v13.0.0-65 -- distribution files

(DOCS) Remove y-array duplicates

README.md

@@ -70,7 +70,6 @@ missing modules.
 <script src="https://cdn.jsdelivr.net/npm/y-array@10/dist/y-array.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/y-websockets-client@8/dist/y-websockets-client.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/y-memory@8/dist/y-memory.js"></script>
-<script src="https://cdn.jsdelivr.net/npm/y-array@10/dist/y-array.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/y-map@10/dist/y-map.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/y-text@9/dist/y-text.js"></script>
 // ..
@@ -89,7 +88,6 @@ var Y = require('yjs')
 require('y-array')(Y) // add the y-array type to Yjs
 require('y-websockets-client')(Y)
 require('y-memory')(Y)
-require('y-array')(Y)
 require('y-map')(Y)
 require('y-text')(Y)
 // ..
@@ -102,7 +100,6 @@ import Y from 'yjs'
 import yArray from 'y-array'
 import yWebsocketsClient from 'y-webrtc'
 import yMemory from 'y-memory'
-import yArray from 'y-array'
 import yMap from 'y-map'
 import yText from 'y-text'
 // ..

examples/html-editor/index.js

@@ -1,7 +1,7 @@
 /* global Y */
 
 window.onload = function () {
-  window.domBinding = new Y.DomBinding(window.yXmlType, document.body)
+  window.domBinding = new Y.DomBinding(window.yXmlType, document.body, { scrollingElement: document.scrollingElement })
 }
 
 let y = new Y('htmleditor', {

examples/quill-cursors/index.js

@@ -20,7 +20,7 @@ let quill = new Quill('#quill-container', {
       [{ header: [1, 2, false] }],
       ['bold', 'italic', 'underline'],
       ['image', 'code-block'],
-      [{ color: [] }, { background: [] }],    // Snow theme fills in values
+      [{ color: [] }, { background: [] }], // Snow theme fills in values
       [{ script: 'sub' }, { script: 'super' }],
       ['link', 'image'],
       ['link', 'code-block'],
@@ -31,7 +31,7 @@ let quill = new Quill('#quill-container', {
     }
   },
   placeholder: 'Compose an epic...',
-  theme: 'snow'  // or 'bubble'
+  theme: 'snow' // or 'bubble'
 })
 
 let cursors = quill.getModule('cursors')

examples/quill/index.js

@@ -13,7 +13,7 @@ let quill = new Quill('#quill-container', {
       [{ header: [1, 2, false] }],
       ['bold', 'italic', 'underline'],
       ['image', 'code-block'],
-      [{ color: [] }, { background: [] }],    // Snow theme fills in values
+      [{ color: [] }, { background: [] }], // Snow theme fills in values
       [{ script: 'sub' }, { script: 'super' }],
       ['link', 'image'],
       ['link', 'code-block'],
@@ -21,7 +21,7 @@ let quill = new Quill('#quill-container', {
     ]
   },
   placeholder: 'Compose an epic...',
-  theme: 'snow'  // or 'bubble'
+  theme: 'snow' // or 'bubble'
 })
 
 let yText = y.define('quill', Y.Text)

examples/serviceworker/index.js

@@ -35,7 +35,7 @@ Y({
       toolbar: [
         [{ size: ['small', false, 'large', 'huge'] }],
         ['bold', 'italic', 'underline'],
-        [{ color: [] }, { background: [] }],    // Snow theme fills in values
+        [{ color: [] }, { background: [] }], // Snow theme fills in values
         [{ script: 'sub' }, { script: 'super' }],
         ['link', 'image'],
         ['link', 'code-block'],

