Beefy Boxes and Bandwidth Generously Provided by pair Networks
"be consistent"
 
PerlMonks  

Re: how to read perl variable from a line read from a file

by Anonymous Monk
on Jan 31, 2013 at 15:17 UTC ( #1016336=note: print w/ replies, xml ) Need Help??


in reply to how to read perl variable from a line read from a file

Hopefully a less hackish (safer) solution than what has been offered so far. We use a hash called %vars to contain your variables because it's simply a good idea.

use Data::Dumper; my %vars; # set initial variables $vars{'INST'} = 'C'; open my $fh, "<", 'file' or die $!; while (<$fh>) { chomp; m/^(\w+)=(.*)$/ or next; my ($var, $value) = ($1, $2); $value =~ s/\$([a-z]+)/ $vars{$1} /gie; $vars{$var} = $value; } print Dumper(\%vars);
# source file: VAR1=$INST/dirivebase/program VAR2=$INST/origbase/data # output: $VAR1 = { 'VAR1' => 'C/dirivebase/program', 'INST' => 'C', 'VAR2' => 'C/origbase/data' };

You might want to adjust the regexp to be more lenient towards spacing, though...


Comment on Re: how to read perl variable from a line read from a file
Select or Download Code
Re^2: how to read perl variable from a line read from a file
by Bharath666 (Novice) on Jan 31, 2013 at 16:03 UTC

    Thanks!! Its working now....

      It's not perfect. It's missing a close $fh and the substitution regexp probably should be s/\$([a-z]+)/ $vars{$1} || "\$$1" /gie; to give a somewhat sane behaviour for undefined variables (instead of substituting them with the empty string. Which is what *nix shells do, so I guess it's not that bad...)

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1016336]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others rifling through the Monastery: (14)
As of 2015-07-02 10:33 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (33 votes), past polls