Issue 2120 - Add support for animations.

static/js/animation.js

Index: static/js/animation.js
diff --git a/static/js/animation.js b/static/js/animation.js
new file mode 100644
index 0000000000000000000000000000000000000000..79b4f22c8b18fdd4499f035d9769be8b6d3c552a
--- /dev/null
+++ b/static/js/animation.js
@@ -0,0 +1,349 @@
+/*
+ * This file is part of the Adblock Plus website,
+ * Copyright (C) 2006-2015 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+if (typeof window.addEventListener != "undefined") {
+  window.addEventListener("load", initAnimations, false);
+  document.addEventListener("click", loadAnimation, false);
+}
+
+var ns = "https://adblockplus.org/animation";
+var loadPrefix = "animations/";
+var loadSuffix = ".xml";
+
+function initAnimations() {
+  var list = document.getElementsByTagNameNS(ns, "animation");
+  if (list.length == 0)
+    list = document.getElementsByTagName("animation");  // HTML mode, Anwiki
+  for (var i = 0; i < list.length; i++) {
+    var node = list[i];
+    if (!node.hasAttribute("name") || !node.hasAttribute("label"))
+      continue;
+
+    var animation = document.createElement("div");
+    animation.setAttribute("class", "animation");
+    animation.setAttribute("name", node.getAttribute("name"));
+    animation.setAttribute("started", false);
+    animation.style.margin = "5px";
+
+    var link = document.createElement("a");
+    link.appendChild(document.createTextNode(node.getAttribute("label")));
+    animation.appendChild(link);
+
+    node.parentNode.insertBefore(animation, node);
+  }
+}
+
+function loadAnimation(event) {
+  var animation = event.target;
+  while (animation && animation.nodeType == 1 && animation.className != "animation")
+    animation = animation.parentNode;
+
+  if (!animation || animation.nodeType != 1 || animation.getAttribute("started") == "true")
+    return;
+
+  animation.setAttribute("started", "true");
+
+  while (animation.firstChild)
+    animation.removeChild(animation.firstChild);
+
+  animation.style.border = "1px dashed black";
+  animation.style.padding = "10px";
+  animation.style.width = "50px";
+  animation.style.height = "50px";
+
+  var container = document.createElement("div");
+  container.style.width = "0px";
+  container.style.height = "0px";
+  container.style.overflow = "visible";
+  container.style.position = "relative";
+  container.style.visibility = "hidden";
+
+  var image = document.createElement("img");
+  container.appendChild(image);
+  animation.appendChild(container);
+
+  image.onload = function() {
+    container.style.left = Math.round((50 - image.width) / 2) + "px";
+    container.style.top = Math.round((50 - image.height) / 2) + "px";
+    container.style.visibility  = "";
+  }