package-lock.json

@@ -1,9 +1,21 @@
 {
   "name": "yjs",
-  "version": "13.0.0-54",
+  "version": "13.0.0-65",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@types/estree": {
+      "version": "0.0.38",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.38.tgz",
+      "integrity": "sha512-F/v7t1LwS4vnXuPooJQGBRKRGIoxWUTmA4VHfqjOccFsNDThD5bfUNpITive6s352O7o384wcpEaDV8rHCehDA==",
+      "dev": true
+    },
+    "@types/node": {
+      "version": "6.0.110",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-6.0.110.tgz",
+      "integrity": "sha512-LiaH3mF+OAqR+9Wo1OTJDbZDtCewAVjTbMhF1ZgUJ3fc8xqOJq6VqbpBh9dJVCVzByGmYIg2fREbuXNX0TKiJA==",
+      "dev": true
+    },
     "abab": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/abab/-/abab-1.0.4.tgz",
@@ -1498,6 +1510,7 @@
       "version": "2.6.8",
       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.8.tgz",
       "integrity": "sha1-5zFTHKLt4n0YgiJCfaF4IdaP9Pw=",
+      "dev": true,
       "requires": {
         "ms": "2.0.0"
       }
@@ -4806,7 +4819,8 @@
     "ms": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+      "dev": true
     },
     "mute-stream": {
       "version": "0.0.5",
@@ -5629,6 +5643,16 @@
         "glob": "7.1.2"
       }
     },
+    "rollup": {
+      "version": "0.58.2",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-0.58.2.tgz",
+      "integrity": "sha512-RZVvCWm9BHOYloaE6LLiE/ibpjv1CmI8F8k0B0Cp+q1eezo3cswszJH1DN0djgzSlo0hjuuCmyeI+1XOYLl4wg==",
+      "dev": true,
+      "requires": {
+        "@types/estree": "0.0.38",
+        "@types/node": "6.0.110"
+      }
+    },
     "rollup-plugin-babel": {
       "version": "2.7.1",
       "resolved": "https://registry.npmjs.org/rollup-plugin-babel/-/rollup-plugin-babel-2.7.1.tgz",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "yjs",
-  "version": "13.0.0-54",
+  "version": "13.0.0-65",
   "description": "A framework for real-time p2p shared editing on any data",
   "main": "./y.node.js",
   "browser": "./y.js",
@@ -61,6 +61,7 @@
     "esdoc-standard-plugin": "^1.0.0",
     "quill": "^1.3.5",
     "quill-cursors": "^1.0.2",
+    "rollup": "^0.58.2",
     "rollup-plugin-babel": "^2.7.1",
     "rollup-plugin-commonjs": "^8.0.2",
     "rollup-plugin-inject": "^2.0.0",
@@ -71,8 +72,5 @@
     "rollup-watch": "^3.2.2",
     "standard": "^10.0.2",
     "tag-dist-files": "^0.1.6"
-  },
-  "dependencies": {
-    "debug": "^2.6.8"
   }
 }

src/Bindings/DomBinding/DomBinding.js

@@ -1,8 +1,9 @@
-/* global MutationObserver */
+/* global MutationObserver, getSelection */
 
+import { fromRelativePosition } from '../../Util/relativePosition.js'
 import Binding from '../Binding.js'
 import { createAssociation, removeAssociation } from './util.js'
-import { beforeTransactionSelectionFixer, afterTransactionSelectionFixer } from './selection.js'
+import { beforeTransactionSelectionFixer, afterTransactionSelectionFixer, getCurrentRelativeSelection } from './selection.js'
 import { defaultFilter, applyFilterOnType } from './filter.js'
 import typeObserver from './typeObserver.js'
 import domObserver from './domObserver.js'
@@ -33,6 +34,7 @@ export default class DomBinding extends Binding {
     this.opts = opts
     opts.document = opts.document || document
     opts.hooks = opts.hooks || {}
+    this.scrollingElement = opts.scrollingElement || null
     /**
      * Maps each DOM element to the type that it is associated with.
      * @type {Map}
@@ -66,16 +68,25 @@ export default class DomBinding extends Binding {
       characterData: true,
       subtree: true
     })
+    this._currentSel = null
+    document.addEventListener('selectionchange', () => {
+      this._currentSel = getCurrentRelativeSelection(this)
+    })
     const y = type._y
+    this.y = y
     // Force flush dom changes before Type changes are applied (they might
     // modify the dom)
     this._beforeTransactionHandler = (y, transaction, remote) => {
       this._domObserver(this._mutationObserver.takeRecords())
-      beforeTransactionSelectionFixer(y, this, transaction, remote)
+      this._mutualExclude(() => {
+        beforeTransactionSelectionFixer(this, remote)
+      })
     }
     y.on('beforeTransaction', this._beforeTransactionHandler)
     this._afterTransactionHandler = (y, transaction, remote) => {
-      afterTransactionSelectionFixer(y, this, transaction, remote)
+      this._mutualExclude(() => {
+        afterTransactionSelectionFixer(this, remote)
+      })
       // remove associations
       // TODO: this could be done more efficiently
       // e.g. Always delete using the following approach, or removeAssociation
@@ -105,17 +116,6 @@ export default class DomBinding extends Binding {
     createAssociation(this, target, type)
   }
 
-  /**
-   * Enables the smart scrolling functionality for a Dom Binding.
-   * This is useful when YXml is bound to a shared editor. When activated,
-   * the viewport will be changed to accommodate remote changes.
-   *
-   * @param {Element} scrollElement The node that is
-   */
-  enableSmartScrolling (scrollElement) {
-    // @TODO: implement smart scrolling
-  }
-
   /**
    * NOTE: currently does not apply filter to existing elements!
    * @param {FilterFunction} filter The filter function to use from now on.
@@ -125,27 +125,81 @@ export default class DomBinding extends Binding {
     // TODO: apply filter to all elements
   }
 
