plugin updates

wp/wp-content/plugins/wp-media-folder/assets/js/pdf-embed/compatibility.js

@@ -0,0 +1,596 @@
+/* Copyright 2012 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.
+ */
+/* globals VBArray, PDFJS */
+
+(function compatibilityWrapper() {
+  'use strict';
+
+// Initializing PDFJS global object here, it case if we need to change/disable
+// some PDF.js features, e.g. range requests
+if (typeof PDFJS === 'undefined') {
+  (typeof window !== 'undefined' ? window : this).PDFJS = {};
+}
+
+// Checking if the typed arrays are supported
+// Support: iOS<6.0 (subarray), IE<10, Android<4.0
+(function checkTypedArrayCompatibility() {
+  if (typeof Uint8Array !== 'undefined') {
+    // Support: iOS<6.0
+    if (typeof Uint8Array.prototype.subarray === 'undefined') {
+        Uint8Array.prototype.subarray = function subarray(start, end) {
+          return new Uint8Array(this.slice(start, end));
+        };
+        Float32Array.prototype.subarray = function subarray(start, end) {
+          return new Float32Array(this.slice(start, end));
+        };
+    }
+
+    // Support: Android<4.1
+    if (typeof Float64Array === 'undefined') {
+      window.Float64Array = Float32Array;
+    }
+    return;
+  }
+
+  function subarray(start, end) {
+    return new TypedArray(this.slice(start, end));
+  }
+
+  function setArrayOffset(array, offset) {
+    if (arguments.length < 2) {
+      offset = 0;
+    }
+    for (var i = 0, n = array.length; i < n; ++i, ++offset) {
+      this[offset] = array[i] & 0xFF;
+    }
+  }
+
+  function TypedArray(arg1) {
+    var result, i, n;
+    if (typeof arg1 === 'number') {
+      result = [];
+      for (i = 0; i < arg1; ++i) {
+        result[i] = 0;
+      }
+    } else if ('slice' in arg1) {
+      result = arg1.slice(0);
+    } else {
+      result = [];
+      for (i = 0, n = arg1.length; i < n; ++i) {
+        result[i] = arg1[i];
+      }
+    }
+
+    result.subarray = subarray;
+    result.buffer = result;
+    result.byteLength = result.length;
+    result.set = setArrayOffset;
+
+    if (typeof arg1 === 'object' && arg1.buffer) {
+      result.buffer = arg1.buffer;
+    }
+    return result;
+  }
+
+  window.Uint8Array = TypedArray;
+  window.Int8Array = TypedArray;
+
+  // we don't need support for set, byteLength for 32-bit array
+  // so we can use the TypedArray as well
+  window.Uint32Array = TypedArray;
+  window.Int32Array = TypedArray;
+  window.Uint16Array = TypedArray;
+  window.Float32Array = TypedArray;
+  window.Float64Array = TypedArray;
+})();
+
+// URL = URL || webkitURL
+// Support: Safari<7, Android 4.2+
+(function normalizeURLObject() {
+  if (!window.URL) {
+    window.URL = window.webkitURL;
+  }
+})();
+
+// Object.defineProperty()?
+// Support: Android<4.0, Safari<5.1
+(function checkObjectDefinePropertyCompatibility() {
+  if (typeof Object.defineProperty !== 'undefined') {
+    var definePropertyPossible = true;
+    try {
+      // some browsers (e.g. safari) cannot use defineProperty() on DOM objects
+      // and thus the native version is not sufficient
+      Object.defineProperty(new Image(), 'id', { value: 'test' });
+      // ... another test for android gb browser for non-DOM objects
+      var Test = function Test() {};
+      Test.prototype = { get id() { } };
+      Object.defineProperty(new Test(), 'id',
+        { value: '', configurable: true, enumerable: true, writable: false });
+    } catch (e) {
+      definePropertyPossible = false;
+    }
+    if (definePropertyPossible) {
+      return;
+    }
+  }
+
+  Object.defineProperty = function objectDefineProperty(obj, name, def) {
+    delete obj[name];
+    if ('get' in def) {
+      obj.__defineGetter__(name, def['get']);
+    }
+    if ('set' in def) {
+      obj.__defineSetter__(name, def['set']);
+    }
+    if ('value' in def) {
+      obj.__defineSetter__(name, function objectDefinePropertySetter(value) {
+        this.__defineGetter__(name, function objectDefinePropertyGetter() {
+          return value;
+        });
+        return value;
+      });
+      obj[name] = def.value;
+    }
+  };
+})();
+
+
+// No XMLHttpRequest#response?
