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Posted to commits@spark.apache.org by pw...@apache.org on 2014/11/07 20:31:29 UTC
[07/20] spark git commit: Scala 2.11 support with repl and all build
changes.
http://git-wip-us.apache.org/repos/asf/spark/blob/4af9de7d/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkIMain.scala
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diff --git a/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkIMain.scala b/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkIMain.scala
new file mode 100644
index 0000000..1bb62c8
--- /dev/null
+++ b/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkIMain.scala
@@ -0,0 +1,1319 @@
+/* NSC -- new Scala compiler
+ * Copyright 2005-2013 LAMP/EPFL
+ * @author Martin Odersky
+ */
+
+package scala
+package tools.nsc
+package interpreter
+
+import PartialFunction.cond
+import scala.language.implicitConversions
+import scala.beans.BeanProperty
+import scala.collection.mutable
+import scala.concurrent.{ Future, ExecutionContext }
+import scala.reflect.runtime.{ universe => ru }
+import scala.reflect.{ ClassTag, classTag }
+import scala.reflect.internal.util.{ BatchSourceFile, SourceFile }
+import scala.tools.util.PathResolver
+import scala.tools.nsc.io.AbstractFile
+import scala.tools.nsc.typechecker.{ TypeStrings, StructuredTypeStrings }
+import scala.tools.nsc.util.{ ScalaClassLoader, stringFromReader, stringFromWriter, StackTraceOps }
+import scala.tools.nsc.util.Exceptional.unwrap
+import javax.script.{AbstractScriptEngine, Bindings, ScriptContext, ScriptEngine, ScriptEngineFactory, ScriptException, CompiledScript, Compilable}
+
+/** An interpreter for Scala code.
+ *
+ * The main public entry points are compile(), interpret(), and bind().
+ * The compile() method loads a complete Scala file. The interpret() method
+ * executes one line of Scala code at the request of the user. The bind()
+ * method binds an object to a variable that can then be used by later
+ * interpreted code.
+ *
+ * The overall approach is based on compiling the requested code and then
+ * using a Java classloader and Java reflection to run the code
+ * and access its results.
+ *
+ * In more detail, a single compiler instance is used
+ * to accumulate all successfully compiled or interpreted Scala code. To
+ * "interpret" a line of code, the compiler generates a fresh object that
+ * includes the line of code and which has public member(s) to export
+ * all variables defined by that code. To extract the result of an
+ * interpreted line to show the user, a second "result object" is created
+ * which imports the variables exported by the above object and then
+ * exports members called "$eval" and "$print". To accomodate user expressions
+ * that read from variables or methods defined in previous statements, "import"
+ * statements are used.
+ *
+ * This interpreter shares the strengths and weaknesses of using the
+ * full compiler-to-Java. The main strength is that interpreted code
+ * behaves exactly as does compiled code, including running at full speed.
+ * The main weakness is that redefining classes and methods is not handled
+ * properly, because rebinding at the Java level is technically difficult.
+ *
+ * @author Moez A. Abdel-Gawad
+ * @author Lex Spoon
+ */
+class SparkIMain(@BeanProperty val factory: ScriptEngineFactory, initialSettings: Settings,
+ protected val out: JPrintWriter) extends AbstractScriptEngine with Compilable with SparkImports {
+ imain =>
+
+ setBindings(createBindings, ScriptContext.ENGINE_SCOPE)
+ object replOutput extends ReplOutput(settings.Yreploutdir) { }
+
+ @deprecated("Use replOutput.dir instead", "2.11.0")
+ def virtualDirectory = replOutput.dir
+ // Used in a test case.
+ def showDirectory() = replOutput.show(out)
+
+ private[nsc] var printResults = true // whether to print result lines
+ private[nsc] var totalSilence = false // whether to print anything
+ private var _initializeComplete = false // compiler is initialized
+ private var _isInitialized: Future[Boolean] = null // set up initialization future
+ private var bindExceptions = true // whether to bind the lastException variable
+ private var _executionWrapper = "" // code to be wrapped around all lines
+
+ /** We're going to go to some trouble to initialize the compiler asynchronously.
+ * It's critical that nothing call into it until it's been initialized or we will
+ * run into unrecoverable issues, but the perceived repl startup time goes
+ * through the roof if we wait for it. So we initialize it with a future and
+ * use a lazy val to ensure that any attempt to use the compiler object waits
+ * on the future.
+ */
+ private var _classLoader: util.AbstractFileClassLoader = null // active classloader
+ private val _compiler: ReplGlobal = newCompiler(settings, reporter) // our private compiler
+
+ def compilerClasspath: Seq[java.net.URL] = (
+ if (isInitializeComplete) global.classPath.asURLs
+ else new PathResolver(settings).result.asURLs // the compiler's classpath
+ )
+ def settings = initialSettings
+ // Run the code body with the given boolean settings flipped to true.
+ def withoutWarnings[T](body: => T): T = beQuietDuring {
+ val saved = settings.nowarn.value
+ if (!saved)
+ settings.nowarn.value = true
+
+ try body
+ finally if (!saved) settings.nowarn.value = false
+ }
+
+ /** construct an interpreter that reports to Console */
+ def this(settings: Settings, out: JPrintWriter) = this(null, settings, out)
+ def this(factory: ScriptEngineFactory, settings: Settings) = this(factory, settings, new NewLinePrintWriter(new ConsoleWriter, true))
+ def this(settings: Settings) = this(settings, new NewLinePrintWriter(new ConsoleWriter, true))
+ def this(factory: ScriptEngineFactory) = this(factory, new Settings())
+ def this() = this(new Settings())
+
+ lazy val formatting: Formatting = new Formatting {
+ val prompt = Properties.shellPromptString
+ }
+ lazy val reporter: SparkReplReporter = new SparkReplReporter(this)
+
+ import formatting._
+ import reporter.{ printMessage, printUntruncatedMessage }
+
+ // This exists mostly because using the reporter too early leads to deadlock.
+ private def echo(msg: String) { Console println msg }
+ private def _initSources = List(new BatchSourceFile("<init>", "class $repl_$init { }"))
+ private def _initialize() = {
+ try {
+ // if this crashes, REPL will hang its head in shame
+ val run = new _compiler.Run()
+ assert(run.typerPhase != NoPhase, "REPL requires a typer phase.")
+ run compileSources _initSources
+ _initializeComplete = true
+ true
+ }
+ catch AbstractOrMissingHandler()
+ }
+ private def tquoted(s: String) = "\"\"\"" + s + "\"\"\""
+ private val logScope = scala.sys.props contains "scala.repl.scope"
+ private def scopelog(msg: String) = if (logScope) Console.err.println(msg)
+
+ // argument is a thunk to execute after init is done
+ def initialize(postInitSignal: => Unit) {
+ synchronized {
+ if (_isInitialized == null) {
+ _isInitialized =
+ Future(try _initialize() finally postInitSignal)(ExecutionContext.global)
+ }
+ }
+ }
+ def initializeSynchronous(): Unit = {
+ if (!isInitializeComplete) {
+ _initialize()
+ assert(global != null, global)
+ }
+ }
+ def isInitializeComplete = _initializeComplete
+
+ lazy val global: Global = {
+ if (!isInitializeComplete) _initialize()
+ _compiler
+ }
+
+ import global._
+ import definitions.{ ObjectClass, termMember, dropNullaryMethod}
+
+ lazy val runtimeMirror = ru.runtimeMirror(classLoader)
+
+ private def noFatal(body: => Symbol): Symbol = try body catch { case _: FatalError => NoSymbol }
+
+ def getClassIfDefined(path: String) = (
+ noFatal(runtimeMirror staticClass path)
+ orElse noFatal(rootMirror staticClass path)
+ )
+ def getModuleIfDefined(path: String) = (
+ noFatal(runtimeMirror staticModule path)
+ orElse noFatal(rootMirror staticModule path)
+ )
+
+ implicit class ReplTypeOps(tp: Type) {
+ def andAlso(fn: Type => Type): Type = if (tp eq NoType) tp else fn(tp)
+ }
+
+ // TODO: If we try to make naming a lazy val, we run into big time
+ // scalac unhappiness with what look like cycles. It has not been easy to
+ // reduce, but name resolution clearly takes different paths.
+ object naming extends {
+ val global: imain.global.type = imain.global
+ } with Naming {
+ // make sure we don't overwrite their unwisely named res3 etc.
+ def freshUserTermName(): TermName = {
+ val name = newTermName(freshUserVarName())
+ if (replScope containsName name) freshUserTermName()
+ else name
+ }
+ def isInternalTermName(name: Name) = isInternalVarName("" + name)
+ }
+ import naming._
+
+ object deconstruct extends {
+ val global: imain.global.type = imain.global
+ } with StructuredTypeStrings
+
+ lazy val memberHandlers = new {
+ val intp: imain.type = imain
+ } with SparkMemberHandlers
+ import memberHandlers._
+
+ /** Temporarily be quiet */
+ def beQuietDuring[T](body: => T): T = {
+ val saved = printResults
+ printResults = false
+ try body
+ finally printResults = saved
+ }
+ def beSilentDuring[T](operation: => T): T = {
+ val saved = totalSilence
+ totalSilence = true
+ try operation
+ finally totalSilence = saved
+ }
+
+ def quietRun[T](code: String) = beQuietDuring(interpret(code))
+
+ /** takes AnyRef because it may be binding a Throwable or an Exceptional */
+ private def withLastExceptionLock[T](body: => T, alt: => T): T = {
+ assert(bindExceptions, "withLastExceptionLock called incorrectly.")
+ bindExceptions = false
+
+ try beQuietDuring(body)
+ catch logAndDiscard("withLastExceptionLock", alt)
+ finally bindExceptions = true
+ }
+
+ def executionWrapper = _executionWrapper
+ def setExecutionWrapper(code: String) = _executionWrapper = code
+ def clearExecutionWrapper() = _executionWrapper = ""
+
+ /** interpreter settings */
+ lazy val isettings = new SparkISettings(this)
+
+ /** Instantiate a compiler. Overridable. */
+ protected def newCompiler(settings: Settings, reporter: reporters.Reporter): ReplGlobal = {
+ settings.outputDirs setSingleOutput replOutput.dir
+ settings.exposeEmptyPackage.value = true
+ new Global(settings, reporter) with ReplGlobal { override def toString: String = "<global>" }
+ }
+
+ /** Parent classloader. Overridable. */
+ protected def parentClassLoader: ClassLoader =
+ settings.explicitParentLoader.getOrElse( this.getClass.getClassLoader() )
+
+ /* A single class loader is used for all commands interpreted by this Interpreter.
+ It would also be possible to create a new class loader for each command
+ to interpret. The advantages of the current approach are:
+
+ - Expressions are only evaluated one time. This is especially
+ significant for I/O, e.g. "val x = Console.readLine"
+
+ The main disadvantage is:
+
+ - Objects, classes, and methods cannot be rebound. Instead, definitions
+ shadow the old ones, and old code objects refer to the old
+ definitions.
