home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Scala example source code file (Models.scala)

This example Scala source code file (Models.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

boolean, boolean, composite, composite, constructor, hastree, list, string, tree, tree, val, value, value, var

The Scala Models.scala source code

/* NSC -- new Scala compiler
 * Copyright 2005-2011 LAMP/EPFL
 * @author  Martin Odersky
 */

package scala.tools.nsc
package models

import scala.tools.nsc.Global

/** This abstract class ...
 *
 *  @author  Sean McDirmid
 *  @version 1.0
 */
abstract class Models {
  val global: Global
  import global._

  def acceptPrivate = true

  object Kinds extends Enumeration  {
    type Kind = Value
    val CONSTRUCTOR = Value("Constructor")
    val OBJECT      = Value("Object")
    val CLASS       = Value("Class")
    val TRAIT       = Value("Trait")
    val DEF         = Value("Def")
    val VAL         = Value("Val")
    val VAR         = Value("Var")
    val ARG         = Value("Arg")
    val TPARAM      = Value("Type")
  }
  import Kinds._

  def KINDS = List(CLASS, TRAIT, OBJECT, CONSTRUCTOR, TPARAM, VAL, VAR, DEF)

  def labelFor(kind: Kind): String = kind.toString

  def stringsFor(mods: Modifiers) = {
    var modString: List[String] = Nil
    if (mods.isPrivate  ) modString = "private"   :: modString
    if (mods.isProtected) modString = "protected" :: modString
    if (mods.isOverride ) modString = "override"  :: modString
    if (mods.isAbstract ) modString = "abstract"  :: modString
    if (mods.isDeferred ) modString = "abstract"  :: modString
    if (mods.isCase     ) modString = "case"      :: modString
    if (mods.isSealed   ) modString = "sealed"    :: modString
    if (mods.isFinal    ) modString = "final"     :: modString
    if (mods.isImplicit ) modString = "implicit"  :: modString
    modString
  }

  def codeFor(kind: Kind): String = kind match {
    case CONSTRUCTOR => codeFor(DEF)
    case _ => labelFor(kind).toLowerCase()
  }

  def pluralFor(kind: Kind): String = kind match {
    case CLASS  => "Classes"
    case _ => labelFor(kind) + "s"
  }

  def kindOf(tree: Tree) = {
    val term0 = tree.symbol;
    if (term0 != NoSymbol) {
      if (term0.isVariable) VAR
      else if (term0.isValueParameter) ARG
      else if (term0.isMethod) {
        if (term0.nameString.equals("this")) CONSTRUCTOR
        else DEF
      }
      else if (term0.isClass) {
        if (tree.asInstanceOf[MemberDef].mods.isTrait) TRAIT
        else CLASS
      }
      else if (term0.isModule) OBJECT
      else if (term0.isValue) VAL
      else if (term0.isTypeParameter) TPARAM
      else if (term0.isType) TPARAM
      else {
        // Console.err.println("UNRECOGNIZED SYMBOL: " + term0 + " " + name);
        null
      }
    } else {
      val ddef = tree.asInstanceOf[ValOrDefDef];
      if (ddef.mods.isMutable) VAR;
      else VAL;
    }
  }

  abstract class Model

  // def textFor(tp : AbsTypeDef) : String = tp.toString()

  /**
   *  @param tree ...
   *  @return     ...
   */
  def textFor(tree: Tree): String = {
    var ret = ""
    if (tree.symbol != NoSymbol) tree.symbol.name.toString()
    if (ret.equals("<init>")) ret = "this"
    tree match {
      case cdef: ClassDef =>
        ret = ret + "[" +
          (for (tparam <- cdef.tparams) yield textFor(tparam)) + "]";
        cdef.mods
      case vdef: ValOrDefDef =>
        vdef match {
          case ddef: DefDef =>
          ret = ret + "[" +
            (for (tparam <- ddef.tparams) yield textFor(tparam)) + "]";
          for (vparams <- ddef.vparamss) {
            ret = ret + "(" +
              (for (vparam <- vparams) yield textFor(vparam)) + ")";
          }
          case _ =>
        }
        ret = ret + " : " + textFor(vdef.tpt)
/* Martin to Sean: Please check whether this can be dropped or does it need to be adapted? 
      case atd: AbsTypeDef =>
        ret = ret + "[" + (for (tparam <- atd.tparams) yield textFor(tparam)) + "]" +
                     ((if(atd.hi ne null) " <: " + textFor(atd.hi) else "") +
                     (if(atd.lo ne null) " >: " + textFor(atd.lo) else ""));
*/
      case _ =>
        ret = ret + tree.toString()
    }
    ret
  }

