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class PureMatchTranslator extends MatchTranslator with PureCodegen

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Inherited
  1. PureMatchTranslator
  2. PureCodegen
  3. PureMatchMonadInterface
  4. MatchTranslator
  5. TreeMakerWarnings
  6. TreeMakers
  7. CodegenCore
  8. TypedSubstitution
  9. MatchMonadInterface
  10. AnyRef
  11. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
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Visibility
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Instance Constructors

  1. new PureMatchTranslator(typer: (analyzer)#Typer, matchStrategy: Global.Tree)

Type Members

  1. class Substitution extends AnyRef
    Definition Classes
    TypedSubstitution
  2. trait AbsCodegen extends AnyRef
    Definition Classes
    CodegenCore
  3. trait Casegen extends AbsCodegen
    Definition Classes
    CodegenCore
  4. abstract class CommonCodegen extends AbsCodegen
    Definition Classes
    CodegenCore
  5. final case class BoundTree (binder: Global.Symbol, tree: Global.Tree) extends Product with Serializable
    Definition Classes
    MatchTranslator
  6. abstract class ExtractorCall extends AnyRef
    Definition Classes
    MatchTranslator
  7. class ExtractorCallProd extends ExtractorCall
    Definition Classes
    MatchTranslator
  8. class ExtractorCallRegular extends ExtractorCall
    Definition Classes
    MatchTranslator
  9. final case class TranslationStep (makers: List[MatchTranslator.TreeMaker], subpatterns: List[BoundTree]) extends Product with Serializable
    Definition Classes
    MatchTranslator
  10. case class AlternativesTreeMaker (prevBinder: Global.Symbol, altss: List[List[TreeMaker]], pos: Global.Position) extends TreeMaker with NoNewBinders with Product with Serializable
    Definition Classes
    TreeMakers
  11. case class BodyTreeMaker (body: Global.Tree, matchPt: Global.Type) extends TreeMaker with NoNewBinders with Product with Serializable
    Definition Classes
    TreeMakers
  12. sealed abstract class CondTreeMaker extends FunTreeMaker
    Definition Classes
    TreeMakers
  13. case class EqualityTestTreeMaker (prevBinder: Global.Symbol, patTree: Global.Tree, pos: Global.Position) extends CondTreeMaker with Product with Serializable
    Definition Classes
    TreeMakers
  14. case class ExtractorTreeMaker (extractor: Global.Tree, extraCond: Option[Global.Tree], nextBinder: Global.Symbol)(subPatBinders: List[Global.Symbol], subPatRefs: List[Global.Tree], potentiallyMutableBinders: Set[Global.Symbol], extractorReturnsBoolean: Boolean, checkedLength: Option[Int], prevBinder: Global.Symbol, ignoredSubPatBinders: Set[Global.Symbol]) extends FunTreeMaker with PreserveSubPatBinders with Product with Serializable

    Make a TreeMaker that will result in an extractor call specified by extractor the next TreeMaker (here, we don't know which it'll be) is chained after this one by flatMap'ing a function with binder nextBinder over our extractor's result the function's body is determined by the next TreeMaker (furthermore, the interpretation of flatMap depends on the codegen instance we're using).

    Make a TreeMaker that will result in an extractor call specified by extractor the next TreeMaker (here, we don't know which it'll be) is chained after this one by flatMap'ing a function with binder nextBinder over our extractor's result the function's body is determined by the next TreeMaker (furthermore, the interpretation of flatMap depends on the codegen instance we're using).

    The values for the subpatterns, as computed by the extractor call in extractor, are stored in local variables that re-use the symbols in subPatBinders. This makes extractor patterns more debuggable (scala/bug#5739).

    Definition Classes
    TreeMakers
  15. sealed abstract class FunTreeMaker extends TreeMaker
    Definition Classes
    TreeMakers
  16. case class GuardTreeMaker (guardTree: Global.Tree) extends TreeMaker with NoNewBinders with Product with Serializable
    Definition Classes
    TreeMakers
  17. sealed trait NoNewBinders extends TreeMaker
    Definition Classes
    TreeMakers
  18. sealed trait PreserveSubPatBinders extends TreeMaker
    Definition Classes
    TreeMakers
  19. 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.

    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.