+ */
+ def resetClassLoader() = {
+ repldbg("Setting new classloader: was " + _classLoader)
+ _classLoader = null
+ ensureClassLoader()
+ }
+ final def ensureClassLoader() {
+ if (_classLoader == null)
+ _classLoader = makeClassLoader()
+ }
+ def classLoader: util.AbstractFileClassLoader = {
+ ensureClassLoader()
+ _classLoader
+ }
+
+ def backticked(s: String): String = (
+ (s split '.').toList map {
+ case "_" => "_"
+ case s if nme.keywords(newTermName(s)) => s"`$s`"
+ case s => s
+ } mkString "."
+ )
+ def readRootPath(readPath: String) = getModuleIfDefined(readPath)
+
+ abstract class PhaseDependentOps {
+ def shift[T](op: => T): T
+
+ def path(name: => Name): String = shift(path(symbolOfName(name)))
+ def path(sym: Symbol): String = backticked(shift(sym.fullName))
+ def sig(sym: Symbol): String = shift(sym.defString)
+ }
+ object typerOp extends PhaseDependentOps {
+ def shift[T](op: => T): T = exitingTyper(op)
+ }
+ object flatOp extends PhaseDependentOps {
+ def shift[T](op: => T): T = exitingFlatten(op)
+ }
+
+ def originalPath(name: String): String = originalPath(name: TermName)
+ def originalPath(name: Name): String = typerOp path name
+ def originalPath(sym: Symbol): String = typerOp path sym
+ def flatPath(sym: Symbol): String = flatOp shift sym.javaClassName
+ def translatePath(path: String) = {
+ val sym = if (path endsWith "$") symbolOfTerm(path.init) else symbolOfIdent(path)
+ sym.toOption map flatPath
+ }
+ def translateEnclosingClass(n: String) = symbolOfTerm(n).enclClass.toOption map flatPath
+
+ private class TranslatingClassLoader(parent: ClassLoader) extends util.AbstractFileClassLoader(replOutput.dir, parent) {
+ /** Overridden here to try translating a simple name to the generated
+ * class name if the original attempt fails. This method is used by
+ * getResourceAsStream as well as findClass.
+ */
+ override protected def findAbstractFile(name: String): AbstractFile =
+ super.findAbstractFile(name) match {
+ case null if _initializeComplete => translatePath(name) map (super.findAbstractFile(_)) orNull
+ case file => file
+ }
+ }
+ private def makeClassLoader(): util.AbstractFileClassLoader =
+ new TranslatingClassLoader(parentClassLoader match {
+ case null => ScalaClassLoader fromURLs compilerClasspath
+ case p => new ScalaClassLoader.URLClassLoader(compilerClasspath, p)
+ })
+
+ // Set the current Java "context" class loader to this interpreter's class loader
+ def setContextClassLoader() = classLoader.setAsContext()
+
+ def allDefinedNames: List[Name] = exitingTyper(replScope.toList.map(_.name).sorted)
+ def unqualifiedIds: List[String] = allDefinedNames map (_.decode) sorted
+
+ /** Most recent tree handled which wasn't wholly synthetic. */
+ private def mostRecentlyHandledTree: Option[Tree] = {
+ prevRequests.reverse foreach { req =>
+ req.handlers.reverse foreach {
+ case x: MemberDefHandler if x.definesValue && !isInternalTermName(x.name) => return Some(x.member)
+ case _ => ()
+ }
+ }
+ None
+ }
+
+ private def updateReplScope(sym: Symbol, isDefined: Boolean) {
+ def log(what: String) {
+ val mark = if (sym.isType) "t " else "v "
+ val name = exitingTyper(sym.nameString)
+ val info = cleanTypeAfterTyper(sym)
+ val defn = sym defStringSeenAs info
+
+ scopelog(f"[$mark$what%6s] $name%-25s $defn%s")
+ }
+ if (ObjectClass isSubClass sym.owner) return
+ // unlink previous
+ replScope lookupAll sym.name foreach { sym =>
+ log("unlink")
+ replScope unlink sym
+ }
+ val what = if (isDefined) "define" else "import"
+ log(what)
+ replScope enter sym
+ }
+
+ def recordRequest(req: Request) {
+ if (req == null)
+ return
+
+ prevRequests += req
+
+ // warning about serially defining companions. It'd be easy
+ // enough to just redefine them together but that may not always
+ // be what people want so I'm waiting until I can do it better.
+ exitingTyper {
+ req.defines filterNot (s => req.defines contains s.companionSymbol) foreach { newSym =>
+ val oldSym = replScope lookup newSym.name.companionName
+ if (Seq(oldSym, newSym).permutations exists { case Seq(s1, s2) => s1.isClass && s2.isModule }) {
+ replwarn(s"warning: previously defined $oldSym is not a companion to $newSym.")
+ replwarn("Companions must be defined together; you may wish to use :paste mode for this.")
+ }
+ }
+ }
+ exitingTyper {
+ req.imports foreach (sym => updateReplScope(sym, isDefined = false))
+ req.defines foreach (sym => updateReplScope(sym, isDefined = true))
+ }
+ }
+
+ private[nsc] def replwarn(msg: => String) {
+ if (!settings.nowarnings)
+ printMessage(msg)
+ }
+
+ def compileSourcesKeepingRun(sources: SourceFile*) = {
+ val run = new Run()
+ assert(run.typerPhase != NoPhase, "REPL requires a typer phase.")
+ reporter.reset()
+ run compileSources sources.toList
+ (!reporter.hasErrors, run)
+ }
+
+ /** Compile an nsc SourceFile. Returns true if there are
+ * no compilation errors, or false otherwise.
+ */
+ def compileSources(sources: SourceFile*): Boolean =
+ compileSourcesKeepingRun(sources: _*)._1
+
+ /** Compile a string. Returns true if there are no
+ * compilation errors, or false otherwise.
+ */
+ def compileString(code: String): Boolean =
+ compileSources(new BatchSourceFile("<script>", code))
+
+ /** Build a request from the user. `trees` is `line` after being parsed.
+ */
+ private def buildRequest(line: String, trees: List[Tree]): Request = {
+ executingRequest = new Request(line, trees)
+ executingRequest
+ }
+
+ private def safePos(t: Tree, alt: Int): Int =
+ try t.pos.start
+ catch { case _: UnsupportedOperationException => alt }
+
+ // Given an expression like 10 * 10 * 10 we receive the parent tree positioned
+ // at a '*'. So look at each subtree and find the earliest of all positions.
+ private def earliestPosition(tree: Tree): Int = {
+ var pos = Int.MaxValue
+ tree foreach { t =>
+ pos = math.min(pos, safePos(t, Int.MaxValue))
+ }
+ pos
+ }
+
+ private def requestFromLine(line: String, synthetic: Boolean): Either[IR.Result, Request] = {
+ val content = indentCode(line)
+ val trees = parse(content) match {
+ case parse.Incomplete => return Left(IR.Incomplete)
+ case parse.Error => return Left(IR.Error)
+ case parse.Success(trees) => trees
+ }
+ repltrace(
+ trees map (t => {
+ // [Eugene to Paul] previously it just said `t map ...`
+ // because there was an implicit conversion from Tree to a list of Trees
+ // however Martin and I have removed the conversion
+ // (it was conflicting with the new reflection API),
+ // so I had to rewrite this a bit
+ val subs = t collect { case sub => sub }
+ subs map (t0 =>
+ " " + safePos(t0, -1) + ": " + t0.shortClass + "\n"
+ ) mkString ""
+ }) mkString "\n"
+ )
+ // If the last tree is a bare expression, pinpoint where it begins using the
+ // AST node position and snap the line off there. Rewrite the code embodied
+ // by the last tree as a ValDef instead, so we can access the value.
+ val last = trees.lastOption.getOrElse(EmptyTree)
+ last match {
+ case _:Assign => // we don't want to include assignments
+ case _:TermTree | _:Ident | _:Select => // ... but do want other unnamed terms.
+ val varName = if (synthetic) freshInternalVarName() else freshUserVarName()
+ val rewrittenLine = (
+ // In theory this would come out the same without the 1-specific test, but
+ // it's a cushion against any more sneaky parse-tree position vs. code mismatches:
+ // this way such issues will only arise on multiple-statement repl input lines,
+ // which most people don't use.
+ if (trees.size == 1) "val " + varName + " =\n" + content
+ else {
+ // The position of the last tree
+ val lastpos0 = earliestPosition(last)
+ // Oh boy, the parser throws away parens so "(2+2)" is mispositioned,
+ // with increasingly hard to decipher positions as we move on to "() => 5",
+ // (x: Int) => x + 1, and more. So I abandon attempts to finesse and just
+ // look for semicolons and newlines, which I'm sure is also buggy.
+ val (raw1, raw2) = content splitAt lastpos0
+ repldbg("[raw] " + raw1 + " <---> " + raw2)
+
+ val adjustment = (raw1.reverse takeWhile (ch => (ch != ';') && (ch != '\n'))).size
+ val lastpos = lastpos0 - adjustment
+
+ // the source code split at the laboriously determined position.
+ val (l1, l2) = content splitAt lastpos
+ repldbg("[adj] " + l1 + " <---> " + l2)
+
+ val prefix = if (l1.trim == "") "" else l1 + ";\n"
+ // Note to self: val source needs to have this precise structure so that
+ // error messages print the user-submitted part without the "val res0 = " part.
+ val combined = prefix + "val " + varName + " =\n" + l2
+
+ repldbg(List(
+ " line" -> line,
+ " content" -> content,
+ " was" -> l2,
+ "combined" -> combined) map {
+ case (label, s) => label + ": '" + s + "'"
+ } mkString "\n"
+ )
+ combined
+ }
+ )
+ // Rewriting "foo ; bar ; 123"
+ // to "foo ; bar ; val resXX = 123"
+ requestFromLine(rewrittenLine, synthetic) match {
+ case Right(req) => return Right(req withOriginalLine line)
+ case x => return x
+ }
+ case _ =>
+ }
+ Right(buildRequest(line, trees))
+ }
+
+ // dealias non-public types so we don't see protected aliases like Self
+ def dealiasNonPublic(tp: Type) = tp match {
+ case TypeRef(_, sym, _) if sym.isAliasType && !sym.isPublic => tp.dealias
+ case _ => tp
+ }
+
+ /**
+ * Interpret one line of input. All feedback, including parse errors
+ * and evaluation results, are printed via the supplied compiler's
+ * reporter. Values defined are available for future interpreted strings.
+ *
+ * The return value is whether the line was interpreter successfully,
+ * e.g. that there were no parse errors.
