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Config::General::Interpolated - Parse variables within Config files
use Config::General;
$conf = new Config::General(
-ConfigFile => 'configfile',
-InterPolateVars => 1
);
Normally you don't call it directly.
If you define a variable inside a block or a named block then it is only visible within this block or within blocks which are defined inside this block. Well - let's take a look to an example:
# sample config which uses variables
basedir = /opt/ora
user = t_space
sys = unix
<table intern>
instance = INTERN
owner = $user # "t_space"
logdir = $basedir/log # "/opt/ora/log"
sys = macos
<procs>
misc1 = ${sys}_${instance} # macos_INTERN
misc2 = $user # "t_space"
</procs>
</table>
This will result in the following structure:
{
'basedir' => '/opt/ora',
'user' => 't_space'
'sys' => 'unix',
'table' => {
'intern' => {
'sys' => 'macos',
'logdir' => '/opt/ora/log',
'instance' => 'INTERN',
'owner' => 't_space',
'procs' => {
'misc1' => 'macos_INTERN',
'misc2' => 't_space'
}
}
}
As you can see, the variable sys has been defined twice. Inside the <procs> block a variable ${sys} has been used, which then were interpolated into the value of sys defined inside the <table> block, not the sys variable one level above. If sys were not defined inside the <table> block then the ``global'' variable sys would have been used instead with the value of ``unix''.
Variables inside double quotes will be interpolated, but variables inside single quotes will not interpolated. This is the same behavior as you know of perl itself.
In addition you can surround variable names with curly braces to avoid misinterpretation by the parser.
Thomas Linden <tom@daemon.de> Autrijus Tang <autrijus@autrijus.org> Wei-Hon Chen <plasmaball@pchome.com.tw>
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
See <http://www.perl.com/perl/misc/Artistic.html>
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