CTasks::MkOperationFilter

static function MkOperationFilter($key)
{
	static $arOperationsMap = null;    // will be loaded on demand

	$key = ltrim($key);

	$firstSymbol = mb_substr($key, 0, 1);
	$twoSymbols = mb_substr($key, 0, 2);

	if ($firstSymbol == "=") //Identical
	{
		$key = mb_substr($key, 1);
		$cOperationType = "I";
	}
	elseif ($twoSymbols == "!=") //not Identical
	{
		$key = mb_substr($key, 2);
		$cOperationType = "NI";
	}
	elseif ($firstSymbol == "%") //substring
	{
		$key = mb_substr($key, 1);
		$cOperationType = "S";
	}
	elseif ($twoSymbols == "!%") //not substring
	{
		$key = mb_substr($key, 2);
		$cOperationType = "NS";
	}
	elseif ($firstSymbol == "?") //logical
	{
		$key = mb_substr($key, 1);
		$cOperationType = "?";
	}
	elseif ($twoSymbols == "><") //between
	{
		$key = mb_substr($key, 2);
		$cOperationType = "B";
	}
	elseif ($twoSymbols == "*=") // identical full text match
	{
		$key = mb_substr($key, 2);
		$cOperationType = "FTI";
	}
	elseif ($twoSymbols == "*%") // partial full text match based on LIKE
	{
		$key = mb_substr($key, 2);
		$cOperationType = "FTL";
	}
	elseif ($firstSymbol == "*") // partial full text match
	{
		$key = mb_substr($key, 1);
		$cOperationType = "FT";
	}
	elseif (mb_substr($key, 0, 3) == "!><") //not between
	{
		$key = mb_substr($key, 3);
		$cOperationType = "NB";
	}
	elseif ($twoSymbols == ">=") //greater or equal
	{
		$key = mb_substr($key, 2);
		$cOperationType = "GE";
	}
	elseif ($firstSymbol == ">")  //greater
	{
		$key = mb_substr($key, 1);
		$cOperationType = "G";
	}
	elseif ($twoSymbols == "<=")  //less or equal
	{
		$key = mb_substr($key, 2);
		$cOperationType = "LE";
	}
	elseif ($firstSymbol == "<")  //less
	{
		$key = mb_substr($key, 1);
		$cOperationType = "L";
	}
	elseif ($firstSymbol == "!") // not field LIKE val
	{
		$key = mb_substr($key, 1);
		$cOperationType = "N";
	}
	elseif ($firstSymbol === '#')
	{
		// Preload and cache in static variable
		if ($arOperationsMap === null)
		{
			$arManifest = CTaskFilterCtrl::getManifest();
			$arOperationsMap = $arManifest['Operations map'];
		}

		// Resolve operation code and cutoff operation prefix from item name
		$operation = null;
		foreach ($arOperationsMap as $operationCode => $operationPrefix)
		{
			$pattern = '/^' . preg_quote($operationPrefix) . '[A-Za-z]/';
			if (preg_match($pattern, $key))
			{
				$operation = $operationCode;
				$key = mb_substr($key, mb_strlen($operationPrefix));
				break;
			}
		}

		CTaskAssert::assert($operation !== null);

		$cOperationType = "#" . $operation;
	}
	else
	{
		$cOperationType = "E";
	} // field LIKE val

	return ["FIELD" => $key, "OPERATION" => $cOperationType];
}