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package dotty.tools
package dotc
package typer
import core._
import ast._
import Trees._, Constants._, StdNames._, Scopes._
import Contexts._, Symbols._, Types._, SymDenotations._, Names._, NameOps._, Flags._, Decorators._
import util.Positions._
import util.SourcePosition
import collection.mutable
import language.implicitConversions
trait NamerContextOps { ctx: Context =>
def enterSym(sym: Symbol) = ctx.owner match {
case cls: ClassSymbol => cls.enter(sym)
case _ => this.scope.asInstanceOf[MutableScope].enter(sym)
}
}
class Namer(val typer: Typer) {
import untpd._
val expandedTrees = new mutable.WeakHashMap[Tree, Tree]()
val symOfTree = mutable.Map[Tree, Symbol]()
implicit def sourcePos(pos: Position)(implicit ctx: Context): SourcePosition =
ctx.source.atPos(pos)
implicit def posToCoord(pos: Position): Coord = positionCoord(pos)
def enclosingStats(implicit ctx: Context): List[Trees.Tree[_ >: Untyped]] =
if (ctx == NoContext) Nil
else ctx.tree match {
case Template(_, _, _, stats) => stats
case Block(stats, _) => stats
case PackageDef(_, stats) => stats
case _ => enclosingStats(ctx.outer)
}
def privateWithinClass(mods: Modifiers)(implicit ctx: Context): Symbol = {
val pw = mods.privateWithin
if (pw.isEmpty) NoSymbol
else {
val cls = ctx.owner.enclosingClassNamed(pw)
if (!cls.exists) ctx.error(s"no enclosing class or object is named $pw", mods.pos)
cls
}
}
def createSymbol(tree: Tree, original: Tree)(implicit ctx: Context): Symbol = {
def createSym(name: Name, flags: FlagSet, privateWithin: Symbol) = {
val sym = ctx.newSymbol(ctx.owner, name, flags, new Completer(original), privateWithin, original.pos)
symOfTree(original) = sym
sym
}
tree match {
case tree: ModDefTree =>
val sym = createSym(tree.name, tree.mods.flags, privateWithinClass(tree.mods))
ctx.enterSym(sym)
sym
case imp: Import =>
createSym(nme.IMPORT, Synthetic, NoSymbol)
case _ =>
NoSymbol
}
}
val synthetic = Modifiers(Synthetic)
def expansion(tree: Tree)(implicit ctx: Context): Tree = {
def classTypeRef(cdef: ClassDef) = {
val tycon = Ident(cdef.name)
if (cdef.tparams.isEmpty) tycon else AppliedTypeTree(tycon, cdef.tparams map refOfDef)
}
def creator(cdef: ClassDef) =
New(classTypeRef(cdef), cdef.impl.constr.vparamss.nestedMap(refOfDef))
def methTypeParams(cdef: ClassDef) =
for (tparam <- cdef.tparams) yield
tparam.derivedTypeDef(Modifiers(TypeParam), tparam.name, tparam.tparams, tparam.rhs)
def methParamss(cdef: ClassDef) =
cdef.impl.constr.vparamss.nestedMap(vparam =>
vparam.derivedValDef(Modifiers(TermParam), vparam.name, vparam.tpt, vparam.rhs))
def expandCaseClass(cdef: ClassDef): ClassDef = {
val ClassDef(mods, cname, tparams, impl @ Template(constr, parents, self, stats)) = cdef
val constr1 =
if (constr.vparamss.nonEmpty) constr
else {
ctx.error("case class needs to have at least one parameter list", cdef.pos)
constr.derivedDefDef(constr.mods, constr.name, constr.tparams, ListOfNil, constr.tpt, constr.rhs)
}
val caseParams = constr1.vparamss.head
val caseParamsArray = caseParams.toArray
def syntheticProperty(name: TermName, rhs: Tree) = DefDef(synthetic, name, Nil, Nil, EmptyTree, rhs)
val isDefinedMeth = syntheticProperty(nme.isDefined, Literal(Constant(true)))
val productArityMeth = syntheticProperty(nme.productArity, Literal(Constant(caseParamsArray.length)))
val productElemMeths = for (i <- 0 until caseParamsArray.length) yield
syntheticProperty(("_" + (i + 1)).toTermName, Select(This(EmptyTypeName), caseParamsArray(i).name))
val (copyMeths, applyMeths) =
if (mods is Abstract) (Nil, Nil)
else {
val copyFirstParams = caseParams.map(vparam =>
vparam.derivedValDef(Modifiers(TermParam), vparam.name, vparam.tpt, refOfDef(vparam)))
