[antlr-interest] how to get the value of an identifier

[Thierry USO]

It works!

LETTER and DIGIT fragment rules and EOL were needed. See below.

grammar ADL; // Rally Application Development Language

constant_definition
: CONST {System.out.print("CONST ");}
(
(' '|'\t')* Identifier {System.out.print($Identifier.text + " ");} (' '|'\t')* 
'=' {System.out.print("= ");} (' '|'\t')* 
CharString {System.out.print($CharString.text + " ");}  
(' '|'\t')* ';' {System.out.println(";");} (' '|'\t')* EOL
)+
;

CONST
: 'CONST'
;

Identifier
: LETTER (LETTER|'_'|DIGIT)+
;

CharString
: '"' (LETTER)+ '"'
;

EOL
: '\r'? '\n'
;

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

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

Thanks again. antlr-interest is great !

>
>Your grammar does not handle New-Line characters ('\n' and possibly
>'\r'). You should have received many "no viable alternative at ..."
>error messages....
>
>As others have stated you should:
>
>1) make LETTER and DIGIT fragement rules.
>2) make ConstDef be a parser rule
>3) when you do 2) you should add a WHITESPACE lexer rule, perhaps
>putting the WHITESPACE (including new-lines) on the HIDDEN channel (e.g.
>{ $channel = HIDDEN; } )
>
>attached is a complete example with the above suggestions applied. Oh by
>the way.... in my example I construct an AST during the parse and then
>print the AST at the end; rather than doing the System.out stuff during
>the parse....
>
>Hope this helps...
>   -jbb
>