Using cd on Variables Post: 302391025

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config::general::interpolated

General::Interpolated(3pm)				User Contributed Perl Documentation				General::Interpolated(3pm)

NAME

       Config::General::Interpolated - Parse variables within Config files

SYNOPSIS

	use Config::General;
	$conf = new Config::General(
	   -ConfigFile	    => 'configfile',
	   -InterPolateVars => 1
	);

DESCRIPTION

       This is an internal module which makes it possible to interpolate Perl style variables in your config file (i.e. $variable or
       "${variable}").

       Normally you don't call it directly.

VARIABLES

       Variables can be defined everywhere in the config and can be used afterwards as the value of an option. Variables cannot be used as keys or
       as part of keys.

       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.

SEE ALSO

       Config::General

AUTHORS

	Thomas Linden <tlinden |AT| cpan.org>
	Autrijus Tang <autrijus@autrijus.org>
	Wei-Hon Chen <plasmaball@pchome.com.tw>

COPYRIGHT

       Copyright 2001 by Wei-Hon Chen <plasmaball@pchome.com.tw>.  Copyright 2002-2010 by Thomas Linden <tlinden |AT| cpan.org>.

       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>

VERSION

       2.14

perl v5.10.1							    2010-12-01						General::Interpolated(3pm)

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