+  _getUndoStackInfo () {
+    return this.getSelection()
+  }
+
+  _restoreUndoStackInfo (info) {
+    this.restoreSelection(info)
+  }
+
+  getSelection () {
+    return this._currentSel
+  }
+
+  restoreSelection (selection) {
+    if (selection !== null) {
+      const { to, from } = selection
+      /**
+       * There is little information on the difference between anchor/focus and base/extent.
+       * MDN doesn't even mention base/extent anymore.. though you still have to call
+       * setBaseAndExtent to change the selection..
+       * I can observe that base/extend refer to notes higher up in the xml hierachy.
+       * Espesially for undo/redo this is preferred. If this becomes a problem in the future,
+       * we should probably go back to anchor/focus.
+       */
+      const browserSelection = getSelection()
+      let { baseNode, baseOffset, extentNode, extentOffset } = browserSelection
+      if (from !== null) {
+        let sel = fromRelativePosition(this.y, from)
+        if (sel !== null) {
+          let node = this.typeToDom.get(sel.type)
+          let offset = sel.offset
+          if (node !== baseNode || offset !== baseOffset) {
+            baseNode = node
+            baseOffset = offset
+          }
+        }
+      }
+      if (to !== null) {
+        let sel = fromRelativePosition(this.y, to)
+        if (sel !== null) {
+          let node = this.typeToDom.get(sel.type)
+          let offset = sel.offset
+          if (node !== extentNode || offset !== extentOffset) {
+            extentNode = node
+            extentOffset = offset
+          }
+        }
+      }
+      browserSelection.setBaseAndExtent(
+        baseNode,
+        baseOffset,
+        extentNode,
+        extentOffset
+      )
+    }
+  }
+
   /**
    * Remove all properties that are handled by this class.
    */
   destroy () {
     this.domToType = null
     this.typeToDom = null
-    this.type.unobserve(this._typeObserver)
+    this.type.unobserveDeep(this._typeObserver)
     this._mutationObserver.disconnect()
     const y = this.type._y
     y.off('beforeTransaction', this._beforeTransactionHandler)
     y.off('beforeObserverCalls', this._beforeObserverCallsHandler)
-    y.off('afterObserverCalls', this._afterObserverCallsHandler)
     y.off('afterTransaction', this._afterTransactionHandler)
     super.destroy()
   }
 }
-
-  /**
-   * A filter defines which elements and attributes to share.
-   * Return null if the node should be filtered. Otherwise return the Map of
-   * accepted attributes.
-   *
-   * @typedef {function(nodeName: String, attrs: Map): Map|null} FilterFunction
-   */
+/**
+ * A filter defines which elements and attributes to share.
+ * Return null if the node should be filtered. Otherwise return the Map of
+ * accepted attributes.
+ *
+ * @typedef {function(nodeName: String, attrs: Map): Map|null} FilterFunction
+ */

src/Bindings/DomBinding/domObserver.js

@@ -60,8 +60,8 @@ function applyChangesFromDom (binding, dom, yxml, _document) {
             removeAssociation(binding, childNode, childType)
           } else {
             // child was moved to a different position.
-            childType._delete(y)
             removeAssociation(binding, childNode, childType)
+            childType._delete(y)
           }
           prevExpectedType = insertNodeHelper(yxml, prevExpectedType, childNode, _document, binding)
         } else {
@@ -90,8 +90,19 @@ export default function domObserver (mutations, _document) {
       mutations.forEach(mutation => {
         const dom = mutation.target
         const yxml = this.domToType.get(dom)
-        if (yxml === false || yxml === undefined || yxml.constructor === YXmlHook) {
-          // dom element is filtered
+        if (yxml === undefined) { // In case yxml is undefined, we double check if we forgot to bind the dom
+          let parent = dom
+          let yParent
+          do {
+            parent = parent.parentElement
+            yParent = this.domToType.get(parent)
+          } while (yParent === undefined && parent !== null)
+          if (yParent !== false && yParent !== undefined && yParent.constructor !== YXmlHook) {
+            diffChildren.add(parent)
+          }
+          return
+        } else if (yxml === false || yxml.constructor === YXmlHook) {
+          // dom element is filtered / a dom hook
           return
         }
         switch (mutation.type) {
@@ -125,9 +136,6 @@ export default function domObserver (mutations, _document) {
         }
       })
       for (let dom of diffChildren) {
-        if (dom.yOnChildrenChanged !== undefined) {
-          dom.yOnChildrenChanged()
-        }
         const yxml = this.domToType.get(dom)
         applyChangesFromDom(this, dom, yxml, _document)
       }

