Re: [Linuxsampler-devel] Lates CVS commit

[Christian S. <chr...@ep...>]

Es geschah am Sonntag, 7. M=E4rz 2004 21:37 als Rui Nuno Capela schrieb:
> Vladimir,
>
> > But . . . bison also works and it is easier to maintain :)
> > Could you give me a quick summary of why you dislike bison?
>
> Yeah I know, but I don't have a clue about all that bison/flex/yacc stuff.
> I know the principles and theory but completely lack in the practice.

As already said, I can give a short introduction if anybody's interested,=20
constrained to the things we actually need. It's really simple.

> > I wrote a simple netcat script to test the parser (attached) and i'm
> > having some issues with your parser, while bison generated code appears
> > to be working correctly.
>
> Hmm. If I may put this way, that's not a parser question but a network
> protocol one, AFAICT. On liblscp, each command must be isolated on each
> send/recv exchange and does not rely on being CR/LF terminated, which I
> think is an "undocumented" feature of the bison one :)

Undocumented? src/network/lscp.y is the LSCP definition, given in Backus-Na=
ur=20
=46orm (BNF), which is commonly used in all protocol definition documents (=
e.g.=20
HTTP) and many file format references, so this file _is_ a document and fro=
m=20
lscp.y:

input	:  line
		|  input LF line
		|  input CR LF line
		;

> I think netcat sends the whole buffer of commands in one send(), and that
> is not accepted on liblscp (probably only the first line is). AFAICT the
> protocol draft doesn't mention that we can send more than one command, as

Page 3 from the LSCP document:

"The frontend application establishes a TCP connection to the LinuxSampler=
=20
instance on a certain host system. Then the frontend application will send=
=20
certain ASCII based commands"

But you're right. It's not clear enough. I will fix that. That was an impli=
ed=20
assumption fault by me, because usually network protocols allow this multi=
=20
line behavior, because it doesn't make sense to establish a new connection=
=20
for every single network command.

CU
Christian