<?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:----NjM0MDcyMzgzNDA3MjA1OCA3OTk1NTA4NDY2MzM4MzkyIDU5ODUyMTcxOTM2NjI5MjE=