Packages

case class ProductExtractorTreeMaker(prevBinder: Global.Symbol, extraCond: Option[Global.Tree])(subPatBinders: List[Global.Symbol], subPatRefs: List[Global.Tree], mutableBinders: List[Global.Symbol], binderKnownNonNull: Boolean, ignoredSubPatBinders: Set[Global.Symbol]) extends FunTreeMaker with PreserveSubPatBinders with Product with Serializable

An optimized version of ExtractorTreeMaker for Products. For now, this is hard-coded to case classes, and we simply extract the case class fields.

The values for the subpatterns, as specified by the case class fields at the time of extraction, are stored in local variables that re-use the symbols in subPatBinders. This makes extractor patterns more debuggable (scala/bug#5739) as well as avoiding mutation after the pattern has been matched (scala/bug#5158, scala/bug#6070)

TODO: make this user-definable as follows When a companion object defines a method def unapply_1(x: T): U_1, but no def unapply or def unapplySeq, the extractor is considered to match any non-null value of type T the pattern is expected to have as many sub-patterns as there are def unapply_I(x: T): U_I methods, and the type of the I'th sub-pattern is U_I. The same exception for Seq patterns applies: if the last extractor is of type Seq[U_N], the pattern must have at least N arguments (exactly N if the last argument is annotated with : _*). The arguments starting at N (and beyond) are taken from the sequence returned by apply_N, and it is checked that that sequence has enough elements to provide values for all expected sub-patterns.

For a case class C, the implementation is assumed to be def unapply_I(x: C) = x._I, and the extractor call is inlined under that assumption.

Source
MatchTreeMaking.scala
Linear Supertypes
Serializable, java.io.Serializable, Product, Equals, PreserveSubPatBinders, FunTreeMaker, TreeMaker, AnyRef, Any
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Inherited
  1. ProductExtractorTreeMaker
  2. Serializable
  3. Serializable
  4. Product
  5. Equals
  6. PreserveSubPatBinders
  7. FunTreeMaker
  8. TreeMaker
  9. AnyRef
  10. 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 ProductExtractorTreeMaker(prevBinder: Global.Symbol, extraCond: Option[Global.Tree])(subPatBinders: List[Global.Symbol], subPatRefs: List[Global.Tree], mutableBinders: List[Global.Symbol], binderKnownNonNull: Boolean, ignoredSubPatBinders: Set[Global.Symbol])

Value Members

  1. def bindSubPats(in: Global.Tree): Global.Tree
    Definition Classes
    PreserveSubPatBinders
  2. def chainBefore(next: Global.Tree)(casegen: TreeMakers.Casegen): Global.Tree
    Definition Classes
    ProductExtractorTreeMaker → TreeMaker
  3. def emitVars: Boolean
    Definition Classes
    PreserveSubPatBinders
  4. val extraCond: Option[Global.Tree]
  5. def extraStoredBinders: Set[Global.Symbol]
    Definition Classes
    ProductExtractorTreeMaker → PreserveSubPatBinders
  6. val ignoredSubPatBinders: Set[Global.Symbol]
    Definition Classes
    ProductExtractorTreeMaker → PreserveSubPatBinders
  7. val mutableBinders: List[Global.Symbol]
  8. val nextBinder: Global.Symbol
    Definition Classes
    ProductExtractorTreeMaker → FunTreeMaker
  9. def pos: Global.Position
    Definition Classes
    FunTreeMaker → TreeMaker
  10. val prevBinder: Global.Symbol
  11. lazy val storedBinders: Set[Global.Symbol]
    Definition Classes
    PreserveSubPatBinders
  12. val subPatBinders: List[Global.Symbol]
    Definition Classes
    ProductExtractorTreeMaker → PreserveSubPatBinders
  13. val subPatRefs: List[Global.Tree]
    Definition Classes
    ProductExtractorTreeMaker → PreserveSubPatBinders
  14. def subPatternsAsSubstitution: TreeMakers.Substitution

    The substitution that specifies the trees that compute the values of the subpattern binders.

    The substitution that specifies the trees that compute the values of the subpattern binders.

    We pretend to replace the subpattern binders by subpattern refs (Even though we don't do so anymore -- see scala/bug#5158, scala/bug#5739 and scala/bug#6070.)

    Definition Classes
    PreserveSubPatBinders → TreeMaker
  15. def substitution: TreeMakers.Substitution

    captures the scope and the value of the bindings in patterns important *when* the substitution happens (can't accumulate and do at once after the full matcher has been constructed)

    captures the scope and the value of the bindings in patterns important *when* the substitution happens (can't accumulate and do at once after the full matcher has been constructed)

    Definition Classes
    TreeMaker
  16. def toString(): String
    Definition Classes
    ProductExtractorTreeMaker → AnyRef → Any