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<?php
namespace Box\Spout\Reader\XLSX;
use Box\Spout\Common\Entity\Cell;
use Box\Spout\Common\Entity\Row;
use Box\Spout\Common\Exception\IOException;
use Box\Spout\Reader\Common\Manager\RowManager;
use Box\Spout\Reader\Common\XMLProcessor;
use Box\Spout\Reader\Exception\InvalidValueException;
use Box\Spout\Reader\Exception\XMLProcessingException;
use Box\Spout\Reader\IteratorInterface;
use Box\Spout\Reader\Wrapper\XMLReader;
use Box\Spout\Reader\XLSX\Creator\InternalEntityFactory;
use Box\Spout\Reader\XLSX\Helper\CellHelper;
use Box\Spout\Reader\XLSX\Helper\CellValueFormatter;
/**
* Class RowIterator
*/
class RowIterator implements IteratorInterface
{
/** Definition of XML nodes names used to parse data */
const XML_NODE_DIMENSION = 'dimension';
const XML_NODE_WORKSHEET = 'worksheet';
const XML_NODE_ROW = 'row';
const XML_NODE_CELL = 'c';
/** Definition of XML attributes used to parse data */
const XML_ATTRIBUTE_REF = 'ref';
const XML_ATTRIBUTE_SPANS = 'spans';
const XML_ATTRIBUTE_ROW_INDEX = 'r';
const XML_ATTRIBUTE_CELL_INDEX = 'r';
/** @var string Path of the XLSX file being read */
protected $filePath;
/** @var string Path of the sheet data XML file as in [Content_Types].xml */
protected $sheetDataXMLFilePath;
/** @var \Box\Spout\Reader\Wrapper\XMLReader The XMLReader object that will help read sheet's XML data */
protected $xmlReader;
/** @var \Box\Spout\Reader\Common\XMLProcessor Helper Object to process XML nodes */
protected $xmlProcessor;
/** @var Helper\CellValueFormatter Helper to format cell values */
protected $cellValueFormatter;
/** @var \Box\Spout\Reader\Common\Manager\RowManager Manages rows */
protected $rowManager;
/** @var \Box\Spout\Reader\XLSX\Creator\InternalEntityFactory Factory to create entities */
protected $entityFactory;
/**
* TODO: This variable can be deleted when row indices get preserved
* @var int Number of read rows
*/
protected $numReadRows = 0;
/** @var Row Contains the row currently processed */
protected $currentlyProcessedRow;
/** @var Row|null Buffer used to store the current row, while checking if there are more rows to read */
protected $rowBuffer;
/** @var bool Indicates whether all rows have been read */
protected $hasReachedEndOfFile = false;
/** @var int The number of columns the sheet has (0 meaning undefined) */
protected $numColumns = 0;
/** @var bool Whether empty rows should be returned or skipped */
protected $shouldPreserveEmptyRows;
/** @var int Last row index processed (one-based) */
protected $lastRowIndexProcessed = 0;
/** @var int Row index to be processed next (one-based) */
protected $nextRowIndexToBeProcessed = 0;
/** @var int Last column index processed (zero-based) */
protected $lastColumnIndexProcessed = -1;
/**
* @param string $filePath Path of the XLSX file being read
* @param string $sheetDataXMLFilePath Path of the sheet data XML file as in [Content_Types].xml
* @param bool $shouldPreserveEmptyRows Whether empty rows should be preserved
* @param XMLReader $xmlReader XML Reader
* @param XMLProcessor $xmlProcessor Helper to process XML files
* @param CellValueFormatter $cellValueFormatter Helper to format cell values
* @param RowManager $rowManager Manages rows
* @param InternalEntityFactory $entityFactory Factory to create entities
*/
public function __construct(
$filePath,
$sheetDataXMLFilePath,
$shouldPreserveEmptyRows,
$xmlReader,
XMLProcessor $xmlProcessor,
CellValueFormatter $cellValueFormatter,
RowManager $rowManager,
InternalEntityFactory $entityFactory
) {
$this->filePath = $filePath;
$this->sheetDataXMLFilePath = $this->normalizeSheetDataXMLFilePath($sheetDataXMLFilePath);
$this->shouldPreserveEmptyRows = $shouldPreserveEmptyRows;
$this->xmlReader = $xmlReader;
$this->cellValueFormatter = $cellValueFormatter;
$this->rowManager = $rowManager;
$this->entityFactory = $entityFactory;
// Register all callbacks to process different nodes when reading the XML file
$this->xmlProcessor = $xmlProcessor;
$this->xmlProcessor->registerCallback(self::XML_NODE_DIMENSION, XMLProcessor::NODE_TYPE_START, [$this, 'processDimensionStartingNode']);
$this->xmlProcessor->registerCallback(self::XML_NODE_ROW, XMLProcessor::NODE_TYPE_START, [$this, 'processRowStartingNode']);
$this->xmlProcessor->registerCallback(self::XML_NODE_CELL, XMLProcessor::NODE_TYPE_START, [$this, 'processCellStartingNode']);
$this->xmlProcessor->registerCallback(self::XML_NODE_ROW, XMLProcessor::NODE_TYPE_END, [$this, 'processRowEndingNode']);
$this->xmlProcessor->registerCallback(self::XML_NODE_WORKSHEET, XMLProcessor::NODE_TYPE_END, [$this, 'processWorksheetEndingNode']);
}
/**
* @param string $sheetDataXMLFilePath Path of the sheet data XML file as in [Content_Types].xml
* @return string Path of the XML file containing the sheet data,
* without the leading slash.
