<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Abstract class for the substring transformations plugins
 *
 * @package    PhpMyAdmin-Transformations
 * @subpackage Substring
 */
if (! defined('PHPMYADMIN')) {
    exit;
}

/* Get the transformations interface */
require_once 'libraries/plugins/TransformationsPlugin.class.php';

/**
 * Provides common methods for all of the substring transformations plugins.
 *
 * @package PhpMyAdmin
 */
abstract class SubstringTransformationsPlugin extends TransformationsPlugin
{
    /**
     * Gets the transformation description of the specific plugin
     *
     * @return string
     */
    public static function getInfo()
    {
        return __(
            'Displays a part of a string. The first option is the number of'
            . ' characters to skip from the beginning of the string (Default 0).'
            . ' The second option is the number of characters to return (Default:'
            . ' until end of string). The third option is the string to append'
            . ' and/or prepend when truncation occurs (Default: "…").'
        );
    }

    /**
     * Does the actual work of each specific transformations plugin.
     *
     * @param string $buffer  text to be transformed
     * @param array  $options transformation options
     * @param string $meta    meta information
     *
     * @return string
     */
    public function applyTransformation($buffer, $options = array(), $meta = '')
    {
        // possibly use a global transform and feed it with special options

        // further operations on $buffer using the $options[] array.
        if (!isset($options[0]) ||  $options[0] == '') {
            $options[0] = 0;
        }

        if (!isset($options[1]) ||  $options[1] == '') {
            $options[1] = 'all';
        }

        if (!isset($options[2]) || $options[2] == '') {
            $options[2] = '…';
        }

        $newtext = '';
        if ($options[1] != 'all') {
            $newtext = $GLOBALS['PMA_String']->substr(
                $buffer, $options[0], $options[1]
            );
        } else {
            $newtext = $GLOBALS['PMA_String']->substr($buffer, $options[0]);
        }

        $length = strlen($newtext);
        $baselength = strlen($buffer);
        if ($length != $baselength) {
            if ($options[0] != 0) {
                $newtext = $options[2] . $newtext;
            }

            if (($length + $options[0]) != $baselength) {
                $newtext .= $options[2];
            }
        }

        return htmlspecialchars($newtext);
    }

    /**
     * This method is called when any PluginManager to which the observer
     * is attached calls PluginManager::notify()
     *
     * @param SplSubject $subject The PluginManager notifying the observer
     *                            of an update.
     *
     * @todo implement
     * @return void
     */
    public function update (SplSubject $subject)
    {
        ;
    }


    /* ~~~~~~~~~~~~~~~~~~~~ Getters and Setters ~~~~~~~~~~~~~~~~~~~~ */


    /**
     * Gets the transformation name of the specific plugin
     *
     * @return string
     */
    public static function getName()
    {
        return "Substring";
    }
}
?>
