dependency of this code on the compiler;
* it should all go through the `intp` reference to the interpreter,
* or maybe eventually even over the wire to a remote compiler.
*/
class ILoop(config: ShellConfig, inOverride: BufferedReader = null,
protected val out: PrintWriter = new PrintWriter(Console.out, true)) extends LoopCommands {
import config._
// If set before calling run(), the provided interpreter will be used
// (until a destructive reset command is issued -- TODO: delegate resetting to the repl)
// Set by createInterpreter, closeInterpreter (and CompletionTest)
var intp: Repl = _
def Repl(config: ShellConfig, interpreterSettings: Settings, out: PrintWriter) =
new IMain(interpreterSettings, None, interpreterSettings, new ReplReporterImpl(config, interpreterSettings, out))
def global = intp.asInstanceOf[IMain].global
// Set by run and interpretAllFrom (to read input from file).
private var in: InteractiveReader = _
// TODO: the new interface should make settings a ctor arg of ILoop,
// so that this can be a lazy val
private lazy val defaultIn: InteractiveReader =
if (batchMode) SimpleReader(batchText)
else if (inOverride != null) SimpleReader(inOverride, out, completion(new Accumulator), interactive = true)
else if (haveInteractiveConsole) {
val accumulator = new Accumulator
jline.Reader(config, intp, completion(accumulator), accumulator)
}
else SimpleReader()
private val interpreterInitialized = new java.util.concurrent.CountDownLatch(1)
def createTempDirectory(): JPath = Files.createTempDirectory("scala-repl").tap(_.toFile().deleteOnExit())
// TODO: move echo and friends to ReplReporterImpl
// When you know you are most likely breaking into the middle
// of a line being typed. This softens the blow.
protected def echoAndRefresh(msg: String) = {
echo("\n" + msg)
in.redrawLine()
}
protected var mum = false
protected def echo(msg: String) = if (!mum || isReplDebug) {
out println msg
out.flush()
}
// turn off our echo
def echoOff[A](op: => A): A = {
val saved = mum
mum = true
try op finally mum = saved
}
private def printShellInterrupt() = out.print(ShellConfig.InterruptedString)
protected def asyncMessage(msg: String): Unit = {
if (isReplInfo || isReplPower)
echoAndRefresh(msg)
}
override def echoCommandMessage(msg: String): Unit = {
intp.reporter.withoutTruncating { intp.reporter.printMessage(msg) }
}
import scala.tools.nsc.interpreter.ReplStrings.{words, string2codeQuoted}
def welcome = enversion(welcomeString)
/** Print a welcome message! */
def printWelcome(): Unit = {
replinfo(s"[info] started at ${new java.util.Date}")
if (!welcome.isEmpty) echo(welcome)
}
def history = in.history
/** A reverse list of commands to replay if the user requests a :replay */
var replayCommandStack: List[String] = Nil
/** A list of commands to replay if the user requests a :replay */
def replayCommands = replayCommandStack.reverse
/** Record a command for replay should the user request a :replay */
def addReplay(cmd: String) = replayCommandStack ::= cmd
def savingReplayStack[T](body: => T): T = {
val saved = replayCommandStack
try body
finally replayCommandStack = saved
}
/** Close the interpreter and set the var to null.
*
* Used by sbt.
*/
def closeInterpreter(): Unit = {
if (intp ne null) {
intp.close()
intp = null
}
if (in ne null) {
in.close()
in = null
}
}
/** Create a new interpreter.
*
* Used by sbt.
*/
def createInterpreter(interpreterSettings: Settings): Unit = {
intp = Repl(config, interpreterSettings, out)
}
/** Show the history */
lazy val historyCommand = new LoopCommand("history", "show the history (optional num is commands to show)", None) {
override def usage = "[num]"
def defaultLines = 20
def apply(line: String): Result = {
if (history eq NoHistory)
return "No history available."