*/
protected function normalizeSheetDataXMLFilePath($sheetDataXMLFilePath)
{
return \ltrim($sheetDataXMLFilePath, '/');
}
/**
* Rewind the Iterator to the first element.
* Initializes the XMLReader object that reads the associated sheet data.
* The XMLReader is configured to be safe from billion laughs attack.
* @see http://php.net/manual/en/iterator.rewind.php
*
* @throws \Box\Spout\Common\Exception\IOException If the sheet data XML cannot be read
* @return void
*/
public function rewind()
{
$this->xmlReader->close();
if ($this->xmlReader->openFileInZip($this->filePath, $this->sheetDataXMLFilePath) === false) {
throw new IOException("Could not open \"{$this->sheetDataXMLFilePath}\".");
}
$this->numReadRows = 0;
$this->lastRowIndexProcessed = 0;
$this->nextRowIndexToBeProcessed = 0;
$this->rowBuffer = null;
$this->hasReachedEndOfFile = false;
$this->numColumns = 0;
$this->next();
}
/**
* Checks if current position is valid
* @see http://php.net/manual/en/iterator.valid.php
*
* @return bool
*/
public function valid()
{
return (!$this->hasReachedEndOfFile);
}
/**
* Move forward to next element. Reads data describing the next unprocessed row.
* @see http://php.net/manual/en/iterator.next.php
*
* @throws \Box\Spout\Reader\Exception\SharedStringNotFoundException If a shared string was not found
* @throws \Box\Spout\Common\Exception\IOException If unable to read the sheet data XML
* @return void
*/
public function next()
{
$this->nextRowIndexToBeProcessed++;
if ($this->doesNeedDataForNextRowToBeProcessed()) {
$this->readDataForNextRow();
}
}
/**
* Returns whether we need data for the next row to be processed.
* We don't need to read data if:
* we have already read at least one row
* AND
* we need to preserve empty rows
* AND
* the last row that was read is not the row that need to be processed
* (i.e. if we need to return empty rows)
*
* @return bool Whether we need data for the next row to be processed.
*/
protected function doesNeedDataForNextRowToBeProcessed()
{
$hasReadAtLeastOneRow = ($this->lastRowIndexProcessed !== 0);
return (
!$hasReadAtLeastOneRow ||
!$this->shouldPreserveEmptyRows ||
$this->lastRowIndexProcessed < $this->nextRowIndexToBeProcessed
);
}
/**
* @throws \Box\Spout\Reader\Exception\SharedStringNotFoundException If a shared string was not found
* @throws \Box\Spout\Common\Exception\IOException If unable to read the sheet data XML
* @return void
*/
protected function readDataForNextRow()
{
$this->currentlyProcessedRow = $this->entityFactory->createRow();
try {
$this->xmlProcessor->readUntilStopped();
} catch (XMLProcessingException $exception) {
throw new IOException("The {$this->sheetDataXMLFilePath} file cannot be read. [{$exception->getMessage()}]");
}
$this->rowBuffer = $this->currentlyProcessedRow;
}
/**
* @param \Box\Spout\Reader\Wrapper\XMLReader $xmlReader XMLReader object, positioned on a "<dimension>" starting node
* @return int A return code that indicates what action should the processor take next
*/
protected function processDimensionStartingNode($xmlReader)
{
// Read dimensions of the sheet
$dimensionRef = $xmlReader->getAttribute(self::XML_ATTRIBUTE_REF); // returns 'A1:M13' for instance (or 'A1' for empty sheet)
if (\preg_match('/[A-Z]+\d+:([A-Z]+\d+)/', $dimensionRef, $matches)) {
$this->numColumns = CellHelper::getColumnIndexFromCellIndex($matches[1]) + 1;
}
return XMLProcessor::PROCESSING_CONTINUE;
}
/**
* @param \Box\Spout\Reader\Wrapper\XMLReader $xmlReader XMLReader object, positioned on a "<row>" starting node
* @return int A return code that indicates what action should the processor take next
*/
protected function processRowStartingNode($xmlReader)
{
// Reset index of the last processed column
$this->lastColumnIndexProcessed = -1;
// Mark the last processed row as the one currently being read
$this->lastRowIndexProcessed = $this->getRowIndex($xmlReader);
// Read spans info if present
$numberOfColumnsForRow = $this->numColumns;
$spans = $xmlReader->getAttribute(self::XML_ATTRIBUTE_SPANS); // returns '1:5' for instance
if ($spans) {
list(, $numberOfColumnsForRow) = \explode(':', $spans);
$numberOfColumnsForRow = (int) $numberOfColumnsForRow;
}
$cells = \array_fill(0, $numberOfColumnsForRow, $this->entityFactory->createCell(''));
$this->currentlyProcessedRow->setCells($cells);
return XMLProcessor::PROCESSING_CONTINUE;
}
/**
* @param \Box\Spout\Reader\Wrapper\XMLReader $xmlReader XMLReader object, positioned on a "<cell>" starting node