+// Support: IE<11, Android <4.0
+(function checkXMLHttpRequestResponseCompatibility() {
+  var xhrPrototype = XMLHttpRequest.prototype;
+  var xhr = new XMLHttpRequest();
+  if (!('overrideMimeType' in xhr)) {
+    // IE10 might have response, but not overrideMimeType
+    // Support: IE10
+    Object.defineProperty(xhrPrototype, 'overrideMimeType', {
+      value: function xmlHttpRequestOverrideMimeType(mimeType) {}
+    });
+  }
+  if ('responseType' in xhr) {
+    return;
+  }
+
+  // The worker will be using XHR, so we can save time and disable worker.
+  PDFJS.disableWorker = true;
+
+  Object.defineProperty(xhrPrototype, 'responseType', {
+    get: function xmlHttpRequestGetResponseType() {
+      return this._responseType || 'text';
+    },
+    set: function xmlHttpRequestSetResponseType(value) {
+      if (value === 'text' || value === 'arraybuffer') {
+        this._responseType = value;
+        if (value === 'arraybuffer' &&
+            typeof this.overrideMimeType === 'function') {
+          this.overrideMimeType('text/plain; charset=x-user-defined');
+        }
+      }
+    }
+  });
+
+  // Support: IE9
+  if (typeof VBArray !== 'undefined') {
+    Object.defineProperty(xhrPrototype, 'response', {
+      get: function xmlHttpRequestResponseGet() {
+        if (this.responseType === 'arraybuffer') {
+          return new Uint8Array(new VBArray(this.responseBody).toArray());
+        } else {
+          return this.responseText;
+        }
+      }
+    });
+    return;
+  }
+
+  Object.defineProperty(xhrPrototype, 'response', {
+    get: function xmlHttpRequestResponseGet() {
+      if (this.responseType !== 'arraybuffer') {
+        return this.responseText;
+      }
+      var text = this.responseText;
+      var i, n = text.length;
+      var result = new Uint8Array(n);
+      for (i = 0; i < n; ++i) {
+        result[i] = text.charCodeAt(i) & 0xFF;
+      }
+      return result.buffer;
+    }
+  });
+})();
+
+// window.btoa (base64 encode function) ?
+// Support: IE<10
+(function checkWindowBtoaCompatibility() {
+  if ('btoa' in window) {
+    return;
+  }
+
+  var digits =
+    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
+
+  window.btoa = function windowBtoa(chars) {
+    var buffer = '';
+    var i, n;
+    for (i = 0, n = chars.length; i < n; i += 3) {
+      var b1 = chars.charCodeAt(i) & 0xFF;
+      var b2 = chars.charCodeAt(i + 1) & 0xFF;
+      var b3 = chars.charCodeAt(i + 2) & 0xFF;
+      var d1 = b1 >> 2, d2 = ((b1 & 3) << 4) | (b2 >> 4);
+      var d3 = i + 1 < n ? ((b2 & 0xF) << 2) | (b3 >> 6) : 64;
+      var d4 = i + 2 < n ? (b3 & 0x3F) : 64;
+      buffer += (digits.charAt(d1) + digits.charAt(d2) +
+                 digits.charAt(d3) + digits.charAt(d4));
+    }
+    return buffer;
+  };
+})();
+
+// window.atob (base64 encode function)?
+// Support: IE<10
+(function checkWindowAtobCompatibility() {
+  if ('atob' in window) {
+    return;
+  }
+
+  // https://github.com/davidchambers/Base64.js
+  var digits =
+    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
+  window.atob = function (input) {
+    input = input.replace(/=+$/, '');
+    if (input.length % 4 === 1) {
+      throw new Error('bad atob input');
+    }
+    for (
+      // initialize result and counters
+      var bc = 0, bs, buffer, idx = 0, output = '';
+      // get next character
+      buffer = input.charAt(idx++);
+      // character found in table?
+      // initialize bit storage and add its ascii value
+      ~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer,
+        // and if not first of each 4 characters,
+        // convert the first 8 bits to one ascii character
+        bc++ % 4) ? output += String.fromCharCode(255 & bs >> (-2 * bc & 6)) : 0
+    ) {
+      // try to find character in table (0-63, not found => -1)
+      buffer = digits.indexOf(buffer);
+    }
+    return output;
+  };
+})();
+
+// Function.prototype.bind?
