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

case class BooleanFlag(value: Option[Boolean]) extends Product with Serializable

Source
Printers.scala
Linear Supertypes
Serializable, java.io.Serializable, Product, Equals, AnyRef, Any
Type Hierarchy
Ordering
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  2. By Inheritance
Inherited
  1. BooleanFlag
  2. Serializable
  3. Serializable
  4. Product
  5. Equals
  6. AnyRef
  7. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
  1. Hide All
  2. Show All
Visibility
  1. Public
  2. All

Instance Constructors

  1. new BooleanFlag(value: Option[Boolean])

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. def +(other: String): String
    Implicit
    This member is added by an implicit conversion from Universe.BooleanFlag to any2stringadd[Universe.BooleanFlag] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. def ->[B](y: B): (Universe.BooleanFlag, B)
    Implicit
    This member is added by an implicit conversion from Universe.BooleanFlag to ArrowAssoc[Universe.BooleanFlag] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  5. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  6. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  7. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  8. def ensuring(cond: (Universe.BooleanFlag) ⇒ Boolean, msg: ⇒ Any): Universe.BooleanFlag
    Implicit
    This member is added by an implicit conversion from Universe.BooleanFlag to Ensuring[Universe.BooleanFlag] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  9. def ensuring(cond: (Universe.BooleanFlag) ⇒ Boolean): Universe.BooleanFlag
    Implicit
    This member is added by an implicit conversion from Universe.BooleanFlag to Ensuring[Universe.BooleanFlag] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  10. def ensuring(cond: Boolean, msg: ⇒ Any): Universe.BooleanFlag
    Implicit
    This member is added by an implicit conversion from Universe.BooleanFlag to Ensuring[Universe.BooleanFlag] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  11. def ensuring(cond: Boolean): Universe.BooleanFlag
    Implicit
    This member is added by an implicit conversion from Universe.BooleanFlag to Ensuring[Universe.BooleanFlag] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  12. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  13. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  14. def formatted(fmtstr: String): String
    Implicit
    This member is added by an implicit conversion from Universe.BooleanFlag to StringFormat[Universe.BooleanFlag] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  15. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
  16. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  17. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  18. final def notify(): Unit
    Definition Classes
    AnyRef
  19. final def notifyAll(): Unit
    Definition Classes
    AnyRef
  20. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  21. val value: Option[Boolean]
  22. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  23. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  24. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  25. def →[B](y: B): (Universe.BooleanFlag, B)
    Implicit
    This member is added by an implicit conversion from Universe.BooleanFlag to ArrowAssoc[Universe.BooleanFlag] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Inherited from Serializable

Inherited from java.io.Serializable

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from Universe.BooleanFlag to any2stringadd[Universe.BooleanFlag]

Inherited by implicit conversion StringFormat from Universe.BooleanFlag to StringFormat[Universe.BooleanFlag]

Inherited by implicit conversion Ensuring from Universe.BooleanFlag to Ensuring[Universe.BooleanFlag]

Inherited by implicit conversion ArrowAssoc from Universe.BooleanFlag to ArrowAssoc[Universe.BooleanFlag]

Ungrouped