Hello, I would suggest to look into the solution for abbreviated keywords, which could work out here as well, if I correctly understand your concern.
You could realize a generic lexer rule for identifier. Code associated with that rule could look into the database and obtain the correct token id depending on the content (text) of the identifier matched by the lexer. The parser would then only work with token IDs and look like a "normal" Antlr grammar without lots of predicates. Freundliche Grüße / Best Regards Lars von Wedel _________________________________________ Bayer Technology Services GmbH BTS-PT-PD-ES Leverkusen, E 41 Phone: +49 214 30 56456 Fax: +49 214 30 62677 E-mail: [email protected] Web: www.bayertechnology.com Geschäftsführer: Achim Noack Aufsichtsratsvorsitzender: Dr. Wolfgang Plischke Sitz der Gesellschaft: Leverkusen | Eintragung: Amtsgericht Köln, HRB 49896 "Heiko Folkerts" <[email protected]> Gesendet von: [email protected] 17.08.2009 12:04 An <[email protected]> Kopie Thema [antlr-interest] Using predicates for keywords Hi, I want to use an abstract syntax in wich the keyword e.g. for an if statement is available at runtime with a database call. So I don't want to hard code 'if' in the parser but use an expression for a ifkeyword which checks the database and returns wether the token is an if keyword or not. I've tried with syntactic and semantic predicates, but even after reading the sections from the antlr reference I don't know which way is the right one for me. The grammar would like something like this: Statement: Ifexpresseion | loopexpression ; Ifexpression: ifkeyword condition thenkeyword actionexpression; Loopexpression: loopkeyword condition ':' actionexpression; So how to code the ifkeyword and loopkeyword rules? Thx in advance. Btw.: thx to Jim for the help compiling the generated C code. Mit freundlichem Gruß Heiko Folkerts Systementwicklung und -design -- ______________________________________________ DAVID GmbH · Wendenring 1 · 38114 Braunschweig Tel.: +49 531 24379-14 Fax.: +49 531 24379-79 E-Mail: mailto:[email protected] WWW: http://www.david-bs.de Eintragung: Amtsgericht Braunschweig, HRB 3167 Geschäftsführer: Frank Ptok ______________________________________________ List: http://www.antlr.org/mailman/listinfo/antlr-interest Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-email-address --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "il-antlr-interest" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/il-antlr-interest?hl=en -~----------~----~----~----~------~----~------~--~---
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