+ */
+ def interpret(line: String): IR.Result = interpret(line, synthetic = false)
+ def interpretSynthetic(line: String): IR.Result = interpret(line, synthetic = true)
+ def interpret(line: String, synthetic: Boolean): IR.Result = compile(line, synthetic) match {
+ case Left(result) => result
+ case Right(req) => new WrappedRequest(req).loadAndRunReq
+ }
+
+ private def compile(line: String, synthetic: Boolean): Either[IR.Result, Request] = {
+ if (global == null) Left(IR.Error)
+ else requestFromLine(line, synthetic) match {
+ case Left(result) => Left(result)
+ case Right(req) =>
+ // null indicates a disallowed statement type; otherwise compile and
+ // fail if false (implying e.g. a type error)
+ if (req == null || !req.compile) Left(IR.Error) else Right(req)
+ }
+ }
+
+ var code = ""
+ var bound = false
+ def compiled(script: String): CompiledScript = {
+ if (!bound) {
+ quietBind("engine" -> this.asInstanceOf[ScriptEngine])
+ bound = true
+ }
+ val cat = code + script
+ compile(cat, false) match {
+ case Left(result) => result match {
+ case IR.Incomplete => {
+ code = cat + "\n"
+ new CompiledScript {
+ def eval(context: ScriptContext): Object = null
+ def getEngine: ScriptEngine = SparkIMain.this
+ }
+ }
+ case _ => {
+ code = ""
+ throw new ScriptException("compile-time error")
+ }
+ }
+ case Right(req) => {
+ code = ""
+ new WrappedRequest(req)
+ }
+ }
+ }
+
+ private class WrappedRequest(val req: Request) extends CompiledScript {
+ var recorded = false
+
+ /** In Java we would have to wrap any checked exception in the declared
+ * ScriptException. Runtime exceptions and errors would be ok and would
+ * not need to be caught. So let us do the same in Scala : catch and
+ * wrap any checked exception, and let runtime exceptions and errors
+ * escape. We could have wrapped runtime exceptions just like other
+ * exceptions in ScriptException, this is a choice.
+ */
+ @throws[ScriptException]
+ def eval(context: ScriptContext): Object = {
+ val result = req.lineRep.evalEither match {
+ case Left(e: RuntimeException) => throw e
+ case Left(e: Exception) => throw new ScriptException(e)
+ case Left(e) => throw e
+ case Right(result) => result.asInstanceOf[Object]
+ }
+ if (!recorded) {
+ recordRequest(req)
+ recorded = true
+ }
+ result
+ }
+
+ def loadAndRunReq = classLoader.asContext {
+ val (result, succeeded) = req.loadAndRun
+
+ /** To our displeasure, ConsoleReporter offers only printMessage,
+ * which tacks a newline on the end. Since that breaks all the
+ * output checking, we have to take one off to balance.
+ */
+ if (succeeded) {
+ if (printResults && result != "")
+ printMessage(result stripSuffix "\n")
+ else if (isReplDebug) // show quiet-mode activity
+ printMessage(result.trim.lines map ("[quiet] " + _) mkString "\n")
+
+ // Book-keeping. Have to record synthetic requests too,
+ // as they may have been issued for information, e.g. :type
+ recordRequest(req)
+ IR.Success
+ }
+ else {
+ // don't truncate stack traces
+ printUntruncatedMessage(result)
+ IR.Error
+ }
+ }
+
+ def getEngine: ScriptEngine = SparkIMain.this
+ }
+
+ /** Bind a specified name to a specified value. The name may
+ * later be used by expressions passed to interpret.
+ *
+ * @param name the variable name to bind
+ * @param boundType the type of the variable, as a string
+ * @param value the object value to bind to it
+ * @return an indication of whether the binding succeeded
+ */
+ def bind(name: String, boundType: String, value: Any, modifiers: List[String] = Nil): IR.Result = {
+ val bindRep = new ReadEvalPrint()
+ bindRep.compile("""
+ |object %s {
+ | var value: %s = _
+ | def set(x: Any) = value = x.asInstanceOf[%s]
+ |}
+ """.stripMargin.format(bindRep.evalName, boundType, boundType)
+ )
+ bindRep.callEither("set", value) match {
+ case Left(ex) =>
+ repldbg("Set failed in bind(%s, %s, %s)".format(name, boundType, value))
+ repldbg(util.stackTraceString(ex))
+ IR.Error
+
+ case Right(_) =>
+ val line = "%sval %s = %s.value".format(modifiers map (_ + " ") mkString, name, bindRep.evalPath)
+ repldbg("Interpreting: " + line)
+ interpret(line)
+ }
+ }
+ def directBind(name: String, boundType: String, value: Any): IR.Result = {
+ val result = bind(name, boundType, value)
+ if (result == IR.Success)
+ directlyBoundNames += newTermName(name)
+ result
+ }
+ def directBind(p: NamedParam): IR.Result = directBind(p.name, p.tpe, p.value)
+ def directBind[T: ru.TypeTag : ClassTag](name: String, value: T): IR.Result = directBind((name, value))
+
+ def rebind(p: NamedParam): IR.Result = {
+ val name = p.name
+ val newType = p.tpe
+ val tempName = freshInternalVarName()
+
+ quietRun("val %s = %s".format(tempName, name))
+ quietRun("val %s = %s.asInstanceOf[%s]".format(name, tempName, newType))
+ }
+ def quietBind(p: NamedParam): IR.Result = beQuietDuring(bind(p))
+ def bind(p: NamedParam): IR.Result = bind(p.name, p.tpe, p.value)
+ def bind[T: ru.TypeTag : ClassTag](name: String, value: T): IR.Result = bind((name, value))
+
+ /** Reset this interpreter, forgetting all user-specified requests. */
+ def reset() {
+ clearExecutionWrapper()
+ resetClassLoader()
+ resetAllCreators()
+ prevRequests.clear()
+ resetReplScope()
+ replOutput.dir.clear()
+ }
+
+ /** This instance is no longer needed, so release any resources
+ * it is using. The reporter's output gets flushed.
+ */
+ def close() {
+ reporter.flush()
+ }
+
+ /** Here is where we:
+ *
+ * 1) Read some source code, and put it in the "read" object.
+ * 2) Evaluate the read object, and put the result in the "eval" object.
+ * 3) Create a String for human consumption, and put it in the "print" object.
+ *
+ * Read! Eval! Print! Some of that not yet centralized here.
+ */
+ class ReadEvalPrint(val lineId: Int) {
+ def this() = this(freshLineId())
+
+ val packageName = sessionNames.line + lineId
+ val readName = sessionNames.read
+ val evalName = sessionNames.eval
+ val printName = sessionNames.print
+ val resultName = sessionNames.result
+
+ def bindError(t: Throwable) = {
+ if (!bindExceptions) // avoid looping if already binding
+ throw t
+
+ val unwrapped = unwrap(t)
+
+ // Example input: $line3.$read$$iw$$iw$
+ val classNameRegex = (naming.lineRegex + ".*").r
+ def isWrapperInit(x: StackTraceElement) = cond(x.getClassName) {
+ case classNameRegex() if x.getMethodName == nme.CONSTRUCTOR.decoded => true
+ }
+ val stackTrace = unwrapped stackTracePrefixString (!isWrapperInit(_))
+
+ withLastExceptionLock[String]({
+ directBind[Throwable]("lastException", unwrapped)(StdReplTags.tagOfThrowable, classTag[Throwable])
+ stackTrace
+ }, stackTrace)
+ }
+
+ // TODO: split it out into a package object and a regular
+ // object and we can do that much less wrapping.
+ def packageDecl = "package " + packageName
+
+ def pathTo(name: String) = packageName + "." + name
+ def packaged(code: String) = packageDecl + "\n\n" + code
+
+ def readPath = pathTo(readName)
+ def evalPath = pathTo(evalName)
+
+ def call(name: String, args: Any*): AnyRef = {
+ val m = evalMethod(name)
+ repldbg("Invoking: " + m)
+ if (args.nonEmpty)
+ repldbg(" with args: " + args.mkString(", "))
+
+ m.invoke(evalClass, args.map(_.asInstanceOf[AnyRef]): _*)
+ }
+
+ def callEither(name: String, args: Any*): Either[Throwable, AnyRef] =
+ try Right(call(name, args: _*))
+ catch { case ex: Throwable => Left(ex) }
+
+ class EvalException(msg: String, cause: Throwable) extends RuntimeException(msg, cause) { }
+
+ private def evalError(path: String, ex: Throwable) =
+ throw new EvalException("Failed to load '" + path + "': " + ex.getMessage, ex)
+
+ private def load(path: String): Class[_] = {
+ try Class.forName(path, true, classLoader)
+ catch { case ex: Throwable => evalError(path, unwrap(ex)) }
+ }
+
+ lazy val evalClass = load(evalPath)
+
+ def evalEither = callEither(resultName) match {
+ case Left(ex) => ex match {
+ case ex: NullPointerException => Right(null)
+ case ex => Left(unwrap(ex))
+ }
+ case Right(result) => Right(result)
+ }
+
+ def compile(source: String): Boolean = compileAndSaveRun("<console>", source)
+
+ /** The innermost object inside the wrapper, found by
+ * following accessPath into the outer one.
+ */
+ def resolvePathToSymbol(accessPath: String): Symbol = {
+ val readRoot: global.Symbol = readRootPath(readPath) // the outermost wrapper
+ ((".INSTANCE" + accessPath) split '.').foldLeft(readRoot: Symbol) {
+ case (sym, "") => sym
+ case (sym, name) => exitingTyper(termMember(sym, name))
+ }
+ }
+ /** We get a bunch of repeated warnings for reasons I haven't
+ * entirely figured out yet. For now, squash.
+ */
+ private def updateRecentWarnings(run: Run) {
+ def loop(xs: List[(Position, String)]): List[(Position, String)] = xs match {
+ case Nil => Nil
+ case ((pos, msg)) :: rest =>
+ val filtered = rest filter { case (pos0, msg0) =>
+ (msg != msg0) || (pos.lineContent.trim != pos0.lineContent.trim) || {
+ // same messages and same line content after whitespace removal
+ // but we want to let through multiple warnings on the same line
+ // from the same run. The untrimmed line will be the same since
+ // there's no whitespace indenting blowing it.
