[antlr-interest] Problemns with Predicate using last version...

[Alexandre Porcelli]

I started today develop a Visual Basic 6 grammar based using ANTLR v3
(last build).

I started with just the lexer rules... here is my job result:

grammar VBGrammar;

@lexer::members
{
boolean isLineContinuation = false;
}

compilationUnit
	:	statementList*
	;

statementList
	:	identifier
	|	numeric
	|	label
	;

identifier
	:	IDENTIFIER
	;

numeric	:	NUMERIC
	;

label	:	LABEL_STATEMENT
	;

LABEL_STATEMENT
	: {!isLineContinuation && getCharPositionInLine() == 0}?=> WS?
(LABEL_NAME|DIGIT+ { token = Token.SKIP_TOKEN;})
	;

COMMENT
	:	'\'' (ANY_EXCLUDING_NL
	{
		if(input.LA(1) == '_' && (input.LA(2) == '\r' || input.LA(2) == '\n')){
		    input.consume();
		    input.consume();
		    if (input.LA(1) == '\n'){
			input.consume();
		    }
		}
	})*
		{token = Token.SKIP_TOKEN;}
	;

IDENTIFIER
	: (DIGIT|'_')* LETTER ('-' | LETTER|DIGIT|'_' | '$' | '#')*
	;

NUMERIC
	:	DIGIT+ ('.' DIGIT+)
	|	DIGIT+
	;

WS      : (' ' | '\t' )+
	{ token = Token.SKIP_TOKEN;}
        ;

LINE_CONTINUATION
	:	'_' F_NL
	{ isLineContinuation = true; }
	;

NL 	: ('\r' | '\n')+
	{ token = Token.SKIP_TOKEN; isLineContinuation = false;}
    	;

fragment
LABEL_NAME
	: LETTER (LETTER | '_' | DIGIT)+ ':'
	;

fragment
LETTER
	: 'a'..'z' | 'A'..'Z'
	;

fragment
DIGIT
	: '0'..'9'
	;

fragment
ANY_EXCLUDING_NL
	: '\u0000'..'\t'|'\u000B'..'\f'|'\u000E'..'\uFFFE'
	;

fragment
F_NL 	: ('\r' | '\n')+
	;

I use to test this grammar this file:

'teste
'dkjshfkjs ksjdhf lksjhdf lskjhf lskjdhf ldfsdf _
dsdfsgfhsffd _
asdkjhskjdhfhkj _
soghskjs djkfhglksj lkjshdf glkjhsdf gsfg sdfg


20 teste _
30 teste _
40 sss
50 asdsdfsdf dsfad fjjh
label: teste

Everything seens to be fine... but I got this error when I try to test
this grammar:

line 8:2 no viable alternative at character ' '
line 8:3 no viable alternative at character 't'
line 8:4 no viable alternative at character 'e'
line 8:5 no viable alternative at character 's'
line 8:6 no viable alternative at character 't'
line 8:7 no viable alternative at character 'e'
line 8:8 no viable alternative at character ' '
line 9:0 no viable alternative at character '3'
line 9:1 no viable alternative at character '0'
line 9:2 no viable alternative at character ' '
line 9:3 no viable alternative at character 't'
line 9:4 no viable alternative at character 'e'
line 9:5 no viable alternative at character 's'
line 9:6 no viable alternative at character 't'
line 9:7 no viable alternative at character 'e'
line 9:8 no viable alternative at character ' '
line 10:0 no viable alternative at character '4'
line 10:1 no viable alternative at character '0'
line 10:2 no viable alternative at character ' '
line 10:3 no viable alternative at character 's'
line 10:4 no viable alternative at character 's'
line 10:5 no viable alternative at character 's'
line 11:2 no viable alternative at character ' '
line 11:3 no viable alternative at character 'a'
line 11:4 no viable alternative at character 's'
line 11:5 no viable alternative at character 'd'
line 11:6 no viable alternative at character 's'
line 11:7 no viable alternative at character 'd'
line 11:8 no viable alternative at character 'f'
line 11:9 no viable alternative at character 's'
line 11:10 no viable alternative at character 'd'
line 11:11 no viable alternative at character 'f'
line 11:12 no viable alternative at character ' '
line 11:13 no viable alternative at character 'd'
line 11:14 no viable alternative at character 's'
line 11:15 no viable alternative at character 'f'
line 11:16 no viable alternative at character 'a'
line 11:17 no viable alternative at character 'd'
line 11:18 no viable alternative at character ' '
line 11:19 no viable alternative at character 'f'
line 11:20 no viable alternative at character 'j'
line 11:21 no viable alternative at character 'j'
line 11:22 no viable alternative at character 'h'
line 12:5 no viable alternative at character ':'
line 12:6 no viable alternative at character ' '
line 12:7 no viable alternative at character 't'
line 12:8 no viable alternative at character 'e'
line 12:9 no viable alternative at character 's'
line 12:10 no viable alternative at character 't'
line 12:11 no viable alternative at character 'e'

Any suggestion?

Best Regards,
Alexandre Porcelli