How do I report line no. on errors with racc?

ruby-talk
1

Hi:

I am using racc to parse a file. I need to be able to
report a clear error message when a syntax error is
encountered.

I don’t think this can be done in the tokenizer (#parse)
and I don’t see how on_error yields a line number.

Any help on how to do this would be appreciated.

Thanks

···

–
Jim Freeze

Life would be so much easier if we could just look at the source code.

2

Hi,

In mail “How do I report line no. on errors with racc?”

I am using racc to parse a file. I need to be able to
report a clear error message when a syntax error is
encountered.

I don’t think this can be done in the tokenizer (#parse)
and I don’t see how on_error yields a line number.

I don’t think the parser can know the line number. If the
tokenizer discards line terminators, how the parser counts
line number?

For example, the tokenizer reports line number in Racc
(racc/raccs.rb).

Regards,
Minero Aoki

···

Jim Freeze jim@freeze.org wrote:

3

Thanks. I’ll take a look. BTW, can you add an example of
this in your sample directory?


···

On Sunday, 25 May 2003 at 17:26:28 +0900, Minero Aoki wrote:

Hi,

In mail “How do I report line no. on errors with racc?”
Jim Freeze jim@freeze.org wrote:

I am using racc to parse a file. I need to be able to
report a clear error message when a syntax error is
encountered.

I don’t think this can be done in the tokenizer (#parse)
and I don’t see how on_error yields a line number.

I don’t think the parser can know the line number. If the
tokenizer discards line terminators, how the parser counts
line number?

For example, the tokenizer reports line number in Racc
(racc/raccs.rb).

–
Jim Freeze

“It’s Fabulous! We haven’t seen anything like it in the last half an
hour!”
– Macy’s