+ (pos.lineContent == pos0.lineContent)
+ }
+ }
+ ((pos, msg)) :: loop(filtered)
+ }
+ val warnings = loop(run.reporting.allConditionalWarnings)
+ if (warnings.nonEmpty)
+ mostRecentWarnings = warnings
+ }
+ private def evalMethod(name: String) = evalClass.getMethods filter (_.getName == name) match {
+ case Array() => null
+ case Array(method) => method
+ case xs => sys.error("Internal error: eval object " + evalClass + ", " + xs.mkString("\n", "\n", ""))
+ }
+ private def compileAndSaveRun(label: String, code: String) = {
+ showCodeIfDebugging(code)
+ val (success, run) = compileSourcesKeepingRun(new BatchSourceFile(label, packaged(code)))
+ updateRecentWarnings(run)
+ success
+ }
+ }
+
+ /** One line of code submitted by the user for interpretation */
+ class Request(val line: String, val trees: List[Tree]) {
+ def defines = defHandlers flatMap (_.definedSymbols)
+ def imports = importedSymbols
+ def value = Some(handlers.last) filter (h => h.definesValue) map (h => definedSymbols(h.definesTerm.get)) getOrElse NoSymbol
+
+ val lineRep = new ReadEvalPrint()
+
+ private var _originalLine: String = null
+ def withOriginalLine(s: String): this.type = { _originalLine = s ; this }
+ def originalLine = if (_originalLine == null) line else _originalLine
+
+ /** handlers for each tree in this request */
+ val handlers: List[MemberHandler] = trees map (memberHandlers chooseHandler _)
+ def defHandlers = handlers collect { case x: MemberDefHandler => x }
+
+ /** list of names used by this expression */
+ val referencedNames: List[Name] = handlers flatMap (_.referencedNames)
+
+ /** def and val names */
+ def termNames = handlers flatMap (_.definesTerm)
+ def typeNames = handlers flatMap (_.definesType)
+ def importedSymbols = handlers flatMap {
+ case x: ImportHandler => x.importedSymbols
+ case _ => Nil
+ }
+
+ val definedClasses = handlers.exists {
+ case _: ClassHandler => true
+ case _ => false
+ }
+ /** Code to import bound names from previous lines - accessPath is code to
+ * append to objectName to access anything bound by request.
+ */
+ lazy val ComputedImports(importsPreamble, importsTrailer, accessPath) =
+ exitingTyper(importsCode(referencedNames.toSet, ObjectSourceCode, definedClasses))
+
+ /** the line of code to compute */
+ def toCompute = line
+
+ /** The path of the value that contains the user code. */
+ def fullAccessPath = s"${lineRep.readPath}.INSTANCE$accessPath"
+
+ /** The path of the given member of the wrapping instance. */
+ def fullPath(vname: String) = s"$fullAccessPath.`$vname`"
+
+ /** generate the source code for the object that computes this request */
+ abstract class Wrapper extends SparkIMain.CodeAssembler[MemberHandler] {
+ def path = originalPath("$intp")
+ def envLines = {
+ if (!isReplPower) Nil // power mode only for now
+ else List("def %s = %s".format("$line", tquoted(originalLine)), "def %s = Nil".format("$trees"))
+ }
+ def preamble = s"""
+ |$preambleHeader
+ |%s%s%s
+ """.stripMargin.format(lineRep.readName, envLines.map(" " + _ + ";\n").mkString,
+ importsPreamble, indentCode(toCompute))
+
+ val generate = (m: MemberHandler) => m extraCodeToEvaluate Request.this
+
+ /** A format string with %s for $read, specifying the wrapper definition. */
+ def preambleHeader: String
+
+ /** Like preambleHeader for an import wrapper. */
+ def prewrap: String = preambleHeader + "\n"
+
+ /** Like postamble for an import wrapper. */
+ def postwrap: String
+ }
+
+ private class ObjectBasedWrapper extends Wrapper {
+ def preambleHeader = "object %s {"
+
+ def postamble = importsTrailer + "\n}"
+
+ def postwrap = "}\n"
+ }
+
+ private class ClassBasedWrapper extends Wrapper {
+ def preambleHeader = "class %s extends Serializable {"
+
+ /** Adds an object that instantiates the outer wrapping class. */
+ def postamble = s"""
+ |$importsTrailer
+ |}
+ |object ${lineRep.readName} {
+ | val INSTANCE = new ${lineRep.readName}();
+ |}
+ |""".stripMargin
+
+ import nme.{ INTERPRETER_IMPORT_WRAPPER => iw }
+
+ /** Adds a val that instantiates the wrapping class. */
+ def postwrap = s"}\nval $iw = new $iw\n"
+ }
+
+ private lazy val ObjectSourceCode: Wrapper = new ClassBasedWrapper
+ private object ResultObjectSourceCode extends SparkIMain.CodeAssembler[MemberHandler] {
+ /** We only want to generate this code when the result
+ * is a value which can be referred to as-is.
+ */
+ val evalResult = Request.this.value match {
+ case NoSymbol => ""
+ case sym =>
+ "lazy val %s = %s".format(lineRep.resultName, fullPath(sym.decodedName))
+ }
+ // first line evaluates object to make sure constructor is run
+ // initial "" so later code can uniformly be: + etc
+ val preamble = """
+ |object %s {
+ | %s
+ | lazy val %s: String = %s {
+ | %s
+ | (""
+ """.stripMargin.format(
+ lineRep.evalName, evalResult, lineRep.printName,
+ executionWrapper, fullAccessPath
+ )
+
+ val postamble = """
+ | )
+ | }
+ |}
+ """.stripMargin
+ val generate = (m: MemberHandler) => m resultExtractionCode Request.this
+ }
+
+ /** Compile the object file. Returns whether the compilation succeeded.
+ * If all goes well, the "types" map is computed. */
+ lazy val compile: Boolean = {
+ // error counting is wrong, hence interpreter may overlook failure - so we reset
+ reporter.reset()
+
+ // compile the object containing the user's code
+ lineRep.compile(ObjectSourceCode(handlers)) && {
+ // extract and remember types
+ typeOf
+ typesOfDefinedTerms
+
+ // Assign symbols to the original trees
+ // TODO - just use the new trees.
+ defHandlers foreach { dh =>
+ val name = dh.member.name
+ definedSymbols get name foreach { sym =>
+ dh.member setSymbol sym
+ repldbg("Set symbol of " + name + " to " + symbolDefString(sym))
+ }
+ }
+
+ // compile the result-extraction object
+ val handls = if (printResults) handlers else Nil
+ withoutWarnings(lineRep compile ResultObjectSourceCode(handls))
+ }
+ }
+
+ lazy val resultSymbol = lineRep.resolvePathToSymbol(accessPath)
+
+ def applyToResultMember[T](name: Name, f: Symbol => T) = exitingTyper(f(resultSymbol.info.nonPrivateDecl(name)))
+
+ /* typeOf lookup with encoding */
+ def lookupTypeOf(name: Name) = typeOf.getOrElse(name, typeOf(global.encode(name.toString)))
+
+ private def typeMap[T](f: Type => T) =
+ mapFrom[Name, Name, T](termNames ++ typeNames)(x => f(cleanMemberDecl(resultSymbol, x)))
+
+ /** Types of variables defined by this request. */
+ lazy val compilerTypeOf = typeMap[Type](x => x) withDefaultValue NoType
+ /** String representations of same. */
+ lazy val typeOf = typeMap[String](tp => exitingTyper(tp.toString))
+
+ lazy val definedSymbols = (
+ termNames.map(x => x -> applyToResultMember(x, x => x)) ++
+ typeNames.map(x => x -> compilerTypeOf(x).typeSymbolDirect)
+ ).toMap[Name, Symbol] withDefaultValue NoSymbol
+
+ lazy val typesOfDefinedTerms = mapFrom[Name, Name, Type](termNames)(x => applyToResultMember(x, _.tpe))
+
+ /** load and run the code using reflection */
+ def loadAndRun: (String, Boolean) = {
+ try { ("" + (lineRep call sessionNames.print), true) }
+ catch { case ex: Throwable => (lineRep.bindError(ex), false) }
+ }
+
+ override def toString = "Request(line=%s, %s trees)".format(line, trees.size)
+ }
+
+ def createBindings: Bindings = new IBindings {
+ override def put(name: String, value: Object): Object = {
+ val n = name.indexOf(":")
+ val p: NamedParam = if (n < 0) (name, value) else {
+ val nme = name.substring(0, n).trim
+ val tpe = name.substring(n + 1).trim
+ NamedParamClass(nme, tpe, value)
+ }
+ if (!p.name.startsWith("javax.script")) bind(p)
+ null
+ }
+ }
+
+ @throws[ScriptException]
+ def compile(script: String): CompiledScript = eval("new javax.script.CompiledScript { def eval(context: javax.script.ScriptContext): Object = { " + script + " }.asInstanceOf[Object]; def getEngine: javax.script.ScriptEngine = engine }").asInstanceOf[CompiledScript]
+
+ @throws[ScriptException]
+ def compile(reader: java.io.Reader): CompiledScript = compile(stringFromReader(reader))
+
+ @throws[ScriptException]
+ def eval(script: String, context: ScriptContext): Object = compiled(script).eval(context)
+
+ @throws[ScriptException]
+ def eval(reader: java.io.Reader, context: ScriptContext): Object = eval(stringFromReader(reader), context)
+
+ override def finalize = close
+
+ /** Returns the name of the most recent interpreter result.
+ * Mostly this exists so you can conveniently invoke methods on
+ * the previous result.
+ */
+ def mostRecentVar: String =
+ if (mostRecentlyHandledTree.isEmpty) ""
+ else "" + (mostRecentlyHandledTree.get match {
+ case x: ValOrDefDef => x.name
+ case Assign(Ident(name), _) => name
+ case ModuleDef(_, name, _) => name
+ case _ => naming.mostRecentVar
+ })
+
+ private var mostRecentWarnings: List[(global.Position, String)] = Nil
+ def lastWarnings = mostRecentWarnings
+
+ private lazy val importToGlobal = global mkImporter ru
+ private lazy val importToRuntime = ru.internal createImporter global
+ private lazy val javaMirror = ru.rootMirror match {
+ case x: ru.JavaMirror => x
+ case _ => null
+ }
+ private implicit def importFromRu(sym: ru.Symbol): Symbol = importToGlobal importSymbol sym
+ private implicit def importToRu(sym: Symbol): ru.Symbol = importToRuntime importSymbol sym
+
+ def classOfTerm(id: String): Option[JClass] = symbolOfTerm(id) match {
+ case NoSymbol => None
+ case sym => Some(javaMirror runtimeClass importToRu(sym).asClass)
+ }
+
+ def typeOfTerm(id: String): Type = symbolOfTerm(id).tpe
+
+ def valueOfTerm(id: String): Option[Any] = exitingTyper {
+ def value() = {
+ val sym0 = symbolOfTerm(id)
+ val sym = (importToRuntime importSymbol sym0).asTerm
+ val module = runtimeMirror.reflectModule(sym.owner.companionSymbol.asModule).instance
+ val module1 = runtimeMirror.reflect(module)
+ val invoker = module1.reflectField(sym)
+
+ invoker.get
+ }
+
+ try Some(value()) catch { case _: Exception => None }
+ }
+
+ /** It's a bit of a shotgun approach, but for now we will gain in
+ * robustness. Try a symbol-producing operation at phase typer, and
+ * if that is NoSymbol, try again at phase flatten. I'll be able to
+ * lose this and run only from exitingTyper as soon as I figure out
+ * exactly where a flat name is sneaking in when calculating imports.
