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Java Source Code / Java Documentation » Parser » runcc » fri.patterns.interpreter.parsergenerator.parsertables

Source Cross Reference

Class Diagram

Java Document (Java Doc)

fri.util.collections .UniqueAggregatingHashtable

fri.patterns.interpreter.parsergenerator.parsertables .FollowSets

FollowSets

class FollowSets extends UniqueAggregatingHashtable (Code)

Map of all FOLLOW-sets of a SLR syntax. Key is nonterminal.

The FOLLOW-set for a nonterminal is the collection of terminals that can appear behind that nonterminal on the right side of all rules.

Algorithm:
Search all rules that contain the nonterminal on right side. Scan for a terminal after the nonterminal on right side until found or one scanned nonterminal is not nullable. The FIRST set of every scanned nonterminal goes to the FOLLOW set. When reaching the end without having found a terminal or a non-nullable nonterminal, even the FOLLOW set of the nonterminal on the left side of that rule goes to FOLLOW.
author:
(c) 2000, Fritz Ritzberger

Constructor Summary
public	FollowSets(Syntax syntax, Nullable nullAble, FirstSets firstSets) Calculate FOLLOW-sets for all nonterminals contained in passed syntax.

Method Summary
public static void	main(String[] args)
public Object	put(Object key, Object value) Overridden to check for equality of key and value: Exception is thrown when so.

Constructor Detail

FollowSets
public FollowSets(Syntax syntax, Nullable nullAble, FirstSets firstSets) throws ParserBuildException(Code)
	Calculate FOLLOW-sets for all nonterminals contained in passed syntax. The FOLLOW sets will then be Lists within a Map that provides the nonterminal as key. Parameters: syntax - the grammar Parameters: nullAble - Map containing Boolean true when nonterminal (key) is nullable, else false. Parameters: firstSets - ready-made FIRST sets for all nonterminals.

Method Detail

main
public static void main(String[] args)(Code)
	Test main

put
public Object put(Object key, Object value)(Code)
	Overridden to check for equality of key and value: Exception is thrown when so.

Methods inherited from fri.util.collections.UniqueAggregatingHashtable

protected boolean shouldAdd(List list, Object value)(Code)(Java Doc)

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