[antlr-interest] (v3) Token aggregation

[Terence Parr]

actually it's the id+=foo that has been fixed already in my version.

Note the error says idx which means it has nothing to do with the  
rule you provide.

Ter
On Aug 5, 2006, at 10:33 AM, Sean Walton wrote:

> I found that the "$id+" is not available in the backtracking mode.   
> eeek.
> -sean
>
> Sean Walton wrote:
>> With a grammar such as:
>>
>> path
>>    : id+=IDENTIFIER ('.' id+=IDENTIFIER) -> ^(PATH $id+)
>>    ;
>>
>> Are there option incompatibilities?  Currently, when I use the $id 
>> + in the AST section, I get:
>>
>> ANTLR Parser Generator   Early Access Version 3.0b3 (July 21,  
>> 2006)  1989-2006
>> 0:0: syntax error: assign.types: <AST>:141:55: unexpected AST  
>> node: idx
>> 0:0: syntax error: assign.types: <AST>:0:0: expecting EOB, found  
>> '<end-of-alt>'
>> 0:0: syntax error: assign.types: <AST>:0:0: unexpected end of subtree
>> 0:0: syntax error: define: <AST>:141:55: unexpected AST node: idx
>> 0:0: syntax error: define: <AST>:0:0: expecting EOB, found '<end- 
>> of-alt>'
>> 0:0: syntax error: define: <AST>:0:0: unexpected end of subtree
>> 0:0: syntax error: buildnfa: <AST>:141:55: unexpected AST node: idx
>> internal error: ANesC.g : java.lang.NullPointerException
>> org.antlr.tool.NFAFactory.build_AlternativeBlock(NFAFactory.java:373)
>> org.antlr.tool.TreeToNFAConverter.block(TreeToNFAConverter.java:779)
>> org.antlr.tool.TreeToNFAConverter.rule(TreeToNFAConverter.java:548)
>> org.antlr.tool.TreeToNFAConverter.rules(TreeToNFAConverter.java:374)
>> org.antlr.tool.TreeToNFAConverter.grammarSpec 
>> (TreeToNFAConverter.java:328)
>> org.antlr.tool.TreeToNFAConverter.grammar(TreeToNFAConverter.java: 
>> 188)
>> org.antlr.tool.Grammar.createNFAs(Grammar.java:677)
>> org.antlr.tool.Grammar.checkAllRulesForLeftRecursion(Grammar.java: 
>> 1288)
>> org.antlr.codegen.CodeGenerator.genRecognizer(CodeGenerator.java:276)
>> org.antlr.Tool.processGrammar(Tool.java:320)
>> org.antlr.Tool.process(Tool.java:251)
>> org.antlr.Tool.main(Tool.java:70)
>>
>> When I use $id, it "works" (but I only get the first token in the  
>> loop).  The grammar I adopted has "memoize" and "backtrack".  Are  
>> these the problem?  Also, what does "memoize" mean (it's not  
>> defined in the WIKI)?
>>
>> -Sean
>