+// Support: Android<4.0, iOS<6.0
+(function checkFunctionPrototypeBindCompatibility() {
+  if (typeof Function.prototype.bind !== 'undefined') {
+    return;
+  }
+
+  Function.prototype.bind = function functionPrototypeBind(obj) {
+    var fn = this, headArgs = Array.prototype.slice.call(arguments, 1);
+    var bound = function functionPrototypeBindBound() {
+      var args = headArgs.concat(Array.prototype.slice.call(arguments));
+      return fn.apply(obj, args);
+    };
+    return bound;
+  };
+})();
+
+// HTMLElement dataset property
+// Support: IE<11, Safari<5.1, Android<4.0
+(function checkDatasetProperty() {
+  var div = document.createElement('div');
+  if ('dataset' in div) {
+    return; // dataset property exists
+  }
+
+  Object.defineProperty(HTMLElement.prototype, 'dataset', {
+    get: function() {
+      if (this._dataset) {
+        return this._dataset;
+      }
+
+      var dataset = {};
+      for (var j = 0, jj = this.attributes.length; j < jj; j++) {
+        var attribute = this.attributes[j];
+        if (attribute.name.substring(0, 5) !== 'data-') {
+          continue;
+        }
+        var key = attribute.name.substring(5).replace(/\-([a-z])/g,
+          function(all, ch) {
+            return ch.toUpperCase();
+          });
+        dataset[key] = attribute.value;
+      }
+
+      Object.defineProperty(this, '_dataset', {
+        value: dataset,
+        writable: false,
+        enumerable: false
+      });
+      return dataset;
+    },
+    enumerable: true
+  });
+})();
+
+// HTMLElement classList property
+// Support: IE<10, Android<4.0, iOS<5.0
+(function checkClassListProperty() {
+  var div = document.createElement('div');
+  if ('classList' in div) {
+    return; // classList property exists
+  }
+
+  function changeList(element, itemName, add, remove) {
+    var s = element.className || '';
+    var list = s.split(/\s+/g);
+    if (list[0] === '') {
+      list.shift();
+    }
+    var index = list.indexOf(itemName);
+    if (index < 0 && add) {
+      list.push(itemName);
+    }
+    if (index >= 0 && remove) {
+      list.splice(index, 1);
+    }
+    element.className = list.join(' ');
+    return (index >= 0);
+  }
+
+  var classListPrototype = {
+    add: function(name) {
+      changeList(this.element, name, true, false);
+    },
+    contains: function(name) {
+      return changeList(this.element, name, false, false);
+    },
+    remove: function(name) {
+      changeList(this.element, name, false, true);
+    },
+    toggle: function(name) {
+      changeList(this.element, name, true, true);
+    }
+  };
+
+  Object.defineProperty(HTMLElement.prototype, 'classList', {
+    get: function() {
+      if (this._classList) {
+        return this._classList;
+      }
+
+      var classList = Object.create(classListPrototype, {
+        element: {
+          value: this,
+          writable: false,
+          enumerable: true
+        }
+      });
+      Object.defineProperty(this, '_classList', {
+        value: classList,
+        writable: false,
+        enumerable: false
+      });
+      return classList;
+    },
+    enumerable: true
+  });
+})();
+
+// Check console compatibility
+// In older IE versions the console object is not available
+// unless console is open.
+// Support: IE<10
+(function checkConsoleCompatibility() {
+  if (!('console' in window)) {
+    window.console = {
+      log: function() {},
+      error: function() {},
+      warn: function() {}
+    };
+  } else if (!('bind' in console.log)) {
+    // native functions in IE9 might not have bind
+    console.log = (function(fn) {
+      return function(msg) { return fn(msg); };
+    })(console.log);
+    console.error = (function(fn) {
+      return function(msg) { return fn(msg); };
+    })(console.error);
+    console.warn = (function(fn) {
+      return function(msg) { return fn(msg); };
+    })(console.warn);
+  }
+})();
+
+// Check onclick compatibility in Opera
+// Support: Opera<15
+(function checkOnClickCompatibility() {
+  // workaround for reported Opera bug DSK-354448:
+  // onclick fires on disabled buttons with opaque content
+  function ignoreIfTargetDisabled(event) {
+    if (isDisabled(event.target)) {
+      event.stopPropagation();
+    }
+  }
+  function isDisabled(node) {
+    return node.disabled || (node.parentNode && isDisabled(node.parentNode));
+  }
+  if (navigator.userAgent.indexOf('Opera') !== -1) {
+    // use browser detection since we cannot feature-check this bug
+    document.addEventListener('click', ignoreIfTargetDisabled, true);
+  }
+})();
+
+// Checks if possible to use URL.createObjectURL()
+// Support: IE
+(function checkOnBlobSupport() {
+  // sometimes IE loosing the data created with createObjectURL(), see #3977
+  if (navigator.userAgent.indexOf('Trident') >= 0) {
+    PDFJS.disableCreateObjectURL = true;
+  }
+})();
+
+// Checks if navigator.language is supported
+(function checkNavigatorLanguage() {
+  if ('language' in navigator) {
+    return;
+  }
+  PDFJS.locale = navigator.userLanguage || 'en-US';
+})();
+
+(function checkRangeRequests() {
+  // Safari has issues with cached range requests see:
+  // https://github.com/mozilla/pdf.js/issues/3260
+  // Last tested with version 6.0.4.
+  // Support: Safari 6.0+
+  var isSafari = Object.prototype.toString.call(
+                  window.HTMLElement).indexOf('Constructor') > 0;
+
+  // Older versions of Android (pre 3.0) has issues with range requests, see:
+  // https://github.com/mozilla/pdf.js/issues/3381.
