Respect\Config

A powerful, small, deadly simple configurator and dependency injection container made to be easy. Featuring:

• INI configuration files only. Simpler than YAML, XML or JSON (see samples below).
• Uses the same native, fast parser that powers php.ini.
• Extends the INI configuration with a custom dialect.
• Implements lazy loading for object instances.

Installation

Please use PEAR. More instructions on the Respect PEAR channel

Autoloading

You can set up Respect\Config for autoloading. We recommend using the SplClassLoader. Here's a nice sample:

set_include_path('/my/library' . PATH_SEPARATOR . get_include_path());
require_once 'SplClassLoader.php';
$respectLoader = new \SplClassLoader();
$respectLoader->register();

Running Tests

We didn't created our tests just for us to apreciate. To run them, you'll need phpunit 3.5 or greater. Then, just chdir into the /tests folder we distribute and run them like this:

cd /my/RespectConfig/tests
phpunit .

You can tweak the phpunit.xml under that /tests folder to your needs.

Feature Guide

Variable Expanding

myconfig.ini:

db_driver = "mysql"
db_host   = "localhost"
db_name   = "my_database"
db_dsn    = "[db_driver]:host=[db_host];dbname=[db_name]"

myapp.php:

$c = new Container('myconfig.ini');
echo $c->db_dsn; //mysql:host=localhost;dbname=my_database

Note that this works only for variables without ini [sections].

Sequences

myconfig.ini:

allowed_users = [foo,bar,baz]

myapp.php:

$c = new Container('myconfig.ini:');
print_r($c->allowed_users); //array('foo', 'bar', 'baz')

Variable expanding also works on sequences. You can express something like this:

myconfig.ini:

admin_user = foo
allowed_users = [[admin_user],bar,baz]

myapp.php:

$c = new Container('myconfig.ini:');
print_r($c->allowed_users); //array('foo', 'bar', 'baz')

Constant Evaluation

myconfig.ini:

error_mode = PDO::ERRMODE_EXCEPTION

Needless to say that this would work on sequences too.

Instances

Using sections

myconfig.ini:

[something stdClass]

myapp.php:

$c = new Container('myconfig.ini:');
echo get_class($c->something); //stdClass

Using names

myconfig.ini:

date DateTime = now

myapp.php:

$c = new Container('myconfig.ini:');
echo get_class($c->something); //DateTime

Callbacks

myconfig.ini:

db_driver = "mysql"
db_host   = "localhost"
db_name   = "my_database"
db_user   = "my_user"
db_pass   = "my_pass"
db_dsn    = "[db_driver]:host=[db_host];dbname=[db_name]"

myapp.php:

$c = new Container('myconfig.ini:');
$c->connection = function() use($c) {
    return new PDO($c->db_dsn, $c->db_user, $c->db_pass);
};
echo get_class($c->connection); //PDO

Instance Passing

myconfig.ini:

[myClass DateTime]

[anotherClass stdClass]
myProperty = [myClass]

myapp.php:

$c = new Container('myconfig.ini:');
echo get_class($c->myClass); //DateTime
echo get_class($c->anotherClass); //stdClass
echo get_class($c->myClass->myProperty); //DateTime

Obviously, this works on sequences too.

Instance Constructor Parameters

Parameter names by reflection:

myconfig.ini:

[connection PDO]
dsn      = "mysql:host=localhost;dbname=my_database"
username = "my_user"
password = "my_pass"

Method call by sequence:

myconfig.ini:

[connection PDO]
__construct = ["mysql:host=localhost;dbname=my_database", "my_user", "my_pass"]

Using Names and Sequences:

myconfig.ini:

connection PDO = ["mysql:host=localhost;dbname=my_database", "my_user", "my_pass"]

Instantiation by Static Factory Methods

myconfig.ini:

[y2k DateTime]
createFromFormat[] = [Y-m-d H:i:s, 2000-01-01 00:00:01]

Instance Method Calls

myconfig.ini:

[connection PDO]
dsn      = "mysql:host=localhost;dbname=my_database"
username = "my_user"
password = "my_pass"
setAttribute = [PDO::ATTR_ERRMODE, PDO::ATTR_EXCEPTION]
exec[]       = "SET NAMES UTF-8"

Instance Properties

myconfig.ini:

[something stdClass]
foo = "bar"

Known Limitations

• Variable expanding only works for unsectioned keys.
• Empty strings, zeros and null are not properly treated yet.
• Constructors with non-null default parameter values may not work properly yet.
• The only way to use magic methods is to call them explicitly with __call
• Circular references haven't been tested and may not work
• May not work properly with the following conditions:
  • Static and normal methods with the same names within the same class
  • Methods and properties with same names within the same class
  • Methods and properties with same names as constructor parameters

Luckly, most of these limitations are known to be PHP bad practices. Keep up the good work and you'll never face them.

License Information

Copyright (c) 2009-2011, Alexandre Gomes Gaigalas. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

• Neither the name of Alexandre Gomes Gaigalas nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.