Presuming that "latest beta" is antlr-3.4rc2-complete.jar, i get:
java -jar /Users/Local/antlr-3.4rc2-complete.jar Empty.g
javac -cp /Users/Local/antlr-3.4rc2-complete.jar EmptyParser.java
EmptyParser.java:167: exception org.antlr.runtime.RecognitionException is never
thrown in body of corresponding try statement
catch (RecognitionException re) {
^
1 error
On 2011 Jul 1, at 15:12, Terence Parr wrote:
> i fixed this in latest beta for 3.4...can you try that?
> Ter
> On Jul 1, 2011, at 3:10 PM, Trevor John Thompson wrote:
>
>> I have a grammar in which i wish to create an imaginary AST node, and then
>> have an action treat that node. The most straightforward expression i have
>> devised is:
>> grammar Empty;
>> options {output=AST;}
>> tokens {Imaginary;}
>> @members {void treat(Object t){}}
>>
>> parse: empty EOF! {treat($empty.tree);};
>> empty: ->^(Imaginary);
>>
>> However, the generated EmptyParser.java fails to compile because empty()
>> catches RecognitionException, which is never thrown.
>>
>> I am working around this by:
>> empty: ->^(Imaginary)|Imaginary;
>> which works because the imaginary token can never be produced by the lexer.
>>
>> Is there some other way i should be going about this?
>> --
>> Trevor John Thompson (425) 246-4023
>> net: [email protected]
>> Quidquid Latine scriptum sit, altum videtur.
>>
>>
>> List: http://www.antlr.org/mailman/listinfo/antlr-interest
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