+  image.src = "data:image/gif;base64,R0lGODlhGAAYAPQAAP%2F%2F%2FwCA%2F87m%2Fvr8%2FuDv%2FrDX%2Fujz%2Fo7G%2Fsjj%2FpzN%2Ftjr%2FqjT%2FsDf%2FvL4%2Fna6%2FobC%2Frjb%2Fmiz%2FgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH%2BGkNyZWF0ZWQgd2l0aCBhamF4bG9hZC5pbmZvACH5BAAHAAAAIf8LTkVUU0NBUEUyLjADAQAAACwAAAAAGAAYAAAFriAgjiQAQWVaDgr5POSgkoTDjFE0NoQ8iw8HQZQTDQjDn4jhSABhAAOhoTqSDg7qSUQwxEaEwwFhXHhHgzOA1xshxAnfTzotGRaHglJqkJcaVEqCgyoCBQkJBQKDDXQGDYaIioyOgYSXA36XIgYMBWRzXZoKBQUMmil0lgalLSIClgBpO0g%2Bs26nUWddXyoEDIsACq5SsTMMDIECwUdJPw0Mzsu0qHYkw72bBmozIQAh%2BQQABwABACwAAAAAGAAYAAAFsCAgjiTAMGVaDgR5HKQwqKNxIKPjjFCk0KNXC6ATKSI7oAhxWIhezwhENTCQEoeGCdWIPEgzESGxEIgGBWstEW4QCGGAIJEoxGmGt5ZkgCRQQHkGd2CESoeIIwoMBQUMP4cNeQQGDYuNj4iSb5WJnmeGng0CDGaBlIQEJziHk3sABidDAHBgagButSKvAAoyuHuUYHgCkAZqebw0AgLBQyyzNKO3byNuoSS8x8OfwIchACH5BAAHAAIALAAAAAAYABgAAAW4ICCOJIAgZVoOBJkkpDKoo5EI43GMjNPSokXCINKJCI4HcCRIQEQvqIOhGhBHhUTDhGo4diOZyFAoKEQDxra2mAEgjghOpCgz3LTBIxJ5kgwMBShACREHZ1V4Kg1rS44pBAgMDAg%2FSw0GBAQGDZGTlY%2BYmpyPpSQDiqYiDQoCliqZBqkGAgKIS5kEjQ21VwCyp76dBHiNvz%2BMR74AqSOdVwbQuo%2Babppo10ssjdkAnc0rf8vgl8YqIQAh%2BQQABwADACwAAAAAGAAYAAAFrCAgjiQgCGVaDgZZFCQxqKNRKGOSjMjR0qLXTyciHA7AkaLACMIAiwOC1iAxCrMToHHYjWQiA4NBEA0Q1RpWxHg4cMXxNDk4OBxNUkPAQAEXDgllKgMzQA1pSYopBgonCj9JEA8REQ8QjY%2BRQJOVl4ugoYssBJuMpYYjDQSliwasiQOwNakALKqsqbWvIohFm7V6rQAGP6%2BJQLlFg7KDQLKJrLjBKbvAor3IKiEAIfkEAAcABAAsAAAAABgAGAAABbUgII4koChlmhokw5DEoI4NQ4xFMQoJO4uuhignMiQWvxGBIQC%2BAJBEUyUcIRiyE6CR0CllW4HABxBURTUw4nC4FcWo5CDBRpQaCoF7VjgsyCUDYDMNZ0mHdwYEBAaGMwwHDg4HDA2KjI4qkJKUiJ6faJkiA4qAKQkRB3E0i6YpAw8RERAjA4tnBoMApCMQDhFTuySKoSKMJAq6rD4GzASiJYtgi6PUcs9Kew0xh7rNJMqIhYchACH5BAAHAAUALAAAAAAYABgAAAW0ICCOJEAQZZo2JIKQxqCOjWCMDDMqxT2LAgELkBMZCoXfyCBQiFwiRsGpku0EshNgUNAtrYPT0GQVNRBWwSKBMp98P24iISgNDAS4ipGA6JUpA2WAhDR4eWM%2FCAkHBwkIDYcGiTOLjY%2BFmZkNlCN3eUoLDmwlDW%2BAAwcODl5bYl8wCVYMDw5UWzBtnAANEQ8kBIM0oAAGPgcREIQnVloAChEOqARjzgAQEbczg8YkWJq8nSUhACH5BAAHAAYALAAAAAAYABgAAAWtICCOJGAYZZoOpKKQqDoORDMKwkgwtiwSBBYAJ2owGL5RgxBziQQMgkwoMkhNqAEDARPSaiMDFdDIiRSFQowMXE8Z6RdpYHWnEAWGPVkajPmARVZMPUkCBQkJBQINgwaFPoeJi4GVlQ2Qc3VJBQcLV0ptfAMJBwdcIl%2BFYjALQgimoGNWIhAQZA4HXSpLMQ8PIgkOSHxAQhERPw7ASTSFyCMMDqBTJL8tf3y2fCEAIfkEAAcABwAsAAAAABgAGAAABa8gII4k0DRlmg6kYZCoOg5EDBDEaAi2jLO3nEkgkMEIL4BLpBAkVy3hCTAQKGAznM0AFNFGBAbj2cA9jQixcGZAGgECBu%2F9HnTp%2BFGjjezJFAwFBQwKe2Z%2BKoCChHmNjVMqA21nKQwJEJRlbnUFCQlFXlpeCWcGBUACCwlrdw8RKGImBwktdyMQEQciB7oACwcIeA4RVwAODiIGvHQKERAjxyMIB5QlVSTLYLZ0sW8hACH5BAAHAAgALAAAAAAYABgAAAW0ICCOJNA0ZZoOpGGQrDoOBCoSxNgQsQzgMZyIlvOJdi%2BAS2SoyXrK4umWPM5wNiV0UDUIBNkdoepTfMkA7thIECiyRtUAGq8fm2O4jIBgMBA1eAZ6Knx%2BgHaJR4QwdCMKBxEJRggFDGgQEREPjjAMBQUKIwIRDhBDC2QNDDEKoEkDoiMHDigICGkJBS2dDA6TAAnAEAkCdQ8ORQcHTAkLcQQODLPMIgIJaCWxJMIkPIoAt3EhACH5BAAHAAkALAAAAAAYABgAAAWtICCOJNA0ZZoOpGGQrDoOBCoSxNgQsQzgMZyIlvOJdi%2BAS2SoyXrK4umWHM5wNiV0UN3xdLiqr%2BmENcWpM9TIbrsBkEck8oC0DQqBQGGIz%2Bt3eXtob0ZTPgNrIwQJDgtGAgwCWSIMDg4HiiUIDAxFAAoODwxDBWINCEGdSTQkCQcoegADBaQ6MggHjwAFBZUFCm0HB0kJCUy9bAYHCCPGIwqmRq0jySMGmj6yRiEAIfkEAAcACgAsAAAAABgAGAAABbIgII4k0DRlmg6kYZCsOg4EKhLE2BCxDOAxnIiW84l2L4BLZKipBopW8XRLDkeCiAMyMvQAA%2BuON4JEIo%2BvqukkKQ6RhLHplVGN%2BLyKcXA4Dgx5DWwGDXx%2BgIKENnqNdzIDaiMECwcFRgQCCowiCAcHCZIlCgICVgSfCEMMnA0CXaU2YSQFoQAKUQMMqjoyAglcAAyBAAIMRUYLCUkFlybDeAYJryLNk6xGNCTQXY0juHghACH5BAAHAAsALAAAAAAYABgAAAWzICCOJNA0ZVoOAmkY5KCSSgSNBDE2hDyLjohClBMNij8RJHIQvZwEVOpIekRQJyJs5AMoHA%2BGMbE1lnm9EcPhOHRnhpwUl3AsknHDm5RN%2Bv8qCAkHBwkIfw1xBAYNgoSGiIqMgJQifZUjBhAJYj95ewIJCQV7KYpzBAkLLQADCHOtOpY5PgNlAAykAEUsQ1wzCgWdCIdeArczBQVbDJ0NAqyeBb64nQAGArBTt8R8mLuyPyEAOwAAAAAAAAAAAA%3D%3D";
