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<?php |
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declare(strict_types=1); |
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namespace Baethon\Phln; |
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use Baethon\Phln\Phln as P; |
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final class RegExp |
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{ |
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/** |
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* @var string |
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*/ |
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private $pattern; |
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/** |
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* @var string |
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*/ |
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private $modifiers; |
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/** |
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* @var bool |
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*/ |
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private $global = false; |
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public function __construct(string $pattern, string $modifiers = '') |
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{ |
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$this->pattern = $this->wrapInDelimiters($pattern); |
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$this->modifiers = str_replace('g', '', $modifiers); |
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$this->global = (false !== strstr($modifiers, 'g')); |
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} |
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public function isGlobal(): bool |
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{ |
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return $this->global; |
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} |
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public function __toString(): string |
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{ |
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return $this->pattern.$this->modifiers; |
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} |
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private function wrapInDelimiters(string $pattern): string |
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{ |
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return $this->hasDelimiters($pattern) ? $pattern : sprintf( |
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'/%s/', |
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preg_quote($pattern, '/') |
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); |
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} |
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/** |
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* Checks if pattern has valid delimiter |
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* |
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* @param string $pattern |
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* @return bool |
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* @see https://secure.php.net/manual/en/regexp.reference.delimiters.php |
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*/ |
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private function hasDelimiters(string $pattern): bool |
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{ |
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if (mb_strlen($pattern) < 2) { |
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return false; |
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} |
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$start = substr($pattern, 0, 1); |
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$end = substr($pattern, -1); |
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if ($start !== $end) { |
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return false; |
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} |
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return static::isValidDelimiter($start) && static::isValidDelimiter($end); |
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} |
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private static function isValidDelimiter(string $char): bool |
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{ |
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return (bool) preg_match('/^[^a-z0-9\s]$/', $char); |
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} |
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/** |
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* Creates RegExp instance based on passed regular expression. |
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* |
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* @param string $regexp |
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* @return RegExp |
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* @example |
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* RegExp::fromString('/foo/gi'); // -> new RegExp('/foo/', 'gi'); |
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*/ |
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public static function fromString(string $regexp): RegExp |
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{ |
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$start = substr($regexp, 0, 1); |
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if (false === static::isValidDelimiter($start)) { |
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return new static($regexp); |
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} |
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$endPosition = strrpos($regexp, $start); |
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$pattern = substr($regexp, 0, $endPosition + 1); |
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$modifiers = substr($regexp, $endPosition + 1); |
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return new static($pattern, $modifiers); |
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} |
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public static function of($regexp): RegExp |
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{ |
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return ($regexp instanceof static) |
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? $regexp |
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: static::fromString($regexp); |
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} |
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public function matchAll(string $test): array |
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{ |
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$matches = []; |
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preg_match_all((string) $this, $test, $matches, PREG_SET_ORDER); |
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$slice = function ($list) { |
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return count($list) > 1 |
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? array_slice($list, 1) |
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: $list; |
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}; |
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return P::flatMap($slice, $matches); |
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} |
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public function test(string $string): bool |
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{ |
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return (bool) preg_match((string) $this, $string); |
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} |
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} |
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baethon /
phln
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