Merge branch 'ext-work'

11 files changed, 1359 insertions, 0 deletions

diff --git a/toolkit/jetpack/sdk/util/array.js b/toolkit/jetpack/sdk/util/array.js
new file mode 100644
index 000000000..1d61a973e
--- /dev/null
+++ b/toolkit/jetpack/sdk/util/array.js
@@ -0,0 +1,123 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+/**
+ * Returns `true` if given `array` contain given `element` or `false`
+ * otherwise.
+ * @param {Array} array
+ *    Target array.
+ * @param {Object|String|Number|Boolean} element
+ *    Element being looked up.
+ * @returns {Boolean}
+ */
+var has = exports.has = function has(array, element) {
+  // shorter and faster equivalent of `array.indexOf(element) >= 0`
+  return !!~array.indexOf(element);
+};
+var hasAny = exports.hasAny = function hasAny(array, elements) {
+  if (arguments.length < 2)
+    return false;
+  if (!Array.isArray(elements))
+    elements = [ elements ];
+  return array.some(function (element) {
+      return has(elements, element);
+  });
+};
+
+/**
+ * Adds given `element` to the given `array` if it does not contain it yet.
+ * `true` is returned if element was added otherwise `false` is returned.
+ * @param {Array} array
+ *    Target array.
+ * @param {Object|String|Number|Boolean} element
+ *    Element to be added.
+ * @returns {Boolean}
+ */
+var add = exports.add = function add(array, element) {
+  var result;
+  if ((result = !has(array, element)))
+    array.push(element);
+
+  return result;
+};
+
+/**
+ * Removes first occurrence of the given `element` from the given `array`. If
+ * `array` does not contain given `element` `false` is returned otherwise
+ * `true` is returned.
+ * @param {Array} array
+ *    Target array.
+ * @param {Object|String|Number|Boolean} element
+ *    Element to be removed.
+ * @returns {Boolean}
+ */
+exports.remove = function remove(array, element) {
+  var result;
+  if ((result = has(array, element)))
+    array.splice(array.indexOf(element), 1);
+
+  return result;
+};
+
+/**
+ * Produces a duplicate-free version of the given `array`.
+ * @param {Array} array
+ *    Source array.
+ * @returns {Array}
+ */
+function unique(array) {
+  return array.reduce(function(result, item) {
+    add(result, item);
+    return result;
+  }, []);
+};
+exports.unique = unique;
+
+/**
+ * Produce an array that contains the union: each distinct element from all
+ * of the passed-in arrays.
+ */
+function union() {
+  return unique(Array.concat.apply(null, arguments));
+};
+exports.union = union;
+
+exports.flatten = function flatten(array){
+   var flat = [];
+   for (var i = 0, l = array.length; i < l; i++) {
+    flat = flat.concat(Array.isArray(array[i]) ? flatten(array[i]) : array[i]);
+   }
+   return flat;
+};
+
+function fromIterator(iterator) {
+  let array = [];
+  if (iterator.__iterator__) {
+    for (let item of iterator)
+      array.push(item);
+  }
+  else {
+    for (let item of iterator)
+      array.push(item);
+  }
+  return array;
+}
+exports.fromIterator = fromIterator;
+
+function find(array, predicate, fallback) {
+  var index = 0;
+  var count = array.length;
+  while (index < count) {
+    var value = array[index];
+    if (predicate(value)) return value;
+    else index = index + 1;
+  }
+  return fallback;
+}
+exports.find = find;
diff --git a/toolkit/jetpack/sdk/util/collection.js b/toolkit/jetpack/sdk/util/collection.js
new file mode 100644
index 000000000..194a29470
--- /dev/null
+++ b/toolkit/jetpack/sdk/util/collection.js
@@ -0,0 +1,115 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+exports.Collection = Collection;
+
+/**
+ * Adds a collection property to the given object.  Setting the property to a
+ * scalar value empties the collection and adds the value.  Setting it to an
+ * array empties the collection and adds all the items in the array.
+ *
+ * @param obj
+ *        The property will be defined on this object.
+ * @param propName
+ *        The name of the property.
+ * @param array
+ *        If given, this will be used as the collection's backing array.
+ */
+exports.addCollectionProperty = function addCollProperty(obj, propName, array) {
+  array = array || [];
+  let publicIface = new Collection(array);
+
+  Object.defineProperty(obj, propName, {
+    configurable: true,
+    enumerable: true,
+
+    set: function set(itemOrItems) {
+      array.splice(0, array.length);
+      publicIface.add(itemOrItems);
+    },
+
+    get: function get() {
+      return publicIface;
+    }
+  });
+};
+
+/**
+ * A collection is ordered, like an array, but its items are unique, like a set.
+ *
+ * @param array
+ *        The collection is backed by an array.  If this is given, it will be
+ *        used as the backing array.  This way the caller can fully control the
+ *        collection.  Otherwise a new empty array will be used, and no one but
+ *        the collection will have access to it.
+ */
+function Collection(array) {
+  array = array || [];
+
+  /**
+   * Provides iteration over the collection.  Items are yielded in the order
+   * they were added.
+   */
+  this.__iterator__ = function Collection___iterator__() {
+    let items = array.slice();
+    for (let i = 0; i < items.length; i++)
+      yield items[i];
+  };
+
+  /**
+   * The number of items in the collection.