+
+  var request = new XMLHttpRequest();
+  request.open("GET", loadPrefix + encodeURIComponent(animation.getAttribute("name")) + loadSuffix);
+  request.onload = function() {
+    if (!request.responseXML || !request.responseXML.documentElement)
+      return;
+
+    animation._data = request.responseXML.documentElement;
+    initAnimation(animation);
+  }
+  request.send(null);
+}
+
+function initAnimation(animation) {
+  while (animation.firstChild)
+    animation.removeChild(animation.firstChild);
+
+  var data = animation._data;
+  animation._width = (parseInt(data.getAttribute("width")) || 150);
+  animation._height = (parseInt(data.getAttribute("height")) || 150);
+  animation._stepSize = parseInt(data.getAttribute("step")) || 20;
+
+  animation.style.width = animation._width + "px";
+  animation.style.height = animation._height + "px";
+
+  var count = 0;
+  var initializer = function(event) {
+    count--;
+    if (count <= 0)
+      postInitAnimation(animation);
+  }
+
+  animation._objects = {};
+  var list = data.getElementsByTagNameNS(ns, "object");
+  for (var i = 0; i < list.length; i++) {
+    var node = list[i];
+    if (!node.hasAttribute("id") || !node.hasAttribute("src"))
+      continue;
+
+    count++;
+
+    var image = document.createElement("img");
+    image.addEventListener("load", initializer, false);
+    image.src = node.getAttribute("src");
+
+    var object = document.createElement("div");
+    object.style.width = "0px";
+    object.style.height = "0px";
+    object.style.overflow = "visible";
+    object.style.position = "relative";
+    object.style.visibility = "hidden";
+    object._anchor = node.getAttribute("anchor");
+    object._coords = [0,0];
+
+    object.appendChild(image);
+    animation.insertBefore(object, animation.firstChild);
+    animation._objects[node.getAttribute("id")] = object;
+  }
+}
+
+function postInitAnimation(animation) {
+  for (var key in animation._objects) {
+    var object = animation._objects[key];
+    var image = object.firstChild;
+
+    object._size = [image.width, image.height];
+    var offset = parseCoords(object._anchor);
+    if (offset) {
+      offset[0] = -offset[0];
+      offset[1] = -offset[1];
+    }
+    else {
+      offset = [0, 0];
+      if (object._anchor)
+        processAnchor(offset, object._anchor, [-image.width, -image.height]);
+    }
+    object._offset = offset;
+  }
+
+  animation._actions = [];
+
+  var getStepData = function(step) {
+    if (typeof animation._actions[step] == "undefined")
+      animation._actions[step] = [];
+
+    return animation._actions[step];
+  }
+
+  var list = animation._data.getElementsByTagNameNS(ns, "action");
+  var timestamp = 0;
