[antlr-interest] Quoted Name Value Pairs

[Jesse Anderson]

Also, here is the complete file.

grammar bcadmin;

tokens {
    ADD    = 'add';
    REMOVE    = 'remove';
    SET     = 'set';
    LIST    = 'list';
   
    /* Possible tokens for values */
    ID    = 'id';
    WORKSPACE = 'workspace';
    TARGET    = 'target';
    PATTERN    = 'pattern';
    USER    = 'user';
    START    = 'start';
    FILESIZE = 'filesize';
    THROTTLE = 'throttle';
    STATUS    = 'status';
}

@members {
    public static void main(String[] args) throws Exception {
        bcadminLexer lex = new bcadminLexer(new ANTLRFileStream(args[0]));
           CommonTokenStream tokens = new CommonTokenStream(lex);

        bcadminParser parser = new bcadminParser(tokens);

        try {
            parser.expr();
        } catch (RecognitionException e)  {
            e.printStackTrace();
        }
    }
}

/*------------------------------------------------------------------
 * PARSER RULES
 *------------------------------------------------------------------*/

expr        : ( add | remove | set | list )* ;

add        : ADD addterms SEMICOLON ;

addterms     : ( WHITESPACE ( WORKSPACE | TARGET | PATTERN | USER | 
START | FILESIZE | THROTTLE | STATUS ) equalsvalue )* ;

remove        : REMOVE removeterms SEMICOLON ;

removeterms    : WHITESPACE ID equalsvalue ;

set        : SET setterms SEMICOLON ;

setterms    : ( WHITESPACE ( ID | WORKSPACE | TARGET | PATTERN | USER | 
START | FILESIZE | THROTTLE | STATUS ) equalsvalue )* ;

list        : LIST listterms SEMICOLON ;

listterms    : ( WHITESPACE WORKSPACE equalsvalue )? ;

equalsvalue     : EQUALS QUOTEDVALUE ;

/*------------------------------------------------------------------
 * LEXER RULES
 *------------------------------------------------------------------*/

QUOTEDVALUE : '"' (~'"')* '"' ;

WHITESPACE : WHITESPACECHAR+ ;

WHITESPACECHAR : ( '\t' | ' ' | '\r' | '\n'| '\u000C' ) ;

EQUALS : ( '=' ) ;

SEMICOLON : ( ';' )+ ;


Jesse Anderson wrote:
> Gavin Lambert wrote:
>> At 07:29 23/04/2008, Jesse Anderson wrote:
>> >Here is my file:
>>
>> You've left some of the rules out, so it's hard to give a complete 
>> answer.  But for starters:
>>
>> >WHITESPACE : WHITESPACECHAR+ ;
>> >
>> >WHITESPACECHAR : ( '\t' | ' ' | '\r' | '\n'| '\u000C' ) ;
>>
>> WHITESPACECHAR should be a fragment.
>>
>> >SEMICOLON : ( ';' )* ;
>>
>> This permits SEMICOLON to match nothing, and lexer rules that can 
>> match nothing are a big no-no.  Either change the * to a + or remove 
>> it entirely and match multiple SEMICOLON tokens in the parser.
>>
>> When you're starting out, it's useful to write a test harness for the 
>> lexer alone; feed it some sample input and print out the tokens it 
>> generates.  You'll often find that the parser isn't behaving the way 
>> you expect because it's getting different tokens than you expect.  
>> ANTLRworks currently doesn't really show this very well.
>>
> I tried that.  Still no joy.  I changed it to:
>
> SEMICOLON : ( ';' )+;