[antlr-interest] Trouble with comma separated list

[Jason]

Hello,

I've written the following simple grammar to process a
list of 'where's.

//BEGIN GRAMMAR
class P extends Parser;

startRule
  :
  item_list;

item_list:
  item  { System.out.println("item_list : item"); }
(COMMA item)*  { System.out.println("item_list :
(COMMA item)*"); }
    ;
  
item : WHERE  { System.out.println("item : WHERE"); }
;

class L extends Lexer;

tokens
{
  WHERE = "where";
  COMMA = ",";
}

NAME options { testLiterals=true; } : (',' |
'a'..'z'|'A'..'Z')+ {  } //NEWLINE
  ;

// Whitespace -- ignored
WS	:	(	' '
		|	'\t'
		|	'\f'
			// handle newlines
		|	(	options {generateAmbigWarnings=false;}
			:	"\r\n"  // Evil DOS
			|	'\r'    // Macintosh
			|	'\n'    // Unix (the right way)
			)
			{ newline(); }
		)+
		{ _ttype = Token.SKIP; }
	;
//END GRAMMAR

This handles input of the following form:

'where , where , where , where'

but chokes on something like:

'where , where, where'

In other words it requires that there be a space
between the 'where' token and the ',' token.  I
understand why this is happening but it's not clear to
me how to fix it.  If anyone can point me towards the
relevent option (or some other solution), I'd greatly
appreciate it.  Thanks.

-jason


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