+   */
+  this.__defineGetter__("length", function Collection_get_length() {
+    return array.length;
+  });
+
+  /**
+   * Adds a single item or an array of items to the collection.  Any items
+   * already contained in the collection are ignored.
+   *
+   * @param  itemOrItems
+   *         An item or array of items.
+   * @return The collection.
+   */
+  this.add = function Collection_add(itemOrItems) {
+    let items = toArray(itemOrItems);
+    for (let i = 0; i < items.length; i++) {
+      let item = items[i];
+      if (array.indexOf(item) < 0)
+        array.push(item);
+    }
+    return this;
+  };
+
+  /**
+   * Removes a single item or an array of items from the collection.  Any items
+   * not contained in the collection are ignored.
+   *
+   * @param  itemOrItems
+   *         An item or array of items.
+   * @return The collection.
+   */
+  this.remove = function Collection_remove(itemOrItems) {
+    let items = toArray(itemOrItems);
+    for (let i = 0; i < items.length; i++) {
+      let idx = array.indexOf(items[i]);
+      if (idx >= 0)
+        array.splice(idx, 1);
+    }
+    return this;
+  };
+};
+
+function toArray(itemOrItems) {
+  let isArr = itemOrItems &&
+              itemOrItems.constructor &&
+              itemOrItems.constructor.name === "Array";
+  return isArr ? itemOrItems : [itemOrItems];
+}
diff --git a/toolkit/jetpack/sdk/util/contract.js b/toolkit/jetpack/sdk/util/contract.js
new file mode 100644
index 000000000..c689ea601
--- /dev/null
+++ b/toolkit/jetpack/sdk/util/contract.js
@@ -0,0 +1,55 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const { validateOptions: valid } = require("../deprecated/api-utils");
+const method = require("method/core");
+
+// Function takes property validation rules and returns function that given
+// an `options` object will return validated / normalized options back. If
+// option(s) are invalid validator will throw exception described by rules.
+// Returned will also have contain `rules` property with a given validation
+// rules and `properties` function that can be used to generate validated
+// property getter and setters can be mixed into prototype. For more details
+// see `properties` function below.
+function contract(rules) {
+  const validator = (instance, options) => {
+    return valid(options || instance || {}, rules);
+  };
+  validator.rules = rules
+  validator.properties = function(modelFor) {
+    return properties(modelFor, rules);
+  }
+  return validator;
+}
+exports.contract = contract
+
+// Function takes `modelFor` instance state model accessor functions and
+// a property validation rules and generates object with getters and setters
+// that can be mixed into prototype. Property accessors update model for the
+// given instance. If you wish to react to property updates you can always
+// override setters to put specific logic.
+function properties(modelFor, rules) {
+  let descriptor = Object.keys(rules).reduce(function(descriptor, name) {
+    descriptor[name] = {
+      get: function() { return modelFor(this)[name] },
+      set: function(value) {
+        let change = {};
+        change[name] = value;
+        modelFor(this)[name] = valid(change, rules)[name];
+      }
+    }
+    return descriptor
+  }, {});
+  return Object.create(Object.prototype, descriptor);
+}
+exports.properties = properties;
+
+const validate = method("contract/validate");
+exports.validate = validate;
diff --git a/toolkit/jetpack/sdk/util/deprecate.js b/toolkit/jetpack/sdk/util/deprecate.js
new file mode 100644
index 000000000..40f236de5
--- /dev/null
+++ b/toolkit/jetpack/sdk/util/deprecate.js
@@ -0,0 +1,40 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+const { get, format } = require("../console/traceback");
+const { get: getPref } = require("../preferences/service");
+const PREFERENCE = "devtools.errorconsole.deprecation_warnings";
+
+function deprecateUsage(msg) {
+  // Print caller stacktrace in order to help figuring out which code
+  // does use deprecated thing
+  let stack = get().slice(2);
+
+  if (getPref(PREFERENCE)) 
+    console.error("DEPRECATED: " + msg + "\n" + format(stack));
+}
+exports.deprecateUsage = deprecateUsage;
+
+function deprecateFunction(fun, msg) {
+  return function deprecated() {
+    deprecateUsage(msg);
+    return fun.apply(this, arguments);
+  };
+}
+exports.deprecateFunction = deprecateFunction;
+
+function deprecateEvent(fun, msg, evtTypes) {
+  return function deprecateEvent(evtType) {
+  	if (evtTypes.indexOf(evtType) >= 0)
+      deprecateUsage(msg);
+    return fun.apply(this, arguments);
+  };
+}
+exports.deprecateEvent = deprecateEvent;
diff --git a/toolkit/jetpack/sdk/util/dispatcher.js b/toolkit/jetpack/sdk/util/dispatcher.js
new file mode 100644
index 000000000..67d29dfed
--- /dev/null
+++ b/toolkit/jetpack/sdk/util/dispatcher.js
@@ -0,0 +1,54 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+const method = require("method/core");
+
+// Utility function that is just an enhancement over `method` to
+// allow predicate based dispatch in addition to polymorphic
+// dispatch. Unfortunately polymorphic dispatch does not quite
+// cuts it in the world of XPCOM where no types / classes exist
+// and all the XUL nodes share same type / prototype.
+// Probably this is more generic and belongs some place else, but
+// we can move it later once this will be relevant.
+var dispatcher = hint => {
+  const base = method(hint);
+  // Make a map for storing predicate, implementation mappings.
