Packages

  • package root
    Definition Classes
    root
  • package scala
    Definition Classes
    root
  • package reflect
    Definition Classes
    scala
  • package api

    EXPERIMENTAL

    EXPERIMENTAL

    The Scala Reflection API (located in scala-reflect.jar).

    In Scala 2.10.0, the Scala Reflection API and its implementation have an "experimental" status. This means that the API and the docs are not complete and can be changed in binary- and source-incompatible manner in 2.10.1. This also means that the implementation has some known issues.

    The following types are the backbone of the Scala Reflection API, and serve as a good starting point for information about Scala Reflection:

    For more information about Scala Reflection, see the Reflection Guide

    Definition Classes
    reflect
  • trait Printers extends AnyRef

    EXPERIMENTAL

    EXPERIMENTAL

    Utilities for nicely printing scala.reflect.api.Trees and scala.reflect.api.Types.

    Printing Trees

    The method show displays the "prettified" representation of reflection artifacts. This representation provides one with the desugared Java representation of Scala code. For example:

    scala> import scala.reflect.runtime.universe._
    import scala.reflect.runtime.universe._
    
    scala> def tree = reify{ final class C { def x = 2 } }.tree
    tree: reflect.runtime.universe.Tree
    
    scala> show(tree)
    res0: String =
    {
      final class C extends AnyRef {
        def <init>() = {
          super.<init>();
          ()
        };
        def x = 2
      };
      ()
    }

    The method showRaw displays internal structure of a given reflection object as a Scala abstract syntax tree (AST), the representation that the Scala typechecker operates on.

    Note, that while this representation appears to generate correct trees that one might think would be possible to use in a macro implementation, this is not usually the case. Symbols aren't fully represented (only their names are). Thus, this method is best-suited for use simply inspecting ASTs given some valid Scala code.

    scala> showRaw(tree)
    res1: String = Block(List(
      ClassDef(Modifiers(FINAL), TypeName("C"), List(), Template(
        List(Ident(TypeName("AnyRef"))),
        noSelfType,
        List(
          DefDef(Modifiers(), nme.CONSTRUCTOR, List(), List(List()), TypeTree(),
            Block(List(
              Apply(Select(Super(This(tpnme.EMPTY), tpnme.EMPTY), nme.CONSTRUCTOR), List())),
              Literal(Constant(())))),
          DefDef(Modifiers(), TermName("x"), List(), List(), TypeTree(),
            Literal(Constant(2))))))),
      Literal(Constant(())))

    The method showRaw can also print scala.reflect.api.Types next to the artifacts being inspected

    scala> import scala.tools.reflect.ToolBox // requires scala-compiler.jar
    import scala.tools.reflect.ToolBox
    
    scala> import scala.reflect.runtime.{currentMirror => cm}
    import scala.reflect.runtime.{currentMirror=>cm}
    
    scala> showRaw(cm.mkToolBox().typecheck(tree), printTypes = true)
    res2: String = Block[1](List(
      ClassDef[2](Modifiers(FINAL), TypeName("C"), List(), Template[3](
        List(Ident[4](TypeName("AnyRef"))),
        noSelfType,
        List(
          DefDef[2](Modifiers(), nme.CONSTRUCTOR, List(), List(List()), TypeTree[3](),
            Block[1](List(
              Apply[4](Select[5](Super[6](This[3](TypeName("C")), tpnme.EMPTY), ...))),
              Literal[1](Constant(())))),
          DefDef[2](Modifiers(), TermName("x"), List(), List(), TypeTree[7](),
            Literal[8](Constant(2))))))),
      Literal[1](Constant(())))
    [1] TypeRef(ThisType(scala), scala.Unit, List())
    [2] NoType
    [3] TypeRef(NoPrefix, TypeName("C"), List())
    [4] TypeRef(ThisType(java.lang), java.lang.Object, List())
    [5] MethodType(List(), TypeRef(ThisType(java.lang), java.lang.Object, List()))
    [6] SuperType(ThisType(TypeName("C")), TypeRef(... java.lang.Object ...))
    [7] TypeRef(ThisType(scala), scala.Int, List())
    [8] ConstantType(Constant(2))
    Printing Types

    The method show

    scala> import scala.reflect.runtime.universe._
    import scala.reflect.runtime.universe._
    
    scala> def tpe = typeOf[{ def x: Int; val y: List[Int] }]
    tpe: reflect.runtime.universe.Type
    
    scala> show(tpe)
    res0: String = scala.AnyRef{def x: Int; val y: scala.List[Int]}

    Like the method showRaw for scala.reflect.api.Trees, showRaw for scala.reflect.api.Types provides a visualization of the Scala AST operated on by the Scala typechecker.

    // showRaw has already been discussed above
    scala> showRaw(tpe)
    res1: String = RefinedType(
      List(TypeRef(ThisType(scala), TypeName("AnyRef"), List())),
      Scope(
        TermName("x"),
        TermName("y")))

    printIds and/or printKinds can additionally be supplied as arguments in a call to showRaw which additionally shows the unique identifiers of symbols.

    scala> showRaw(tpe, printIds = true, printKinds = true)
    res2: String = RefinedType(
      List(TypeRef(ThisType(scala#2043#PK), TypeName("AnyRef")#691#TPE, List())),
      Scope(
        TermName("x")#2540#METH,
        TermName("y")#2541#GET))

    For more details about Printers and other aspects of Scala reflection, see the Reflection Guide

    Definition Classes
    api
  • BooleanFlag
  • TreePrinter

object BooleanFlag extends java.io.Serializable

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  1. final def !=(arg0: Any): Boolean
    Definition Classes
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  2. final def ##: Int
    Definition Classes
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  3. final def ==(arg0: Any): Boolean
    Definition Classes
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  4. final def asInstanceOf[T0]: T0
    Definition Classes
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  5. implicit def booleanToBooleanFlag(value: Boolean): Universe.BooleanFlag
  6. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
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    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  7. final def eq(arg0: AnyRef): Boolean
    Definition Classes
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  8. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  9. def finalize(): Unit
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  10. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
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  11. def hashCode(): Int
    Definition Classes
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    @native()
  12. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  13. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  14. final def notify(): Unit
    Definition Classes
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    @native()
  15. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  16. implicit def optionToBooleanFlag(value: Option[Boolean]): Universe.BooleanFlag
  17. implicit def settingToBooleanFlag(setting: BooleanSetting): Universe.BooleanFlag
  18. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  19. def toString(): String
    Definition Classes
    AnyRef → Any
  20. final def wait(): Unit
    Definition Classes
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    @throws(classOf[java.lang.InterruptedException])
  21. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
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    @throws(classOf[java.lang.InterruptedException])
  22. final def wait(arg0: Long): Unit
    Definition Classes
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    @throws(classOf[java.lang.InterruptedException]) @native()

Inherited from java.io.Serializable

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