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<?php
/**
* This file is part of PHPWord - A pure PHP library for reading and writing
* word processing documents.
*
* PHPWord is free software distributed under the terms of the GNU Lesser
* General Public License version 3 as published by the Free Software Foundation.
*
* For the full copyright and license information, please read the LICENSE
* file that was distributed with this source code. For the full list of
* contributors, visit https://github.com/PHPOffice/PHPWord/contributors.
*
* @link https://github.com/PHPOffice/PHPWord
* @copyright 2010-2014 PHPWord contributors
* @license http://www.gnu.org/licenses/lgpl.txt LGPL version 3
*/
namespace PhpOffice\PhpWord\Shared;
/**
* Common string functions
*/
class String
{
/**
* Control characters array
*
* @var string[]
*/
private static $controlCharacters = array();
/**
* Convert from OpenXML escaped control character to PHP control character
*
* @param string $value Value to unescape
* @return string
*/
public static function controlCharacterOOXML2PHP($value = '')
{
if (empty(self::$controlCharacters)) {
self::buildControlCharacters();
}
return str_replace(array_keys(self::$controlCharacters), array_values(self::$controlCharacters), $value);
}
/**
* Convert from PHP control character to OpenXML escaped control character
*
* @param string $value Value to escape
* @return string
*/
public static function controlCharacterPHP2OOXML($value = '')
{
if (empty(self::$controlCharacters)) {
self::buildControlCharacters();
}
return str_replace(array_values(self::$controlCharacters), array_keys(self::$controlCharacters), $value);
}
/**
* Check if a string contains UTF-8 data
*
* @param string $value
* @return boolean
*/
public static function isUTF8($value = '')
{
return $value === '' || preg_match('/^./su', $value) === 1;
}
/**
* Return UTF8 encoded value
*
* @param string $value
* @return string
*/
public static function toUTF8($value = '')
{
if (!is_null($value) && !self::isUTF8($value)) {
$value = utf8_encode($value);
}
return $value;
}
/**
* Returns unicode from UTF8 text
*
* The function is splitted to reduce cyclomatic complexity
*
* @param string $text UTF8 text
* @return string Unicode text
* @since 0.11.0
*/
public static function toUnicode($text)
{
return self::unicodeToEntities(self::utf8ToUnicode($text));
}
/**
* Returns unicode array from UTF8 text
*
* @param string $text UTF8 text
* @return array
* @since 0.11.0
* @link http://www.randomchaos.com/documents/?source=php_and_unicode
*/
private static function utf8ToUnicode($text)
{
$unicode = array();
$values = array();
$lookingFor = 1;
// Gets unicode for each character
for ($i = 0; $i < strlen($text); $i++) {
$thisValue = ord($text[$i]);
if ($thisValue < 128) {
$unicode[] = $thisValue;
} else {
if (count($values) == 0) {
$lookingFor = $thisValue < 224 ? 2 : 3;
}
$values[] = $thisValue;
if (count($values) == $lookingFor) {
if ($lookingFor == 3) {
$number = (($values[0] % 16) * 4096) + (($values[1] % 64) * 64) + ($values[2] % 64);
} else {
$number = (($values[0] % 32) * 64) + ($values[1] % 64);
}
$unicode[] = $number;
$values = array();
$lookingFor = 1;
}
}
}
return $unicode;
}
/**
* Returns entites from unicode array
*
* @param array $unicode
* @return string
* @since 0.11.0
* @link http://www.randomchaos.com/documents/?source=php_and_unicode
*/
private static function unicodeToEntities($unicode)
{
$entities = '';
foreach ($unicode as $value) {
if ($value != 65279) {
$entities .= $value > 127 ? '\uc0{\u' . $value . '}' : chr($value);
}
}
return $entities;
}
/**
* Return name without underscore for < 0.10.0 variable name compatibility
*
* @param string $value
* @return string
*/
public static function removeUnderscorePrefix($value)
{
if (!is_null($value)) {
if (substr($value, 0, 1) == '_') {
$value = substr($value, 1);
}
}
return $value;
}
/**
* Build control characters array.
*
* @return void
*/
private static function buildControlCharacters()
{
for ($i = 0; $i <= 19; ++$i) {
if ($i != 9 && $i != 10 && $i != 13) {
$find = '_x' . sprintf('%04s', strtoupper(dechex($i))) . '_';
$replace = chr($i);
self::$controlCharacters[$find] = $replace;
}
}
}
}