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sbt compiler bridge for Scala 2

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/*
 * Zinc - The incremental compiler for Scala.
 * Copyright Scala Center, Lightbend dba Akka, and Mark Harrah
 *
 * Scala (https://www.scala-lang.org)
 * Copyright EPFL and Lightbend, Inc. dba Akka
 *
 * 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.
 */

package scala.tools
package xsbt

import scala.reflect.io.NoAbstractFile
import scala.tools.nsc.io.AbstractFile

import java.io.File

/**
 * Contains utility methods for looking up class files corresponding to Symbols.
 */
abstract class LocateClassFile extends Compat with ClassName {
  val global: CallbackGlobal
  import global._

  private[this] final val classSeparator = '.'
  protected def classFile(sym: Symbol): Option[(AbstractFile, String)] =
    // package can never have a corresponding class file; this test does not
    // catch package objects (that do not have this flag set)
    if (sym hasFlag scala.tools.nsc.symtab.Flags.PACKAGE) None
    else {
      val file = sym.associatedFile

      if (file == NoAbstractFile) {
        if (isTopLevelModule(sym)) {
          val linked = sym.companionClass
          if (linked == NoSymbol)
            None
          else
            classFile(linked)
        } else
          None
      } else {
        Some((file, flatname(sym, classSeparator) + sym.moduleSuffix))
      }
    }

  protected def fileForClass(outputDirectory: File, s: Symbol, separatorRequired: Boolean): File =
    new File(outputDirectory, flatclassName(s, File.separatorChar, separatorRequired) + ".class")

  protected def pathToClassFile(s: Symbol, separatorRequired: Boolean): String =
    flatclassName(s, File.separatorChar, separatorRequired) + ".class"
}