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<?php
/**
* Autoloader
* Modified version of https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader-examples.md
*
* @package WP Grid Builder
* @author Loïc Blascos
* @copyright 2019-2023 Loïc Blascos
*/
namespace WP_Grid_Builder;
// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
/**
* Autoload class.
*
* @class WP_Grid_Builder\Autoload
* @since 1.0.0
*/
class Autoload {
/**
* An associative array where the key is a namespace prefix and the value
* is an array of base directories for classes in that namespace.
*
* @var array
*/
protected $prefixes = [];
/**
* Register loader with SPL autoloader stack.
*
* @return void
*/
public function __construct() {
spl_autoload_register( [ $this, 'load_class' ] );
}
/**
* Adds a base directory for a namespace prefix.
*
* @param string $prefix The namespace prefix.
* @param string $base_dir A base directory for class files in the namespace.
* @param bool $prepend If true, prepend the base directory to the stack
* instead of appending it; this causes it to be searched first rather
* than last.
* @return void
*/
public function add_namespace( $prefix, $base_dir, $prepend = false ) {
// normalize namespace prefix.
$prefix = trim( $prefix, '\\' ) . '\\';
// normalize the base directory with a trailing separator.
$base_dir = rtrim( $base_dir, DIRECTORY_SEPARATOR ) . '/';
// initialize the namespace prefix array.
if ( isset( $this->prefixes[ $prefix ] ) === false ) {
$this->prefixes[ $prefix ] = [];
}
// retain the base directory for the namespace prefix.
if ( $prepend ) {
array_unshift( $this->prefixes[ $prefix ], $base_dir );
} else {
array_push( $this->prefixes[ $prefix ], $base_dir );
}
}
/**
* Loads the class file for a given class name.
*
* @param string $class The fully-qualified class name.
* @return mixed The mapped file name on success, or boolean false on
* failure.
*/
public function load_class( $class ) {
// Add 'class-' prefix to file name.
$class = $this->prefix_file_name( $class );
// the current namespace prefix.
$prefix = $class;
// work backwards through the namespace names of the fully-qualified.
// class name to find a mapped file name.
while ( false !==
$pos = strrpos( $prefix, '\\' ) // phpcs:ignore WordPress.CodeAnalysis.AssignmentInCondition.FoundInWhileCondition
) {
// retain the trailing namespace separator in the prefix.
$prefix = substr( $class, 0, $pos + 1 );
// the rest is the relative class name.
$relative_class = substr( $class, $pos + 1 );
// try to load a mapped file for the prefix and relative class.
$mapped_file = $this->load_mapped_file( $prefix, $relative_class );
if ( $mapped_file ) {
return $mapped_file;
}
// remove the trailing namespace separator for the next iteration of strrpos().
$prefix = rtrim( $prefix, '\\' );
}
// never found a mapped file.
return false;
}
/**
* Make file name compliant with WordPress Coding Standards
*
* @param string $class The fully-qualified class name.
* @return string class The fully-qualified class name prefixed
*/
public function prefix_file_name( $class ) {
if ( stripos( $class, 'interface' ) !== false ) {
return $class;
}
// separate components of the incoming file.
$class = explode( '\\', $class );
// Get length.
$length = count( $class ) - 1;
// Add class prefix to file name.
$class[ $length ] = 'class-' . $class[ $length ];
// recompose fully-qualified class name.
return implode( '\\', $class );
}
/**
* Load the mapped file for a namespace prefix and relative class.
*
* @param string $prefix The namespace prefix.
* @param string $relative_class The relative class name.
* @return mixed Boolean false if no mapped file can be loaded, or the
* name of the mapped file that was loaded.
*/
protected function load_mapped_file( $prefix, $relative_class ) {
// are there any base directories for this namespace prefix?.
if ( isset( $this->prefixes[ $prefix ] ) === false ) {
return false;
}
// look through base directories for this namespace prefix.
foreach ( $this->prefixes[ $prefix ] as $base_dir ) {
// replace the namespace prefix with the base directory.
// replace namespace separators with directory separators.
// in the relative class name, append with .php.
$file = $base_dir . strtolower( str_replace( [ '\\', '_' ], [ '/', '-' ], $relative_class ) ) . '.php';
// if the mapped file exists, require it.
if ( $this->require_file( $file ) ) {
return $file;
}
}
// never found it.
return false;
}
/**
* If a file exists, require it from the file system.
*
* @param string $file The file to require.
* @return bool True if the file exists, false if not.
*/
protected function require_file( $file ) {
if ( ! file_exists( $file ) ) {
return false;
}
require_once $file;
return true;
}
}
// Instantiate the loader.
$loader = new Autoload();
// Register the base directories for the namespace prefix.
$loader->add_namespace( 'WP_Grid_Builder', WPGB_PATH );