yonote/yjs
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working on snapshotting and version history

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This commit is contained in:
Kevin Jahns 2019-01-09 23:54:36 +01:00
parent ec58a99748
commit 77e479c03b
17 changed files with 648 additions and 378 deletions
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73
bindings/prosemirror.js
View File

@ -31,36 +31,56 @@ export const prosemirrorPluginKey = new PluginKey('yjs')
* @return {Plugin} Returns a prosemirror plugin that binds to this type * @return {Plugin} Returns a prosemirror plugin that binds to this type
*/ */
export const prosemirrorPlugin = yXmlFragment => { export const prosemirrorPlugin = yXmlFragment => {
const pluginState = {
type: yXmlFragment,
y: yXmlFragment._y,
binding: null
}
let changedInitialContent = false let changedInitialContent = false
const plugin = new Plugin({ const plugin = new Plugin({
key: prosemirrorPluginKey, key: prosemirrorPluginKey,
state: { state: {
init: (initargs, state) => { init: (initargs, state) => {
return pluginState return {
type: yXmlFragment,
y: yXmlFragment._y,
binding: null,
snapshot: null
}
}, },
apply: (tr, pluginState) => { apply: (tr, pluginState) => {
const change = tr.getMeta(prosemirrorPluginKey)
if (change !== undefined) {
pluginState = Object.assign({}, pluginState)
for (let key in change) {
pluginState[key] = change[key]
}
}
if (pluginState.binding !== null) {
if (change !== undefined && change.snapshot !== undefined) {
// snapshot changed, rerender next
setTimeout(() => {
pluginState.binding._renderSnapshot(change.snapshot)
}, 0)
} else if (pluginState.snapshot == null) {
// only apply if no snapshot active
// update Yjs state when apply is called. We need to do this here to compute the correct cursor decorations with the cursor plugin // update Yjs state when apply is called. We need to do this here to compute the correct cursor decorations with the cursor plugin
if (pluginState.binding !== null && (changedInitialContent || tr.doc.content.size > 4)) { if (changedInitialContent || tr.doc.content.size > 4) {
changedInitialContent = true changedInitialContent = true
pluginState.binding._prosemirrorChanged(tr.doc) pluginState.binding._prosemirrorChanged(tr.doc)
} }
}
}
return pluginState return pluginState
} }
}, },
view: view => { view: view => {
const binding = new ProsemirrorBinding(yXmlFragment, view) const binding = new ProsemirrorBinding(yXmlFragment, view)
pluginState.binding = binding view.dispatch(view.state.tr.setMeta(prosemirrorPluginKey, { binding }))
return { return {
update: () => { update: () => {
const pluginState = plugin.getState(view.state)
if (pluginState.snapshot == null) {
if (changedInitialContent || view.state.doc.content.size > 4) { if (changedInitialContent || view.state.doc.content.size > 4) {
changedInitialContent = true changedInitialContent = true
binding._prosemirrorChanged(view.state.doc) binding._prosemirrorChanged(view.state.doc)
} }
}
}, },
destroy: () => { destroy: () => {
binding.destroy() binding.destroy()
@ -301,8 +321,18 @@ export class ProsemirrorBinding {
}) })
yXmlFragment.observeDeep(this._observeFunction) yXmlFragment.observeDeep(this._observeFunction)
} }
_renderSnapshot (snapshot) {
// clear mapping because we are going to rerender
this.mapping = new Map()
this.mux(() => {
const fragmentContent = this.type.toArray(snapshot).map(t => createNodeFromYElement(t, this.prosemirrorView.state.schema, new Map(), snapshot)).filter(n => n !== null)
const tr = this.prosemirrorView.state.tr.replace(0, this.prosemirrorView.state.doc.content.size, new PModel.Slice(new PModel.Fragment(fragmentContent), 0, 0))
this.prosemirrorView.dispatch(tr)
})
}
_typeChanged (events, transaction) { _typeChanged (events, transaction) {
if (events.length === 0) { if (events.length === 0 || prosemirrorPluginKey.getState(this.prosemirrorView.state).snapshot != null) {
// drop out if snapshot is active
return return
} }
console.info('new types:', transaction.newTypes.size, 'deleted types:', transaction.deletedStructs.size, transaction.newTypes, transaction.deletedStructs) console.info('new types:', transaction.newTypes.size, 'deleted types:', transaction.deletedStructs.size, transaction.newTypes, transaction.deletedStructs)
@ -321,7 +351,7 @@ export class ProsemirrorBinding {
tr.setSelection(TextSelection.create(tr.doc, anchor, head)) tr.setSelection(TextSelection.create(tr.doc, anchor, head))
} }
} }
this.prosemirrorView.updateState(this.prosemirrorView.state.apply(tr)) this.prosemirrorView.dispatch(tr)
}) })
} }
_prosemirrorChanged (doc) { _prosemirrorChanged (doc) {
@ -335,16 +365,17 @@ export class ProsemirrorBinding {
} }
/** /**
* @privateMapping * @private
* @param {YXmlElement} el * @param {YXmlElement} el
* @param {PModel.Schema} schema * @param {PModel.Schema} schema
* @param {ProsemirrorMapping} mapping * @param {ProsemirrorMapping} mapping
* @param {HistorySnapshot} [snapshot]
* @return {PModel.Node} * @return {PModel.Node}
*/ */
export const createNodeIfNotExists = (el, schema, mapping) => { export const createNodeIfNotExists = (el, schema, mapping, snapshot) => {
const node = mapping.get(el) const node = mapping.get(el)
if (node === undefined) { if (node === undefined) {
return createNodeFromYElement(el, schema, mapping) return createNodeFromYElement(el, schema, mapping, snapshot)
} }
return node return node
} }
@ -354,18 +385,19 @@ export const createNodeIfNotExists = (el, schema, mapping) => {
* @param {YXmlElement} el * @param {YXmlElement} el
* @param {PModel.Schema} schema * @param {PModel.Schema} schema
* @param {ProsemirrorMapping} mapping * @param {ProsemirrorMapping} mapping
* @param {import('../protocols/history.js').HistorySnapshot} snapshot
* @return {PModel.Node | null} Returns node if node could be created. Otherwise it deletes the yjs type and returns null * @return {PModel.Node | null} Returns node if node could be created. Otherwise it deletes the yjs type and returns null
*/ */
export const createNodeFromYElement = (el, schema, mapping) => { export const createNodeFromYElement = (el, schema, mapping, snapshot) => {
const children = [] const children = []
el.toArray().forEach(type => { el.toArray(snapshot).forEach(type => {
if (type.constructor === YXmlElement) { if (type.constructor === YXmlElement) {
const n = createNodeIfNotExists(type, schema, mapping) const n = createNodeIfNotExists(type, schema, mapping, snapshot)
if (n !== null) { if (n !== null) {
children.push(n) children.push(n)
} }
} else { } else {
const ns = createTextNodesFromYText(type, schema, mapping) const ns = createTextNodesFromYText(type, schema, mapping, snapshot)
if (ns !== null) { if (ns !== null) {
ns.forEach(textchild => { ns.forEach(textchild => {
if (textchild !== null) { if (textchild !== null) {
@ -377,7 +409,7 @@ export const createNodeFromYElement = (el, schema, mapping) => {
}) })
let node let node
try { try {
node = schema.node(el.nodeName.toLowerCase(), el.getAttributes(), children) node = schema.node(el.nodeName.toLowerCase(), el.getAttributes(snapshot), children)
} catch (e) { } catch (e) {
// an error occured while creating the node. This is probably a result because of a concurrent action. // an error occured while creating the node. This is probably a result because of a concurrent action.
// delete the node and do not push to children // delete the node and do not push to children
@ -395,11 +427,12 @@ export const createNodeFromYElement = (el, schema, mapping) => {
* @param {YText} text * @param {YText} text
* @param {PModel.Schema} schema * @param {PModel.Schema} schema
* @param {ProsemirrorMapping} mapping * @param {ProsemirrorMapping} mapping
* @param {HistorySnapshot} [snapshot]
* @return {Array<PModel.Node>} * @return {Array<PModel.Node>}
*/ */
export const createTextNodesFromYText = (text, schema, mapping) => { export const createTextNodesFromYText = (text, schema, mapping, snapshot) => {
const nodes = [] const nodes = []
const deltas = text.toDelta() const deltas = text.toDelta(snapshot)
try { try {
for (let i = 0; i < deltas.length; i++) { for (let i = 0; i < deltas.length; i++) {
const delta = deltas[i] const delta = deltas[i]

