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<?php
namespace Box\Spout\Reader\XLSX\Helper;
/**
* Class CellValueFormatter
* This class provides helper functions to format cell values
*
* @package Box\Spout\Reader\XLSX\Helper
*/
class CellValueFormatter
{
/** Definition of all possible cell types */
const CELL_TYPE_INLINE_STRING = 'inlineStr';
const CELL_TYPE_STR = 'str';
const CELL_TYPE_SHARED_STRING = 's';
const CELL_TYPE_BOOLEAN = 'b';
const CELL_TYPE_NUMERIC = 'n';
const CELL_TYPE_DATE = 'd';
const CELL_TYPE_ERROR = 'e';
/** Definition of XML nodes names used to parse data */
const XML_NODE_VALUE = 'v';
const XML_NODE_INLINE_STRING_VALUE = 't';
/** Definition of XML attributes used to parse data */
const XML_ATTRIBUTE_TYPE = 't';
const XML_ATTRIBUTE_STYLE_ID = 's';
/** Constants used for date formatting */
const NUM_SECONDS_IN_ONE_DAY = 86400;
const NUM_SECONDS_IN_ONE_HOUR = 3600;
const NUM_SECONDS_IN_ONE_MINUTE = 60;
/**
* February 29th, 1900 is NOT a leap year but Excel thinks it is...
* @see https://en.wikipedia.org/wiki/Year_1900_problem#Microsoft_Excel
*/
const ERRONEOUS_EXCEL_LEAP_YEAR_DAY = 60;
/** @var SharedStringsHelper Helper to work with shared strings */
protected $sharedStringsHelper;
/** @var StyleHelper Helper to work with styles */
protected $styleHelper;
/** @var bool Whether date/time values should be returned as PHP objects or be formatted as strings */
protected $shouldFormatDates;
/** @var \Box\Spout\Common\Escaper\XLSX Used to unescape XML data */
protected $escaper;
/**
* @param SharedStringsHelper $sharedStringsHelper Helper to work with shared strings
* @param StyleHelper $styleHelper Helper to work with styles
* @param bool $shouldFormatDates Whether date/time values should be returned as PHP objects or be formatted as strings
*/
public function __construct($sharedStringsHelper, $styleHelper, $shouldFormatDates)
{
$this->sharedStringsHelper = $sharedStringsHelper;
$this->styleHelper = $styleHelper;
$this->shouldFormatDates = $shouldFormatDates;
/** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
$this->escaper = \Box\Spout\Common\Escaper\XLSX::getInstance();
}
/**
* Returns the (unescaped) correctly marshalled, cell value associated to the given XML node.
*
* @param \DOMNode $node
* @return string|int|float|bool|\DateTime|null The value associated with the cell (null when the cell has an error)
*/
public function extractAndFormatNodeValue($node)
{
// Default cell type is "n"
$cellType = $node->getAttribute(self::XML_ATTRIBUTE_TYPE) ?: self::CELL_TYPE_NUMERIC;
$cellStyleId = intval($node->getAttribute(self::XML_ATTRIBUTE_STYLE_ID));
$vNodeValue = $this->getVNodeValue($node);
if (($vNodeValue === '') && ($cellType !== self::CELL_TYPE_INLINE_STRING)) {
return $vNodeValue;
}
switch ($cellType) {
case self::CELL_TYPE_INLINE_STRING:
return $this->formatInlineStringCellValue($node);
case self::CELL_TYPE_SHARED_STRING:
return $this->formatSharedStringCellValue($vNodeValue);
case self::CELL_TYPE_STR:
return $this->formatStrCellValue($vNodeValue);
case self::CELL_TYPE_BOOLEAN:
return $this->formatBooleanCellValue($vNodeValue);
case self::CELL_TYPE_NUMERIC:
return $this->formatNumericCellValue($vNodeValue, $cellStyleId);
case self::CELL_TYPE_DATE:
return $this->formatDateCellValue($vNodeValue);
default:
return null;
}
}
/**
* Returns the cell's string value from a node's nested value node
*
* @param \DOMNode $node
* @return string The value associated with the cell
*/
protected function getVNodeValue($node)
{
// for cell types having a "v" tag containing the value.
// if not, the returned value should be empty string.
$vNode = $node->getElementsByTagName(self::XML_NODE_VALUE)->item(0);
return ($vNode !== null) ? $vNode->nodeValue : '';
}
/**
* Returns the cell String value where string is inline.
*
* @param \DOMNode $node
* @return string The value associated with the cell (null when the cell has an error)
*/
protected function formatInlineStringCellValue($node)
{
// inline strings are formatted this way:
// <c r="A1" t="inlineStr"><is><t>[INLINE_STRING]</t></is></c>
$tNode = $node->getElementsByTagName(self::XML_NODE_INLINE_STRING_VALUE)->item(0);
$cellValue = $this->escaper->unescape($tNode->nodeValue);
return $cellValue;
}
/**
* Returns the cell String value from shared-strings file using nodeValue index.
*
* @param string $nodeValue
* @return string The value associated with the cell (null when the cell has an error)
*/
protected function formatSharedStringCellValue($nodeValue)
{
// shared strings are formatted this way:
// <c r="A1" t="s"><v>[SHARED_STRING_INDEX]</v></c>
$sharedStringIndex = intval($nodeValue);
$escapedCellValue = $this->sharedStringsHelper->getStringAtIndex($sharedStringIndex);
$cellValue = $this->escaper->unescape($escapedCellValue);
return $cellValue;
}
/**
* Returns the cell String value, where string is stored in value node.