  def mods1(tree: Tree) = tree match {
    case mdef: MemberDef => mdef.mods
    case _ => NoMods
  }

  abstract class HasTree(val parent: Composite) extends Model with Ordered[HasTree] {
    var tree : Tree = _
    def update(tree0: Tree): Boolean = {
      tree = tree0
      false
    }
    def replacedBy(tree0: Tree): Boolean = true
    def text: String = textFor(tree)
    var mods0 = NoMods

    def mods = if (mods0 != NoMods) mods0 else mods1(tree)

    override def toString(): String = tree.toString()

    def compare(that: HasTree): Int = {
      val idx = KINDS.indexOf(kind)
      val jdx = KINDS.indexOf(that.kind)
      if (idx != jdx) return idx - jdx
      val result = tree.symbol.nameString.compare(that.tree.symbol.nameString)
      if (result != 0) result
      else toString().compare(that.toString())
    }
    def compare [b >: HasTree <% Ordered[b]](that: b): Int = {
      if (that.isInstanceOf[HasTree])
        compare(that.asInstanceOf[HasTree])
      else -1
    }

    def kind = kindOf(tree)

    //override def    add(from: Composite, model: HasTree): Unit = { parent.add(from, model) }
    //override def remove(from: Composite, model: HasTree): Unit = { parent.remove(from, model) }
  }

  class ImportMod(parent0: Composite) extends HasTree(parent0) {
    def treex = tree.asInstanceOf[Import]

    override def replacedBy(tree0: Tree): Boolean =
      if (super.replacedBy(tree0) && tree0.isInstanceOf[Import]) {
        val tree1 = tree0.asInstanceOf[Import]
        tree1.tpe == treex.tpe
      } else
        false
  }

  class PackageMod(parent0: Composite) extends HasTree(parent0) {
    def treex = tree.asInstanceOf[PackageDef]
  }

  trait Composite extends Model {
    import scala.collection.mutable._

    class Members extends HashSet[HasTree]
    // val members = new Members
    object members extends Members

    def isMember(tree: Tree): Boolean = tree.isInstanceOf[Import] // imports welcome anywhere.

    def member(tree: Tree, members: List[Tree]): Tree = tree

    def update0(members1: List[Tree]): Boolean = {
      // Console.err.println("update0 " + this + " " + members1)
      // Martin: This is rather ugly code. We should use pattern matching here!
      if (members1.length == 1 && members1.head.isInstanceOf[PackageDef])
        return update0(members1.head.asInstanceOf[PackageDef].stats)
      val marked = new HashSet[HasTree]
      var updated = false
      for (mmbr1 <- members1) if (mmbr1.isInstanceOf[PackageDef]) {
        Console.err.println("PACKAGE: " + mmbr1.symbol + " " + members1.length)
      } else if (isMember(mmbr1)) {
        val mmbr2 = member(mmbr1, members1)
        if (mmbr2 ne null) {
          var found = false
          for (mmbr <- members) if (!found && mmbr.replacedBy(mmbr2)) {
            //Console.err.println("REPLACE: " + mmbr + " with " + mmbr2)
            mmbr.mods0 = mods1(mmbr1)
            found = true
            updated = mmbr.update(mmbr2) || updated
            marked += mmbr
          }
          if (!found) {
            updated = true
            val add = modelFor(mmbr2, this)
            add.update(mmbr2)
            add.mods0 = mods1(mmbr1) & 
              ~symtab.Flags.ACCESSOR & ~symtab.Flags.SYNTHETIC
            val sz = members.size
            members += (add)
            assert(members.size == sz + 1)
            marked += add
          }
        }
        // Console.err.println("update1 " + this + " " + members + " " + marked)
      }
      val sz = members.size
      members.intersect(marked)
      updated = updated || sz < members.size
      // check if anything was removed!
      updated
    }
  }
  abstract class MemberMod(parent0: Composite) extends HasTree(parent0) {
    def treex = tree.asInstanceOf[MemberDef]