+ */
+ def tryTwice(op: => Symbol): Symbol = exitingTyper(op) orElse exitingFlatten(op)
+
+ def symbolOfIdent(id: String): Symbol = symbolOfType(id) orElse symbolOfTerm(id)
+ def symbolOfType(id: String): Symbol = tryTwice(replScope lookup (id: TypeName))
+ def symbolOfTerm(id: String): Symbol = tryTwice(replScope lookup (id: TermName))
+ def symbolOfName(id: Name): Symbol = replScope lookup id
+
+ def runtimeClassAndTypeOfTerm(id: String): Option[(JClass, Type)] = {
+ classOfTerm(id) flatMap { clazz =>
+ clazz.supers find (!_.isScalaAnonymous) map { nonAnon =>
+ (nonAnon, runtimeTypeOfTerm(id))
+ }
+ }
+ }
+
+ def runtimeTypeOfTerm(id: String): Type = {
+ typeOfTerm(id) andAlso { tpe =>
+ val clazz = classOfTerm(id) getOrElse { return NoType }
+ val staticSym = tpe.typeSymbol
+ val runtimeSym = getClassIfDefined(clazz.getName)
+
+ if ((runtimeSym != NoSymbol) && (runtimeSym != staticSym) && (runtimeSym isSubClass staticSym))
+ runtimeSym.info
+ else NoType
+ }
+ }
+
+ def cleanTypeAfterTyper(sym: => Symbol): Type = {
+ exitingTyper(
+ dealiasNonPublic(
+ dropNullaryMethod(
+ sym.tpe_*
+ )
+ )
+ )
+ }
+ def cleanMemberDecl(owner: Symbol, member: Name): Type =
+ cleanTypeAfterTyper(owner.info nonPrivateDecl member)
+
+ object exprTyper extends {
+ val repl: SparkIMain.this.type = imain
+ } with SparkExprTyper { }
+
+ /** Parse a line into and return parsing result (error, incomplete or success with list of trees) */
+ object parse {
+ abstract sealed class Result
+ case object Error extends Result
+ case object Incomplete extends Result
+ case class Success(trees: List[Tree]) extends Result
+
+ def apply(line: String): Result = debugging(s"""parse("$line")""") {
+ var isIncomplete = false
+ currentRun.reporting.withIncompleteHandler((_, _) => isIncomplete = true) {
+ reporter.reset()
+ val trees = newUnitParser(line).parseStats()
+ if (reporter.hasErrors) Error
+ else if (isIncomplete) Incomplete
+ else Success(trees)
+ }
+ }
+ }
+
+ def symbolOfLine(code: String): Symbol =
+ exprTyper.symbolOfLine(code)
+
+ def typeOfExpression(expr: String, silent: Boolean = true): Type =
+ exprTyper.typeOfExpression(expr, silent)
+
+ protected def onlyTerms(xs: List[Name]): List[TermName] = xs collect { case x: TermName => x }
+ protected def onlyTypes(xs: List[Name]): List[TypeName] = xs collect { case x: TypeName => x }
+
+ def definedTerms = onlyTerms(allDefinedNames) filterNot isInternalTermName
+ def definedTypes = onlyTypes(allDefinedNames)
+ def definedSymbolList = prevRequestList flatMap (_.defines) filterNot (s => isInternalTermName(s.name))
+
+ // Terms with user-given names (i.e. not res0 and not synthetic)
+ def namedDefinedTerms = definedTerms filterNot (x => isUserVarName("" + x) || directlyBoundNames(x))
+
+ private var _replScope: Scope = _
+ private def resetReplScope() {
+ _replScope = newScope
+ }
+ def replScope = {
+ if (_replScope eq null)
+ _replScope = newScope
+
+ _replScope
+ }
+
+ private var executingRequest: Request = _
+ private val prevRequests = mutable.ListBuffer[Request]()
+ private val directlyBoundNames = mutable.Set[Name]()
+
+ def allHandlers = prevRequestList flatMap (_.handlers)
+ def lastRequest = if (prevRequests.isEmpty) null else prevRequests.last
+ def prevRequestList = prevRequests.toList
+ def importHandlers = allHandlers collect { case x: ImportHandler => x }
+
+ def withoutUnwrapping(op: => Unit): Unit = {
+ val saved = isettings.unwrapStrings
+ isettings.unwrapStrings = false
+ try op
+ finally isettings.unwrapStrings = saved
+ }
+
+ def symbolDefString(sym: Symbol) = {
+ TypeStrings.quieter(
+ exitingTyper(sym.defString),
+ sym.owner.name + ".this.",
+ sym.owner.fullName + "."
+ )
+ }
+
+ def showCodeIfDebugging(code: String) {
+ /** Secret bookcase entrance for repl debuggers: end the line
+ * with "// show" and see what's going on.
+ */
+ def isShow = code.lines exists (_.trim endsWith "// show")
+ if (isReplDebug || isShow) {
+ beSilentDuring(parse(code)) match {
+ case parse.Success(ts) =>
+ ts foreach { t =>
+ withoutUnwrapping(echo(asCompactString(t)))
+ }
+ case _ =>
+ }
+ }
+ }
+
+ // debugging
+ def debugging[T](msg: String)(res: T) = {
+ repldbg(msg + " " + res)
+ res
+ }
+}
+
+/** Utility methods for the Interpreter. */
+object SparkIMain {
+ import java.util.Arrays.{ asList => asJavaList }
+
+ // The two name forms this is catching are the two sides of this assignment:
+ //
+ // $line3.$read.$iw.$iw.Bippy =
+ // $line3.$read$$iw$$iw$Bippy@4a6a00ca
+ private def removeLineWrapper(s: String) = s.replaceAll("""\$line\d+[./]\$(read|eval|print)[$.]""", "")
+ private def removeIWPackages(s: String) = s.replaceAll("""\$(iw|read|eval|print)[$.]""", "")
+ private def removeSparkVals(s: String) = s.replaceAll("""\$VAL[0-9]+[$.]""", "")
+ def stripString(s: String) = removeSparkVals(removeIWPackages(removeLineWrapper(s)))
+
+ trait CodeAssembler[T] {
+ def preamble: String
+ def generate: T => String
+ def postamble: String
+
+ def apply(contributors: List[T]): String = stringFromWriter { code =>
+ code println preamble
+ contributors map generate foreach (code println _)
+ code println postamble
+ }
+ }
+
+ trait StrippingWriter {
+ def isStripping: Boolean
+ def stripImpl(str: String): String
+ def strip(str: String): String = if (isStripping) stripImpl(str) else str
+ }
+ trait TruncatingWriter {
+ def maxStringLength: Int
+ def isTruncating: Boolean
+ def truncate(str: String): String = {
+ if (isTruncating && (maxStringLength != 0 && str.length > maxStringLength))
+ (str take maxStringLength - 3) + "..."
+ else str
+ }
+ }
+ abstract class StrippingTruncatingWriter(out: JPrintWriter)
+ extends JPrintWriter(out)
+ with StrippingWriter
+ with TruncatingWriter {
+ self =>
+
+ def clean(str: String): String = truncate(strip(str))
+ override def write(str: String) = super.write(clean(str))
+ }
+ class SparkReplStrippingWriter(intp: SparkIMain) extends StrippingTruncatingWriter(intp.out) {
+ import intp._
+ def maxStringLength = isettings.maxPrintString
+ def isStripping = isettings.unwrapStrings
+ def isTruncating = reporter.truncationOK
+
+ def stripImpl(str: String): String = naming.unmangle(str)
+ }
+}
+
+/** Settings for the interpreter
+ *
+ * @version 1.0
+ * @author Lex Spoon, 2007/3/24
+ **/
+class SparkISettings(intp: SparkIMain) {
+ /** The maximum length of toString to use when printing the result
+ * of an evaluation. 0 means no maximum. If a printout requires
+ * more than this number of characters, then the printout is
+ * truncated.
+ */
+ var maxPrintString = replProps.maxPrintString.option.getOrElse(800)
+
+ /** The maximum number of completion candidates to print for tab
+ * completion without requiring confirmation.
+ */
+ var maxAutoprintCompletion = 250
+
+ /** String unwrapping can be disabled if it is causing issues.
+ * Setting this to false means you will see Strings like "$iw.$iw.".
+ */
+ var unwrapStrings = true
+
+ def deprecation_=(x: Boolean) = {
+ val old = intp.settings.deprecation.value
+ intp.settings.deprecation.value = x
+ if (!old && x) println("Enabled -deprecation output.")
+ else if (old && !x) println("Disabled -deprecation output.")
+ }
+ def deprecation: Boolean = intp.settings.deprecation.value
+
+ def allSettings = Map[String, Any](
+ "maxPrintString" -> maxPrintString,
+ "maxAutoprintCompletion" -> maxAutoprintCompletion,
+ "unwrapStrings" -> unwrapStrings,
+ "deprecation" -> deprecation
+ )
+
+ private def allSettingsString =
+ allSettings.toList sortBy (_._1) map { case (k, v) => " " + k + " = " + v + "\n" } mkString
+
+ override def toString = """
+ | SparkISettings {
+ | %s
+ | }""".stripMargin.format(allSettingsString)
+}
http://git-wip-us.apache.org/repos/asf/spark/blob/4af9de7d/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkImports.scala
----------------------------------------------------------------------
diff --git a/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkImports.scala b/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkImports.scala
new file mode 100644
index 0000000..e60406d
--- /dev/null
+++ b/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkImports.scala
@@ -0,0 +1,201 @@
+/* NSC -- new Scala compiler
+ * Copyright 2005-2013 LAMP/EPFL
+ * @author Paul Phillips
+ */
+
+package scala.tools.nsc
+package interpreter
+
+import scala.collection.{ mutable, immutable }
+
+trait SparkImports {
+ self: SparkIMain =>
+
+ import global._
+ import definitions.{ ObjectClass, ScalaPackage, JavaLangPackage, PredefModule }
+ import memberHandlers._
+
+ /** Synthetic import handlers for the language defined imports. */
+ private def makeWildcardImportHandler(sym: Symbol): ImportHandler = {
+ val hd :: tl = sym.fullName.split('.').toList map newTermName
+ val tree = Import(
+ tl.foldLeft(Ident(hd): Tree)((x, y) => Select(x, y)),
+ ImportSelector.wildList
+ )
+ tree setSymbol sym
+ new ImportHandler(tree)
+ }
+
+ /** Symbols whose contents are language-defined to be imported. */
+ def languageWildcardSyms: List[Symbol] = List(JavaLangPackage, ScalaPackage, PredefModule)
+ def languageWildcardHandlers = languageWildcardSyms map makeWildcardImportHandler
+
+ def allImportedNames = importHandlers flatMap (_.importedNames)
+
+ /** Types which have been wildcard imported, such as:
+ * val x = "abc" ; import x._ // type java.lang.String
+ * import java.lang.String._ // object java.lang.String
+ *
+ * Used by tab completion.
+ *
+ * XXX right now this gets import x._ and import java.lang.String._,
+ * but doesn't figure out import String._. There's a lot of ad hoc
+ * scope twiddling which should be swept away in favor of digging
+ * into the compiler scopes.
