scala.util.parsing.ast

Binders

trait Binders extends AbstractSyntax with Mappable

This component provides functionality for enforcing variable binding during parse-time.

When parsing simple languages, like Featherweight Scala, these parser combinators will fully enforce the binding discipline. When names are allowed to be left unqualified, these mechanisms would have to be complemented by an extra phase that resolves names that couldn't be resolved using the naive binding rules. (Maybe some machinery to model implicit' binders (e.g., this' and imported qualifiers) and selection on a binder will suffice?)

Source
Binders.scala
Linear Supertypes
Mappable, AbstractSyntax, AnyRef, Any
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  1. Binders
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Type Members

  1. class BinderEnv extends AnyRef

    An environment that maps a NameElement' to the scope in which it is bound. This can be used to model scoping during parsing. (This class is similar to Burak's ECOOP paper on pattern matching, except that we use ==' instead of eq', thus types can't be unified in general) TODO: more documentation

  2. trait BindingSensitive extends AnyRef

  3. case class BoundElement [boundElement <: NameElement] (el: boundElement, scope: Scope[boundElement]) extends NameElement with Proxy with BindingSensitive with Product with Serializable

    A BoundElement' is bound in a certain scope scope', which keeps track of the actual element that el' stands for. A BoundElement' is represented textually by its bound element, followed by its scope's id'. For example: x@1' represents the variable x' that is bound in the scope with id' 1'.

  4. trait Element extends Positional

    The base class for elements of the abstract syntax tree.

  5. trait Mappable [T] extends AnyRef

  6. trait Mapper extends AnyRef

  7. trait NameElement extends Element

    The base class for elements in the AST that represent names {@see Binders}.

  8. trait ReturnAndDo [T] extends AnyRef

    Returns a given result, but executes the supplied closure before returning.

  9. class Scope [binderType <: NameElement] extends Iterable[binderType]

    A Scope' keeps track of one or more syntactic elements that represent bound names. The elements it contains share the same scope and must all be distinct (wrt. ==) A NameElement' n' in the AST that is conceptually bound by a Scope' s', is replaced by a BoundElement(n, s)'.

  10. class UnboundElement [N <: NameElement] extends NameElement

    A variable that escaped its scope (i.

  11. class UnderBinder [binderType <: NameElement, elementT] extends Element with BindingSensitive

    Represents an element with variables that are bound in a certain scope.

Abstract Value Members

  1. def UserNameElementIsMappable [t <: NameElement] (self: t): Mappable[t]

    Attributes
    abstract

Concrete Value Members

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

    Attributes
    final
    Definition Classes
    AnyRef

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

    Test two objects for inequality.

    Test two objects for inequality.

    returns

    true if !(this == that), false otherwise.

    Attributes
    final
    Definition Classes
    Any

  3. def ## (): Int

    Equivalent to x.hashCode except for boxed numeric types.

    Equivalent to x.hashCode except for boxed numeric types. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them.

    returns

    a hash value consistent with ==

    Attributes
    final
    Definition Classes
    AnyRef → Any

  4. def == (arg0: AnyRef): Boolean

    Attributes
    final
    Definition Classes
    AnyRef

  5. def == (arg0: Any): Boolean

    Test two objects for equality.

    Test two objects for equality.

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Attributes
    final
    Definition Classes
    Any

  6. object EmptyBinderEnv extends BinderEnv

  7. implicit def ListIsMappable [t] (xs: List[t])(implicit arg0: (t) ⇒ Mappable[t]): Mappable[List[t]]

    Attributes
    implicit
    Definition Classes
    Mappable

  8. implicit def NameElementIsMappable (self: NameElement): Mappable[NameElement]

    Attributes
    implicit

  9. implicit def OptionIsMappable [t] (xs: Option[t])(implicit arg0: (t) ⇒ Mappable[t]): Mappable[Option[t]]

    Attributes
    implicit
    Definition Classes
    Mappable

  10. implicit def ScopeIsMappable [bt <: NameElement] (scope: Scope[bt])(implicit arg0: (bt) ⇒ Mappable[bt]): Mappable[Scope[bt]]

