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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\StringWrapper;
use Zend\Stdlib\Exception;
use Zend\Stdlib\StringUtils;
class Native extends AbstractStringWrapper
{
/**
* The character encoding working on
* (overwritten to change default encoding)
*
* @var string
*/
protected $encoding = 'ASCII';
/**
* Check if the given character encoding is supported by this wrapper
* and the character encoding to convert to is also supported.
*
* @param string $encoding
* @param string|null $convertEncoding
* @return bool
*/
public static function isSupported($encoding, $convertEncoding = null)
{
$encodingUpper = strtoupper($encoding);
$supportedEncodings = static::getSupportedEncodings();
if (! in_array($encodingUpper, $supportedEncodings)) {
return false;
}
// This adapter doesn't support to convert between encodings
if ($convertEncoding !== null && $encodingUpper !== strtoupper($convertEncoding)) {
return false;
}
return true;
}
/**
* Get a list of supported character encodings
*
* @return string[]
*/
public static function getSupportedEncodings()
{
return StringUtils::getSingleByteEncodings();
}
/**
* Set character encoding working with and convert to
*
* @param string $encoding The character encoding to work with
* @param string|null $convertEncoding The character encoding to convert to
* @return StringWrapperInterface
*/
public function setEncoding($encoding, $convertEncoding = null)
{
$supportedEncodings = static::getSupportedEncodings();
$encodingUpper = strtoupper($encoding);
if (! in_array($encodingUpper, $supportedEncodings)) {
throw new Exception\InvalidArgumentException(
'Wrapper doesn\'t support character encoding "' . $encoding . '"'
);
}
if ($encodingUpper !== strtoupper($convertEncoding)) {
$this->convertEncoding = $encodingUpper;
}
if ($convertEncoding !== null) {
if ($encodingUpper !== strtoupper($convertEncoding)) {
throw new Exception\InvalidArgumentException(
'Wrapper doesn\'t support to convert between character encodings'
);
}
$this->convertEncoding = $encodingUpper;
} else {
$this->convertEncoding = null;
}
$this->encoding = $encodingUpper;
return $this;
}
/**
* Returns the length of the given string
*
* @param string $str
* @return int|false
*/
public function strlen($str)
{
return strlen($str);
}
/**
* Returns the portion of string specified by the start and length parameters
*
* @param string $str
* @param int $offset
* @param int|null $length
* @return string|false
*/
public function substr($str, $offset = 0, $length = null)
{
return substr($str, $offset, $length);
}
/**
* Find the position of the first occurrence of a substring in a string
*
* @param string $haystack
* @param string $needle
* @param int $offset
* @return int|false
*/
public function strpos($haystack, $needle, $offset = 0)
{
return strpos($haystack, $needle, $offset);
}
}
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