68
examples/prosemirror-history.js Normal file
View File

@ -0,0 +1,68 @@
import {Plugin} from "prosemirror-state"
import crel from 'crel'
import * as Y from '../index.js'
import { prosemirrorPluginKey } from '../bindings/prosemirror.js'
import * as encoding from '../lib/encoding.js'
import * as decoding from '../lib/decoding.js'
import * as historyProtocol from '../protocols/history.js'
export const noteHistoryPlugin = new Plugin({
view (editorView) { return new NoteHistoryPlugin(editorView) }
})
const createWrapper = () => {
const wrapper = crel('div', { style: 'display: flex' })
const historyContainer = crel('div', { style: 'align-self: baseline; flex-basis: 250px;', class: 'shared-history' })
wrapper.insertBefore(historyContainer, null)
return { wrapper, historyContainer }
}
class NoteHistoryPlugin {
constructor(editorView) {
this.editorView = editorView
const { historyContainer, wrapper } = createWrapper()
this.wrapper = wrapper
this.historyContainer = historyContainer
const n = editorView.dom.parentNode.parentNode
n.parentNode.replaceChild(this.wrapper, n)
n.style['flex-grow'] = '1'
wrapper.insertBefore(n, this.wrapper.firstChild)
this.render()
const y = prosemirrorPluginKey.getState(this.editorView.state).y
const history = y.define('history', Y.Array)
history.observe(this.render.bind(this))
}
render () {
const y = prosemirrorPluginKey.getState(this.editorView.state).y
const history = y.define('history', Y.Array).toArray()
const fragment = document.createDocumentFragment()
const snapshotBtn = crel('button', { type: 'button' }, ['snapshot'])
snapshotBtn.addEventListener('click', this.snapshot.bind(this))
fragment.insertBefore(snapshotBtn, null)
history.forEach(buf => {
const decoder = decoding.createDecoder(buf)
const snapshot = historyProtocol.readHistorySnapshot(decoder)
const date = new Date(decoding.readUint32(decoder) * 1000)
const a = crel('a', [
'• '+ date.toUTCString()
])
const el = crel('div', [ a ])
a.addEventListener('click', () => {
console.log('setting snapshot')
this.editorView.dispatch(this.editorView.state.tr.setMeta(prosemirrorPluginKey, { snapshot }))
})
fragment.insertBefore(el, null)
})
this.historyContainer.innerHTML = ''
this.historyContainer.insertBefore(fragment, null)
}
snapshot () {
const y = prosemirrorPluginKey.getState(this.editorView.state).y
const history = y.define('history', Y.Array)
const encoder = encoding.createEncoder()
historyProtocol.writeHistorySnapshot(encoder, y)
encoding.writeUint32(encoder, Math.floor(Date.now() / 1000))
history.push([encoding.toBuffer(encoder)])
}
}

