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<?php |
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/** |
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* CSVelte: Slender, elegant CSV for PHP. |
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* |
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* Inspired by Python's CSV module and Frictionless Data and the W3C's CSV |
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* standardization efforts, CSVelte was written in an effort to take all the |
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* suck out of working with CSV. |
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* |
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* @version v0.2 |
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* @copyright Copyright (c) 2016 Luke Visinoni <[email protected]> |
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* @author Luke Visinoni <[email protected]> |
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* @license https://github.com/deni-zen/csvelte/blob/master/LICENSE The MIT License (MIT) |
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*/ |
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namespace CSVelte\IO; |
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use CSVelte\Traits\IsReadable; |
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use CSVelte\Traits\IsWritable; |
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use CSVelte\Traits\IsSeekable; |
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use CSVelte\Contract\Readable; |
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use CSVelte\Contract\Writable; |
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use CSVelte\Contract\Seekable; |
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use \InvalidArgumentException; |
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use CSVelte\Exception\NotYetImplementedException; |
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use CSVelte\Exception\EndOfFileException; |
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use CSVelte\Exception\IOException; |
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/** |
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* CSVelte Stream. |
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* |
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* Represents a stream for input/output. Implements both readable and writable |
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* interfaces so that it can be passed to either ``CSVelte\Reader`` or |
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* ``CSVelte\Writer``. |
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* |
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* @package CSVelte |
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* @subpackage CSVelte\IO |
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* @copyright (c) 2016, Luke Visinoni <[email protected]> |
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* @author Luke Visinoni <[email protected]> |
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* @since v0.2 |
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*/ |
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class Stream implements Readable, Writable, Seekable |
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{ |
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use IsReadable, IsWritable, IsSeekable; |
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/** |
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* Hash of readable/writable stream open mode types. |
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* |
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* Mercilessly stolen from: |
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* https://github.com/guzzle/streams/blob/master/src/Stream.php |
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* |
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* My kudos and sincere thanks go out to Michael Dowling and Graham Campbell |
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* of the guzzle/streams PHP package. Thanks for the inspiration (in some cases) |
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* and the not suing me for outright theft (in this case). |
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* |
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* @var array Hash of readable and writable stream types |
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*/ |
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protected static $readWriteHash = [ |
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'read' => [ |
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'r' => true, 'w+' => true, 'r+' => true, 'x+' => true, 'c+' => true, |
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'rb' => true, 'w+b' => true, 'r+b' => true, 'x+b' => true, |
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'c+b' => true, 'rt' => true, 'w+t' => true, 'r+t' => true, |
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'x+t' => true, 'c+t' => true, 'a+' => true, |
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], |
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'write' => [ |
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'w' => true, 'w+' => true, 'rw' => true, 'r+' => true, 'x+' => true, |
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'c+' => true, 'wb' => true, 'w+b' => true, 'r+b' => true, |
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'x+b' => true, 'c+b' => true, 'w+t' => true, 'r+t' => true, |
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'x+t' => true, 'c+t' => true, 'a' => true, 'a+' => true, |
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], |
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]; |
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/** |
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* @var resource An open stream resource |
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*/ |
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protected $stream; |
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/** |
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* Meta data about stream resource. |
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* Just contains the return value of stream_get_meta_data. |
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* @var array The return value of stream_get_meta_data |
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*/ |
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protected $meta; |
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/** |
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* Is stream seekable |
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* @var boolean True if stream is seekable, false otherwise |
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*/ |
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protected $seekable; |
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/** |
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* Is stream readable |
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* @var boolean True if stream is readable, false otherwise |
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*/ |
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protected $readable; |
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/** |
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* Is stream writable |
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* @var boolean True if stream is writable, false otherwise |
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*/ |
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protected $writable; |
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/** |
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* Converts object/string to a usable stream |
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* |
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* Mercilessly stolen from: |
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* https://github.com/guzzle/streams/blob/master/src/Stream.php |
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* |
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* My kudos and sincere thanks go out to Michael Dowling and Graham Campbell |
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* of the guzzle/streams PHP package. Thanks for the inspiration (in some cases) |
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* and the not suing me for outright theft (in this case). |
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* |
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* @param object|string The string/object to convert to a stream |
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* @param array Options to pass to the newly created stream |
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* @return \CSVelte\IO\Stream |
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* @throws \InvalidArgumentException |
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*/ |
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public static function streamize($resource = '') |
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{ |
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$type = gettype($resource); |
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if ($type == 'string' && file_exists($resource)) { |
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return new self($resource); |
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} |
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if ($type == 'string') { |
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$stream = self::open('php://temp', 'r+'); |
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if ($resource !== '') { |
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fwrite($stream, $resource); |
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fseek($stream, 0); |