    def name: Name = treex.name

    override def replacedBy(tree0: Tree): Boolean =
      if (super.replacedBy(tree0) && tree0.isInstanceOf[MemberDef]) {
        val tree1 = tree0.asInstanceOf[MemberDef]
        treex.toString().equals(tree1.toString())
      } else false

    override def update(tree0: Tree): Boolean = {
      val updated = (tree eq null) || (treex.mods != tree0.asInstanceOf[MemberDef].mods)
      super.update(tree0) || updated;
    }
  }

  abstract class MemberComposite(parent0: Composite) extends MemberMod(parent0) with Composite

  trait HasClassObjects extends Composite {
    override def isMember(tree: Tree): Boolean =
      super.isMember(tree) || tree.isInstanceOf[ImplDef]
  }

  abstract class ValOrDefMod(parent0: Composite) extends MemberComposite(parent0) with HasClassObjects {
    override def replacedBy(tree0: Tree): Boolean =
      super.replacedBy(tree0) && tree0.isInstanceOf[ValOrDefDef]

    override def update(tree0: Tree): Boolean = {
      val tree1 = tree0.asInstanceOf[ValOrDefDef]
      val updated = (tree eq null) || treex.tpe != tree1.tpe
      update0(flatten(tree1.rhs, (tree2: Tree) => isMember(tree2)))
      super.update(tree0) || updated
    }
  }

  class ValMod(parent0: Composite) extends ValOrDefMod(parent0) {
    def treez = tree.asInstanceOf[ValDef]
    override def replacedBy(tree0: Tree): Boolean =
      super.replacedBy(tree0) && tree0.isInstanceOf[ValDef]
  }

  class DefMod(parent0: Composite) extends ValOrDefMod(parent0) {
    def treez = tree.asInstanceOf[DefDef]

    override def replacedBy(tree0: Tree) : Boolean =
      if (super.replacedBy(tree0) && tree0.isInstanceOf[DefDef]) {
        val tree1 = tree0.asInstanceOf[DefDef]
        if (tree1.vparamss.length == treez.vparamss.length) {
          val tpz = for (vd <- treez.vparamss) yield for (xd <- vd) yield xd.tpe;
          val tp1 = for (vd <- tree1.vparamss) yield for (xd <- vd) yield xd.tpe;
          tpz == tp1
        } else false
      } else false
  }

  abstract class ImplMod(parent0: Composite)
  extends MemberComposite(parent0) with HasClassObjects {
    override def replacedBy(tree0: Tree): Boolean =
      super.replacedBy(tree0) && tree0.isInstanceOf[ImplDef]
    override def isMember(tree: Tree): Boolean = (super.isMember(tree) ||
      (tree.isInstanceOf[ValOrDefDef] &&
        (acceptPrivate || !tree.asInstanceOf[ValOrDefDef].mods.isPrivate)
       /* && !tree.asInstanceOf[ValOrDefDef].mods.isPrivate */
       /* && !tree.asInstanceOf[ValOrDefDef].mods.isAccessor */) ||
      treeInfo.isAliasTypeDef(tree))

    override def member(tree: Tree, members: List[Tree]): Tree = {
      val tree0 = if (tree.isInstanceOf[DefDef]) {
        val ddef = tree.asInstanceOf[DefDef]
        ddef.mods
        if (ddef.mods.isAccessor && (ddef.symbol ne null)) {
          val sym0 = ddef.symbol;
          if (sym0.isSetter) return null;
          assert(sym0.isGetter);
          val sym = sym0.accessed
          val ret = if (sym == NoSymbol) {
            val sym = analyzer.underlying(sym0)
            //val name = nme.getterToSetter(sym0.name)
            //val setter = sym0.owner.info.decl(name);
            val isVar = sym.isVariable;
            val mods = (ddef.mods | 
              (if (isVar) symtab.Flags.MUTABLE else 0) | symtab.Flags.DEFERRED) &
                ~symtab.Flags.ACCESSOR & ~symtab.Flags.SYNTHETIC
            val tree = 
              ValDef(mods, ddef.name, ddef.tpt, ddef.rhs).setPos(ddef.pos).setSymbol(sym);
            tree :: Nil;
          } else for (member <- members if member.symbol == sym) yield member
          if (ret.isEmpty) null
          else ret.head
        } else tree
      } else super.member(tree, members)