3
examples/prosemirror.js
View File

@ -9,6 +9,7 @@ import { EditorView } from 'prosemirror-view'
import { DOMParser } from 'prosemirror-model' import { DOMParser } from 'prosemirror-model'
import { schema } from 'prosemirror-schema-basic' import { schema } from 'prosemirror-schema-basic'
import { exampleSetup } from 'prosemirror-example-setup' import { exampleSetup } from 'prosemirror-example-setup'
import { noteHistoryPlugin } from './prosemirror-history.js'
const provider = new WebsocketProvider(conf.serverAddress) const provider = new WebsocketProvider(conf.serverAddress)
const ydocument = provider.get('prosemirror') const ydocument = provider.get('prosemirror')
@ -17,7 +18,7 @@ const type = ydocument.define('prosemirror', Y.XmlFragment)
const prosemirrorView = new EditorView(document.querySelector('#editor'), { const prosemirrorView = new EditorView(document.querySelector('#editor'), {
state: EditorState.create({ state: EditorState.create({
doc: DOMParser.fromSchema(schema).parse(document.querySelector('#content')), doc: DOMParser.fromSchema(schema).parse(document.querySelector('#content')),
plugins: exampleSetup({schema}).concat([prosemirrorPlugin(type), cursorPlugin]) plugins: exampleSetup({schema}).concat([prosemirrorPlugin(type), cursorPlugin, noteHistoryPlugin])
}) })
}) })

3
index.js
View File

@ -5,6 +5,7 @@ import { ItemJSON } from './structs/ItemJSON.js'
import { ItemString } from './structs/ItemString.js' import { ItemString } from './structs/ItemString.js'
import { ItemFormat } from './structs/ItemFormat.js' import { ItemFormat } from './structs/ItemFormat.js'
import { ItemEmbed } from './structs/ItemEmbed.js' import { ItemEmbed } from './structs/ItemEmbed.js'
import { ItemBinary } from './structs/ItemBinary.js'
import { GC } from './structs/GC.js' import { GC } from './structs/GC.js'
import { YArray } from './types/YArray.js' import { YArray } from './types/YArray.js'
@ -53,3 +54,5 @@ registerStruct(9, YXmlElement)
registerStruct(10, YXmlText) registerStruct(10, YXmlText)
registerStruct(11, YXmlHook) registerStruct(11, YXmlHook)
registerStruct(12, ItemEmbed) registerStruct(12, ItemEmbed)
registerStruct(13, ItemBinary)

