attogram/currency-exchange-rates

<?php
declare(strict_types = 1);

namespace Attogram\Currency\Feeds;

use function explode;
use function mb_convert_encoding;
use function preg_match;
use function str_replace;

final class BankRussia extends Feed implements FeedsInterface
{
    public function transform()
    {
        $this->raw = mb_convert_encoding(
            $this->raw,
            'UTF-8',
            'Windows-1251'
        );
        $this->raw = str_replace('><', ">\n<", $this->raw);
    }

    public function process()
    {
        parent::process();
        $currency = [];
        $date = $target = '';
        foreach ($this->lines as $line) {
            if (preg_match("/Date=\"([[:graph:]]+)\"/", $line, $match)) {
                $date = $match[1];
                $da = explode('.', $date);
                $date = $da[2] . '-' . $da[1] . '-' . $da[0];
                continue;
            }
            if (preg_match("/<CharCode>([[:alpha:]]+)<\/CharCode>/", $line, $match)) {
                $target = $match[1];
                continue;
            }
            if (preg_match("/<Value>([[:graph:]]+)<\/Value>/", $line, $match)) {
                $rate = $match[1];
                $rate = str_replace(',', '.', $rate);
                $rate = (1 / $rate);
                $currency[$target] = $rate;
                $target = false;
            }
        }
        $this->addData($currency, $date, 'RUB', 'BankRussia');
    }
}