bueltge/wp-rest-api-filter-items

<?php
/**
 * Mapping a namespace structure to a directory structure
 */

namespace Requisite\Rule;
use Requisite\Loader;

class NamespaceDirectoryMapper implements AutoLoadRuleInterface {

    /**
     * @type Loader\FileLoaderInterface
     */
    private $file_loader;

    /**
     * @type string
     */
    private $base_ns;

    /**
     * @type string
     */
    private $base_dir;

    /**
     * @param string $base_dir
     * @param string $base_ns
     * @param Loader\FileLoaderInterface $file_loader $file_loader (Optional)
     */
    function __construct( $base_dir, $base_ns = '', Loader\FileLoaderInterface $file_loader = NULL ) {

        // trim potential trailing slashes
        $this->base_dir = rtrim( (string) $base_dir, '\\/' );

        // always absolute namespaces with trailing slash
        // trim slashes AND spaces
        $base_ns  = trim( $base_ns, '\\ ' );
        if ( ! empty( $base_ns ) )
            $base_ns = '\\' . $base_ns . '\\';
        else
            $base_ns = '\\';
        $this->base_ns = $base_ns;

        if ( ! $file_loader )
            $this->file_loader = new Loader\DirectoryCacheFileLoader( $this->base_dir );
        else
            $this->file_loader = $file_loader;
    }

    /**
     * @param string $class
     * @return bool
     */
    public function loadClass( $class ) {

        //make sure the class name is absolute
        if ( 0 !== strpos( $class, '\\' ) )
            $class = '\\' . $class;

        // check if the namespace matches the class
        if ( 0 !== strpos( $class, $this->base_ns ) )
            return FALSE;

        // strip the base namespace from the beginning of the class name
        if ( $this->base_ns === substr( $class, 0, strlen( $this->base_ns ) ) )
            $class = substr( $class, strlen( $this->base_ns ) );

        $class = ltrim( $class, '\\' );
        $class = str_replace( '\\', '/', $class );
        $file = $this->base_dir . '/' . $class . '.php';

        return $this->file_loader->loadFile( $file );
    }
}