Hi all.
Sorry for posting the hole "parsing files" thing, it was rather stupid
and i figured it out later.
The thing is, I have defined the rules for the assignments and macros,
and made a sample input file containing only such instructions i'm
posting the first lines so you have a clearer idea:
SWIG_LDFLAGS="$LDFLAGS"
INSTALL="$abs_srcdir/$INSTALL"
APR_VER_REGEXES=["0\.9\.[7-9] 0\.9\.1[0-9] 1\."]
APU_VER_REGEXES=["0\.9\.[7-9] 0\.9\.1[0-9] 1\."]
as can be seen there are only assignments in the first four lines and
the assignment rule looks like this:
sentences : sentence (sentences)?;
sentence : assignment | macro;
assignment : w:WORD EQUAL^ v:value
{
w = w.getText()
e = Exception ("%s is not a valid identifier" %(w))
print w, "::",
if (not w[0].isalpha()):
raise e
else:
try:
index = w.index(".")
index = w.index("-")
raise e
except ValueError:
index = -1
}
;
value : WORD | s:STRINGLIT
{
print s.getText()
}
;
yet when i run the lexer/parser script i get this:
"$LDFLAGS"
SWIG_LDFLAGS :: UNEXPECTED CHAR: 0xA
does anyone knows what i am doing wrong here??
Best regards,
D.H. Bahr
Daniel Hernandez Bahr wrote:
> 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 <[email protected]>
> To: [email protected] <[email protected]>
> References:
> <[email protected]>
> <[email protected]>
> <[email protected]>
>
>
>
> 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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