net.sourceforge.chaperon.build
Class FirstSetCollection

java.lang.Object
  net.sourceforge.chaperon.build.FirstSetCollection

public class FirstSetCollection

extends java.lang.Object

This class creates a collection of FIRST sets.

Version:

CVS $Id: FirstSetCollection.java,v 1.12 2004/01/18 01:36:29 benedikta Exp $

Author:

Stephan Michels

Constructor Summary

FirstSetCollection(Grammar grammar)
Create a collection of FIRST sets.

FirstSetCollection(Grammar grammar, org.apache.commons.logging.Log log)
Create a collection of FIRST sets

Method Summary

SymbolSet	getFirstSet(Symbol symbol) Returns the FIRST set for a symbol.
SymbolSet	getFirstSet(SymbolList symbols) Returns the FIRST set for a sequence of symbols.
boolean	isNullable(Symbol symbol)
java.lang.String	toString() Return a string representation of the FIRST sets.

Methods inherited from class java.lang.Object

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

Constructor Detail

FirstSetCollection

public FirstSetCollection(Grammar grammar)

Create a collection of FIRST sets.

Parameters:

grammar - Grammar.

FirstSetCollection

public FirstSetCollection(Grammar grammar,
                          org.apache.commons.logging.Log log)

Create a collection of FIRST sets

Parameters:

grammar - Grammar

log - Log, whch should be used.

Method Detail

getFirstSet

public SymbolSet getFirstSet(Symbol symbol)

Returns the FIRST set for a symbol.

Parameters:

symbol - Symbol.

Returns:

Set of symbols.

getFirstSet

public SymbolSet getFirstSet(SymbolList symbols)

Returns the FIRST set for a sequence of symbols.

Returns:

Set of symbols.

isNullable

public boolean isNullable(Symbol symbol)

toString

public java.lang.String toString()

Return a string representation of the FIRST sets.

Returns:

String representation of the FIRST sets.