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<?php declare(strict_types=1);
/**
* @package s9e\RegexpBuilder
* @copyright Copyright (c) 2016-2020 The s9e authors
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
namespace s9e\RegexpBuilder\Output;
abstract class PrintableAscii extends BaseImplementation
{
* @var string 'x' for lowercase hexadecimal symbols, 'X' for uppercase
protected $hexCase;
* {@inheritdoc}
public function __construct(array $options = [])
$this->hexCase = (isset($options['case']) && $options['case'] === 'lower') ? 'x' : 'X';
}
* Escape given ASCII codepoint
*
* @param integer $cp
* @return string
protected function escapeAscii(int $cp): string
return '\\x' . sprintf('%02' . $this->hexCase, $cp);
* Escape given control code
protected function escapeControlCode(int $cp): string
$table = [9 => '\\t', 10 => '\\n', 13 => '\\r'];
return (isset($table[$cp])) ? $table[$cp] : $this->escapeAscii($cp);
* Output the representation of a unicode character
* @param integer $cp Unicode codepoint
abstract protected function escapeUnicode(int $cp): string;
protected function outputValidValue(int $value): string
if ($value < 32)
return $this->escapeControlCode($value);
if ($value < 127)
return chr($value);
return ($value > 255) ? $this->escapeUnicode($value) : $this->escapeAscii($value);