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

       Dominique Dumont

       This software is Copyright (c) 2005-2022 by Dominique Dumont.

       This is free software, licensed under:

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

perl v5.40.0                                       2024-11-30             Config::Model::...ComputeFunction(3pm)

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

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','-')"

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

        $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(- -)');

       version 2.155