val copyRestParamss = constr1.vparamss.tail.nestedMap(vparam =>
vparam.derivedValDef(Modifiers(TermParam), vparam.name, vparam.tpt, EmptyTree))
val applyParamss = constr1.vparamss.nestedMap(vparam =>
vparam.derivedValDef(Modifiers(TermParam), vparam.name, vparam.tpt, vparam.rhs))
val copyMeth =
DefDef(synthetic, nme.copy, methTypeParams(cdef), copyFirstParams :: copyRestParamss, EmptyTree, creator(cdef))
val applyMeth =
DefDef(synthetic, nme.apply, methTypeParams(cdef), methParamss(cdef), EmptyTree, creator(cdef))
(copyMeth :: Nil, applyMeth :: Nil)
}
val unapplyMeth = {
val unapplyParam = makeSyntheticParameter(tpt = classTypeRef(cdef))
DefDef(synthetic, nme.unapply, methTypeParams(cdef), (unapplyParam :: Nil) :: Nil, EmptyTree, This(EmptyTypeName))
}
updateCompanion(cname.toTermName, applyMeths ::: unapplyMeth :: Nil)
addToClass(cdef, copyMeths ::: isDefinedMeth :: productArityMeth :: productElemMeths.toList)
}
def addToTemplate(templ: Template, stats: List[Tree]): Template =
templ.derivedTemplate(templ.constr, templ.parents, templ.self, templ.body ++ stats)
def addToClass(cdef: ClassDef, stats: List[Tree]): ClassDef =
cdef.derivedClassDef(cdef.mods, cdef.name, cdef.tparams, addToTemplate(cdef.impl, stats))
def addToModule(mdef: ModuleDef, stats: List[Tree]): ModuleDef =
mdef.derivedModuleDef(mdef.mods, mdef.name, addToTemplate(mdef.impl, stats))
def updateCompanion(name: TermName, newDefs: List[Tree]) =
for (companion @ ModuleDef(_, `name`, _) <- enclosingStats) {
expandedTrees(companion) = expandedTrees get companion match {
case Some(Thicket(vdef :: (cdef: ClassDef) :: Nil)) =>
Thicket(vdef, addToClass(cdef, newDefs))
case none =>
addToModule(companion, newDefs)
}
}
def implicitWrapper(cdef: ClassDef) =
DefDef(Modifiers(Synthetic | Implicit), cdef.name.toTermName,
methTypeParams(cdef), methParamss(cdef), EmptyTree, creator(cdef))
val tree1 = tree match {
case ValDef(mods, name, tpt, rhs) =>
if (!ctx.owner.isClass || (mods is Private)) tree
else {
val lname = name.toLocalName
val field = tree.derivedValDef(mods, lname, tpt, rhs)
val getter = tree.derivedDefDef(mods, name, Nil, Nil, tpt, Ident(lname))
if (!(mods is Mutable)) Thicket(field, getter)
else {
val setterParam = makeSyntheticParameter(tpt = TypeTree(field))
val setter = tree.derivedDefDef(
mods, name.getterToSetter, Nil, (setterParam :: Nil) :: Nil, EmptyTree, refOfDef(setterParam))
Thicket(field, getter, setter)
}
}
case mdef: ModuleDef =>
desugarModuleDef {
expandedTrees get mdef match {
case Some(mdef1: ModuleDef) => mdef
case _ => mdef
}
}
case cdef: ClassDef =>
val result = if (cdef.mods is Case) expandCaseClass(cdef) else cdef
if (cdef.mods is Implicit) {
if (ctx.owner is Package)
ctx.error("implicit classes may not be toplevel", cdef.pos)
Thicket(result :: implicitWrapper(cdef) :: Nil)
}
else result
case _ =>
tree
}
if (tree1 ne tree) expandedTrees(tree) = tree1
tree1
}
def enterSyms(stats: List[Tree])(implicit ctx: Context): Unit = stats match {
case (imp @ Import(expr, selectors)) :: rest =>
val sym = createSymbol(imp, imp)
enterSyms(rest)(ctx.fresh.withImport(ImportInfo(sym, selectors, ctx.scopeNestingLevel)))
case stat :: rest =>
for (expanded <- expansion(stat).toList) createSymbol(expanded, stat)
enterSyms(rest)
case Nil =>
}
class Completer(tree: Tree)(implicit ctx: Context) extends LazyType {
def complete(sym: SymDenotation): Unit = {
for (defn <- expandedTrees.getOrElse(tree, tree).toList if symOfTree(defn) == sym)
defn match {
case ValDef(mods, name, tpt, rhs) =>
val (tpt1, rhs1) =
if (tpt.isEmpty) {
val rhs1 = typer.typedExpr(rhs)
(TypeTree().withType(rhs1.tpe), TypedSplice(rhs1))
}
else (typer.typedType(tpt), rhs)
defn.derivedValDef(mods, name, TypedSplice(tpt1), rhs1)
}
}
}
}
}
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