    Attributes
    implicit

  11. implicit def StringIsMappable (s: String): Mappable[String]

    Attributes
    implicit
    Definition Classes
    Mappable

  12. object UnderBinder extends AnyRef

  13. implicit def UnderBinderIsMappable [bt <: NameElement, st] (ub: UnderBinder[bt, st])(implicit arg0: (bt) ⇒ Mappable[bt], arg1: (st) ⇒ Mappable[st]): Mappable[UnderBinder[bt, st]]

    Attributes
    implicit

  14. def asInstanceOf [T0] : T0

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

    the receiver object.

    Attributes
    final
    Definition Classes
    Any

  15. def clone (): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

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

  16. def eq (arg0: AnyRef): Boolean

    Tests whether the argument (arg0) is a reference to the receiver object (this).

    Tests whether the argument (arg0) is a reference to the receiver object (this).

    The eq method implements an equivalence relation on non-null instances of AnyRef, and has three additional properties:

    • It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
    • For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
    • null.eq(null) returns true.

    When overriding the equals or hashCode methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).

    returns

    true if the argument is a reference to the receiver object; false otherwise.

    Attributes
    final
    Definition Classes
    AnyRef

  17. def equals (arg0: Any): Boolean

    The equality method for reference types.

    The equality method for reference types. See equals in Any.

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    AnyRef → Any

  18. def finalize (): Unit

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the finalize method is invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent.

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

  19. def getClass (): java.lang.Class[_]

    A representation that corresponds to the dynamic class of the receiver object.

    A representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

    a representation that corresponds to the dynamic class of the receiver object.

    Attributes
    final
    Definition Classes
    AnyRef → Any

  20. def hashCode (): Int

    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in Any.

    returns

    the hash code value for this object.

    Definition Classes
    AnyRef → Any

  21. def isInstanceOf [T0] : Boolean

    Test whether the dynamic type of the receiver object is T0.

    Test whether the dynamic type of the receiver object is T0.

    Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression 1.isInstanceOf[String] will return false, while the expression List(1).isInstanceOf[List[String]] will return true. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

    returns

    true if the receiver object is an instance of erasure of type T0; false otherwise.

    Attributes
    final
    Definition Classes
    Any

  22. def ne (arg0: AnyRef): Boolean

    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

    true if the argument is not a reference to the receiver object; false otherwise.

    Attributes
    final
    Definition Classes
    AnyRef

  23. def notify (): Unit

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Attributes
    final
    Definition Classes
    AnyRef

  24. def notifyAll (): Unit

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Attributes
    final
    Definition Classes
    AnyRef

  25. def return_ [T] (result: T): ReturnAndDo[T]

  26. def sequence [bt <: NameElement, st] (orig: List[UnderBinder[bt, st]])(implicit arg0: (st) ⇒ Mappable[st]): UnderBinder[bt, List[st]]

    If a list of UnderBinder's all have the same scope, they can be turned in to an UnderBinder containing a list of the elements in the original UnderBinder'.

    If a list of UnderBinder's all have the same scope, they can be turned in to an UnderBinder containing a list of the elements in the original UnderBinder'.

    The name sequence' comes from the fact that this method's type is equal to the type of monadic sequence.

  27. def synchronized [T0] (arg0: ⇒ T0): T0

    Attributes
    final
    Definition Classes
    AnyRef

  28. def toString (): String

    Creates a String representation of this object.

    Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

    returns

    a String representation of the object.

    Definition Classes
    AnyRef → Any

  29. def unsequence [bt <: NameElement, st] (orig: UnderBinder[bt, List[st]])(implicit arg0: (st) ⇒ Mappable[st]): List[UnderBinder[bt, st]]

  30. def wait (): Unit

    Attributes
    final
    Definition Classes
    AnyRef
    Annotations
    @throws()

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

    Attributes
    final
    Definition Classes
    AnyRef
    Annotations
    @throws()

  32. def wait (arg0: Long): Unit

    Attributes
    final
    Definition Classes
    AnyRef
    Annotations
    @throws()