C++ StringRef::consume_front方法代码示例

  Expected<URI> uriFromAbsolutePath(StringRef AbsolutePath) const override {
    StringRef Body = AbsolutePath;
    if (!Body.consume_front(testRoot()))
      return make_error<StringError>(AbsolutePath + "does not start with " +
                                         testRoot(),
                                     inconvertibleErrorCode());

    return URI(Scheme, /*Authority=*/"", sys::path::convert_to_slash(Body));
  }

 bool HandleComment(Preprocessor &PP, SourceRange Range) override {
   StringRef Text =
       Lexer::getSourceText(CharSourceRange::getCharRange(Range),
                            PP.getSourceManager(), PP.getLangOpts());
   if (!Text.consume_front(IWYUPragma))
     return false;
   // FIXME(ioeric): resolve the header and store actual file path. For now,
   // we simply assume the written header is suitable to be #included.
   Includes->addMapping(PP.getSourceManager().getFilename(Range.getBegin()),
                        isLiteralInclude(Text) ? Text.str()
                                               : ("\"" + Text + "\"").str());
   return false;
 }

 Expected<std::string> getAbsolutePath(StringRef /*Authority*/, StringRef Body,
                                       StringRef HintPath) const override {
   if (!HintPath.startswith(testRoot()))
     return make_error<StringError>(
         "Hint path doesn't start with test root: " + HintPath,
         inconvertibleErrorCode());
   if (!Body.consume_front("/"))
     return make_error<StringError>(
         "Body of an unittest: URI must start with '/'",
         inconvertibleErrorCode());
   SmallString<16> Path(Body.begin(), Body.end());
   sys::path::native(Path);
   return testPath(Path);
 }

static bool parseCommand(StringRef InputString, bool &IsData,
                         std::string &ModuleName, uint64_t &ModuleOffset) {
  const char kDelimiters[] = " \n\r";
  ModuleName = "";
  if (InputString.consume_front("CODE ")) {
    IsData = false;
  } else if (InputString.consume_front("DATA ")) {
    IsData = true;
  } else {
    // If no cmd, assume it's CODE.
    IsData = false;
  }
  const char *pos = InputString.data();
  // Skip delimiters and parse input filename (if needed).
  if (ClBinaryName.empty()) {
    pos += strspn(pos, kDelimiters);
    if (*pos == '"' || *pos == '\'') {
      char quote = *pos;
      pos++;
      const char *end = strchr(pos, quote);
      if (!end)
        return false;
      ModuleName = std::string(pos, end - pos);
      pos = end + 1;
    } else {
      int name_length = strcspn(pos, kDelimiters);
      ModuleName = std::string(pos, name_length);
      pos += name_length;
    }
  } else {
    ModuleName = ClBinaryName;
  }
  // Skip delimiters and parse module offset.
  pos += strspn(pos, kDelimiters);
  int offset_length = strcspn(pos, kDelimiters);
  return !StringRef(pos, offset_length).getAsInteger(0, ModuleOffset);
}

TEST_F(GDBRemoteCommunicationClientTest, TestPacketSpeedJSON) {
  std::thread server_thread([this] {
    for (;;) {
      StringExtractorGDBRemote request;
      PacketResult result = server.GetPacket(request);
      if (result == PacketResult::ErrorDisconnected)
        return;
      ASSERT_EQ(PacketResult::Success, result);
      StringRef ref = request.GetStringRef();
      ASSERT_TRUE(ref.consume_front("qSpeedTest:response_size:"));
      int size;
      ASSERT_FALSE(ref.consumeInteger(10, size)) << "ref: " << ref;
      std::string response(size, 'X');
      ASSERT_EQ(PacketResult::Success, server.SendPacket(response));
    }
  });

  StreamString ss;
  client.TestPacketSpeed(10, 32, 32, 4096, true, ss);
  client.Disconnect();
  server_thread.join();

  GTEST_LOG_(INFO) << "Formatted output: " << ss.GetData();
  auto object_sp = StructuredData::ParseJSON(ss.GetString());
  ASSERT_TRUE(bool(object_sp));
  auto dict_sp = object_sp->GetAsDictionary();
  ASSERT_TRUE(bool(dict_sp));

  object_sp = dict_sp->GetValueForKey("packet_speeds");
  ASSERT_TRUE(bool(object_sp));
  dict_sp = object_sp->GetAsDictionary();
  ASSERT_TRUE(bool(dict_sp));

  int num_packets;
  ASSERT_TRUE(dict_sp->GetValueForKeyAsInteger("num_packets", num_packets))
      << ss.GetString();
  ASSERT_EQ(10, num_packets);
}

StringRef ValueTypeByHwMode::getMVTName(MVT T) {
  StringRef N = llvm::getEnumName(T.SimpleTy);
  N.consume_front("MVT::");
  return N;
}