val xs = words(line)
val current = history.index
val count = try xs.head.toInt catch { case _: Exception => defaultLines }
val lines = history.asStrings takeRight count
val offset = current - lines.size + 1
for ((line, index) <- lines.zipWithIndex)
echo("%3d %s".format(index + offset, line))
}
}
/** Search the history */
def searchHistory(_cmdline: String): Unit = {
val cmdline = _cmdline.toLowerCase
val offset = history.index - history.size + 1
for ((line, index) <- history.asStrings.zipWithIndex ; if line.toLowerCase contains cmdline)
echo("%d %s".format(index + offset, line))
}
import LoopCommand.{ cmd, nullary, cmdWithHelp }
/** Standard commands **/
lazy val standardCommands = List(
cmd("help", "[command]", "print this summary or command-specific help", helpCommand),
cmd("completions", "<string>", "output completions for the given string", completionsCommand),
// TODO maybe just drop these commands, as jline subsumes them -- before reenabling, finish scala.tools.nsc.interpreter.jline.HistoryAdaptor
//cmd("edit", "<id>|<line>", "edit history", editCommand),
//historyCommand,
//cmd("h?", "<string>", "search the history", searchHistory),
cmd("imports", "[name name ...]", "show import history, identifying sources of names", importsCommand),
cmd("implicits", "[-v]", "show the implicits in scope", implicitsCommand),
cmd("javap", "<path|class>", "disassemble a file or class name", javapCommand),
cmd("line", "<id>|<line>", "place line(s) at the end of history", lineCommand),
cmd("load", "<path>", "interpret lines in a file", loadCommand, fileCompletion),
cmd("paste", "[-raw] [path]", "enter paste mode or paste a file", pasteCommand, fileCompletion),
nullary("power", "enable power user mode", () => powerCmd()),
nullary("quit", "exit the REPL", () => Result(keepRunning = false, None)),
cmd("replay", "[options]", "reset the REPL and replay all previous commands", replayCommand, settingsCompletion),
cmd("require", "<path>", "add a jar to the classpath", require),
cmd("reset", "[options]", "reset the REPL to its initial state, forgetting all session entries", resetCommand, settingsCompletion),
cmd("save", "<path>", "save replayable session to a file", saveCommand, fileCompletion),
shCommand,
cmd("settings", "<options>", "update compiler options, if possible; see reset", changeSettings, settingsCompletion),
nullary("silent", "disable/enable automatic printing of results", () => verbosity()),
cmd("type", "[-v] <expr>", "display the type of an expression without evaluating it", typeCommand),
cmdWithHelp("kind", kindUsage, "display the kind of a type. see also :help kind", Some(kindCommandDetailedHelp), kindCommand),
nullary("warnings", "show the suppressed warnings from the most recent line which had any", () => warningsCommand())
)
/** Power user commands */
lazy val powerCommands: List[LoopCommand] = List(
cmd("phase", "<phase>", "set the implicit phase for power commands", phaseCommand)
)
// complete filename
val fileCompletion: Completion = new Completion {
val emptyWord = """(\s+)$""".r.unanchored
val directorily = """(\S*/)$""".r.unanchored
val trailingWord = """(\S+)$""".r.unanchored
def listed(buffer: String, i: Int, dir: Option[Path]) =
dir.filter(_.isDirectory)
.map(d => CompletionResult(buffer, i, d.toDirectory.list.map(x => CompletionCandidate(x.name)).toList))
.getOrElse(NoCompletions)
def listedIn(dir: Directory, name: String) = dir.list.filter(_.name.startsWith(name)).map(_.name).toList
def complete(buffer: String, cursor: Int, filter: Boolean): CompletionResult =
buffer.substring(0, cursor) match {
case emptyWord(s) => listed(buffer, cursor, Directory.Current)
case directorily(s) => listed(buffer, cursor, Option(Path(s)))
case trailingWord(s) =>
val f = File(s)
val (i, maybes) =
if (f.isFile) (cursor - s.length, List(f.toAbsolute.path))
else if (f.isDirectory) (cursor - s.length, List(s"${f.toAbsolute.path}/"))
else if (f.parent.exists) (cursor - f.name.length, listedIn(f.parent.toDirectory, f.name))
else (-1, Nil)
if (maybes.isEmpty) NoCompletions else CompletionResult(buffer, i, maybes.map(CompletionCandidate(_)))
case _ => NoCompletions
}
}
// complete settings name
val settingsCompletion: Completion = new Completion {
val trailingWord = """(\S+)$""".r.unanchored
def complete(buffer: String, cursor: Int, filter: Boolean): CompletionResult = {
buffer.substring(0, cursor) match {
case trailingWord(s) =>
val maybes = intp.visibleSettings.filter(x => if (filter) x.name.startsWith(s) else true).map(_.name)
.filterNot(cond(_) { case "-"|"-X"|"-Y" => true }).sorted
if (maybes.isEmpty) NoCompletions
else CompletionResult(buffer, cursor - s.length, maybes.map(CompletionCandidate(_)), "", "")
case _ => NoCompletions
}
}
}
private def importsCommand(line: String): Result =
intp.importsCommandInternal(words(line)) mkString ("\n")
private def implicitsCommand(line: String): Result = {
val (implicits, res) = intp.implicitsCommandInternal(line)
implicits foreach echoCommandMessage
res
}
// Still todo: modules.
