/* NSC -- new Scala compiler
 * Copyright 2005-2010 LAMP/EPFL
 * @author  Martin Odersky
 */

package scala.tools.nsc
package typechecker

import util.Statistics._

/** The main attribution phase.
 */ 
trait Analyzer extends AnyRef
            with Contexts
            with Namers
            with Typers
            with Infer
            with Implicits
            with Variances
            with EtaExpansion
            with SyntheticMethods 
            with Unapplies
            with NamesDefaults
            with TypeDiagnostics
{
  val global : Global
  import global._

  object namerFactory extends SubComponent {
    val global: Analyzer.this.global.type = Analyzer.this.global
    val phaseName = "namer"
    val runsAfter = List[String]("parser")
    val runsRightAfter = None
    def newPhase(_prev: Phase): StdPhase = new StdPhase(_prev) {
      override val checkable = false
      override def keepsTypeParams = false

      def apply(unit: CompilationUnit) {
        newNamer(rootContext(unit)).enterSym(unit.body)
      }
    }
  }

  object packageObjects extends SubComponent {
    val global: Analyzer.this.global.type = Analyzer.this.global
    val phaseName = "packageobjects"
    val runsAfter = List[String]()
    val runsRightAfter= Some("namer")

    def newPhase(_prev: Phase): StdPhase = new StdPhase(_prev) {
      import global._

      val openPackageObjectsTraverser = new Traverser {
        override def traverse(tree: Tree): Unit = tree match {
          case ModuleDef(_, _, _) =>
            if (tree.symbol.name == nme.PACKAGEkw) {
              loaders.openPackageModule(tree.symbol)()
            }
          case ClassDef(_, _, _, _) => () // make it fast
          case _ => super.traverse(tree)
        }
      }

      def apply(unit: CompilationUnit) {
        openPackageObjectsTraverser(unit.body)
      }
    }
  }

  object typerFactory extends SubComponent {
    val global: Analyzer.this.global.type = Analyzer.this.global
    val phaseName = "typer"
    val runsAfter = List[String]()
    val runsRightAfter = Some("packageobjects")
    def newPhase(_prev: Phase): StdPhase = new StdPhase(_prev) {
      override def keepsTypeParams = false
      resetTyper() // this does not in fact to the reset for each compilation run!
      override def run { 
        val start = startTimer(typerNanos)
        currentRun.units foreach applyPhase
        stopTimer(typerNanos, start)
      }
      def apply(unit: CompilationUnit) {
        try {
          unit.body = newTyper(rootContext(unit)).typed(unit.body)
          if (global.settings.Yrangepos.value && !global.reporter.hasErrors) global.validatePositions(unit.body)
          for (workItem <- unit.toCheck) workItem()
        } finally {
          unit.toCheck.clear()
        }
      }
    }
  }
}

