[ragel-users] Conditional parsing

[Iñaki Baz Castillo]

Hi,

I'm building a parser for a protocol message similar to HTTP (let's
say: a main header and N key: value separated by CRLF until a final
double CRLF). My concern is:

- I parse the messages in a "Dispatcher" module that just needs to
parse a few fields in each message.
- Then the Dispatcher passes the message to a Worker thread via UNIX Socket.
- And the Worker must parse it again, but in this case I need all the
fields parsed.

Note that during the Worker's parsing, a C++ complex object is build
with all the parsed fields mapped into member variables, so I don't
want to play with those complex objects in the Dispatcher module.

How could I reuse the same Ragel machine for both cases? Of course I
would like something like:



%%{
  machine Parser;

  [...]

  if (dispatcher) {
    main :=  xxxxxxx
  }
  else {
    main := yyyyyyy
  }

}%%



Thanks a lot.


-- 
Iñaki Baz Castillo
<ibc at aliax.net>

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