private def typeCommand(line0: String): Result = {
line0.trim match {
case "" => ":type [-v] <expression>. see also :help kind"
case s =>
val verbose = s startsWith "-v "
val (sig, verboseSig) = intp.typeCommandInternal(s.stripPrefix("-v ").trim, verbose)
if (verbose) echoCommandMessage("// Type signature")
echoCommandMessage(sig)
if (!verboseSig.isEmpty) echoCommandMessage("\n// Internal Type structure\n"+ verboseSig)
()
}
}
private lazy val kindUsage: String = "[-v] <type>"
private lazy val kindCommandDetailedHelp: String =
s""":kind $kindUsage
|Displays the kind of a given type.
|
| -v Displays verbose info.
|
|"Kind" is a word used to classify types and type constructors
|according to their level of abstractness.
|
|Concrete, fully specified types such as `Int` and `Option[Int]`
|are called "proper types" and denoted as `A` using Scala
|notation, or with the `*` symbol.
|
| scala> :kind Option[Int]
| Option[Int]'s kind is A
|
|In the above, `Option` is an example of a first-order type
|constructor, which is denoted as `F[A]` using Scala notation, or
|* -> * using the star notation. `:kind` also includes variance
|information in its output, so if we ask for the kind of `Option`,
|we actually see `F[+A]`:
|
| scala> :k -v Option
| Option's kind is F[+A]
| * -(+)-> *
| This is a type constructor: a 1st-order-kinded type.
|
|When you have more complicated types, `:kind` can be used to find
|out what you need to pass in.
|
| scala> trait ~>[-F1[_], +F2[_]] {}
| scala> :kind ~>
| ~>'s kind is X[-F1[A1],+F2[A2]]
|
|This shows that `~>` accepts something of `F[A]` kind, such as
|`List` or `Vector`. It's an example of a type constructor that
|abstracts over type constructors, also known as a higher-order
|type constructor or a higher-kinded type.
|""".stripMargin
private def kindCommand(expr: String): Result = {
expr.trim match {
case "" => s":kind $kindUsage"
case s => intp.kindCommandInternal(s.stripPrefix("-v ").trim, verbose = s.startsWith("-v "))
}
}
private def warningsCommand(): Result = {
if (intp.lastWarnings.isEmpty)
"Can't find any cached warnings."
else
intp.lastWarnings foreach { case (pos, msg) => intp.reporter.warning(pos, msg) }
}
private def javapCommand(line: String): Result = {
def handle(results: List[Javap.JpResult]): Result =
results match {
case Nil => ()
case res :: rest =>
if (res.isError) res.value.toString
else {
res.show()
handle(rest)
}
}
handle(Javap(intp)(words(line): _*))
}
private def pathToPhaseWrapper = intp.originalPath("$r") + ".phased.atCurrent"
private def phaseCommand(name: String): Result = {
val phased: Phased = intp.power.phased
import phased.NoPhaseName
if (name == "clear") {
phased.set(NoPhaseName)
intp.clearExecutionWrapper()
"Cleared active phase."
