live-set
Version:
Class representing a changing and transformable collection of items.
438 lines (366 loc) • 41.7 kB
JavaScript
"use strict";
var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));
var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));
var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));
var _Scheduler = _interopRequireDefault(require("./Scheduler"));
var _symbolObservable = _interopRequireDefault(require("symbol-observable"));
var LiveSet =
/*#__PURE__*/
function () {
// Whether we can mutate the _values Set.
function LiveSet(init) {
(0, _classCallCheck2.default)(this, LiveSet);
(0, _defineProperty2.default)(this, "_init", void 0);
(0, _defineProperty2.default)(this, "_scheduler", void 0);
(0, _defineProperty2.default)(this, "_values", null);
(0, _defineProperty2.default)(this, "_mutableValues", false);
(0, _defineProperty2.default)(this, "_active", null);
(0, _defineProperty2.default)(this, "_inSubscriptionStart", false);
(0, _defineProperty2.default)(this, "_ended", false);
(0, _defineProperty2.default)(this, "_endedWithError", false);
(0, _defineProperty2.default)(this, "_error", null);
(0, _defineProperty2.default)(this, "_queuedCall", false);
(0, _defineProperty2.default)(this, "_changeQueue", []);
(0, _defineProperty2.default)(this, "_observers", []);
this._init = init;
this._scheduler = init.scheduler || LiveSet.defaultScheduler;
}
(0, _createClass2.default)(LiveSet, [{
key: "_queueChange",
value: function _queueChange(record) {
var _this = this;
if (record) {
this._changeQueue.push(record);
}
if (!this._queuedCall) {
this._queuedCall = true;
this._scheduler.schedule(function () {
_this._queuedCall = false;
var changes = _this._changeQueue;
_this._changeQueue = [];
var observersToCall;
var ended = _this._ended;
if (ended) {
observersToCall = _this._observers;
_this._observers = [];
} else {
observersToCall = _this._observers.slice();
}
observersToCall.forEach(function (record) {
var observer = record.observer,
ignore = record.ignore;
var observerNext = observer.next;
if (observerNext) {
if (ignore === 0) {
observerNext.call(observer, changes);
} else {
record.ignore = 0;
var changesToDeliver = changes.slice(ignore);
if (changesToDeliver.length) {
observerNext.call(observer, changesToDeliver);
}
}
}
if (ended) {
if (_this._endedWithError) {
if (observer.error) observer.error(_this._error);
} else {
if (observer.complete) observer.complete();
}
}
});
});
}
}
}, {
key: "_deactivate",
value: function _deactivate() {
if (!this._active) throw new Error('already inactive');
var listenHandler = this._active.listenHandler;
this._active = null;
if (listenHandler) {
listenHandler.unsubscribe();
}
}
}, {
key: "values",
value: function values() {
if (this._values) {
if (this._active && !this._inSubscriptionStart) {
var listenHandler = this._active.listenHandler;
if (listenHandler.pullChanges) {
listenHandler.pullChanges();
}
}
if (this._mutableValues) {
this._mutableValues = false;
makeSetImmutable(this._values);
}
/*:: if (!this._values) throw new Error(); */
return this._values;
} else {
if (this._active) {
throw new Error('tried to call values() on liveset during subscription before setValues was called');
}
var s = this._init.read();
makeSetImmutable(s);
return s;
}
}
}, {
key: "isEnded",
value: function isEnded() {
return this._ended;
}
}, {
key: "getScheduler",
value: function getScheduler() {
return this._scheduler;
}
}, {
key: "subscribe",
value: function subscribe(observerOrOnNext, onError, onComplete) {
var _this2 = this;
var liveSet = this;
var observer;
if (typeof observerOrOnNext === 'function') {
observer = {
next: observerOrOnNext,
error: onError,
complete: onComplete
};
} else {
observer = observerOrOnNext;
}
observer;
if (this._ended) {
var _subscription = {
closed: false,
unsubscribe: function unsubscribe() {
_subscription.closed = true;
},
pullChanges: function pullChanges() {}
};
if (observer.start) {
observer.start(_subscription);
}
if (!_subscription.closed) {
