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<?php |
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namespace SubjectivePHP\Csv; |
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use SplFileObject; |
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/** |
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* Simple class for reading delimited data files |
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*/ |
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class Reader implements \Iterator |
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{ |
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/** |
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* The column headers. |
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* |
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* @var array |
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*/ |
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private $headers; |
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/** |
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* The current file pointer position. |
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* |
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* @var integer |
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*/ |
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private $position = 0; |
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/** |
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* The current row within the csv file. |
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* |
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* @var array|false|null |
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*/ |
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private $current = null; |
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/** |
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* @var SplFileObject |
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*/ |
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private $fileObject; |
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/** |
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* Create a new Reader instance. |
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* |
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* @param string $file The full path to the csv file. |
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* @param HeaderStrategyInterface $headerStrategy Strategy for obtaining headers of the file. |
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* @param CsvOptions $csvOptions Options for the csv file. |
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* |
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* @throws \InvalidArgumentException Thrown if $file is not readable. |
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*/ |
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public function __construct($file, HeaderStrategyInterface $headerStrategy = null, CsvOptions $csvOptions = null) |
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{ |
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if (!is_readable((string)$file)) { |
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throw new \InvalidArgumentException( |
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'$file must be a string containing a full path to a readable delimited file' |
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); |
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} |
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$csvOptions = $csvOptions ?? new CsvOptions(); |
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$headerStrategy = $headerStrategy ?? HeaderStrategy::derive(); |
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$this->fileObject = new SplFileObject($file); |
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$this->fileObject->setFlags(SplFileObject::READ_CSV); |
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$this->fileObject->setCsvControl( |
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$csvOptions->getDelimiter(), |
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$csvOptions->getEnclosure(), |
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$csvOptions->getEscapeChar() |
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); |
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$this->headers = $headerStrategy->getHeaders($this->fileObject); |
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} |
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/** |
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* Advances to the next row in this csv reader |
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* |
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* @return mixed |
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*/ |
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public function next() |
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{ |
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try { |
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$raw = $this->readLine(); |
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if ($this->current !== null) { |
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++$this->position; |
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$this->current = array_combine($this->headers, $raw); |
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} |
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//Headers given, skip first line if header line |
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if ($raw === $this->headers) { |
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$raw = $this->readLine(); |
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} |
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$this->current = array_combine($this->headers, $raw); |
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} catch (\Exception $e) { |
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$this->current = false; |
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return false; |
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} |
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} |
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/** |
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* Helper method to read the next line in the delimited file. |
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* |
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* @return array|false |
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* |
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* @throws \Exception Thrown if no data is returned when reading the file. |
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*/ |
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private function readLine() |
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{ |
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$raw = $this->fileObject->fgetcsv(); |
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if (empty($raw)) { |
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throw new \Exception('Empty line read'); |
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} |
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return $raw; |
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} |
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/** |
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* Return the current element. |
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* |
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* @return array returns array containing values from the current row |
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*/ |
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public function current() |
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{ |
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if ($this->current === null) { |
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$this->next(); |
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} |
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return $this->current; |
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} |
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/** |
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* Return the key of the current element. |
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* |
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* @return integer |
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*/ |
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public function key() |
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{ |
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return $this->position; |
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} |
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/** |
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* Rewind the Iterator to the first element. |
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* |
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* @return void |
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*/ |
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public function rewind() |
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{ |
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$this->fileObject->rewind(); |
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$this->position = 0; |
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$this->current = null; |
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} |
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/** |
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* Check if there is a current element after calls to rewind() or next(). |
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* |
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* @return bool true if there is a current element, false otherwise |
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*/ |
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public function valid() |
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{ |
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if ($this->current === null) { |
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$this->next(); |
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} |
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return !$this->fileObject->eof() && $this->current !== false; |
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} |
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/** |
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* Ensure file handles are closed when all references to this reader are destroyed. |
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* |
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* @return void |
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*/ |
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public function __destruct() |
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{ |
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$this->fileObject = null; |
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} |
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} |
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subjective-php /
csv
