Packages

  • package root
    Definition Classes
    root
  • package io
    Definition Classes
    root
  • package dylemma
    Definition Classes
    io
  • package spac

    SPaC (short for "Streaming Parser Combinators") is a library for building stream consumers in a declarative style, specialized for tree-like data types like XML and JSON.

    SPaC (short for "Streaming Parser Combinators") is a library for building stream consumers in a declarative style, specialized for tree-like data types like XML and JSON.

    Many utilities for handling XML and JSON data involve parsing the entire "document" to some DOM model, then inspecting and transforming that model to extract information. The downside to these utilities is that when the document is very large, the DOM may not fit in memory. The workaround for this type of problem is to treat the document as a stream of "events", e.g. "StartElement" and "EndElement" for XML, or "StartObject" and "EndObject" for JSON. The downside to this workaround is that writing code to handle these streams can be complicated and error-prone, especially when the DOM is complicated.

    SPaC's goal is to drastically simplify the process of creating code to handle these streams.

    This package contains the "core" SPaC traits; Parser, Transformer, Splitter, and ContextMatcher.

    See the xml and json subpackages (provided by the xml-spac and json-spac libraries respectively) for specific utilities related to handling XML and JSON event streams.

    Definition Classes
    dylemma
  • object Transformer

    Definition Classes
    spac
  • BoundHandler
  • Handler
  • HandlerLinkage
  • HandlerWrite
  • Stateless
  • TransformerKVParsingOps
  • TransformerParsingOps

trait Handler[-In, +Out] extends AnyRef

An internally-mutable "handler" that performs a Transformer's input/output logic.

Source
Transformer.scala
Linear Supertypes
AnyRef, Any
Known Subclasses
Stateless
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Inherited
  1. Handler
  2. AnyRef
  3. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
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Visibility
  1. Public
  2. All

Abstract Value Members

  1. abstract def finish(out: HandlerWrite[Out]): Unit

    In response to the end of the stream of incoming values, this handler may output any number of final output values via the provided HandlerWrite.

    In response to the end of the stream of incoming values, this handler may output any number of final output values via the provided HandlerWrite. The expectation is that a Handler's finish method will only ever be called once before that Handler is discarded, with the exception of Stateless Transformers, which act as their own Handlers and will be reused.

    out

    The downstream receiver of output values

  2. abstract def push(in: In, out: HandlerWrite[Out]): Signal

    In response to some input value in, this handler may output any number of output values via the provided HandlerWrite, possibly change its internal state, and signal to the upstream caller whether it wants to continue or stop receiving new inputs.

    In response to some input value in, this handler may output any number of output values via the provided HandlerWrite, possibly change its internal state, and signal to the upstream caller whether it wants to continue or stop receiving new inputs. Upstream handlers SHOULD avoid making more calls to this handler's push after it returns Signal.Stop.

    in

    An input value

    out

    The downstream receiver of output values

    returns

    A "signal" indicating whether this handler wants to continue receiving inputs afterward

Concrete 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 Handler[In, Out] toany2stringadd[Handler[In, Out]] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. def ->[B](y: B): (Handler[In, Out], B)
    Implicit
    This member is added by an implicit conversion from Handler[In, Out] toArrowAssoc[Handler[In, Out]] 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 asTopLevelHandler(caller: SpacTraceElement): Handler[In, Out]

    Wraps this handler as a "top level" handler, which will inject a SpacTraceElement (representing the current input or the "EOF" signal) to any exception is thrown by this handler when calling its step or finish methods.

    Wraps this handler as a "top level" handler, which will inject a SpacTraceElement (representing the current input or the "EOF" signal) to any exception is thrown by this handler when calling its step or finish methods.

    Used internally by Transformers transform and toPipe methods.

  8. def bubbleUp(err: Throwable): Nothing

    In response to an error thrown and caught from a downstream consumer, this handler may modify the exception on its way back upstream.

    In response to an error thrown and caught from a downstream consumer, this handler may modify the exception on its way back upstream. Used by the "spac frame" transformer.

    err

    An error thrown by some downstream handler

    returns

    Nothing, because this method must always throw *something*

  9. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  10. def ensuring(cond: (Handler[In, Out]) => Boolean, msg: => Any): Handler[In, Out]
    Implicit
    This member is added by an implicit conversion from Handler[In, Out] toEnsuring[Handler[In, Out]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  11. def ensuring(cond: (Handler[In, Out]) => Boolean): Handler[In, Out]
    Implicit
    This member is added by an implicit conversion from Handler[In, Out] toEnsuring[Handler[In, Out]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  12. def ensuring(cond: Boolean, msg: => Any): Handler[In, Out]
    Implicit
    This member is added by an implicit conversion from Handler[In, Out] toEnsuring[Handler[In, Out]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  13. def ensuring(cond: Boolean): Handler[In, Out]
    Implicit
    This member is added by an implicit conversion from Handler[In, Out] toEnsuring[Handler[In, Out]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  14. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  15. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  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 Handler[In, Out] toStringFormat[Handler[In, Out]] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  18. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  19. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  20. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  21. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  22. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  23. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  24. def pushMany(ins: Iterator[In], out: HandlerWrite[Out]): Signal

    Convenience for calling push multiple times, aborting early if the signal becomes Stop in response to any one push.

    Convenience for calling push multiple times, aborting early if the signal becomes Stop in response to any one push.

    ins

    An iterator which produces input values to push into this handler

    out

    The downstream receiver of output values

    returns

    A "signal" indicating whether this handler wants to continue receiving inputs afterward

  25. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  26. def toString(): String
    Definition Classes
    AnyRef → Any
  27. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  28. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  29. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()

Deprecated Value Members

  1. def →[B](y: B): (Handler[In, Out], B)
    Implicit
    This member is added by an implicit conversion from Handler[In, Out] toArrowAssoc[Handler[In, Out]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use -> instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd fromHandler[In, Out] to any2stringadd[Handler[In, Out]]

Inherited by implicit conversion StringFormat fromHandler[In, Out] to StringFormat[Handler[In, Out]]

Inherited by implicit conversion Ensuring fromHandler[In, Out] to Ensuring[Handler[In, Out]]

Inherited by implicit conversion ArrowAssoc fromHandler[In, Out] to ArrowAssoc[Handler[In, Out]]

Ungrouped