scala.tools.nsc.transform.patmat

PatternExpander

trait PatternExpander[Pattern, Type] extends AnyRef

An extractor returns: F1, F2, ..., Fi, opt[Seq[E] or E*] A case matches: P1, P2, ..., Pj, opt[Seq[E]] Put together: P1/F1, P2/F2, ... Pi/Fi, Pi+1/E, Pi+2/E, ... Pj/E, opt[Seq[E]]

Here Pm/Fi is the last pattern to match the fixed arity section.

productArity: the value of i, i.e. the number of non-sequence types in the extractor nonStarArity: the value of j, i.e. the number of non-star patterns in the case definition elementArity: j - i, i.e. the number of non-star patterns which must match sequence elements starArity: 1 or 0 based on whether there is a star (sequence-absorbing) pattern totalArity: nonStarArity + starArity, i.e. the number of patterns in the case definition

Note that productArity is a function only of the extractor, and nonStar/star/totalArity are all functions of the patterns. The key value for aligning and typing the patterns is elementArity, as it is derived from both sets of information.

Linear Supertypes
AnyRef, Any
Known Subclasses
ScalacPatternExpander, alignPatterns
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  1. PatternExpander
  2. AnyRef
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  1. by StringAdd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
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Type Members

  1. final case class Aligned(patterns: Patterns, extractor: Extractor) extends Product with Serializable

    If elementArity is.

  2. final case class Extractor(whole: Type, fixed: List[Type], repeated: Repeated) extends Product with Serializable

    An 'extractor' can be a case class or an unapply or unapplySeq method.

  3. final case class Patterns(fixed: List[Pattern], star: Pattern) extends Product with Serializable

  4. sealed case class Repeated(sequenceType: Type, elementType: Type, repeatedType: Type) extends Product with Serializable

    It's not optimal that we're carrying both sequence and repeated type here, but the implementation requires more unraveling before it can be avoided.

  5. final case class TypedPat(pat: Pattern, tpe: Type) extends Product with Serializable

Abstract Value Members

  1. abstract def NoPattern: Pattern

    You'll note we're not inside the cake.

    You'll note we're not inside the cake. "Pattern" and "Type" are arbitrary types here, and NoPattern and NoType arbitrary values.

  2. abstract def NoType: Type

Concrete Value Members

  1. final def !=(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  2. final def !=(arg0: Any): Boolean

    Definition Classes
    Any

  3. final def ##(): Int

    Definition Classes
    AnyRef → Any

  4. def +(other: String): String

    Implicit information
    This member is added by an implicit conversion from PatternExpander[Pattern, Type] to StringAdd[PatternExpander[Pattern, Type]] performed by method StringAdd in scala.Predef.
    Definition Classes
    StringAdd

  5. def ->[B](y: B): (PatternExpander[Pattern, Type], B)

    Implicit information
    This member is added by an implicit conversion from PatternExpander[Pattern, Type] to ArrowAssoc[PatternExpander[Pattern, Type]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()

  6. final def ==(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  7. final def ==(arg0: Any): Boolean

    Definition Classes
    Any

  8. object NoRepeated extends Repeated

  9. final def asInstanceOf[T0]: T0

    Definition Classes
    Any

  10. def clone(): AnyRef

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  11. def ensuring(cond: (PatternExpander[Pattern, Type]) ⇒ Boolean, msg: ⇒ Any): PatternExpander[Pattern, Type]

    Implicit information
    This member is added by an implicit conversion from PatternExpander[Pattern, Type] to Ensuring[PatternExpander[Pattern, Type]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring

  12. def ensuring(cond: (PatternExpander[Pattern, Type]) ⇒ Boolean): PatternExpander[Pattern, Type]

    Implicit information
    This member is added by an implicit conversion from PatternExpander[Pattern, Type] to Ensuring[PatternExpander[Pattern, Type]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring

  13. def ensuring(cond: Boolean, msg: ⇒ Any): PatternExpander[Pattern, Type]

    Implicit information
    This member is added by an implicit conversion from PatternExpander[Pattern, Type] to Ensuring[PatternExpander[Pattern, Type]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring

  14. def ensuring(cond: Boolean): PatternExpander[Pattern, Type]

    Implicit information
    This member is added by an implicit conversion from PatternExpander[Pattern, Type] to Ensuring[PatternExpander[Pattern, Type]] 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 information
    This member is added by an implicit conversion from PatternExpander[Pattern, Type] to StringFormat[PatternExpander[Pattern, Type]] 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. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  28. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  29. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  30. def →[B](y: B): (PatternExpander[Pattern, Type], B)

    Implicit information
    This member is added by an implicit conversion from PatternExpander[Pattern, Type] to ArrowAssoc[PatternExpander[Pattern, Type]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion StringAdd from PatternExpander[Pattern, Type] to StringAdd[PatternExpander[Pattern, Type]]

Inherited by implicit conversion StringFormat from PatternExpander[Pattern, Type] to StringFormat[PatternExpander[Pattern, Type]]

Inherited by implicit conversion Ensuring from PatternExpander[Pattern, Type] to Ensuring[PatternExpander[Pattern, Type]]

Inherited by implicit conversion ArrowAssoc from PatternExpander[Pattern, Type] to ArrowAssoc[PatternExpander[Pattern, Type]]

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