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} |
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return new self($stream); |
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} |
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if ($type == 'object' && method_exists($resource, '__toString')) { |
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return self::streamize((string) $resource); |
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} |
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throw new InvalidArgumentException('Invalid resource type: ' . $type); |
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} |
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/** |
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* Stream Object Constructor. |
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* |
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* Instantiates the stream object |
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* |
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* @param string|resource $stream Either a valid stream URI or an open |
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* stream resource (using fopen, fsockopen, et al.) |
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* @param string file/stream open mode as passed to native php |
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* ``fopen`` function |
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* @param array Stream context options array as passed to native php |
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* ``stream_context_create`` function |
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* @see http://php.net/manual/en/function.fopen.php |
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* @see http://php.net/manual/en/function.stream-context-create.php |
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*/ |
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public function __construct($stream, $mode = null, $context = null) |
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{ |
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$this->setMetaData($this->stream = self::open($stream, $mode, $context)); |
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} |
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/** |
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* Stream Object Destructor. |
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* |
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* Closes stream connection. |
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*/ |
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public function __destruct() |
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{ |
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$this->close(); |
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} |
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/** |
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* Open a new stream URI and return stream resource. |
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* |
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* Pass in either a valid stream URI or a stream resource and this will |
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* return a stream resource object. |
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* |
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* @param string|resource $stream Either stream URI or resource object |
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* @param string $mode File/stream open mode (as passed to native php |
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* ``fopen`` function) |
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* @param array $context Stream context options array as passed to native |
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* php ``stream_context_create`` function |
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* @return stream resource object |
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* @throws CSVelte\Exception\IOException on invalid stream uri/resource |
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* @throws \InvalidArgumentException if context param is not an array |
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* @see http://php.net/manual/en/function.fopen.php |
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* @see http://php.net/manual/en/function.stream-context-create.php |
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*/ |
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protected static function open($stream, $mode = null, $context = null) |
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{ |
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if (is_null($mode)) $mode = 'r+b'; |
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if (is_string($uri = $stream)) { |
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if (is_null($context)) { |
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$stream = @fopen($uri, $mode); |
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} else { |
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if (!is_array($context)) { |
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throw new InvalidArgumentException("Invalid argument for context. Expected array, got: " . gettype($context)); |
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} |
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$context = stream_context_create($context); |
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$stream = @fopen($uri, $mode, false, $context); |
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} |
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if (false === $stream) { |
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throw new IOException("Invalid stream URI: " . $uri, IOException::ERR_INVALID_STREAM_URI); |
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} |
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} |
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if (!is_resource($stream) || get_resource_type($stream) != 'stream') { |
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throw new IOException("Expected stream resource, got: " . gettype($stream), IOException::ERR_INVALID_STREAM_RESOURCE); |
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} |
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return $stream; |
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} |
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/** |
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* Close stream resource. |
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* |
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* @return boolean True on success or false on failure |
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*/ |
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public function close() |
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{ |
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if (is_resource($this->stream)) { |
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return fclose($this->stream); |
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} |
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return false; |
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} |
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/** |
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* Set stream meta data via stream resource. |
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* |
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* Pass in stream resource to set this object's stream metadata as returned |
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* by the native php function ``stream_get_meta_data`` |
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* |
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* @param resource $stream Stream resource object |
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* @return $this |
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* @see http://php.net/manual/en/function.stream-get-meta-data.php |
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*/ |
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protected function setMetaData($stream) |
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{ |
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$this->meta = stream_get_meta_data($stream); |
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$this->seekable = (bool) $this->meta['seekable']; |
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$this->readable = isset(self::$readWriteHash['read'][$this->meta['mode']]); |
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$this->writable = isset(self::$readWriteHash['write'][$this->meta['mode']]); |
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return $this; |
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} |
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/** |
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* Get stream metadata (all or certain value). |
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* |
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* Get either the entire stream metadata array or a single value from it by key. |
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* |
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* @param string $key If set, must be one of ``stream_get_meta_data`` array keys |
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* @return string|array Either a single value or whole array returned by ``stream_get_meta_data`` |
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* @see http://php.net/manual/en/function.stream-get-meta-data.php |
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*/ |
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public function getMetaData($key = null) |
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{ |