+  // Make sure that we only match webkit-based Android browsers,
+  // since Firefox/Fennec works as expected.
+  // Support: Android<3.0
+  var regex = /Android\s[0-2][^\d]/;
+  var isOldAndroid = regex.test(navigator.userAgent);
+
+  // Range requests are broken in Chrome 39 and 40, https://crbug.com/442318
+  var isChromeWithRangeBug = /Chrome\/(39|40)\./.test(navigator.userAgent);
+
+  if (isSafari || isOldAndroid || isChromeWithRangeBug) {
+    PDFJS.disableRange = true;
+    PDFJS.disableStream = true;
+  }
+})();
+
+// Check if the browser supports manipulation of the history.
+// Support: IE<10, Android<4.2
+(function checkHistoryManipulation() {
+  // Android 2.x has so buggy pushState support that it was removed in
+  // Android 3.0 and restored as late as in Android 4.2.
+  // Support: Android 2.x
+  if (!history.pushState || navigator.userAgent.indexOf('Android 2.') >= 0) {
+    PDFJS.disableHistory = true;
+  }
+})();
+
+// Support: IE<11, Chrome<21, Android<4.4, Safari<6
+(function checkSetPresenceInImageData() {
+  // IE < 11 will use window.CanvasPixelArray which lacks set function.
+  if (window.CanvasPixelArray) {
+    if (typeof window.CanvasPixelArray.prototype.set !== 'function') {
+      window.CanvasPixelArray.prototype.set = function(arr) {
+        for (var i = 0, ii = this.length; i < ii; i++) {
+          this[i] = arr[i];
+        }
+      };
+    }
+  } else {
+    // Old Chrome and Android use an inaccessible CanvasPixelArray prototype.
+    // Because we cannot feature detect it, we rely on user agent parsing.
+    var polyfill = false, versionMatch;
+    if (navigator.userAgent.indexOf('Chrom') >= 0) {
+      versionMatch = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
+      // Chrome < 21 lacks the set function.
+      polyfill = versionMatch && parseInt(versionMatch[2]) < 21;
+    } else if (navigator.userAgent.indexOf('Android') >= 0) {
+      // Android < 4.4 lacks the set function.
+      // Android >= 4.4 will contain Chrome in the user agent,
+      // thus pass the Chrome check above and not reach this block.
+      polyfill = /Android\s[0-4][^\d]/g.test(navigator.userAgent);
+    } else if (navigator.userAgent.indexOf('Safari') >= 0) {
+      versionMatch = navigator.userAgent.
+        match(/Version\/([0-9]+)\.([0-9]+)\.([0-9]+) Safari\//);
+      // Safari < 6 lacks the set function.
+      polyfill = versionMatch && parseInt(versionMatch[1]) < 6;
+    }
+
+    if (polyfill) {
+      var contextPrototype = window.CanvasRenderingContext2D.prototype;
+      var createImageData = contextPrototype.createImageData;
+      contextPrototype.createImageData = function(w, h) {
+        var imageData = createImageData.call(this, w, h);
+        imageData.data.set = function(arr) {
+          for (var i = 0, ii = this.length; i < ii; i++) {
+            this[i] = arr[i];
+          }
+        };
+        return imageData;
+      };
+      // this closure will be kept referenced, so clear its vars
+      contextPrototype = null;
+    }
+  }
+})();
+
+// Support: IE<10, Android<4.0, iOS
+(function checkRequestAnimationFrame() {
+  function fakeRequestAnimationFrame(callback) {
+    window.setTimeout(callback, 20);
+  }
+
+  var isIOS = /(iPad|iPhone|iPod)/g.test(navigator.userAgent);
+  if (isIOS) {
+    // requestAnimationFrame on iOS is broken, replacing with fake one.
+    window.requestAnimationFrame = fakeRequestAnimationFrame;
+    return;
+  }
+  if ('requestAnimationFrame' in window) {
+    return;
+  }
+  window.requestAnimationFrame =
+    window.mozRequestAnimationFrame ||
+    window.webkitRequestAnimationFrame ||
+    fakeRequestAnimationFrame;
+})();
+
+(function checkCanvasSizeLimitation() {
+  var isIOS = /(iPad|iPhone|iPod)/g.test(navigator.userAgent);
+  var isAndroid = /Android/g.test(navigator.userAgent);
+  if (isIOS || isAndroid) {
+    // 5MP
+    PDFJS.maxCanvasPixels = 5242880;
+  }
+})();
+
+// Disable fullscreen support for certain problematic configurations.
+// Support: IE11+ (when embedded).
+(function checkFullscreenSupport() {
+  var isEmbeddedIE = (navigator.userAgent.indexOf('Trident') >= 0 &&
+                      window.parent !== window);
+  if (isEmbeddedIE) {
+    PDFJS.disableFullscreen = true;
+  }
+})();
+
+// Provides document.currentScript support
+// Support: IE, Chrome<29.
