Config::Model::Backend::PerlFile

NAME

Config::Model::Backend::PerlFile - Read and write config as a Perl data structure

VERSION

version 2.152

SYNOPSIS

 use Config::Model ;
 use Data::Dumper ;
 # define configuration tree object
 my $model = Config::Model->new ;
 $model ->create_config_class (
    name => "MyClass",
    element => [
        [qw/foo bar/] => {
            type => 'leaf',
            value_type => 'string'
        },
        baz => {
            type => 'hash',
            index_type => 'string' ,
            cargo => {
                type => 'leaf',
                value_type => 'string',
            },
        },
    ],
  rw_config  => {
     backend => 'perl_file' ,
     config_dir => '/tmp',
     file  => 'foo.pl',
     auto_create => 1,
  },
 ) ;
 my $inst = $model->instance(root_class_name => 'MyClass' );
 my $root = $inst->config_root ;
 my $steps = 'foo=yada bar="bla bla" baz:en=hello
             baz:fr=bonjour baz:hr="dobar dan"';
 $root->load( steps => $steps ) ;
 $inst->write_back ;

Now, "/tmp/foo.pl" contains:

 {
   bar => 'bla bla',
   baz => {
     en => 'hello',
     fr => 'bonjour',
     hr => 'dobar dan'
   },
   foo => 'yada'
 }

DESCRIPTION

This module is used directly by Config::Model to read or write the content of a configuration tree written with Perl syntax in "Config::Model" configuration tree. Note:

•

Undefined values are skipped for list element. I.e. if a list element contains "('a',undef,'b')", the data structure contains 'a','b'.

•

Perl file is not created (and may be deleted) when no data is to be written.

backend parameter

config_dir

Mandoatory parameter to specify where is the Perl configuration file.

CONSTRUCTOR

new

Inherited from Config::Model::Backend::Any. The constructor is called by Config::Model::BackendMgr.

read

Of all parameters passed to this read call-back, only "ifile_path" is used. This parameter must be IO::File object already opened for read. It can also be undef. In which case "read" returns 0. When a file is read, "read" returns 1.

write

Of all parameters passed to this write call-back, only "file_path" is used. This parameter must be a Path::Tiny object. "write" returns 1.

AUTHOR

Dominique Dumont, (ddumont at cpan dot org)

SEE ALSO

Config::Model, Config::Model::BackendMgr, Config::Model::Backend::Any,

AUTHOR

Dominique Dumont

COPYRIGHT AND LICENSE

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