naive parser

/***************************************************************************/
/*                                                                         */
/*  This sketch gets the data from the coupled Paraimpu actuator.          */
/*  Thanks to Roberto Musanti                                              */
/*                                                                         */
/*  http://paraimpu.crs4.it                                                */
/*                                                                         */
/*                                                                         */
/* counter = counts the readings                                           */
/* url = actuator address                                                  */
/* metro = tenths of a second of delay between readings                    */
/*                                                                         */
/*  This sketch is released under GPL v3. For more details, please read    */
/*  http://www.gnu.org/licenses/gpl-3.0.txt                                */
/***************************************************************************/


import processing.net.*;

int counter;
int metro;
int module;
String url;
String data;
ArrayList<String> words;
char temp;
String tmpstr;

void setup() {
  counter = 0;
  url = "http://paraimpu.crs4.it/use?token=0895060a-fa3e-4da4-acf0-6d3411754bcb";
  metro = 10;
  data = "";
  words = new ArrayList();
  module = floor(millis() / 100);
}

void draw() {
  data = polling(url, metro);

  /******************************************************************/
  /*  add your code to process the read values and enjoy yourself!  */
  /******************************************************************/
  //lets extract the strings between " and " in the json
  words=parse_string(data);

  //now that we have words, we elaborate them
  elaborate_words(words);

  //we reset data containing json and start all over, also reset words
  cleanAll();

}

//code for resetting stuff at every draw
void cleanAll(){
  data="";
  words.clear();
}

//code for elaborating words
void elaborate_words(ArrayList<String> words){
  //print only the string you want
  String content="";
  String author="";
  if(words.size() >0){
      for (int i=0; i< words.size();i++){
        //println(words.get(i));

        if((words.get(i)).equals("text")){
          content=words.get(++i);
        }
        if((words.get(i)).equals("user")){
          author=words.get(++i);
        }
      }

      println(author);
      println(content);
      println("");
  }

}


//code for extractin string from the json string
ArrayList<String> parse_string(String data){
  ArrayList<String> working =new ArrayList();
  for(int i=0; i< data.length();i++){
      temp=data.charAt(i);
      if (temp=='"') {
        String tempPhrase="";
        i++;
        while((temp=data.charAt(i)) != '"'){
          tempPhrase=tempPhrase+temp;
          i++;
        }
        i++;
        //println(tempPhrase);
        working.add(tempPhrase);
      }
  }
  return working;
}


/******************************************************************************/
/* Polling Paraimpu URL. Until a new data is get, the last read is returned.  */
/******************************************************************************/
String polling(String url, int metro) {
  String value = "";
  if(floor(millis() / 100) == module) {
    module = module + metro;
    counter++;
    //println("tick: " + counter + " - tenths of a second: " + floor(millis() / 100));
    String lines[] = loadStrings(url);
    if(lines != null && lines.length > 0){
        for (int i = 0; i < lines.length; i++) {
          value = value + lines[i];
        //  println("New data - " + value);
        }
    }
  }
  if (value.length() < 1){
      value = data;
  }
  return value;
}