pdfjs-dist/lib/web/pdf_link_service.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.SimpleLinkService = exports.PDFLinkService = void 0;

var _ui_utils = require("./ui_utils");

function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

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 PDFLinkService =
/*#__PURE__*/
function () {
  function PDFLinkService() {
    var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
        eventBus = _ref.eventBus,
        _ref$externalLinkTarg = _ref.externalLinkTarget,
        externalLinkTarget = _ref$externalLinkTarg === void 0 ? null : _ref$externalLinkTarg,
        _ref$externalLinkRel = _ref.externalLinkRel,
        externalLinkRel = _ref$externalLinkRel === void 0 ? null : _ref$externalLinkRel,
        _ref$externalLinkEnab = _ref.externalLinkEnabled,
        externalLinkEnabled = _ref$externalLinkEnab === void 0 ? true : _ref$externalLinkEnab;

    _classCallCheck(this, PDFLinkService);

    this.eventBus = eventBus || (0, _ui_utils.getGlobalEventBus)();
    this.externalLinkTarget = externalLinkTarget;
    this.externalLinkRel = externalLinkRel;
    this.externalLinkEnabled = externalLinkEnabled;
    this.baseUrl = null;
    this.pdfDocument = null;
    this.pdfViewer = null;
    this.pdfHistory = null;
    this._pagesRefCache = null;
  }

  _createClass(PDFLinkService, [{
    key: "setDocument",
    value: function setDocument(pdfDocument) {
      var baseUrl = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;
      this.baseUrl = baseUrl;
      this.pdfDocument = pdfDocument;
      this._pagesRefCache = Object.create(null);
    }
  }, {
    key: "setViewer",
    value: function setViewer(pdfViewer) {
      this.pdfViewer = pdfViewer;
    }
  }, {
    key: "setHistory",
    value: function setHistory(pdfHistory) {
      this.pdfHistory = pdfHistory;
    }
  }, {
    key: "navigateTo",
    value: function navigateTo(dest) {
      var _this = this;

      var goToDestination = function goToDestination(_ref2) {
        var namedDest = _ref2.namedDest,
            explicitDest = _ref2.explicitDest;
        var destRef = explicitDest[0],
            pageNumber;

        if (destRef instanceof Object) {
          pageNumber = _this._cachedPageNumber(destRef);

          if (pageNumber === null) {
            _this.pdfDocument.getPageIndex(destRef).then(function (pageIndex) {
              _this.cachePageRef(pageIndex + 1, destRef);

              goToDestination({
                namedDest: namedDest,
                explicitDest: explicitDest
              });
            })["catch"](function () {
              console.error("PDFLinkService.navigateTo: \"".concat(destRef, "\" is not ") + "a valid page reference, for dest=\"".concat(dest, "\"."));
            });

            return;
          }
        } else if (Number.isInteger(destRef)) {
          pageNumber = destRef + 1;
        } else {
          console.error("PDFLinkService.navigateTo: \"".concat(destRef, "\" is not ") + "a valid destination reference, for dest=\"".concat(dest, "\"."));
          return;
        }

        if (!pageNumber || pageNumber < 1 || pageNumber > _this.pagesCount) {
          console.error("PDFLinkService.navigateTo: \"".concat(pageNumber, "\" is not ") + "a valid page number, for dest=\"".concat(dest, "\"."));
          return;
        }

        if (_this.pdfHistory) {
          _this.pdfHistory.pushCurrentPosition();

          _this.pdfHistory.push({
            namedDest: namedDest,
            explicitDest: explicitDest,
            pageNumber: pageNumber
          });
        }

        _this.pdfViewer.scrollPageIntoView({
          pageNumber: pageNumber,
          destArray: explicitDest
        });
      };

      new Promise(function (resolve, reject) {
        if (typeof dest === 'string') {
          _this.pdfDocument.getDestination(dest).then(function (destArray) {
            resolve({
              namedDest: dest,
              explicitDest: destArray
            });
          });

          return;
        }

        resolve({
          namedDest: '',
          explicitDest: dest
        });
      }).then(function (data) {
        if (!Array.isArray(data.explicitDest)) {
          console.error("PDFLinkService.navigateTo: \"".concat(data.explicitDest, "\" is") + " not a valid destination array, for dest=\"".concat(dest, "\"."));
          return;
        }

