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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celema\Console; |
| 6 | |
| 7 | use BackedEnum; |
| 8 | use ReflectionNamedType; |
| 9 | use ReflectionParameter; |
| 10 | |
| 11 | /** |
| 12 | * The declared type of an `#[Arg]` or `#[Opt]` parameter. |
| 13 | * |
| 14 | * @internal |
| 15 | */ |
| 16 | final class Type |
| 17 | { |
| 18 | private function __construct( |
| 19 | public readonly string $name, |
| 20 | ) {} |
| 21 | |
| 22 | /** |
| 23 | * The parameter's type, or null if it is not a supported one. |
| 24 | */ |
| 25 | public static function of(ReflectionParameter $parameter): ?self |
| 26 | { |
| 27 | $type = $parameter->getType(); |
| 28 | |
| 29 | if (!$type instanceof ReflectionNamedType) { |
| 30 | return null; |
| 31 | } |
| 32 | |
| 33 | $name = $type->getName(); |
| 34 | |
| 35 | return match ($name) { |
| 36 | 'string', 'int', 'float', 'bool', 'array' => new self($name), |
| 37 | default => is_subclass_of($name, BackedEnum::class) ? new self($name) : null, |
| 38 | }; |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Converts a command-line value, or returns null if it does not fit. |
| 43 | * |
| 44 | * Not for `bool`, which takes no value, nor `array`, which collects |
| 45 | * the strings as they are. |
| 46 | */ |
| 47 | public function convert(string $value): string|int|float|BackedEnum|null |
| 48 | { |
| 49 | return match ($this->name) { |
| 50 | 'int' => filter_var($value, FILTER_VALIDATE_INT, FILTER_NULL_ON_FAILURE), |
| 51 | 'float' => filter_var($value, FILTER_VALIDATE_FLOAT, FILTER_NULL_ON_FAILURE), |
| 52 | 'string' => $value, |
| 53 | default => $this->case($value), |
| 54 | }; |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * Describes the values that convert, for error messages. |
| 59 | */ |
| 60 | public function expected(): string |
| 61 | { |
| 62 | return match ($this->name) { |
| 63 | 'int' => 'an integer', |
| 64 | 'float' => 'a number', |
| 65 | default => 'one of ' . implode(', ', $this->choices()), |
| 66 | }; |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * The backing values of an enum type, otherwise none. |
| 71 | * |
| 72 | * @return list<string> |
| 73 | */ |
| 74 | public function choices(): array |
| 75 | { |
| 76 | $enum = $this->name; |
| 77 | |
| 78 | if (!is_subclass_of($enum, BackedEnum::class)) { |
| 79 | return []; |
| 80 | } |
| 81 | |
| 82 | return array_map(static fn(BackedEnum $case): string => (string) $case->value, $enum::cases()); |
| 83 | } |
| 84 | |
| 85 | private function case(string $value): ?BackedEnum |
| 86 | { |
| 87 | /** @var class-string<BackedEnum> $enum */ |
| 88 | $enum = $this->name; |
| 89 | |
| 90 | // Compared as strings: under strict types, tryFrom() rejects the |
| 91 | // string input of an int-backed enum. |
| 92 | foreach ($enum::cases() as $case) { |
| 93 | if ((string) $case->value === $value) { |
| 94 | return $case; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | return null; |
| 99 | } |
| 100 | } |