[MacPerl] Two-pass droplet?

[Rich Lafferty <rich@alcor.concordia.ca>]

I'm in the process of writing a droplet which fills in missing data in
a flatfile database.

Unfortunately, it needs to make a complete pass of the database in
order to read in the information that it'll be using to fill in the
missing information.

As far as I can tell, this means that I need to do two passes -- one
to build the hash that contains the information that will be missing
from some of the records, and another to go through and add the
information where it's missing.

I can't for the life of me figure out a way in which I can do two
passes but still have a droplet -- in other words:

while(<>) {
    add_to_hash($_);
}

# back to beginning of file here!

while(<>) {
    fill_in_missing_bits($_);
}

.. and I can't get back to the beginning of the file.

Suggestions?

  -Rich

-- 
------------------------------ Rich Lafferty ---------------------------
 Sysadmin/Programmer, Information and Instructional Technology Services
   Concordia University, Montreal, QC                 (514) 848-7625
------------------------- rich@alcor.concordia.ca ----------------------


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