Hi Jonathan,
Ragel does not do any buffering of text for you. It's up to you to
decide how you want to do that, then implement it yourself. There are a
couple options. You can copy text to a buffer as you move over
characters, or you can extract them from the input buffer when you need
them. The first approach is simpler and guaranteed to work without
hitches. The second technique is faster, but you have to consider buffer
block boundaries.
-Adrian
On 10-09-28 08:30 PM, Jonathan Castello wrote:
Hello,
I'm building a Telnet parser using Ragel, and I'm having an issue
making the actions do what I want. I've pasted the machine definition
to a gist: http://gist.github.com/602242
The issue is a little hard for me to describe, so I'll try to
illustrate it as best as I can. If I have a stream of input, and some
part of it is "abcdef<IAC><GA>ghi" (where<x> is a mnemonic for a
single byte), I want to emit events as such: text("abcdef"),
command("<GA>"), text("ghi"). The caller provides callbacks, and I
would pass the data to them as I interpret it.
The problem is that I can't figure out how to define actions that
would only trigger when the next character doesn't match plain_text
(or there's no more data left to parse in that particular packet), so
I can get that full stretch of characters. At the moment, I can only
get text("a"), text("b"), text("c") etc. to work, i.e. one plain_text
match at a time.
I suspect the problem is that cr_sequence and iac_sequence are
supposed to behave this way - they, too, match singular "terms" each
time before returning to the start - but here I am, wanting to give
plain_text special treatment. Am I even coming at this from the right
angle?
Thanks in advance for any advice!
~Jonathan Castello
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