+ */
+ def sessionWildcards: List[Type] = {
+ importHandlers filter (_.importsWildcard) map (_.targetType) distinct
+ }
+
+ def languageSymbols = languageWildcardSyms flatMap membersAtPickler
+ def sessionImportedSymbols = importHandlers flatMap (_.importedSymbols)
+ def importedSymbols = languageSymbols ++ sessionImportedSymbols
+ def importedTermSymbols = importedSymbols collect { case x: TermSymbol => x }
+
+ /** Tuples of (source, imported symbols) in the order they were imported.
+ */
+ def importedSymbolsBySource: List[(Symbol, List[Symbol])] = {
+ val lang = languageWildcardSyms map (sym => (sym, membersAtPickler(sym)))
+ val session = importHandlers filter (_.targetType != NoType) map { mh =>
+ (mh.targetType.typeSymbol, mh.importedSymbols)
+ }
+
+ lang ++ session
+ }
+ def implicitSymbolsBySource: List[(Symbol, List[Symbol])] = {
+ importedSymbolsBySource map {
+ case (k, vs) => (k, vs filter (_.isImplicit))
+ } filterNot (_._2.isEmpty)
+ }
+
+ /** Compute imports that allow definitions from previous
+ * requests to be visible in a new request. Returns
+ * three pieces of related code:
+ *
+ * 1. An initial code fragment that should go before
+ * the code of the new request.
+ *
+ * 2. A code fragment that should go after the code
+ * of the new request.
+ *
+ * 3. An access path which can be traversed to access
+ * any bindings inside code wrapped by #1 and #2 .
+ *
+ * The argument is a set of Names that need to be imported.
+ *
+ * Limitations: This method is not as precise as it could be.
+ * (1) It does not process wildcard imports to see what exactly
+ * they import.
+ * (2) If it imports any names from a request, it imports all
+ * of them, which is not really necessary.
+ * (3) It imports multiple same-named implicits, but only the
+ * last one imported is actually usable.
+ */
+ case class ComputedImports(prepend: String, append: String, access: String)
+ protected def importsCode(wanted: Set[Name], wrapper: Request#Wrapper, definedClass: Boolean): ComputedImports = {
+ /** Narrow down the list of requests from which imports
+ * should be taken. Removes requests which cannot contribute
+ * useful imports for the specified set of wanted names.
+ */
+ case class ReqAndHandler(req: Request, handler: MemberHandler) { }
+
+ def reqsToUse: List[ReqAndHandler] = {
+ /** Loop through a list of MemberHandlers and select which ones to keep.
+ * 'wanted' is the set of names that need to be imported.
+ */
+ def select(reqs: List[ReqAndHandler], wanted: Set[Name]): List[ReqAndHandler] = {
+ // Single symbol imports might be implicits! See bug #1752. Rather than
+ // try to finesse this, we will mimic all imports for now.
+ def keepHandler(handler: MemberHandler) = handler match {
+ case h: ImportHandler if definedClass => h.importedNames.exists(x => wanted.contains(x))
+ case _: ImportHandler => true
+ case x => x.definesImplicit || (x.definedNames exists wanted)
+ }
+
+ reqs match {
+ case Nil => Nil
+ case rh :: rest if !keepHandler(rh.handler) => select(rest, wanted)
+ case rh :: rest =>
+ import rh.handler._
+ val newWanted = wanted ++ referencedNames -- definedNames -- importedNames
+ rh :: select(rest, newWanted)
+ }
+ }
+
+ /** Flatten the handlers out and pair each with the original request */
+ select(allReqAndHandlers reverseMap { case (r, h) => ReqAndHandler(r, h) }, wanted).reverse
+ }
+
+ val code, trailingBraces, accessPath = new StringBuilder
+ val currentImps = mutable.HashSet[Name]()
+
+ // add code for a new object to hold some imports
+ def addWrapper() {
+ import nme.{ INTERPRETER_IMPORT_WRAPPER => iw }
+ code append (wrapper.prewrap format iw)
+ trailingBraces append wrapper.postwrap
+ accessPath append s".$iw"
+ currentImps.clear()
+ }
+
+ def maybeWrap(names: Name*) = if (names exists currentImps) addWrapper()
+
+ def wrapBeforeAndAfter[T](op: => T): T = {
+ addWrapper()
+ try op finally addWrapper()
+ }
+
+ // loop through previous requests, adding imports for each one
+ wrapBeforeAndAfter {
+ for (ReqAndHandler(req, handler) <- reqsToUse) {
+ handler match {
+ // If the user entered an import, then just use it; add an import wrapping
+ // level if the import might conflict with some other import
+ case x: ImportHandler if x.importsWildcard =>
+ wrapBeforeAndAfter(code append (x.member + "\n"))
+ case x: ImportHandler =>
+ maybeWrap(x.importedNames: _*)
+ code append (x.member + "\n")
+ currentImps ++= x.importedNames
+
+ case x: ClassHandler =>
+ for (imv <- x.definedNames) {
+ val objName = req.lineRep.readPath
+ code.append("import " + objName + ".INSTANCE" + req.accessPath + ".`" + imv + "`\n")
+ }
+
+ // For other requests, import each defined name.
+ // import them explicitly instead of with _, so that
+ // ambiguity errors will not be generated. Also, quote
+ // the name of the variable, so that we don't need to
+ // handle quoting keywords separately.
+ case x =>
+ for (imv <- x.definedNames) {
+ if (currentImps contains imv) addWrapper()
+ val objName = req.lineRep.readPath
+ val valName = "$VAL" + newValId()
+ if(!code.toString.endsWith(".`" + imv + "`;\n")) { // Which means already imported
+ code.append("val " + valName + " = " + objName + ".INSTANCE\n")
+ code.append("import " + valName + req.accessPath + ".`" + imv + "`;\n")
+ }
+ currentImps += imv
+ }
+ }
+ }
+ }
+ addWrapper()
+ ComputedImports(code.toString, trailingBraces.toString, accessPath.toString)
+ }
+ private var curValId = 0
+
+ private def newValId(): Int = {
+ curValId += 1
+ curValId
+ }
+
+ private def allReqAndHandlers =
+ prevRequestList flatMap (req => req.handlers map (req -> _))
+
+ private def membersAtPickler(sym: Symbol): List[Symbol] =
+ enteringPickler(sym.info.nonPrivateMembers.toList)
+}
http://git-wip-us.apache.org/repos/asf/spark/blob/4af9de7d/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkJLineCompletion.scala
----------------------------------------------------------------------
diff --git a/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkJLineCompletion.scala b/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkJLineCompletion.scala
new file mode 100644
index 0000000..7fe6dcb
--- /dev/null
+++ b/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkJLineCompletion.scala
@@ -0,0 +1,350 @@
+/* NSC -- new Scala compiler
+ * Copyright 2005-2013 LAMP/EPFL
+ * @author Paul Phillips
+ */
+
+package scala.tools.nsc
+package interpreter
+
+import Completion._
+import scala.collection.mutable.ListBuffer
+import scala.reflect.internal.util.StringOps.longestCommonPrefix
+
+// REPL completor - queries supplied interpreter for valid
+// completions based on current contents of buffer.
+class SparkJLineCompletion(val intp: SparkIMain) extends Completion with CompletionOutput {
+ val global: intp.global.type = intp.global
+ import global._
+ import definitions._
+ import rootMirror.{ RootClass, getModuleIfDefined }
+ import intp.{ debugging }
+
+ // verbosity goes up with consecutive tabs
+ private var verbosity: Int = 0
+ def resetVerbosity() = verbosity = 0
+
+ def getSymbol(name: String, isModule: Boolean) = (
+ if (isModule) getModuleIfDefined(name)
+ else getModuleIfDefined(name)
+ )
+
+ trait CompilerCompletion {
+ def tp: Type
+ def effectiveTp = tp match {
+ case MethodType(Nil, resType) => resType
+ case NullaryMethodType(resType) => resType
+ case _ => tp
+ }
+
+ // for some reason any's members don't show up in subclasses, which
+ // we need so 5.<tab> offers asInstanceOf etc.
+ private def anyMembers = AnyTpe.nonPrivateMembers
+ def anyRefMethodsToShow = Set("isInstanceOf", "asInstanceOf", "toString")
+
+ def tos(sym: Symbol): String = sym.decodedName
+ def memberNamed(s: String) = exitingTyper(effectiveTp member newTermName(s))
+
+ // XXX we'd like to say "filterNot (_.isDeprecated)" but this causes the
+ // compiler to crash for reasons not yet known.
+ def members = exitingTyper((effectiveTp.nonPrivateMembers.toList ++ anyMembers) filter (_.isPublic))
+ def methods = members.toList filter (_.isMethod)
+ def packages = members.toList filter (_.hasPackageFlag)
+ def aliases = members.toList filter (_.isAliasType)
+
+ def memberNames = members map tos
+ def methodNames = methods map tos
+ def packageNames = packages map tos
+ def aliasNames = aliases map tos
+ }
+
+ object NoTypeCompletion extends TypeMemberCompletion(NoType) {
+ override def memberNamed(s: String) = NoSymbol
+ override def members = Nil
+ override def follow(s: String) = None
+ override def alternativesFor(id: String) = Nil
+ }
+
+ object TypeMemberCompletion {
+ def apply(tp: Type, runtimeType: Type, param: NamedParam): TypeMemberCompletion = {
+ new TypeMemberCompletion(tp) {
+ var upgraded = false
+ lazy val upgrade = {
+ intp rebind param
+ intp.reporter.printMessage("\nRebinding stable value %s from %s to %s".format(param.name, tp, param.tpe))
+ upgraded = true
+ new TypeMemberCompletion(runtimeType)
+ }
+ override def completions(verbosity: Int) = {
+ super.completions(verbosity) ++ (
+ if (verbosity == 0) Nil
+ else upgrade.completions(verbosity)
+ )
+ }
+ override def follow(s: String) = super.follow(s) orElse {
+ if (upgraded) upgrade.follow(s)
+ else None
+ }
+ override def alternativesFor(id: String) = super.alternativesFor(id) ++ (
+ if (upgraded) upgrade.alternativesFor(id)
+ else Nil
+ ) distinct
+ }
+ }
+ def apply(tp: Type): TypeMemberCompletion = {
+ if (tp eq NoType) NoTypeCompletion
+ else if (tp.typeSymbol.isPackageClass) new PackageCompletion(tp)
+ else new TypeMemberCompletion(tp)
+ }
+ def imported(tp: Type) = new ImportCompletion(tp)
+ }
+
+ class TypeMemberCompletion(val tp: Type) extends CompletionAware
+ with CompilerCompletion {
+ def excludeEndsWith: List[String] = Nil
+ def excludeStartsWith: List[String] = List("<") // <byname>, <repeated>, etc.