    Definition Classes
    TreeMakers
  20. case class SubstOnlyTreeMaker (prevBinder: Global.Symbol, nextBinder: Global.Symbol) extends TreeMaker with Product with Serializable
    Definition Classes
    TreeMakers
  21. abstract class TreeMaker extends AnyRef
    Definition Classes
    TreeMakers
  22. case class TrivialTreeMaker (tree: Global.Tree) extends TreeMaker with NoNewBinders with Product with Serializable
    Definition Classes
    TreeMakers
  23. case class TypeTestTreeMaker (prevBinder: Global.Symbol, testedBinder: Global.Symbol, expectedTp: Global.Type, nextBinderTp: Global.Type)(pos: Global.Position, extractorArgTypeTest: Boolean = false) extends CondTreeMaker with Product with Serializable

    implements the run-time aspects of (§8.2) (typedPattern has already done the necessary type transformations)

    implements the run-time aspects of (§8.2) (typedPattern has already done the necessary type transformations)

    Type patterns consist of types, type variables, and wildcards. A type pattern T is of one of the following forms:

    • A reference to a class C, p.C, or T#C. This type pattern matches any non-null instance of the given class. Note that the prefix of the class, if it is given, is relevant for determining class instances. For instance, the pattern p.C matches only instances of classes C which were created with the path p as prefix. The bottom types scala.Nothing and scala.Null cannot be used as type patterns, because they would match nothing in any case.
    • A singleton type p.type. This type pattern matches only the value denoted by the path p (that is, a pattern match involved a comparison of the matched value with p using method eq in class AnyRef). // TODO: the actual pattern matcher uses ==, so that's what I'm using for now // https://github.com/scala/bug/issues/4577 "pattern matcher, still disappointing us at equality time"
    • A compound type pattern T1 with ... with Tn where each Ti is a type pat- tern. This type pattern matches all values that are matched by each of the type patterns Ti.
    • A parameterized type pattern T[a1,...,an], where the ai are type variable patterns or wildcards _. This type pattern matches all values which match T for some arbitrary instantiation of the type variables and wildcards. The bounds or alias type of these type variable are determined as described in (§8.3).
    • A parameterized type pattern scala.Array[T1], where T1 is a type pattern. // TODO This type pattern matches any non-null instance of type scala.Array[U1], where U1 is a type matched by T1.
    Definition Classes
    TreeMakers

Value Members

  1. object EmptySubstitution extends Substitution
    Definition Classes
    TypedSubstitution
  2. object Substitution
    Definition Classes
    TypedSubstitution
  3. object pureCodegen extends CommonCodegen with Casegen
    Definition Classes
    PureCodegen
  4. object ExtractorCall
    Definition Classes
    MatchTranslator
  5. object PatternBoundToUnderscore
    Definition Classes
    MatchTranslator
  6. object SymbolBound
    Definition Classes
    MatchTranslator
  7. object WildcardPattern

    A conservative approximation of which patterns do not discern anything.

    A conservative approximation of which patterns do not discern anything. They are discarded during the translation.

