Re: [MacPerl] Two-pass droplet?

["Jefferson R. Lowrey" <lowrey@mailbag.com>]

At 2:20 PM -0400 8/19/99, Rich Lafferty wrote:
>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?

my @files = @ARGV;

foreach my $file (@files) {
    open $file or die "Unable to open $file: $!\n";
    while (<>)	{
    # Pass 1
    };
    seek @_,0,0; #rewind the file
    #could also close, and reopen it.
    while (<>)	{
    # Pass 2
    };
};

-Jeff Lowrey



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