[antlr-interest] Token stream filter

[srihari]

Hello!

Can someone guide me to some good document on ANTLR.
I need to write some grammer files for generating AST.But i dont know where
to start.

basically i need to understand what are these grammer file?
A good tutorial or notes from some one will help.

Thanks in adv

Srihari

-----Original Message-----
From: Anthony Youngman [mailto:Anthony.Youngman at ECA-International.com]
Sent: Wednesday, June 02, 2004 3:44 PM
To: antlr-interest at yahoogroups.com
Subject: [antlr-interest] Token stream filter


This sounds like it should be very easy, but I can't see how to do it
...

I want to filter the token stream coming out of the lexer (and I can't
see how to do it using the lexer's filter - can I do the same thing in
the parser?). Anyways, I want to match the following sequence

(newline | semi) ("rem" | "*" | "!" ) ~( "=" | "(" ) ({greedy=false} .)
newline)

eating everything EXCEPT the newline, which needs to be passed through
to the parser. Note also, that while "*" and "!" are tokens, "rem" is an
ident. Of course, if I need "rem" to be a token, presumably if this rule
fails I can convert it back to an ident?

Or do I need to write my own token stream to do this (if so, where do I
look for an example?)

Cheers,
Wol


****************************************************************************

This transmission is intended for the named recipient only. It may contain
private and confidential information. If this has come to you in error you
must not act on anything disclosed in it, nor must you copy it, modify it,
disseminate it in any way, or show it to anyone. Please e-mail the sender to
inform us of the transmission error or telephone ECA International
immediately and delete the e-mail from your information system.

Telephone numbers for ECA International offices are: Sydney +61 (0)2 8272
5300, Hong Kong + 852 2121 2388, London +44 (0)20 7351 5000 and New York +1
212 582 2333.

****************************************************************************



 
Yahoo! Groups Links



 



 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
     http://groups.yahoo.com/group/antlr-interest/

<*> To unsubscribe from this group, send an email to:
     antlr-interest-unsubscribe at yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
     http://docs.yahoo.com/info/terms/
 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: winmail.dat
Type: application/ms-tnef
Size: 3044 bytes
Desc: not available
Url : http://www.antlr.org/pipermail/antlr-interest/attachments/20040602/1fb7b708/winmail.bin