+  let implementations = new Map();
+
+  // Dispatcher function goes through `predicate, implementation`
+  // pairs to find predicate that matches first argument and
+  // returns application of arguments on the associated
+  // `implementation`. If no matching predicate is found delegates
+  // to a `base` polymorphic function.
+  let dispatch = (value, ...rest) => {
+    for (let [predicate, implementation] of implementations) {
+      if (predicate(value))
+        return implementation(value, ...rest);
+    }
+
+    return base(value, ...rest);
+  };
+
+  // Expose base API.
+  dispatch.define = base.define;
+  dispatch.implement = base.implement;
+  dispatch.toString = base.toString;
+
+  // Add a `when` function to allow extending function via
+  // predicates.
+  dispatch.when = (predicate, implementation) => {
+    if (implementations.has(predicate))
+      throw TypeError("Already implemented for the given predicate");
+    implementations.set(predicate, implementation);
+  };
+
+  return dispatch;
+};
+
+exports.dispatcher = dispatcher;
diff --git a/toolkit/jetpack/sdk/util/list.js b/toolkit/jetpack/sdk/util/list.js
new file mode 100644
index 000000000..6d7d2dea9
--- /dev/null
+++ b/toolkit/jetpack/sdk/util/list.js
@@ -0,0 +1,90 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+'use strict';
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+const { Class } = require('../core/heritage');
+const listNS = require('../core/namespace').ns();
+
+const listOptions = {
+  /**
+   * List constructor can take any number of element to populate itself.
+   * @params {Object|String|Number} element
+   * @example
+   *    List(1,2,3).length == 3 // true
+   */
+  initialize: function List() {
+    listNS(this).keyValueMap = [];
+
+    for (let i = 0, ii = arguments.length; i < ii; i++)
+      addListItem(this, arguments[i]);
+  },
+  /**
+   * Number of elements in this list.
+   * @type {Number}
+   */
+  get length() {
+    return listNS(this).keyValueMap.length;
+  },
+   /**
+    * Returns a string representing this list.
+    * @returns {String}
+    */
+  toString: function toString() {
+    return 'List(' + listNS(this).keyValueMap + ')';
+  },
+  /**
+   * Custom iterator providing `List`s enumeration behavior.
+   * We cant reuse `_iterator` that is defined by `Iterable` since it provides
+   * iteration in an arbitrary order.
+   * @see https://developer.mozilla.org/en/JavaScript/Reference/Statements/for...in
+   * @param {Boolean} onKeys
+   */
+  __iterator__: function __iterator__(onKeys, onKeyValue) {
+    let array = listNS(this).keyValueMap.slice(0),
+                i = -1;
+    for (let element of array)
+      yield onKeyValue ? [++i, element] : onKeys ? ++i : element;
+  },
+};
+listOptions[Symbol.iterator] = function iterator() {
+    return listNS(this).keyValueMap.slice(0)[Symbol.iterator]();
+};
+const List = Class(listOptions);
+exports.List = List;
+
+function addListItem(that, value) {
+  let list = listNS(that).keyValueMap,
+      index = list.indexOf(value);
+
+  if (-1 === index) {
+    try {
+      that[that.length] = value;
+    }
+    catch (e) {}
+    list.push(value);
+  }
+}
+exports.addListItem = addListItem;
+
+function removeListItem(that, element) {
+  let list = listNS(that).keyValueMap,
+      index = list.indexOf(element);
+
+  if (0 <= index) {
+    list.splice(index, 1);
+    try {
+      for (let length = list.length; index < length; index++)
+        that[index] = list[index];
+      that[list.length] = undefined;
+    }
+    catch(e){}
+  }
+}
+exports.removeListItem = removeListItem;
+
+exports.listNS = listNS;
diff --git a/toolkit/jetpack/sdk/util/match-pattern.js b/toolkit/jetpack/sdk/util/match-pattern.js
new file mode 100644
index 000000000..a0eb88b49
--- /dev/null
+++ b/toolkit/jetpack/sdk/util/match-pattern.js
@@ -0,0 +1,113 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const { URL } = require('../url');
+const cache = {};
+
+function MatchPattern(pattern) {
+  if (cache[pattern]) return cache[pattern];
+
+  if (typeof pattern.test == "function") {
+    // For compatibility with -moz-document rules, we require the RegExp's
+    // global, ignoreCase, and multiline flags to be set to false.
+    if (pattern.global) {
+      throw new Error("A RegExp match pattern cannot be set to `global` " +
+                      "(i.e. //g).");
+    }
+    if (pattern.multiline) {
+      throw new Error("A RegExp match pattern cannot be set to `multiline` " +
+                      "(i.e. //m).");
+    }
+
+    this.regexp = pattern;
+  }
+  else {
+    let firstWildcardPosition = pattern.indexOf("*");
+    let lastWildcardPosition = pattern.lastIndexOf("*");
+    if (firstWildcardPosition != lastWildcardPosition)
+      throw new Error("There can be at most one '*' character in a wildcard.");
+
+    if (firstWildcardPosition == 0) {
+      if (pattern.length == 1)
+        this.anyWebPage = true;
+      else if (pattern[1] != ".")
