org.kiama.attribution.AttributionBase

CircularAttribute

abstract class CircularAttribute[T <: AnyRef, U] extends Attribute[T, U]

An attribute of a node type T with value of type U which has a circular definition. The value of the attribute is computed by the function f which may itself use the value of the attribute. init specifies an initial value for the attribute. The attribute (and any circular attributes on which it depends) are evaluated until no value changes (i.e., a fixed point is reached). The final result is memoised so that subsequent evaluations return the same value.

This code implements the basic circular evaluation algorithm from "Circular Reference Attributed Grammars - their Evaluation and Applications", by Magnusson and Hedin from LDTA 2003.

Source
Attribution.scala
Linear Supertypes
Attribute[T, U], (T) ⇒ U, AnyRef, Any
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Inherited
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  1. CircularAttribute
  2. Attribute
  3. Function1
  4. AnyRef
  5. Any
Visibility
  1. Public
  2. All

Instance Constructors

  1. new CircularAttribute(init: U, f: (T) ⇒ U)

Abstract Value Members

  1. abstract def optName: Option[String]

    An optional name, used in debugging output if present.

    An optional name, used in debugging output if present.

    Definition Classes
    Attribute

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

    Definition Classes
    AnyRef

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

    Definition Classes
    Any

  6. def andThen[A](g: (U) ⇒ A): (T) ⇒ A

    Definition Classes
    Function1

  7. def apply(t: T): U

    Return the value of this attribute for node t.

    Return the value of this attribute for node t. Essentially Figure 6 from the CRAG paper.

    Definition Classes
    CircularAttribute → Function1

  8. final def asInstanceOf[T0]: T0

    Definition Classes
    Any

  9. def clone(): AnyRef

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

  10. def compose[A](g: (A) ⇒ T): (A) ⇒ U

    Definition Classes
    Function1

  11. final def eq(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  12. def equals(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  13. def finalize(): Unit

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

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

    Definition Classes
    AnyRef → Any

  15. def hashCode(): Int

    Definition Classes
    AnyRef → Any

  16. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any

  17. final def ne(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  18. final def notify(): Unit

    Definition Classes
    AnyRef

  19. final def notifyAll(): Unit

    Definition Classes
    AnyRef

  20. def reportCycle(t: T): U

    Report a cycle in the calculation of this attribute discovered when evaluating the attribute on value t.

    Report a cycle in the calculation of this attribute discovered when evaluating the attribute on value t. Throws an IllegalStateException.

    Definition Classes
    Attribute

  21. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef

  22. def toString(): String

    Definition Classes
    Function1 → AnyRef → Any

  23. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws()

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

    Definition Classes
    AnyRef
    Annotations
    @throws()

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

    Definition Classes
    AnyRef
    Annotations
    @throws()

Inherited from Attribute[T, U]

Inherited from (T) ⇒ U

Inherited from AnyRef

Inherited from Any