class PureMatchTranslator extends MatchTranslator with PureCodegen
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- PatternMatching.scala
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- PureCodegen
- PureMatchMonadInterface
- MatchTranslator
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Instance Constructors
- new PureMatchTranslator(typer: (analyzer)#Typer, matchStrategy: Global.Tree, selectorPos: Global.Position)
Type Members
-
class
Substitution extends AnyRef
- Definition Classes
- TypedSubstitution
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trait
AbsCodegen extends AnyRef
- Definition Classes
- CodegenCore
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trait
Casegen extends AbsCodegen
- Definition Classes
- CodegenCore
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abstract
class
CommonCodegen extends AbsCodegen
- Definition Classes
- CodegenCore
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final
case class
BoundTree(binder: Global.Symbol, tree: Global.Tree) extends Product with Serializable
- Definition Classes
- MatchTranslator
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abstract
class
ExtractorCall extends PatternMatching.ExtractorAlignment
- Definition Classes
- MatchTranslator
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class
ExtractorCallProd extends ExtractorCall
- Definition Classes
- MatchTranslator
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class
ExtractorCallRegular extends ExtractorCall
- Definition Classes
- MatchTranslator
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final
case class
TranslationStep(makers: List[MatchTranslator.TreeMaker], subpatterns: List[BoundTree]) extends Product with Serializable
- Definition Classes
- MatchTranslator
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case class
AlternativesTreeMaker(prevBinder: Global.Symbol, altss: List[List[TreeMaker]], pos: Global.Position) extends TreeMaker with NoNewBinders with Product with Serializable
- Definition Classes
- TreeMakers
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case class
BodyTreeMaker(body: Global.Tree, matchPt: Global.Type) extends TreeMaker with NoNewBinders with Product with Serializable
- Definition Classes
- TreeMakers
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sealed abstract
class
CondTreeMaker extends FunTreeMaker
- Definition Classes
- TreeMakers
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case class
EqualityTestTreeMaker(prevBinder: Global.Symbol, patTree: Global.Tree, pos: Global.Position) extends CondTreeMaker with Product with Serializable
- Definition Classes
- TreeMakers
-
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
extractorthe next TreeMaker (here, we don't know which it'll be) is chained after this one by flatMap'ing a function with bindernextBinderover our extractor's result the function's body is determined by the next TreeMaker (furthermore, the interpretation offlatMapdepends on the codegen instance we're using).Make a TreeMaker that will result in an extractor call specified by
extractorthe next TreeMaker (here, we don't know which it'll be) is chained after this one by flatMap'ing a function with bindernextBinderover our extractor's result the function's body is determined by the next TreeMaker (furthermore, the interpretation offlatMapdepends 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 insubPatBinders. This makes extractor patterns more debuggable (scala/bug#5739).- Definition Classes
- TreeMakers
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sealed abstract
class
FunTreeMaker extends TreeMaker
- Definition Classes
- TreeMakers
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case class
GuardTreeMaker(guardTree: Global.Tree) extends TreeMaker with NoNewBinders with Product with Serializable
- Definition Classes
- TreeMakers
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sealed
trait
NoNewBinders extends TreeMaker
- Definition Classes
- TreeMakers
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sealed
trait
PreserveSubPatBinders extends TreeMaker
- Definition Classes
- TreeMakers
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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 nodef unapplyordef 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 aredef unapply_I(x: T): U_Imethods, and the type of the I'th sub-pattern isU_I. The same exception for Seq patterns applies: if the last extractor is of typeSeq[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
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case class
SubstOnlyTreeMaker(prevBinder: Global.Symbol, nextBinder: Global.Symbol) extends TreeMaker with Product with Serializable
- Definition Classes
- TreeMakers
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abstract
class
TreeMaker extends AnyRef
- Definition Classes
- TreeMakers
