pdfjs-dist/lib/display/dom_utils.js

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2018 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.addLinkAttributes = addLinkAttributes;
exports.getFilenameFromUrl = getFilenameFromUrl;
exports.loadScript = loadScript;
exports.DummyStatTimer = exports.StatTimer = exports.DOMSVGFactory = exports.DOMCMapReaderFactory = exports.DOMCanvasFactory = exports.DEFAULT_LINK_REL = exports.LinkTarget = exports.RenderingCancelledException = exports.PageViewport = void 0;

var _util = require("../shared/util");

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_LINK_REL = 'noopener noreferrer nofollow';
exports.DEFAULT_LINK_REL = DEFAULT_LINK_REL;
var SVG_NS = 'http://www.w3.org/2000/svg';

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

  _createClass(DOMCanvasFactory, [{
    key: "create",
    value: function create(width, height) {
      if (width <= 0 || height <= 0) {
        throw new Error('invalid canvas size');
      }

      var canvas = document.createElement('canvas');
      var context = canvas.getContext('2d');
      canvas.width = width;
      canvas.height = height;
      return {
        canvas: canvas,
        context: context
      };
    }
  }, {
    key: "reset",
    value: function reset(canvasAndContext, width, height) {
      if (!canvasAndContext.canvas) {
        throw new Error('canvas is not specified');
      }

      if (width <= 0 || height <= 0) {
        throw new Error('invalid canvas size');
      }

      canvasAndContext.canvas.width = width;
      canvasAndContext.canvas.height = height;
    }
  }, {
    key: "destroy",
    value: function destroy(canvasAndContext) {
      if (!canvasAndContext.canvas) {
        throw new Error('canvas is not specified');
      }

      canvasAndContext.canvas.width = 0;
      canvasAndContext.canvas.height = 0;
      canvasAndContext.canvas = null;
      canvasAndContext.context = null;
    }
  }]);

  return DOMCanvasFactory;
}();

exports.DOMCanvasFactory = DOMCanvasFactory;

var DOMCMapReaderFactory =
/*#__PURE__*/
function () {
  function DOMCMapReaderFactory(_ref) {
    var _ref$baseUrl = _ref.baseUrl,
        baseUrl = _ref$baseUrl === void 0 ? null : _ref$baseUrl,
        _ref$isCompressed = _ref.isCompressed,
        isCompressed = _ref$isCompressed === void 0 ? false : _ref$isCompressed;

    _classCallCheck(this, DOMCMapReaderFactory);

    this.baseUrl = baseUrl;
    this.isCompressed = isCompressed;
  }

  _createClass(DOMCMapReaderFactory, [{
    key: "fetch",
    value: function fetch(_ref2) {
      var _this = this;

      var name = _ref2.name;

      if (!this.baseUrl) {
        return Promise.reject(new Error('The CMap "baseUrl" parameter must be specified, ensure that ' + 'the "cMapUrl" and "cMapPacked" API parameters are provided.'));
      }

      if (!name) {
        return Promise.reject(new Error('CMap name must be specified.'));
      }

      return new Promise(function (resolve, reject) {
        var url = _this.baseUrl + name + (_this.isCompressed ? '.bcmap' : '');
        var request = new XMLHttpRequest();
        request.open('GET', url, true);

        if (_this.isCompressed) {
          request.responseType = 'arraybuffer';
        }

        request.onreadystatechange = function () {
          if (request.readyState !== XMLHttpRequest.DONE) {
            return;
          }

          if (request.status === 200 || request.status === 0) {
            var data;

            if (_this.isCompressed && request.response) {
              data = new Uint8Array(request.response);
            } else if (!_this.isCompressed && request.responseText) {
              data = (0, _util.stringToBytes)(request.responseText);
            }

            if (data) {
              resolve({
                cMapData: data,
                compressionType: _this.isCompressed ? _util.CMapCompressionType.BINARY : _util.CMapCompressionType.NONE
              });
              return;
            }
          }

          reject(new Error('Unable to load ' + (_this.isCompressed ? 'binary ' : '') + 'CMap at: ' + url));
        };

        request.send(null);
      });
    }
  }]);

  return DOMCMapReaderFactory;
}();

exports.DOMCMapReaderFactory = DOMCMapReaderFactory;

