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<?php
declare(strict_types = 1);
namespace LanguageDetection;
/**
* Class Language
*
* @copyright Patrick Schur
* @license https://opensource.org/licenses/mit-license.html MIT
* @author Patrick Schur <patrick_schur@outlook.de>
* @package LanguageDetection
*/
class Language extends NgramParser
{
/**
* @var array<string, array<string, int>>
*/
protected $tokens = [];
/**
* Loads all language files
*
* @param array $lang List of ISO 639-1 codes, that should be used in the detection phase
* @param string $dirname Name of the directory where the translations files are located
*/
public function __construct(array $lang = [], string $dirname = '')
{
if (empty($dirname))
{
$dirname = __DIR__ . '/../../resources/*/*.php';
}
else if (!\is_dir($dirname) || !\is_readable($dirname))
{
throw new \InvalidArgumentException('Provided directory could not be found or is not readable');
}
else
{
$dirname = \rtrim($dirname, '/');
$dirname .= '/*/*.php';
}
$isEmpty = empty($lang);
$tokens = [];
foreach (\glob($dirname) as $file)
{
if ($isEmpty || \in_array(\basename($file, '.php'), $lang))
{
$tokens += require $file;
}
}
foreach ($tokens as $lang => $value) {
$this->tokens[$lang] = \array_flip($value);
}
}
/**
* Detects the language from a given text string
*
* @param string $str
* @return LanguageResult
*/
public function detect(string $str): LanguageResult
{
$str = \mb_strtolower($str);
$samples = $this->getNgrams($str);
$result = [];
if (\count($samples) > 0)
{
foreach ($this->tokens as $lang => $value)
{
$index = $sum = 0;
foreach ($samples as $v)
{
if (isset($value[$v]))
{
$x = $index++ - $value[$v];
$y = $x >> (PHP_INT_SIZE * 8);
$sum += ($x + $y) ^ $y;
continue;
}
$sum += $this->maxNgrams;
++$index;
}
$result[$lang] = 1 - ($sum / ($this->maxNgrams * $index));
}
\arsort($result, SORT_NUMERIC);
}
return new LanguageResult($result);
}
}
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