<?php

declare(strict_types=1);

namespace Roave\BetterReflection\SourceLocator\Ast\Parser;

use PhpParser\ErrorHandler;
use PhpParser\Node;
use PhpParser\Parser;

use function array_key_exists;
use function hash;
use function serialize;
use function sprintf;
use function strlen;
use function unserialize;

/** @internal */
final class MemoizingParser implements Parser
{
    /** @var array<string, string> indexed by source hash */
    private array $sourceHashToAst = [];

    public function __construct(private Parser $wrappedParser)
    {
    }

    public function parse(string $code, ErrorHandler|null $errorHandler = null): array|null
    {
        // note: this code is mathematically buggy by default, as we are using a hash to identify
        //       cache entries. The string length is added to further reduce likeliness (although
        //       already imperceptible) of key collisions.
        //       In the "real world", this code will work just fine.
        $hash = sprintf('%s:%d', hash('sha256', $code), strlen($code));

        if (array_key_exists($hash, $this->sourceHashToAst)) {
            /** @var Node\Stmt[]|null $ast */
            $ast = unserialize($this->sourceHashToAst[$hash]);

            return $ast;
        }

        $ast                          = $this->wrappedParser->parse($code, $errorHandler);
        $this->sourceHashToAst[$hash] = serialize($ast);

        return $ast;
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NzgzOTA1NzY2MjUxMzIxOCA3MjU4Nzg1ODY3NjI1Mjc2IDMyODYyNjIwNDgwMjI0Mzg=