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<?php
declare(strict_types = 1);
namespace BaconQrCode\Renderer;
use BaconQrCode\Encoder\QrCode;
use BaconQrCode\Exception\InvalidArgumentException;
final class PlainTextRenderer implements RendererInterface
{
/**
* UTF-8 full block (U+2588)
*/
private const FULL_BLOCK = "\xe2\x96\x88";
/**
* UTF-8 upper half block (U+2580)
*/
private const UPPER_HALF_BLOCK = "\xe2\x96\x80";
/**
* UTF-8 lower half block (U+2584)
*/
private const LOWER_HALF_BLOCK = "\xe2\x96\x84";
/**
* UTF-8 no-break space (U+00A0)
*/
private const EMPTY_BLOCK = "\xc2\xa0";
/**
* @var int
*/
private $margin;
public function __construct(int $margin = 2)
{
$this->margin = $margin;
}
/**
* @throws InvalidArgumentException if matrix width doesn't match height
*/
public function render(QrCode $qrCode) : string
{
$matrix = $qrCode->getMatrix();
$matrixSize = $matrix->getWidth();
if ($matrixSize !== $matrix->getHeight()) {
throw new InvalidArgumentException('Matrix must have the same width and height');
}
$rows = $matrix->getArray()->toArray();
if (0 !== $matrixSize % 2) {
$rows[] = array_fill(0, $matrixSize, 0);
}
$horizontalMargin = str_repeat(self::EMPTY_BLOCK, $this->margin);
$result = str_repeat("\n", (int) ceil($this->margin / 2));
for ($i = 0; $i < $matrixSize; $i += 2) {
$result .= $horizontalMargin;
$upperRow = $rows[$i];
$lowerRow = $rows[$i + 1];
for ($j = 0; $j < $matrixSize; ++$j) {
$upperBit = $upperRow[$j];
$lowerBit = $lowerRow[$j];
if ($upperBit) {
$result .= $lowerBit ? self::FULL_BLOCK : self::UPPER_HALF_BLOCK;
} else {
$result .= $lowerBit ? self::LOWER_HALF_BLOCK : self::EMPTY_BLOCK;
}
}
$result .= $horizontalMargin . "\n";
}
$result .= str_repeat("\n", (int) ceil($this->margin / 2));
return $result;
}
}
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