GetOption - Perl - Referencing - perl

Question

So I have stumbled upon a little issue when trying to build out a simple "Airport Search Script" in Perl.
my $filename = '/home/student/perl-basic/topic-07/iata_airports.csv';
my $number = '1';
my $matching;
my $latitude;
my $longitude;
my $word = 'false';
GetOptions (
"filename=s" => \$filename,
"number=i" => \$number,
"matching=s" => \$matching,
"latitude=f" => \$latitude,
"longitude=f" => \$longitude,
"word=s" => \$word
);
sub parse_airports {
my $file = shift;
my $csv = Text::CSV->new( { binary => 1, eol => $/ } );
open ( my $fh, "<", $file ), or die "Error opening input file: $!";
my $ra_colnames = $csv->getline ( $fh );
$csv->column_names( #$ra_colnames );
my $ra_airports = $csv->getline_hr_all( $fh );
close ( $fh );
return $ra_airports;
}
sub get_name_matching_airports {
}
my $rah_airports = parse_airports( $filename );
my $rah_airports_found = [];
if ($matching) {
say "Up to $number airports matching $matching in $filename:";
$rah_airports_found = get_name_matching_airports(
airports => $rah_airports,
matching_string => $matching,
word => $word,
);
}
elsif ($latitude && $longitude) {
say "Up to $number airports near [$latitude, $longitude] in $filename:"
}
else {
say "Must have at least --matching, or --latitude and --longitude as arguments";
}
print pp($rah_airports_found);
So where I am struggling is in the "sub get_name_matching_airports"
Because you do not have the file let me explain the file structure.
It is a hash (ALL IATA Airports) with hashes (DETAILS of each airport). There are around 15 keys in each airport hash and one of the keys titles is (NAME). I have opened the file and parsed all the info into a hash ref which is returned at the end of the sub "parse_airports".
In the sub "get_name_matching_airports" I need to find additional airports with similar names based on the argument I passed in, into ($matching).
EXAMPLE: I parse (case-insensitive) "London" as an argument from the command line e.g. ./search_airports2 --matching London. In the sub "get_name_matching_airports" I will need to respond with any airport that has london (case-insensitive) in key(name).
Then push these newly found airports which are similar into the array "rah_airports_found" and in the end print this out.
SO I SOLVED MY PROBLEM WITH THE FOLLOWING CODE:
sub get_name_matching_airports {
my %params = (
airports => undef,
matching_string => undef,
word => undef,
#_
);
my #rah_airports_found;
my $ra_airports = $params{airports};
my $counter = 0;
foreach my $i ( #$ra_airports ) {
if ( $params{word} ) {
if ( $i->{name} eq $params{matching_string} ) {
push #rah_airports_found, $i;
$counter++;
}
}
else {
if ( $i->{name} =~ /$params{matching_string}/i ) {
push #rah_airports_found, $i;
$counter++;
}
if ( defined( $number ) && $counter == $number ) {
return \#rah_airports_found;
}
}
}
return \#rah_airports_found;
}

Answer 1

Example:
for my $Airport_rf (keys %{$rah_airports}) {
if ( $Airport_rf->{NAME} =~ m{\Q$matching\E}xi) {
# do your stuff here
}
}
If you don´t know the exact key of the hashref, you have to match the CLI parameter against all values.