src/Bindings/DomBinding/domToType.js

@@ -1,5 +1,7 @@
 
-import { YXmlText, YXmlElement, YXmlHook } from '../../Types/YXml/YXml.js'
+import YXmlText from '../../Types/YXml/YXmlText.js'
+import YXmlHook from '../../Types/YXml/YXmlHook.js'
+import YXmlElement from '../../Types/YXml/YXmlElement.js'
 import { createAssociation, domsToTypes } from './util.js'
 import { filterDomAttributes, defaultFilter } from './filter.js'
 

src/Bindings/DomBinding/selection.js

@@ -1,84 +1,35 @@
 /* globals getSelection */
 
-import { getRelativePosition, fromRelativePosition } from '../../Util/relativePosition.js'
+import { getRelativePosition } from '../../Util/relativePosition.js'
 
-let browserSelection = null
 let relativeSelection = null
 
-/**
- * @private
- */
-export let beforeTransactionSelectionFixer
-if (typeof getSelection !== 'undefined') {
-  beforeTransactionSelectionFixer = function _beforeTransactionSelectionFixer (y, domBinding, transaction, remote) {
-    if (!remote) {
-      return
-    }
-    relativeSelection = { from: null, to: null, fromY: null, toY: null }
-    browserSelection = getSelection()
-    const anchorNode = browserSelection.anchorNode
-    const anchorNodeType = domBinding.domToType.get(anchorNode)
-    if (anchorNode !== null && anchorNodeType !== undefined) {
-      relativeSelection.from = getRelativePosition(anchorNodeType, browserSelection.anchorOffset)
-      relativeSelection.fromY = anchorNodeType._y
-    }
-    const focusNode = browserSelection.focusNode
-    const focusNodeType = domBinding.domToType.get(focusNode)
-    if (focusNode !== null && focusNodeType !== undefined) {
-      relativeSelection.to = getRelativePosition(focusNodeType, browserSelection.focusOffset)
-      relativeSelection.toY = focusNodeType._y
+function _getCurrentRelativeSelection (domBinding) {
+  const { baseNode, baseOffset, extentNode, extentOffset } = getSelection()
+  const baseNodeType = domBinding.domToType.get(baseNode)
+  const extentNodeType = domBinding.domToType.get(extentNode)
+  if (baseNodeType !== undefined && extentNodeType !== undefined) {
+    return {
+      from: getRelativePosition(baseNodeType, baseOffset),
+      to: getRelativePosition(extentNodeType, extentOffset)
     }
   }
-} else {
-  beforeTransactionSelectionFixer = function _fakeBeforeTransactionSelectionFixer () {}
+  return null
+}
+
+export const getCurrentRelativeSelection = typeof getSelection !== 'undefined' ? _getCurrentRelativeSelection : () => null
+
+export function beforeTransactionSelectionFixer (domBinding, remote) {
+  if (remote) {
+    relativeSelection = getCurrentRelativeSelection(domBinding)
+  }
 }
 
 /**
  * @private
  */
-export function afterTransactionSelectionFixer (y, domBinding, transaction, remote) {
-  if (relativeSelection === null || !remote) {
-    return
-  }
-  const to = relativeSelection.to
-  const from = relativeSelection.from
-  const fromY = relativeSelection.fromY
-  const toY = relativeSelection.toY
-  let shouldUpdate = false
-  let anchorNode = browserSelection.anchorNode
-  let anchorOffset = browserSelection.anchorOffset
-  let focusNode = browserSelection.focusNode
-  let focusOffset = browserSelection.focusOffset
-  if (from !== null) {
-    let sel = fromRelativePosition(fromY, from)
-    if (sel !== null) {
-      let node = domBinding.typeToDom.get(sel.type)
-      let offset = sel.offset
-      if (node !== anchorNode || offset !== anchorOffset) {
-        anchorNode = node
-        anchorOffset = offset
-        shouldUpdate = true
-      }
-    }
-  }
-  if (to !== null) {
-    let sel = fromRelativePosition(toY, to)
-    if (sel !== null) {
-      let node = domBinding.typeToDom.get(sel.type)
-      let offset = sel.offset
-      if (node !== focusNode || offset !== focusOffset) {
-        focusNode = node
-        focusOffset = offset
-        shouldUpdate = true
-      }
-    }
-  }
-  if (shouldUpdate) {
-    browserSelection.setBaseAndExtent(
-      anchorNode,
-      anchorOffset,
-      focusNode,
-      focusOffset
-    )
+export function afterTransactionSelectionFixer (domBinding, remote) {
+  if (relativeSelection !== null && remote) {
+    domBinding.restoreSelection(relativeSelection)
   }
 }

src/Bindings/DomBinding/typeObserver.js

@@ -1,20 +1,55 @@
+/* global getSelection */
 
 import YXmlText from '../../Types/YXml/YXmlText.js'
 import YXmlHook from '../../Types/YXml/YXmlHook.js'
 import { removeDomChildrenUntilElementFound } from './util.js'
 
