On Monday, July 8, 2002, at 05:05 , Jose Malacara wrote:
[..]
> State=Colorado
> City=Denver
> City=Boulder
> City=Longmont
> State=Texas
> City=Austin
[..]
> This is what I would like the end result to be:
>
> State=Colorado
> City=Denver
> Location=DenverColorado
there are several ways to attack this problem -
but the first thing I like to do is look at the
data from what we starts to glow.[1]
given that you are essentially triggering an
event at two places:
a) when we detect a 'state'
b) when we detect a 'city'
but in the main we essentially print every line.
assume for the sake of the drill that we have all
the input in an @list so we can get it out with the
basic 'for loop' structure. We will need to have
an 'external variable' that will be able to carry
data from one line to the next and so we have
my $current_state;
for (@list) {
print "$_ \n";
#
# solve the state problem here
#
}
well here we bring in our friend split
my ($key, $val) = split(/=/);
if ($key =~ /State/ ) {
$current_state = $val;
elsif ($key =~ /City/) {
print "Location=${current_state{${val}\n";
} else {
# ok, so I was BORN PARANOID
die "neither state nor city with $key, $val\n";
}
the put it together bits with some other ideas are at
http://www.wetware.com/drieux/pbl/perlTrick/HA/growList.txt
ciao
drieux
---
[1]ok, so maybe watching 'beautiful minds'
was not a 'safe' experience...
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