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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  voidmain(String[] args)
    
public  Objectput(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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