}
else if (name == "") phased.get match {
case NoPhaseName => "Usage: :phase <expr> (e.g. typer, erasure.next, erasure+3)"
case ph => "Active phase is '%s'. (To clear, :phase clear)".format(phased.get)
}
else {
val what = phased.parse(name)
if (what.isEmpty || !phased.set(what))
"'" + name + "' does not appear to represent a valid phase."
else {
intp.setExecutionWrapper(pathToPhaseWrapper)
val activeMessage =
if (what.toString.length == name.length) "" + what
else "%s (%s)".format(what, name)
"Active phase is now: " + activeMessage
}
}
}
/** Available commands */
def commands: List[LoopCommand] = standardCommands ++ (
if (isReplPower) powerCommands else Nil
)
val replayQuestionMessage =
"""|That entry seems to have slain the compiler. Shall I replay
|your session? I can re-run each line except the last one.
|[y/n]
""".trim.stripMargin
private val crashRecovery: PartialFunction[Throwable, Boolean] = {
case ex: Throwable =>
val (err, explain) = (
if (intp.initializeComplete)
(stackTraceString(ex), "")
else
(ex.getMessage, "The compiler did not initialize.\n")
)
echo(err)
ex match {
case _: NoSuchMethodError | _: NoClassDefFoundError =>
echo("\nUnrecoverable error.")
throw ex
case _ =>
def fn(): Boolean =
try in.readYesOrNo(explain + replayQuestionMessage, { echo("\nYou must enter y or n.") ; fn() })
catch { case _: RuntimeException => false }
if (fn()) replay()
else echo("\nAbandoning crashed session.")
}
true
}
// after process line, OK continue, ERR break, or EOF all done
object LineResults extends Enumeration {
type LineResult = Value
val EOF, ERR, OK = Value
}
import LineResults.LineResult
// Notice failure to create compiler
def command(line: String): Result =
if (line startsWith ":") colonCommand(line)
else if (!intp.initializeCompiler()) Result(keepRunning = false, None)
else Result(keepRunning = true, interpretStartingWith(line))
// return false if repl should exit
def processLine(line: String): Boolean = {
// Long timeout here to avoid test failures under heavy load.
interpreterInitialized.await(10, TimeUnit.MINUTES)
val res = command(line)
res.lineToRecord.foreach(addReplay)
res.keepRunning
}
lazy val prompt = encolor(promptText)
// R as in REPL
def readOneLine(): String = {
out.flush()
in.reset()
in.readLine(prompt)
}
// L as in REPL
@tailrec final def loop(): LineResult =
readOneLine() match {
case null => LineResults.EOF
case s if (try processLine(s) catch crashRecovery) => loop()
case _ => LineResults.ERR
}
/** interpret all lines from a specified file */
def interpretAllFrom(file: File, verbose: Boolean = false): Unit = {
// Saving `in` is not factored out because we don't want to encourage doing this everywhere (the new design shouldn't rely on mutation)
val savedIn = in
try
savingReplayStack {
// `applyReader` will `close()` `fileReader` before returning,
// so, keep `in` pointing at `fileReader` until that's done.
file applyReader { fileReader =>
echo(s"Loading $file...")
in = SimpleReader(fileReader, out, interactive = verbose, verbose = verbose)
loop()
}
}
finally in = savedIn
}
private def changeSettings(line: String): Result = {
val intp = this.intp
def showSettings() = for (s <- { intp.userSetSettings }.toSeq.sorted(Ordering.ordered[intp.Setting])) echo(s.toString)
if (line.isEmpty) showSettings()
else { intp.updateSettings(words(line)) ; () }
}
/** create a new interpreter and replay the given commands */
def replayCommand(line: String): Unit = {
def run(destructive: Boolean): Unit = {
if (destructive) createInterpreter(intp.settings) else reset()
replay()
}
if (line.isEmpty) run(destructive = false)
else if (intp.updateSettings(words(line))) run(destructive = true)
}
/** Announces as it replays. */
def replay(): Unit = {
if (replayCommandStack.isEmpty)
echo("Nothing to replay.")
else {
val reprompt = "replay> "
intp.reporter.indenting(reprompt.length) {
for (cmd <- replayCommands) {
echo(s"$reprompt$cmd")
command(cmd)
echo("") // flush because maybe cmd will have its own output
}
}
}
}
/** `reset` the interpreter in an attempt to start fresh.
* Supplying settings creates a new compiler.