+        throw new Error("Expected a *.<domain name> string, got: " + pattern);
+      else
+        this.domain = pattern.substr(2);
+    }
+    else {
+      if (pattern.indexOf(":") == -1) {
+        throw new Error("When not using *.example.org wildcard, the string " +
+                        "supplied is expected to be either an exact URL to " +
+                        "match or a URL prefix. The provided string ('" +
+                        pattern + "') is unlikely to match any pages.");
+      }
+
+      if (firstWildcardPosition == -1)
+        this.exactURL = pattern;
+      else if (firstWildcardPosition == pattern.length - 1)
+        this.urlPrefix = pattern.substr(0, pattern.length - 1);
+      else {
+        throw new Error("The provided wildcard ('" + pattern + "') has a '*' " +
+                        "in an unexpected position. It is expected to be the " +
+                        "first or the last character in the wildcard.");
+      }
+    }
+  }
+
+  cache[pattern] = this;
+}
+
+MatchPattern.prototype = {
+  test: function MatchPattern_test(urlStr) {
+    try {
+      var url = URL(urlStr);
+    }
+    catch (err) {
+      return false;
+    }
+
+    // Test the URL against a RegExp pattern.  For compatibility with
+    // -moz-document rules, we require the RegExp to match the entire URL,
+    // so we not only test for a match, we also make sure the matched string
+    // is the entire URL string.
+    //
+    // Assuming most URLs don't match most match patterns, we call `test` for
+    // speed when determining whether or not the URL matches, then call `exec`
+    // for the small subset that match to make sure the entire URL matches.
+    if (this.regexp && this.regexp.test(urlStr) &&
+        this.regexp.exec(urlStr)[0] == urlStr)
+      return true;
+
+    if (this.anyWebPage && /^(https?|ftp)$/.test(url.scheme))
+      return true;
+
+    if (this.exactURL && this.exactURL == urlStr)
+      return true;
+
+    // Tests the urlStr against domain and check if
+    // wildcard submitted (*.domain.com), it only allows
+    // subdomains (sub.domain.com) or from the root (http://domain.com)
+    // and reject non-matching domains (otherdomain.com)
+    // bug 856913
+    if (this.domain && url.host &&
+         (url.host === this.domain ||
+          url.host.slice(-this.domain.length - 1) === "." + this.domain))
+      return true;
+
+    if (this.urlPrefix && 0 == urlStr.indexOf(this.urlPrefix))
+      return true;
+
+    return false;
+  },
+
+  toString: () => '[object MatchPattern]'
+};
+
+exports.MatchPattern = MatchPattern;
diff --git a/toolkit/jetpack/sdk/util/object.js b/toolkit/jetpack/sdk/util/object.js
new file mode 100644
index 000000000..9d202bb51
--- /dev/null
+++ b/toolkit/jetpack/sdk/util/object.js
@@ -0,0 +1,104 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const { flatten } = require('./array');
+
+/**
+ * Merges all the properties of all arguments into first argument. If two or
+ * more argument objects have own properties with the same name, the property
+ * is overridden, with precedence from right to left, implying, that properties
+ * of the object on the left are overridden by a same named property of the
+ * object on the right.
+ *
+ * Any argument given with "falsy" value - commonly `null` and `undefined` in
+ * case of objects - are skipped.
+ *
+ * @examples
+ *    var a = { bar: 0, a: 'a' }
+ *    var b = merge(a, { foo: 'foo', bar: 1 }, { foo: 'bar', name: 'b' });
+ *    b === a   // true
+ *    b.a       // 'a'
+ *    b.foo     // 'bar'
+ *    b.bar     // 1
+ *    b.name    // 'b'
+ */
+function merge(source) {
+  let descriptor = {};
+
+  // `Boolean` converts the first parameter to a boolean value. Any object is
+  // converted to `true` where `null` and `undefined` becames `false`. Therefore
+  // the `filter` method will keep only objects that are defined and not null.
+  Array.slice(arguments, 1).filter(Boolean).forEach(function onEach(properties) {
+    getOwnPropertyIdentifiers(properties).forEach(function(name) {
+      descriptor[name] = Object.getOwnPropertyDescriptor(properties, name);
+    });
+  });
+  return Object.defineProperties(source, descriptor);
+}
+exports.merge = merge;
+
+/**
+ * Returns an object that inherits from the first argument and contains all the
+ * properties from all following arguments.
+ * `extend(source1, source2, source3)` is equivalent of
+ * `merge(Object.create(source1), source2, source3)`.
