[REBOL] Re: Processing files / Any AWK users?
From: tomc:darkwing:uoregon at: 18-Nov-2001 21:00
On Sun, 18 Nov 2001, Gregg Irwin wrote:
> If I'm processing a file, by lines, thus:
>
> foreach line read/lines/with file rec-sep [
>
> It appears that foreach doesn't call read on each pass, but I thought I'd
> ask to see if anyone knows, for certain. I know you can modify the block
> that foreach uses and it will see the changes, but I wasn't sure what magic
> occurs in this scenario.
>
> The real question, I suppose, is: Should I cache the return value from 'read
> before using it with foreach, or is that unnecessary?
I do this alot, and have worked with the assumption that it is best
(metric: [walltime disk-io]) to read once at the beginning and write once
at the end, and use as many in-memory buffers as I need inbetween.
> As a side question, does anyone on the list use AWK or think that something
> like it (i.e. an auto-driven rule/action file processor) would be useful?
>
what is parse not doing?
