void JsonStreamingParser::parse()

in Firmware/ExpressivePixelsCore/JsonStreamingParser.cpp [50:211]

• 135 lines of code
• 58 McCabe index (conditional complexity)

void JsonStreamingParser::parse(char c) {
    //System.out.print(c);
    // valid whitespace characters in JSON (from RFC4627 for JSON) include:
    // space, horizontal tab, line feed or new line, and carriage return.
    // thanks:
    // http://stackoverflow.com/questions/16042274/definition-of-whitespace-in-json
    if ((c == ' ' || c == '\t' || c == '\n' || c == '\r')
        && !(state == STATE_IN_STRING || state == STATE_UNICODE || state == STATE_HEXBYTES || state == STATE_START_ESCAPE
            || state == STATE_IN_NUMBER || state == STATE_START_DOCUMENT)) {
      return;
    }
    switch (state) {
    case STATE_IN_STRING:
      if (c == '"') {
        endString();
      } else if (c == '\\') {		  
        state = STATE_START_ESCAPE;
      } else if ((c < 0x1f) || (c == 0x7f)) {
        //throw new RuntimeException("Unescaped control character encountered: " + c + " at position" + characterCounter);
      } else {
        buffer[bufferPos] = c;
        increaseBufferPointer();
      }
      break;
    case STATE_IN_ARRAY:
      if (c == ']') {
        endArray();
      } else {
        startValue(c);
      }
      break;
    case STATE_IN_OBJECT:
      if (c == '}') {
        endObject();
      } else if (c == '"') {
        startKey();
      } else {
        //throw new RuntimeException("Start of string expected for object key. Instead got: " + c + " at position" + characterCounter);
      }
      break;
    case STATE_END_KEY:
      if (c != ':') {
        //throw new RuntimeException("Expected ':' after key. Instead got " + c + " at position" + characterCounter);
      }
      state = STATE_AFTER_KEY;
      break;
    case STATE_AFTER_KEY:
      startValue(c);
      break;
    case STATE_START_ESCAPE:
      processEscapeCharacters(c);
      break;
    case STATE_UNICODE:
      processUnicodeCharacter(c);
      break;
	case STATE_HEXBYTES:
		processHexByteCharacter(c);
		break;
    case STATE_UNICODE_SURROGATE:
      unicodeEscapeBuffer[unicodeEscapeBufferPos] = c;
      unicodeEscapeBufferPos++;
      if (unicodeEscapeBufferPos == 2) {
        endUnicodeSurrogateInterstitial();
      }
      break;
    case STATE_AFTER_VALUE: {
      // not safe for size == 0!!!
      int within = stack[stackPos - 1];
      if (within == STACK_OBJECT) {
        if (c == '}') {
          endObject();
        } else if (c == ',') {
          state = STATE_IN_OBJECT;
        } else {
          //throw new RuntimeException("Expected ',' or '}' while parsing object. Got: " + c + ". " + characterCounter);
        }
      } else if (within == STACK_ARRAY) {
        if (c == ']') {
          endArray();
        } else if (c == ',') {
          state = STATE_IN_ARRAY;
        } else {
          //throw new RuntimeException("Expected ',' or ']' while parsing array. Got: " + c + ". " + characterCounter);

        }
      } else {
        //throw new RuntimeException("Finished a literal, but unclear what state to move to. Last state: " + characterCounter);
      }
    }break;
    case STATE_IN_NUMBER:
      if (c >= '0' && c <= '9') {
        buffer[bufferPos] = c;
        increaseBufferPointer();
      } else if (c == '.') {
        if (doesCharArrayContain(buffer, bufferPos, '.')) {
          //throw new RuntimeException("Cannot have multiple decimal points in a number. " + characterCounter);
        } else if (doesCharArrayContain(buffer, bufferPos, 'e')) {
          //throw new RuntimeException("Cannot have a decimal point in an exponent." + characterCounter);
        }
        buffer[bufferPos] = c;
        increaseBufferPointer();
      } else if (c == 'e' || c == 'E') {
        if (doesCharArrayContain(buffer, bufferPos, 'e')) {
          //throw new RuntimeException("Cannot have multiple exponents in a number. " + characterCounter);
        }
        buffer[bufferPos] = c;
        increaseBufferPointer();
      } else if (c == '+' || c == '-') {
        char last = buffer[bufferPos - 1];
        if (!(last == 'e' || last == 'E')) {
          //throw new RuntimeException("Can only have '+' or '-' after the 'e' or 'E' in a number." + characterCounter);
        }
        buffer[bufferPos] = c;
        increaseBufferPointer();
      } else {
        endNumber();
        // we have consumed one beyond the end of the number
        parse(c);
      }
      break;
    case STATE_IN_TRUE:
      buffer[bufferPos] = c;
      increaseBufferPointer();
      if (bufferPos == 4) {
        endTrue();
      }
      break;
    case STATE_IN_FALSE:
      buffer[bufferPos] = c;
      increaseBufferPointer();
      if (bufferPos == 5) {
        endFalse();
      }
      break;
    case STATE_IN_NULL:
      buffer[bufferPos] = c;
      increaseBufferPointer();
      if (bufferPos == 4) {
        endNull();
      }
      break;
    case STATE_START_DOCUMENT:
      myListener->startDocument();
      if (c == '[') {
        startArray();
      } else if (c == '{') {
        startObject();
      } else {
        // throw new ParsingError($this->_line_number,
        // $this->_char_number,
        // "Document must start with object or array.");
      }
      break;
    //case STATE_DONE:
      // throw new ParsingError($this->_line_number, $this->_char_number,
      // "Expected end of document.");
    //default:
      // throw new ParsingError($this->_line_number, $this->_char_number,
      // "Internal error. Reached an unknown state: ".$this->_state);
    }
    characterCounter++;
  }