      def sym = tree0.symbol
      if ((tree0 eq null) || tree0.pos == NoPosition) null
      else if (!acceptPrivate &&
               tree0.isInstanceOf[ValOrDefDef] &&
               tree.asInstanceOf[ValOrDefDef].mods.isPrivate) null
      else tree0
    }

    def children(tree0: Tree): List[Tree] =
      tree0.asInstanceOf[ImplDef].impl.body

    override def update(tree0: Tree): Boolean = {
      var updated = update0(children(tree0))
      super.update(tree0) || updated
    }
  }

  class ClassMod(parent0: Composite) extends ImplMod(parent0) {
    def treez = tree.asInstanceOf[ClassDef]
    override def replacedBy(tree0: Tree): Boolean =
      super.replacedBy(tree0) && tree0.isInstanceOf[ClassDef]
  }

  class ObjectMod(parent0: Composite) extends ImplMod(parent0) {
    def treez = tree.asInstanceOf[ModuleDef]
    override def replacedBy(tree0: Tree): Boolean =
      super.replacedBy(tree0) && tree0.isInstanceOf[ModuleDef]
  }
  class TypeMod(parent0: Composite) extends MemberMod(parent0) {
    override def replacedBy(tree0 : Tree) : Boolean = (super.replacedBy(tree0) && tree0.isInstanceOf[TypeDef]);
  }
  def SourceMod(original: CompilationUnit) = new SourceMod(original)

  class SourceMod(val original: CompilationUnit) extends Composite with HasClassObjects {
    update(original)
    //var listener : Listener = null;
    def update(unit: CompilationUnit) = unit.body match {
      case pdef: PackageDef => try {
        update0(pdef.stats)
      } catch {
        case e: Error => members.clear; update0(pdef.stats)
      }
      case _ =>
    }

    override def isMember(tree: Tree): Boolean =
      super.isMember(tree) || tree.isInstanceOf[Import]
  }

  def flatten0(exprs: List[Tree], filter: (Tree) => Boolean): List[Tree] =
    for (expr <- exprs; t: Tree <- flatten(expr,filter)) yield t

  def flatten(expr: Tree, filter: (Tree) => Boolean): List[Tree] =
    if (filter(expr)) expr :: Nil; else expr match {
      case Block(stats, last) =>
        flatten0(stats, filter) ::: flatten(last, filter)
      case If(cond, thenp, elsep) =>
        flatten(cond,filter) ::: flatten(thenp,filter) ::: flatten(elsep,filter);
      case Assign(lhs, rhs) =>
        flatten(rhs, filter)
      case CaseDef(pat, guard, body) =>
        flatten(body, filter)
      case Return(expr0) =>
        flatten(expr0, filter)
      case Throw(expr0) =>
        flatten(expr0,filter)
      case Try(block, catches, finalizer) =>
        flatten(block, filter) ::: flatten(finalizer, filter) ::: flatten0(catches, filter)
      case Match(selector, cases) =>
        flatten(selector, filter) ::: flatten0(cases, filter)
      case Apply(fun, args) =>
        flatten(fun, filter) ::: flatten0(args, filter)
      case TypeApply(fun, args) =>
        flatten(fun, filter) ::: flatten0(args, filter)
      case _ =>
        Nil
    }

  def modelFor(tree: Tree, parent: Composite): HasTree = tree match {
    case _: ValDef       => new ValMod(parent)
    case _: DefDef       => new DefMod(parent)
    case _: ClassDef     => new ClassMod(parent)
    case _: ModuleDef    => new ObjectMod(parent)
    case _: TypeDef      => new TypeMod(parent)
    case _: Import       => new ImportMod(parent)
  }

}

Other Scala examples (source code examples)

Here is a short list of links related to this Scala Models.scala source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2019 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.