node-gpio.js

var gpio = require('./build/Release/gpio.node');
var util = require('util');
var EventEmitter = require('events').EventEmitter;


/**
 * Capacitive Touch Events
 */
extend(true, gpio.CapacitiveTouch.prototype, EventEmitter.prototype);
gpio.CapacitiveTouch.interval = null;
gpio.CapacitiveTouch.prototype.listen = function (tolerence) {
    tolerence = tolerence | 0;
    var old = -1;
    var self = this;
    this.interval = setInterval(function (){
        var value = self.getSample(10);
        var pushed = value > self.threshold;
        if (old != pushed) {
            self.emit("changed", {value: pushed, charge: value});
        }
        old = pushed;
    }, tolerence);
};
gpio.CapacitiveTouch.prototype.stopListen = function () {
    clearInterval(this.interval);
};


/**
 * GPIO Events
 */
extend(true, gpio.GPIO.prototype, EventEmitter.prototype);
gpio.GPIO.interval = null;
gpio.GPIO.prototype.listen = function () {
    var old = -1;
    var self = this;
    this.interval = setInterval(function (){
        var value = self.read();
        if (old != value) {
            self.emit("changed", value);
        }
        old = value;
    });
};
gpio.GPIO.prototype.stopListen = function () {
    clearInterval(this.interval);
};


module.exports = gpio;







function extend() {
  // copy reference to target object
  var target = arguments[0] || {},
      i = 1,
      length = arguments.length,
      deep = false,
      options,
      name,
      src,
      copy;

  // Handle a deep copy situation
  if (typeof target === "boolean") {
    deep = target;
    target = arguments[1] || {};
    // skip the boolean and the target
    i = 2;
  }

  // Handle case when target is a string or something (possible in deep copy)
  if (typeof target !== "object" && !typeof target === 'function')
    target = {};

  var isPlainObject = function(obj) {
    // Must be an Object.
    // Because of IE, we also have to check the presence of the constructor
    // property.
    // Make sure that DOM nodes and window objects don't pass through, as well
    if (!obj || toString.call(obj) !== "[object Object]" || obj.nodeType
        || obj.setInterval)
      return false;

    var has_own_constructor = hasOwnProperty.call(obj, "constructor");
    var has_is_prop_of_method = hasOwnProperty.call(obj.constructor.prototype,
                                                    "isPrototypeOf");
    // Not own constructor property must be Object
    if (obj.constructor && !has_own_constructor && !has_is_prop_of_method)
      return false;

    // Own properties are enumerated firstly, so to speed up,
    // if last one is own, then all properties are own.

    var last_key;
    for (key in obj)
      last_key = key;

    return typeof last_key === "undefined" || hasOwnProperty.call(obj, last_key);
  };


  for (; i < length; i++) {
    // Only deal with non-null/undefined values
    if ((options = arguments[i]) !== null) {
      // Extend the base object
      for (name in options) {
        src = target[name];
        copy = options[name];

        // Prevent never-ending loop
        if (target === copy)
            continue;

        // Recurse if we're merging object literal values or arrays
        if (deep && copy && (isPlainObject(copy) || Array.isArray(copy))) {
          var clone = src && (isPlainObject(src) || Array.isArray(src)
                              ? src : (Array.isArray(copy) ? [] : {}));

          // Never move original objects, clone them
          target[name] = extend(deep, clone, copy);

        // Don't bring in undefined values
        } else if (typeof copy !== "undefined")
          target[name] = copy;
      }
    }
  }

  // Return the modified object
  return target;
};