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case class
TrivialTreeMaker(tree: Global.Tree) extends TreeMaker with NoNewBinders with Product with Serializable
- Definition Classes
- TreeMakers
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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
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object
EmptySubstitution extends Substitution
- Definition Classes
- TypedSubstitution
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object
Substitution
- Definition Classes
- TypedSubstitution
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object
pureCodegen extends CommonCodegen with Casegen
- Definition Classes
- PureCodegen
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object
ExtractorCall
- Definition Classes
- MatchTranslator
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object
PatternBoundToUnderscore
- Definition Classes
- MatchTranslator
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object
SymbolBound
- Definition Classes
- MatchTranslator
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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
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object
IrrefutableExtractorTreeMaker
- Definition Classes
- TreeMakers
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object
TypeTestTreeMaker extends Serializable
- Definition Classes
- TreeMakers
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final
def
!=(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
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final
def
##(): Int
- Definition Classes
- AnyRef → Any
-
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
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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()
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final
def
==(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
-
def
_match(n: Global.Name): SelectStart
- Definition Classes
- PureMatchMonadInterface
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def
analyzeCases(prevBinder: Global.Symbol, cases: List[List[TreeMaker]], pt: Global.Type, suppression: PatternMatching.Suppression): Unit
- Definition Classes
- PureMatchTranslator → TreeMakers
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final
def
asInstanceOf[T0]: T0
- Definition Classes
- Any
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def
checkMatchVariablePatterns(cases: List[Global.CaseDef]): Unit
- Definition Classes
- TreeMakerWarnings
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def
clone(): AnyRef
- Attributes
- protected[lang]
- Definition Classes
- AnyRef
- Annotations
- @throws( ... ) @native()
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def
codegen: AbsCodegen
- Definition Classes
- PureCodegen → CodegenCore
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def
combineCases(scrut: Global.Tree, scrutSym: Global.Symbol, casesRaw: List[List[TreeMaker]], pt: Global.Type, selectorPos: Global.Position, owner: Global.Symbol, matchFailGenOverride: Option[(Global.Tree) ⇒ Global.Tree]): Global.Tree
- Definition Classes
- TreeMakers
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def
combineCasesNoSubstOnly(scrut: Global.Tree, scrutSym: Global.Symbol, casesNoSubstOnly: List[List[TreeMaker]], pt: Global.Type, selectorPos: Global.Position, owner: Global.Symbol, matchFailGenOverride: Option[(Global.Tree) ⇒ Global.Tree]): Global.Tree
- Definition Classes
- TreeMakers
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def
combineExtractors(treeMakers: List[TreeMaker])(casegen: Casegen): Global.Tree
- Definition Classes
- TreeMakers
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val
debugInfoEmitVars: Boolean
- Attributes
- protected
- Definition Classes
- TreeMakers
-
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
-
def
emitTypeSwitch(bindersAndCases: List[(Global.Symbol, List[TreeMaker])], pt: Global.Type): Option[List[Global.CaseDef]]
- Definition Classes
- TreeMakers
-
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
-
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
-
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
-
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
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final
def
eq(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
-
def
equals(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
-
def
finalize(): Unit
- Attributes
- protected[lang]
- Definition Classes
- AnyRef
- Annotations
- @throws( classOf[java.lang.Throwable] )
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def
fixerUpper(origOwner: Global.Symbol, pos: Global.Position): Global.Traverser
- Attributes
- protected
- Definition Classes
- TreeMakers
-
def
freshName(prefix: String): Global.TermName
- Definition Classes
- CodegenCore
