xtc.parser
Class TransientMarker

java.lang.Object
  xtc.tree.Visitor
      xtc.parser.GrammarVisitor
          xtc.parser.TransientMarker

public class TransientMarker
extends GrammarVisitor

Visitor to detect productions that can be treated as transient.

Note that this visitor requires that a grammar's productions have been reference counted. Further note that this visitor assumes that the entire grammar is contained in a single module.

Version:

$Revision: 1.22 $

Author:

Robert Grimm

Field Summary

Fields inherited from class xtc.parser.GrammarVisitor

analyzer, isBound, isLastElement, isPredicate, isRepeatedOnce, isTopLevel, isVoided, needsSequence, runtime, transformInPlace

Constructor Summary

TransientMarker(Runtime runtime, Analyzer analyzer)
Create a new transient marker.

Method Summary

java.lang.Object

visit(Module m) Visit the specified grammar.

Methods inherited from class xtc.parser.GrammarVisitor

visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class xtc.tree.Visitor

dispatch, equals, hashCode, iterate, map, mapInPlace, unableToVisit, visit

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TransientMarker

public TransientMarker(Runtime runtime,
                       Analyzer analyzer)

Create a new transient marker.

Parameters:

runtime - The runtime.

analyzer - The analyzer utility.

Method Detail

visit

public java.lang.Object visit(Module m)

Visit the specified grammar.

Overrides:

visit in class GrammarVisitor

Parameters:

m - The grammar module.

Returns:

Boolean.TRUE if the grammar has been modified, otherwise Boolean.FALSE.