if (this._endedWithError) {
if (observer.error) {
observer.error(this._error);
}
} else {
if (observer.complete) {
observer.complete();
}
}
}
_subscription.closed = true;
return _subscription;
}
var observerRecord = {
observer: observer,
ignore: this._changeQueue.length
};
var isStarting = true;
var unsubscribedInStart = false;
var subscription = {
/*:: closed: false&&` */
get closed() {
return !isStarting && liveSet._observers.indexOf(observerRecord) < 0;
}
/*:: ` */
,
unsubscribe: function unsubscribe() {
if (isStarting) {
unsubscribedInStart = true;
return;
}
var ix = _this2._observers.indexOf(observerRecord);
if (ix >= 0) {
_this2._observers.splice(ix, 1);
if (!_this2._ended && _this2._observers.length === 0) {
_this2._values = null;
_this2._deactivate();
}
}
},
pullChanges: function pullChanges() {
if (_this2._active && _this2._active.listenHandler && _this2._active.listenHandler.pullChanges) {
_this2._active.listenHandler.pullChanges();
}
var changeQueueLength = _this2._changeQueue.length;
var originalNext = observer.next;
if (changeQueueLength !== 0 && originalNext) {
var changesToDeliver = _this2._changeQueue.slice(observerRecord.ignore);
if (changesToDeliver.length !== 0) {
observerRecord.ignore = changeQueueLength;
originalNext.call(observer, changesToDeliver);
}
}
}
};
if (!this._active) {
var _controller2 = {
// Flow doesn't support getters and setters yet
/*:: closed: false&&` */
get closed() {
return !liveSet._active || liveSet._active.controller !== this;
}
/*:: ` */
,
add: function add(value) {
var values = _this2._values;
if (!values) throw new Error('setValue must be called before controller is used');
if (!_this2._ended && !values.has(value)) {
if (!_this2._mutableValues) {
_this2._values = values = new Set(values);
_this2._mutableValues = true;
}
values.add(value);
_this2._queueChange({
type: 'add',
value: value
});
}
},
remove: function remove(value) {
var values = _this2._values;
if (!values) throw new Error('setValue must be called before controller is used');
if (!_this2._ended && values.has(value)) {
if (!_this2._mutableValues) {
_this2._values = values = new Set(values);
_this2._mutableValues = true;
}
values.delete(value);
_this2._queueChange({
type: 'remove',
value: value
});
}
},
error: function error(err) {
if (_this2._ended) return;
_this2._ended = true;
_this2._endedWithError = true;
_this2._error = err;
_this2._queueChange();
_this2._deactivate();
},
end: function end() {
if (_this2._ended) return;
_this2._ended = true;
_this2._queueChange();
_this2._deactivate();
}
};
var active = this._active = {
controller: _controller2,
listenHandler: {
unsubscribe: function unsubscribe() {}
}
};
var setValuesError = function setValuesError() {
throw new Error('setValues must be called once during listen');
};
var _setValues2 = function _setValues(values) {
_setValues2 = setValuesError;
makeSetImmutable(values);
_this2._values = values;
_this2._mutableValues = false;
};
var listenHandlerOrFunction = this._init.listen(function (values) {
return _setValues2(values);
}, _controller2);
if (!this._values) {
setValuesError();
}
if (typeof listenHandlerOrFunction === 'function') {
active.listenHandler = {
unsubscribe: listenHandlerOrFunction
};
} else if (listenHandlerOrFunction != null && typeof listenHandlerOrFunction.unsubscribe === 'function') {
active.listenHandler = listenHandlerOrFunction;
} else if (listenHandlerOrFunction != null) {
throw new TypeError('listen must return object with unsubscribe method, a function, or null');
}
if (_controller2.closed) {
this._active = active;
this._deactivate();
}
}
if (observer.start) {
this._inSubscriptionStart = true;
observer.start(subscription);
this._inSubscriptionStart = false;
}
isStarting = false;
observerRecord.ignore = this._changeQueue.length;
if (!unsubscribedInStart) {
this._observers.push(observerRecord);
}
return subscription;
}
}], [{
key: "active",
value: function active(initialValues, options) {
var set = initialValues || new Set();
var controller;
