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| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | /** |
| 4 | * Pop PHP Framework (https://www.popphp.org/) |
| 5 | * |
| 6 | * @link https://github.com/popphp/popphp-framework |
| 7 | * @author Nick Sagona, III <dev@noladev.com> |
| 8 | * @copyright Copyright (c) 2009-2027 NOLA Interactive, LLC. |
| 9 | * @license https://www.popphp.org/license New BSD License |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * @namespace |
| 14 | */ |
| 15 | namespace Pop\Code\Reflection\Support; |
| 16 | |
| 17 | /** |
| 18 | * Namespace import resolver class |
| 19 | * |
| 20 | * Tracks which short class names have already been claimed by a `use`-import within one |
| 21 | * *Reflection::parse() call, and decides -- for each new fully-qualified class name a parent |
| 22 | * class, interface, or attribute needs to reference -- whether it can be imported (and rendered |
| 23 | * by its bare short name) or must be referenced by its fully-qualified name instead, because |
| 24 | * another class with the same short name from a *different* namespace already claimed it. Two |
| 25 | * `use` statements for different classes sharing one short name is a PHP fatal error ("Cannot use |
| 26 | * X as Y because the name is already in use"), so the second one must fall back to its FQCN |
| 27 | * instead of colliding. |
| 28 | * |
| 29 | * One instance is meant to live for the duration of a single *Reflection::parse() call, shared |
| 30 | * across every parent/interface/attribute reference that call detects, so a collision between |
| 31 | * (for example) the parent class's short name and an attribute's short name is caught too, not |
| 32 | * just collisions among attributes alone. |
| 33 | * |
| 34 | * @category Pop |
| 35 | * @package Pop\Code |
| 36 | * @author Nick Sagona, III <dev@noladev.com> |
| 37 | * @copyright Copyright (c) 2009-2027 NOLA Interactive, LLC. |
| 38 | * @license https://www.popphp.org/license New BSD License |
| 39 | * @version 6.0.0 |
| 40 | */ |
| 41 | class NamespaceImportResolver |
| 42 | { |
| 43 | |
| 44 | /** |
| 45 | * Short names already claimed by this resolver, each mapped to the FQCN that claimed it |
| 46 | * @var array |
| 47 | */ |
| 48 | protected array $claimed = []; |
| 49 | |
| 50 | /** |
| 51 | * Resolve a fully-qualified class name into [reference, needsImport] |
| 52 | * |
| 53 | * `$reference` is what should be rendered in place of the class name (a bare short name, or |
| 54 | * a fully-qualified name with a leading backslash). `$needsImport` is whether the caller |
| 55 | * should add a `use $fqcn;` import for it. |
| 56 | * |
| 57 | * @param string $fqcn |
| 58 | * @param string $ownNamespace the namespace of the construct being reflected |
| 59 | * @return array |
| 60 | */ |
| 61 | public function resolve(string $fqcn, string $ownNamespace): array |
| 62 | { |
| 63 | $lastSlash = strrpos($fqcn, '\\'); |
| 64 | |
| 65 | if ($lastSlash === false) { |
| 66 | // A genuinely root-namespace class (no backslash at all) is always unambiguous with |
| 67 | // a leading backslash, regardless of where it's referenced from -- it never needs an |
| 68 | // import and can never collide with one, unlike a namespaced class whose bare short |
| 69 | // name could shadow another import. |
| 70 | return ['\\' . $fqcn, false]; |
| 71 | } |
| 72 | |
| 73 | $namespacePart = substr($fqcn, 0, $lastSlash); |
| 74 | $short = substr($fqcn, $lastSlash + 1); |
| 75 | |
| 76 | if ($namespacePart === $ownNamespace) { |
| 77 | return [$short, false]; |
| 78 | } |
| 79 | |
| 80 | if (isset($this->claimed[$short])) { |
| 81 | return ($this->claimed[$short] === $fqcn) ? [$short, false] : ['\\' . $fqcn, false]; |
| 82 | } |
| 83 | |
| 84 | $this->claimed[$short] = $fqcn; |
| 85 | |
| 86 | return [$short, true]; |
| 87 | } |
| 88 | |
| 89 | } |