[antlr-interest] Matching the * character

[Steve O'Hara]

I'm new to Antlr so forgive me if this is a stupid question...
I'm trying to match a database search criteria that looks like the
following;

 

'some text'*, *'more criteria' & 'more criteria'*


My grammar is;

 

expression

    : subExpression (WS? (COMMA | AMPERSAND) WS? subExpression)*

    ;

 

subExpression

    : WS? (Identifier | subExpressionText) WS?

    ;

 

subExpressionText

    :  (STAR | QUESTION*)? QuotedString  (STAR | QUESTION*)? WS?

    ;

 

Letter : 'a'..'z' | 'A'..'Z' | '_' | '\u0080'..'\ufffe' ;

Digit : '0'..'9' ;

Identifier : Letter (Letter | Digit)* ;

QuotedString :'\'' (~'\'')* '\'' ;

WS : (' ' | '\t' | '\n' | '\r')+ ;

 

COMMA : ',' ;

AMPERSAND : '&' ;

QUESTION : '?' ;

STAR : '*' ;


The parser finds the first quoted string (some text) but fails after
that with a NoViableAltException. If I change the * to ? it works fine.
I'm waiting for delivery of the reference manual so maybe I'm breaking
some sort of golden rule here, but any help would be greatly
appreciated.

Steve

 

Steve O'Hara
Pivotal Solutions  

( +44 (0)7802 484227
    +44 (0)208 660 7288 (Fax)
*  sohara at pivotal-solutions.co.uk <mailto:> 

 

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