+ def excludeNames: List[String] = (anyref.methodNames filterNot anyRefMethodsToShow) :+ "_root_"
+
+ def methodSignatureString(sym: Symbol) = {
+ IMain stripString exitingTyper(new MethodSymbolOutput(sym).methodString())
+ }
+
+ def exclude(name: String): Boolean = (
+ (name contains "$") ||
+ (excludeNames contains name) ||
+ (excludeEndsWith exists (name endsWith _)) ||
+ (excludeStartsWith exists (name startsWith _))
+ )
+ def filtered(xs: List[String]) = xs filterNot exclude distinct
+
+ def completions(verbosity: Int) =
+ debugging(tp + " completions ==> ")(filtered(memberNames))
+
+ override def follow(s: String): Option[CompletionAware] =
+ debugging(tp + " -> '" + s + "' ==> ")(Some(TypeMemberCompletion(memberNamed(s).tpe)) filterNot (_ eq NoTypeCompletion))
+
+ override def alternativesFor(id: String): List[String] =
+ debugging(id + " alternatives ==> ") {
+ val alts = members filter (x => x.isMethod && tos(x) == id) map methodSignatureString
+
+ if (alts.nonEmpty) "" :: alts else Nil
+ }
+
+ override def toString = "%s (%d members)".format(tp, members.size)
+ }
+
+ class PackageCompletion(tp: Type) extends TypeMemberCompletion(tp) {
+ override def excludeNames = anyref.methodNames
+ }
+
+ class LiteralCompletion(lit: Literal) extends TypeMemberCompletion(lit.value.tpe) {
+ override def completions(verbosity: Int) = verbosity match {
+ case 0 => filtered(memberNames)
+ case _ => memberNames
+ }
+ }
+
+ class ImportCompletion(tp: Type) extends TypeMemberCompletion(tp) {
+ override def completions(verbosity: Int) = verbosity match {
+ case 0 => filtered(members filterNot (_.isSetter) map tos)
+ case _ => super.completions(verbosity)
+ }
+ }
+
+ // not for completion but for excluding
+ object anyref extends TypeMemberCompletion(AnyRefTpe) { }
+
+ // the unqualified vals/defs/etc visible in the repl
+ object ids extends CompletionAware {
+ override def completions(verbosity: Int) = intp.unqualifiedIds ++ List("classOf") //, "_root_")
+ // now we use the compiler for everything.
+ override def follow(id: String): Option[CompletionAware] = {
+ if (!completions(0).contains(id))
+ return None
+
+ val tpe = intp typeOfExpression id
+ if (tpe == NoType)
+ return None
+
+ def default = Some(TypeMemberCompletion(tpe))
+
+ // only rebinding vals in power mode for now.
+ if (!isReplPower) default
+ else intp runtimeClassAndTypeOfTerm id match {
+ case Some((clazz, runtimeType)) =>
+ val sym = intp.symbolOfTerm(id)
+ if (sym.isStable) {
+ val param = new NamedParam.Untyped(id, intp valueOfTerm id getOrElse null)
+ Some(TypeMemberCompletion(tpe, runtimeType, param))
+ }
+ else default
+ case _ =>
+ default
+ }
+ }
+ override def toString = "<repl ids> (%s)".format(completions(0).size)
+ }
+
+ // user-issued wildcard imports like "import global._" or "import String._"
+ private def imported = intp.sessionWildcards map TypeMemberCompletion.imported
+
+ // literal Ints, Strings, etc.
+ object literals extends CompletionAware {
+ def simpleParse(code: String): Option[Tree] = newUnitParser(code).parseStats().lastOption
+ def completions(verbosity: Int) = Nil
+
+ override def follow(id: String) = simpleParse(id).flatMap {
+ case x: Literal => Some(new LiteralCompletion(x))
+ case _ => None
+ }
+ }
+
+ // top level packages
+ object rootClass extends TypeMemberCompletion(RootClass.tpe) {
+ override def completions(verbosity: Int) = super.completions(verbosity) :+ "_root_"
+ override def follow(id: String) = id match {
+ case "_root_" => Some(this)
+ case _ => super.follow(id)
+ }
+ }
+ // members of Predef
+ object predef extends TypeMemberCompletion(PredefModule.tpe) {
+ override def excludeEndsWith = super.excludeEndsWith ++ List("Wrapper", "ArrayOps")
+ override def excludeStartsWith = super.excludeStartsWith ++ List("wrap")
+ override def excludeNames = anyref.methodNames
+
+ override def exclude(name: String) = super.exclude(name) || (
+ (name contains "2")
+ )
+
+ override def completions(verbosity: Int) = verbosity match {
+ case 0 => Nil
+ case _ => super.completions(verbosity)
+ }
+ }
+ // members of scala.*
+ object scalalang extends PackageCompletion(ScalaPackage.tpe) {
+ def arityClasses = List("Product", "Tuple", "Function")
+ def skipArity(name: String) = arityClasses exists (x => name != x && (name startsWith x))
+ override def exclude(name: String) = super.exclude(name) || (
+ skipArity(name)
+ )
+
+ override def completions(verbosity: Int) = verbosity match {
+ case 0 => filtered(packageNames ++ aliasNames)
+ case _ => super.completions(verbosity)
+ }
+ }
+ // members of java.lang.*
+ object javalang extends PackageCompletion(JavaLangPackage.tpe) {
+ override lazy val excludeEndsWith = super.excludeEndsWith ++ List("Exception", "Error")
+ override lazy val excludeStartsWith = super.excludeStartsWith ++ List("CharacterData")
+
+ override def completions(verbosity: Int) = verbosity match {
+ case 0 => filtered(packageNames)
+ case _ => super.completions(verbosity)
+ }
+ }
+
+ // the list of completion aware objects which should be consulted
+ // for top level unqualified, it's too noisy to let much in.
+ lazy val topLevelBase: List[CompletionAware] = List(ids, rootClass, predef, scalalang, javalang, literals)
+ def topLevel = topLevelBase ++ imported
+ def topLevelThreshold = 50
+
+ // the first tier of top level objects (doesn't include file completion)
+ def topLevelFor(parsed: Parsed): List[String] = {
+ val buf = new ListBuffer[String]
+ topLevel foreach { ca =>
+ buf ++= (ca completionsFor parsed)
+
+ if (buf.size > topLevelThreshold)
+ return buf.toList.sorted
+ }
+ buf.toList
+ }
+
+ // the most recent result
+ def lastResult = Forwarder(() => ids follow intp.mostRecentVar)
+
+ def lastResultFor(parsed: Parsed) = {
+ /** The logic is a little tortured right now because normally '.' is
+ * ignored as a delimiter, but on .<tab> it needs to be propagated.
+ */
+ val xs = lastResult completionsFor parsed
+ if (parsed.isEmpty) xs map ("." + _) else xs
+ }
+
+ def completer(): ScalaCompleter = new JLineTabCompletion
+
+ /** This gets a little bit hairy. It's no small feat delegating everything
+ * and also keeping track of exactly where the cursor is and where it's supposed
+ * to end up. The alternatives mechanism is a little hacky: if there is an empty
+ * string in the list of completions, that means we are expanding a unique
+ * completion, so don't update the "last" buffer because it'll be wrong.
+ */
+ class JLineTabCompletion extends ScalaCompleter {
+ // For recording the buffer on the last tab hit
+ private var lastBuf: String = ""
+ private var lastCursor: Int = -1
+
+ // Does this represent two consecutive tabs?
+ def isConsecutiveTabs(buf: String, cursor: Int) =
+ cursor == lastCursor && buf == lastBuf
+
+ // This is jline's entry point for completion.
+ override def complete(buf: String, cursor: Int): Candidates = {
+ verbosity = if (isConsecutiveTabs(buf, cursor)) verbosity + 1 else 0
+ repldbg(f"%ncomplete($buf, $cursor%d) last = ($lastBuf, $lastCursor%d), verbosity: $verbosity")
+
+ // we don't try lower priority completions unless higher ones return no results.
+ def tryCompletion(p: Parsed, completionFunction: Parsed => List[String]): Option[Candidates] = {
+ val winners = completionFunction(p)
+ if (winners.isEmpty)
+ return None
+ val newCursor =
+ if (winners contains "") p.cursor
+ else {
+ val advance = longestCommonPrefix(winners)
+ lastCursor = p.position + advance.length
+ lastBuf = (buf take p.position) + advance
+ repldbg(s"tryCompletion($p, _) lastBuf = $lastBuf, lastCursor = $lastCursor, p.position = ${p.position}")
+ p.position
+ }
+
+ Some(Candidates(newCursor, winners))
+ }
+
+ def mkDotted = Parsed.dotted(buf, cursor) withVerbosity verbosity
+
+ // a single dot is special cased to completion on the previous result
+ def lastResultCompletion =
+ if (!looksLikeInvocation(buf)) None
+ else tryCompletion(Parsed.dotted(buf drop 1, cursor), lastResultFor)
+
+ def tryAll = (
+ lastResultCompletion
+ orElse tryCompletion(mkDotted, topLevelFor)
+ getOrElse Candidates(cursor, Nil)
+ )
+
+ /**
+ * This is the kickoff point for all manner of theoretically
+ * possible compiler unhappiness. The fault may be here or
+ * elsewhere, but we don't want to crash the repl regardless.
+ * The compiler makes it impossible to avoid catching Throwable
+ * with its unfortunate tendency to throw java.lang.Errors and
+ * AssertionErrors as the hats drop. We take two swings at it
+ * because there are some spots which like to throw an assertion
+ * once, then work after that. Yeah, what can I say.
+ */
+ try tryAll
+ catch { case ex: Throwable =>
+ repldbg("Error: complete(%s, %s) provoked".format(buf, cursor) + ex)
+ Candidates(cursor,
+ if (isReplDebug) List("<error:" + ex + ">")
+ else Nil
+ )
+ }
+ }
+ }
+}
http://git-wip-us.apache.org/repos/asf/spark/blob/4af9de7d/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkMemberHandlers.scala
----------------------------------------------------------------------
diff --git a/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkMemberHandlers.scala b/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkMemberHandlers.scala
new file mode 100644
index 0000000..0e22bc8
--- /dev/null
+++ b/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkMemberHandlers.scala
@@ -0,0 +1,221 @@
+/* NSC -- new Scala compiler
+ * Copyright 2005-2013 LAMP/EPFL
+ * @author Martin Odersky
+ */
+
+package scala.tools.nsc
+package interpreter
+
+import scala.collection.{ mutable, immutable }
+import scala.language.implicitConversions
+
+trait SparkMemberHandlers {
+ val intp: SparkIMain
+
+ import intp.{ Request, global, naming }
+ import global._
+ import naming._
+
+ private def codegenln(leadingPlus: Boolean, xs: String*): String = codegen(leadingPlus, (xs ++ Array("\n")): _*)
+ private def codegenln(xs: String*): String = codegenln(true, xs: _*)
+ private def codegen(leadingPlus: Boolean, xs: String*): String = {
+ val front = if (leadingPlus) "+ " else ""
+ front + (xs map string2codeQuoted mkString " + ")
+ }
+ private implicit def name2string(name: Name) = name.toString
+
+ /** A traverser that finds all mentioned identifiers, i.e. things
+ * that need to be imported. It might return extra names.
