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/* __ *\
** ________ ___ / / ___ __ ____ Scala.js sbt plugin **
** / __/ __// _ | / / / _ | __ / // __/ (c) 2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ |/_// /_\ \ http://scala-js.org/ **
** /____/\___/_/ |_/____/_/ | |__/ /____/ **
** |/____/ **
\* */
package scala.scalajs.sbtplugin.env.rhino
import scala.collection.mutable
import org.mozilla.javascript.{Context, Scriptable}
import scala.scalajs.ir
import scala.scalajs.tools.sem.Semantics
import scala.scalajs.tools.javascript.{Printers, ScalaJSClassEmitter}
import scala.scalajs.tools.io._
import scala.scalajs.tools.classpath._
import scala.scalajs.tools.corelib._
class ScalaJSCoreLib(semantics: Semantics, classpath: IRClasspath) {
import ScalaJSCoreLib._
private val (providers, exportedSymbols) = {
val providers = mutable.Map.empty[String, VirtualScalaJSIRFile]
val exportedSymbols = mutable.ListBuffer.empty[String]
for (irFile <- classpath.scalaJSIR) {
val info = irFile.roughInfo
providers += info.encodedName -> irFile
if (info.isExported)
exportedSymbols += info.encodedName
}
(providers, exportedSymbols)
}
def insertInto(context: Context, scope: Scriptable) = {
CoreJSLibs.libs(semantics).foreach(context.evaluateFile(scope, _))
lazifyScalaJSFields(scope)
// Make sure exported symbols are loaded
val ScalaJS = Context.toObject(scope.get("ScalaJS", scope), scope)
val c = Context.toObject(ScalaJS.get("c", ScalaJS), scope)
for (encodedName <- exportedSymbols)
c.get(encodedName, c)
}
/** Source maps the given stack trace (where possible) */
def mapStackTrace(stackTrace: Scriptable,
context: Context, scope: Scriptable): Scriptable = {
val count = Context.toNumber(stackTrace.get("length", stackTrace)).toInt
// Maps file -> max line (0-based)
val neededMaps = mutable.Map.empty[String, Int]
// Collect required line counts
for (i <- 0 until count) {
val elem = Context.toObject(stackTrace.get(i, stackTrace), scope)
val fileName = Context.toString(elem.get("fileName", elem))
if (fileName.endsWith(PseudoFileSuffix) &&
providers.contains(fileName.stripSuffix(PseudoFileSuffix))) {
val curMaxLine = neededMaps.getOrElse(fileName, -1)
val reqLine = Context.toNumber(elem.get("lineNumber", elem)).toInt - 1
if (reqLine > curMaxLine)
neededMaps.put(fileName, reqLine)
}
}
// Map required files
val maps =
for ((fileName, maxLine) <- neededMaps)
yield (fileName, getSourceMapper(fileName, maxLine))
// Create new stack trace to return
val res = context.newArray(scope, count)
for (i <- 0 until count) {
val elem = Context.toObject(stackTrace.get(i, stackTrace), scope)
val fileName = Context.toString(elem.get("fileName", elem))
val line = Context.toNumber(elem.get("lineNumber", elem)).toInt - 1
val pos = maps.get(fileName).fold(ir.Position.NoPosition)(_(line))
val newElem =
if (pos.isDefined) newPosElem(scope, context, elem, pos)
else elem
res.put(i, res, newElem)
}
res
}
private def getSourceMapper(fileName: String, untilLine: Int) = {
val irFile = providers(fileName.stripSuffix(PseudoFileSuffix))
val mapper = new Printers.ReverseSourceMapPrinter(untilLine)
val classDef = irFile.tree
val desugared = new ScalaJSClassEmitter(semantics).genClassDef(classDef)
mapper.reverseSourceMap(desugared)
mapper
}
private def newPosElem(scope: Scriptable, context: Context,
origElem: Scriptable, pos: ir.Position): Scriptable = {
assert(pos.isDefined)
val elem = context.newObject(scope)
elem.put("declaringClass", elem, origElem.get("declaringClass", origElem))
elem.put("methodName", elem, origElem.get("methodName", origElem))
elem.put("fileName", elem, pos.source.toString)
elem.put("lineNumber", elem, pos.line + 1)
elem.put("columnNumber", elem, pos.column + 1)
elem
}
private val scalaJSLazyFields = Seq(
Info("d"),
Info("c"),
Info("h"),
Info("i", isTraitImpl = true),
Info("n", isModule = true),
Info("m", isModule = true),
Info("is"),
Info("as"),
Info("isArrayOf"),
Info("asArrayOf"))
private def lazifyScalaJSFields(scope: Scriptable) = {
val ScalaJS = Context.toObject(scope.get("ScalaJS", scope), scope)
def makeLazyScalaJSScope(base: Scriptable, isModule: Boolean, isTraitImpl: Boolean) =
new LazyScalaJSScope(this, scope, base, isModule, isTraitImpl)
for (Info(name, isModule, isTraitImpl) <- scalaJSLazyFields) {
val base = ScalaJS.get(name, ScalaJS).asInstanceOf[Scriptable]
val lazified = makeLazyScalaJSScope(base, isModule, isTraitImpl)
ScalaJS.put(name, ScalaJS, lazified)
}
}
private[rhino] def load(scope: Scriptable, encodedName: String): Unit = {
providers.get(encodedName) foreach { irFile =>
val codeWriter = new java.io.StringWriter
val printer = new Printers.JSTreePrinter(codeWriter)
val classDef = irFile.tree
val desugared = new ScalaJSClassEmitter(semantics).genClassDef(classDef)
printer.printTopLevelTree(desugared)
printer.complete()
val ctx = Context.getCurrentContext()
val fakeFileName = encodedName + PseudoFileSuffix
ctx.evaluateString(scope, codeWriter.toString(),
fakeFileName, 1, null)
}
}
}
object ScalaJSCoreLib {
private case class Info(name: String,
isModule: Boolean = false, isTraitImpl: Boolean = false)
private val EncodedNameLine = raw""""encodedName": *"([^"]+)"""".r.unanchored
private final val PseudoFileSuffix = ".sjsir"
}
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