@protobi/exceljs
Version:
Excel Workbook Manager - Temporary fork with pivot table enhancements and bug fixes pending upstream merge
89 lines (85 loc) • 5.06 kB
JavaScript
;
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _classCallCheck(a, n) { if (!(a instanceof n)) throw new TypeError("Cannot call a class as a function"); }
function _defineProperties(e, r) { for (var t = 0; t < r.length; t++) { var o = r[t]; o.enumerable = o.enumerable || !1, o.configurable = !0, "value" in o && (o.writable = !0), Object.defineProperty(e, _toPropertyKey(o.key), o); } }
function _createClass(e, r, t) { return r && _defineProperties(e.prototype, r), t && _defineProperties(e, t), Object.defineProperty(e, "prototype", { writable: !1 }), e; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
function _inherits(t, e) { if ("function" != typeof e && null !== e) throw new TypeError("Super expression must either be null or a function"); t.prototype = Object.create(e && e.prototype, { constructor: { value: t, writable: !0, configurable: !0 } }), Object.defineProperty(t, "prototype", { writable: !1 }), e && _setPrototypeOf(t, e); }
function _setPrototypeOf(t, e) { return _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function (t, e) { return t.__proto__ = e, t; }, _setPrototypeOf(t, e); }
function _createSuper(t) { var r = _isNativeReflectConstruct(); return function () { var e, o = _getPrototypeOf(t); if (r) { var s = _getPrototypeOf(this).constructor; e = Reflect.construct(o, arguments, s); } else e = o.apply(this, arguments); return _possibleConstructorReturn(this, e); }; }
function _possibleConstructorReturn(t, e) { if (e && ("object" == _typeof(e) || "function" == typeof e)) return e; if (void 0 !== e) throw new TypeError("Derived constructors may only return object or undefined"); return _assertThisInitialized(t); }
function _assertThisInitialized(e) { if (void 0 === e) throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); return e; }
function _isNativeReflectConstruct() { try { var t = !Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); } catch (t) {} return (_isNativeReflectConstruct = function _isNativeReflectConstruct() { return !!t; })(); }
function _getPrototypeOf(t) { return _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf.bind() : function (t) { return t.__proto__ || Object.getPrototypeOf(t); }, _getPrototypeOf(t); }
var events = require('events');
// =============================================================================
// StutteredPipe - Used to slow down streaming so GC can get a look in
var StutteredPipe = /*#__PURE__*/function (_events$EventEmitter) {
_inherits(StutteredPipe, _events$EventEmitter);
var _super = _createSuper(StutteredPipe);
function StutteredPipe(readable, writable, options) {
var _this;
_classCallCheck(this, StutteredPipe);
_this = _super.call(this);
options = options || {};
_this.readable = readable;
_this.writable = writable;
_this.bufSize = options.bufSize || 16384;
_this.autoPause = options.autoPause || false;
_this.paused = false;
_this.eod = false;
_this.scheduled = null;
readable.on('end', function () {
_this.eod = true;
writable.end();
});
// need to have some way to communicate speed of stream
// back from the consumer
readable.on('readable', function () {
if (!_this.paused) {
_this.resume();
}
});
_this._schedule();
return _this;
}
_createClass(StutteredPipe, [{
key: "pause",
value: function pause() {
this.paused = true;
}
}, {
key: "resume",
value: function resume() {
if (!this.eod) {
if (this.scheduled !== null) {
clearImmediate(this.scheduled);
}
this._schedule();
}
}
}, {
key: "_schedule",
value: function _schedule() {
var _this2 = this;
this.scheduled = setImmediate(function () {
_this2.scheduled = null;
if (!_this2.eod && !_this2.paused) {
var data = _this2.readable.read(_this2.bufSize);
if (data && data.length) {
_this2.writable.write(data);
if (!_this2.paused && !_this2.autoPause) {
_this2._schedule();
}
} else if (!_this2.paused) {
_this2._schedule();
}
}
});
}
}]);
return StutteredPipe;
}(events.EventEmitter);
module.exports = StutteredPipe;
//# sourceMappingURL=stuttered-pipe.js.map