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<?php

class Manifest_Reader
{
    private $version_selector;
    public function __construct($version_selector)
    {
        $this->version_selector = $version_selector;
    }
    public function read_manifests($plugin_paths, $manifest_path, &$path_map)
    {
        $file_paths = array_map(function ($path) use($manifest_path) {
            return trailingslashit($path) . $manifest_path;
        }, $plugin_paths);
        foreach ($file_paths as $path) {
            $this->register_manifest($path, $path_map);
        }
        return $path_map;
    }
    protected function register_manifest($manifest_path, &$path_map)
    {
        if (!is_readable($manifest_path)) {
            return;
        }
        $manifest = (require $manifest_path);
        if (!is_array($manifest)) {
            return;
        }
        foreach ($manifest as $key => $data) {
            $this->register_record($key, $data, $path_map);
        }
    }
    protected function register_record($key, $data, &$path_map)
    {
        if (isset($path_map[$key]['version'])) {
            $selected_version = $path_map[$key]['version'];
        } else {
            $selected_version = null;
        }
        if ($this->version_selector->is_version_update_required($selected_version, $data['version'])) {
            $path_map[$key] = array('version' => $data['version'], 'path' => $data['path']);
        }
    }
}