| 1: | <?php |
| 2: | |
| 3: | declare(strict_types=1); |
| 4: | |
| 5: | /** |
| 6: | * This file is part of the Nexus framework. |
| 7: | * |
| 8: | * (c) John Paul E. Balandan, CPA <paulbalandan@gmail.com> |
| 9: | * |
| 10: | * For the full copyright and license information, please view |
| 11: | * the LICENSE file that was distributed with this source code. |
| 12: | */ |
| 13: | |
| 14: | namespace Nexus\Option; |
| 15: | |
| 16: | /** |
| 17: | * @implements Option<never> |
| 18: | */ |
| 19: | final readonly class None implements Option |
| 20: | { |
| 21: | public function isSome(): bool |
| 22: | { |
| 23: | return false; |
| 24: | } |
| 25: | |
| 26: | public function isSomeAnd(\Closure $predicate): bool |
| 27: | { |
| 28: | return false; |
| 29: | } |
| 30: | |
| 31: | public function isNone(): bool |
| 32: | { |
| 33: | return true; |
| 34: | } |
| 35: | |
| 36: | public function unwrap(): never |
| 37: | { |
| 38: | throw new NoneException(); |
| 39: | } |
| 40: | |
| 41: | /** |
| 42: | * @template S |
| 43: | * |
| 44: | * @param S $default |
| 45: | * |
| 46: | * @return S |
| 47: | */ |
| 48: | public function unwrapOr(mixed $default): mixed |
| 49: | { |
| 50: | return $default; |
| 51: | } |
| 52: | |
| 53: | public function unwrapOrElse(\Closure $default): mixed |
| 54: | { |
| 55: | return $default(); |
| 56: | } |
| 57: | |
| 58: | public function map(\Closure $predicate): self |
| 59: | { |
| 60: | return $this; |
| 61: | } |
| 62: | |
| 63: | /** |
| 64: | * @template U |
| 65: | * @template V |
| 66: | * |
| 67: | * @param V $default |
| 68: | * @param (\Closure(never): U) $predicate |
| 69: | * |
| 70: | * @return V |
| 71: | */ |
| 72: | public function mapOr(mixed $default, \Closure $predicate): mixed |
| 73: | { |
| 74: | return $default; |
| 75: | } |
| 76: | |
| 77: | /** |
| 78: | * @template U |
| 79: | * @template V |
| 80: | * |
| 81: | * @param (\Closure(): V) $default |
| 82: | * @param (\Closure(never): U) $predicate |
| 83: | * |
| 84: | * @return V |
| 85: | */ |
| 86: | public function mapOrElse(\Closure $default, \Closure $predicate): mixed |
| 87: | { |
| 88: | return $default(); |
| 89: | } |
| 90: | |
| 91: | public function and(Option $other): self |
| 92: | { |
| 93: | return $this; |
| 94: | } |
| 95: | |
| 96: | public function andThen(\Closure $predicate): self |
| 97: | { |
| 98: | return $this; |
| 99: | } |
| 100: | |
| 101: | public function filter(\Closure $predicate): self |
| 102: | { |
| 103: | return $this; |
| 104: | } |
| 105: | |
| 106: | public function or(Option $other): Option |
| 107: | { |
| 108: | return $other; |
| 109: | } |
| 110: | |
| 111: | public function orElse(\Closure $other): Option |
| 112: | { |
| 113: | return $other(); |
| 114: | } |
| 115: | |
| 116: | /** |
| 117: | * @template S |
| 118: | * |
| 119: | * @param Option<S> $other |
| 120: | * |
| 121: | * @return ($other is Some<S> ? Some<S> : self<T>) |
| 122: | */ |
| 123: | public function xor(Option $other): Option |
| 124: | { |
| 125: | return $other->isSome() ? $other : $this; |
| 126: | } |
| 127: | |
| 128: | /** |
| 129: | * @return \EmptyIterator |
| 130: | */ |
| 131: | public function getIterator(): \Traversable |
| 132: | { |
| 133: | return new \EmptyIterator(); |
| 134: | } |
| 135: | } |
| 136: |