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<?php |
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declare(strict_types=1); |
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namespace App\Stream; |
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use App\Stream\Data\Converter; |
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use Psr\Http\Message\StreamInterface; |
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final class DataStream implements StreamInterface |
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{ |
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/** @var mixed */ |
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private $data; |
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private bool $readable = false; |
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private ?int $size = null; |
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private bool $rendered = false; |
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private string $buffer = ''; |
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private int $caret = 0; |
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/** @var string|null Class name */ |
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private ?string $converter = null; |
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private array $converterParams = []; |
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public function __construct($body) |
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{ |
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$this->data = $body; |
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} |
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public function __toString(): string |
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{ |
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try { |
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if ($this->isSeekable()) { |
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$this->seek(0); |
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} |
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return $this->getContents(); |
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} catch (\Exception $e) { |
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return ''; |
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} |
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} |
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public function close(): void |
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{ |
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if (isset($this->data)) { |
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$this->detach(); |
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} |
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} |
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public function detach() |
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{ |
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$result = $this->data; |
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unset($this->data); |
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$this->size = null; |
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$this->caret = 0; |
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$this->buffer = ''; |
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$this->rendered = false; |
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$this->readable = false; |
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return $result; |
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} |
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public function getSize(): ?int |
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{ |
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return $this->size; |
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} |
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public function tell(): int |
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{ |
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return $this->caret; |
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} |
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public function eof(): bool |
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{ |
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return $this->data === null || $this->rendered && $this->caret >= $this->size; |
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} |
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public function isSeekable(): bool |
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{ |
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return $this->rendered; |
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} |
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public function seek($offset, $whence = \SEEK_SET): void |
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{ |
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if (!$this->isSeekable()) { |
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throw new \RuntimeException('Stream is not seekable.'); |
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} |
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switch ($whence) { |
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case SEEK_SET: |
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$position = $whence; |
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break; |
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case SEEK_CUR: |
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$position = $this->caret + $whence; |
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break; |
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case SEEK_END: |
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$position = $this->size + $whence; |
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break; |
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default: |
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throw new \InvalidArgumentException('Unsupported whence value.'); |
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} |
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if ($position > $this->size || $position < 0) { |
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throw new \RuntimeException('Impossible offset'); |
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} |
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$this->caret = $position; |
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} |
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public function rewind(): void |
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{ |
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$this->caret = 0; |
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} |
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public function isWritable(): bool |
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{ |
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return false; |
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} |
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public function write($string): int |
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{ |
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if (!$this->isWritable()) { |
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throw new \RuntimeException('Cannot write to a non-writable stream.'); |
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} |
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return 0; |
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} |
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public function isReadable(): bool |
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{ |
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return $this->readable; |
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} |
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public function read($length): string |
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{ |
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if (!$this->isReadable()) { |
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throw new \RuntimeException('Stream should be rendered.'); |
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} |
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if ($this->eof()) { |
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throw new \RuntimeException('Cannot read from ended stream.'); |
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} |
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$result = substr($this->buffer, $this->caret, $length); |
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$this->caret += strlen($result); |
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return $result; |
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} |
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public function getContents(): string |
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{ |
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if (!isset($this->data)) { |
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throw new \RuntimeException('Unable to read stream contents.'); |
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} |
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$content = ''; |
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while (!$this->eof()) { |
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$content .= $this->read(PHP_INT_MAX); |
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} |
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return $content; |
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} |
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public function getMetadata($key = null) |
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{ |
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if (!isset($this->data)) { |
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return $key ? null : []; |
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} |
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$meta = [ |
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'seekable' => $this->isSeekable(), |
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'eof' => $this->eof(), |
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]; |
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if (null === $key) { |
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return $meta; |
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} |
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return $meta[$key] ?? null; |
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} |
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public function getData() |
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{ |
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return $this->data; |
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} |
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public function render(Converter $converter): void |
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{ |
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$this->buffer = $converter->convert($this->data, $this->converterParams); |
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$this->readable = true; |
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$this->rendered = true; |
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$this->caret = 0; |
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$this->size = strlen($this->buffer); |
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} |
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public function setConverter(?string $converter, array $params = []): self |
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{ |
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$this->converter = $converter; |
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$this->converterParams = $params; |
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return $this; |
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} |
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public function getConverter(): ?string |
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{ |
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return $this->converter; |
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} |
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} |
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yiisoft /
yii-demo