*
* @param string $nodeValue
* @return string The value associated with the cell (null when the cell has an error)
*/
protected function formatStrCellValue($nodeValue)
{
$escapedCellValue = trim($nodeValue);
$cellValue = $this->escaper->unescape($escapedCellValue);
return $cellValue;
}
/**
* Returns the cell Numeric value from string of nodeValue.
* The value can also represent a timestamp and a DateTime will be returned.
*
* @param string $nodeValue
* @param int $cellStyleId 0 being the default style
* @return int|float|\DateTime|null The value associated with the cell
*/
protected function formatNumericCellValue($nodeValue, $cellStyleId)
{
// Numeric values can represent numbers as well as timestamps.
// We need to look at the style of the cell to determine whether it is one or the other.
$shouldFormatAsDate = $this->styleHelper->shouldFormatNumericValueAsDate($cellStyleId);
if ($shouldFormatAsDate) {
return $this->formatExcelTimestampValue(floatval($nodeValue), $cellStyleId);
} else {
$nodeIntValue = intval($nodeValue);
return ($nodeIntValue == $nodeValue) ? $nodeIntValue : floatval($nodeValue);
}
}
/**
* Returns a cell's PHP Date value, associated to the given timestamp.
* NOTE: The timestamp is a float representing the number of days since January 1st, 1900.
* NOTE: The timestamp can also represent a time, if it is a value between 0 and 1.
*
* @param float $nodeValue
* @param int $cellStyleId 0 being the default style
* @return \DateTime|null The value associated with the cell or NULL if invalid date value
*/
protected function formatExcelTimestampValue($nodeValue, $cellStyleId)
{
// Fix for the erroneous leap year in Excel
if (ceil($nodeValue) > self::ERRONEOUS_EXCEL_LEAP_YEAR_DAY) {
--$nodeValue;
}
if ($nodeValue >= 1) {
// Values greater than 1 represent "dates". The value 1.0 representing the "base" date: 1900-01-01.
return $this->formatExcelTimestampValueAsDateValue($nodeValue, $cellStyleId);
} else if ($nodeValue >= 0) {
// Values between 0 and 1 represent "times".
return $this->formatExcelTimestampValueAsTimeValue($nodeValue, $cellStyleId);
} else {
// invalid date
return null;
}
}
/**
* Returns a cell's PHP DateTime value, associated to the given timestamp.
* Only the time value matters. The date part is set to Jan 1st, 1900 (base Excel date).
*
* @param float $nodeValue
* @param int $cellStyleId 0 being the default style
* @return \DateTime|string The value associated with the cell
*/
protected function formatExcelTimestampValueAsTimeValue($nodeValue, $cellStyleId)
{
$time = round($nodeValue * self::NUM_SECONDS_IN_ONE_DAY);
$hours = floor($time / self::NUM_SECONDS_IN_ONE_HOUR);
$minutes = floor($time / self::NUM_SECONDS_IN_ONE_MINUTE) - ($hours * self::NUM_SECONDS_IN_ONE_MINUTE);
$seconds = $time - ($hours * self::NUM_SECONDS_IN_ONE_HOUR) - ($minutes * self::NUM_SECONDS_IN_ONE_MINUTE);
// using the base Excel date (Jan 1st, 1900) - not relevant here
$dateObj = new \DateTime('1900-01-01');
$dateObj->setTime($hours, $minutes, $seconds);
if ($this->shouldFormatDates) {
$styleNumberFormatCode = $this->styleHelper->getNumberFormatCode($cellStyleId);
$phpDateFormat = DateFormatHelper::toPHPDateFormat($styleNumberFormatCode);
return $dateObj->format($phpDateFormat);
} else {
return $dateObj;
}
}
/**
* Returns a cell's PHP Date value, associated to the given timestamp.
* NOTE: The timestamp is a float representing the number of days since January 1st, 1900.
*
* @param float $nodeValue
* @param int $cellStyleId 0 being the default style
* @return \DateTime|string|null The value associated with the cell or NULL if invalid date value
*/
protected function formatExcelTimestampValueAsDateValue($nodeValue, $cellStyleId)
{
// Do not use any unix timestamps for calculation to prevent
// issues with numbers exceeding 2^31.
$secondsRemainder = fmod($nodeValue, 1) * self::NUM_SECONDS_IN_ONE_DAY;
$secondsRemainder = round($secondsRemainder, 0);
try {
$dateObj = \DateTime::createFromFormat('|Y-m-d', '1899-12-31');
$dateObj->modify('+' . intval($nodeValue) . 'days');
$dateObj->modify('+' . $secondsRemainder . 'seconds');
if ($this->shouldFormatDates) {
$styleNumberFormatCode = $this->styleHelper->getNumberFormatCode($cellStyleId);
$phpDateFormat = DateFormatHelper::toPHPDateFormat($styleNumberFormatCode);
return $dateObj->format($phpDateFormat);
} else {
return $dateObj;
}
} catch (\Exception $e) {
return null;
}
}
/**
* Returns the cell Boolean value from a specific node's Value.
*
* @param string $nodeValue
* @return bool The value associated with the cell
*/
protected function formatBooleanCellValue($nodeValue)
{
// !! is similar to boolval()
$cellValue = !!$nodeValue;
return $cellValue;
}
/**
* Returns a cell's PHP Date value, associated to the given stored nodeValue.
* @see ECMA-376 Part 1 - §18.17.4
*
* @param string $nodeValue ISO 8601 Date string
* @return \DateTime|string|null The value associated with the cell or NULL if invalid date value
*/
protected function formatDateCellValue($nodeValue)
{
// Mitigate thrown Exception on invalid date-time format (http://php.net/manual/en/datetime.construct.php)
try {
return ($this->shouldFormatDates) ? $nodeValue : new \DateTime($nodeValue);
} catch (\Exception $e) {
return null;
}
}
}