+ */
+ private class ImportVarsTraverser extends Traverser {
+ val importVars = new mutable.HashSet[Name]()
+
+ override def traverse(ast: Tree) = ast match {
+ case Ident(name) =>
+ // XXX this is obviously inadequate but it's going to require some effort
+ // to get right.
+ if (name.toString startsWith "x$") ()
+ else importVars += name
+ case _ => super.traverse(ast)
+ }
+ }
+ private object ImportVarsTraverser {
+ def apply(member: Tree) = {
+ val ivt = new ImportVarsTraverser()
+ ivt traverse member
+ ivt.importVars.toList
+ }
+ }
+
+ private def isTermMacro(ddef: DefDef): Boolean = ddef.mods.isMacro
+
+ def chooseHandler(member: Tree): MemberHandler = member match {
+ case member: DefDef if isTermMacro(member) => new TermMacroHandler(member)
+ case member: DefDef => new DefHandler(member)
+ case member: ValDef => new ValHandler(member)
+ case member: ModuleDef => new ModuleHandler(member)
+ case member: ClassDef => new ClassHandler(member)
+ case member: TypeDef => new TypeAliasHandler(member)
+ case member: Assign => new AssignHandler(member)
+ case member: Import => new ImportHandler(member)
+ case DocDef(_, documented) => chooseHandler(documented)
+ case member => new GenericHandler(member)
+ }
+
+ sealed abstract class MemberDefHandler(override val member: MemberDef) extends MemberHandler(member) {
+ override def name: Name = member.name
+ def mods: Modifiers = member.mods
+ def keyword = member.keyword
+ def prettyName = name.decode
+
+ override def definesImplicit = member.mods.isImplicit
+ override def definesTerm: Option[TermName] = Some(name.toTermName) filter (_ => name.isTermName)
+ override def definesType: Option[TypeName] = Some(name.toTypeName) filter (_ => name.isTypeName)
+ override def definedSymbols = if (symbol.exists) symbol :: Nil else Nil
+ }
+
+ /** Class to handle one member among all the members included
+ * in a single interpreter request.
+ */
+ sealed abstract class MemberHandler(val member: Tree) {
+ def name: Name = nme.NO_NAME
+ def path = intp.originalPath(symbol).replaceFirst("read", "read.INSTANCE")
+ def symbol = if (member.symbol eq null) NoSymbol else member.symbol
+ def definesImplicit = false
+ def definesValue = false
+
+ def definesTerm = Option.empty[TermName]
+ def definesType = Option.empty[TypeName]
+
+ private lazy val _referencedNames = ImportVarsTraverser(member)
+ def referencedNames = _referencedNames
+ def importedNames = List[Name]()
+ def definedNames = definesTerm.toList ++ definesType.toList
+ def definedSymbols = List[Symbol]()
+
+ def extraCodeToEvaluate(req: Request): String = ""
+ def resultExtractionCode(req: Request): String = ""
+
+ private def shortName = this.getClass.toString split '.' last
+ override def toString = shortName + referencedNames.mkString(" (refs: ", ", ", ")")
+ }
+
+ class GenericHandler(member: Tree) extends MemberHandler(member)
+
+ class ValHandler(member: ValDef) extends MemberDefHandler(member) {
+ val maxStringElements = 1000 // no need to mkString billions of elements
+ override def definesValue = true
+
+ override def resultExtractionCode(req: Request): String = {
+
+ val isInternal = isUserVarName(name) && req.lookupTypeOf(name) == "Unit"
+ if (!mods.isPublic || isInternal) ""
+ else {
+ // if this is a lazy val we avoid evaluating it here
+ val resultString =
+ if (mods.isLazy) codegenln(false, "<lazy>")
+ else any2stringOf(path, maxStringElements)
+
+ val vidString =
+ if (replProps.vids) s"""" + " @ " + "%%8x".format(System.identityHashCode($path)) + " """.trim
+ else ""
+
+ """ + "%s%s: %s = " + %s""".format(string2code(prettyName), vidString, string2code(req typeOf name), resultString)
+ }
+ }
+ }
+
+ class DefHandler(member: DefDef) extends MemberDefHandler(member) {
+ override def definesValue = flattensToEmpty(member.vparamss) // true if 0-arity
+ override def resultExtractionCode(req: Request) =
+ if (mods.isPublic) codegenln(name, ": ", req.typeOf(name)) else ""
+ }
+
+ abstract class MacroHandler(member: DefDef) extends MemberDefHandler(member) {
+ override def referencedNames = super.referencedNames.flatMap(name => List(name.toTermName, name.toTypeName))
+ override def definesValue = false
+ override def definesTerm: Option[TermName] = Some(name.toTermName)
+ override def definesType: Option[TypeName] = None
+ override def resultExtractionCode(req: Request) = if (mods.isPublic) codegenln(notification(req)) else ""
+ def notification(req: Request): String
+ }
+
+ class TermMacroHandler(member: DefDef) extends MacroHandler(member) {
+ def notification(req: Request) = s"defined term macro $name: ${req.typeOf(name)}"
+ }
+
+ class AssignHandler(member: Assign) extends MemberHandler(member) {
+ val Assign(lhs, rhs) = member
+ override lazy val name = newTermName(freshInternalVarName())
+
+ override def definesTerm = Some(name)
+ override def definesValue = true
+ override def extraCodeToEvaluate(req: Request) =
+ """val %s = %s""".format(name, lhs)
+
+ /** Print out lhs instead of the generated varName */
+ override def resultExtractionCode(req: Request) = {
+ val lhsType = string2code(req lookupTypeOf name)
+ val res = string2code(req fullPath name)
+ """ + "%s: %s = " + %s + "\n" """.format(string2code(lhs.toString), lhsType, res) + "\n"
+ }
+ }
+
+ class ModuleHandler(module: ModuleDef) extends MemberDefHandler(module) {
+ override def definesTerm = Some(name.toTermName)
+ override def definesValue = true
+
+ override def resultExtractionCode(req: Request) = codegenln("defined object ", name)
+ }
+
+ class ClassHandler(member: ClassDef) extends MemberDefHandler(member) {
+ override def definedSymbols = List(symbol, symbol.companionSymbol) filterNot (_ == NoSymbol)
+ override def definesType = Some(name.toTypeName)
+ override def definesTerm = Some(name.toTermName) filter (_ => mods.isCase)
+
+ override def resultExtractionCode(req: Request) =
+ codegenln("defined %s %s".format(keyword, name))
+ }
+
+ class TypeAliasHandler(member: TypeDef) extends MemberDefHandler(member) {
+ private def isAlias = mods.isPublic && treeInfo.isAliasTypeDef(member)
+ override def definesType = Some(name.toTypeName) filter (_ => isAlias)
+
+ override def resultExtractionCode(req: Request) =
+ codegenln("defined type alias ", name) + "\n"
+ }
+
+ class ImportHandler(imp: Import) extends MemberHandler(imp) {
+ val Import(expr, selectors) = imp
+ def targetType = intp.global.rootMirror.getModuleIfDefined("" + expr) match {
+ case NoSymbol => intp.typeOfExpression("" + expr)
+ case sym => sym.thisType
+ }
+ private def importableTargetMembers = importableMembers(targetType).toList
+ // wildcard imports, e.g. import foo._
+ private def selectorWild = selectors filter (_.name == nme.USCOREkw)
+ // renamed imports, e.g. import foo.{ bar => baz }
+ private def selectorRenames = selectors map (_.rename) filterNot (_ == null)
+
+ /** Whether this import includes a wildcard import */
+ val importsWildcard = selectorWild.nonEmpty
+
+ def implicitSymbols = importedSymbols filter (_.isImplicit)
+ def importedSymbols = individualSymbols ++ wildcardSymbols
+
+ private val selectorNames = selectorRenames filterNot (_ == nme.USCOREkw) flatMap (_.bothNames) toSet
+ lazy val individualSymbols: List[Symbol] = exitingTyper(importableTargetMembers filter (m => selectorNames(m.name)))
+ lazy val wildcardSymbols: List[Symbol] = exitingTyper(if (importsWildcard) importableTargetMembers else Nil)
+
+ /** Complete list of names imported by a wildcard */
+ lazy val wildcardNames: List[Name] = wildcardSymbols map (_.name)
+ lazy val individualNames: List[Name] = individualSymbols map (_.name)
+
+ /** The names imported by this statement */
+ override lazy val importedNames: List[Name] = wildcardNames ++ individualNames
+ lazy val importsSymbolNamed: Set[String] = importedNames map (_.toString) toSet
+
+ def importString = imp.toString
+ override def resultExtractionCode(req: Request) = codegenln(importString) + "\n"
+ }
+}
http://git-wip-us.apache.org/repos/asf/spark/blob/4af9de7d/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkReplReporter.scala
----------------------------------------------------------------------
diff --git a/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkReplReporter.scala b/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkReplReporter.scala
new file mode 100644
index 0000000..0711ed4
--- /dev/null
+++ b/repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkReplReporter.scala
@@ -0,0 +1,53 @@
+/* NSC -- new Scala compiler
+ * Copyright 2002-2013 LAMP/EPFL
+ * @author Paul Phillips
+ */
+
+package scala.tools.nsc
+package interpreter
+
+import reporters._
+import SparkIMain._
+
+import scala.reflect.internal.util.Position
+
+/** Like ReplGlobal, a layer for ensuring extra functionality.
+ */
+class SparkReplReporter(intp: SparkIMain) extends ConsoleReporter(intp.settings, Console.in, new SparkReplStrippingWriter(intp)) {
+ def printUntruncatedMessage(msg: String) = withoutTruncating(printMessage(msg))
+
+ /** Whether very long lines can be truncated. This exists so important
+ * debugging information (like printing the classpath) is not rendered
+ * invisible due to the max message length.
+ */
+ private var _truncationOK: Boolean = !intp.settings.verbose
+ def truncationOK = _truncationOK
+ def withoutTruncating[T](body: => T): T = {
+ val saved = _truncationOK
+ _truncationOK = false
+ try body
+ finally _truncationOK = saved
+ }
+
+ override def warning(pos: Position, msg: String): Unit = withoutTruncating(super.warning(pos, msg))
+ override def error(pos: Position, msg: String): Unit = withoutTruncating(super.error(pos, msg))
+
+ override def printMessage(msg: String) {
+ // Avoiding deadlock if the compiler starts logging before
+ // the lazy val is complete.
+ if (intp.isInitializeComplete) {
+ if (intp.totalSilence) {
+ if (isReplTrace)
+ super.printMessage("[silent] " + msg)
+ }
+ else super.printMessage(msg)
+ }
+ else Console.println("[init] " + msg)
+ }
+
+ override def displayPrompt() {
+ if (intp.totalSilence) ()
+ else super.displayPrompt()
+ }
+
+}
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