[antlr-interest] How does one handle variable number of function parameters?

[Rob Greene]

I'm sorry, but I'm still totally lost. I've chopped out everything
except numbers and the function calls trying to simplify, but no
luck... Here's the code that doesn't work, I'm hoping somebody can
straighten me out. Anything with more than two "#" characters is
simply copy & pasted.  :-)
-Rob

class FunctionParser extends Parser;

options {
	buildAST = true;
	k = 1;
	exportVocab  = Function;		// name of the vocabulary
}

imaginaryTokenDefinitions
	: ARGLIST
	;

expression
	: NUMBER
	| IDENTIFIER LPAREN^ argList RPAREN!
	| LPAREN! expression RPAREN!
	;
argList
	: expression (COMMA! expression)* { ## = #( #[ARGLIST,"ARGLIST"], ## ); }
	;


class FunctionLexer extends Lexer;

options {
	caseSensitive=false;
	k = 2;
	exportVocab = Function;		// name of the vocabulary
}

IDENTIFIER
	options { testLiterals = true; }
	: 'a'..'z' ( 'a'..'z' | '0'..'9' )*
	;

NUMBER
	: ('0'..'9')+ ( '.' ('0'..'9')+ )?
	;

// Whitespace -- ignored
WS	: ( ' '
	|	'\t'
	|	'\f'
	| ( "\r\n"  // Evil DOS
	  | '\r'    // Macintosh
	  | '\n'    // Unix (the right way)
	  )
	)
	{ $setType(Token.SKIP); }
	;

LPAREN
	: "("
	;
RPAREN
	: ")"
	;
COMMA
	: ","
	;


class FunctionTreeParser extends TreeParser;

expression returns [double value]
{
	double a,b;
	value = 0;
}
	:	n:NUMBER { value = Double.parseDouble(n.getText());
				   System.out.println("number = " + value); }
	|	i:IDENTIFIER
//			( arg=expression { System.out.println("Adding argument " + arg); })*
			{ System.out.println("Executing function " + i.getText()); }
	;
argList
	:	#( ARGLIST
			(
				d:expression { System.out.println("expression = " + d); }
				(
					e:expression { System.out.println("expression = " + e); }
				)*
			)?
		)
	;