+function findScrollReference (scrollingElement) {
+  if (scrollingElement !== null) {
+    let anchor = getSelection().anchorNode
+    if (anchor == null) {
+      let children = scrollingElement.children // only iterate through non-text nodes
+      for (let i = 0; i < children.length; i++) {
+        const elem = children[i]
+        const rect = elem.getBoundingClientRect()
+        if (rect.top >= 0) {
+          return { elem, top: rect.top }
+        }
+      }
+    } else {
+      if (anchor.nodeType === document.TEXT_NODE) {
+        anchor = anchor.parentElement
+      }
+      const top = anchor.getBoundingClientRect().top
+      return { elem: anchor, top: top }
+    }
+  }
+  return null
+}
+
+function fixScroll (scrollingElement, ref) {
+  if (ref !== null) {
+    const { elem, top } = ref
+    const currentTop = elem.getBoundingClientRect().top
+    const newScroll = scrollingElement.scrollTop + currentTop - top
+    if (newScroll >= 0) {
+      scrollingElement.scrollTop = newScroll
+    }
+  }
+}
+
 /**
  * @private
  */
 export default function typeObserver (events) {
   this._mutualExclude(() => {
+    const scrollRef = findScrollReference(this.scrollingElement)
     events.forEach(event => {
       const yxml = event.target
       const dom = this.typeToDom.get(yxml)
       if (dom !== undefined && dom !== false) {
         if (yxml.constructor === YXmlText) {
           dom.nodeValue = yxml.toString()
-          // TODO: use hasOwnProperty instead of === undefined check
         } else if (event.attributesChanged !== undefined) {
           // update attributes
           event.attributesChanged.forEach(attributeName => {
@@ -59,5 +94,6 @@ export default function typeObserver (events) {
         }
       }
     })
+    fixScroll(this.scrollingElement, scrollRef)
   })
 }

src/MessageHandler/integrateRemoteStructs.js

@@ -25,7 +25,7 @@ function _integrateRemoteStructHelper (y, struct) {
     if (y.ss.getState(id.user) > id.clock) {
       return
     }
-    if (struct.constructor === GC || (struct._parent.constructor !== GC && struct._parent._deleted === false)) {
+    if (!y.gcEnabled || struct.constructor === GC || (struct._parent.constructor !== GC && struct._parent._deleted === false)) {
       // Is either a GC or Item with an undeleted parent
       // save to integrate
       struct._integrate(y)

src/MessageHandler/messageToString.js

@@ -61,5 +61,5 @@ export function logID (id) {
 export function logItemHelper (name, item, append) {
   const left = item._left !== null ? item._left._lastId : null
   const origin = item._origin !== null ? item._origin._lastId : null
-  return `${name}(id:${logID(item._id)},start:${logID(item._start)},left:${logID(left)},origin:${logID(origin)},right:${logID(item._right)},parent:${logID(item._parent)},parentSub:${item._parentSub}${append !== undefined ? ' - ' + append : ''})`
+  return `${name}(id:${logID(item._id)},left:${logID(left)},origin:${logID(origin)},right:${logID(item._right)},parent:${logID(item._parent)},parentSub:${item._parentSub}${append !== undefined ? ' - ' + append : ''})`
 }