*/
def resetCommand(line: String): Unit = {
def run(destructive: Boolean): Unit = {
echo("Resetting REPL state.")
if (replayCommandStack.nonEmpty) {
echo("Forgetting this session history:\n")
replayCommands foreach echo
echo("")
replayCommandStack = Nil
}
if (intp.namedDefinedTerms.nonEmpty)
echo("Forgetting all expression results and named terms: " + intp.namedDefinedTerms.mkString(", "))
if (intp.definedTypes.nonEmpty)
echo("Forgetting defined types: " + intp.definedTypes.mkString(", "))
if (destructive) createInterpreter(intp.settings) else reset()
}
if (line.isEmpty) run(destructive = false)
else if (intp.updateSettings(words(line))) run(destructive = true)
}
/** Resets without announcements. */
def reset(): Unit = {
intp.reset()
unleashAndSetPhase()
}
def lineCommand(what: String): Result = editCommand(what, None)
def completion(accumulator: Accumulator = new Accumulator) = {
val rc = new ReplCompletion(intp, accumulator)
MultiCompletion(shellCompletion, rc)
}
val shellCompletion = new Completion {
override def complete(buffer: String, cursor: Int, filter: Boolean) =
if (buffer.startsWith(":")) colonCompletion(buffer, cursor).complete(buffer, cursor, filter)
else NoCompletions
}
// this may be used by editors that embed the REPL (e.g. emacs) to present completions themselves;
// it's also used by ReplTest
def completionsCommand(what: String): Result = {
val completions = in.completion.complete(what, what.length)
val candidates = completions.candidates.filterNot(_.isUniversal)
// condition here is a bit weird because of the weird hack we have where
// the first candidate having an empty defString means it's not really
// completion, but showing the method signature instead
if (candidates.headOption.exists(_.name.nonEmpty)) {
val prefix =
if (completions == NoCompletions) ""
else what.substring(0, completions.cursor)
// hvesalai (emacs sbt-mode maintainer) says it's important to echo only once and not per-line
echo(
candidates.map(c => s"[completions] $prefix${c.name}")
.mkString("\n")
)
}
Result.default // never record completions
}
// :edit id or :edit line
def editCommand(what: String): Result = editCommand(what, ShellConfig.EDITOR)
def editCommand(what: String, editor: Option[String]): Result = {
def diagnose(code: String): Unit = paste.incomplete("The edited code is incomplete!\n", "<edited>", code)
def edit(text: String): Result = editor match {
case Some(ed) =>
val tmp = File.makeTemp()
tmp.writeAll(text)
try {
val pr = new ProcessResult(s"$ed ${tmp.path}")
pr.exitCode match {
case 0 =>
tmp.safeSlurp() match {
case Some(edited) if edited.trim.isEmpty => echo("Edited text is empty.")
case Some(edited) =>
echo(edited.linesIterator map ("+" + _) mkString "\n")
val res = intp interpret edited
if (res == Incomplete) diagnose(edited)
else {
history.historicize(edited)
Result(lineToRecord = Some(edited), keepRunning = true)
}
case None => echo("Can't read edited text. Did you delete it?")
}
case x => echo(s"Error exit from $ed ($x), ignoring")
}
} finally {
tmp.delete()
}
case None =>
if (history.historicize(text)) echo("Placing text in recent history.")
