Scala Reflection Library2.12.3-1 < Back
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# 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:

  - scala.reflect.api.Symbols
  - scala.reflect.api.Types
  - scala.reflect.api.Mirrors
  - scala.reflect.api.Universe

  For more information about Scala Reflection, see the Reflection Guide

  Definition Classes
    reflect
-  trait Trees extends AnyRef

  EXPERIMENTAL

  EXPERIMENTAL

  This trait defines the node types used in Scala abstract syntax trees (AST) and operations on them.

  Trees are the basis for Scala's abstract syntax that is used to represent programs. They are also called abstract syntax trees and commonly abbreviated as ASTs.

  In Scala reflection, APIs that produce or use `Tree`s are:

  - Annotations which use trees to represent their arguments, exposed in Annotation.scalaArgs.
  - reify, a special method on scala.reflect.api.Universe that takes an expression and returns an AST which represents the expression.
  - Macros and runtime compilation with toolboxes which both use trees as their program representation medium.

  Trees are immutable, except for three fields pos, symbol, and tpe, which are assigned when a tree is typechecked to attribute it with the information gathered by the typechecker.

  ##### Examples

  The following creates an AST representing a literal 5 in Scala source code:

      Literal(Constant(5))

  The following creates an AST representing `print("Hello World")`:

      Apply(Select(Select(This(TypeName("scala")), TermName("Predef")), TermName("print")), List(Literal(Constant("Hello World"))))

  The following creates an AST from a literal 5, and then uses `showRaw` to print it in a readable format.

      import scala.reflect.runtime.universe.{ reify, showRaw }
      print( showRaw( reify{5}.tree ) )` // prints Literal(Constant(5))

  For more information about `Tree`s, see the Reflection Guide: Symbols, Trees, Types.

  Definition Classes
    api
- Alternative
- AlternativeApi
- AlternativeExtractor
- Annotated
- AnnotatedApi
- AnnotatedExtractor
- AppliedTypeTree
- AppliedTypeTreeApi
- AppliedTypeTreeExtractor
- Apply
- ApplyApi
- ApplyExtractor
- Assign
- AssignApi
- AssignExtractor
- AssignOrNamedArg
- AssignOrNamedArgApi
- AssignOrNamedArgExtractor
- Bind
- BindApi
- BindExtractor
- Block
- BlockApi
- BlockExtractor
- CaseDef
- CaseDefApi
- CaseDefExtractor
- ClassDef
- ClassDefApi
- ClassDefExtractor
- CompoundTypeTree
- CompoundTypeTreeApi
- CompoundTypeTreeExtractor
- DefDef
- DefDefApi
- DefDefExtractor
- DefTree
- DefTreeApi
- ExistentialTypeTree
- ExistentialTypeTreeApi
- ExistentialTypeTreeExtractor
- Function
- FunctionApi
- FunctionExtractor
- GenericApply
- GenericApplyApi
- Ident
- IdentApi
- IdentExtractor
- If
- IfApi
- IfExtractor
- ImplDef
- ImplDefApi
- Import
- ImportApi
- ImportExtractor
- ImportSelector
- ImportSelectorApi
- ImportSelectorExtractor
- LabelDef
- LabelDefApi
- LabelDefExtractor
- Literal
- LiteralApi
- LiteralExtractor
- Match
- MatchApi
- MatchExtractor
- MemberDef
- MemberDefApi
- Modifiers
- ModifiersApi
- ModifiersExtractor
- ModuleDef
- ModuleDefApi
- ModuleDefExtractor
- NameTree
- NameTreeApi
- New
- NewApi
- NewExtractor
- PackageDef
- PackageDefApi
- PackageDefExtractor
- RefTree
- RefTreeApi
- RefTreeExtractor
- Return
- ReturnApi
- ReturnExtractor
- Select
- SelectApi
- SelectExtractor
- SelectFromTypeTree
- SelectFromTypeTreeApi
- SelectFromTypeTreeExtractor
- SingletonTypeTree
- SingletonTypeTreeApi
- SingletonTypeTreeExtractor
- Star
- StarApi
- StarExtractor
- Super
- SuperApi
- SuperExtractor
- SymTree
- SymTreeApi
- Template
- TemplateApi
- TemplateExtractor
- TermTree
- TermTreeApi
- This
- ThisApi
- ThisExtractor
- Throw
- ThrowApi
- ThrowExtractor
- Transformer
- Traverser
- Tree
- TreeApi
- TreeCopier
- TreeCopierOps
- Try
- TryApi
- TryExtractor
- TypTree
- TypTreeApi
- TypeApply
- TypeApplyApi
- TypeApplyExtractor
- TypeBoundsTree
- TypeBoundsTreeApi
- TypeBoundsTreeExtractor
- TypeDef
- TypeDefApi
- TypeDefExtractor
- TypeTree
- TypeTreeApi
- TypeTreeExtractor
- Typed
- TypedApi
- TypedExtractor
- UnApply
- UnApplyApi
- UnApplyExtractor
- ValDef
- ValDefApi
- ValDefExtractor
- ValOrDefDef
- ValOrDefDefApi

c

scala.reflect.api.Trees

# Traverser 

###

#### class Traverser extends AnyRef

A class that implement a default tree traversal strategy: breadth-first component-wise.

