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<?php |
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namespace PhpSchool\Terminal\IO; |
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use function is_resource; |
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use function get_resource_type; |
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use function stream_get_meta_data; |
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use function strpos; |
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/** |
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* @author Aydin Hassan <[email protected]> |
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*/ |
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class ResourceInputStream implements InputStream |
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{ |
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/** |
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* @var resource |
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*/ |
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private $stream; |
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/** |
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* @var bool Original blocking state. |
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*/ |
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private $blocking; |
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public function __construct($stream = STDIN) |
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{ |
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if (!is_resource($stream) || get_resource_type($stream) !== 'stream') { |
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throw new \InvalidArgumentException('Expected a valid stream'); |
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} |
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$meta = stream_get_meta_data($stream); |
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if (strpos($meta['mode'], 'r') === false && strpos($meta['mode'], '+') === false) { |
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throw new \InvalidArgumentException('Expected a readable stream'); |
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} |
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$meta = stream_get_meta_data($stream); |
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$this->blocking = $meta['blocked']; |
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$this->stream = $stream; |
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} |
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/** |
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* Restore the blocking state. |
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*/ |
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public function __destruct() { |
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stream_set_blocking($this->stream, $this->blocking); |
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} |
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public function read(int $numBytes, callable $callback) : void |
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{ |
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$buffer = fread($this->stream, $numBytes); |
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if (!empty($buffer)) { |
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// Prevent blocking to handle pasted input. |
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stream_set_blocking($this->stream, false); |
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} else { |
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// Re-enable blocking when input has been handled. |
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stream_set_blocking($this->stream, true); |
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} |
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$callback($buffer); |
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} |
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/** |
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* Whether the stream is connected to an interactive terminal |
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*/ |
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public function isInteractive() : bool |
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{ |
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return posix_isatty($this->stream); |
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} |
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} |
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php-school /
terminal
