Packages

  • package root

    The Scala compiler and reflection APIs.

    The Scala compiler and reflection APIs.

    Definition Classes
    root
  • package scala
    Definition Classes
    root
  • package tools
    Definition Classes
    scala
  • package nsc
    Definition Classes
    tools
  • package transform
    Definition Classes
    nsc
  • package patmat
    Definition Classes
    transform
  • 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, ...

    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.

    Definition Classes
    patmat
  • Aligned
  • Extractor
  • NoRepeated
  • Patterns
  • Repeated
  • TypedPat

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

If elementArity is... 0: A perfect match between extractor and the fixed patterns. If there is a star pattern it will match any sequence. > 0: There are more patterns than products. There will have to be a sequence which can populate at least <elementArity> patterns. < 0: There are more products than patterns: compile time error.

Source
PatternExpander.scala
Linear Supertypes
Serializable, java.io.Serializable, Product, Equals, AnyRef, Any
Type Hierarchy
Ordering
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  2. By Inheritance
Inherited
  1. Aligned
  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
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new Aligned(patterns: Patterns, extractor: Extractor)

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 Aligned to any2stringadd[Aligned] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. def ->[B](y: B): (Aligned, B)
    Implicit
    This member is added by an implicit conversion from Aligned to ArrowAssoc[Aligned] 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 elementArity: Int
  9. def ensuring(cond: (Aligned) ⇒ Boolean, msg: ⇒ Any): Aligned
    Implicit
    This member is added by an implicit conversion from Aligned to Ensuring[Aligned] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  10. def ensuring(cond: (Aligned) ⇒ Boolean): Aligned
    Implicit
    This member is added by an implicit conversion from Aligned to Ensuring[Aligned] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  11. def ensuring(cond: Boolean, msg: ⇒ Any): Aligned
    Implicit
    This member is added by an implicit conversion from Aligned to Ensuring[Aligned] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  12. def ensuring(cond: Boolean): Aligned
    Implicit
    This member is added by an implicit conversion from Aligned to Ensuring[Aligned] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  13. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  14. def extractedTypes: collection.immutable.List[Type]
  15. val extractor: Extractor
  16. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  17. def formatted(fmtstr: String): String
    Implicit
    This member is added by an implicit conversion from Aligned to StringFormat[Aligned] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  18. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
  19. def isBool: Boolean
  20. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  21. def isSeq: Boolean
  22. def isSingle: Boolean
  23. def isStar: Boolean
  24. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  25. final def notify(): Unit
    Definition Classes
    AnyRef
  26. final def notifyAll(): Unit
    Definition Classes
    AnyRef
  27. val patterns: Patterns
  28. def productArity: Int
    Definition Classes
    Aligned → Product
  29. def productTypes: List[Type]
  30. def sequenceType: Type
  31. def starArity: Int
  32. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  33. def toString(): String
    Definition Classes
    Aligned → AnyRef → Any
  34. def totalArity: Int
  35. def typedNonStarPatterns: collection.immutable.List[TypedPat]
  36. def typedPatterns: collection.immutable.List[TypedPat]
  37. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  38. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  39. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  40. def wholeType: Type
  41. def →[B](y: B): (Aligned, B)
    Implicit
    This member is added by an implicit conversion from Aligned to ArrowAssoc[Aligned] 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 Aligned to any2stringadd[Aligned]

Inherited by implicit conversion StringFormat from Aligned to StringFormat[Aligned]

Inherited by implicit conversion Ensuring from Aligned to Ensuring[Aligned]

Inherited by implicit conversion ArrowAssoc from Aligned to ArrowAssoc[Aligned]

Ungrouped