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if (is_null($key)) return $this->meta; |
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return (array_key_exists($key, $this->meta)) ? $this->meta[$key] : null; |
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} |
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/** |
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* Accessor for seekability. |
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* |
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* Returns true if possible to seek to a certain position within this stream |
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* |
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* @return boolean True if stream is seekable |
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*/ |
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public function isSeekable() |
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{ |
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return $this->seekable; |
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} |
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/** |
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* Accessor for readability. |
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* |
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* Returns true if possible to read from this stream |
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* |
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* @return boolean True if stream is readable |
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*/ |
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public function isReadable() |
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{ |
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return $this->readable; |
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} |
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/** |
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* Accessor for writability. |
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* |
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* Returns true if possible to write to this stream |
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* |
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* @return boolean True if stream is writable |
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*/ |
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public function isWritable() |
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{ |
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return $this->writable; |
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} |
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/** |
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* Accessor for internal stream resource. |
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* |
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* Returns the internal stream resource pointer |
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* |
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* @return resource The open stream resource pointer |
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*/ |
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public function getResource() |
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{ |
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return $this->stream; |
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} |
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/** |
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* Accessor for stream URI. |
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* |
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* Returns the stream URI |
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* |
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* @return string The URI for the stream |
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*/ |
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public function getUri() |
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{ |
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return $this->getMetaData('uri'); |
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} |
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/** |
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* Accessor for stream name. |
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* |
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* Alias for ``getUri()`` |
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* |
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* @return string The name for this stream |
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*/ |
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public function getName() |
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{ |
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return $this->getUri(); |
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} |
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/** |
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* Read $length bytes from stream. |
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* |
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* Reads $length bytes (number of characters) from the stream |
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* |
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* @param int $length Number of bytes to read from stream |
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* @return string|boolean The data read from stream or false if at end of |
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* file or some other problem. |
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* @throws CSVelte\Exception\IOException |
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*/ |
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public function read($length) |
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{ |
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$this->assertIsReadable(); |
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if ($this->eof()) return false; |
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return fread($this->stream, $length); |
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} |
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/** |
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* Read the entire contents of file/stream. |
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* |
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* Read and return the entire contents of the stream. |
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* |
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* @param void |
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* @return string The entire file contents |
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* @throws CSVelte\Exception\IOException |
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*/ |
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public function getContents() |
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{ |
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1 |
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$buffer = ''; |
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1 |
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while ($chunk = $this->read(1024)) { |
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1 |
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$buffer .= $chunk; |
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1 |
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} |
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1 |
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return $buffer; |
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} |
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/** |
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* Is file pointer at the end of the stream? |
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* |
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|
* Returns true if internal pointer has reached the end of the stream. |
368
|
|
|
* |
369
|
|
|
* @return boolean True if end of stream has been reached |
370
|
|
|
*/ |
371
|
29 |
|
public function eof() |
372
|
|
|
{ |
373
|
29 |
|
return feof($this->stream); |
374
|
|
|
} |
375
|
|
|
|
376
|
|
|
/** |
377
|
|
|
* Rewind pointer to beginning of stream. |
378
|
|
|
* |
379
|
|
|
* Rewinds the stream, meaning it returns the pointer to the beginning of the |
380
|
|
|
* stream as if it had just been initialized. |
381
|
|
|
* |
382
|
|
|
* @return boolean True on success |
383
|
|
|
*/ |
384
|
19 |
|
public function rewind() |
385
|
|
|
{ |
386
|
19 |
|
return rewind($this->stream); |
387
|
|
|
} |
388
|
|
|
|
389
|
|
|
/** |
390
|
|
|
* Write to stream |
391
|
|
|
* |
392
|
|
|
* Writes a string to the stream (if it is writable) |
393
|
|
|
* |
394
|
|
|
* @param string $str The data to be written to the stream |
395
|
|
|
* @return int The number of bytes written to the stream |
396
|
|
|
* @throws CSVelte\Exception\IOException |
397
|
|
|
*/ |
398
|
16 |
|
public function write($str) |
399
|
|
|
{ |
400
|
16 |
|
$this->assertIsWritable(); |
401
|
15 |
|
return fwrite($this->stream, $str); |
402
|
|
|
} |
403
|
|
|
|
404
|
|
|
/** |
405
|
|
|
* Seek to position. |
406
|
|
|
* |
407
|
|
|
* Seek to a specific position within the stream (if seekable). |
408
|
|
|
* |
409
|
|
|
* @param int $offset The position to seek to |
410
|
|
|
* @param int $whence One of three native php ``SEEK_`` constants |
411
|
|
|
* @return boolean True on success false on failure |
412
|
|
|
* @throws CSVelte\Exception\IOException |
413
|
|
|
* @see http://php.net/manual/en/function.seek.php |
414
|
|
|
*/ |
415
|
2 |
|
public function seek($offset, $whence = SEEK_SET) |
416
|
|
|
{ |
417
|
2 |
|
$this->assertIsSeekable(); |
418
|
2 |
|
return fseek($this->stream, $offset, $whence) === 0; |
419
|
|
|
} |
420
|
|
|
|
421
|
|
|
} |
422
|
|
|
|