<?php
/**
 * Smarty Config Source Plugin
 *
 * @package    Smarty
 * @subpackage TemplateResources
 * @author     Uwe Tews
 */

/**
 * Smarty Connfig Resource Data Object
 * Meta Data Container for Template Files
 *
 * @package    Smarty
 * @subpackage TemplateResources
 * @author     Uwe Tews
 * @property integer $timestamp Source Timestamp
 * @property boolean $exists    Source Existence
 * @property boolean $template  Extended Template reference
 * @property string $content   Source Content
 */
class Smarty_Template_Config extends Smarty_Template_Source {
    /**
     * Name of the Class to compile this resource's contents with
     *
     * @var string
     */
    public $compiler_class = 'Smarty_Internal_Config_File_Compiler';

    /**
     * Name of the Class to tokenize this resource's contents with
     *
     * @var string
     */
    public $template_lexer_class = 'Smarty_Internal_Configfilelexer';

    /**
     * Name of the Class to parse this resource's contents with
     *
     * @var string
     */
    public $template_parser_class = 'Smarty_Internal_Configfileparser';

    /**
     * array of section names, single section or null
     *
     * @var null|string|array
     */
    public $config_sections = null;

    /**
     * scope into which the config variables shall be loaded
     *
     * @var string
     */
    public $scope = 'local';

    /**
     * Flag that source is a config file
     *
     * @var bool
     */
    public $isConfig = true;

    /**
     * create Source Object container
     *
     * @param Smarty_Resource $handler Resource Handler this source object communicates with
     * @param Smarty $smarty Smarty instance this source object belongs to
     * @param string $resource full template_resource
     * @param string $type type of resource
     * @param string $name resource name
     */
    public function __construct(Smarty_Resource $handler, Smarty $smarty, $resource, $type, $name) {
        $this->handler = clone $handler; // Note: prone to circular references
        $this->resource = $resource;
        $this->type = $type;
        $this->name = $name;
        $this->smarty = $smarty;
    }

    /**
     * initialize Source Object for given resource
     * Either [$_template] or [$smarty, $template_resource] must be specified
     *
     * @param  Smarty_Internal_Template $_template template object
     * @param  Smarty $smarty smarty object
     * @param  string $template_resource resource identifier
     *
     * @return Smarty_Template_Source Source Object
     * @throws SmartyException
     */
    public static function load(Smarty_Internal_Template $_template = null, Smarty $smarty = null, $template_resource = null) {
        static $_incompatible_resources = array('extends' => true, 'php' => true);
        $smarty = $_template->smarty;
        $template_resource = $_template->template_resource;
        if (empty($template_resource)) {
            throw new SmartyException('Missing config name');
        }
        // parse resource_name, load resource handler
        list($name, $type) = Smarty_Resource::parseResourceName($template_resource, $smarty->default_config_type);
        // make sure configs are not loaded via anything smarty can't handle
        if (isset($_incompatible_resources[$type])) {
            throw new SmartyException ("Unable to use resource '{$type}' for config");
        }
        $resource = Smarty_Resource::load($smarty, $type);
        $source = new Smarty_Template_Config($resource, $smarty, $template_resource, $type, $name);
        $resource->populate($source, $_template);
        if ((!isset($source->exists) || !$source->exists) && isset($_template->smarty->default_config_handler_func)) {
            Smarty_Internal_Extension_DefaultTemplateHandler::_getDefault($_template, $source, $resource);
        }
        $source->unique_resource = $resource->buildUniqueResourceName($smarty, $name, true);
        return $source;
    }
}