+(function checkCurrentScript() {
+  if ('currentScript' in document) {
+    return;
+  }
+  Object.defineProperty(document, 'currentScript', {
+    get: function () {
+      var scripts = document.getElementsByTagName('script');
+      return scripts[scripts.length - 1];
+    },
+    enumerable: true,
+    configurable: true
+  });
+})();
+
+}).call((typeof window === 'undefined') ? this : window);

wp/wp-content/plugins/wp-media-folder/assets/js/pdf-embed/debugger.js

@@ -0,0 +1,611 @@
+/* Copyright 2012 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.
+ */
+
+const { OPS } = globalThis.pdfjsLib || (await import("pdfjs-lib"));
+
+const opMap = Object.create(null);
+for (const key in OPS) {
+  opMap[OPS[key]] = key;
+}
+
+const FontInspector = (function FontInspectorClosure() {
+  let fonts;
+  let active = false;
+  const fontAttribute = "data-font-name";
+  function removeSelection() {
+    const divs = document.querySelectorAll(`span[${fontAttribute}]`);
+    for (const div of divs) {
+      div.className = "";
+    }
+  }
+  function resetSelection() {
+    const divs = document.querySelectorAll(`span[${fontAttribute}]`);
+    for (const div of divs) {
+      div.className = "debuggerHideText";
+    }
+  }
+  function selectFont(fontName, show) {
+    const divs = document.querySelectorAll(
+      `span[${fontAttribute}=${fontName}]`
+    );
+    for (const div of divs) {
+      div.className = show ? "debuggerShowText" : "debuggerHideText";
+    }
+  }
+  function textLayerClick(e) {
+    if (
+      !e.target.dataset.fontName ||
+      e.target.tagName.toUpperCase() !== "SPAN"
+    ) {
+      return;
+    }
+    const fontName = e.target.dataset.fontName;
+    const selects = document.getElementsByTagName("input");
+    for (const select of selects) {
+      if (select.dataset.fontName !== fontName) {
+        continue;
+      }
+      select.checked = !select.checked;
+      selectFont(fontName, select.checked);
+      select.scrollIntoView();
+    }
+  }
+  return {
+    // Properties/functions needed by PDFBug.
+    id: "FontInspector",
+    name: "Font Inspector",
+    panel: null,
+    manager: null,
+    init() {
+      const panel = this.panel;
+      const tmp = document.createElement("button");
+      tmp.addEventListener("click", resetSelection);
+      tmp.textContent = "Refresh";
+      panel.append(tmp);
+
+      fonts = document.createElement("div");
+      panel.append(fonts);
+    },
+    cleanup() {
+      fonts.textContent = "";
+    },
+    enabled: false,
+    get active() {
+      return active;
+    },
+    set active(value) {
+      active = value;
+      if (active) {
+        document.body.addEventListener("click", textLayerClick, true);
+        resetSelection();
+      } else {
+        document.body.removeEventListener("click", textLayerClick, true);
+        removeSelection();
+      }
+    },
+    // FontInspector specific functions.
+    fontAdded(fontObj, url) {
+      function properties(obj, list) {
+        const moreInfo = document.createElement("table");
+        for (const entry of list) {
+          const tr = document.createElement("tr");
+          const td1 = document.createElement("td");
+          td1.textContent = entry;
+          tr.append(td1);
+          const td2 = document.createElement("td");
+          td2.textContent = obj[entry].toString();
+          tr.append(td2);
+          moreInfo.append(tr);
+        }
+        return moreInfo;
+      }
+      const moreInfo = properties(fontObj, ["name", "type"]);
+      const fontName = fontObj.loadedName;
+      const font = document.createElement("div");
+      const name = document.createElement("span");
+      name.textContent = fontName;
+      const download = document.createElement("a");
+      if (url) {
+        url = /url\(['"]?([^)"']+)/.exec(url);
+        download.href = url[1];
+      } else if (fontObj.data) {
+        download.href = URL.createObjectURL(
+          new Blob([fontObj.data], { type: fontObj.mimetype })
+        );
+      }
+      download.textContent = "Download";
+      const logIt = document.createElement("a");
+      logIt.href = "";
+      logIt.textContent = "Log";
+      logIt.addEventListener("click", function (event) {
+        event.preventDefault();
+        console.log(fontObj);
+      });
+      const select = document.createElement("input");
+      select.setAttribute("type", "checkbox");
+      select.dataset.fontName = fontName;
+      select.addEventListener("click", function () {
+        selectFont(fontName, select.checked);
+      });
+      font.append(select, name, " ", download, " ", logIt, moreInfo);
+      fonts.append(font);
+      // Somewhat of a hack, should probably add a hook for when the text layer
+      // is done rendering.