else echo(f"No EDITOR defined and you can't change history, echoing your text:%n$text")
}
// if what is a number, use it as a line number or range in history
def isNum = what forall (c => c.isDigit || c == '-' || c == '+')
// except that "-" means last value
def isLast = (what == "-")
if (isLast || !isNum) {
intp.requestDefining(if (isLast) intp.mostRecentVar else what) match {
case Some(req) => edit(req.line)
case None => echo(s"No symbol in scope: $what")
}
} else try {
val s = what
// line 123, 120+3, -3, 120-123, 120-, note -3 is not 0-3 but (cur-3,cur)
val (start, len) =
if ((s indexOf '+') > 0) {
val (a,b) = s splitAt (s indexOf '+')
(a.toInt, b.drop(1).toInt)
} else {
(s indexOf '-') match {
case -1 => (s.toInt, 1)
case 0 => val n = s.drop(1).toInt ; (history.index - n, n)
case _ if s.last == '-' => val n = s.init.toInt ; (n, history.index - n)
case i => val n = s.take(i).toInt ; (n, s.drop(i+1).toInt - n)
}
}
val index = (start - 1) max 0
val text = history.asStrings(index, index + len) mkString "\n"
edit(text)
} catch {
case _: NumberFormatException => echo(s"Bad range '$what'")
echo("Use line 123, 120+3, -3, 120-123, 120-, note -3 is not 0-3 but (cur-3,cur)")
}
}
/** fork a shell and run a command */
lazy val shCommand = new LoopCommand("sh", "run a shell command (result is implicitly => List[String])", None) {
override def usage = "<command line>"
def apply(line: String): Result = line match {
case "" => showUsage()
case _ =>
val toRun = s"new ${classOf[ProcessResult].getName}(${string2codeQuoted(line)})"
intp interpret toRun
()
}
}
def withFile[A](filename: String)(action: File => A): Option[A] = intp.withLabel(filename) {
Some(File(filename)).filter(_.exists).map(action).tap(res =>
if (res.isEmpty) intp.reporter.warning(NoPosition, s"File `$filename` does not exist.")
)
}
def loadCommand(arg: String): Result = {
def run(file: String, args: List[String], verbose: Boolean) = withFile(file) { f =>
intp.interpret(s"val args: Array[String] = ${ args.map("\"" + _ + "\"").mkString("Array(", ",", ")") }")
interpretAllFrom(f, verbose)
Result recording s":load $arg"
} getOrElse Result.default
tokenize(arg) match {
case "-v" :: file :: rest => run(file, rest, verbose = true)
case file :: rest => run(file, rest, verbose = false)
case _ => echo("usage: :load -v file") ; Result.default
}
}
def saveCommand(filename: String): Result = (
if (filename.isEmpty) echo("File name is required.")
else if (replayCommandStack.isEmpty) echo("No replay commands in session")
else File(filename).printlnAll(replayCommands: _*)
)
/** Adds jar file to the current classpath. Jar will only be added if it
* does not contain classes that already exist on the current classpath.
*
* Importantly, `require` adds jars to the classpath ''without'' resetting
* the state of the interpreter. This is in contrast to `replay` which can
* be used to add jars to the classpath and which creates a new instance of
* the interpreter and replays all interpreter expressions.
*/
def require(arg: String): Unit = {
val f = File(arg).normalize
val jarFile = AbstractFile.getDirectory(new java.io.File(arg))
if (jarFile == null) {
echo(s"Cannot load '$arg'")
return
}
def flatten(f: AbstractFile): Iterator[AbstractFile] =
if (f.isClassContainer) f.iterator.flatMap(flatten)
else Iterator(f)
val entries = flatten(jarFile)
def classNameOf(classFile: AbstractFile): String = {
val input = classFile.input
try {
val reader = new ClassReader(input)
reader.getClassName.replace('/', '.')
} finally {
input.close()
}
}
def alreadyDefined(clsName: String) = intp.classLoader.tryToLoadClass(clsName).isDefined
val existingClass = entries.filter(_.hasExtension("class")).map(classNameOf).find(alreadyDefined)
if (!f.exists) echo(s"The path '$f' doesn't seem to exist.")
else if (existingClass.nonEmpty) echo(s"The path '$f' cannot be loaded, it contains a classfile that already exists on the classpath: ${existingClass.get}")
else {
intp.addUrlsToClassPath(f.toURI.toURL)
echo("Added '%s' to classpath.".format(f.path))
repldbg("Added '%s'. Your new classpath is:\n\"%s\"".format(f.path, intp.classPathString))
}
}
def powerCmd(): Result = {
if (isReplPower) "Already in power mode."
else enablePowerMode(isDuringInit = false)
}
def enablePowerMode(isDuringInit: Boolean) = {
config.power setValue true
unleashAndSetPhase()
asyncEcho(isDuringInit, powerBannerMessage)
}
private def powerBannerMessage: String =
powerBanner.option map {
case f if f.getName == "classic" => intp.power.classic
case f => Files.readAllLines(f.toPath).asScala.mkString("\n")
} getOrElse intp.power.banner
private def unleashAndSetPhase() =
if (isReplPower) {
intp.power.unleash()
intp.reporter.suppressOutput {
(powerInitCode.option
map (f => Files.readAllLines(f.toPath).asScala.toList)
getOrElse intp.power.initImports
foreach intp.interpret)
phaseCommand("typer") // Set the phase to "typer"
}
}
def asyncEcho(async: Boolean, msg: => String): Unit = {
if (async) asyncMessage(msg)
else echo(msg)
}
def verbosity() = {
intp.reporter.togglePrintResults()
replinfo(s"Result printing is ${ if (intp.reporter.printResults) "on" else "off" }.")
