axy\syspaths

Specifying paths within the system.

• The library does not require any dependencies (except composer packages).
• Tested on PHP 5.4+, PHP 7, HHVM (on Linux), PHP 5.5 (on Windows).
• Install: composer require axy/syspaths.
• License: MIT.

Documentation

The library allows to store of the directories structure within a certain system. Inside an application for example.

/* App init. __DIR__ is /www/example.loc */
use axy\syspaths\Paths;

$paths = new Paths(__DIR__, [
    'htdocs' => 'www',
    'source' => 'src',
    'templates' => 'templates',
]);

/* Further */

$tplFN = $app->paths->templates.'/default.twig'; // /www/example.loc/templates/default.twig

Define paths in one place makes it easy to change the structure.

API

The library provides a single class axy\syspaths\Paths.

The constructor:

Paths::__construct(string $root [, array $patterns]);

The only required arguments is $root - the root directory of the system.

$patterns

$patterns specifies a list of sub-paths. It can be specified via the constructor (as in the example above). Or by overriding:

/**
 * @property-read string $www
 * @property-read string $templates
 */
class MyPaths extends Paths
{
    protected $patterns = [
        'htdocs' => 'www',
        'templates' => 'templates',
    ];
}

Now available autocomplete in IDE.

Or you can define the property $patterns and also specify the argument of the constructor. In this case these two list recursively merged. For example, define a system class and redefine some paths for tests.

Access to paths

Via magic methods.

$paths->templates; // /www/example.loc/templates
$paths->root; // /www/example.loc

isset($paths->htdocs); // TRUE

$paths->htdocs = 'new-www'; // Exception: Paths is read-only

Patterns

[
    'www' => 'www',
    'images' => ':www:/i',
    'icons' => ':images:/icons',
    'logo' => ':icons:/logo.gif',
    'tmp' => '/tmp',
]

If a path pattern begins with a colon then it is a link to the other path. Such links are processed recursively (circular references are not tracked):

$paths->icons; // /www/example.loc/www/i/icons/logo.gif

If a path pattern begins with / then it is an absolute path:

$paths->tmp; // /tmp

Other patterns is relative to the root. www is equivalent to :root:/www.

Nested paths

[
    'htdocs' => 'www',
    'templates' => [
        'root' => 'templates',
        'layouts' => 'layouts',
        'admin' => ':layouts:/admin',
        'profile' => ':admin:/profile.twig',
    ],
]

An array defines a nested object Paths.

$paths->templates->profile; // /www/example.loc/templates/layouts/admin/profile.twig

For Paths-objects defined __toString():

$paths->templates.'/mails'; // /www/example.loc/templates/mails

The nested array must contains the field root. It may be link: 'root' => ':htdocs:/templates'.

The nested array may contains the field __classname for the class of the nested path. By defaults it is axy\syspaths\Paths.

/**
 * @property-read string $htdocs
 * @property-read TemplatesPaths $templates
 */
class MyPaths extends Paths
{
    $patterns = [
        'htdocs' => 'www',
        'templates' => [
            'root' => 'templates',
            '__classname' => 'TemplatesPaths',
        ],
    ]
}

/**
 * @property-read string $layout
 * @property-read string $admin
 * @property-read string $profile
 */
class TemplatesPaths extends Paths
{
    $patterns = [
        'layouts' => 'layouts',
        'admin' => ':layouts:/admin',
        'profile' => ':admin:/profile.twig',    
    ];
}

Now we have the full auto-complete: $app->paths->templates->profile.

Links can consist of several components:

[
    'templates' => [
        'root' => 'templates',
        'layouts' => 'layouts',
        'admin' => ':layouts:/admin',
    ],
    'profileTemplate' => ':templates.admin:/profile.twig',
]

Creating paths

$paths->templates->layouts.'/tpl.twig';

Or via the method create (or __invoke):

$paths->create(':templates.layouts:/tpl.twig');
$paths(':templates.layouts:/tpl.twig');

Paths::create($pattern, $real = false);

If specified the second argument $real executed realpath() for the result. If the path is not exists then returned NULL.

Exceptions

In the namespace axy\syspaths\errors.

• RequirePatterns - $patterns not defined nor in the property, nor in the constructor.
• PatternNotFound - where access via __get or in a link form other pattern.
• InvalidPattern - not closed link, a nested array is not contains root, __classname in not exists and etc.