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Re: Possible to refer to variable defined later in script?

by marto (Bishop)
on Nov 12, 2012 at 15:56 UTC ( #1003471=note: print w/replies, xml ) Need Help??

in reply to Possible to refer to variable defined later in script?

Wouldn't the simple (and sane) thing be to output the HTML after you have processed your input and given values to variables? Also, you may want to consider using HTML::Template or similar to separate your Perl code from your HTML/CSS/JS.

You could also consider making this a dynamic page rather than writing a static HTML file each time the script runs. Though this may be out of scope for this coursework.


I don't know if this is your entire code, but I'd suggest adding use strict; use warnings; (see Use strict and warnings or search for more), ensure you're opening files properly by checking for errors, for example:

open (LOG, '<', 'IN-access.log') or die "cannot open < IN-access.log: +$!";

Such things help prevent facepalm.

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[Corion]: The "and I understand it" part is optional.
[Corion]: ambrus: Yes but I also need to implement the file / IO watcher, because Prima has that (in Prima::File), and I need to supply the appropriate thing to make push_write etc. work with Prima
[ambrus]: Corion: yes, you need to implement the io watcher, which should be simple because Prima::File is basically that, and the timer watcher form Prima::Timer
[Corion]: ... or so I think. As I said, I'm somewhat vague on how to make AnyEvent cooperate with a callback-driven IO event loop that gives me callbacks when data is available or can be written
[ambrus]: what push_write thing? I don't think you need that. that's implemented generically by AnyEvent::Handle
[Corion]: ambrus: Yeah, that's what I think as well. But you give me an idea, maybe I should start with implementing the timer, as that should be far simpler and with fewer edge-cases/nasty interaction than the file watcher
[ambrus]: You only provide the watcher part that tells when the handle is readable or writable, not the actual writing and reading.
[Corion]: ambrus: Hmmm. It makes sense that AnyEvent would implement the push_write itself, but I think I don't have a good idea of where the boundary between AnyEvent and the underlying event system lies... Implementing the timer should give me a better idea
[ambrus]: Corion: push_write is in the higher level abstraction of AnyEvent::Handle, not in the watcher
[Corion]: ambrus: Hmm - rereading Prima::File, that merrily coincides with what Prima does - it tells you "you can read", and you're supposed to read from the fh yourself. I thought it called you with the data already read, which would've been harder to integrate

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