' ', self::TAB => "\t", ]; /** * @var string */ private const SPACE = 'space'; /** * @var string */ private const TAB = 'tab'; /** * @see https://regex101.com/r/A2XiaF/1 * @var string */ private const VALID_INDENT_REGEX = '/^( *|\t+)$/'; /** * @var int */ private const MINIMUM_SIZE = 1; /** * @see https://regex101.com/r/3HFEjX/1 * @var string */ private const PARSE_INDENT_REGEX = '/^(?P( +|\t+)).*/m'; /** * @var string */ private $string; private function __construct(string $string) { $this->string = $string; } public function __toString(): string { return $this->string; } public static function fromString(string $string): self { $validIndent = preg_match(self::VALID_INDENT_REGEX, $string); if ($validIndent !== 1) { throw InvalidIndentStringException::fromString($string); } return new self($string); } public static function createSpaceWithSize(int $size): self { return self::fromSizeAndStyle($size, self::SPACE); } public static function createTabWithSize(int $size): self { return self::fromSizeAndStyle($size, self::TAB); } public static function fromSizeAndStyle(int $size, string $style): self { if ($size < self::MINIMUM_SIZE) { throw InvalidIndentSizeException::fromSizeAndMinimumSize($size, self::MINIMUM_SIZE); } if (! array_key_exists($style, self::CHARACTERS)) { throw InvalidIndentStyleException::fromStyleAndAllowedStyles($style, array_keys(self::CHARACTERS)); } $value = str_repeat(self::CHARACTERS[$style], $size); return new self($value); } public static function fromContent(string $string): self { $validIndent = preg_match(self::PARSE_INDENT_REGEX, $string, $match); if ($validIndent === 1) { return self::fromString($match['indent']); } throw ParseIndentException::fromString($string); } public function getIndentSize(): int { return strlen($this->string); } public function getIndentStyle(): string { return $this->startsWithSpace() ? self::SPACE : self::TAB; } public function getIndentStyleCharacter(): string { return $this->startsWithSpace() ? self::CHARACTERS[self::SPACE] : self::CHARACTERS[self::TAB]; } private function startsWithSpace(): bool { return Strings::startsWith($this->string, ' '); } }