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package dotty.tools.dotc
package core
import Symbols._, Types._, util.Positions._, Contexts._, Constants._, ast.tpd._
import config.ScalaVersion
object Annotations {
abstract class Annotation {
def tree(implicit ctx: Context): Tree
def symbol(implicit ctx: Context): Symbol =
if (tree.symbol.isConstructor) tree.symbol.owner
else tree.tpe.typeSymbol
def matches(cls: Symbol)(implicit ctx: Context): Boolean = symbol.derivesFrom(cls)
def appliesToModule: Boolean = true // for now; see remark in SymDenotations
def derivedAnnotation(tree: Tree)(implicit ctx: Context) =
if (tree eq this.tree) this else Annotation(tree)
def arguments(implicit ctx: Context) = ast.tpd.arguments(tree)
def argument(i: Int)(implicit ctx: Context): Option[Tree] = {
val args = arguments
if (i < args.length) Some(args(i)) else None
}
def argumentConstant(i: Int)(implicit ctx: Context): Option[Constant] =
for (ConstantType(c) <- argument(i) map (_.tpe)) yield c
}
case class ConcreteAnnotation(t: Tree) extends Annotation {
def tree(implicit ctx: Context): Tree = t
}
case class LazyAnnotation(sym: Symbol)(treeFn: Context => Tree) extends Annotation {
private var myTree: Tree = null
def tree(implicit ctx: Context) = {
if (myTree == null) myTree = treeFn(ctx)
myTree
}
override def symbol(implicit ctx: Context): Symbol = sym
}
object Annotation {
def apply(tree: Tree) = ConcreteAnnotation(tree)
def apply(cls: ClassSymbol, arg: Tree)(implicit ctx: Context): Annotation =
apply(cls, arg :: Nil)
def apply(cls: ClassSymbol, arg1: Tree, arg2: Tree)(implicit ctx: Context): Annotation =
apply(cls, arg1 :: arg2 :: Nil)
def apply(cls: ClassSymbol, args: List[Tree])(implicit ctx: Context): Annotation =
apply(cls.typeRef, args)
def apply(atp: Type, arg: Tree)(implicit ctx: Context): Annotation =
apply(atp, arg :: Nil)
def apply(atp: Type, arg1: Tree, arg2: Tree)(implicit ctx: Context): Annotation =
apply(atp, arg1 :: arg2 :: Nil)
def apply(atp: Type, args: List[Tree])(implicit ctx: Context): Annotation =
apply(New(atp, args))
def deferred(sym: Symbol, treeFn: Context => Tree)(implicit ctx: Context): Annotation =
new LazyAnnotation(sym)(treeFn)
def deferred(atp: Type, args: List[Tree])(implicit ctx: Context): Annotation =
deferred(atp.classSymbol, implicit ctx => New(atp, args))
def makeAlias(sym: TermSymbol)(implicit ctx: Context) =
apply(defn.AliasAnnot, List(Ident(TermRef.withSig(sym.owner.thisType, sym.name, sym.signature, sym))))
def makeChild(sym: Symbol)(implicit ctx: Context) =
apply(defn.ChildAnnot.typeRef.appliedTo(sym.owner.thisType.select(sym.name, sym)), Nil)
}
def ThrowsAnnotation(cls: ClassSymbol)(implicit ctx: Context) = {
val tref = cls.typeRef
Annotation(defn.ThrowsAnnot.typeRef.appliedTo(tref), Ident(tref))
}
/** A decorator that provides queries for specific annotations
* of a symbol.
*/
implicit class AnnotInfo(val sym: Symbol) extends AnyVal {
def isDeprecated(implicit ctx: Context) =
sym.hasAnnotation(defn.DeprecatedAnnot)
def deprecationMessage(implicit ctx: Context) =
for (annot <- sym.getAnnotation(defn.DeprecatedAnnot);
arg <- annot.argumentConstant(0))
yield arg.stringValue
def migrationVersion(implicit ctx: Context) =
for (annot <- sym.getAnnotation(defn.MigrationAnnot);
arg <- annot.argumentConstant(1))
yield ScalaVersion.parse(arg.stringValue)
def migrationMessage(implicit ctx: Context) =
for (annot <- sym.getAnnotation(defn.MigrationAnnot);
arg <- annot.argumentConstant(0))
yield ScalaVersion.parse(arg.stringValue)
}
}
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