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<?php
/**
* Autoloader.
*/
namespace Customind;
defined( 'ABSPATH' ) || exit;
/**
* Class Autoloader.
*
*/
class Autoloader {
/**
* Array containing the registered namespace structures
*
* @var array
*/
protected $namespaces = [];
/**
* Destructor for the Autoloader class.
*
* The destructor automatically unregister the autoload callback function
* with the SPL autoload system.
*/
public function __destruct() {
$this->unregister();
}
/**
* Registers the autoload callback with the SPL autoload system.
*/
public function register() {
spl_autoload_register( [ $this, 'autoload' ] );
}
/**
* Unregister the autoload callback with the SPL autoload system.
*/
public function unregister() {
spl_autoload_unregister( [ $this, 'autoload' ] );
}
/**
* Add a specific namespace structure with our custom autoloader.
*
* @param string $root Root namespace name.
* @param string $base_dir Directory containing the class files.
* @param string $prefix Prefix to be added before the class.
* @param string $suffix Suffix to be added after the class.
* @param boolean $lowercase Whether the class should be changed to
* lowercase.
* @param boolean $underscores Whether the underscores should be changed to
* hyphens.
*
* @return self
*/
public function add_namespace(
$root,
$base_dir,
$prefix = '',
$suffix = '.php',
$lowercase = false,
$underscores = false
) {
$this->namespaces[] = [
'root' => $this->normalize_root( (string) $root ),
'base_dir' => $this->add_trailing_slash( (string) $base_dir ),
'prefix' => (string) $prefix,
'suffix' => (string) $suffix,
'lowercase' => (bool) $lowercase,
'underscores' => (bool) $underscores,
];
return $this;
}
/**
* The autoload function that gets registered with the SPL Autoloader
* system.
*
* @param string $class The class that got requested by the spl_autoloader.
*/
public function autoload( $class ) {
// Iterate over namespaces to find a match.
foreach ( $this->namespaces as $namespace ) {
// Move on if the object does not belong to the current namespace.
if ( 0 !== strpos( $class, $namespace['root'] ) ) {
continue;
}
// Remove namespace root level to correspond with root filesystem, and
// replace the namespace separator "\" by the system-dependent directory separator.
$filename = str_replace(
[ $namespace['root'], '\\' ],
[ '', DIRECTORY_SEPARATOR ],
$class
);
// Remove a leading backslash from the class name.
$filename = $this->remove_leading_backslash( $filename );
// Change to lower case if requested.
if ( $namespace['lowercase'] ) {
$filename = strtolower( $filename );
}
// Change underscores into hyphens if requested.
if ( $namespace['underscores'] ) {
$filename = str_replace( '_', '-', $filename );
}
// Add base_dir, prefix and suffix.
$filepath = $namespace['base_dir']
. $namespace['prefix']
. $filename
. $namespace['suffix'];
// Throw an exception if the file does not exist or is not readable.
if ( is_readable( $filepath ) ) {
require_once $filepath;
}
}
}
/**
* Normalize a namespace root.
*
* @param string $root Namespace root that needs to be normalized.
*
* @return string Normalized namespace root.
*/
protected function normalize_root( $root ) {
$root = $this->remove_leading_backslash( $root );
return $this->add_trailing_backslash( $root );
}
/**
* Remove a leading backslash from a string.
*
* @param string $string String to remove the leading backslash from.
*
* @return string Modified string.
*/
protected function remove_leading_backslash( $string ) {
return ltrim( $string, '\\' );
}
/**
* Make sure a string ends with a trailing backslash.
*
* @param string $string String to check the trailing backslash of.
*
* @return string Modified string.
*/
protected function add_trailing_backslash( $string ) {
return rtrim( $string, '\\' ) . '\\';
}
/**
* Make sure a string ends with a trailing slash.
*
* @param string $string String to check the trailing slash of.
*
* @return string Modified string.
*/
protected function add_trailing_slash( $string ) {
return rtrim( $string, '/\\' ) . '/';
}
}