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

  _createClass(DOMSVGFactory, [{
    key: "create",
    value: function create(width, height) {
      (0, _util.assert)(width > 0 && height > 0, 'Invalid SVG dimensions');
      var svg = document.createElementNS(SVG_NS, 'svg:svg');
      svg.setAttribute('version', '1.1');
      svg.setAttribute('width', width + 'px');
      svg.setAttribute('height', height + 'px');
      svg.setAttribute('preserveAspectRatio', 'none');
      svg.setAttribute('viewBox', '0 0 ' + width + ' ' + height);
      return svg;
    }
  }, {
    key: "createElement",
    value: function createElement(type) {
      (0, _util.assert)(typeof type === 'string', 'Invalid SVG element type');
      return document.createElementNS(SVG_NS, type);
    }
  }]);

  return DOMSVGFactory;
}();

exports.DOMSVGFactory = DOMSVGFactory;

var PageViewport =
/*#__PURE__*/
function () {
  function PageViewport(_ref3) {
    var viewBox = _ref3.viewBox,
        scale = _ref3.scale,
        rotation = _ref3.rotation,
        _ref3$offsetX = _ref3.offsetX,
        offsetX = _ref3$offsetX === void 0 ? 0 : _ref3$offsetX,
        _ref3$offsetY = _ref3.offsetY,
        offsetY = _ref3$offsetY === void 0 ? 0 : _ref3$offsetY,
        _ref3$dontFlip = _ref3.dontFlip,
        dontFlip = _ref3$dontFlip === void 0 ? false : _ref3$dontFlip;

    _classCallCheck(this, PageViewport);

    this.viewBox = viewBox;
    this.scale = scale;
    this.rotation = rotation;
    this.offsetX = offsetX;
    this.offsetY = offsetY;
    var centerX = (viewBox[2] + viewBox[0]) / 2;
    var centerY = (viewBox[3] + viewBox[1]) / 2;
    var rotateA, rotateB, rotateC, rotateD;
    rotation = rotation % 360;
    rotation = rotation < 0 ? rotation + 360 : rotation;

    switch (rotation) {
      case 180:
        rotateA = -1;
        rotateB = 0;
        rotateC = 0;
        rotateD = 1;
        break;

      case 90:
        rotateA = 0;
        rotateB = 1;
        rotateC = 1;
        rotateD = 0;
        break;

      case 270:
        rotateA = 0;
        rotateB = -1;
        rotateC = -1;
        rotateD = 0;
        break;

      default:
        rotateA = 1;
        rotateB = 0;
        rotateC = 0;
        rotateD = -1;
        break;
    }

    if (dontFlip) {
      rotateC = -rotateC;
      rotateD = -rotateD;
    }

    var offsetCanvasX, offsetCanvasY;
    var width, height;

    if (rotateA === 0) {
      offsetCanvasX = Math.abs(centerY - viewBox[1]) * scale + offsetX;
      offsetCanvasY = Math.abs(centerX - viewBox[0]) * scale + offsetY;
      width = Math.abs(viewBox[3] - viewBox[1]) * scale;
      height = Math.abs(viewBox[2] - viewBox[0]) * scale;
    } else {
      offsetCanvasX = Math.abs(centerX - viewBox[0]) * scale + offsetX;
      offsetCanvasY = Math.abs(centerY - viewBox[1]) * scale + offsetY;
      width = Math.abs(viewBox[2] - viewBox[0]) * scale;
      height = Math.abs(viewBox[3] - viewBox[1]) * scale;
    }

    this.transform = [rotateA * scale, rotateB * scale, rotateC * scale, rotateD * scale, offsetCanvasX - rotateA * scale * centerX - rotateC * scale * centerY, offsetCanvasY - rotateB * scale * centerX - rotateD * scale * centerY];
    this.width = width;
    this.height = height;
  }

  _createClass(PageViewport, [{
    key: "clone",
    value: function clone() {
      var _ref4 = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
          _ref4$scale = _ref4.scale,
          scale = _ref4$scale === void 0 ? this.scale : _ref4$scale,
          _ref4$rotation = _ref4.rotation,
          rotation = _ref4$rotation === void 0 ? this.rotation : _ref4$rotation,
          _ref4$dontFlip = _ref4.dontFlip,
          dontFlip = _ref4$dontFlip === void 0 ? false : _ref4$dontFlip;

      return new PageViewport({
        viewBox: this.viewBox.slice(),
        scale: scale,
        rotation: rotation,
        offsetX: this.offsetX,
        offsetY: this.offsetY,
        dontFlip: dontFlip
      });
    }
  }, {
    key: "convertToViewportPoint",
    value: function convertToViewportPoint(x, y) {
      return _util.Util.applyTransform([x, y], this.transform);
    }
  }, {
    key: "convertToViewportRectangle",
    value: function convertToViewportRectangle(rect) {
      var tl = _util.Util.applyTransform([rect[0], rect[1]], this.transform);

