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<?php
/**
* @package s9e\RegexpBuilder
* @copyright Copyright (c) 2016 The s9e Authors
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
namespace s9e\RegexpBuilder\Input;
use InvalidArgumentException;
class Utf8 implements InputInterface
{
* {@inheritdoc}
public function split($string)
if (preg_match_all('(.)us', $string, $matches) === false)
throw new InvalidArgumentException('Invalid UTF-8 string');
}
return $this->charsToCodepoints($matches[0]);
* Convert a list of UTF-8 characters to a list of Unicode codepoint
*
* @param string[] $chars
* @return integer[]
protected function charsToCodepoints(array $chars)
return array_map([$this, 'cp'], $chars);
* Compute and return the Unicode codepoint for given UTF-8 char
* @param string $char UTF-8 char
* @return integer
protected function cp($char)
$cp = ord($char[0]);
if ($cp >= 0xF0)
$cp = ($cp << 18) + (ord($char[1]) << 12) + (ord($char[2]) << 6) + ord($char[3]) - 0x3C82080;
elseif ($cp >= 0xE0)
$cp = ($cp << 12) + (ord($char[1]) << 6) + ord($char[2]) - 0xE2080;
elseif ($cp >= 0xC0)
$cp = ($cp << 6) + ord($char[1]) - 0x3080;
return $cp;
s9e /
RegexpBuilder
