node-red-contrib-snap4city-user/lib/js/parser.js

Nodes for Snap4city project, targeted to standard user (no developer)

/* determine type of value and extract the contained attributes according to the following formats 
- format A (comma separated pairs):
  attribute:value, ...., attribute:value  
- format B (comma separated basic values):
  value, ..., value (in this case the attribute name would be csv_"pos" where pos is the position) 
- format C (JSON values):
  {attribute:value, ..., attribute:value}
- format D (XML values):
  <record><attribute>value</attribute>...<attribute>value</attribute></record>  
*/
function snap4cityParser(sensorID, protocol, value) {
  if (protocol == "ngsi") {
    value["source"] = "ngsi";
    return value;
  }
  var attributes = [];
  var f = ""; // identified format
  console.log("valore processato " + value);
  value = value.trim();
  var first = value.charAt(0);
  switch (first) {
    case "{": // Format C
      attributes = parseJSON(value);
      f = "JSON";
      break;
    case "<": // Format D
      attributes = parseXML(value);
      f = "XML";
      break;
    default: // Format A or B
      attributes = parseCSV(value);
      f = "CSV";
  }
  return {
    "id": sensorID,
    "source": protocol,
    attributes
  };
}

Number.prototype.padLeft = function (base, chr) {
  var len = (String(base || 10).length - String(this).length) + 1;
  return len > 0 ? new Array(len).join(chr || '0') + this : this;
}


function parseCSV(value) {
  /*
  parse comma separated values 
  each value can assume the following formats:
  format A (comma separated pair): attribute:value  
  format B (comma separated basic value):  value
  */
  var delims = ",";
  var properties = value.split(delims);
  var attributes = [];
  var format = "A";
  var cv;
  var pos = 1;
  for (i = 0; i < properties.length; i++) {
    var prop = properties[i].trim();
    if (prop.indexOf(":") == -1 || (prop.indexOf(":") > 0 && prop.indexOf(":") != prop.lastIndexOf(":"))) { // condition is that ":" do not occur or
      // ":"  occurs once in any prop and not in the first position
      id = "csv_" + pos;
      pos++;
      val = properties[i].trim();
      if (determineType(val) == "date") {
        var d = new Date(val);
        val = [(d.getMonth() + 1).padLeft(),
            d.getDate().padLeft(),
            d.getFullYear()
          ].join('/') +
          ' ' + [d.getHours().padLeft(),
            d.getMinutes().padLeft(),
            d.getSeconds().padLeft()
          ].join(':');

      }
      attributes.push({
        [id]: {
          "type": determineType(val),
          "value": val
        }
      });
    } else {
      cv = properties[i].split(":");
      myid = cv[0].trim();
      val = cv[1].trim();
      var attr = {};
      if (determineType(val) == "date") {
        var d = new Date(val);
        val = [(d.getMonth() + 1).padLeft(),
            d.getDate().padLeft(),
            d.getFullYear()
          ].join('/') +
          ' ' + [d.getHours().padLeft(),
            d.getMinutes().padLeft(),
            d.getSeconds().padLeft()
          ].join(':');

      }
      attr[myid] = {
        "type": determineType(val),
        "value": val
      };
      attributes.push(attr);
    }
  }
  console.log(attributes);
  return attributes;
}

/*  this function should be completed */
function parseXML(value) {
  var attributes = [];
  var pos = 1;
  id = "xml_" + pos;
  val = prop.trim();
  attributes.push({
    id: {
      "type": determineType(val),
      "value": val
    }
  });
}

/*  this function should be completed */
function parseJSON(value) {
  var attributes = [];
  var pos = 1;
  id = "json_" + pos;
  val = prop.trim();
  attributes.push({
    id: {
      "type": determineType(val),
      "value": val
    }
  });
}


function validateFloat(strFloat) {
  if (/^(\-|\+)?([0-9]+(\.[0-9]+)?|Infinity)$/
    .test(strFloat))
    return true;
  return false;
}

function validateInt(strInt) {
  if (/^(\-|\+)?([0-9]+)$/
    .test(strInt))
    return true;
  return false;
}

// YYYY/MM/DD or MM/DD/YYYY
function validateDate(strDate) {
  //  var t = /^(?=.+([\/.-])..\1)(?=.{10}$)(?:(\d{4}).|)(\d\d).(\d\d)(?:.(\d{4})|)$/;
  //  strDate.replace(t, function($, _, y, m, d, y2) {
  //    $ = new Date(y = y || y2, m, d);
  //    t = $.getFullYear() != y || $.getMonth() != m || $.getDate() != d;
  //  });
  //  return !t;
  var mydate = Date.parse(strDate);
  if (isNaN(mydate)) return false;
  else return true;
}

function determineType(value) {
  var selectorType = "";
  if (validateInt(value)) {
    selectorType = "integer";
  } else if (value.match("[A-Za-z][A-Za-z0-9]*")) {
    selectorType = "string";
  } else if (validateFloat(value)) {
    selectorType = "float";
  } else if (validateDate(value)) {
    selectorType = "date";
  } else {
    selectorType = "object";
  }
  return selectorType;
}


function testA() {
  return "aaa"
}