src/Struct/Item.js

@@ -87,7 +87,7 @@ export default class Item {
      * If the parent refers to this item with some kind of key (e.g. YMap, the
      * key is specified here. The key is then used to refer to the list in which
      * to insert this item. If `parentSub = null` type._start is the list in
-     * which to insert to. Otherwise it is `parent._start`.
+     * which to insert to. Otherwise it is `parent._map`.
      * @type {String}
      */
     this._parentSub = null
@@ -120,17 +120,29 @@ export default class Item {
    *
    * @private
    */
-  _redo (y) {
+  _redo (y, redoitems) {
     if (this._redone !== null) {
       return this._redone
     }
     let struct = this._copy()
-    let left = this._left
-    let right = this
+    let left, right
+    if (this._parentSub === null) {
+      // Is an array item. Insert at the old position
+      left = this._left
+      right = this
+    } else {
+      // Is a map item. Insert at the start
+      left = null
+      right = this._parent._map.get(this._parentSub)
+      right._delete(y)
+    }
     let parent = this._parent
     // make sure that parent is redone
     if (parent._deleted === true && parent._redone === null) {
-      parent._redo(y)
+      // try to undo parent if it will be undone anyway
+      if (!redoitems.has(parent) || !parent._redo(y, redoitems)) {
+        return false
+      }
     }
     if (parent._redone !== null) {
       parent = parent._redone
@@ -157,7 +169,7 @@ export default class Item {
     struct._parentSub = this._parentSub
     struct._integrate(y)
     this._redone = struct
-    return struct
+    return true
   }
 
   /**

src/Struct/Type.js

@@ -217,8 +217,8 @@ export default class Type extends Item {
    *                                         collect the children of this type.
    */
   _delete (y, createDelete, gcChildren) {
-    if (gcChildren === undefined) {
-      gcChildren = y._hasUndoManager === false
+    if (gcChildren === undefined || !y.gcEnabled) {
+      gcChildren = y._hasUndoManager === false && y.gcEnabled
     }
     super._delete(y, createDelete, gcChildren)
     y._transaction.changedTypes.delete(this)

src/Types/YText/YText.js

@@ -155,7 +155,7 @@ function insertAttributes (y, parent, left, right, attributes, currentAttributes
  */
 function insertText (y, text, parent, left, right, currentAttributes, attributes) {
   for (let [key] of currentAttributes) {
-    if (attributes.hasOwnProperty(key) === false) {
+    if (attributes[key] === undefined) {
       attributes[key] = null
     }
   }
@@ -189,8 +189,9 @@ function formatText (y, length, parent, left, right, currentAttributes, attribut
     if (right._deleted === false) {
       switch (right.constructor) {
         case ItemFormat:
-          if (attributes.hasOwnProperty(right.key)) {
-            if (attributes[right.key] === right.value) {
+          const attr = attributes[right.key]
+          if (attr !== undefined) {
+            if (attr === right.value) {
               negatedAttributes.delete(right.key)
             } else {
               negatedAttributes.set(right.key, right.value)
@@ -253,7 +254,7 @@ function deleteText (y, length, parent, left, right, currentAttributes) {
  * @typedef {Array<Object>} Delta
  */
 
- /**
+/**
   * Attributes that can be assigned to a selection of text.
   *
   * @example
@@ -405,8 +406,9 @@ class YTextEvent extends YArrayEvent {
                 }
               } else if (item._deleted === false) {
                 oldAttributes.set(item.key, item.value)
-                if (attributes.hasOwnProperty(item.key)) {
-                  if (attributes[item.key] !== item.value) {
+                const attr = attributes[item.key]
+                if (attr !== undefined) {
+                  if (attr !== item.value) {
                     if (action === 'retain') {
                       addOp()
                     }
@@ -433,7 +435,7 @@ class YTextEvent extends YArrayEvent {
         addOp()
         while (this._delta.length > 0) {
           let lastOp = this._delta[this._delta.length - 1]
-          if (lastOp.hasOwnProperty('retain') && !lastOp.hasOwnProperty('attributes')) {
+          if (lastOp.retain !== undefined && lastOp.attributes === undefined) {
             // retain delta's if they don't assign attributes
             this._delta.pop()
           } else {
@@ -505,11 +507,11 @@ export default class YText extends YArray {
       const currentAttributes = new Map()
       for (let i = 0; i < delta.length; i++) {
         let op = delta[i]
-        if (op.hasOwnProperty('insert')) {
+        if (op.insert !== undefined) {
           ;[left, right] = insertText(y, op.insert, this, left, right, currentAttributes, op.attributes || {})
-        } else if (op.hasOwnProperty('retain')) {
+        } else if (op.retain !== undefined) {
           ;[left, right] = formatText(y, op.retain, this, left, right, currentAttributes, op.attributes || {})
-        } else if (op.hasOwnProperty('delete')) {
+        } else if (op.delete !== undefined) {
           ;[left, right] = deleteText(y, op.delete, this, left, right, currentAttributes)
         }
       }

src/Types/YXml/YXml.js

@@ -1,12 +0,0 @@
-
-import YXmlFragment from './YXmlFragment.js'
-import YXmlElement from './YXmlElement.js'
-import YXmlHook from './YXmlHook.js'
-
-export { default as YXmlFragment } from './YXmlFragment.js'
-export { default as YXmlElement } from './YXmlElement.js'
-export { default as YXmlText } from './YXmlText.js'
-export { default as YXmlHook } from './YXmlHook.js'
-
-YXmlFragment._YXmlElement = YXmlElement
-YXmlFragment._YXmlHook = YXmlHook

src/Types/YXml/YXmlElement.js

@@ -1,5 +1,5 @@
 import YMap from '../YMap/YMap.js'
-import { YXmlFragment } from './YXml.js'
+import YXmlFragment from './YXmlFragment.js'
 import { createAssociation } from '../../Bindings/DomBinding/util.js'
 
