1 // Copyright 2024 gRPC authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include "src/core/util/dump_args.h"
16
17 #include "absl/log/check.h"
18 #include "absl/strings/ascii.h"
19 #include "absl/strings/string_view.h"
20
21 namespace grpc_core {
22 namespace dump_args_detail {
23
Stringify(CustomSink & sink) const24 void DumpArgs::Stringify(CustomSink& sink) const {
25 // Parse the argument string into a vector of keys.
26 // #__VA_ARGS__ produces a stringified version of the arguments passed to the
27 // macro. It's comma separated, and we can use that to split the string into
28 // keys. Those keys might include parenthesis for e.g. argument lists, and so
29 // we need to skip commas that are inside parenthesis.
30 std::vector<absl::string_view> keys;
31 int depth = 0;
32 const char* start = arg_string_;
33 for (const char* p = arg_string_; *p; ++p) {
34 if (*p == '(') {
35 ++depth;
36 } else if (*p == ')') {
37 --depth;
38 } else if (*p == ',' && depth == 0) {
39 keys.push_back(absl::string_view(start, p - start));
40 start = p + 1;
41 }
42 }
43 keys.push_back(start);
44 CHECK_EQ(keys.size(), arg_dumpers_.size());
45 for (size_t i = 0; i < keys.size(); i++) {
46 if (i != 0) sink.Append(", ");
47 sink.Append(absl::StripAsciiWhitespace(keys[i]));
48 sink.Append(" = ");
49 arg_dumpers_[i](sink);
50 }
51 }
52
53 } // namespace dump_args_detail
54 } // namespace grpc_core
55