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<?php

// File: StorageAccess.php

// Namespace: kch42\ste
namespace kch42\ste;

/*
 * Class: StorageAccess
 * An interface.
 * A StorageAccess implementation is used to access the templates from any storage.
 * This means, that you are not limited to store the Templates inside directories, you can also use a database or something else.
 */
interface StorageAccess
{
    /*
     * Constants: Template modes
     *
     * MODE_SOURCE - The Templates source
     * MODE_TRANSCOMPILED - The transcompiled template
     */
    const MODE_SOURCE        = 0;
    const MODE_TRANSCOMPILED = 1;

    /*
     * Function: load
     * Loading a template.
     *
     * Parameters:
     *  $tpl - The name of the template.
     *  &$mode - Which mode is preferred? One of the <Template modes>.
     *           If <MODE_SOURCE>, the raw sourcecode is expected, if <MODE_TRANSCOMPILED> the transcompiled template *as a callable function* (expecting an <STECore> instance as first parameter) is expected.
     *           If the transcompiled version is not available or older than the source, you can set this parameter to <MODE_SOURCE> and return the source.
     *
     * Throws:
     *  A <CantLoadTemplate> exception if the template could not be loaded.
     *
     * Returns:
     *  Either the sourcecode or a callable function (first, and only parameter: an <STECore> instance).
     */
    public function load($tpl, &$mode);

    /*
     * Function: save
     * Saves a template.
     *
     * Throws:
     *  A <CantSaveTemplate> exception if the template could not be saved.
     *
     * Parameters:
     *  $tpl -The name of the template.
     *  $data - The data to be saved.
     *  $mode - A <Template mode> constant.
     */
    public function save($tpl, $data, $mode);
}