Nette，从文本区域中提取数字以执行计算

Question

您好，我有这个问题，我想从 textarea1 获取输入值，例如：第一行的“300pcs, 200$”和“500pcs, 400$”等等，以执行增加基于件数的价格（我曾经有输入并且它有效，但我被告知我需要一个文本区域）。计算结果类似于： textarea2 "300pcs,220$" 和第 2 行 "500pcs, 540$" 增加了适当的百分比。我的问题是，我需要从文本区域的每一行中提取数字来执行计算，但它似乎并没有像想象的那样工作..

declare(strict_types=1);

namespace App\Presenters;


    use App\Forms\FormFactory;
    use Nette\Application\UI\Form;
    use Nette\Database\Context;
    use Nette\Utils\ArrayHash;

class HomepagePresenter extends BasePresenter
{

    /**
     * @var Context
     * @inject
     */
    public $database;

    /**
     * @var FormFactory
     * @inject
     */
    public $formFactory;

    protected function createComponentCalculationForm(): Form
    {
        $form = $this->formFactory->create();

        $form->addSelect('supplier', 'Dodavatel:', $this->database->table('suppliers')->fetchPairs('id', 'supp_name'));

        $form->addTextArea('user_input');

        $form->addSubmit('calculate', 'Spočítat');

        $form->addTextArea('result')
            ->setHtmlAttribute('class', 'totalPrice')
            ->setHtmlAttribute('readonly');

        $form->onSuccess[] = function (Form $form, ArrayHash $values): void {
            $selectedSupp = $values->supplier;
            $userInput = $values->user_input;
            $lines = $array = explode("\n", $userInput);
            foreach ($lines as $line) {
                preg_match_all('/[\d]+/', $line, $numbers);
                list($quantity, $price) = $numbers[0];
            }

            $modifier = $this->database->fetch('SELECT percentage FROM prices WHERE supplier_id = ? AND max >= ? AND min <= ?', $selectedSupp, $quantity, $quantity);
            $total = round($price + ($price / 100) * $modifier->percentage);
            $form['result']->setValue("$quantity Ks, $total Kč + DPH");
        };

        return $form;
    }

}

Answer 1

我的猜测是，您可能想要编写一个边界较少的表达式，例如

(?i)(\d+)\s*pcs\s*[,;]*\s*\$?\s*(\d+(?:\.\d*)?|(?:\.\d+))\s*\$?

如果不是，则问题中的格式相同，

(\d+)pcs,\s(\d+)\$

可能只是工作。

Demo

为了测试，你可能想写一些函数并在循环中调用它来做你想做的事情，比如：

测试

$str = '
300pcs, 200$
301pcs, 201$
301pcs, 201.5$
301.2pcs, 201$
300pcs, 200$
500pcs, 400$
310pcs  ,   220.22$
550  PCS,   540.5$
301pcs     220.$
502 pcs,   .54 $
303  PCS  ;   $220.6
504 pcs,   $540.4
500 pcs,   . $';

function extractPiecesPrices($str)
{
    $re = '/^(\d+)pcs,\s(\d+)\$$/m';
    preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);

    foreach ($matches as $key => $value) {
        if ($value[2] != "") {
            print($value[2] . " is price\n");
            // do some math on prices
        }
        if ($value[1] != "") {
            print($value[1] . " is pcs\n");
            // do some math on pieces
        }
    }

}

extractPiecesPrices($str);

输出

200 is price
300 is pcs
201 is price
301 is pcs
200 is price
300 is pcs
400 is price
500 is pcs