[antlr-interest] Matching ellipsis

[Julian Santander]

Folks,

    I'd be very grateful if someone could provide me some guidance on a 
problem I'm having. This is actually my first attempt at a parser using 
ANTLR. I'm using ANTLR beta 5 with Java generation (on a Windows XP 
machine and Java 1.5 if that matters).

    At the lexical level I need to match tokens like '.' (dot) '..'  
(ellipsis), integers and floating point numbers. (Actually I don't need 
sign nor exponential formats)....

    So far one of my many attempts has been:

T_INTEGER_LITERAL: DIGIT+;

DOT:
	('.' (('.')=>{false}? |  ))=> '.'
	;
// This one is copied from http://www.antlr.org/blog/antlr3/lookahead.tml May 2006 post.

T_ELLIPSIS:
	'.' '.'+
	;

T_FLOAT_LITERAL:
  	DIGIT+ DOT DIGIT*
	| DOT DIGIT+
  ;

But so far I'm unable to parse "1..2" into T_INTEGER_LITERAL, 
T_ELLIPSIS, T_INTEGER_LITERAL.

for example: "... .. 1..2 3...4 5.0 .6 7." renders:

TOKEN: T_ELLIPSIS[@-1,0:2='...',<180>,1:0]
TOKEN: WS[@-1,3:3=' ',<168>,channel=99,1:3]
TOKEN: T_ELLIPSIS[@-1,4:5='..',<180>,1:4]
TOKEN: WS[@-1,6:6=' ',<168>,channel=99,1:6]
*TOKEN: T_FLOAT_LITERAL[@-1,7:8='1.',<181>,1:7]
TOKEN: T_FLOAT_LITERAL[@-1,9:10='.2',<181>,1:9]*
TOKEN: WS[@-1,11:11=' ',<168>,channel=99,1:11]
*TOKEN: T_FLOAT_LITERAL[@-1,12:13='3.',<181>,1:12]*
TOKEN: T_ELLIPSIS[@-1,14:15='..',<180>,1:14]
TOKEN: T_INTEGER_LITERAL[@-1,16:16='4',<175>,1:16]
TOKEN: WS[@-1,17:17=' ',<168>,channel=99,1:17]
TOKEN: T_FLOAT_LITERAL[@-1,18:20='5.0',<181>,1:18]
TOKEN: WS[@-1,21:21=' ',<168>,channel=99,1:21]
TOKEN: T_FLOAT_LITERAL[@-1,22:23='.6',<181>,1:22]
TOKEN: WS[@-1,24:24=' ',<168>,channel=99,1:24]
TOKEN: T_FLOAT_LITERAL[@-1,25:26='7.',<181>,1:25]
TOKEN: WS[@-1,27:27='\n',<168>,channel=99,1:27]

I've tried other things (I've seen a post on emitting multiple tokens 
for the same rule, but was apparently not yet supported in v3, I've seen 
also the pascal examples for v2, but somehow I couldn't get them to work??)

Thanks very much in advance and best regards

    Julian




-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.antlr.org/pipermail/antlr-interest/attachments/20061124/f15a6603/attachment-0001.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/x-pkcs7-signature
Size: 10760 bytes
Desc: S/MIME Cryptographic Signature
Url : http://www.antlr.org/pipermail/antlr-interest/attachments/20061124/f15a6603/attachment-0001.bin