191
package-lock.json generated
View File

@ -100,7 +100,6 @@
"version": "5.0.0", "version": "5.0.0",
"resolved": "https://registry.npmjs.org/abstract-leveldown/-/abstract-leveldown-5.0.0.tgz", "resolved": "https://registry.npmjs.org/abstract-leveldown/-/abstract-leveldown-5.0.0.tgz",
"integrity": "sha512-5mU5P1gXtsMIXg65/rsYGsi93+MlogXZ9FA8JnwKurHQg64bfXwGYVdVdijNTVNOlAsuIiOwHdvFFD5JqCJQ7A==", "integrity": "sha512-5mU5P1gXtsMIXg65/rsYGsi93+MlogXZ9FA8JnwKurHQg64bfXwGYVdVdijNTVNOlAsuIiOwHdvFFD5JqCJQ7A==",
"dev": true,
"requires": { "requires": {
"xtend": "~4.0.0" "xtend": "~4.0.0"
} }
@ -201,8 +200,7 @@
"ansi-regex": { "ansi-regex": {
"version": "2.1.1", "version": "2.1.1",
"resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz", "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
"integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=", "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
"dev": true
}, },
"ansi-styles": { "ansi-styles": {
"version": "2.2.1", "version": "2.2.1",
@ -239,13 +237,13 @@
"version": "1.2.0", "version": "1.2.0",
"resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz", "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
"integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==", "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
"dev": true "optional": true
}, },
"are-we-there-yet": { "are-we-there-yet": {
"version": "1.1.5", "version": "1.1.5",
"resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz", "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
"integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==", "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
"dev": true, "optional": true,
"requires": { "requires": {
"delegates": "^1.0.0", "delegates": "^1.0.0",
"readable-stream": "^2.0.6" "readable-stream": "^2.0.6"
@ -1669,13 +1667,13 @@
"version": "1.3.1", "version": "1.3.1",
"resolved": "https://registry.npmjs.org/bindings/-/bindings-1.3.1.tgz", "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.3.1.tgz",
"integrity": "sha512-i47mqjF9UbjxJhxGf+pZ6kSxrnI3wBLlnGI2ArWJ4r0VrvDS7ZYXkprq/pLaBWYq4GM0r4zdHY+NNRqEMU7uew==", "integrity": "sha512-i47mqjF9UbjxJhxGf+pZ6kSxrnI3wBLlnGI2ArWJ4r0VrvDS7ZYXkprq/pLaBWYq4GM0r4zdHY+NNRqEMU7uew==",
"dev": true "optional": true
}, },
"bl": { "bl": {
"version": "1.2.2", "version": "1.2.2",
"resolved": "http://registry.npmjs.org/bl/-/bl-1.2.2.tgz", "resolved": "http://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
"integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==", "integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==",
"dev": true, "optional": true,
"requires": { "requires": {
"readable-stream": "^2.3.5", "readable-stream": "^2.3.5",
"safe-buffer": "^5.1.1" "safe-buffer": "^5.1.1"
@ -1685,13 +1683,13 @@
"version": "2.0.0", "version": "2.0.0",
"resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.0.tgz", "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.0.tgz",
"integrity": "sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw==", "integrity": "sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw==",
"dev": true "optional": true
}, },
"readable-stream": { "readable-stream": {
"version": "2.3.6", "version": "2.3.6",
"resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz", "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
"integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==", "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
"dev": true, "optional": true,
"requires": { "requires": {
"core-util-is": "~1.0.0", "core-util-is": "~1.0.0",
"inherits": "~2.0.3", "inherits": "~2.0.3",
@ -1706,7 +1704,7 @@
"version": "1.1.1", "version": "1.1.1",
"resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz", "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
"integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==", "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
"dev": true, "optional": true,
"requires": { "requires": {
"safe-buffer": "~5.1.0" "safe-buffer": "~5.1.0"
} }
@ -1750,7 +1748,7 @@
"version": "1.2.0", "version": "1.2.0",
"resolved": "https://registry.npmjs.org/buffer-alloc/-/buffer-alloc-1.2.0.tgz", "resolved": "https://registry.npmjs.org/buffer-alloc/-/buffer-alloc-1.2.0.tgz",
"integrity": "sha512-CFsHQgjtW1UChdXgbyJGtnm+O/uLQeZdtbDo8mfUgYXCHSM1wgrVxXm6bSyrUuErEb+4sYVGCzASBRot7zyrow==", "integrity": "sha512-CFsHQgjtW1UChdXgbyJGtnm+O/uLQeZdtbDo8mfUgYXCHSM1wgrVxXm6bSyrUuErEb+4sYVGCzASBRot7zyrow==",
"dev": true, "optional": true,
"requires": { "requires": {
"buffer-alloc-unsafe": "^1.1.0", "buffer-alloc-unsafe": "^1.1.0",
"buffer-fill": "^1.0.0" "buffer-fill": "^1.0.0"
@ -1760,13 +1758,13 @@
"version": "1.1.0", "version": "1.1.0",
"resolved": "https://registry.npmjs.org/buffer-alloc-unsafe/-/buffer-alloc-unsafe-1.1.0.tgz", "resolved": "https://registry.npmjs.org/buffer-alloc-unsafe/-/buffer-alloc-unsafe-1.1.0.tgz",
"integrity": "sha512-TEM2iMIEQdJ2yjPJoSIsldnleVaAk1oW3DBVUykyOLsEsFmEc9kn+SFFPz+gl54KQNxlDnAwCXosOS9Okx2xAg==", "integrity": "sha512-TEM2iMIEQdJ2yjPJoSIsldnleVaAk1oW3DBVUykyOLsEsFmEc9kn+SFFPz+gl54KQNxlDnAwCXosOS9Okx2xAg==",
"dev": true "optional": true
}, },
"buffer-fill": { "buffer-fill": {
"version": "1.0.0", "version": "1.0.0",
"resolved": "https://registry.npmjs.org/buffer-fill/-/buffer-fill-1.0.0.tgz", "resolved": "https://registry.npmjs.org/buffer-fill/-/buffer-fill-1.0.0.tgz",
"integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw=", "integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw=",
"dev": true "optional": true
}, },
"buffer-from": { "buffer-from": {
"version": "1.0.0", "version": "1.0.0",
@ -1893,7 +1891,7 @@
"version": "1.1.1", "version": "1.1.1",
"resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.1.tgz", "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.1.tgz",
"integrity": "sha512-j38EvO5+LHX84jlo6h4UzmOwi0UgW61WRyPtJz4qaadK5eY3BTS5TY/S1Stc3Uk2lIM6TPevAlULiEJwie860g==", "integrity": "sha512-j38EvO5+LHX84jlo6h4UzmOwi0UgW61WRyPtJz4qaadK5eY3BTS5TY/S1Stc3Uk2lIM6TPevAlULiEJwie860g==",
"dev": true "optional": true
}, },
"circular-json": { "circular-json": {
"version": "0.3.3", "version": "0.3.3",