* @return int A return code that indicates what action should the processor take next
*/
protected function processCellStartingNode($xmlReader)
{
$currentColumnIndex = $this->getColumnIndex($xmlReader);
// NOTE: expand() will automatically decode all XML entities of the child nodes
$node = $xmlReader->expand();
$cell = $this->getCell($node);
$this->currentlyProcessedRow->setCellAtIndex($cell, $currentColumnIndex);
$this->lastColumnIndexProcessed = $currentColumnIndex;
return XMLProcessor::PROCESSING_CONTINUE;
}
/**
* @return int A return code that indicates what action should the processor take next
*/
protected function processRowEndingNode()
{
// if the fetched row is empty and we don't want to preserve it..,
if (!$this->shouldPreserveEmptyRows && $this->rowManager->isEmpty($this->currentlyProcessedRow)) {
// ... skip it
return XMLProcessor::PROCESSING_CONTINUE;
}
$this->numReadRows++;
// If needed, we fill the empty cells
if ($this->numColumns === 0) {
$this->currentlyProcessedRow = $this->rowManager->fillMissingIndexesWithEmptyCells($this->currentlyProcessedRow);
}
// at this point, we have all the data we need for the row
// so that we can populate the buffer
return XMLProcessor::PROCESSING_STOP;
}
/**
* @return int A return code that indicates what action should the processor take next
*/
protected function processWorksheetEndingNode()
{
// The closing "</worksheet>" marks the end of the file
$this->hasReachedEndOfFile = true;
return XMLProcessor::PROCESSING_STOP;
}
/**
* @param \Box\Spout\Reader\Wrapper\XMLReader $xmlReader XMLReader object, positioned on a "<row>" node
* @throws \Box\Spout\Common\Exception\InvalidArgumentException When the given cell index is invalid
* @return int Row index
*/
protected function getRowIndex($xmlReader)
{
// Get "r" attribute if present (from something like <row r="3"...>
$currentRowIndex = $xmlReader->getAttribute(self::XML_ATTRIBUTE_ROW_INDEX);
return ($currentRowIndex !== null) ?
(int) $currentRowIndex :
$this->lastRowIndexProcessed + 1;
}
/**
* @param \Box\Spout\Reader\Wrapper\XMLReader $xmlReader XMLReader object, positioned on a "<c>" node
* @throws \Box\Spout\Common\Exception\InvalidArgumentException When the given cell index is invalid
* @return int Column index
*/
protected function getColumnIndex($xmlReader)
{
// Get "r" attribute if present (from something like <c r="A1"...>
$currentCellIndex = $xmlReader->getAttribute(self::XML_ATTRIBUTE_CELL_INDEX);
return ($currentCellIndex !== null) ?
CellHelper::getColumnIndexFromCellIndex($currentCellIndex) :
$this->lastColumnIndexProcessed + 1;
}
/**
* Returns the cell with (unescaped) correctly marshalled, cell value associated to the given XML node.
*
* @param \DOMNode $node
* @return Cell The cell set with the associated with the cell
*/
protected function getCell($node)
{
try {
$cellValue = $this->cellValueFormatter->extractAndFormatNodeValue($node);
$cell = $this->entityFactory->createCell($cellValue);
} catch (InvalidValueException $exception) {
$cell = $this->entityFactory->createCell($exception->getInvalidValue());
$cell->setType(Cell::TYPE_ERROR);
}
return $cell;
}
/**
* Return the current element, either an empty row or from the buffer.
* @see http://php.net/manual/en/iterator.current.php
*
* @return Row|null
*/
public function current()
{
$rowToBeProcessed = $this->rowBuffer;
if ($this->shouldPreserveEmptyRows) {
// when we need to preserve empty rows, we will either return
// an empty row or the last row read. This depends whether the
// index of last row that was read matches the index of the last
// row whose value should be returned.
if ($this->lastRowIndexProcessed !== $this->nextRowIndexToBeProcessed) {
// return empty row if mismatch between last processed row
// and the row that needs to be returned
$rowToBeProcessed = $this->entityFactory->createRow();
}
}
return $rowToBeProcessed;
}
/**
* Return the key of the current element. Here, the row index.
* @see http://php.net/manual/en/iterator.key.php
*
* @return int
*/
public function key()
{
// TODO: This should return $this->nextRowIndexToBeProcessed
// but to avoid a breaking change, the return value for
// this function has been kept as the number of rows read.
return $this->shouldPreserveEmptyRows ?
$this->nextRowIndexToBeProcessed :
$this->numReadRows;
}
/**
* Cleans up what was created to iterate over the object.
*
* @return void
*/
public function end()
{
$this->xmlReader->close();
}
}
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