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<?php
namespace Box\Spout\Writer\Common\Helper;
/**
* Class AbstractStyleHelper
* This class provides helper functions to manage styles
*
* @package Box\Spout\Writer\Common\Helper
*/
abstract class AbstractStyleHelper
{
/** @var array [SERIALIZED_STYLE] => [STYLE_ID] mapping table, keeping track of the registered styles */
protected $serializedStyleToStyleIdMappingTable = [];
/** @var array [STYLE_ID] => [STYLE] mapping table, keeping track of the registered styles */
protected $styleIdToStyleMappingTable = [];
/**
* @param \Box\Spout\Writer\Style\Style $defaultStyle
*/
public function __construct($defaultStyle)
{
// This ensures that the default style is the first one to be registered
$this->registerStyle($defaultStyle);
}
/**
* Registers the given style as a used style.
* Duplicate styles won't be registered more than once.
*
* @param \Box\Spout\Writer\Style\Style $style The style to be registered
* @return \Box\Spout\Writer\Style\Style The registered style, updated with an internal ID.
*/
public function registerStyle($style)
{
$serializedStyle = $style->serialize();
if (!$this->hasStyleAlreadyBeenRegistered($style)) {
$nextStyleId = count($this->serializedStyleToStyleIdMappingTable);
$style->setId($nextStyleId);
$this->serializedStyleToStyleIdMappingTable[$serializedStyle] = $nextStyleId;
$this->styleIdToStyleMappingTable[$nextStyleId] = $style;
}
return $this->getStyleFromSerializedStyle($serializedStyle);
}
/**
* Returns whether the given style has already been registered.
*
* @param \Box\Spout\Writer\Style\Style $style
* @return bool
*/
protected function hasStyleAlreadyBeenRegistered($style)
{
$serializedStyle = $style->serialize();
// Using isset here because it is way faster than array_key_exists...
return isset($this->serializedStyleToStyleIdMappingTable[$serializedStyle]);
}
/**
* Returns the registered style associated to the given serialization.
*
* @param string $serializedStyle The serialized style from which the actual style should be fetched from
* @return \Box\Spout\Writer\Style\Style
*/
protected function getStyleFromSerializedStyle($serializedStyle)
{
$styleId = $this->serializedStyleToStyleIdMappingTable[$serializedStyle];
return $this->styleIdToStyleMappingTable[$styleId];
}
/**
* @return \Box\Spout\Writer\Style\Style[] List of registered styles
*/
protected function getRegisteredStyles()
{
return array_values($this->styleIdToStyleMappingTable);
}
/**
* Returns the default style
*
* @return \Box\Spout\Writer\Style\Style Default style
*/
protected function getDefaultStyle()
{
// By construction, the default style has ID 0
return $this->styleIdToStyleMappingTable[0];
}
/**
* Apply additional styles if the given row needs it.
* Typically, set "wrap text" if a cell contains a new line.
*
* @param \Box\Spout\Writer\Style\Style $style The original style
* @param array $dataRow The row the style will be applied to
* @return \Box\Spout\Writer\Style\Style The updated style
*/
public function applyExtraStylesIfNeeded($style, $dataRow)
{
$updatedStyle = $this->applyWrapTextIfCellContainsNewLine($style, $dataRow);
return $updatedStyle;
}
/**
* Set the "wrap text" option if a cell of the given row contains a new line.
*
* @NOTE: There is a bug on the Mac version of Excel (2011 and below) where new lines
* are ignored even when the "wrap text" option is set. This only occurs with
* inline strings (shared strings do work fine).
* A workaround would be to encode "\n" as "_x000D_" but it does not work
* on the Windows version of Excel...
*
* @param \Box\Spout\Writer\Style\Style $style The original style
* @param array $dataRow The row the style will be applied to
* @return \Box\Spout\Writer\Style\Style The eventually updated style
*/
protected function applyWrapTextIfCellContainsNewLine($style, $dataRow)
{
// if the "wrap text" option is already set, no-op
if ($style->hasSetWrapText()) {
return $style;
}
foreach ($dataRow as $cell) {
if (is_string($cell) && strpos($cell, "\n") !== false) {
$style->setShouldWrapText();
break;
}
}
return $style;
}
}