var liveSet = new LiveSet({
scheduler: options ? options.scheduler : undefined,
read: function read() {
return set;
},
listen: function listen(setValues, _controller) {
setValues(set);
controller = _controller;
}
});
liveSet.subscribe({});
return {
liveSet: liveSet,
controller: controller
};
}
}, {
key: "constant",
value: function constant(values, options) {
makeSetImmutable(values);
var shouldNotHappen = function shouldNotHappen() {
throw new Error('Should not happen');
};
var ls = new LiveSet({
scheduler: options ? options.scheduler : undefined,
read: shouldNotHappen,
listen: shouldNotHappen
});
ls._ended = true;
ls._values = values;
ls._mutableValues = false;
return ls;
}
}]);
return LiveSet;
}(); // Assign here because Flow doesn't support computed property keys on classes:
// https://github.com/facebook/flow/issues/2286
exports.default = LiveSet;
(0, _defineProperty2.default)(LiveSet, "defaultScheduler", new _Scheduler.default());
LiveSet.prototype[_symbolObservable.default] = function () {
return this;
};
function makeSetImmutable(set) {
if (process.env.NODE_ENV !== 'production') {
set.add = set.delete = set.clear = readOnly;
}
}
function readOnly() {
throw new Error('Do not modify Set passed to or from LiveSet: Set is read-only in development');
}
module.exports = exports.default;
module.exports.default = exports.default;
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?LiveSetSubscriber<T>;\n  +error?: ?(err: any) => void;\n  +complete?: ?() => void;\n};\n\ntype LiveSetObserverRecord<T> = {\n  ignore: number;\n  observer: LiveSetObserver<T>;\n};\n\nexport default class LiveSet<T> {\n  static defaultScheduler = new Scheduler();\n\n  _init: LiveSetInit<T>;\n  _scheduler: Scheduler;\n\n  _values: ?Set<T> = null;\n  _mutableValues: boolean = false; // Whether we can mutate the _values Set.\n\n  _active: ?{\n    controller: LiveSetController<T>;\n    listenHandler: ListenHandler;\n  } = null;\n  _inSubscriptionStart = false;\n  _ended: boolean = false;\n  _endedWithError: boolean = false;\n  _error: any = null;\n  _queuedCall: boolean = false;\n  _changeQueue: Array<LiveSetChangeRecord<T>> = [];\n  _observers: Array<LiveSetObserverRecord<T>> = [];\n\n  constructor(init: LiveSetInit<T>) {\n    this._init = init;\n    this._scheduler = init.scheduler || LiveSet.defaultScheduler;\n  }\n\n  static active<T>(initialValues: ?Set<T>, options: ?{scheduler?: Scheduler}): {liveSet: LiveSet<T>, controller: LiveSetController<T>} {\n    const set = initialValues || new Set();\n    let controller;\n    const liveSet = new LiveSet({\n      scheduler: options ? options.scheduler : undefined,\n      read: () => set,\n      listen: (setValues, _controller) => {\n        setValues(set);\n        controller = _controller;\n      }\n    });\n    liveSet.subscribe({});\n    return {liveSet, controller: (controller: any)};\n  }\n\n  static constant<T>(values: Set<T>, options: ?{scheduler?: Scheduler}): LiveSet<T> {\n    makeSetImmutable(values);\n    const shouldNotHappen = () => {\n      throw new Error('Should not happen');\n    };\n    const ls = new LiveSet({\n      scheduler: options ? options.scheduler : undefined,\n      read: shouldNotHappen,\n      listen: shouldNotHappen\n    });\n    ls._ended = true;\n    ls._values = values;\n    ls._mutableValues = false;\n    return ls;\n  }\n\n  _queueChange(record: ?LiveSetChangeRecord<T>) {\n    if (record) {\n      this._changeQueue.push(record);\n    }\n    if (!this._queuedCall) {\n      this._queuedCall = true;\n      this._scheduler.schedule(() => {\n        this._queuedCall = false;\n        const changes = this._changeQueue;\n        this._changeQueue = [];\n        let observersToCall;\n        const ended = this._ended;\n        if (ended) {\n          observersToCall = this._observers;\n          this._observers = [];\n        } else {\n          observersToCall = this._observers.slice();\n        }\n        observersToCall.forEach(record => {\n          const {observer, ignore} = record;\n          