@ -1932,12 +1930,13 @@
"version": "1.1.0", "version": "1.1.0",
"resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz", "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
"integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=", "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
"dev": true "optional": true
}, },
"codemirror": { "codemirror": {
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"integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==", "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
"dev": true,
"requires": { "requires": {
"safe-buffer": "~5.1.0" "safe-buffer": "~5.1.0"
} }
@ -7455,7 +7429,6 @@
"version": "3.0.1", "version": "3.0.1",
"resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz", "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
"integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=", "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
"dev": true,
"requires": { "requires": {
"ansi-regex": "^2.0.0" "ansi-regex": "^2.0.0"
} }
@ -7486,8 +7459,7 @@
"strip-json-comments": { "strip-json-comments": {
"version": "2.0.1", "version": "2.0.1",
"resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz", "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
"integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=", "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo="
"dev": true
}, },
"supports-color": { "supports-color": {
"version": "2.0.0", "version": "2.0.0",
@ -7563,7 +7535,7 @@
"version": "1.16.3", "version": "1.16.3",
"resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-1.16.3.tgz", "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-1.16.3.tgz",
"integrity": "sha512-NvCeXpYx7OsmOh8zIOP/ebG55zZmxLE0etfWRbWok+q2Qo8x/vOR/IJT1taADXPe+jsiu9axDb3X4B+iIgNlKw==", "integrity": "sha512-NvCeXpYx7OsmOh8zIOP/ebG55zZmxLE0etfWRbWok+q2Qo8x/vOR/IJT1taADXPe+jsiu9axDb3X4B+iIgNlKw==",
"dev": true, "optional": true,
"requires": { "requires": {
"chownr": "^1.0.1", "chownr": "^1.0.1",
"mkdirp": "^0.5.1", "mkdirp": "^0.5.1",
@ -7575,7 +7547,7 @@
"version": "1.0.3", "version": "1.0.3",
"resolved": "https://registry.npmjs.org/pump/-/pump-1.0.3.tgz", "resolved": "https://registry.npmjs.org/pump/-/pump-1.0.3.tgz",
"integrity": "sha512-8k0JupWme55+9tCVE+FS5ULT3K6AbgqrGa58lTT49RpyfwwcGedHqaC5LlQNdEAumn/wFsu6aPwkuPMioy8kqw==", "integrity": "sha512-8k0JupWme55+9tCVE+FS5ULT3K6AbgqrGa58lTT49RpyfwwcGedHqaC5LlQNdEAumn/wFsu6aPwkuPMioy8kqw==",
"dev": true, "optional": true,
"requires": { "requires": {
"end-of-stream": "^1.1.0", "end-of-stream": "^1.1.0",
"once": "^1.3.1" "once": "^1.3.1"
@ -7587,7 +7559,7 @@
"version": "1.6.2", "version": "1.6.2",
"resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-1.6.2.tgz", "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-1.6.2.tgz",
"integrity": "sha512-rzS0heiNf8Xn7/mpdSVVSMAWAoy9bfb1WOTYC78Z0UQKeKa/CWS8FOq0lKGNa8DWKAn9gxjCvMLYc5PGXYlK2A==", "integrity": "sha512-rzS0heiNf8Xn7/mpdSVVSMAWAoy9bfb1WOTYC78Z0UQKeKa/CWS8FOq0lKGNa8DWKAn9gxjCvMLYc5PGXYlK2A==",
"dev": true, "optional": true,
"requires": { "requires": {
"bl": "^1.0.0", "bl": "^1.0.0",
"buffer-alloc": "^1.2.0", "buffer-alloc": "^1.2.0",
@ -7629,7 +7601,7 @@
"version": "1.1.1", "version": "1.1.1",
"resolved": "https://registry.npmjs.org/to-buffer/-/to-buffer-1.1.1.tgz", "resolved": "https://registry.npmjs.org/to-buffer/-/to-buffer-1.1.1.tgz",
"integrity": "sha512-lx9B5iv7msuFYE3dytT+KE5tap+rNYw+K4jVkb9R/asAb+pbBSM17jtunHplhBe6RRJdZx3Pn2Jph24O32mOVg==", "integrity": "sha512-lx9B5iv7msuFYE3dytT+KE5tap+rNYw+K4jVkb9R/asAb+pbBSM17jtunHplhBe6RRJdZx3Pn2Jph24O32mOVg==",
"dev": true "optional": true
}, },
"to-fast-properties": { "to-fast-properties": {
"version": "1.0.3", "version": "1.0.3",
@ -7694,7 +7666,7 @@
"version": "0.6.0", "version": "0.6.0",
"resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz", "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
"integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=", "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
"dev": true, "optional": true,
"requires": { "requires": {
"safe-buffer": "^5.0.1" "safe-buffer": "^5.0.1"
} }
@ -7813,8 +7785,7 @@
"util-deprecate": { "util-deprecate": {
"version": "1.0.2", "version": "1.0.2",
"resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz", "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
"integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=", "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
"dev": true
}, },
"utils-merge": { "utils-merge": {
"version": "1.0.0", "version": "1.0.0",
@ -7928,13 +7899,13 @@
"version": "1.0.0", "version": "1.0.0",
"resolved": "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz", "resolved": "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz",
"integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs=", "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs=",
"dev": true "optional": true
}, },
"wide-align": { "wide-align": {
"version": "1.1.3", "version": "1.1.3",
"resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz", "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
"integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==", "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
"dev": true, "optional": true,
"requires": { "requires": {
"string-width": "^1.0.2 || 2" "string-width": "^1.0.2 || 2"
} }
@ -7942,8 +7913,7 @@
"wrappy": { "wrappy": {
"version": "1.0.2", "version": "1.0.2",
"resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz", "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
"integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=", "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
"dev": true
}, },
"write": { "write": {
"version": "0.2.1", "version": "0.2.1",
@ -7979,8 +7949,7 @@
"xtend": { "xtend": {
"version": "4.0.1", "version": "4.0.1",
"resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz", "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
"integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=", "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
"dev": true
}, },
"yallist": { "yallist": {
"version": "2.1.2", "version": "2.1.2",