+ */
+function extend(source) {
+  let rest = Array.slice(arguments, 1);
+  rest.unshift(Object.create(source));
+  return merge.apply(null, rest);
+}
+exports.extend = extend;
+
+function has(obj, key) {
+  return obj.hasOwnProperty(key);
+}
+exports.has = has;
+
+function each(obj, fn) {
+  for (let key in obj) has(obj, key) && fn(obj[key], key, obj);
+}
+exports.each = each;
+
+/**
+ * Like `merge`, except no property descriptors are manipulated, for use
+ * with platform objects. Identical to underscore's `extend`. Useful for
+ * merging XPCOM objects
+ */
+function safeMerge(source) {
+  Array.slice(arguments, 1).forEach(function onEach (obj) {
+    for (let prop in obj) source[prop] = obj[prop];
+  });
+  return source;
+}
+exports.safeMerge = safeMerge;
+
+/*
+ * Returns a copy of the object without omitted properties
+ */
+function omit(source, ...values) {
+  let copy = {};
+  let keys = flatten(values);
+  for (let prop in source)
+    if (!~keys.indexOf(prop))
+      copy[prop] = source[prop];
+  return copy;
+}
+exports.omit = omit;
+
+// get object's own property Symbols and/or Names, including nonEnumerables by default
+function getOwnPropertyIdentifiers(object, options = { names: true, symbols: true, nonEnumerables: true }) {
+  const symbols = !options.symbols ? [] :
+                  Object.getOwnPropertySymbols(object);
+  const names = !options.names ? [] :
+                options.nonEnumerables ? Object.getOwnPropertyNames(object) :
+                Object.keys(object);
+  return [...names, ...symbols];
+}
+exports.getOwnPropertyIdentifiers = getOwnPropertyIdentifiers;
diff --git a/toolkit/jetpack/sdk/util/rules.js b/toolkit/jetpack/sdk/util/rules.js
new file mode 100644
index 000000000..98e3109b0
--- /dev/null
+++ b/toolkit/jetpack/sdk/util/rules.js
@@ -0,0 +1,53 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const { Class } = require('../core/heritage');
+const { MatchPattern } = require('./match-pattern');
+const { emit } = require('../event/core');
+const { EventTarget } = require('../event/target');
+const { List, addListItem, removeListItem } = require('./list');
+
+// Should deprecate usage of EventEmitter/compose
+const Rules = Class({
+  implements: [
+    EventTarget,
+    List
+  ],
+  add: function(...rules) {
+    return [].concat(rules).forEach(function onAdd(rule) {
+      addListItem(this, rule);
+      emit(this, 'add', rule);
+    }, this);
+  },
+  remove: function(...rules) {
+    return [].concat(rules).forEach(function onRemove(rule) {
+      removeListItem(this, rule);
+      emit(this, 'remove', rule);
+    }, this);
+  },
+  get: function(rule) {
+    let found = false;
+    for (let i in this) if (this[i] === rule) found = true;
+    return found;
+  },
+  // Returns true if uri matches atleast one stored rule
+  matchesAny: function(uri) {
+    return !!filterMatches(this, uri).length;
+  },
+  toString: () => '[object Rules]'
+});
+exports.Rules = Rules;
+
+function filterMatches(instance, uri) {
+  let matches = [];
+  for (let i in instance) {
+    if (new MatchPattern(instance[i]).test(uri)) matches.push(instance[i]);
+  }
+  return matches;
+}
diff --git a/toolkit/jetpack/sdk/util/sequence.js b/toolkit/jetpack/sdk/util/sequence.js
new file mode 100644
index 000000000..28e3de255
--- /dev/null
+++ b/toolkit/jetpack/sdk/util/sequence.js
@@ -0,0 +1,593 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+module.metadata = {
+  "stability": "experimental"
+};
+
+// Disclamer:
+// In this module we'll have some common argument / variable names
+// to hint their type or behavior.
+//
+// - `f` stands for "function" that is intended to be side effect
+//   free.
+// - `p` stands for "predicate" that is function which returns logical
+//   true or false and is intended to be side effect free.
+// - `x` / `y` single item of the sequence.
+// - `xs` / `ys` sequence of `x` / `y` items where `x` / `y` signifies
+//    type of the items in sequence, so sequence is not of the same item.
+// - `_` used for argument(s) or variable(s) who's values are ignored.
+
+const { complement, flip, identity } = require("../lang/functional");
+const { isArray, isArguments, isMap, isSet, isGenerator,
+        isString, isBoolean, isNumber } = require("../lang/type");
+
+const Sequence = function Sequence(iterator) {
+  if (!isGenerator(iterator)) {
+    throw TypeError("Expected generator argument");
+  }
+
+  this[Symbol.iterator] = iterator;
+};
+exports.Sequence = Sequence;
+
+const polymorphic = dispatch => x =>
+  x === null ? dispatch.null(null) :
+  x === void(0) ? dispatch.void(void(0)) :
+  isArray(x) ? (dispatch.array || dispatch.indexed)(x) :
+  isString(x) ? (dispatch.string || dispatch.indexed)(x) :
+  isArguments(x) ? (dispatch.arguments || dispatch.indexed)(x) :
+  isMap(x) ? dispatch.map(x) :
+  isSet(x) ? dispatch.set(x) :
+  isNumber(x) ? dispatch.number(x) :
+  isBoolean(x) ? dispatch.boolean(x) :
+  dispatch.default(x);
+
+const nogen = function*() {};
+const empty = () => new Sequence(nogen);
+exports.empty = empty;
+
+const seq = polymorphic({
+  null: empty,
+  void: empty,
+  array: identity,
+  string: identity,
+  arguments: identity,
+  map: identity,
+  set: identity,
+  default: x => x instanceof Sequence ? x : new Sequence(x)
+});
+exports.seq = seq;
+
+// Function to cast seq to string.
+const string = (...etc) => "".concat(...etc);
+exports.string = string;
+
+// Function for casting seq to plain object.
+const object = (...pairs) => {
+  let result = {};
+  for (let [key, value] of pairs)
+    result[key] = value;
+
+  return result;
+};
+exports.object = object;
+
+// Takes `getEnumerator` function that returns `nsISimpleEnumerator`
+// and creates lazy sequence of it's items. Note that function does
+// not take `nsISimpleEnumerator` itslef because that would allow
+// single iteration, which would not be consistent with rest of the
+// lazy sequences.
