1 | #include <Functions/FunctionFactory.h> |
---|---|
2 | #include <Functions/FunctionStringToString.h> |
3 | #include <common/find_symbols.h> |
4 | #include "FunctionsURL.h" |
5 | |
6 | namespace DB |
7 | { |
8 | |
9 | /** Extract substring after the last slash or backslash. |
10 | * If there are no slashes, return the string unchanged. |
11 | * It is used to extract filename from path. |
12 | */ |
13 | struct ExtractBasename |
14 | { |
15 | static size_t getReserveLengthForElement() { return 16; } /// Just a guess. |
16 | |
17 | static void execute(Pos data, size_t size, Pos & res_data, size_t & res_size) |
18 | { |
19 | res_data = data; |
20 | res_size = size; |
21 | |
22 | Pos pos = data; |
23 | Pos end = pos + size; |
24 | |
25 | if ((pos = find_last_symbols_or_null<'/', '\\'>(pos, end))) |
26 | { |
27 | ++pos; |
28 | res_data = pos; |
29 | res_size = end - pos; |
30 | } |
31 | } |
32 | }; |
33 | |
34 | struct NameBasename { static constexpr auto name = "basename"; }; |
35 | using FunctionBasename = FunctionStringToString<ExtractSubstringImpl<ExtractBasename>, NameBasename>; |
36 | |
37 | void registerFunctionBasename(FunctionFactory & factory) |
38 | { |
39 | factory.registerFunction<FunctionBasename>(); |
40 | } |
41 | |
42 | } |
43 |