@protobi/exceljs/dist/es5/utils/stream-base64.js

Excel Workbook Manager - Temporary fork with pivot table enhancements and bug fixes pending upstream merge

"use strict";

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 Stream = require('readable-stream');

// =============================================================================
// StreamBase64 - A utility to convert to/from base64 stream
// Note: does not buffer data, must be piped
var StreamBase64 = /*#__PURE__*/function (_Stream$Duplex) {
  _inherits(StreamBase64, _Stream$Duplex);
  var _super = _createSuper(StreamBase64);
  function StreamBase64() {
    var _this;
    _classCallCheck(this, StreamBase64);
    _this = _super.call(this);

    // consuming pipe streams go here
    _this.pipes = [];
    return _this;
  }

  // writable
  // event drain - if write returns false (which it won't), indicates when safe to write again.
  // finish - end() has been called
  // pipe(src) - pipe() has been called on readable
  // unpipe(src) - unpipe() has been called on readable
  // error - duh
  _createClass(StreamBase64, [{
    key: "write",
    value: function write(/* data, encoding */
    ) {
      return true;
    }
  }, {
    key: "cork",
    value: function cork() {}
  }, {
    key: "uncork",
    value: function uncork() {}
  }, {
    key: "end",
    value: function end(/* chunk, encoding, callback */) {}

    // readable
    // event readable - some data is now available
    // event data - switch to flowing mode - feeds chunks to handler
    // event end - no more data
    // event close - optional, indicates upstream close
    // event error - duh
  }, {
    key: "read",
    value: function read(/* size */) {}
  }, {
    key: "setEncoding",
    value: function setEncoding(encoding) {
      // causes stream.read or stream.on('data) to return strings of encoding instead of Buffer objects
      this.encoding = encoding;
    }
  }, {
    key: "pause",
    value: function pause() {}
  }, {
    key: "resume",
    value: function resume() {}
  }, {
    key: "isPaused",
    value: function isPaused() {}
  }, {
    key: "pipe",
    value: function pipe(destination) {
      // add destination to pipe list & write current buffer
      this.pipes.push(destination);
    }
  }, {
    key: "unpipe",
    value: function unpipe(destination) {
      // remove destination from pipe list
      this.pipes = this.pipes.filter(function (pipe) {
        return pipe !== destination;
      });
    }
  }, {
    key: "unshift",
    value: function unshift(/* chunk */
    ) {
      // some numpty has read some data that's not for them and they want to put it back!
      // Might implement this some day
      throw new Error('Not Implemented');
    }
  }, {
    key: "wrap",
    value: function wrap(/* stream */
    ) {
      // not implemented
      throw new Error('Not Implemented');
    }
  }]);
  return StreamBase64;
}(Stream.Duplex);
module.exports = StreamBase64;
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