t1gor/Robots.txt-Parser-Class

<?php declare(strict_types=1);

namespace t1gor\RobotsTxtParser\Parser\DirectiveProcessors;

use t1gor\RobotsTxtParser\Directive;

class UserAgentProcessor extends AbstractDirectiveProcessor implements DirectiveProcessorInterface {

    public function getDirectiveName(): string {
        return Directive::USERAGENT;
    }

    public function process(string $line, array & $root, string & $currentUserAgent = '*', string $prevLine = '') {
        $parts = explode(':', $line);
        $newUserAgent = trim($parts[1]);

        if (empty($root) && $newUserAgent === '*') {
            $root[$newUserAgent] = [];
        }

        if ($newUserAgent === $currentUserAgent) {
            $this->log('New useragent is equal to current one, skipping ...');
            return;
        }

        $currentUserAgent = trim($parts[1]);

        if (!isset($root[$currentUserAgent])) {
            $root[$currentUserAgent] = [];
        }

        // if one user-agent is followed by another one - just link them
        if ($this->matches($prevLine)) {
            $prevParts = explode(':', $prevLine);
            $pervLineUserAgent = trim($prevParts[1]);

            $root[$pervLineUserAgent] = & $root[$currentUserAgent];
        }
    }
}