xtc.parser
Class GenericVoider

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

public class GenericVoider
extends GrammarVisitor

Visitor to turn generic productions into void productions. Note that this visitor also voids productions that have Node or GNode as their types.

This visitor assumes that the entire grammar is contained in a single module.

Version:

$Revision: 1.11 $

Author:

Robert Grimm

Field Summary

Fields inherited from class xtc.parser.GrammarVisitor

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

Constructor Summary

GenericVoider(Runtime runtime, Analyzer analyzer)
Create a new generic voider.

Method Summary

protected Element	check(UnaryOperator op) Check the specified binding or string match.
Element	visit(Binding b) Visit the specified binding.
java.lang.Object	visit(Module m) Visit the specified grammar.
Element	visit(StringMatch m) Visit the specified string match.

Methods inherited from class xtc.parser.GrammarVisitor

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

GenericVoider

public GenericVoider(Runtime runtime,
                     Analyzer analyzer)

Create a new generic voider.

Parameters:

runtime - The runtime.

analyzer - The analyzer utility.

Method Detail

check

protected Element check(UnaryOperator op)

Check the specified binding or string match. If the bound or matched element has been voided by this visitor, this method reports an error. However, bindings to yyValue in voided productions are eliminated.

Parameters:

op - The binding or string match.

Returns:

The checked element.

visit

public java.lang.Object visit(Module m)

Visit the specified grammar.

Overrides:

visit in class GrammarVisitor

visit

public Element visit(Binding b)

Visit the specified binding.

Overrides:

visit in class GrammarVisitor

visit

public Element visit(StringMatch m)

Visit the specified string match.

Overrides:

visit in class GrammarVisitor