}
private def readWhile(cond: String => Boolean) = {
Iterator continually in.readLine("") takeWhile (x => x != null && cond(x))
}
/* :paste -raw file
* or
* :paste < EOF
* your code
* EOF
* :paste <~ EOF
* ~your code
* EOF
* and optionally
* :paste -java
*/
def pasteCommand(arg: String): Result = {
var shouldReplay: Option[String] = None
var label = "<pastie>"
def result = Result(keepRunning = true, shouldReplay)
val (flags, args) = tokenize(arg).span(_.startsWith("-"))
val raw = flags.contains("-raw")
val java = flags.contains("-java")
val badFlags = flags.filterNot(List("-raw", "-java").contains)
def usage() = echo("usage: :paste [-raw | -java] file | < EOF")
def pasteFile(name: String): String = {
label = name
withFile(name) { f =>
shouldReplay = Some(s":paste $arg")
f.slurp().trim().tap(s => echo(if (s.isEmpty) s"File contains no code: $f" else s"Pasting file $f..."))
}.getOrElse("")
}
def pasteWith(margin: String, eof: Option[String]): String = {
echo(s"// Entering paste mode (${ eof getOrElse "ctrl-D" } to finish)\n")
in.withSecondaryPrompt("") {
val delimiter = eof.orElse(config.pasteDelimiter.option)
def atEOF(s: String) = delimiter.map(_ == s).getOrElse(false)
val input = readWhile(s => !atEOF(s)).mkString("\n")
margin match {
case "" => input.trim
case "-" => input.linesIterator.map(_.trim).mkString("\n")
case _ => input.stripMargin(margin.head).trim
}
}
}
def interpretCode(code: String) = {
echo("// Exiting paste mode... now interpreting.")
if (intp.withLabel(label)(intp.interpret(code)) == Incomplete)
paste.incomplete("The pasted code is incomplete!", label, code)
}
def compileCode(code: String) = {
echo("// Exiting paste mode... now compiling with scalac.")
paste.compilePaste(label = label, code = code)
}
def compileJava(code: String): Unit = {
def pickLabel() = {
val gstable = global
val jparser = gstable.newJavaUnitParser(gstable.newCompilationUnit(code = code))
val result = jparser.parse().collect {
case gstable.ClassDef(mods, className, _, _) if mods.isPublic => className
}
result.headOption
}
echo("// Exiting paste mode... now compiling with javac.")
pickLabel() match {
case Some(className) =>
label = s"${className.decoded}"
val out = createTempDirectory()
JavacTool(out, intp.classLoader).compile(label, code) match {
case Some(errormsg) => echo(s"Compilation failed! $errormsg")
case None => intp.addUrlsToClassPath(out.toUri().toURL())
}
case _ =>
echo(s"No class detected in source!")
}
}
def dispatch(code: String): Unit =
if (code.isEmpty)
echo("// Exiting paste mode... nothing to compile.")
else
intp.reporter.indenting(0) {
if (java) compileJava(code)
else if (raw || paste.isPackaged(code)) compileCode(code)
else interpretCode(code)
}
args match {
case _ if badFlags.nonEmpty => usage()
case name :: Nil if !name.startsWith("<") => dispatch(pasteFile(name))
case Nil => dispatch(pasteWith("", None))
case here :: Nil => dispatch(pasteWith(here.slice(1, 2), None))
case here :: eof :: Nil if here.startsWith("<") => dispatch(pasteWith(here.slice(1, 2), Some(eof)))
case _ => usage()
}
result
}
private object paste extends Pasted(config.promptText, encolor(continueText), continueText) {
def interpret(line: String) = intp interpret line
def echo(message: String) = ILoop.this echo message
val leadingElement = raw"(?s)\s*(package\s|/)".r
def isPackaged(code: String): Boolean = {
leadingElement.findPrefixMatchOf(code)
.map(m => if (m.group(1) == "/") intp.isPackaged(code) else true)
.getOrElse(false)
}
// if input is incomplete, wrap and compile for diagnostics.
