Spark v0.2.2 out of memory

Firmware
5

This is generally known as FSM or finite state machine parsing. I use this technique to parse an XML weather stream and then once I find the part I am interested in, I use the C function strtok() to find the boundaries between things, in my case I use the double-quote character.

OK, I am going to post this, but this is not the most beautiful code I have ever written--I have been meaning the go back and clean this up.

The serialEvent function consumes one byte out of the client buffer and uses a series of boolean flags to know where it is in stream, either tag or data--the title flag for future use. When it finds something that starts with "<yweather:forecast ", it gathers a line of data for the strtok() parsing part. I use under 200 bytes this way. The things called ptr are just indexes really--not the best name.

const char startMatch[] = "<yweather:forecast ";
const char titleStart[] = "<title>";
const char titleEnd[] = {'<', '/','\0'};

void serialEvent() {
    char inChar = myTCP.read();
    if (tagFlag==false && dataFlag==false && inChar == startMatch[matchPtr]) {
        tagFlag = true;
        dataFlag = false;
        titleFlag = false;
        matchPtr++;
    } else if (tagFlag==true && inChar == startMatch[matchPtr]) {
        matchPtr++;
        if (matchPtr == strlen(startMatch)) {  //done with tag, start data
            clearStr(dataStr);
            dataPtr = 0;
            dataFlag = true;
            tagFlag = false;
            titleFlag = false;
            matchPtr = 0;
        }
    } else if (tagFlag == true) {
        matchPtr = 0;
        tagFlag = false;
        if (inChar == startMatch[matchPtr]) {
           
            tagFlag = true;
            dataFlag = false;
            matchPtr++;
        }       
    } else if (dataFlag==true && ( (inChar==char(10)) || (inChar==char(12)) ) ) {  // carriage-return or line-feed
      
      dataStr[dataPtr] = '\0';	  //null term the string
      parseForecast();    // call the next parse step
    } else if (dataFlag == true) {
    dataStr[dataPtr] = inChar;  // store data away
    if (dataPtr < MAX_DATA_STR_LEN-2) {
      dataPtr++;
    } 
  } 
}

Here's a link to an older post I made about about the parseForecast() part:

I know this is a bit unclear but I hope it gets the ideas flowing.