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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Stdlib;
use Zend\Stdlib\StringWrapper\StringWrapperInterface;
/**
* Utility class for handling strings of different character encodings
* using available PHP extensions.
*
* Declared abstract, as we have no need for instantiation.
*/
abstract class StringUtils
{
/**
* Ordered list of registered string wrapper instances
*
* @var StringWrapperInterface[]
*/
protected static $wrapperRegistry = null;
/**
* A list of known single-byte character encodings (upper-case)
*
* @var string[]
*/
protected static $singleByteEncodings = [
'ASCII', '7BIT', '8BIT',
'ISO-8859-1', 'ISO-8859-2', 'ISO-8859-3', 'ISO-8859-4', 'ISO-8859-5',
'ISO-8859-6', 'ISO-8859-7', 'ISO-8859-8', 'ISO-8859-9', 'ISO-8859-10',
'ISO-8859-11', 'ISO-8859-13', 'ISO-8859-14', 'ISO-8859-15', 'ISO-8859-16',
'CP-1251', 'CP-1252',
// TODO
];
/**
* Is PCRE compiled with Unicode support?
*
* @var bool
**/
protected static $hasPcreUnicodeSupport = null;
/**
* Get registered wrapper classes
*
* @return string[]
*/
public static function getRegisteredWrappers()
{
if (static::$wrapperRegistry === null) {
static::$wrapperRegistry = [];
if (extension_loaded('intl')) {
static::$wrapperRegistry[] = 'Zend\Stdlib\StringWrapper\Intl';
}
if (extension_loaded('mbstring')) {
static::$wrapperRegistry[] = 'Zend\Stdlib\StringWrapper\MbString';
}
if (extension_loaded('iconv')) {
static::$wrapperRegistry[] = 'Zend\Stdlib\StringWrapper\Iconv';
}
static::$wrapperRegistry[] = 'Zend\Stdlib\StringWrapper\Native';
}
return static::$wrapperRegistry;
}
/**
* Register a string wrapper class
*
* @param string $wrapper
* @return void
*/
public static function registerWrapper($wrapper)
{
$wrapper = (string) $wrapper;
if (! in_array($wrapper, static::$wrapperRegistry, true)) {
static::$wrapperRegistry[] = $wrapper;
}
}
/**
* Unregister a string wrapper class
*
* @param string $wrapper
* @return void
*/
public static function unregisterWrapper($wrapper)
{
$index = array_search((string) $wrapper, static::$wrapperRegistry, true);
if ($index !== false) {
unset(static::$wrapperRegistry[$index]);
}
}
/**
* Reset all registered wrappers so the default wrappers will be used
*
* @return void
*/
public static function resetRegisteredWrappers()
{
static::$wrapperRegistry = null;
}
/**
* Get the first string wrapper supporting the given character encoding
* and supports to convert into the given convert encoding.
*
* @param string $encoding Character encoding to support
* @param string|null $convertEncoding OPTIONAL character encoding to convert in
* @return StringWrapperInterface
* @throws Exception\RuntimeException If no wrapper supports given character encodings
*/
public static function getWrapper($encoding = 'UTF-8', $convertEncoding = null)
{
foreach (static::getRegisteredWrappers() as $wrapperClass) {
if ($wrapperClass::isSupported($encoding, $convertEncoding)) {
$wrapper = new $wrapperClass($encoding, $convertEncoding);
$wrapper->setEncoding($encoding, $convertEncoding);
return $wrapper;
}
}
throw new Exception\RuntimeException(
'No wrapper found supporting "' . $encoding . '"'
. (($convertEncoding !== null) ? ' and "' . $convertEncoding . '"' : '')
);
}
/**
* Get a list of all known single-byte character encodings
*
* @return string[]
*/
public static function getSingleByteEncodings()
{
return static::$singleByteEncodings;
}
/**
* Check if a given encoding is a known single-byte character encoding
*
* @param string $encoding
* @return bool
*/
public static function isSingleByteEncoding($encoding)
{
return in_array(strtoupper($encoding), static::$singleByteEncodings);
}
/**
* Check if a given string is valid UTF-8 encoded
*
* @param string $str
* @return bool
*/
public static function isValidUtf8($str)
{
return is_string($str) && ($str === '' || preg_match('/^./su', $str) == 1);
}
/**
* Is PCRE compiled with Unicode support?
*
* @return bool
*/
public static function hasPcreUnicodeSupport()
{
if (static::$hasPcreUnicodeSupport === null) {
ErrorHandler::start();
static::$hasPcreUnicodeSupport = defined('PREG_BAD_UTF8_OFFSET_ERROR') && preg_match('/\pL/u', 'a') == 1;
ErrorHandler::stop();
}
return static::$hasPcreUnicodeSupport;
}
}
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