Ok, your rule subrule:
( {action}
| GOTO_? t=SOMENAME_ {action}
)
will never match 2nd alt. it's backtracking over blank first alt and matches
it. reverse them.
also, it exposed a bug in antlr backtracking alt detection.
Jim: I pushed to antlr3-main and 3.4 if you want to make another build.
Ter
On Jun 24, 2011, at 8:06 AM, Justin Murray wrote:
> Decided to give this a run on my C-target grammar. I'm getting the
> following error:
>
> 1> [exec] org\antlr\grammar\v3\DefineGrammarItemsWalker.g: node from
> line 290:15 required (...)+ loop did not match anything at input
> '<end-of-alt>'
> 1> [exec] error(10): internal error: c:\...\Aerobasic.g :
> java.lang.ClassCastException: org.antlr.runtime.tree.CommonTree cannot
> be cast to org.antlr.tool.GrammarAST
> 1> [exec]
> org.antlr.grammar.v3.DefineGrammarItemsWalker.rewrite(DefineGrammarItemsWalker.java:3464)
> 1> [exec]
> org.antlr.grammar.v3.DefineGrammarItemsWalker.block(DefineGrammarItemsWalker.java:2073)
> 1> [exec]
> org.antlr.grammar.v3.DefineGrammarItemsWalker.rule(DefineGrammarItemsWalker.java:1627)
> 1> [exec]
> org.antlr.grammar.v3.DefineGrammarItemsWalker.rules(DefineGrammarItemsWalker.java:1190)
> 1> [exec]
> org.antlr.grammar.v3.DefineGrammarItemsWalker.grammarSpec(DefineGrammarItemsWalker.java:623)
> 1> [exec]
> org.antlr.grammar.v3.DefineGrammarItemsWalker.grammar_(DefineGrammarItemsWalker.java:315)
> 1> [exec] org.antlr.tool.Grammar.defineGrammarSymbols(Grammar.java:748)
> 1> [exec]
> org.antlr.tool.CompositeGrammar.defineGrammarSymbols(CompositeGrammar.java:369)
> 1> [exec] org.antlr.Tool.process(Tool.java:465)
> 1> [exec] org.antlr.Tool.main(Tool.java:93)
>
> I am not sure where to go from here. Note that this grammar does not
> output an AST, it is just a simple parser. This was working fine with
> ANTLR v3.3.
>
> Thanks,
>
> -- Justin
>
> On 6/23/2011 7:03 PM, Terence Parr wrote:
>> hi, Jim fixed up the C runtime. please test it out:
>>
>> http://antlr.org/download/antlr-master-3.4-beta3-completejar.jar
>> http://antlr.org/download/antlr-master-3.4-beta3-src.jar
>> http://antlr.org/download/antlr-runtime-3.4-beta3-sources.jar
>> http://antlr.org/download/antlr-runtime-3.4-beta3.jar
>>
>> Ter
>>
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