[antlr-interest] [Fwd: Ignoring tokens in AnTLR+Python]

[Daniel Hernandez Bahr]

I am back.

I've just realized that the ignoring should be done in Parser (not in 
Lexer), so I made some adjustments and tried again the construction:

sentence: assignment | macro | other;
other: ~(assignment | macro);

and now I'm getting that the subrule cannot be inverted. Only subrules 
of the form:
    (T1|T2|T3...) or
    ('c1'|'c2'|'c3'...)
may be inverted (ranges are also allowed).

So I am back to the same problem:

How do I ignore the other sentences i don't need?

Best regards,

D.H. Bahr.

-------- Original Message --------
Subject: 	[antlr-interest] Ignoring tokens in AnTLR+Python
Date: 	Thu, 04 Mar 2010 10:14:23 -0500
From: 	Daniel Hernandez Bahr <dbahr at estudiantes.uci.cu>
To: 	antlr-interest at antlr.org <antlr-interest at antlr.org>
References: 
<4a051d931003031537ib220a57jf896cd43fbb5d319 at mail.gmail.com> 
<eae205eee3744a458a11b871a47d2bfe at temporal-wave.com> 
<9362e74e1003040511s48ff2e25h828466dc5639aea1 at mail.gmail.com>



Hello everyone!

I am fairly new to AnTLR. I am working on an interpreter for 
configuration files ('configure.ac' files i should say); but I don't 
need to scan every single token on the files, only variable assignments 
and one or another macro so, my question is:

How can I ignore every other sentence on the files?

At first I intended to do something like

SENTENCE: ASSIGNMENT | MACRO | OTHER;
OTHER: ~(ASSIGNMENT | MACRO)

but i get that ~TOKEN is not allowed in lexer. Is there a way to achieve 
this without me having to define the entire grammar of 'configure.ac' files?

Best regards,

D.H. Bahr

PS: As remarked in subject I am using python and not Java or C.

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