xtc.parser
Class DuplicateProductionFolder

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

public class DuplicateProductionFolder
extends GrammarVisitor

Visitor to fold duplicate productions into a single production.

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

Version:

$Revision: 1.36 $

Author:

Robert Grimm

Field Summary

protected java.util.Map<NonTerminal,NonTerminal>

folded The map of from folded nonterminals to replacement nonterminals.

Fields inherited from class xtc.parser.GrammarVisitor

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

Constructor Summary

DuplicateProductionFolder(Runtime runtime, Analyzer analyzer)
Create a new duplicate production folder.

Method Summary

java.lang.Object	visit(Module m) Visit the specified grammar.
Element	visit(NonTerminal nt) Visit the specified nonterminal.

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

Field Detail

folded

protected final java.util.Map<NonTerminal,NonTerminal> folded

The map of from folded nonterminals to replacement nonterminals.

Constructor Detail

DuplicateProductionFolder

public DuplicateProductionFolder(Runtime runtime,
                                 Analyzer analyzer)

Create a new duplicate production folder.

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

visit

public Element visit(NonTerminal nt)

Visit the specified nonterminal.