[antlr-interest] lexical nondeterminism between IDENT & LABEL

[thoth2487]

Hi to all, I've a very simple language in which there are IDENTifiers
and jump LABELs. An IDENTifier start with ('a'...'z')|('A'..'Z') and
continue with ('a'...'z')|('A'..'Z')|('0'..'9') and a LABEL is like an
IDENTifier but ends with a ':'. When I try following .g I obtain
always a lexical nondeterminsim which I isn't to solve:

//
//	QCL	parser
//
class QCLParser extends Parser;

task_unit
	:	(	EOL				{ System.out.println("<EOL>"); }
		|	n:SL_COMMENT	{ System.out.println("<SL_COMMENT = '" + n.getText()
+ "'"); }
		|   m:IDENT			{ System.out.println("<IDENT = '" + m.getText() + "'"); }
		|   o:LABEL			{ System.out.println("<LABEL = '" + o.getText() + "'"); }
		)*
		EOF!
	;


//
//	QCL	lexer
//
class QCLLexer extends Lexer;

options	{
	k =	2;								// characters of lookahead
	caseSensitive =	true;				// enable case sensitive mode
	charVocabulary = '\0'..'\377';		// ANSI	range 0..255
}

// whitespace
WS
	:	(	' '
		|	'\t'
		|	'\f'
		)
		{ $setType(Token.SKIP);	}
	;
	
// end of line
EOL
	:	(	"\r\n"		// DOS & Windows file format
		|	'\r'		// Macintosh file format [6.0.1]
		|	'\n'		// Unix	file format	[6.0.1]
		)
		{ newline(); }
	;
	
// single line comment
SL_COMMENT
	:	';'
		(~(	'\r' | '\n'	))*
	;
	
// identifier
IDENT
  	: 	('a'..'z' | 'A'..'Z') 
  		('a'..'z' | 'A'..'Z' | '0'..'9')*
	;
	
// label
LABEL
  	: 	('a'..'z' | 'A'..'Z') 
  		('a'..'z' | 'A'..'Z' | '0'..'9')*
  		':'
	;

Example:

MAIN    is an IDENT
MAIN:   is a LABEL

Can you help me ?

Thank you very much
Silverio Diquigiovanni








 
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