+      setTimeout(() => {
+        if (this.active) {
+          resetSelection();
+        }
+      }, 2000);
+    },
+  };
+})();
+
+// Manages all the page steppers.
+const StepperManager = (function StepperManagerClosure() {
+  let steppers = [];
+  let stepperDiv = null;
+  let stepperControls = null;
+  let stepperChooser = null;
+  let breakPoints = Object.create(null);
+  return {
+    // Properties/functions needed by PDFBug.
+    id: "Stepper",
+    name: "Stepper",
+    panel: null,
+    manager: null,
+    init() {
+      const self = this;
+      stepperControls = document.createElement("div");
+      stepperChooser = document.createElement("select");
+      stepperChooser.addEventListener("change", function (event) {
+        self.selectStepper(this.value);
+      });
+      stepperControls.append(stepperChooser);
+      stepperDiv = document.createElement("div");
+      this.panel.append(stepperControls, stepperDiv);
+      if (sessionStorage.getItem("pdfjsBreakPoints")) {
+        breakPoints = JSON.parse(sessionStorage.getItem("pdfjsBreakPoints"));
+      }
+    },
+    cleanup() {
+      stepperChooser.textContent = "";
+      stepperDiv.textContent = "";
+      steppers = [];
+    },
+    enabled: false,
+    active: false,
+    // Stepper specific functions.
+    create(pageIndex) {
+      const debug = document.createElement("div");
+      debug.id = "stepper" + pageIndex;
+      debug.hidden = true;
+      debug.className = "stepper";
+      stepperDiv.append(debug);
+      const b = document.createElement("option");
+      b.textContent = "Page " + (pageIndex + 1);
+      b.value = pageIndex;
+      stepperChooser.append(b);
+      const initBreakPoints = breakPoints[pageIndex] || [];
+      const stepper = new Stepper(debug, pageIndex, initBreakPoints);
+      steppers.push(stepper);
+      if (steppers.length === 1) {
+        this.selectStepper(pageIndex, false);
+      }
+      return stepper;
+    },
+    selectStepper(pageIndex, selectPanel) {
+      pageIndex |= 0;
+      if (selectPanel) {
+        this.manager.selectPanel(this);
+      }
+      for (const stepper of steppers) {
+        stepper.panel.hidden = stepper.pageIndex !== pageIndex;
+      }
+      for (const option of stepperChooser.options) {
+        option.selected = (option.value | 0) === pageIndex;
+      }
+    },
+    saveBreakPoints(pageIndex, bps) {
+      breakPoints[pageIndex] = bps;
+      sessionStorage.setItem("pdfjsBreakPoints", JSON.stringify(breakPoints));
+    },
+  };
+})();
+
+// The stepper for each page's operatorList.
+class Stepper {
+  // Shorter way to create element and optionally set textContent.
+  #c(tag, textContent) {
+    const d = document.createElement(tag);
+    if (textContent) {
+      d.textContent = textContent;
+    }
+    return d;
+  }
+
+  #simplifyArgs(args) {
+    if (typeof args === "string") {
+      const MAX_STRING_LENGTH = 75;
+      return args.length <= MAX_STRING_LENGTH
+        ? args
+        : args.substring(0, MAX_STRING_LENGTH) + "...";
+    }
+    if (typeof args !== "object" || args === null) {
+      return args;
+    }
+    if ("length" in args) {
+      // array
+      const MAX_ITEMS = 10,
+        simpleArgs = [];
+      let i, ii;
+      for (i = 0, ii = Math.min(MAX_ITEMS, args.length); i < ii; i++) {
+        simpleArgs.push(this.#simplifyArgs(args[i]));
+      }
+      if (i < args.length) {
+        simpleArgs.push("...");
+      }
+      return simpleArgs;
+    }
+    const simpleObj = {};
+    for (const key in args) {
+      simpleObj[key] = this.#simplifyArgs(args[key]);
+    }
+    return simpleObj;
+  }
+
+  constructor(panel, pageIndex, initialBreakPoints) {
+    this.panel = panel;
+    this.breakPoint = 0;
+    this.nextBreakPoint = null;
+    this.pageIndex = pageIndex;
+    this.breakPoints = initialBreakPoints;
+    this.currentIdx = -1;
+    this.operatorListIdx = 0;
+    this.indentLevel = 0;
+  }
+
+  init(operatorList) {
+    const panel = this.panel;
+    const content = this.#c("div", "c=continue, s=step");
+    const table = this.#c("table");
+    content.append(table);
+    table.cellSpacing = 0;
+    const headerRow = this.#c("tr");
+    table.append(headerRow);
+    headerRow.append(
+      this.#c("th", "Break"),
+      this.#c("th", "Idx"),
+      this.#c("th", "fn"),
+      this.#c("th", "args")
+    );
+    panel.append(content);
+    this.table = table;
+    this.updateOperatorList(operatorList);
+  }
+
+  updateOperatorList(operatorList) {
