I have been working on a code that will parse event information from an Ical feed. It is a huge block of data that I want to divide by key term. I need it to be done in an orderly way. I tried indexing the key terms and then having the program print what is between those indexes. However for some reason it became in infinite loop that printed all the data. I don't know how to fix it. DO NOT RUN MY CODE IT KEEPS FREEZING MY COMPUTER. I was hoping someone could show me what my problem is. 

 DO NOT RUN THIS PROGRAM

use strict;
use warnings;


use LWP::Simple;
use HTML::TreeBuilder;
use HTML::FormatText;

my $URL= get("https://www.events.utoronto.ca/iCal.php?ical=1&campus=0&
+sponsor%5B%5D=&audience%5B%5D=&category%5B%5D=");

my $Format=HTML::FormatText->new;
my $TreeBuilder=HTML::TreeBuilder->new;
 $TreeBuilder->parse($URL);
my $Parsed=$Format->format($TreeBuilder);
open(FILE, ">UOTSUMMER.txt");
print FILE "$Parsed";
close (FILE);

open (FILE, "UOTSUMMER.txt");
my @array=<FILE>;

my $string ="@array";
my $offset = 0;     # Where are we in the string?


my $numResults = 0;

while (1) {
    my $idxSummary = index($string, "SUMMARY", $offset);
    my $result = "";
    my $idxDescription = index ($string, "DESCRIPTION", $offset);
    my $result2= "";
    if ($idxSummary > -1) {
        $offset = $idxSummary + length("SUMMARY");
        my $idxDescription = index($string, "DESCRIPTION", $offset);
        if ($idxDescription == -1) {
            print "(Data malformed: missing DESCRIPTION line.)\n";
            last;
        }
    if ($idxDescription > -1) {
        $offset = $idxDescription+ length("DESCRIPTION");
        my $idxLocation= index($string, "LOCATION", $offset);
        if ($idxLocation == -1) {
            print "(Data malformed: missing LOCATION line.)\n";
            last;
        } 
        
       my $length = $idxDescription - $offset;
        my $length2= $idxLocation - $offset;
        $result = substr($string, $offset, $length);
        $result2= substr ($string, $offset, $length2);
  
        $offset = $idxDescription + length("DESCRIPTION");
        $result =~ s/^\s+|\s+$//g ; # Strip leading and trailing white
#+space,
 $result2 =~ s/^\s+|\s+$//g ; 
                                    # includng newlines.
        $numResults++;
    } else { 
        print "(All done. $numResults result(s) found.)\n";
        last;
    }
   
open (FILE2, "UOT123.txt")
print FILE2 "TITLE: <$result>\n DESCRIPTION: <$result2>\n";

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Any guidance you may have will be greatly appreciated! Thanks!

In reply to Difficulty with Logic parsing ICAL feed by ChocolateCake

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