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IDS Forum

Re: Text files

Posted By: Dick Cunningham
Date: Thursday, 30 September 2004, at 5:02 p.m.

In Response To: Text files (Demeis, Tony)

>>> "Demeis, Tony" <Tony.Demeis@moh.gov.on.ca> 09/30/2004 12:05:03 >>>
Hi,
I'm looking for a way to identify and remove extra line feeds or page
eject
codes within an input file.
<<<

Tony,

I once had occasion to remove imbedded CRLF's from an extract file. I
used a perl script, which follows. Two things: 1) it was designed around
the fact that the file was supposed to contain records with 10 fields
separated by 9 pipes, and only one of the fields ("description" - see
imbedded comments) might contain extraneous CRLF's, and 2) it was a
quick-and-dirty, so I'm not excessively proud of it. That said, it may
give you some ideas, so here you are, warts and all:

#!/usr/bin/perl
$count = @ARGV;
if (!count) {
print "Usage: perl crstrip.pl inpfile\n";
exit;
} else {
$d = $ARGV[0];
}

open (FILEIN, $d) || die "Couldn't open $d\n";
open (FILEOUT, ">bldg_permit_correct.txt") || die "Couldn't open
output\n";
open (FILEBUST, ">bldg_permit_busted.txt") || die "Couldn't open
busted\n";

$lc = 0;
$pipepos = 0;
$pipeoffset = 0;
$busted = 0;
$cumcount = 0;

@inparray;
@outarray;

while (<FILEIN>) {
chomp $_;
$lc += 1;
if (($lc % 100000) == 0) { # write occasional stats
on stdout
print "$lc\n";
}

$pipecount = 0;

# index function doesn't work if char occurs at position 0,
$_ =~ s/^\|/ \|/; # so insert space

$pipepos = index($_, "|"); # count number of pipe
characters
if ($pipepos > 0 ) {
$pipecount = 1;
}
while ($pipepos > 0) {
$pipeoffset = $pipepos + 1;
$pipepos = index($_, "|", $pipeoffset);
if ($pipepos > 0) {
$pipecount += 1;
}
}

if ($pipecount < 9) { # this is a fragmented
row
$busted += 1;
$_ =~ s/\\/ /; # strip spurious escape
characters
$_ =~ s/\n//g; # . and crlf pairs
$_ =~ s/\r//g; # . and solo cr's
@inparray = split('\|', $_);
if ($busted > 1) {
# assume first field is continuation of description
$lastval = pop(@outarray);
if ($pipecount == 0) { # sole contents of
line?
$lastval .= $_; # append to last
array item
push(@outarray, $lastval); # and resave
description
} else {
$lastval .= $inparray[0]; # append to last
array item
push(@outarray, $lastval); # resave
description
shift(@inparray); # description
fragment saved,
push(@outarray, @inparray); # now save the
rest of row
}
} else {
@outarray = @inparray; # start new row in fresh
output array
}
$cumcount += $pipecount;
if ($cumcount >= 9) { # 9 pipes means row
complete
$fullrec = join('|', @outarray);
print FILEBUST "$fullrec|\n"; # write delimited
row
$cumcount = 0; # reset counters
$busted = 0;
}
} else { # undamaged row
print FILEOUT "$_\n"; # write as is
}
}


HTH,

Dick Cunningham
Thurston County, WA, USA

Messages In This Thread

  • Text files
    Demeis, Tony -- Thursday, 30 September 2004, at 3:05 p.m.
    • Re: Text files
      Dick Cunningham -- Thursday, 30 September 2004, at 5:02 p.m.
    • Re: Text files
      JHAYS2@sears.com -- Thursday, 30 September 2004, at 5:17 p.m.
    • Re: Text files
      RICHARD CUNNINGHAM -- Thursday, 30 September 2004, at 5:38 p.m.
    • Re: Text files
      Jean Sagi -- Thursday, 30 September 2004, at 10:53 p.m.

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