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<?php
declare(strict_types=1);
namespace Shirabe\PluginStubGenerator;
use PhpParser\Parser;
use PhpParser\ParserFactory;
/**
* Locates and parses classes of the Composer checkout (composer/src and composer/vendor),
* using the checkout's own PSR-4 autoload map.
*/
final class Project
{
private Parser $parser;
/** @var array<string, list<string>> namespace prefix => base dirs, longest prefix first */
private array $psr4;
/** @var array<string, SourceFile> */
private array $cache = [];
public function __construct(string $composerRoot)
{
$this->parser = (new ParserFactory())->createForNewestSupportedVersion();
$mapFile = $composerRoot . '/vendor/composer/autoload_psr4.php';
if (!is_file($mapFile)) {
throw new GenerationError(["missing $mapFile (run composer install in the checkout)"]);
}
$map = require $mapFile;
$map['Composer\\'] ??= [$composerRoot . '/src/Composer'];
uksort($map, static fn (string $a, string $b): int => strlen($b) <=> strlen($a));
$this->psr4 = $map;
}
public function sourceFor(string $fqcn): SourceFile
{
return $this->cache[$fqcn] ??= new SourceFile($this->fileFor($fqcn), $fqcn, $this->parser);
}
private function fileFor(string $fqcn): string
{
foreach ($this->psr4 as $prefix => $dirs) {
if (!str_starts_with($fqcn, $prefix)) {
continue;
}
$relative = str_replace('\\', '/', substr($fqcn, strlen($prefix))) . '.php';
foreach ($dirs as $dir) {
$path = $dir . '/' . $relative;
if (is_file($path)) {
return $path;
}
}
}
throw new GenerationError(["cannot locate a source file for $fqcn"]);
}
}
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