        goToDestination(data);
      });
    }
  }, {
    key: "getDestinationHash",
    value: function getDestinationHash(dest) {
      if (typeof dest === 'string') {
        return this.getAnchorUrl('#' + escape(dest));
      }

      if (Array.isArray(dest)) {
        var str = JSON.stringify(dest);
        return this.getAnchorUrl('#' + escape(str));
      }

      return this.getAnchorUrl('');
    }
  }, {
    key: "getAnchorUrl",
    value: function getAnchorUrl(anchor) {
      return (this.baseUrl || '') + anchor;
    }
  }, {
    key: "setHash",
    value: function setHash(hash) {
      var pageNumber, dest;

      if (hash.includes('=')) {
        var params = (0, _ui_utils.parseQueryString)(hash);

        if ('search' in params) {
          this.eventBus.dispatch('findfromurlhash', {
            source: this,
            query: params['search'].replace(/"/g, ''),
            phraseSearch: params['phrase'] === 'true'
          });
        }

        if ('nameddest' in params) {
          this.navigateTo(params.nameddest);
          return;
        }

        if ('page' in params) {
          pageNumber = params.page | 0 || 1;
        }

        if ('zoom' in params) {
          var zoomArgs = params.zoom.split(',');
          var zoomArg = zoomArgs[0];
          var zoomArgNumber = parseFloat(zoomArg);

          if (!zoomArg.includes('Fit')) {
            dest = [null, {
              name: 'XYZ'
            }, zoomArgs.length > 1 ? zoomArgs[1] | 0 : null, zoomArgs.length > 2 ? zoomArgs[2] | 0 : null, zoomArgNumber ? zoomArgNumber / 100 : zoomArg];
          } else {
            if (zoomArg === 'Fit' || zoomArg === 'FitB') {
              dest = [null, {
                name: zoomArg
              }];
            } else if (zoomArg === 'FitH' || zoomArg === 'FitBH' || zoomArg === 'FitV' || zoomArg === 'FitBV') {
              dest = [null, {
                name: zoomArg
              }, zoomArgs.length > 1 ? zoomArgs[1] | 0 : null];
            } else if (zoomArg === 'FitR') {
              if (zoomArgs.length !== 5) {
                console.error('PDFLinkService.setHash: Not enough parameters for "FitR".');
              } else {
                dest = [null, {
                  name: zoomArg
                }, zoomArgs[1] | 0, zoomArgs[2] | 0, zoomArgs[3] | 0, zoomArgs[4] | 0];
              }
            } else {
              console.error("PDFLinkService.setHash: \"".concat(zoomArg, "\" is not ") + 'a valid zoom value.');
            }
          }
        }

        if (dest) {
          this.pdfViewer.scrollPageIntoView({
            pageNumber: pageNumber || this.page,
            destArray: dest,
            allowNegativeOffset: true
          });
        } else if (pageNumber) {
          this.page = pageNumber;
        }

        if ('pagemode' in params) {
          this.eventBus.dispatch('pagemode', {
            source: this,
            mode: params.pagemode
          });
        }
      } else {
        dest = unescape(hash);

        try {
          dest = JSON.parse(dest);

          if (!Array.isArray(dest)) {
            dest = dest.toString();
          }
        } catch (ex) {}

        if (typeof dest === 'string' || isValidExplicitDestination(dest)) {
          this.navigateTo(dest);
          return;
        }

        console.error("PDFLinkService.setHash: \"".concat(unescape(hash), "\" is not ") + 'a valid destination.');
      }
    }
  }, {
    key: "executeNamedAction",
    value: function executeNamedAction(action) {
      switch (action) {
        case 'GoBack':
          if (this.pdfHistory) {
            this.pdfHistory.back();
          }

          break;

        case 'GoForward':
          if (this.pdfHistory) {
            this.pdfHistory.forward();
          }

          break;

        case 'NextPage':
          if (this.page < this.pagesCount) {
            this.page++;
          }

          break;

        case 'PrevPage':
          if (this.page > 1) {
            this.page--;
          }

          break;

        case 'LastPage':
          this.page = this.pagesCount;
          break;

        case 'FirstPage':
          this.page = 1;
          break;

