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<?php namespace Maatwebsite\Excel\Classes;
use PHPExcel_IOFactory;
use Illuminate\Filesystem\Filesystem;
use Maatwebsite\Excel\Exceptions\LaravelExcelException;
class FormatIdentifier {
/**
* Available formats
*
* @var array
* @access protected
*/
protected $formats = [
'Excel2007',
'Excel5',
'Excel2003XML',
'OOCalc',
'SYLK',
'Gnumeric',
'CSV',
'HTML',
'PDF'
];
/**
* Construct new format identifier
* @param Filesystem $filesystem
*/
public function __construct(Filesystem $filesystem)
{
$this->filesystem = $filesystem;
}
/**
* Get the file format by file
* @param $file
* @throws LaravelExcelException
* @return string $format
*/
public function getFormatByFile($file)
{
// get the file extension
$ext = $this->getExtension($file);
// get the file format
$format = $this->getFormatByExtension($ext);
// Check if the file can be read
if ($this->canRead($format, $file))
return $format;
// Do a last try to init the file with all available readers
return $this->lastResort($file, $format, $ext);
}
/**
* Identify file format
* @param $ext
* @return string $format
*/
public function getFormatByExtension($ext)
{
switch ($ext)
{
/*
|--------------------------------------------------------------------------
| Excel 2007
|--------------------------------------------------------------------------
*/
case 'xlsx':
case 'xlsm':
case 'xltx':
case 'xltm':
return 'Excel2007';
break;
/*
|--------------------------------------------------------------------------
| Excel5
|--------------------------------------------------------------------------
*/
case 'xls':
case 'xlt':
return 'Excel5';
break;
/*
|--------------------------------------------------------------------------
| OOCalc
|--------------------------------------------------------------------------
*/
case 'ods':
case 'ots':
return 'OOCalc';
break;
/*
|--------------------------------------------------------------------------
| SYLK
|--------------------------------------------------------------------------
*/
case 'slk':
return 'SYLK';
break;
/*
|--------------------------------------------------------------------------
| Excel2003XML
|--------------------------------------------------------------------------
*/
case 'xml':
return 'Excel2003XML';
break;
/*
|--------------------------------------------------------------------------
| Gnumeric
|--------------------------------------------------------------------------
*/
case 'gnumeric':
return 'Gnumeric';
break;
/*
|--------------------------------------------------------------------------
| HTML
|--------------------------------------------------------------------------
*/
case 'htm':
case 'html':
return 'HTML';
break;
/*
|--------------------------------------------------------------------------
| CSV
|--------------------------------------------------------------------------
*/
case 'csv':
case 'txt':
return 'CSV';
break;
/*
|--------------------------------------------------------------------------
| PDF
|--------------------------------------------------------------------------
*/
case 'pdf':
return 'PDF';
break;
}
}
/**
* Get the content type by file format
* @param string $format
* @return string $contentType
*/
public function getContentTypeByFormat($format)
{
switch ($format)
{
/*
|--------------------------------------------------------------------------
| Excel 2007
|--------------------------------------------------------------------------
*/
case 'Excel2007':
return 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet; charset=UTF-8';
break;
/*
|--------------------------------------------------------------------------
| Excel5
|--------------------------------------------------------------------------
*/
case 'Excel5':
return 'application/vnd.ms-excel; charset=UTF-8';
break;
/*
|--------------------------------------------------------------------------
| HTML
|--------------------------------------------------------------------------
*/
case 'HTML':
return 'HTML';
break;
/*
|--------------------------------------------------------------------------
| CSV
|--------------------------------------------------------------------------
*/
case 'CSV':
return 'application/csv; charset=UTF-8';
break;
/*
|--------------------------------------------------------------------------
| PDF
|--------------------------------------------------------------------------
*/
case 'PDF':
return'application/pdf; charset=UTF-8';
break;
}
}
/**
* Try every reader we have
* @param $file
* @param bool $wrongFormat
* @param string $ext
* @throws LaravelExcelException
* @return string $format
*/
protected function lastResort($file, $wrongFormat = false, $ext = 'xls')
{
// Loop through all available formats
foreach ($this->formats as $format)
{
// Check if the file could be read
if ($wrongFormat != $format && $this->canRead($format, $file))
return $format;
}
// Give up searching and throw an exception
throw new LaravelExcelException('[ERROR] Reader could not identify file format for file [' . $file . '] with extension [' . $ext . ']');
}
/**
* Check if we can read the file
* @param $format
* @param $file
* @return boolean
*/
protected function canRead($format, $file)
{
if ($format)
{
$reader = $this->initReader($format);
return $reader && $reader->canRead($file);
}
return false;
}
/**
* Init the reader based on the format
* @param string $format
* @return \PHPExcel_Reader_IReader
*/
protected function initReader($format)
{
return PHPExcel_IOFactory::createReader($format);
}
/**
* Get the file extension
* @param string $file
* @return string
*/
protected function getExtension($file)
{
return strtolower($this->filesystem->extension($file));
}
}