3
package.json
View File

@ -97,7 +97,8 @@
"rollup-watch": "^3.2.2", "rollup-watch": "^3.2.2",
"standard": "^11.0.1", "standard": "^11.0.1",
"tui-jsdoc-template": "^1.2.2", "tui-jsdoc-template": "^1.2.2",
"codemirror": "^5.42.0" "codemirror": "^5.42.0",
"crel": "^3.1.0"
}, },
"optionalDependencies": { "optionalDependencies": {
"level": "^4.0.0", "level": "^4.0.0",

33
protocols/history.js Normal file
View File

@ -0,0 +1,33 @@
import * as encoding from '../lib/encoding.js'
import * as decoding from '../lib/decoding.js'
import { Y } from '../utils/Y.js' // eslint-disable-line
import { writeDeleteStore, readFreshDeleteStore, DeleteStore } from '../utils/DeleteStore.js' // eslint-disable-line
import { writeStateMap, readStateMap } from '../utils/StateStore.js'
/**
* @typedef {Object} HistorySnapshot
* @property {DeleteStore} HistorySnapshot.ds
* @property {Map<number,number>} HistorySnapshot.sm
*/
/**
* @param {encoding.Encoder} encoder
* @param {Y} y
*/
export const writeHistorySnapshot = (encoder, y) => {
writeDeleteStore(encoder, y.ds)
writeStateMap(encoder, y.ss.state)
}
/**
*
* @param {decoding.Decoder} decoder
* @return {HistorySnapshot}
*/
export const readHistorySnapshot = (decoder) => {
const ds = readFreshDeleteStore(decoder)
const sm = readStateMap(decoder)
return { ds, sm }
}