Source
  Trees.scala

Linear Supertypes
AnyRef, Any
Type Hierarchy
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Ordering

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2. By Inheritance

Inherited

1. Traverser
2. AnyRef
3. Any

Implicitly

1. by any2stringadd
2. by StringFormat
3. by Ensuring
4. by ArrowAssoc

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Visibility

1. Public
2. All

### Instance Constructors

1.  new Traverser()

### 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.Traverser to any2stringadd[Universe.Traverser] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd
4.  def ->[B](y: B): (Universe.Traverser, B)
   Implicit
     This member is added by an implicit conversion from Universe.Traverser to ArrowAssoc[Universe.Traverser] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()
5.  final def ==(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
6.  def apply[T <: Universe.Tree](tree: T): T

   Leave apply available in the generic traverser to do something else.

7.  final def asInstanceOf[T0]: T0
   Definition Classes
     Any
8.  def atOwner(owner: Universe.Symbol)(traverse: ⇒ Unit): Unit

   Performs a traversal with a given owner symbol.

9.  def clone(): AnyRef
   Attributes
     protected[java.lang]
   Definition Classes
     AnyRef
   Annotations
     @throws( ... )
10.  var currentOwner: Universe.Symbol
    Attributes
      protected[scala]
11.  def ensuring(cond: (Universe.Traverser) ⇒ Boolean, msg: ⇒ Any): Universe.Traverser
    Implicit
      This member is added by an implicit conversion from Universe.Traverser to Ensuring[Universe.Traverser] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
12.  def ensuring(cond: (Universe.Traverser) ⇒ Boolean): Universe.Traverser
    Implicit
      This member is added by an implicit conversion from Universe.Traverser to Ensuring[Universe.Traverser] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
13.  def ensuring(cond: Boolean, msg: ⇒ Any): Universe.Traverser
    Implicit
      This member is added by an implicit conversion from Universe.Traverser to Ensuring[Universe.Traverser] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
14.  def ensuring(cond: Boolean): Universe.Traverser
    Implicit
      This member is added by an implicit conversion from Universe.Traverser to Ensuring[Universe.Traverser] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
15.  final def eq(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
16.  def equals(arg0: Any): Boolean
    Definition Classes
      AnyRef → Any
17.  def finalize(): Unit
    Attributes
      protected[java.lang]
    Definition Classes
      AnyRef
    Annotations
      @throws( classOf[java.lang.Throwable] )
18.  def formatted(fmtstr: String): String
    Implicit
      This member is added by an implicit conversion from Universe.Traverser to StringFormat[Universe.Traverser] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()
19.  final def getClass(): Class[_]
    Definition Classes
      AnyRef → Any
20.  def hashCode(): Int
    Definition Classes
      AnyRef → Any
21.  final def isInstanceOf[T0]: Boolean
    Definition Classes
      Any
22.  final def ne(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
23.  final def notify(): Unit
    Definition Classes
      AnyRef
24.  final def notifyAll(): Unit
    Definition Classes
      AnyRef
25.  final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
      AnyRef
26.  def toString(): String
    Definition Classes
      AnyRef → Any
27.  def traverse(tree: Universe.Tree): Unit

    Traverses a single tree.

28.  def traverseAnnotations(annots: List[Universe.Tree]): Unit
29.  def traverseCases(cases: List[Universe.CaseDef]): Unit
30.  def traverseConstant(c: Universe.Constant): Unit
31.  def traverseGuard(guard: Universe.Tree): Unit
32.  def traverseImportSelector(sel: Universe.ImportSelector): Unit
33.  def traverseModifiers(mods: Universe.Modifiers): Unit
34.  def traverseName(name: Universe.Name): Unit

    Traverse something which Trees contain, but which isn't a Tree itself.

35.  def traverseParams(params: List[Universe.Tree]): Unit
36.  def traverseParamss(vparamss: List[List[Universe.Tree]]): Unit
37.  def traverseParents(parents: List[Universe.Tree]): Unit
38.  def traversePattern(pat: Universe.Tree): Unit
39.  def traverseSelfType(self: Universe.ValDef): Unit
40.  def traverseStats(stats: List[Universe.Tree], exprOwner: Universe.Symbol): Unit

    Traverses a list of trees with a given owner symbol.

41.  def traverseTrees(trees: List[Universe.Tree]): Unit

    Traverses a list of trees.

42.  def traverseTreess(treess: List[List[Universe.Tree]]): Unit

    Traverses a list of lists of trees.

43.  def traverseTypeArgs(args: List[Universe.Tree]): Unit
44.  def traverseTypeAscription(tpt: Universe.Tree): Unit
45.  final def wait(): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
46.  final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
47.  final def wait(arg0: Long): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
48.  def →[B](y: B): (Universe.Traverser, B)
    Implicit
      This member is added by an implicit conversion from Universe.Traverser to ArrowAssoc[Universe.Traverser] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd from Universe.Traverser to any2stringadd[Universe.Traverser]

### Inherited by implicit conversion StringFormat from Universe.Traverser to StringFormat[Universe.Traverser]

### Inherited by implicit conversion Ensuring from Universe.Traverser to Ensuring[Universe.Traverser]

### Inherited by implicit conversion ArrowAssoc from Universe.Traverser to ArrowAssoc[Universe.Traverser]

### Ungrouped