Stand Alone Erlang

Hakan Mattsson <>
Mon Mar 15 12:01:57 CET 2004

On Fri, 12 Mar 2004, Peter-Henry Mander wrote:

> Do you imply that if the scanner was incorporated into the C driver,
> there would be a speed gain of up to 10 times faster? This would be not
> so negligable!

As the speedup only concerns the scanner part, it depends largly on
how much else your application is doing besides scanning.

> It wasn't too trivial (for me a least!) writing the whole SIP codec in
> Erlang from the ABNF specs, including tel-URI. It took me a couple of
> weeks of trial and error. What would it be like to implement it in
> lex/flex as a C driver?

It depends on how well written the ABNF spec is.
If it maps well to a lex/flex grammar it should not be so much work.

The most work with the Megaco flex scanner was caused by a poor ABNF spec.


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