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<?php
declare(strict_types=1);
namespace GrumPHP\Util;
use Symfony\Component\Finder\Glob;
use RuntimeException;
class Regex
{
/**
* A list of all allowed regex modifiers in PHP.
*/
const ALLOWED_MODIFIERS = 'imsxuADU';
/**
* @var string
*/
protected $regex;
/**
* Regex constructor.
*/
public function __construct(string $string)
{
$this->regex = $this->toRegex($string);
}
/**
* Checks whether the string is a regex.
*/
private function isRegex(string $string): bool
{
if (preg_match('/^(.{3,}?)['.self::ALLOWED_MODIFIERS.']*$/', $string, $m)) {
$start = substr($m[1], 0, 1);
$end = substr($m[1], -1);
if ($start === $end) {
return !preg_match('/[*?[:alnum:] \\\\]/', $start);
}
foreach ([['{', '}'], ['(', ')'], ['[', ']'], ['<', '>']] as $delimiters) {
if ($start === $delimiters[0] && $end === $delimiters[1]) {
return true;
}
}
}
return false;
}
private function toRegex(string $string): string
{
return $this->isRegex($string) ? $string : Glob::toRegex($string);
}
public function addPatternModifier(string $modifier): void
{
/** @psalm-suppress InvalidLiteralArgument */
if ('' === $modifier || false === strpos(self::ALLOWED_MODIFIERS, $modifier)) {
throw new RuntimeException('Invalid regex modifier: '.$modifier);
}
// Find all modifiers of current regex:
$modifiersPattern = '/(['.self::ALLOWED_MODIFIERS.']*$)/';
preg_match($modifiersPattern, $this->regex, $matches);
$modifiers = $matches[0];
// Skip if the modifier is already available
if (false !== strpos($modifiers, $modifier)) {
return;
}
$this->regex .= $modifier;
}
/**
* Returns the new regex.
*/
public function __toString(): string
{
return $this->regex;
}
}