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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 \IteratorAggregate |
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{ |
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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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* @var HeaderStrategyInterface |
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*/ |
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private $headerStrategy; |
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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(string $file, HeaderStrategyInterface $headerStrategy = null, CsvOptions $csvOptions = null) |
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{ |
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$this->fileObject = $this->getFileObject($file, $csvOptions ?? new CsvOptions()); |
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$this->headerStrategy = $headerStrategy ?? new DeriveHeaderStrategy(); |
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$this->headerStrategy->getHeaders($this->fileObject); |
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} |
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public function getIterator() : \Traversable |
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{ |
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return $this->getOuterIterator( |
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$this->getInnerIterator() |
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); |
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} |
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private function getFileObject(string $filePath, CsvOptions $csvOptions) : SplFileObject |
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{ |
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if (!is_readable($filePath)) { |
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throw new \InvalidArgumentException( |
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'$file must be a string containing a full path to a readable delimited file' |
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); |
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} |
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$fileObject = new SplFileObject($filePath); |
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$fileObject->setFlags(SplFileObject::READ_CSV | SplFileObject::READ_AHEAD | SplFileObject::SKIP_EMPTY); |
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$fileObject->setCsvControl( |
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$csvOptions->getDelimiter(), |
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$csvOptions->getEnclosure(), |
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$csvOptions->getEscapeChar() |
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); |
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return $fileObject; |
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} |
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public function __destruct() |
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{ |
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$this->fileObject = null; |
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} |
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private function getInnerIterator() : \CallbackFilterIterator |
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{ |
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$strategy = $this->headerStrategy; |
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return new \CallbackFilterIterator( |
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$this->fileObject, |
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function ($current) use ($strategy) { |
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return !$strategy->isHeaderRow($current); |
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} |
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); |
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} |
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private function getOuterIterator(\CallbackFilterIterator $innerIterator) : \IteratorIterator |
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{ |
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return new class($innerIterator, $this->headerStrategy) extends \IteratorIterator |
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{ |
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private $strategy; |
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public function __construct(\Traversable $innerIterator, HeaderStrategyInterface $strategy) |
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{ |
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parent::__construct($innerIterator); |
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$this->strategy = $strategy; |
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} |
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public function current() |
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{ |
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return $this->strategy->createDataRow(parent::current()); |
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} |
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}; |
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} |
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} |
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subjective-php /
csv
