Method readJSONDouble

lib/cpp/src/thrift/protocol/TJSONProtocol.cpp:887–926

Reads a JSON number or string and interprets it as a double.

// Reads a JSON number or string and interprets it as a double.
uint32_t TJSONProtocol::readJSONDouble(double& num) {
  uint32_t result = context_->read(reader_);
  std::string str;
  if (reader_.peek() == kJSONStringDelimiter) {
    result += readJSONString(str, true);
    // Check for NaN, Infinity and -Infinity
    if (str == kThriftNan) {
      num = HUGE_VAL / HUGE_VAL; // generates NaN
    } else if (str == kThriftInfinity) {
      num = HUGE_VAL;
    } else if (str == kThriftNegativeInfinity) {
      num = -HUGE_VAL;
    } else {
      if (!context_->escapeNum()) {
        // Throw exception -- we should not be in a string in this case
        throw TProtocolException(TProtocolException::INVALID_DATA,
                                     "Numeric data unexpectedly quoted");
      }
      try {
        num = fromString<double>(str);
      } catch (const std::runtime_error&) {
        throw TProtocolException(TProtocolException::INVALID_DATA,
                                     "Expected numeric value; got \"" + str + "\"");
      }
    }
  } else {
    if (context_->escapeNum()) {
      // This will throw - we should have had a quote if escapeNum == true
      readJSONSyntaxChar(kJSONStringDelimiter);
    }
    result += readJSONNumericChars(str);
    try {
      num = fromString<double>(str);
    } catch (const std::runtime_error&) {
      throw TProtocolException(TProtocolException::INVALID_DATA,
                                   "Expected numeric value; got \"" + str + "\"");
    }
  }
  return result;
}

uint32_t TJSONProtocol::readJSONObjectStart() {
  uint32_t result = context_->read(reader_);