swepam/lib/schema.js

a json interface to the swepam readings

'use strict';

var delimit = require('./delimit');
var schema = {
  year: Number,
  month: Number,
  day: Number,
  time: String,
  julian: Number,
  seconds: {
    unit: 's',
    longform: 'seconds',
    type: Number
  },
  status: Number,
  protonDensity: {
    unit: 'p/cc',
    longform: 'parts per cubic-centimetre',
    type: Number
  },
  bulkSpeed: {
    unit: 'km/s',
    longform: 'kilometres per second',
    type: Number
  },
  ionTemperature: {
    unit: 'K',
    longform: 'degrees kelvin',
    type: Number
  }
};

function coerceValues(readings) {
  for (var i in readings) {
    readings[i][0] = schema.year(readings[i][0]);
    readings[i][1] = schema.month(readings[i][1]);
    readings[i][2] = schema.day(readings[i][2]);
    readings[i][3] = schema.time(readings[i][3]);
    readings[i][4] = schema.julian(readings[i][4]);
    readings[i][5] = schema.seconds.type(readings[i][5]);
    readings[i][6] = schema.status(readings[i][6]);
    readings[i][7] = readings[i][6] === 9 ? null : schema.protonDensity.type(readings[i][7]);
    readings[i][8] = readings[i][6] === 9 ? null : schema.bulkSpeed.type(readings[i][8]);
    readings[i][9] = readings[i][6] === 9 ? null : schema.ionTemperature.type(readings[i][9]);
  }
  return readings;
}

function objectify(readings) {
  for (var i in readings) {
    readings[i] = {
      year: readings[i][0],
      month: readings[i][1],
      day: readings[i][2],
      time: readings[i][3],
      julian: readings[i][4],
      seconds: readings[i][5],
      status: readings[i][6],
      protonDensity: readings[i][7],
      bulkSpeed: readings[i][8],
      ionTemperature: readings[i][9]
    };
  }
  return readings;
}

module.exports = function(raw) {
  return objectify(coerceValues(delimit(raw)));
};