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<?php
namespace Box\Spout\Reader\ODS;
use Box\Spout\Common\Exception\IOException;
use Box\Spout\Reader\Exception\IteratorNotRewindableException;
use Box\Spout\Reader\Exception\XMLProcessingException;
use Box\Spout\Reader\IteratorInterface;
use Box\Spout\Reader\ODS\Helper\CellValueFormatter;
use Box\Spout\Reader\Wrapper\XMLReader;
use Box\Spout\Reader\Common\XMLProcessor;
/**
* Class RowIterator
*
* @package Box\Spout\Reader\ODS
*/
class RowIterator implements IteratorInterface
{
/** Definition of XML nodes names used to parse data */
const XML_NODE_TABLE = 'table:table';
const XML_NODE_ROW = 'table:table-row';
const XML_NODE_CELL = 'table:table-cell';
const MAX_COLUMNS_EXCEL = 16384;
/** Definition of XML attribute used to parse data */
const XML_ATTRIBUTE_NUM_ROWS_REPEATED = 'table:number-rows-repeated';
const XML_ATTRIBUTE_NUM_COLUMNS_REPEATED = 'table:number-columns-repeated';
/** @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 bool Whether empty rows should be returned or skipped */
protected $shouldPreserveEmptyRows;
/** @var Helper\CellValueFormatter Helper to format cell values */
protected $cellValueFormatter;
/** @var bool Whether the iterator has already been rewound once */
protected $hasAlreadyBeenRewound = false;
/** @var array Contains the data for the currently processed row (key = cell index, value = cell value) */
protected $currentlyProcessedRowData = [];
/** @var array|null Buffer used to store the row data, while checking if there are more rows to read */
protected $rowDataBuffer = null;
/** @var bool Indicates whether all rows have been read */
protected $hasReachedEndOfFile = false;
/** @var int Last row index processed (one-based) */
protected $lastRowIndexProcessed = 0;
/** @var int Row index to be processed next (one-based) */
protected $nextRowIndexToBeProcessed = 1;
/** @var mixed|null Value of the last processed cell (because when reading cell at column N+1, cell N is processed) */
protected $lastProcessedCellValue = null;
/** @var int Number of times the last processed row should be repeated */
protected $numRowsRepeated = 1;
/** @var int Number of times the last cell value should be copied to the cells on its right */
protected $numColumnsRepeated = 1;
/** @var bool Whether at least one cell has been read for the row currently being processed */
protected $hasAlreadyReadOneCellInCurrentRow = false;
/**
* @param XMLReader $xmlReader XML Reader, positioned on the "<table:table>" element
* @param \Box\Spout\Reader\ODS\ReaderOptions $options Reader's current options
*/
public function __construct($xmlReader, $options)
{
$this->xmlReader = $xmlReader;
$this->shouldPreserveEmptyRows = $options->shouldPreserveEmptyRows();
$this->cellValueFormatter = new CellValueFormatter($options->shouldFormatDates());
// Register all callbacks to process different nodes when reading the XML file
$this->xmlProcessor = new XMLProcessor($this->xmlReader);
$this->xmlProcessor->registerCallback(self::XML_NODE_ROW, XMLProcessor::NODE_TYPE_START, [$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']);
$this->xmlProcessor->registerCallback(self::XML_NODE_TABLE, XMLProcessor::NODE_TYPE_END, [$this, 'processTableEndingNode']);
}
/**
* Rewind the Iterator to the first element.
* NOTE: It can only be done once, as it is not possible to read an XML file backwards.
* @link http://php.net/manual/en/iterator.rewind.php
*
* @return void
* @throws \Box\Spout\Reader\Exception\IteratorNotRewindableException If the iterator is rewound more than once
*/
public function rewind()
{
// Because sheet and row data is located in the file, we can't rewind both the
// sheet iterator and the row iterator, as XML file cannot be read backwards.
