[antlr-interest] Cannot display rule "X" because start state is not found

[Michael Pinnegar]

Jim Idle wrote:
>> rules, I get "Cannot display rule "X" because start state is not found"
>>
>> comment
>> 	: !(DIGIT | LETTER | SPACE)*
>> 	;
> 
> Remove the ! from this rule. Looks like you are trying to type a v2 grammar into AntlrWorks, which is for v3 grammars, which is probably what you should be using for a new project :-)

Actually the ! sign was just suppose to be the markup for a comment in the language. I guess it's 
also an operator for ANTLR's grammar processor like * or ; I encapsulated it in a set of 's and that 
fixed everything.

> 
>> SPACE
>> options {
>> 	paraphrase = " ";
>> }
> 
> Paraphrase option is for v2, not v3, so remove that options{} clause.

I ran the debugger some yesterday and it was complaining about this, so I did that. I think I found 
this from an example online somewhere. I just picked up the book today, so hopefully that should help.

Incidentally is there a good way to get the entire CFG printed/displayed as a *complete* railroad 
diagram? I'd like to put that in my program documentation.

MPinnegar

> 
> Jim
> 
> 
> 
> 
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