const observerNext = observer.next;\n          if (observerNext) {\n            if (ignore === 0) {\n              observerNext.call(observer, changes);\n            } else {\n              record.ignore = 0;\n              const changesToDeliver = changes.slice(ignore);\n              if (changesToDeliver.length) {\n                observerNext.call(observer, changesToDeliver);\n              }\n            }\n          }\n          if (ended) {\n            if (this._endedWithError) {\n              if (observer.error) observer.error(this._error);\n            } else {\n              if (observer.complete) observer.complete();\n            }\n          }\n        });\n      });\n    }\n  }\n\n  _deactivate() {\n    if (!this._active) throw new Error('already inactive');\n    const {listenHandler} = this._active;\n    this._active = null;\n    if (listenHandler) {\n      listenHandler.unsubscribe();\n    }\n  }\n\n  values(): Set<T> {\n    if (this._values) {\n      if (this._active && !this._inSubscriptionStart) {\n        const {listenHandler} = this._active;\n        if (listenHandler.pullChanges) {\n          listenHandler.pullChanges();\n        }\n      }\n      if (this._mutableValues) {\n        this._mutableValues = false;\n        makeSetImmutable(this._values);\n      }\n      /*:: if (!this._values) throw new Error(); */\n      return this._values;\n    } else {\n      if (this._active) {\n        throw new Error('tried to call values() on liveset during subscription before setValues was called');\n      }\n      const s = this._init.read();\n      makeSetImmutable(s);\n      return s;\n    }\n  }\n\n  isEnded(): boolean {\n    return this._ended;\n  }\n\n  getScheduler(): Scheduler {\n    return this._scheduler;\n  }\n\n  subscribe(observerOrOnNext: LiveSetObserver<T> | LiveSetSubscriber<T>, onError: ?(err: any) => void, onComplete: ?() => void): LiveSetSubscription {\n    const liveSet = this;\n\n    let observer;\n    if (typeof observerOrOnNext === 'function') {\n      observer = {\n        next: observerOrOnNext,\n        error: onError,\n        complete: onComplete\n      };\n    } else {\n      observer = observerOrOnNext;\n    }\n\n    (observer: LiveSetObserver<T>);\n\n    if (this._ended) {\n      const subscription = {\n        closed: false,\n        unsubscribe: () => {\n          subscription.closed = true;\n        },\n        pullChanges: () => {}\n      };\n      if (observer.start) {\n        observer.start(subscription);\n      }\n      if (!subscription.closed) {\n        if (this._endedWithError) {\n          if (observer.error) {\n            observer.error(this._error);\n          }\n        } else {\n          if (observer.complete) {\n            observer.complete();\n          }\n        }\n      }\n      subscription.closed = true;\n      return subscription;\n    }\n\n    const observerRecord = {observer, ignore: this._changeQueue.length};\n\n    let isStarting = true;\n    let unsubscribedInStart = false;\n    const subscription = {\n      /*:: closed: false&&` */ get closed() {\n        return !isStarting && liveSet._observers.indexOf(observerRecord) < 0;\n      }/*:: ` */,\n      unsubscribe: () => {\n        if (isStarting) {\n          unsubscribedInStart = true;\n          return;\n        }\n        const ix = this._observers.indexOf(observerRecord);\n        if (ix >= 0) {\n          this._observers.splice(ix, 1);\n          if (!this._ended && this._observers.length === 0) {\n            this._values = null;\n            this._deactivate();\n          }\n        }\n      },\n      pullChanges: () => {\n        if (this._active && this._active.listenHandler && this._active.listenHandler.pullChanges) {\n          this._active.listenHandler.pullChanges();\n        }\n        const changeQueueLength = this._changeQueue.length;\n        const originalNext = observer.next;\n        if (changeQueueLength !