208
protocols/sync.js
View File

@ -10,9 +10,11 @@ import { deleteItemRange } from '../utils/structManipulation.js'
import { integrateRemoteStruct } from '../utils/integrateRemoteStructs.js' import { integrateRemoteStruct } from '../utils/integrateRemoteStructs.js'
import { Y } from '../utils/Y.js' // eslint-disable-line import { Y } from '../utils/Y.js' // eslint-disable-line
import * as stringify from '../utils/structStringify.js' import * as stringify from '../utils/structStringify.js'
import { readStateMap, writeStateMap } from '../utils/StateStore.js'
import { writeDeleteStore, readDeleteStore, stringifyDeleteStore } from '../utils/DeleteStore.js'
/** /**
* @typedef {Map<number, number>} StateSet * @typedef {Map<number, number>} StateMap
*/ */
/** /**
@ -44,196 +46,6 @@ export const messageYjsSyncStep1 = 0
export const messageYjsSyncStep2 = 1 export const messageYjsSyncStep2 = 1
export const messageYjsUpdate = 2 export const messageYjsUpdate = 2
/**
* Stringifies a message-encoded Delete Set.
*
* @param {decoding.Decoder} decoder
* @return {string}
*/
export const stringifyDeleteSet = (decoder) => {
let str = ''
const dsLength = decoding.readUint32(decoder)
for (let i = 0; i < dsLength; i++) {
str += ' -' + decoding.readVarUint(decoder) + ':\n' // decodes user
const dvLength = decoding.readUint32(decoder)
for (let j = 0; j < dvLength; j++) {
str += `clock: ${decoding.readVarUint(decoder)}, length: ${decoding.readVarUint(decoder)}, gc: ${decoding.readUint8(decoder) === 1}\n`
}
}
return str
}
/**
* Write the DeleteSet of a shared document to an Encoder.
*
* @param {encoding.Encoder} encoder
* @param {Y} y
*/
export const writeDeleteSet = (encoder, y) => {
let currentUser = null
let currentLength
let lastLenPos
let numberOfUsers = 0
const laterDSLenPus = encoding.length(encoder)
encoding.writeUint32(encoder, 0)
y.ds.iterate(null, null, n => {
const user = n._id.user
const clock = n._id.clock
const len = n.len
const gc = n.gc
if (currentUser !== user) {
numberOfUsers++
// a new user was foundimport { StateSet } from '../Store/StateStore.js' // eslint-disable-line
if (currentUser !== null) { // happens on first iteration
encoding.setUint32(encoder, lastLenPos, currentLength)
}
currentUser = user
encoding.writeVarUint(encoder, user)
// pseudo-fill pos
lastLenPos = encoding.length(encoder)
encoding.writeUint32(encoder, 0)
currentLength = 0
}
encoding.writeVarUint(encoder, clock)
encoding.writeVarUint(encoder, len)
encoding.writeUint8(encoder, gc ? 1 : 0)
currentLength++
})
if (currentUser !== null) { // happens on first iteration
encoding.setUint32(encoder, lastLenPos, currentLength)
}
encoding.setUint32(encoder, laterDSLenPus, numberOfUsers)
}
/**
* Read delete set from Decoder and apply it to a shared document.
*
* @param {decoding.Decoder} decoder
* @param {Y} y
*/
export const readDeleteSet = (decoder, y) => {
const dsLength = decoding.readUint32(decoder)
for (let i = 0; i < dsLength; i++) {
const user = decoding.readVarUint(decoder)
const dv = []
const dvLength = decoding.readUint32(decoder)
for (let j = 0; j < dvLength; j++) {
const from = decoding.readVarUint(decoder)
const len = decoding.readVarUint(decoder)
const gc = decoding.readUint8(decoder) === 1
dv.push({from, len, gc})
}
if (dvLength > 0) {
const deletions = []
let pos = 0
let d = dv[pos]
y.ds.iterate(ID.createID(user, 0), ID.createID(user, Number.MAX_VALUE), n => {
// cases:
// 1. d deletes something to the right of n
// => go to next n (break)
// 2. d deletes something to the left of n
// => create deletions
// => reset d accordingly
// *)=> if d doesn't delete anything anymore, go to next d (continue)
// 3. not 2) and d deletes something that also n deletes
// => reset d so that it doesn't contain n's deletion
// *)=> if d does not delete anything anymore, go to next d (continue)
while (d != null) {
var diff = 0 // describe the diff of length in 1) and 2)
if (n._id.clock + n.len <= d.from) {
// 1)
break
} else if (d.from < n._id.clock) {
// 2)
// delete maximum the len of d
// else delete as much as possible
diff = Math.min(n._id.clock - d.from, d.len)
// deleteItemRange(y, user, d.from, diff, true)
deletions.push([user, d.from, diff])
} else {
// 3)
diff = n._id.clock + n.len - d.from // never null (see 1)
if (d.gc && !n.gc) {
// d marks as gc'd but n does not
// then delete either way
// deleteItemRange(y, user, d.from, Math.min(diff, d.len), true)
deletions.push([user, d.from, Math.min(diff, d.len)])
}
}
if (d.len <= diff) {
// d doesn't delete anything anymore
d = dv[++pos]
} else {
d.from = d.from + diff // reset pos
d.len = d.len - diff // reset length
}
}
})
// TODO: It would be more performant to apply the deletes in the above loop
// Adapt the Tree implementation to support delete while iterating
for (let i = deletions.length - 1; i >= 0; i--) {
const del = deletions[i]
deleteItemRange(y, del[0], del[1], del[2], true)
}
// for the rest.. just apply it
for (; pos < dv.length; pos++) {
d = dv[pos]
deleteItemRange(y, user, d.from, d.len, true)
// deletions.push([user, d.from, d.len, d.gc)
}
}
}
}
/**
* Read a StateSet from Decoder and return it as string.
*
* @param {decoding.Decoder} decoder
* @return {string}
*/
export const stringifyStateSet = decoder => {
let s = 'State Set: '
readStateSet(decoder).forEach((clock, user) => {
s += `(${user}: ${clock}), `
})
return s
}
/**
* Write StateSet to Encoder
*
* @param {encoding.Encoder} encoder
* @param {Y} y
*/
export const writeStateSet = (encoder, y) => {
const state = y.ss.state
// write as fixed-size number to stay consistent with the other encode functions.
// => anytime we write the number of objects that follow, encode as fixed-size number.
encoding.writeUint32(encoder, state.size)
state.forEach((clock, user) => {
encoding.writeVarUint(encoder, user)
encoding.writeVarUint(encoder, clock)
})
}
/**
* Read StateSet from Decoder and return as Map
*
* @param {decoding.Decoder} decoder
* @return {StateSet}
*/
export const readStateSet = decoder => {
const ss = new Map()
const ssLength = decoding.readUint32(decoder)
for (let i = 0; i < ssLength; i++) {
const user = decoding.readVarUint(decoder)
const clock = decoding.readVarUint(decoder)
ss.set(user, clock)
}
return ss
}
/** /**
* @param {decoding.Decoder} decoder * @param {decoding.Decoder} decoder
* @param {Y} y * @param {Y} y
@ -262,7 +74,7 @@ export const stringifyStructs = (decoder, y) => {
* *
* @param {encoding.Encoder} encoder * @param {encoding.Encoder} encoder
* @param {Y} y * @param {Y} y
* @param {StateSet} ss State Set received from a remote client. Maps from client id to number of created operations by client id. * @param {StateMap} ss State Set received from a remote client. Maps from client id to number of created operations by client id.
*/ */
export const writeStructs = (encoder, y, ss) => { export const writeStructs = (encoder, y, ss) => {
const lenPos = encoding.length(encoder) const lenPos = encoding.length(encoder)
@ -328,7 +140,7 @@ export const stringifySyncStep1 = (decoder) => {
*/ */
export const writeSyncStep1 = (encoder, y) => { export const writeSyncStep1 = (encoder, y) => {
encoding.writeVarUint(encoder, messageYjsSyncStep1) encoding.writeVarUint(encoder, messageYjsSyncStep1)
writeStateSet(encoder, y) writeStateMap(encoder, y.ss.state)
} }
/** /**
@ -339,7 +151,7 @@ export const writeSyncStep1 = (encoder, y) => {
export const writeSyncStep2 = (encoder, y, ss) => { export const writeSyncStep2 = (encoder, y, ss) => {
encoding.writeVarUint(encoder, messageYjsSyncStep2) encoding.writeVarUint(encoder, messageYjsSyncStep2)
writeStructs(encoder, y, ss) writeStructs(encoder, y, ss)
writeDeleteSet(encoder, y) writeDeleteStore(encoder, y.ds)
} }
/** /**
@ -350,7 +162,7 @@ export const writeSyncStep2 = (encoder, y, ss) => {
* @param {Y} y * @param {Y} y
*/ */
export const readSyncStep1 = (decoder, encoder, y) => export const readSyncStep1 = (decoder, encoder, y) =>
writeSyncStep2(encoder, y, readStateSet(decoder)) writeSyncStep2(encoder, y, readStateMap(decoder))
/** /**
* @param {decoding.Decoder} decoder * @param {decoding.Decoder} decoder
@ -363,19 +175,19 @@ export const stringifySyncStep2 = (decoder, y) => {
str += stringifyStructs(decoder, y) str += stringifyStructs(decoder, y)
// write DS to string // write DS to string
str += ' + Delete Set:\n' str += ' + Delete Set:\n'
str += stringifyDeleteSet(decoder) str += stringifyDeleteStore(decoder)
return str return str
} }
/** /**
* Read and apply Structs and then DeleteSet to a y instance. * Read and apply Structs and then DeleteStore to a y instance.
* *
* @param {decoding.Decoder} decoder * @param {decoding.Decoder} decoder
* @param {Y} y * @param {Y} y
*/ */
export const readSyncStep2 = (decoder, y) => { export const readSyncStep2 = (decoder, y) => {
readStructs(decoder, y) readStructs(decoder, y)
readDeleteSet(decoder, y) readDeleteStore(decoder, y)
} }
/** /**