+const fromEnumerator = getEnumerator => seq(function* () {
+  const enumerator = getEnumerator();
+  while (enumerator.hasMoreElements())
+   yield enumerator.getNext();
+});
+exports.fromEnumerator = fromEnumerator;
+
+// Takes `object` and returns lazy sequence of own `[key, value]`
+// pairs (does not include inherited and non enumerable keys).
+const pairs = polymorphic({
+  null: empty,
+  void: empty,
+  map: identity,
+  indexed: indexed => seq(function* () {
+    const count = indexed.length;
+    let index = 0;
+    while (index < count) {
+      yield [index, indexed[index]];
+      index = index + 1;
+    }
+  }),
+  default: object => seq(function* () {
+    for (let key of Object.keys(object))
+      yield [key, object[key]];
+  })
+});
+exports.pairs = pairs;
+
+const names = polymorphic({
+  null: empty,
+  void: empty,
+  default: object => seq(function*() {
+    for (let name of Object.getOwnPropertyNames(object)) {
+      yield name;
+    }
+  })
+});
+exports.names = names;
+
+const symbols = polymorphic({
+  null: empty,
+  void: empty,
+  default: object => seq(function* () {
+    for (let symbol of Object.getOwnPropertySymbols(object)) {
+      yield symbol;
+    }
+  })
+});
+exports.symbols = symbols;
+
+const keys = polymorphic({
+  null: empty,
+  void: empty,
+  indexed: indexed => seq(function* () {
+    const count = indexed.length;
+    let index = 0;
+    while (index < count) {
+      yield index;
+      index = index + 1;
+    }
+  }),
+  map: map => seq(function* () {
+    for (let [key, _] of map)
+      yield key;
+  }),
+  default: object => seq(function* () {
+    for (let key of Object.keys(object))
+      yield key;
+  })
+});
+exports.keys = keys;
+
+
+const values = polymorphic({
+  null: empty,
+  void: empty,
+  set: identity,
+  indexed: indexed => seq(function* () {
+    const count = indexed.length;
+    let index = 0;
+    while (index < count) {
+      yield indexed[index];
+      index = index + 1;
+    }
+  }),
+  map: map => seq(function* () {
+    for (let [_, value] of map) yield value;
+  }),
+  default: object => seq(function* () {
+    for (let key of Object.keys(object)) yield object[key];
+  })
+});
+exports.values = values;
+
+
+
+// Returns a lazy sequence of `x`, `f(x)`, `f(f(x))` etc.
+// `f` must be free of side-effects. Note that returned
+// sequence is infinite so it must be consumed partially.
+//
+// Implements clojure iterate:
+// http://clojuredocs.org/clojure_core/clojure.core/iterate
+const iterate = (f, x) => seq(function* () {
+  let state = x;
+  while (true) {
+    yield state;
+    state = f(state);
+  }
+});
+exports.iterate = iterate;
+
+// Returns a lazy sequence of the items in sequence for which `p(item)`
+// returns `true`. `p` must be free of side-effects.
+//
+// Implements clojure filter:
+// http://clojuredocs.org/clojure_core/clojure.core/filter
+const filter = (p, sequence) => seq(function* () {
+  if (sequence !== null && sequence !== void(0)) {
+    for (let item of sequence) {
+      if (p(item))
+        yield item;
+    }
+  }
+});
+exports.filter = filter;
+
+// Returns a lazy sequence consisting of the result of applying `f` to the
+// set of first items of each sequence, followed by applying f to the set
+// of second items in each sequence, until any one of the sequences is
+// exhausted. Any remaining items in other sequences are ignored. Function
+// `f` should accept number-of-sequences arguments.
+//
+// Implements clojure map:
+// http://clojuredocs.org/clojure_core/clojure.core/map
+const map = (f, ...sequences) => seq(function* () {
+  const count = sequences.length;
+  // Optimize a single sequence case
+  if (count === 1) {
+    let [sequence] = sequences;
+    if (sequence !== null && sequence !== void(0)) {
+      for (let item of sequence)
+        yield f(item);
+    }
+  }
+  else {
+    // define args array that will be recycled on each
+    // step to aggregate arguments to be passed to `f`.
+    let args = [];
+    // define inputs to contain started generators.
+    let inputs = [];
+
+    let index = 0;
+    while (index < count) {
+      inputs[index] = sequences[index][Symbol.iterator]();
+      index = index + 1;
+    }
+
+    // Run loop yielding of applying `f` to the set of
+    // items at each step until one of the `inputs` is
+    // exhausted.
+    let done = false;
+    while (!done) {
+      let index = 0;
+      let value = void(0);
+      while (index < count && !done) {
+        ({ done, value } = inputs[index].next());
+
+        // If input is not exhausted yet store value in args.
+        if (!done) {
+          args[index] = value;
+          index = index + 1;
+        }
+      }
+
+      // If none of the inputs is exhasted yet, `args` contain items
+      // from each input so we yield application of `f` over them.
+      if (!done)
+        yield f(...args);
+    }
+  }
+});
+exports.map = map;
+
+// Returns a lazy sequence of the intermediate values of the reduction (as
+// per reduce) of sequence by `f`, starting with `initial` value if provided.