 /**
@@ -186,3 +186,5 @@ export default class YXmlElement extends YXmlFragment {
     return dom
   }
 }
+
+YXmlFragment._YXmlElement = YXmlElement

src/Util/UndoManager.js

@@ -2,7 +2,7 @@ import ID from './ID/ID.js'
 import isParentOf from './isParentOf.js'
 
 class ReverseOperation {
-  constructor (y, transaction) {
+  constructor (y, transaction, bindingInfos) {
     this.created = new Date()
     const beforeState = transaction.beforeState
     if (beforeState.has(y.userID)) {
@@ -12,15 +12,26 @@ class ReverseOperation {
       this.toState = null
       this.fromState = null
     }
-    this.deletedStructs = transaction.deletedStructs
+    this.deletedStructs = new Set()
+    transaction.deletedStructs.forEach(struct => {
+      this.deletedStructs.add({
+        from: struct._id,
+        len: struct._length
+      })
+    })
+    /**
+     * Maps from binding to binding information (e.g. cursor information)
+     */
+    this.bindingInfos = bindingInfos
   }
 }
 
 function applyReverseOperation (y, scope, reverseBuffer) {
   let performedUndo = false
+  let undoOp
   y.transact(() => {
     while (!performedUndo && reverseBuffer.length > 0) {
-      let undoOp = reverseBuffer.pop()
+      undoOp = reverseBuffer.pop()
       // make sure that it is possible to iterate {from}-{to}
       if (undoOp.fromState !== null) {
         y.os.getItemCleanStart(undoOp.fromState)
@@ -35,23 +46,39 @@ function applyReverseOperation (y, scope, reverseBuffer) {
           }
         })
       }
-      for (let op of undoOp.deletedStructs) {
-        if (
-          isParentOf(scope, op) &&
-          op._parent !== y &&
-          (
-            op._id.user !== y.userID ||
-            undoOp.fromState === null ||
-            op._id.clock < undoOp.fromState.clock ||
-            op._id.clock > undoOp.toState.clock
-          )
-        ) {
-          performedUndo = true
-          op._redo(y)
-        }
+      const redoitems = new Set()
+      for (let del of undoOp.deletedStructs) {
+        const fromState = del.from
+        const toState = new ID(fromState.user, fromState.clock + del.len - 1)
+        y.os.getItemCleanStart(fromState)
+        y.os.getItemCleanEnd(toState)
+        y.os.iterate(fromState, toState, op => {
+          if (
+            isParentOf(scope, op) &&
+            op._parent !== y &&
+            (
+              op._id.user !== y.userID ||
+              undoOp.fromState === null ||
+              op._id.clock < undoOp.fromState.clock ||
+              op._id.clock > undoOp.toState.clock
+            )
+          ) {
+            redoitems.add(op)
+          }
+        })
       }
+      redoitems.forEach(op => {
+        const opUndone = op._redo(y, redoitems)
+        performedUndo = performedUndo || opUndone
+      })
     }
   })
+  if (performedUndo) {
+    // should be performed after the undo transaction
+    undoOp.bindingInfos.forEach((info, binding) => {
+      binding._restoreUndoStackInfo(info)
+    })
+  }
   return performedUndo
 }
 