// Therefore, rewinding the row iterator has been disabled.
if ($this->hasAlreadyBeenRewound) {
throw new IteratorNotRewindableException();
}
$this->hasAlreadyBeenRewound = true;
$this->lastRowIndexProcessed = 0;
$this->nextRowIndexToBeProcessed = 1;
$this->rowDataBuffer = null;
$this->hasReachedEndOfFile = false;
$this->next();
}
/**
* Checks if current position is valid
* @link http://php.net/manual/en/iterator.valid.php
*
* @return bool
*/
public function valid()
{
return (!$this->hasReachedEndOfFile);
}
/**
* Move forward to next element. Empty rows will be skipped.
* @link http://php.net/manual/en/iterator.next.php
*
* @return void
* @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
*/
public function next()
{
if ($this->doesNeedDataForNextRowToBeProcessed()) {
$this->readDataForNextRow();
}
$this->lastRowIndexProcessed++;
}
/**
* Returns whether we need data for the next row to be processed.
* We DO need to read data if:
* - we have not read any rows yet
* OR
* - the next row to be processed immediately follows the last read row
*
* @return bool Whether we need data for the next row to be processed.
*/
protected function doesNeedDataForNextRowToBeProcessed()
{
$hasReadAtLeastOneRow = ($this->lastRowIndexProcessed !== 0);
return (
!$hasReadAtLeastOneRow ||
$this->lastRowIndexProcessed === $this->nextRowIndexToBeProcessed - 1
);
}
/**
* @return void
* @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
*/
protected function readDataForNextRow()
{
$this->currentlyProcessedRowData = [];
try {
$this->xmlProcessor->readUntilStopped();
} catch (XMLProcessingException $exception) {
throw new IOException("The sheet's data cannot be read. [{$exception->getMessage()}]");
}
$this->rowDataBuffer = $this->currentlyProcessedRowData;
}
/**
* @param \Box\Spout\Reader\Wrapper\XMLReader $xmlReader XMLReader object, positioned on a "<table:table-row>" starting node
* @return int A return code that indicates what action should the processor take next
*/
protected function processRowStartingNode($xmlReader)
{
// Reset data from current row
$this->hasAlreadyReadOneCellInCurrentRow = false;
$this->lastProcessedCellValue = null;
$this->numColumnsRepeated = 1;
$this->numRowsRepeated = $this->getNumRowsRepeatedForCurrentNode($xmlReader);
return XMLProcessor::PROCESSING_CONTINUE;
}
/**
* @param \Box\Spout\Reader\Wrapper\XMLReader $xmlReader XMLReader object, positioned on a "<table:table-cell>" starting node
* @return int A return code that indicates what action should the processor take next
*/
protected function processCellStartingNode($xmlReader)
{
$currentNumColumnsRepeated = $this->getNumColumnsRepeatedForCurrentNode($xmlReader);
// NOTE: expand() will automatically decode all XML entities of the child nodes
$node = $xmlReader->expand();
$currentCellValue = $this->getCellValue($node);
// process cell N only after having read cell N+1 (see below why)
if ($this->hasAlreadyReadOneCellInCurrentRow) {
for ($i = 0; $i < $this->numColumnsRepeated; $i++) {
$this->currentlyProcessedRowData[] = $this->lastProcessedCellValue;
}
}
$this->hasAlreadyReadOneCellInCurrentRow = true;
$this->lastProcessedCellValue = $currentCellValue;
$this->numColumnsRepeated = $currentNumColumnsRepeated;
return XMLProcessor::PROCESSING_CONTINUE;
}
/**
* @return int A return code that indicates what action should the processor take next
*/
protected function processRowEndingNode()
{
$isEmptyRow = $this->isEmptyRow($this->currentlyProcessedRowData, $this->lastProcessedCellValue);
// if the fetched row is empty and we don't want to preserve it...
if (!$this->shouldPreserveEmptyRows && $isEmptyRow) {
// ... skip it
return XMLProcessor::PROCESSING_CONTINUE;
}
// if the row is empty, we don't want to return more than one cell
$actualNumColumnsRepeated = (!$isEmptyRow) ? $this->numColumnsRepeated : 1;
// Only add the value if the last read cell is not a trailing empty cell repeater in Excel.