    Definition Classes
    MatchTranslator
  8. object IrrefutableExtractorTreeMaker
    Definition Classes
    TreeMakers
  9. object TypeTestTreeMaker extends Serializable
    Definition Classes
    TreeMakers
  10. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  11. final def ##(): Int
    Definition Classes
    AnyRef → Any
  12. def +(other: String): String
    Implicit
    This member is added by an implicit conversion from PureMatchTranslator to any2stringadd[PureMatchTranslator] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  13. def ->[B](y: B): (PureMatchTranslator, B)
    Implicit
    This member is added by an implicit conversion from PureMatchTranslator to ArrowAssoc[PureMatchTranslator] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  14. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  15. def _match(n: Global.Name): SelectStart
    Definition Classes
    PureMatchMonadInterface
  16. def analyzeCases(prevBinder: Global.Symbol, cases: List[List[TreeMaker]], pt: Global.Type, suppression: PatternMatching.Suppression): Unit
    Definition Classes
    PureMatchTranslator → TreeMakers
  17. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  18. def checkMatchVariablePatterns(cases: List[Global.CaseDef]): Unit
    Definition Classes
    TreeMakerWarnings
  19. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  20. def codegen: AbsCodegen
    Definition Classes
    PureCodegen → CodegenCore
  21. def combineCases(scrut: Global.Tree, scrutSym: Global.Symbol, casesRaw: List[List[TreeMaker]], pt: Global.Type, owner: Global.Symbol, matchFailGenOverride: Option[(Global.Tree) ⇒ Global.Tree]): Global.Tree
    Definition Classes
    TreeMakers
  22. def combineCasesNoSubstOnly(scrut: Global.Tree, scrutSym: Global.Symbol, casesNoSubstOnly: List[List[TreeMaker]], pt: Global.Type, owner: Global.Symbol, matchFailGenOverride: Option[(Global.Tree) ⇒ Global.Tree]): Global.Tree
    Definition Classes
    TreeMakers
  23. def combineExtractors(treeMakers: List[TreeMaker])(casegen: Casegen): Global.Tree
    Definition Classes
    TreeMakers
  24. val debugInfoEmitVars: Boolean
    Attributes
    protected
    Definition Classes
    TreeMakers
  25. def emitSwitch(scrut: Global.Tree, scrutSym: Global.Symbol, cases: List[List[TreeMaker]], pt: Global.Type, matchFailGenOverride: Option[(Global.Tree) ⇒ Global.Tree], unchecked: Boolean): Option[Global.Tree]
    Definition Classes
    TreeMakers
  26. def emitTypeSwitch(bindersAndCases: List[(Global.Symbol, List[TreeMaker])], pt: Global.Type): Option[List[Global.CaseDef]]
    Definition Classes
    TreeMakers
  27. def ensuring(cond: (PureMatchTranslator) ⇒ Boolean, msg: ⇒ Any): PureMatchTranslator
    Implicit
    This member is added by an implicit conversion from PureMatchTranslator to Ensuring[PureMatchTranslator] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  28. def ensuring(cond: (PureMatchTranslator) ⇒ Boolean): PureMatchTranslator
    Implicit
    This member is added by an implicit conversion from PureMatchTranslator to Ensuring[PureMatchTranslator] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  29. def ensuring(cond: Boolean, msg: ⇒ Any): PureMatchTranslator
    Implicit
    This member is added by an implicit conversion from PureMatchTranslator to Ensuring[PureMatchTranslator] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  30. def ensuring(cond: Boolean): PureMatchTranslator
    Implicit
    This member is added by an implicit conversion from PureMatchTranslator to Ensuring[PureMatchTranslator] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  31. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  32. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  33. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  34. def fixerUpper(origOwner: Global.Symbol, pos: Global.Position): Global.Traverser
    Attributes
    protected
    Definition Classes
    TreeMakers
  35. def formatted(fmtstr: String): String
    Implicit
    This member is added by an implicit conversion from PureMatchTranslator to StringFormat[PureMatchTranslator] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  36. def freshName(prefix: String): Global.TermName
    Definition Classes
    CodegenCore
  37. def freshSym(pos: Global.Position, tp: Global.Type = NoType, prefix: String = "x"): Global.TermSymbol
    Definition Classes
    CodegenCore
  38. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
  39. def hashCode(): Int
    Definition Classes
    AnyRef → Any
  40. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  41. val matchOwner: Global.Symbol
    Definition Classes
    MatchMonadInterface
  42. val matchStrategy: Global.Tree
    Definition Classes
    PureMatchTranslator → PureMatchMonadInterface
  43. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  44. def newBoundTree(tree: Global.Tree, pt: Global.Type): BoundTree
    Definition Classes
    MatchTranslator
  45. def newSynthCaseLabel(name: String): Global.MethodSymbol
    Definition Classes
    CodegenCore
  46. final def notify(): Unit
    Definition Classes
    AnyRef
  47. final def notifyAll(): Unit
    Definition Classes
    AnyRef
  48. def optimizeCases(prevBinder: Global.Symbol, cases: List[List[TreeMaker]], pt: Global.Type): (List[List[TreeMaker]], collection.immutable.Nil.type)
    Definition Classes
    PureMatchTranslator → TreeMakers
  49. def propagateSubstitution(treeMakers: List[TreeMaker], initial: Substitution): List[TreeMaker]
    Definition Classes
    TreeMakers
  50. def pureType(tp: Global.Type): Global.Type
    Definition Classes
    PureMatchMonadInterface → MatchMonadInterface
  51. def removeSubstOnly(makers: List[TreeMaker]): collection.immutable.List[TreeMaker]
    Definition Classes
    TreeMakers
  52. def reportMissingCases(pos: Global.Position, counterExamples: List[String]): Unit
    Definition Classes
    MatchMonadInterface
  53. def reportUnreachable(pos: Global.Position): Unit
    Definition Classes
    MatchMonadInterface
  54. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  55. def toString(): String
    Definition Classes
    AnyRef → Any
  56. def translateBody(body: Global.Tree, matchPt: Global.Type): TreeMaker
    Definition Classes
    MatchTranslator
  57. def translateCase(scrutSym: Global.Symbol, pt: Global.Type)(caseDef: Global.CaseDef): collection.immutable.List[TreeMaker]

    The translation of pat if guard => body has two aspects: 1) the substitution due to the variables bound by patterns 2) the combination of the extractor calls using flatMap.

