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<?php |
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/** |
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* This file is part of the PHP Generics package. |
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* |
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* @package Generics |
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*/ |
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namespace Generics\Streams; |
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use Generics\Util\Interpolator; |
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/** |
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* This class provides a memory stream for both input and output |
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* |
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* @author Maik Greubel <[email protected]> |
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*/ |
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class MemoryStream implements InputOutputStream |
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{ |
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use Interpolator { |
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interpolate as tinterpolate; |
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} |
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/** |
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* The local memory buffer |
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* |
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* @var string |
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*/ |
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private $memory; |
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/** |
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* Current position in memory buffer |
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* |
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* @var int |
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*/ |
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private $current; |
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/** |
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* Whether it is possible to perform reading action |
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* |
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* @var boolean |
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*/ |
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private $ready; |
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/** |
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* Whether stream is closed |
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* |
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* @var boolean |
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*/ |
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private $closed; |
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/** |
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* Create a new MemoryStream |
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* |
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* @param InputStream $in |
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* optional existing input stream - will be copied |
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*/ |
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public function __construct(InputStream $in = null) |
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{ |
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$this->memory = ""; |
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if ($in != null) { |
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$copy = clone $in; |
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$copy->reset(); |
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while ($copy->ready()) { |
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$this->memory .= $copy->read(); |
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} |
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$copy->close(); |
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} |
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$this->current = 0; |
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$this->ready = true; |
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$this->closed = false; |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Streams\Stream::close() |
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*/ |
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public function close() |
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{ |
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unset($this->memory); |
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$this->current = 0; |
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$this->ready = false; |
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$this->closed = true; |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Streams\Stream::ready() |
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*/ |
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public function ready(): bool |
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{ |
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return $this->ready; |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Streams\OutputStream::write() |
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*/ |
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public function write($buffer) |
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{ |
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if ($this->closed) { |
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throw new StreamException("Stream is not open"); |
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} |
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$this->memory .= $buffer; |
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$this->ready = true; |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Streams\InputStream::read() |
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*/ |
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public function read($length = 1, $offset = null): string |
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{ |
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if ($this->closed) { |
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throw new StreamException("Stream is not open"); |
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} |
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if ($offset !== null) { |
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$this->current = intval($offset); |
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} |
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if (strlen($this->memory) <= $this->current) { |
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$this->ready = false; |
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return ""; |
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} |
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if (strlen($this->memory) - $this->current < $length) { |
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$length = strlen($this->memory) - $this->current; |
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} |
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$out = substr($this->memory, $this->current, $length); |
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$this->current += $length; |
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if ($this->current == strlen($this->memory)) { |
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$this->ready = false; |
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} |
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return $out; |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Countable::count() |
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*/ |
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public function count(): int |
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{ |
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if ($this->closed) { |
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throw new StreamException("Stream is not open"); |
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} |
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if (! isset($this->memory)) { |
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return 0; |
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} |
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return strlen($this->memory); |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Resettable::reset() |
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*/ |
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public function reset() |
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{ |
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if ($this->closed) { |
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throw new StreamException("Stream is not open"); |
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} |
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$this->current = 0; |
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$this->ready = true; |
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} |
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/** |
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* Write to stream by interpolation of context vars into a string |
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* |
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* @param string $string |
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* The string to interpolate, may contains placeholders in format {placeholder}. |
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* @param array $context |
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* The context array containing the associative replacers and its values. |
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*/ |
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public function interpolate($string, array $context) |
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{ |
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$this->write($this->tinterpolate($string, $context)); |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Streams\OutputStream::isWriteable() |
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*/ |
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public function isWriteable(): bool |
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{ |
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return true; |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Streams\OutputStream::flush() |
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*/ |
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public function flush() |
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{ |
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if ($this->closed) { |
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throw new StreamException("Stream is not open"); |
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} |
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unset($this->memory); |
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$this->memory = ""; |
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$this->reset(); |
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} |
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/** |
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* |
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* {@inheritdoc} |
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* @see \Generics\Streams\Stream::isOpen() |
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*/ |
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public function isOpen(): bool |
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{ |
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return true; |
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} |
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/** |
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* Retrieve the whole memory string content |
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* |
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* @return string |
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*/ |
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public function slurp(): string |
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{ |
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$str = ""; |
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while ($this->ready()) { |
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$str .= $this->read($this->count()); |
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} |
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return $str; |
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} |
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} |
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