+//
+// Implements clojure reductions:
+// http://clojuredocs.org/clojure_core/clojure.core/reductions
+const reductions = (...params) => {
+  const count = params.length;
+  let hasInitial = false;
+  let f, initial, source;
+  if (count === 2) {
+    [f, source] = params;
+  }
+  else if (count === 3) {
+    [f, initial, source] = params;
+    hasInitial = true;
+  }
+  else {
+    throw Error("Invoked with wrong number of arguments: " + count);
+  }
+
+  const sequence = seq(source);
+
+  return seq(function* () {
+    let started = hasInitial;
+    let result = void(0);
+
+    // If initial is present yield it.
+    if (hasInitial)
+      yield (result = initial);
+
+    // For each item of the sequence accumulate new result.
+    for (let item of sequence) {
+      // If nothing has being yield yet set result to first
+      // item and yield it.
+      if (!started) {
+        started = true;
+        yield (result = item);
+      }
+      // Otherwise accumulate new result and yield it.
+      else {
+        yield (result = f(result, item));
+      }
+    }
+
+    // If nothing has being yield yet it's empty sequence and no
+    // `initial` was provided in which case we need to yield `f()`.
+    if (!started)
+      yield f();
+  });
+};
+exports.reductions = reductions;
+
+// `f` should be a function of 2 arguments. If `initial` is not supplied,
+// returns the result of applying `f` to the first 2 items in sequence, then
+// applying `f` to that result and the 3rd item, etc. If sequence contains no
+// items, `f` must accept no arguments as well, and reduce returns the
+// result of calling f with no arguments. If sequence has only 1 item, it
+// is returned and `f` is not called. If `initial` is supplied, returns the
+// result of applying `f` to `initial` and the first item in  sequence, then
+// applying `f` to that result and the 2nd item, etc. If sequence contains no
+// items, returns `initial` and `f` is not called.
+//
+// Implements clojure reduce:
+// http://clojuredocs.org/clojure_core/clojure.core/reduce
+const reduce = (...args) => {
+  const xs = reductions(...args);
+  let x;
+  for (x of xs) void(0);
+  return x;
+};
+exports.reduce = reduce;
+
+const each = (f, sequence) => {
+  for (let x of seq(sequence)) void(f(x));
+};
+exports.each = each;
+
+
+const inc = x => x + 1;
+// Returns the number of items in the sequence. `count(null)` && `count()`
+// returns `0`. Also works on strings, arrays, Maps & Sets.
+
+// Implements clojure count:
+// http://clojuredocs.org/clojure_core/clojure.core/count
+const count = polymorphic({
+  null: _ => 0,
+  void: _ => 0,
+  indexed: indexed => indexed.length,
+  map: map => map.size,
+  set: set => set.size,
+  default: xs => reduce(inc, 0, xs)
+});
+exports.count = count;
+
+// Returns `true` if sequence has no items.
+
+// Implements clojure empty?:
+// http://clojuredocs.org/clojure_core/clojure.core/empty_q
+const isEmpty = sequence => {
+  // Treat `null` and `undefined` as empty sequences.
+  if (sequence === null || sequence === void(0))
+    return true;
+
+  // If contains any item non empty so return `false`.
+  for (let _ of sequence)
+    return false;
+
+  // If has not returned yet, there was nothing to iterate
+  // so it's empty.
+  return true;
+};
+exports.isEmpty = isEmpty;
+
+const and = (a, b) => a && b;
+
+// Returns true if `p(x)` is logical `true` for every `x` in sequence, else
+// `false`.
+//
+// Implements clojure every?:
+// http://clojuredocs.org/clojure_core/clojure.core/every_q
+const isEvery = (p, sequence) => {
+  if (sequence !== null && sequence !== void(0)) {
+    for (let item of sequence) {
+      if (!p(item))
+        return false;
+    }
+  }
+  return true;
+};
+exports.isEvery = isEvery;
+
+// Returns the first logical true value of (p x) for any x in sequence,
+// else `null`.
+//
+// Implements clojure some:
+// http://clojuredocs.org/clojure_core/clojure.core/some
+const some = (p, sequence) => {
+  if (sequence !== null && sequence !== void(0)) {
+    for (let item of sequence) {
+      if (p(item))
+        return true;
+    }
+  }
+  return null;
+};
+exports.some = some;
+
+// Returns a lazy sequence of the first `n` items in sequence, or all items if
+// there are fewer than `n`.
+//
+// Implements clojure take:
+// http://clojuredocs.org/clojure_core/clojure.core/take
+const take = (n, sequence) => n <= 0 ? empty() : seq(function* () {
+  let count = n;
+  for (let item of sequence) {
+    yield item;
+    count = count - 1;
+    if (count === 0) break;
+  }
+});
+exports.take = take;
+
+// Returns a lazy sequence of successive items from sequence while
+// `p(item)` returns `true`. `p` must be free of side-effects.
+//
+// Implements clojure take-while:
+// http://clojuredocs.org/clojure_core/clojure.core/take-while
+const takeWhile = (p, sequence) => seq(function* () {
+  for (let item of sequence) {
+    if (!p(item))
+      break;
+
+    yield item;
+  }
+});
+exports.takeWhile = takeWhile;
+
+// Returns a lazy sequence of all but the first `n` items in
+// sequence.