@@ -66,6 +93,7 @@ export default class UndoManager {
    */
   constructor (scope, options = {}) {
     this.options = options
+    this._bindings = new Set(options.bindings)
     options.captureTimeout = options.captureTimeout == null ? 500 : options.captureTimeout
     this._undoBuffer = []
     this._redoBuffer = []
@@ -76,16 +104,28 @@ export default class UndoManager {
     const y = scope._y
     this.y = y
     y._hasUndoManager = true
+    let bindingInfos
+    y.on('beforeTransaction', (y, transaction, remote) => {
+      if (!remote) {
+        // Store binding information before transaction is executed
+        // By restoring the binding information, we can make sure that the state
+        // before the transaction can be recovered
+        bindingInfos = new Map()
+        this._bindings.forEach(binding => {
+          bindingInfos.set(binding, binding._getUndoStackInfo())
+        })
+      }
+    })
     y.on('afterTransaction', (y, transaction, remote) => {
       if (!remote && transaction.changedParentTypes.has(scope)) {
-        let reverseOperation = new ReverseOperation(y, transaction)
+        let reverseOperation = new ReverseOperation(y, transaction, bindingInfos)
         if (!this._undoing) {
           let lastUndoOp = this._undoBuffer.length > 0 ? this._undoBuffer[this._undoBuffer.length - 1] : null
           if (
             this._redoing === false &&
             this._lastTransactionWasUndo === false &&
             lastUndoOp !== null &&
-            reverseOperation.created - lastUndoOp.created <= options.captureTimeout
+            (options.captureTimeout < 0 || reverseOperation.created - lastUndoOp.created <= options.captureTimeout)
           ) {
             lastUndoOp.created = reverseOperation.created
             if (reverseOperation.toState !== null) {
@@ -110,6 +150,13 @@ export default class UndoManager {
     })
   }
 
+  /**
+   * Enforce that the next change is created as a separate item in the undo stack
+   */
+  flushChanges () {
+    this._lastTransactionWasUndo = true
+  }
+
   /**
    * Undo the last locally created change.
    */

src/Util/relativePosition.js

@@ -76,7 +76,10 @@ export function fromRelativePosition (y, rpos) {
     } else {
       id = new RootID(rpos[3], rpos[4])
     }
-    const type = y.os.get(id)
+    let type = y.os.get(id)
+    while (type._redone !== null) {
+      type = type._redone
+    }
     if (type === null || type.constructor === GC) {
       return null
     }
@@ -87,12 +90,16 @@ export function fromRelativePosition (y, rpos) {
   } else {
     let offset = 0
     let struct = y.os.findNodeWithUpperBound(new ID(rpos[0], rpos[1])).val
+    const diff = rpos[1] - struct._id.clock
+    while (struct._redone !== null) {
+      struct = struct._redone
+    }
     const parent = struct._parent
     if (struct.constructor === GC || parent._deleted) {
       return null
     }
     if (!struct._deleted) {
-      offset = rpos[1] - struct._id.clock
+      offset = diff
     }
     struct = struct._left
     while (struct !== null) {

src/Util/structReferences.js

@@ -1,7 +1,10 @@
 import YArray from '../Types/YArray/YArray.js'
 import YMap from '../Types/YMap/YMap.js'
 import YText from '../Types/YText/YText.js'
-import { YXmlFragment, YXmlElement, YXmlText, YXmlHook } from '../Types/YXml/YXml.js'
+import YXmlText from '../Types/YXml/YXmlText.js'
+import YXmlHook from '../Types/YXml/YXmlHook.js'
+import YXmlFragment from '../Types/YXml/YXmlFragment.js'
+import YXmlElement from '../Types/YXml/YXmlElement.js'
 
 import Delete from '../Struct/Delete.js'
 import ItemJSON from '../Struct/ItemJSON.js'

src/Y.dist.js

@@ -10,7 +10,10 @@ import Persistence from './Persistence.js'
 import YArray from './Types/YArray/YArray.js'
 import YMap from './Types/YMap/YMap.js'
 import YText from './Types/YText/YText.js'
-import { YXmlFragment, YXmlElement, YXmlText, YXmlHook } from './Types/YXml/YXml.js'
+import YXmlText from './Types/YXml/YXmlText.js'
+import YXmlHook from './Types/YXml/YXmlHook.js'
+import YXmlFragment from './Types/YXml/YXmlFragment.js'
+import YXmlElement from './Types/YXml/YXmlElement.js'
 import BinaryDecoder from './Util/Binary/Decoder.js'
 import { getRelativePosition, fromRelativePosition } from './Util/relativePosition.js'
 import { registerStruct } from './Util/structReferences.js'

src/Y.js

@@ -28,8 +28,9 @@ export { default as DomBinding } from './Bindings/DomBinding/DomBinding.js'
  * @param {AbstractPersistence} persistence Persistence adapter instance
  */
 export default class Y extends NamedEventHandler {
-  constructor (room, opts, persistence) {
+  constructor (room, opts, persistence, conf = {}) {
     super()
+    this.gcEnabled = conf.gc || false
     /**
      * The room name that this Yjs instance connects to.
      * @type {String}

test/y-array.tests.js

@@ -111,7 +111,7 @@ function compareEvent (t, is, should) {
     t.assert(
       should[key] === is[key] ||
       JSON.stringify(should[key]) === JSON.stringify(is[key])
-    , 'event works as expected'
+      , 'event works as expected'
     )
   }
 }