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

[Alexandre Porcelli]

I still trying to fix it.. and I could observe that when I change the
following Lexical Rules using a simple semantic predicate, it works
(the result is OK):

 LABEL_STATEMENT
         : {!isLineContinuation && getCharPositionInLine() == 0}? WS? LABEL_NAME
         ;

 LINE_NUMBER
         : {!isLineContinuation && getCharPositionInLine() == 0}? WS?
LINE_NUMBER_DIGIT
         { token = Token.SKIP_TOKEN;}
         ;

 But... I got an output messages reporting some problems with a failed
predicate:

  line 8:2 rule LABEL_STATEMENT failed predicate: {!isLineContinuation
 && getCharPositionInLine() == 0}?
  line 9:2 rule LABEL_STATEMENT failed predicate: {!isLineContinuation
 && getCharPositionInLine() == 0}?
  line 10:2 rule LABEL_STATEMENT failed predicate:
{!isLineContinuation  && getCharPositionInLine() == 0}?
  line 11:2 rule LABEL_STATEMENT failed predicate:
{!isLineContinuation  && getCharPositionInLine() == 0}?
  line 11:12 rule LABEL_STATEMENT failed predicate:
{!isLineContinuation  && getCharPositionInLine() == 0}?
  line 11:18 rule LABEL_STATEMENT failed predicate:
{!isLineContinuation  && getCharPositionInLine() == 0}?
  line 12:6 rule LABEL_STATEMENT failed predicate:
{!isLineContinuation  && getCharPositionInLine() == 0}?

Any suggestion? Any help is welcomed!

Thanks in Advance!
Alexandre Porcelli

>
> On 4/11/07, Alexandre Porcelli <porcelli at uol.com.br> wrote:
> > 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
> >
>