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def
freshSym(pos: Global.Position, tp: Global.Type = NoType, prefix: String = "x"): Global.TermSymbol
- Definition Classes
- CodegenCore
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final
def
getClass(): Class[_]
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
-
def
hashCode(): Int
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
-
final
def
isInstanceOf[T0]: Boolean
- Definition Classes
- Any
-
val
matchOwner: Global.Symbol
- Definition Classes
- MatchMonadInterface
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val
matchStrategy: Global.Tree
- Definition Classes
- PureMatchTranslator → PureMatchMonadInterface
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final
def
ne(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
-
def
newSynthCaseLabel(name: String): Global.MethodSymbol
- Definition Classes
- CodegenCore
-
final
def
notify(): Unit
- Definition Classes
- AnyRef
- Annotations
- @native()
-
final
def
notifyAll(): Unit
- Definition Classes
- AnyRef
- Annotations
- @native()
-
def
optimizeCases(prevBinder: Global.Symbol, cases: List[List[TreeMaker]], pt: Global.Type, selectorPos: Global.Position): (List[List[TreeMaker]], collection.immutable.Nil.type)
- Definition Classes
- PureMatchTranslator → TreeMakers
-
def
propagateSubstitution(treeMakers: List[TreeMaker], initial: Substitution): List[TreeMaker]
- Definition Classes
- TreeMakers
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def
pureType(tp: Global.Type): Global.Type
- Definition Classes
- PureMatchMonadInterface → MatchMonadInterface
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def
removeSubstOnly(makers: List[TreeMaker]): collection.immutable.List[TreeMaker]
- Definition Classes
- TreeMakers
-
def
reportMissingCases(pos: Global.Position, counterExamples: List[String]): Unit
- Definition Classes
- MatchMonadInterface
-
def
reportUnreachable(pos: Global.Position): Unit
- Definition Classes
- MatchMonadInterface
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val
selectorPos: Global.Position
- Definition Classes
- PureMatchTranslator → MatchTranslator
-
final
def
synchronized[T0](arg0: ⇒ T0): T0
- Definition Classes
- AnyRef
-
def
toString(): String
- Definition Classes
- AnyRef → Any
-
def
translateBody(body: Global.Tree, matchPt: Global.Type): TreeMaker
- Definition Classes
- MatchTranslator
-
def
translateCase(scrutSym: Global.Symbol, pt: Global.Type)(caseDef: Global.CaseDef): collection.immutable.List[TreeMaker]
The translation of
pat if guard => bodyhas two aspects: 1) the substitution due to the variables bound by patterns 2) the combination of the extractor calls usingflatMap.The translation of
pat if guard => bodyhas two aspects: 1) the substitution due to the variables bound by patterns 2) the combination of the extractor calls usingflatMap.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 ontranslatePattern_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_1references the result (inside the monad) of the extractor corresponding topat_1, this result holds the values for the constructor arguments, which translatePattern_1 has extracted from the object pointed to byx_scrut. They_iare the symbols bound bypat_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 toM[(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
-
def
translateGuard(guard: Global.Tree): List[TreeMaker]
- Definition Classes
- MatchTranslator
-
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
orElsecombinator.Implement a pattern match by turning its cases (including the implicit failure case) into the corresponding (monadic) extractors, and combining them with the
orElsecombinator.For
scrutinee match { case1 ... caseN }, the resulting tree has the shaperunOrElse(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
-
def
translatePattern(bound: BoundTree): List[TreeMaker]
- Definition Classes
- MatchTranslator
-
def
translateTry(caseDefs: List[Global.CaseDef], pt: Global.Type, pos: Global.Position): List[Global.CaseDef]
- Definition Classes
- MatchTranslator
-
val
typer: (analyzer)#Typer
- Definition Classes
- PureMatchTranslator → MatchMonadInterface
-
final
def
wait(): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
-
final
def
wait(arg0: Long, arg1: Int): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
-
final
def
wait(arg0: Long): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... ) @native()
-
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
Deprecated Value Members
-
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
- @deprecated @inline()
- Deprecated
(Since version 2.12.16) Use
formatString.format(value)instead ofvalue.formatted(formatString), or use thef""string interpolator. In Java 15 and later,formattedresolves to the new method in String which has reversed parameters.
The Scala compiler and reflection APIs.