def incomplete(message: String, label: String, code: String): Boolean = {
echo(message)
val errless = intp.compileSources(new BatchSourceFile(label, s"object pastel {\n$code\n}"))
if (errless) echo("No error found in incomplete source.")
errless
}
def compilePaste(label: String, code: String): Boolean = {
val errless = intp.compileSources(new BatchSourceFile(label, code))
if (!errless) echo("There were compilation errors!")
errless
}
}
private object invocation {
// used during loop
def unapply(line: String): Boolean =
intp.mostRecentVar != "" && Parsed.looksLikeInvocation(line)
}
private val lineComment = """\s*//.*""".r // all comment
/** Interpret expressions starting with the first line.
* Read lines until a complete compilation unit is available
* or until a syntax error has been seen. If a full unit is
* read, go ahead and interpret it. Return the full string
* to be recorded for replay, if any.
*/
final def interpretStartingWith(start: String): Option[String] = {
def loop(): Option[String] = {
val code = in.accumulator.toString
intp.interpret(code) match {
case Error => None
case Success => Some(code)
case Incomplete if in.interactive && code.endsWith("\n\n") =>
echo("You typed two blank lines. Starting a new command.")
None
case Incomplete =>
in.readLine(paste.ContinuePrompt) match {
case null =>
// partial input with no input forthcoming,
// so ask again for parse error message.
// This happens at EOF of a :load file.
intp.interpretFinally(code)
None
case line => in.accumulator += line ; loop()
}
}
}
start match {
case "" | lineComment() => None // empty or line comment, do nothing
case paste() =>
val pasted = Iterator(start) ++ readWhile(!paste.isPromptOnly(_))
paste.transcript(pasted) match {
case Some(s) => interpretStartingWith(s)
case _ => None
}
case invocation() => in.accumulator += intp.mostRecentVar + start ; loop()
case _ => in.accumulator += start ; loop()
}
}
/**
* Allows to specify custom code to run quietly in the preamble
* @return custom Scala code to run automatically at the startup of the REPL
*/
protected def internalReplAutorunCode(): Seq[String] = Seq.empty
/** Actions to cram in parallel while collecting first user input at prompt.
* Run with output muted both from ILoop and from the intp reporter.
*/
private def interpretPreamble() = {
// Bind intp somewhere out of the regular namespace where
// we can get at it in generated code.
intp.quietBind(intp.namedParam[Repl](s"$$intp", intp)(tagOfRepl, classTag[Repl]))
internalReplAutorunCode().foreach(intp.quietRun)
// Auto-run code via some setting.
(config.replAutorunCode.option
flatMap (f => File(f).safeSlurp())
foreach (intp quietRun _)
)
// power mode setup
if (isReplPower)
enablePowerMode(isDuringInit = true)
for (f <- filesToLoad) {
loadCommand(f)
addReplay(s":load $f")
}
for (f <- filesToPaste) {
pasteCommand(f)
addReplay(s":paste $f")
}
}
/** Start an interpreter with the given settings.
* @return true if successful
*/
def run(interpreterSettings: Settings): Boolean = {
if (!batchMode) printWelcome()
createInterpreter(interpreterSettings)
in = defaultIn
intp.reporter.withoutPrintingResults(intp.withSuppressedSettings {
intp.initializeCompiler()
interpreterInitialized.countDown() // TODO: move to reporter.compilerInitialized ?
if (intp.reporter.hasErrors) {
echo("Interpreter encountered errors during initialization!")
throw new InterruptedException
}
echoOff { interpretPreamble() }
})
// start full loop (if initialization was successful)
try
loop() match {
case LineResults.EOF if in.interactive => printShellInterrupt(); true
case LineResults.ERR => false
case _ => true
}
catch AbstractOrMissingHandler()
finally closeInterpreter()
}