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