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#include <Functions/FunctionFactory.h>
#include <Functions/FunctionStringToString.h>
#include "protocol.h"
#include <base/find_symbols.h>
namespace DB
{
/// With dot at the end.
struct ExtractWWW
{
static void execute(Pos data, size_t size, Pos & res_data, size_t & res_size)
{
res_data = data;
res_size = 0;
Pos pos = data;
Pos end = pos + size;
if (end != (pos = find_first_symbols<'/'>(pos, end)))
{
if (pos != data)
{
Pos tmp;
size_t protocol_length;
ExtractProtocol::execute(data, size, tmp, protocol_length);
if (pos != data + protocol_length + 1)
return;
}
if (end - pos < 2 || *(pos) != '/' || *(pos + 1) != '/')
return;
const char *start_of_host = (pos += 2);
for (; pos < end; ++pos)
{
if (*pos == '@')
start_of_host = pos + 1;
else if (*pos == ':' || *pos == '/' || *pos == '?' || *pos == '#')
break;
}
if (start_of_host + 4 < end && !strncmp(start_of_host, "www.", 4))
{
res_data = start_of_host;
res_size = 4;
}
}
}
};
struct NameCutWWW { static constexpr auto name = "cutWWW"; };
using FunctionCutWWW = FunctionStringToString<CutSubstringImpl<ExtractWWW>, NameCutWWW>;
REGISTER_FUNCTION(CutWWW)
{
factory.registerFunction<FunctionCutWWW>();
}
}
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