== 0 && originalNext) {\n          const changesToDeliver = this._changeQueue.slice(observerRecord.ignore);\n          if (changesToDeliver.length !== 0) {\n            observerRecord.ignore = changeQueueLength;\n            originalNext.call(observer, changesToDeliver);\n          }\n        }\n      }\n    };\n\n    if (!this._active) {\n      const controller: LiveSetController<T> = {\n        // Flow doesn't support getters and setters yet\n        /*:: closed: false&&` */ get closed() {\n          return !liveSet._active || liveSet._active.controller !== this;\n        }/*:: ` */,\n        add: value => {\n          let values = this._values;\n          if (!values) throw new Error('setValue must be called before controller is used');\n          if (!this._ended && !values.has(value)) {\n            if (!this._mutableValues) {\n              this._values = values = new Set(values);\n              this._mutableValues = true;\n            }\n            values.add(value);\n            this._queueChange({type: 'add', value});\n          }\n        },\n        remove: value => {\n          let values = this._values;\n          if (!values) throw new Error('setValue must be called before controller is used');\n          if (!this._ended && values.has(value)) {\n            if (!this._mutableValues) {\n              this._values = values = new Set(values);\n              this._mutableValues = true;\n            }\n            values.delete(value);\n            this._queueChange({type: 'remove', value});\n          }\n        },\n        error: err => {\n          if (this._ended) return;\n          this._ended = true;\n          this._endedWithError = true;\n          this._error = err;\n          this._queueChange();\n          this._deactivate();\n        },\n        end: () => {\n          if (this._ended) return;\n          this._ended = true;\n          this._queueChange();\n          this._deactivate();\n        }\n      };\n      const active = this._active = {\n        controller,\n        listenHandler: {\n          unsubscribe: () => {}\n        }\n      };\n      const setValuesError: Function = () => {\n        throw new Error('setValues must be called once during listen');\n      };\n      let setValues = values => {\n        setValues = setValuesError;\n        makeSetImmutable(values);\n        this._values = values;\n        this._mutableValues = false;\n      };\n      const listenHandlerOrFunction = this._init.listen(values => setValues(values), controller);\n      if (!this._values) {\n        setValuesError();\n      }\n      if (typeof listenHandlerOrFunction === 'function') {\n        active.listenHandler = {\n          unsubscribe: listenHandlerOrFunction\n        };\n      } else if (listenHandlerOrFunction != null && typeof listenHandlerOrFunction.unsubscribe === 'function') {\n        active.listenHandler = listenHandlerOrFunction;\n      } else if (listenHandlerOrFunction != null) {\n        throw new TypeError('listen must return object with unsubscribe method, a function, or null');\n      }\n      if (controller.closed) {\n        this._active = active;\n        this._deactivate();\n      }\n    }\n\n    if (observer.start) {\n      this._inSubscriptionStart = true;\n      observer.start(subscription);\n      this._inSubscriptionStart = false;\n    }\n    isStarting = false;\n\n    observerRecord.ignore = this._changeQueue.length;\n    if (!unsubscribedInStart) {\n      this._observers.push(observerRecord);\n    }\n\n    return subscription;\n  }\n}\n\n// Assign here because Flow doesn't support computed property keys on classes:\n// https://github.com/facebook/flow/issues/2286\n(LiveSet:any).prototype[$$observable] = function() {\n  return this;\n};\n\nfunction makeSetImmutable(set: Set<any>) {\n  if (process.env.NODE_ENV !== 'production') {\n    (set:any).add = (set:any).delete = (set:any).clear = readOnly;\n  }\n}\n\nfunction readOnly() {\n  throw new Error('Do not modify Set passed to or from LiveSet: Set is read-only in development');\n}\n"]}