+    const self = this;
+
+    function cboxOnClick() {
+      const x = +this.dataset.idx;
+      if (this.checked) {
+        self.breakPoints.push(x);
+      } else {
+        self.breakPoints.splice(self.breakPoints.indexOf(x), 1);
+      }
+      StepperManager.saveBreakPoints(self.pageIndex, self.breakPoints);
+    }
+
+    const MAX_OPERATORS_COUNT = 15000;
+    if (this.operatorListIdx > MAX_OPERATORS_COUNT) {
+      return;
+    }
+
+    const chunk = document.createDocumentFragment();
+    const operatorsToDisplay = Math.min(
+      MAX_OPERATORS_COUNT,
+      operatorList.fnArray.length
+    );
+    for (let i = this.operatorListIdx; i < operatorsToDisplay; i++) {
+      const line = this.#c("tr");
+      line.className = "line";
+      line.dataset.idx = i;
+      chunk.append(line);
+      const checked = this.breakPoints.includes(i);
+      const args = operatorList.argsArray[i] || [];
+
+      const breakCell = this.#c("td");
+      const cbox = this.#c("input");
+      cbox.type = "checkbox";
+      cbox.className = "points";
+      cbox.checked = checked;
+      cbox.dataset.idx = i;
+      cbox.onclick = cboxOnClick;
+
+      breakCell.append(cbox);
+      line.append(breakCell, this.#c("td", i.toString()));
+      const fn = opMap[operatorList.fnArray[i]];
+      let decArgs = args;
+      if (fn === "showText") {
+        const glyphs = args[0];
+        const charCodeRow = this.#c("tr");
+        const fontCharRow = this.#c("tr");
+        const unicodeRow = this.#c("tr");
+        for (const glyph of glyphs) {
+          if (typeof glyph === "object" && glyph !== null) {
+            charCodeRow.append(this.#c("td", glyph.originalCharCode));
+            fontCharRow.append(this.#c("td", glyph.fontChar));
+            unicodeRow.append(this.#c("td", glyph.unicode));
+          } else {
+            // null or number
+            const advanceEl = this.#c("td", glyph);
+            advanceEl.classList.add("advance");
+            charCodeRow.append(advanceEl);
+            fontCharRow.append(this.#c("td"));
+            unicodeRow.append(this.#c("td"));
+          }
+        }
+        decArgs = this.#c("td");
+        const table = this.#c("table");
+        table.classList.add("showText");
+        decArgs.append(table);
+        table.append(charCodeRow, fontCharRow, unicodeRow);
+      } else if (fn === "restore" && this.indentLevel > 0) {
+        this.indentLevel--;
+      }
+      line.append(this.#c("td", " ".repeat(this.indentLevel * 2) + fn));
+      if (fn === "save") {
+        this.indentLevel++;
+      }
+
+      if (decArgs instanceof HTMLElement) {
+        line.append(decArgs);
+      } else {
+        line.append(this.#c("td", JSON.stringify(this.#simplifyArgs(decArgs))));
+      }
+    }
+    if (operatorsToDisplay < operatorList.fnArray.length) {
+      const lastCell = this.#c("td", "...");
+      lastCell.colspan = 4;
+      chunk.append(lastCell);
+    }
+    this.operatorListIdx = operatorList.fnArray.length;
+    this.table.append(chunk);
+  }
+
+  getNextBreakPoint() {
+    this.breakPoints.sort(function (a, b) {
+      return a - b;
+    });
+    for (const breakPoint of this.breakPoints) {
+      if (breakPoint > this.currentIdx) {
+        return breakPoint;
+      }
+    }
+    return null;
+  }
+
+  breakIt(idx, callback) {
+    StepperManager.selectStepper(this.pageIndex, true);
+    this.currentIdx = idx;
+
+    const listener = evt => {
+      switch (evt.keyCode) {
+        case 83: // step
+          document.removeEventListener("keydown", listener);
+          this.nextBreakPoint = this.currentIdx + 1;
+          this.goTo(-1);
+          callback();
+          break;
+        case 67: // continue
+          document.removeEventListener("keydown", listener);
+          this.nextBreakPoint = this.getNextBreakPoint();
+          this.goTo(-1);
+          callback();
+          break;
+      }
+    };
+    document.addEventListener("keydown", listener);
+    this.goTo(idx);
+  }
+
+  goTo(idx) {
+    const allRows = this.panel.getElementsByClassName("line");
+    for (const row of allRows) {
+      if ((row.dataset.idx | 0) === idx) {
+        row.style.backgroundColor = "rgb(251,250,207)";
+        row.scrollIntoView();
+      } else {
+        row.style.backgroundColor = null;
+      }
+    }
+  }
+}
+
+const Stats = (function Stats() {
+  let stats = [];
+  function clear(node) {
+    node.textContent = ""; // Remove any `node` contents from the DOM.
