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<?php
namespace PhpOffice\PhpSpreadsheet\Worksheet;
use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
use PhpOffice\PhpSpreadsheet\Exception;
use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;
class ColumnIterator implements \Iterator
{
/**
* Worksheet to iterate.
*
* @var Worksheet
*/
private $worksheet;
/**
* Current iterator position.
*
* @var int
*/
private $currentColumnIndex = 1;
/**
* Start position.
*
* @var int
*/
private $startColumnIndex = 1;
/**
* End position.
*
* @var int
*/
private $endColumnIndex = 1;
/**
* Create a new column iterator.
*
* @param Worksheet $worksheet The worksheet to iterate over
* @param string $startColumn The column address at which to start iterating
* @param string $endColumn Optionally, the column address at which to stop iterating
*/
public function __construct(Worksheet $worksheet, $startColumn = 'A', $endColumn = null)
{
// Set subject
$this->worksheet = $worksheet;
$this->resetEnd($endColumn);
$this->resetStart($startColumn);
}
/**
* Destructor.
*/
public function __destruct()
{
unset($this->worksheet);
}
/**
* (Re)Set the start column and the current column pointer.
*
* @param string $startColumn The column address at which to start iterating
*
* @throws Exception
*
* @return $this
*/
public function resetStart($startColumn = 'A')
{
$startColumnIndex = Coordinate::columnIndexFromString($startColumn);
if ($startColumnIndex > Coordinate::columnIndexFromString($this->worksheet->getHighestColumn())) {
throw new Exception("Start column ({$startColumn}) is beyond highest column ({$this->worksheet->getHighestColumn()})");
}
$this->startColumnIndex = $startColumnIndex;
if ($this->endColumnIndex < $this->startColumnIndex) {
$this->endColumnIndex = $this->startColumnIndex;
}
$this->seek($startColumn);
return $this;
}
/**
* (Re)Set the end column.
*
* @param string $endColumn The column address at which to stop iterating
*
* @return $this
*/
public function resetEnd($endColumn = null)
{
$endColumn = $endColumn ? $endColumn : $this->worksheet->getHighestColumn();
$this->endColumnIndex = Coordinate::columnIndexFromString($endColumn);
return $this;
}
/**
* Set the column pointer to the selected column.
*
* @param string $column The column address to set the current pointer at
*
* @throws PhpSpreadsheetException
*
* @return $this
*/
public function seek($column = 'A')
{
$column = Coordinate::columnIndexFromString($column);
if (($column < $this->startColumnIndex) || ($column > $this->endColumnIndex)) {
throw new PhpSpreadsheetException("Column $column is out of range ({$this->startColumnIndex} - {$this->endColumnIndex})");
}
$this->currentColumnIndex = $column;
return $this;
}
/**
* Rewind the iterator to the starting column.
*/
public function rewind()
{
$this->currentColumnIndex = $this->startColumnIndex;
}
/**
* Return the current column in this worksheet.
*
* @return Column
*/
public function current()
{
return new Column($this->worksheet, Coordinate::stringFromColumnIndex($this->currentColumnIndex));
}
/**
* Return the current iterator key.
*
* @return string
*/
public function key()
{
return Coordinate::stringFromColumnIndex($this->currentColumnIndex);
}
/**
* Set the iterator to its next value.
*/
public function next()
{
++$this->currentColumnIndex;
}
/**
* Set the iterator to its previous value.
*/
public function prev()
{
--$this->currentColumnIndex;
}
/**
* Indicate if more columns exist in the worksheet range of columns that we're iterating.
*
* @return bool
*/
public function valid()
{
return $this->currentColumnIndex <= $this->endColumnIndex && $this->currentColumnIndex >= $this->startColumnIndex;
}
}