NAME

       Config::Model::Role::ComputeFunction - compute &index or &element functions

VERSION

       version 2.117

SYNOPSIS

        $value->eval_function('index');
        $value->eval_function('element');

        $value->eval_function('index','-');
        $value->eval_function('index','- -');
        $value->eval_function('index','-3');

        $value->compute_string('&element(-)')
        $value->compute_string('&index(- -)');

DESCRIPTION

       Role used to let a value object get the index or the element name of $self or of a node
       above.

METHODS

   eval_function
       Retrieve the index or the element name. Parameters are

        ( function_name , [ up  ])

       function_name
           "element" or "index"

       up  Optional parameter to indicate how many level to go up before retrieving the index or
           element name. Each "-" is equivalent to a call to "parent|Config::Model::Node/parent".
           Can be repeated dashes (""-"", ""- -"", ...)  or a dash with a multiplier (""-"",
           ""-2"", ...). White spaces are ignored.

   compute_string
       Perform a similar function as "eval_function" using a string where function names are
       extracted.

       E.g. "compute_string('&element(-)')" calls "eval_function('element','-')"

AUTHOR

       Dominique Dumont

COPYRIGHT AND LICENSE

       This software is Copyright (c) 2005-2018 by Dominique Dumont.

       This is free software, licensed under:

         The GNU Lesser General Public License, Version 2.1, February 1999