pdfjs-dist/lib/web/view_history.js

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2019 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @licend The above is the entire license notice for the
 * Javascript code in this page
 */
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.ViewHistory = void 0;

var _regenerator = _interopRequireDefault(require("@babel/runtime/regenerator"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }

function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { Promise.resolve(value).then(_next, _throw); } }

function _asyncToGenerator(fn) { return function () { var self = this, args = arguments; return new Promise(function (resolve, reject) { var gen = fn.apply(self, args); function _next(value) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value); } function _throw(err) { asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err); } _next(undefined); }); }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

var DEFAULT_VIEW_HISTORY_CACHE_SIZE = 20;

var ViewHistory =
/*#__PURE__*/
function () {
  function ViewHistory(fingerprint) {
    var _this = this;

    var cacheSize = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : DEFAULT_VIEW_HISTORY_CACHE_SIZE;

    _classCallCheck(this, ViewHistory);

    this.fingerprint = fingerprint;
    this.cacheSize = cacheSize;
    this._initializedPromise = this._readFromStorage().then(function (databaseStr) {
      var database = JSON.parse(databaseStr || '{}');

      if (!('files' in database)) {
        database.files = [];
      } else {
        while (database.files.length >= _this.cacheSize) {
          database.files.shift();
        }
      }

      var index = -1;

      for (var i = 0, length = database.files.length; i < length; i++) {
        var branch = database.files[i];

        if (branch.fingerprint === _this.fingerprint) {
          index = i;
          break;
        }
      }

      if (index === -1) {
        index = database.files.push({
          fingerprint: _this.fingerprint
        }) - 1;
      }

      _this.file = database.files[index];
      _this.database = database;
    });
  }

  _createClass(ViewHistory, [{
    key: "_writeToStorage",
    value: function () {
      var _writeToStorage2 = _asyncToGenerator(
      /*#__PURE__*/
      _regenerator["default"].mark(function _callee() {
        var databaseStr;
        return _regenerator["default"].wrap(function _callee$(_context) {
          while (1) {
            switch (_context.prev = _context.next) {
              case 0:
                databaseStr = JSON.stringify(this.database);
                localStorage.setItem('pdfjs.history', databaseStr);

              case 2:
              case "end":
                return _context.stop();
            }
          }
        }, _callee, this);
      }));

      function _writeToStorage() {
        return _writeToStorage2.apply(this, arguments);
      }

      return _writeToStorage;
    }()
  }, {
    key: "_readFromStorage",
    value: function () {
      var _readFromStorage2 = _asyncToGenerator(
      /*#__PURE__*/
      _regenerator["default"].mark(function _callee2() {
        return _regenerator["default"].wrap(function _callee2$(_context2) {
          while (1) {
            switch (_context2.prev = _context2.next) {
              case 0:
                return _context2.abrupt("return", localStorage.getItem('pdfjs.history'));

              case 1:
              case "end":
                return _context2.stop();
            }
          }
        }, _callee2);
      }));

      function _readFromStorage() {
        return _readFromStorage2.apply(this, arguments);
      }

      return _readFromStorage;
    }()
  }, {
    key: "set",
    value: function () {
      var _set = _asyncToGenerator(
      /*#__PURE__*/
      _regenerator["default"].mark(function _callee3(name, val) {
        return _regenerator["default"].wrap(function _callee3$(_context3) {
          while (1) {
            switch (_context3.prev = _context3.next) {
              case 0:
                _context3.next = 2;
                return this._initializedPromise;

              case 2:
                this.file[name] = val;
                return _context3.abrupt("return", this._writeToStorage());

              case 4:
              case "end":
                return _context3.stop();
            }
          }
        }, _callee3, this);
      }));

      function set(_x, _x2) {
        return _set.apply(this, arguments);
      }

      return set;
    }()
  }, {
    key: "setMultiple",
    value: function () {
      var _setMultiple = _asyncToGenerator(
      /*#__PURE__*/
      _regenerator["default"].mark(function _callee4(properties) {
        var name;
        return _regenerator["default"].wrap(function _callee4$(_context4) {
          while (1) {
            switch (_context4.prev = _context4.next) {
              case 0:
                _context4.next = 2;
                return this._initializedPromise;

              case 2:
                for (name in properties) {
                  this.file[name] = properties[name];
                }

                return _context4.abrupt("return", this._writeToStorage());

              case 4:
              case "end":
                return _context4.stop();
            }
          }
        }, _callee4, this);
      }));

      function setMultiple(_x3) {
        return _setMultiple.apply(this, arguments);
      }

      return setMultiple;
    }()
  }, {
    key: "get",
    value: function () {
      var _get = _asyncToGenerator(
      /*#__PURE__*/
      _regenerator["default"].mark(function _callee5(name, defaultValue) {
        var val;
        return _regenerator["default"].wrap(function _callee5$(_context5) {
          while (1) {
            switch (_context5.prev = _context5.next) {
              case 0:
                _context5.next = 2;
                return this._initializedPromise;

              case 2:
                val = this.file[name];
                return _context5.abrupt("return", val !== undefined ? val : defaultValue);

              case 4:
              case "end":
                return _context5.stop();
            }
          }
        }, _callee5, this);
      }));

      function get(_x4, _x5) {
        return _get.apply(this, arguments);
      }

      return get;
    }()
  }, {
    key: "getMultiple",
    value: function () {
      var _getMultiple = _asyncToGenerator(
      /*#__PURE__*/
      _regenerator["default"].mark(function _callee6(properties) {
        var values, name, val;
        return _regenerator["default"].wrap(function _callee6$(_context6) {
          while (1) {
            switch (_context6.prev = _context6.next) {
              case 0:
                _context6.next = 2;
                return this._initializedPromise;

              case 2:
                values = Object.create(null);

                for (name in properties) {
                  val = this.file[name];
                  values[name] = val !== undefined ? val : properties[name];
                }

                return _context6.abrupt("return", values);

              case 5:
              case "end":
                return _context6.stop();
            }
          }
        }, _callee6, this);
      }));

      function getMultiple(_x6) {
        return _getMultiple.apply(this, arguments);
      }

      return getMultiple;
    }()
  }]);

  return ViewHistory;
}();

exports.ViewHistory = ViewHistory;