    The translation of pat if guard => body has two aspects: 1) the substitution due to the variables bound by patterns 2) the combination of the extractor calls using flatMap.

    2) is easy -- it looks like: translatePattern_1.flatMap(translatePattern_2....flatMap(translatePattern_N.flatMap(translateGuard.flatMap((x_i) => success(Xbody(x_i)))))...) this must be right-leaning tree, as can be seen intuitively by considering the scope of bound variables: variables bound by pat_1 must be visible from the function inside the left-most flatMap right up to Xbody all the way on the right 1) is tricky because translatePattern_i determines the shape of translatePattern_i+1: zoom in on translatePattern_1.flatMap(translatePattern_2) for example -- it actually looks more like: translatePattern_1(x_scrut).flatMap((x_1) => {y_i -> x_1._i}translatePattern_2)

    x_1 references the result (inside the monad) of the extractor corresponding to pat_1, this result holds the values for the constructor arguments, which translatePattern_1 has extracted from the object pointed to by x_scrut. The y_i are the symbols bound by pat_1 (in order) in the scope of the remainder of the pattern, and they must thus be replaced by:

    • (for 1-ary unapply) x_1
    • (for n-ary unapply, n > 1) selection of the i'th tuple component of x_1
    • (for unapplySeq) x_1.apply(i)

    in the treemakers,

    Thus, the result type of translatePattern_i's extractor must conform to M[(T_1,..., T_n)].

    Operationally, phase 1) is a foldLeft, since we must consider the depth-first-flattening of the transformed patterns from left to right. For every pattern ast node, it produces a transformed ast and a function that will take care of binding and substitution of the next ast (to the right).

    Definition Classes
    MatchTranslator
  58. def translateGuard(guard: Global.Tree): List[TreeMaker]
    Definition Classes
    MatchTranslator
  59. def translateMatch(match_: Global.Match): Global.Tree

    Implement a pattern match by turning its cases (including the implicit failure case) into the corresponding (monadic) extractors, and combining them with the orElse combinator.

    Implement a pattern match by turning its cases (including the implicit failure case) into the corresponding (monadic) extractors, and combining them with the orElse combinator.

    For scrutinee match { case1 ... caseN }, the resulting tree has the shape runOrElse(scrutinee)(x => translateCase1(x).orElse(translateCase2(x)).....orElse(zero))

    NOTE: the resulting tree is not type checked, nor are nested pattern matches transformed thus, you must typecheck the result (and that will in turn translate nested matches) this could probably optimized... (but note that the matchStrategy must be solved for each nested patternmatch)

    Definition Classes
    MatchTranslator
  60. def translatePattern(bound: BoundTree): List[TreeMaker]
    Definition Classes
    MatchTranslator
  61. def translateTry(caseDefs: List[Global.CaseDef], pt: Global.Type, pos: Global.Position): List[Global.CaseDef]
    Definition Classes
    MatchTranslator
  62. val typer: (analyzer)#Typer
    Definition Classes
    PureMatchTranslator → MatchMonadInterface
  63. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  64. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  65. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  66. def →[B](y: B): (PureMatchTranslator, B)
    Implicit
    This member is added by an implicit conversion from PureMatchTranslator to ArrowAssoc[PureMatchTranslator] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Inherited from PatternMatching.PureCodegen

Inherited from PatternMatching.PureMatchMonadInterface

Inherited from PatternMatching.MatchTranslator

Inherited from PatternMatching.TreeMakerWarnings

Inherited from PatternMatching.TreeMakers

Inherited from PatternMatching.CodegenCore

Inherited from PatternMatching.TypedSubstitution

Inherited from PatternMatching.MatchMonadInterface

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from PureMatchTranslator to any2stringadd[PureMatchTranslator]

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

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

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

Ungrouped