danbikel.parser.lang
Class AbstractHeadFinder.HeadFindInstruction

java.lang.Object
  danbikel.parser.lang.AbstractHeadFinder.HeadFindInstruction

All Implemented Interfaces:

Serializable

Enclosing class:

AbstractHeadFinder

protected static final class AbstractHeadFinder.HeadFindInstruction
extends Object
implements Serializable

Data structure for specifying a way to search for a head in a grammar production: a set of symbols to scan for and the direction of that scan.

See Also:

Serialized Form

Field Summary

protected boolean	direction The direction in which to scan: a value equal to Constants.LEFT indicates a left-to-right scan, and a value equal to Constants.RIGHT indicates a right-to-left scan.
protected Symbol[]	scanSet The set of symbols to scan for.

Constructor Summary

protected

AbstractHeadFinder.HeadFindInstruction(boolean direction, Symbol[] scanSet) Constructs a new HeadFindInstruction object.

Method Summary

String

toString() Converts this object to a human-readable string representation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

scanSet

protected Symbol[] scanSet

The set of symbols to scan for.

direction

protected boolean direction

The direction in which to scan: a value equal to Constants.LEFT indicates a left-to-right scan, and a value equal to Constants.RIGHT indicates a right-to-left scan.

Constructor Detail

AbstractHeadFinder.HeadFindInstruction

protected AbstractHeadFinder.HeadFindInstruction(boolean direction,
                                                 Symbol[] scanSet)

Constructs a new HeadFindInstruction object.

Parameters:

direction - the direction in which to scan: a value equal to Constants.LEFT indicates a left-to-right scan, and a value equal to Constants.RIGHT indicates a right-to-left scan

scanSet - the set of symbols to scan for

Method Detail

toString

public String toString()

Converts this object to a human-readable string representation.

Overrides:

toString in class Object

Returns:

a human-readable string representation of this object