dtRdr::Hack - self-documenting adaptive finger-wagging global vars

This is a global store for things that cannot otherwise be cleanly solved at the moment.

  package WayOver::OnThe::Left;
  use dtRdr::Hack;  dtRdr::Hack->set_variableB(45);

  package Bottom::Right::Corner;
  use dtRdr::Hack;
  my $variableB = dtRdr::Hack->get_variableB;

Basically, just a way to formalize global variable sharing.

Arrays, hashes, objects, and globs are all passed and stored directly as references.

Variables are declared in the %declarations and %deprecated hashes in the Hack.pm code. To deprecate variables, move them rather than duplicating.

The behavior is controlled by the following constants, which should be similar to perl's warnings and strict pragmas (less the lexical aspects and dynamic switchability.)

  my %declared = (
    some_scalar => '',                       # scalar
    some_array  => [],                       # array
    some_hash   => {},                       # hash
    some_univ   => bless({}, 'UNIVERSAL'),   # any object
    some_obj    => bless({}, 'dtRdr::Book'), # class or subclass
    some_sub    => sub {_die 'ex_sub'},      # declare subs like this
    some_undef  => undef,                    # run-time typing
  );

TODO: you can currently set an object where you declared a hash, but STRICT should probably not allow that.

Moving variables to %deprecated allows you to denote that your code should no longer be using these.

  my %deprecated = (
    some_other_scalar => '',
    some_other_array  => [],
    some_other_hash   => {},
    some_other_sub    => sub {_die 'ex_sub'},
  );

NOTE: The sub {_die 'ex_sub'} idiom lets you stop yourself from calling what you thought was set elsewhere.

STRICT

Throws errors when you:

* get/set to an undeclared variable

* set the wrong type to a variable

* (TODO) set the wrong type to a dynamically typed variable

WARNINGS

Complains when you:

* get/set deprecated variables

* get/set undeclared variables (allowed if STRICT=0)

* get/set the wrong type for a variable (allowed if STRICT=0)

TRACE

Is not implemented yet.

NOTE: Running without STRICT=1 is only lightly tested and is not recommended.

Eric Wilhelm <ewilhelm at cpan dot org>

http://scratchcomputing.com/

See dtRdr

Copyright (C) 2006 OSoft, Eric L. Wilhelm, All Rights Reserved.

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