Object::Declare - Declarative object constructor

       Shlomi Fish <shlomif@cpan.org>

       Audrey Tang <cpan@audreyt.org>

       Please     report     any     bugs     or     feature     requests     on    the    bugtracker    website
       <https://github.com/shlomif/perl-Object-Declare/issues>

       When submitting a bug or request, please include a test-file or a patch to  an  existing  test-file  that
       illustrates the bug or desired feature.

       Copyright 2006, 2007 by Audrey Tang <cpan@audreyt.org>.

       This software is released under the MIT license cited below.

   The"MIT"License
       Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
       associated documentation files (the "Software"), to deal in the Software without restriction, including
       without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
       copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the
       following conditions:

       The above copyright notice and this permission notice shall be included in all copies or substantial
       portions of the Software.

       THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
       LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
       EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
       IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
       THE USE OR OTHER DEALINGS IN THE SOFTWARE.

       This software is Copyright (c) 2006 by Audrey Tang.

       This is free software, licensed under:

         The MIT (X11) License

perl v5.36.0                                       2022-11-19                               Object::Declare(3pm)

       This module exports one function, "declare", for building named objects with a declarative syntax,
       similar to how Jifty::DBI::Schema defines its columns.

       In list context, "declare" returns a list of name/object pairs in the order of declaration (allowing
       duplicates), suitable for putting into a hash.  In scalar context, "declare" returns a hash reference.

       Using a flexible "import" interface, one can change exported helper functions names (declarator), words
       to link labels and values together (copula), and the table of named classes to declare (mapping):

           use Object::Declare
               declarator  => ['declare'],     # list of declarators
               copula      => {                # list of words, or a map
                   is  => '',                  #  from copula to label prefixes,
                   are => '',                  #  or to callback that e.g. turns
                   has => sub { has => @_ },   #  "has X" to "has is X" and
                                               #  "X has 1" to "has is [X => 1]"
               },
               aliases     => {                # list of label aliases:
                   more => 'less',             #  turns "is more" into "is less"
                                               #  and "more is 1" into "less is 1"
               },
               mapping     => {
                   column => 'MyApp::Column',  # class name to call ->new to
                   param  => sub {             # arbitrary coderef also works
                       bless(\@_, 'MyApp::Param');
                   },
               };

       After the declarator block finishes execution, all helper functions are removed from the package.  Same-
       named functions (such as &is and &are) that existed before the declarator's execution are restored
       correctly.

       Object::Declare - Declarative object constructor

       If you export the declarator to another package via @EXPORT, be sure to export all mapping keys as well.
       For example, this will work for the example above:

           our @EXPORT = qw( declare column param );

       But this will not:

           our @EXPORT = qw( declare );

       The copula are not turned into functions, so there is no need to export them.

Websites
       The following websites have more information about this module, and may be of help to you. As always, in
       addition to those websites please use your favorite search engine to discover more resources.

       •   MetaCPAN

           A modern, open-source CPAN search engine, useful to view POD in HTML format.

           <https://metacpan.org/release/Object-Declare>

       •   RT: CPAN's Bug Tracker

           The RT ( Request Tracker ) website is the default bug/issue tracking system for CPAN.

           <https://rt.cpan.org/Public/Dist/Display.html?Name=Object-Declare>

       •   CPANTS

           The CPANTS is a website that analyzes the Kwalitee ( code metrics ) of a distribution.

           <http://cpants.cpanauthors.org/dist/Object-Declare>

       •   CPAN Testers

           The  CPAN  Testers  is  a  network  of  smoke  testers  who  run  automated  tests  on  uploaded CPAN
           distributions.

           <http://www.cpantesters.org/distro/O/Object-Declare>

       •   CPAN Testers Matrix

           The CPAN Testers Matrix is a website that provides a visual  overview  of  the  test  results  for  a
           distribution on various Perls/platforms.

           <http://matrix.cpantesters.org/?dist=Object-Declare>

       •   CPAN Testers Dependencies

           The CPAN Testers Dependencies is a website that shows a chart of the test results of all dependencies
           for a distribution.

           <http://deps.cpantesters.org/?module=Object::Declare>

   Bugs/FeatureRequests
       Please  report  any  bugs or feature requests by email to "bug-object-declare at rt.cpan.org", or through
       the web  interface  at  <https://rt.cpan.org/Public/Bug/Report.html?Queue=Object-Declare>.  You  will  be
       automatically notified of any progress on the request by the system.

   SourceCode
       The  code  is open to the world, and available for you to hack on. Please feel free to browse it and play
       with it, or whatever. If you want to contribute patches, please send me a diff or prod me  to  pull  from
       your repository :)

       <https://github.com/shlomif/perl-Object-Declare>

         git clone git://github.com/shlomif/perl-Object-Declare.git

           use Object::Declare ['MyApp::Column', 'MyApp::Param'];

           my %objects = declare {

           param foo =>
              !is global,
               is immutable,
               valid_values are qw( more values );

           column bar =>
               field1 is 'value',
               field2 is 'some_other_value',
               sub_params are param( is happy ), param ( is sad );

           };

           print $objects{foo}; # a MyApp::Param object
           print $objects{bar}; # a MyApp::Column object

           # Assuming that MyApp::Column::new simply blesses into a hash...
           print $objects{bar}{sub_params}[0]; # a MyApp::Param object
           print $objects{bar}{sub_params}[1]; # a MyApp::Param object

       version 0.25