// The current count of read columns is determined by counting the values in "$this->currentlyProcessedRowData".
// This is to avoid creating a lot of empty cells, as Excel adds a last empty "<table:table-cell>"
// with a number-columns-repeated value equals to the number of (supported columns - used columns).
// In Excel, the number of supported columns is 16384, but we don't want to returns rows with
// always 16384 cells.
if ((count($this->currentlyProcessedRowData) + $actualNumColumnsRepeated) !== self::MAX_COLUMNS_EXCEL) {
for ($i = 0; $i < $actualNumColumnsRepeated; $i++) {
$this->currentlyProcessedRowData[] = $this->lastProcessedCellValue;
}
}
// If we are processing row N and the row is repeated M times,
// then the next row to be processed will be row (N+M).
$this->nextRowIndexToBeProcessed += $this->numRowsRepeated;
// 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 processTableEndingNode()
{
// The closing "</table:table>" marks the end of the file
$this->hasReachedEndOfFile = true;
return XMLProcessor::PROCESSING_STOP;
}
/**
* @param \Box\Spout\Reader\Wrapper\XMLReader $xmlReader XMLReader object, positioned on a "<table:table-row>" starting node
* @return int The value of "table:number-rows-repeated" attribute of the current node, or 1 if attribute missing
*/
protected function getNumRowsRepeatedForCurrentNode($xmlReader)
{
$numRowsRepeated = $xmlReader->getAttribute(self::XML_ATTRIBUTE_NUM_ROWS_REPEATED);
return ($numRowsRepeated !== null) ? intval($numRowsRepeated) : 1;
}
/**
* @param \Box\Spout\Reader\Wrapper\XMLReader $xmlReader XMLReader object, positioned on a "<table:table-cell>" starting node
* @return int The value of "table:number-columns-repeated" attribute of the current node, or 1 if attribute missing
*/
protected function getNumColumnsRepeatedForCurrentNode($xmlReader)
{
$numColumnsRepeated = $xmlReader->getAttribute(self::XML_ATTRIBUTE_NUM_COLUMNS_REPEATED);
return ($numColumnsRepeated !== null) ? intval($numColumnsRepeated) : 1;
}
/**
* Returns the (unescaped) correctly marshalled, cell value associated to the given XML node.
*
* @param \DOMNode $node
* @return string|int|float|bool|\DateTime|\DateInterval|null The value associated with the cell, empty string if cell's type is void/undefined, null on error
*/
protected function getCellValue($node)
{
return $this->cellValueFormatter->extractAndFormatNodeValue($node);
}
/**
* After finishing processing each cell, a row is considered empty if it contains
* no cells or if the value of the last read cell is an empty string.
* After finishing processing each cell, the last read cell is not part of the
* row data yet (as we still need to apply the "num-columns-repeated" attribute).
*
* @param array $rowData
* @param string|int|float|bool|\DateTime|\DateInterval|null The value of the last read cell
* @return bool Whether the row is empty
*/
protected function isEmptyRow($rowData, $lastReadCellValue)
{
return (
count($rowData) === 0 &&
(!isset($lastReadCellValue) || trim($lastReadCellValue) === '')
);
}
/**
* Return the current element, from the buffer.
* @link http://php.net/manual/en/iterator.current.php
*
* @return array|null
*/
public function current()
{
return $this->rowDataBuffer;
}
/**
* Return the key of the current element
* @link http://php.net/manual/en/iterator.key.php
*
* @return int
*/
public function key()
{
return $this->lastRowIndexProcessed;
}
/**
* Cleans up what was created to iterate over the object.
*
* @return void
*/
public function end()
{
$this->xmlReader->close();
}
}