splat-ecs/lib/save-data.js

A 2D HTML5 Canvas game engine

/**
 * @namespace Splat.saveData
 */

var platform = require("./platform");

function cookieGet(name) {
  var value = "; " + document.cookie;
  var parts = value.split("; " + name + "=");
  if (parts.length === 2) {
    return parts.pop().split(";").shift();
  } else {
    throw "cookie " + name + " was not found";
  }
}

function cookieSet(name, value) {
  var expire = new Date();
  expire.setTime(expire.getTime() + 1000 * 60 * 60 * 24 * 365);
  var cookie = name + "=" + value + "; expires=" + expire.toUTCString() + ";";
  document.cookie = cookie;
}

function getMultiple(getSingleFunc, keys, callback) {
  if (typeof keys === "string") {
    keys = [keys];
  }

  var data;
  try {
    data = keys.map(function(key) {
      return [key, getSingleFunc(key)];
    }).reduce(function(accum, pair) {
      accum[pair[0]] = pair[1];
      return accum;
    }, {});
  } catch (e) {
    return callback(e);
  }
  callback(undefined, data);
}

function setMultiple(setSingleFunc, data, callback) {
  try {
    for (var key in data) {
      if (data.hasOwnProperty(key)) {
        setSingleFunc(key, data[key]);
      }
    }
  } catch (e) {
    return callback(e);
  }
  callback();
}

var cookieSaveData = {
  "get": getMultiple.bind(undefined, cookieGet),
  "set": setMultiple.bind(undefined, cookieSet)
};

function localStorageGet(name) {
  return window.localStorage.getItem(name);
}

function localStorageSet(name, value) {
  window.localStorage.setItem(name, value.toString());
}

var localStorageSaveData = {
  "get": getMultiple.bind(undefined, localStorageGet),
  "set": setMultiple.bind(undefined, localStorageSet)
};

/**
 * A function that is called when save data has finished being retrieved.
 * @callback saveDataGetFinished
 * @param {error} err If defined, err is the error that occurred when retrieving the data.
 * @param {object} data The key-value pairs of data that were previously saved.
 */
/**
 * Retrieve data previously stored with {@link Splat.saveData.set}.
 * @alias Splat.saveData.get
 * @param {string | Array} keys A single key or array of key names of data items to retrieve.
 * @param {saveDataGetFinished} callback A callback that is called with the data when it has been retrieved.
 */
function chromeStorageGet(keys, callback) {
  window.chrome.storage.sync.get(keys, function(data) {
    if (window.chrome.runtime.lastError) {
      callback(window.chrome.runtime.lastError);
    } else {
      callback(undefined, data);
    }
  });
}

/**
 * A function that is called when save data has finished being stored.
 * @callback saveDataSetFinished
 * @param {error} err If defined, err is the error that occurred when saving the data.
 */
/**
 * Store data for later.
 * @alias Splat.saveData.set
 * @param {object} data An object containing key-value pairs of data to save.
 * @param {saveDataSetFinished} callback A callback that is called when the data has finished saving.
 */
function chromeStorageSet(data, callback) {
  window.chrome.storage.sync.set(data, function() {
    callback(window.chrome.runtime.lastError);
  });
}

var chromeStorageSaveData = {
  "get": chromeStorageGet,
  "set": chromeStorageSet
};

if (platform.isChromeApp()) {
  module.exports = chromeStorageSaveData;
} else if (window.localStorage) {
  module.exports = localStorageSaveData;
} else {
  module.exports = cookieSaveData;
}