[antlr-interest] Remove left recursion function

[Terence Parr]

Which version of AW?
Ter
On Sep 28, 2008, at 10:31 AM, Markus Stoeger wrote:

> Hello,
>
> I tried to use the "Refactor" -> "Remove left recursion" function but
> couldn't get it to work. When generating the parser ANTLR detects the
> left recursion. But when I place the cursor on the offending symbol  
> and
> try to start the "Remove left recursion" function it says "The rule
> doesn't have a left recursion.".
>
> Also ANTLR spits out the following exception in the console whenever  
> it
> detects a left recursion while generating a grammar:
>
> java.lang.ClassCastException: org.antlr.tool.Rule cannot be cast to
> java.lang.String
>    at
> org 
> .antlr 
> .works 
> .grammar.antlr.ANTLRGrammarEngineImpl.markLeftRecursiveRules(Unknown
> Source)
>    at
> org.antlr.works.grammar.antlr.ANTLRGrammarEngineImpl.analyze(Unknown  
> Source)
>    at org.antlr.works.grammar.engine.GrammarEngineImpl.analyze(Unknown
> Source)
>    at org.antlr.works.grammar.CheckGrammar.run(Unknown Source)
>    at java.lang.Thread.run(Unknown Source)
>
> I'm not sure if this has anything to do with the "Remove left  
> recursion"
> function not working.
>
> These problems seem to happen with every grammar that has a left  
> recursion.
>
> Max
>
>
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