+  for (var i = 0; i < list.length; i++) {
+    var node = list[i];
+    var prevTimestamp = timestamp;
+    timestamp += (parseInt(node.getAttribute("delay")) || 0);
+
+    // Update position for moving objects
+    for (var t = prevTimestamp + 1; t < timestamp; t++) {
+      if (typeof animation._actions[t] != "undefined") {
+        var curActions = animation._actions[t];
+        for (var j = 0; j < curActions.length; j++)
+          if (typeof curActions[j].obj != "undefined")
+            curActions[j].obj._coords = curActions[j].coords;
+      }
+    }
+
+    for (var child = node.firstChild; child; child = child.nextSibling) {
+      if (child.nodeType != 1)
+        continue;
+
+      var objects = child.getAttribute("object");
+      if (objects) {
+        objects = objects.split(/\s*,\s*/);
+        for (var j = 0; j < objects.length; j++) {
+          if (typeof animation._objects[objects[j]] == "undefined")
+            objects.splice(j--, 1);
+          else
+            objects[j] = animation._objects[objects[j]];
+        }
+      }
+      if (objects.length == 0)
+        continue;
+
+      if (child.localName == "show") {
+        var coords = parseRelativeCoords(animation._objects, child, "coords", "coordsOf", "anchor", "offset");
+        if (coords) {
+          var data = getStepData(timestamp);
+          for (var j = 0; j < objects.length; j++) {
+            objects[j]._coords = coords;
+            data.push({obj: objects[j], coords: coords});
+          }
+        }
+      }
+      else if (child.localName == "hide" || child.localName == "replace") {
+        var data = getStepData(timestamp);
+        data.push.apply(getStepData(timestamp), objects);
+        if (child.localName == "replace" && typeof animation._objects[child.getAttribute("with")] != "undefined") {
+          var object = animation._objects[child.getAttribute("with")];
+          object._coords = objects[0]._coords;
+          data.push({obj: object, coords: object._coords});
+        }
+      }
+      else if (child.localName == "move") {
+        var from = parseRelativeCoords(animation._objects, child, "fromCoords", "fromCoordsOf", "fromAnchor", "fromOffset");
+        var to = parseRelativeCoords(animation._objects, child, "toCoords", "toCoordsOf", "toAnchor", "toOffset");
+        var duration = parseInt(child.getAttribute("duration")) || 0;
+        if (to) {
+          if (!from)
+            from = objects[0]._coords;
+
+          for (var j = 0; j < objects.length; j++)
+            objects[j]._coords = from;
+
+          for (var t = timestamp; t <= timestamp + duration; t++) {
+            var curCoords = [
+                              (timestamp + duration - t) / duration * from[0] + (t - timestamp) / duration * to[0],
+                              (timestamp + duration - t) / duration * from[1] + (t - timestamp) / duration * to[1]
+                            ];
+            var data = getStepData(t);
+            for (var j = 0; j < objects.length; j++)