      var br = _util.Util.applyTransform([rect[2], rect[3]], this.transform);

      return [tl[0], tl[1], br[0], br[1]];
    }
  }, {
    key: "convertToPdfPoint",
    value: function convertToPdfPoint(x, y) {
      return _util.Util.applyInverseTransform([x, y], this.transform);
    }
  }]);

  return PageViewport;
}();

exports.PageViewport = PageViewport;

var RenderingCancelledException = function RenderingCancelledException() {
  function RenderingCancelledException(msg, type) {
    this.message = msg;
    this.type = type;
  }

  RenderingCancelledException.prototype = new Error();
  RenderingCancelledException.prototype.name = 'RenderingCancelledException';
  RenderingCancelledException.constructor = RenderingCancelledException;
  return RenderingCancelledException;
}();

exports.RenderingCancelledException = RenderingCancelledException;
var LinkTarget = {
  NONE: 0,
  SELF: 1,
  BLANK: 2,
  PARENT: 3,
  TOP: 4
};
exports.LinkTarget = LinkTarget;
var LinkTargetStringMap = ['', '_self', '_blank', '_parent', '_top'];

function addLinkAttributes(link) {
  var _ref5 = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},
      url = _ref5.url,
      target = _ref5.target,
      rel = _ref5.rel;

  link.href = link.title = url ? (0, _util.removeNullCharacters)(url) : '';

  if (url) {
    var LinkTargetValues = Object.values(LinkTarget);
    var targetIndex = LinkTargetValues.includes(target) ? target : LinkTarget.NONE;
    link.target = LinkTargetStringMap[targetIndex];
    link.rel = typeof rel === 'string' ? rel : DEFAULT_LINK_REL;
  }
}

function getFilenameFromUrl(url) {
  var anchor = url.indexOf('#');
  var query = url.indexOf('?');
  var end = Math.min(anchor > 0 ? anchor : url.length, query > 0 ? query : url.length);
  return url.substring(url.lastIndexOf('/', end) + 1, end);
}

var StatTimer =
/*#__PURE__*/
function () {
  function StatTimer() {
    var enable = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : true;

    _classCallCheck(this, StatTimer);

    this.enabled = !!enable;
    this.started = Object.create(null);
    this.times = [];
  }

  _createClass(StatTimer, [{
    key: "time",
    value: function time(name) {
      if (!this.enabled) {
        return;
      }

      if (name in this.started) {
        (0, _util.warn)('Timer is already running for ' + name);
      }

      this.started[name] = Date.now();
    }
  }, {
    key: "timeEnd",
    value: function timeEnd(name) {
      if (!this.enabled) {
        return;
      }

      if (!(name in this.started)) {
        (0, _util.warn)('Timer has not been started for ' + name);
      }

      this.times.push({
        'name': name,
        'start': this.started[name],
        'end': Date.now()
      });
      delete this.started[name];
    }
  }, {
    key: "toString",
    value: function toString() {
      var times = this.times;
      var out = '',
          longest = 0;

      for (var i = 0, ii = times.length; i < ii; ++i) {
        var name = times[i]['name'];

        if (name.length > longest) {
          longest = name.length;
        }
      }

      for (var _i = 0, _ii = times.length; _i < _ii; ++_i) {
        var span = times[_i];
        var duration = span.end - span.start;
        out += "".concat(span['name'].padEnd(longest), " ").concat(duration, "ms\n");
      }

      return out;
    }
  }]);

  return StatTimer;
}();

exports.StatTimer = StatTimer;

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

    (0, _util.unreachable)('Cannot initialize DummyStatTimer.');
  }

  _createClass(DummyStatTimer, null, [{
    key: "time",
    value: function time(name) {}
  }, {
    key: "timeEnd",
    value: function timeEnd(name) {}
  }, {
    key: "toString",
    value: function toString() {
      return '';
    }
  }]);

  return DummyStatTimer;
}();

exports.DummyStatTimer = DummyStatTimer;

function loadScript(src) {
  return new Promise(function (resolve, reject) {
    var script = document.createElement('script');
    script.src = src;
    script.onload = resolve;

    script.onerror = function () {
      reject(new Error("Cannot load script at: ".concat(script.src)));
    };

    (document.head || document.documentElement).appendChild(script);
  });
}