+//
+// Implements clojure drop:
+// http://clojuredocs.org/clojure_core/clojure.core/drop
+const drop = (n, sequence) => seq(function* () {
+  if (sequence !== null && sequence !== void(0)) {
+    let count = n;
+    for (let item of sequence) {
+      if (count > 0)
+        count = count - 1;
+      else
+        yield item;
+    }
+  }
+});
+exports.drop = drop;
+
+// Returns a lazy sequence of the items in sequence starting from the
+// first item for which `p(item)` returns falsy value.
+//
+// Implements clojure drop-while:
+// http://clojuredocs.org/clojure_core/clojure.core/drop-while
+const dropWhile = (p, sequence) => seq(function* () {
+  let keep = false;
+  for (let item of sequence) {
+    keep = keep || !p(item);
+    if (keep) yield item;
+  }
+});
+exports.dropWhile = dropWhile;
+
+// Returns a lazy sequence representing the concatenation of the
+// suplied sequences.
+//
+// Implements clojure conact:
+// http://clojuredocs.org/clojure_core/clojure.core/concat
+const concat = (...sequences) => seq(function* () {
+  for (let sequence of sequences)
+    for (let item of sequence)
+      yield item;
+});
+exports.concat = concat;
+
+// Returns the first item in the sequence.
+//
+// Implements clojure first:
+// http://clojuredocs.org/clojure_core/clojure.core/first
+const first = sequence => {
+  if (sequence !== null && sequence !== void(0)) {
+    for (let item of sequence)
+      return item;
+  }
+  return null;
+};
+exports.first = first;
+
+// Returns a possibly empty sequence of the items after the first.
+//
+// Implements clojure rest:
+// http://clojuredocs.org/clojure_core/clojure.core/rest
+const rest = sequence => drop(1, sequence);
+exports.rest = rest;
+
+// Returns the value at the index. Returns `notFound` or `undefined`
+// if index is out of bounds.
+const nth = (xs, n, notFound) => {
+  if (n >= 0) {
+    if (isArray(xs) || isArguments(xs) || isString(xs)) {
+      return n < xs.length ? xs[n] : notFound;
+    }
+    else if (xs !== null && xs !== void(0)) {
+      let count = n;
+      for (let x of xs) {
+        if (count <= 0)
+          return x;
+
+        count = count - 1;
+      }
+    }
+  }
+  return notFound;
+};
+exports.nth = nth;
+
+// Return the last item in sequence, in linear time.
+// If `sequence` is an array or string or arguments
+// returns in constant time.
+// Implements clojure last:
+// http://clojuredocs.org/clojure_core/clojure.core/last
+const last = polymorphic({
+  null: _ => null,
+  void: _ => null,
+  indexed: indexed => indexed[indexed.length - 1],
+  map: xs => reduce((_, x) => x, xs),
+  set: xs => reduce((_, x) => x, xs),
+  default: xs => reduce((_, x) => x, xs)
+});
+exports.last = last;
+
+// Return a lazy sequence of all but the last `n` (default 1) items
+// from the give `xs`.
+//
+// Implements clojure drop-last:
+// http://clojuredocs.org/clojure_core/clojure.core/drop-last
+const dropLast = flip((xs, n=1) => seq(function* () {
+  let ys = [];
+  for (let x of xs) {
+    ys.push(x);
+    if (ys.length > n)
+      yield ys.shift();
+  }
+}));
+exports.dropLast = dropLast;
+
+// Returns a lazy sequence of the elements of `xs` with duplicates
+// removed
+//
+// Implements clojure distinct
+// http://clojuredocs.org/clojure_core/clojure.core/distinct
+const distinct = sequence => seq(function* () {
+  let items = new Set();
+  for (let item of sequence) {
+    if (!items.has(item)) {
+      items.add(item);
+      yield item;
+    }
+  }
+});
+exports.distinct = distinct;
+
+// Returns a lazy sequence of the items in `xs` for which
+// `p(x)` returns false. `p` must be free of side-effects.
+//
+// Implements clojure remove
+// http://clojuredocs.org/clojure_core/clojure.core/remove
+const remove = (p, xs) => filter(complement(p), xs);
+exports.remove = remove;
+
+// Returns the result of applying concat to the result of
+// `map(f, xs)`. Thus function `f` should return a sequence.
+//
+// Implements clojure mapcat
+// http://clojuredocs.org/clojure_core/clojure.core/mapcat
+const mapcat = (f, sequence) => seq(function* () {
+  const sequences = map(f, sequence);
+  for (let sequence of sequences)
+    for (let item of sequence)
+      yield item;
+});
+exports.mapcat = mapcat;
diff --git a/toolkit/jetpack/sdk/util/uuid.js b/toolkit/jetpack/sdk/util/uuid.js
new file mode 100644
index 000000000..6d0f2de53
--- /dev/null
+++ b/toolkit/jetpack/sdk/util/uuid.js
@@ -0,0 +1,19 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.metadata = {
+  "stability": "unstable"
+};
+
+const { Cc, Ci, components: { ID: parseUUID } } = require('chrome');
+const { generateUUID } = Cc['@mozilla.org/uuid-generator;1'].
+                          getService(Ci.nsIUUIDGenerator);
+
+// Returns `uuid`. If `id` is passed then it's parsed to `uuid` and returned
+// if not then new one is generated.
+exports.uuid = function uuid(id) {
+  return id ? parseUUID(id) : generateUUID();
+};