Composite Grammar

[oddg]

I would like to build a grammar from several lexer files so to warm up I tried the following:

//Root.g
grammar Root;
options { language = Ruby; }
import Delegate;
a : 'int' ID ;

//Delgate.g
lexer grammar Delegate;
options { language = Ruby; }
ID : 'a'..'z'+ ;
INT : '0'..'9'+ ;
WS : (' '|'\n')+ {skip();} ;

and got the following messages:

me@mycomputer:~$ antlr4ruby Root.g
warning(24): template error: context [/outputFile /rootGrammarOutputFile /lexer /_sub155 /delegateLexerRule] 3:94 no such property or can't access: null.attributes

It seems that antrl3.2 does not support composite grammar for ruby.

me@mycomputer:~$ antlr3 Root.g
error(10): internal error: group Ruby does not satisfy interface ANTLRCore: mismatched arguments on these templates [treeParser(grammar, name, scopes, tokens, tokenNames, globalAction, rules, numRules, bitsets, labelType, ASTLabelType, superClass, members, filterMode)]

So what options do I have?

[davestevens]

I've just run into this problem too.
It looks like its not actually an issue though, the file RootParser.rb seems to be created with the correct variables.
I found an issue on stackoverflow that suggests it was a problem in 3.5.