+              data.push({obj: objects[j], coords: curCoords});
+          }
+        }
+      }
+    }
+  }
+
+  runAnimation(animation);
+}
+
+function executeAnimationStep(animation, timestamp) {
+  if (typeof animation._actions[timestamp] == "undefined")
+    return;
+
+  var action = animation._actions[timestamp];
+  for (var i = 0; i < action.length; i++) {
+    if (action[i] instanceof HTMLElement)
+      action[i].style.visibility = "hidden";
+    else {
+      action[i].obj.style.left = (action[i].coords[0] + action[i].obj._offset[0]) + "px";
+      action[i].obj.style.top = (action[i].coords[1] + action[i].obj._offset[1]) + "px";
+      action[i].obj.style.visibility = "";
+    }
+  }
+}
+
+function runAnimation(animation) {
+  if (typeof animation.scrollIntoView == "function")
+    animation.scrollIntoView(true)
+
+  executeAnimationStep(animation, 0);
+
+  var curStep = 0;
+  var interval = setInterval(function() {
+    executeAnimationStep(animation, ++curStep);
+    if (curStep >= animation._actions.length) {
+      clearInterval(interval);
+      animation.style.cursor = "pointer";
+      animation.addEventListener("click", restartAnimation, false);
+    }
+  }, animation._stepSize);
+}
+
+function restartAnimation(event) {
+  var animation = event.target;
+  while (animation && animation.nodeType == 1 && animation.className != "animation")
+    animation = animation.parentNode;
+
+  if (!animation || animation.nodeType != 1)
+    return;
+
+  animation.removeEventListener("click", restartAnimation, false);
+  animation.style.cursor = "";
+
+  for (var key in animation._objects)
+    animation._objects[key].style.visibility = "hidden";
+
+  runAnimation(animation);
+}
+
+function parseCoords(coords) {
+  if (!/^\s*([\-+]?\d+)\s*,\s*([\-+]?\d+)\s*$/.test(coords))
+    return null;
+
+  return [parseInt(RegExp.$1) || 0, parseInt(RegExp.$2) || 0];
+}
+
+function parseRelativeCoords(objects, node, coordsAttr, objectAttr, anchorAttr, offsetAttr) {
+  var coords = parseCoords(node.getAttribute(coordsAttr));
+  if (!coords) {
+    var object = node.getAttribute(objectAttr);
+    if (object && typeof objects[object] != "undefined") {
+      object = objects[object];
+      coords = object._coords.slice(0);
+
+      var anchor = node.getAttribute(anchorAttr);
+      if (anchor) {
+        coords[0] += object._offset[0];
+        coords[1] += object._offset[1];
+        processAnchor(coords, anchor, object._size);
+      }
+    }
+  }
+
+  if (coords) {
+    var offset = parseCoords(node.getAttribute(offsetAttr));
+    if (offset) {
+      coords[0] += offset[0];
+      coords[1] += offset[1];
+    }
+  }
+
+  return coords;
+}
+
+function processAnchor(coords, anchor, size) {
+  if (/right/i.test(anchor))
+    coords[0] += size[0];
+  else if (!/left/i.test(anchor))
+    coords[0] += Math.round(size[0]/2);
+
+  if (/bottom/i.test(anchor))
+    coords[1] += size[1];
+  else if (!/top/i.test(anchor))
+    coords[1] += Math.round(size[1]/2);
+}