[ticket/11768] This commit integrates s9e\TextFormatter

This commit integrates s9e\TextFormatter as outlined in
http://area51.phpbb.com/phpBB/viewtopic.php?f=108&t=44467

PHPBB3-11768

phpBB/phpbb/textformatter/utils.php

@@ -0,0 +1,62 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\textformatter;
+
+/**
+* text_formatter.utils service
+*
+* Used to manipulate a parsed text
+*
+* @package phpBB3
+*/
+abstract class utils
+{
+	/**
+	* Replace BBCodes and other formatting elements with whitespace
+	*
+	* NOTE: preserves smilies as text
+	*
+	* @param  string $text
+	* @return string
+	*/
+	abstract public function clean_formatting($text);
+
+	/**
+	* Remove given BBCode at given nesting depth
+	*
+	* @param  string  $text        Parsed text
+	* @param  string  $bbcode_name BBCode's name
+	* @param  integer $depth       Minimum nesting depth (number of parents of the same name)
+	* @return string
+	*/
+	abstract public function remove_bbcode($text, $bbcode_name, $depth = 0);
+
+	/**
+	* Remove BBCodes and other formatting from a parsed text
+	*
+	* NOTE: preserves smilies as text
+	*
+	* @param  string $text
+	* @return string
+	*/
+	abstract public function remove_formatting($text);
+
+	/**
+	* Return a parsed text to its original form
+	*
+	* @param  string $text
+	* @return string
+	*/
+	abstract public function unparse($text);
+}