        default:
          break;
      }

      this.eventBus.dispatch('namedaction', {
        source: this,
        action: action
      });
    }
  }, {
    key: "cachePageRef",
    value: function cachePageRef(pageNum, pageRef) {
      if (!pageRef) {
        return;
      }

      var refStr = pageRef.gen === 0 ? "".concat(pageRef.num, "R") : "".concat(pageRef.num, "R").concat(pageRef.gen);
      this._pagesRefCache[refStr] = pageNum;
    }
  }, {
    key: "_cachedPageNumber",
    value: function _cachedPageNumber(pageRef) {
      var refStr = pageRef.gen === 0 ? "".concat(pageRef.num, "R") : "".concat(pageRef.num, "R").concat(pageRef.gen);
      return this._pagesRefCache && this._pagesRefCache[refStr] || null;
    }
  }, {
    key: "isPageVisible",
    value: function isPageVisible(pageNumber) {
      return this.pdfViewer.isPageVisible(pageNumber);
    }
  }, {
    key: "pagesCount",
    get: function get() {
      return this.pdfDocument ? this.pdfDocument.numPages : 0;
    }
  }, {
    key: "page",
    get: function get() {
      return this.pdfViewer.currentPageNumber;
    },
    set: function set(value) {
      this.pdfViewer.currentPageNumber = value;
    }
  }, {
    key: "rotation",
    get: function get() {
      return this.pdfViewer.pagesRotation;
    },
    set: function set(value) {
      this.pdfViewer.pagesRotation = value;
    }
  }]);

  return PDFLinkService;
}();

exports.PDFLinkService = PDFLinkService;

function isValidExplicitDestination(dest) {
  if (!Array.isArray(dest)) {
    return false;
  }

  var destLength = dest.length,
      allowNull = true;

  if (destLength < 2) {
    return false;
  }

  var page = dest[0];

  if (!(_typeof(page) === 'object' && Number.isInteger(page.num) && Number.isInteger(page.gen)) && !(Number.isInteger(page) && page >= 0)) {
    return false;
  }

  var zoom = dest[1];

  if (!(_typeof(zoom) === 'object' && typeof zoom.name === 'string')) {
    return false;
  }

  switch (zoom.name) {
    case 'XYZ':
      if (destLength !== 5) {
        return false;
      }

      break;

    case 'Fit':
    case 'FitB':
      return destLength === 2;

    case 'FitH':
    case 'FitBH':
    case 'FitV':
    case 'FitBV':
      if (destLength !== 3) {
        return false;
      }

      break;

    case 'FitR':
      if (destLength !== 6) {
        return false;
      }

      allowNull = false;
      break;

    default:
      return false;
  }

  for (var i = 2; i < destLength; i++) {
    var param = dest[i];

    if (!(typeof param === 'number' || allowNull && param === null)) {
      return false;
    }
  }

  return true;
}

var SimpleLinkService =
/*#__PURE__*/
function () {
  function SimpleLinkService() {
    _classCallCheck(this, SimpleLinkService);

    this.externalLinkTarget = null;
    this.externalLinkRel = null;
    this.externalLinkEnabled = true;
  }

  _createClass(SimpleLinkService, [{
    key: "navigateTo",
    value: function navigateTo(dest) {}
  }, {
    key: "getDestinationHash",
    value: function getDestinationHash(dest) {
      return '#';
    }
  }, {
    key: "getAnchorUrl",
    value: function getAnchorUrl(hash) {
      return '#';
    }
  }, {
    key: "setHash",
    value: function setHash(hash) {}
  }, {
    key: "executeNamedAction",
    value: function executeNamedAction(action) {}
  }, {
    key: "cachePageRef",
    value: function cachePageRef(pageNum, pageRef) {}
  }, {
    key: "isPageVisible",
    value: function isPageVisible(pageNumber) {
      return true;
    }
  }, {
    key: "pagesCount",
    get: function get() {
      return 0;
    }
  }, {
    key: "page",
    get: function get() {
      return 0;
    },
    set: function set(value) {}
  }, {
    key: "rotation",
    get: function get() {
      return 0;
    },
    set: function set(value) {}
  }]);

  return SimpleLinkService;
}();

exports.SimpleLinkService = SimpleLinkService;