+  }
+  function getStatIndex(pageNumber) {
+    for (const [i, stat] of stats.entries()) {
+      if (stat.pageNumber === pageNumber) {
+        return i;
+      }
+    }
+    return false;
+  }
+  return {
+    // Properties/functions needed by PDFBug.
+    id: "Stats",
+    name: "Stats",
+    panel: null,
+    manager: null,
+    init() {},
+    enabled: false,
+    active: false,
+    // Stats specific functions.
+    add(pageNumber, stat) {
+      if (!stat) {
+        return;
+      }
+      const statsIndex = getStatIndex(pageNumber);
+      if (statsIndex !== false) {
+        stats[statsIndex].div.remove();
+        stats.splice(statsIndex, 1);
+      }
+      const wrapper = document.createElement("div");
+      wrapper.className = "stats";
+      const title = document.createElement("div");
+      title.className = "title";
+      title.textContent = "Page: " + pageNumber;
+      const statsDiv = document.createElement("div");
+      statsDiv.textContent = stat.toString();
+      wrapper.append(title, statsDiv);
+      stats.push({ pageNumber, div: wrapper });
+      stats.sort(function (a, b) {
+        return a.pageNumber - b.pageNumber;
+      });
+      clear(this.panel);
+      for (const entry of stats) {
+        this.panel.append(entry.div);
+      }
+    },
+    cleanup() {
+      stats = [];
+      clear(this.panel);
+    },
+  };
+})();
+
+// Manages all the debugging tools.
+class PDFBug {
+  static #buttons = [];
+
+  static #activePanel = null;
+
+  static tools = [FontInspector, StepperManager, Stats];
+
+  static enable(ids) {
+    const all = ids.length === 1 && ids[0] === "all";
+    const tools = this.tools;
+    for (const tool of tools) {
+      if (all || ids.includes(tool.id)) {
+        tool.enabled = true;
+      }
+    }
+    if (!all) {
+      // Sort the tools by the order they are enabled.
+      tools.sort(function (a, b) {
+        let indexA = ids.indexOf(a.id);
+        indexA = indexA < 0 ? tools.length : indexA;
+        let indexB = ids.indexOf(b.id);
+        indexB = indexB < 0 ? tools.length : indexB;
+        return indexA - indexB;
+      });
+    }
+  }
+
+  static init(container, ids) {
+    this.loadCSS();
+    this.enable(ids);
+    /*
+     * Basic Layout:
+     * PDFBug
+     *  Controls
+     *  Panels
+     *    Panel
+     *    Panel
+     *    ...
+     */
+    const ui = document.createElement("div");
+    ui.id = "PDFBug";
+
+    const controls = document.createElement("div");
+    controls.setAttribute("class", "controls");
+    ui.append(controls);
+
+    const panels = document.createElement("div");
+    panels.setAttribute("class", "panels");
+    ui.append(panels);
+
+    container.append(ui);
+    container.style.right = "var(--panel-width)";
+
+    // Initialize all the debugging tools.
+    for (const tool of this.tools) {
+      const panel = document.createElement("div");
+      const panelButton = document.createElement("button");
+      panelButton.textContent = tool.name;
+      panelButton.addEventListener("click", event => {
+        event.preventDefault();
+        this.selectPanel(tool);
+      });
+      controls.append(panelButton);
+      panels.append(panel);
+      tool.panel = panel;
+      tool.manager = this;
+      if (tool.enabled) {
+        tool.init();
+      } else {
+        panel.textContent =
+          `${tool.name} is disabled. To enable add "${tool.id}" to ` +
+          "the pdfBug parameter and refresh (separate multiple by commas).";
+      }
+      this.#buttons.push(panelButton);
+    }
+    this.selectPanel(0);
+  }
+
+  static loadCSS() {
+    const { url } = import.meta;
+
+    const link = document.createElement("link");
+    link.rel = "stylesheet";
+    link.href = url.replace(/.js$/, ".css");
+
+    document.head.append(link);
+  }
+
+  static cleanup() {
+    for (const tool of this.tools) {
+      if (tool.enabled) {
+        tool.cleanup();
+      }
+    }
+  }
+
+  static selectPanel(index) {
+    if (typeof index !== "number") {
+      index = this.tools.indexOf(index);
+    }
+    if (index === this.#activePanel) {
+      return;
+    }
+    this.#activePanel = index;
+    for (const [j, tool] of this.tools.entries()) {
+      const isActive = j === index;
+      this.#buttons[j].classList.toggle("active", isActive);
+      tool.active = isActive;
+      tool.panel.hidden = !isActive;
+    }
+  }
+}
+
+globalThis.FontInspector = FontInspector;
+globalThis.StepperManager = StepperManager;
+globalThis.Stats = Stats;
+
+export { PDFBug };