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#include <Functions/FunctionFactory.h>
#include <Functions/FunctionStringToString.h>
#include <Functions/StringHelpers.h>
#include <base/find_symbols.h>
namespace DB
{
/** Extract substring after the last slash or backslash.
* If there are no slashes, return the string unchanged.
* It is used to extract filename from path.
*/
struct ExtractBasename
{
static size_t getReserveLengthForElement() { return 16; } /// Just a guess.
static void execute(Pos data, size_t size, Pos & res_data, size_t & res_size)
{
res_data = data;
res_size = size;
Pos pos = data;
Pos end = pos + size;
if ((pos = find_last_symbols_or_null<'/', '\\'>(pos, end)))
{
++pos;
res_data = pos;
res_size = end - pos;
}
}
};
struct NameBasename { static constexpr auto name = "basename"; };
using FunctionBasename = FunctionStringToString<ExtractSubstringImpl<ExtractBasename>, NameBasename>;
REGISTER_FUNCTION(Basename)
{
factory.registerFunction<FunctionBasename>();
}
}
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