48
structs/ItemBinary.js Normal file
View File

@ -0,0 +1,48 @@
/**
* @module structs
*/
// TODO: ItemBinary should be able to merge with right (similar to other items). Or the other items (ItemJSON) should not be able to merge - extra byte + consistency
import { Item, splitHelper } from './Item.js'
import * as stringify from '../utils/structStringify.js'
import * as encoding from '../lib/encoding.js'
import * as decoding from '../lib/decoding.js'
import { Y } from '../utils/Y.js' // eslint-disable-line
export class ItemBinary extends Item {
constructor () {
super()
this._content = null
}
_copy () {
let struct = super._copy()
struct._content = this._content
return struct
}
/**
* @param {Y} y
* @param {decoding.Decoder} decoder
*/
_fromBinary (y, decoder) {
const missing = super._fromBinary(y, decoder)
this._content = decoding.readPayload(decoder)
return missing
}
/**
* @param {encoding.Encoder} encoder
*/
_toBinary (encoder) {
super._toBinary(encoder)
encoding.writePayload(encoder, this._content)
}
/**
* Transform this YXml Type to a readable format.
* Useful for logging as all Items and Delete implement this method.
*
* @private
*/
_logString () {
return stringify.logItemHelper('ItemBinary', this)
}
}

51
types/YArray.js
View File

@ -9,6 +9,8 @@ import * as stringify from '../utils/structStringify.js'
import { YEvent } from '../utils/YEvent.js' import { YEvent } from '../utils/YEvent.js'
import { Transaction } from '../utils/Transaction.js' // eslint-disable-line import { Transaction } from '../utils/Transaction.js' // eslint-disable-line
import { Item } from '../structs/Item.js' // eslint-disable-line import { Item } from '../structs/Item.js' // eslint-disable-line
import { ItemBinary } from '../structs/ItemBinary.js'
import { isVisible } from '../utils/snapshot.js'
/** /**
* Event that describes the changes on a YArray * Event that describes the changes on a YArray
@ -89,6 +91,7 @@ export class YArray extends Type {
* Returns the i-th element from a YArray. * Returns the i-th element from a YArray.
* *
* @param {number} index The index of the element to return from the YArray * @param {number} index The index of the element to return from the YArray
* @return {any}
*/ */
get (index) { get (index) {
let n = this._start let n = this._start
@ -112,10 +115,11 @@ export class YArray extends Type {
/** /**
* Transforms this YArray to a JavaScript Array. * Transforms this YArray to a JavaScript Array.
* *
* @param {Object} [snapshot]
* @return {Array} * @return {Array}
*/ */
toArray () { toArray (snapshot) {
return this.map(c => c) return this.map(c => c, snapshot)
} }
/** /**
@ -137,14 +141,15 @@ export class YArray extends Type {
* element of this YArray. * element of this YArray.
* *
* @param {Function} f Function that produces an element of the new Array * @param {Function} f Function that produces an element of the new Array
* @param {import('../protocols/history.js').HistorySnapshot} [snapshot]
* @return {Array} A new array with each element being the result of the * @return {Array} A new array with each element being the result of the
* callback function * callback function
*/ */
map (f) { map (f, snapshot) {
const res = [] const res = []
this.forEach((c, i) => { this.forEach((c, i) => {
res.push(f(c, i, this)) res.push(f(c, i, this))
}) }, snapshot)
return res return res
} }
@ -152,14 +157,17 @@ export class YArray extends Type {
* Executes a provided function on once on overy element of this YArray. * Executes a provided function on once on overy element of this YArray.
* *
* @param {Function} f A function to execute on every element of this YArray. * @param {Function} f A function to execute on every element of this YArray.
* @param {import('../protocols/history.js').HistorySnapshot} [snapshot]
*/ */
forEach (f) { forEach (f, snapshot) {
let index = 0 let index = 0
let n = this._start let n = this._start
while (n !== null) { while (n !== null) {
if (!n._deleted && n._countable) { if (isVisible(n, snapshot) && n._countable) {
if (n instanceof Type) { if (n instanceof Type) {
f(n, index++, this) f(n, index++, this)
} else if (n.constructor === ItemBinary) {
f(n._content, index++, this)
} else { } else {
const content = n._content const content = n._content
const contentLen = content.length const contentLen = content.length
@ -239,7 +247,7 @@ export class YArray extends Type {
* *
* @private * @private
* @param {Item} left The element container to use as a reference. * @param {Item} left The element container to use as a reference.
* @param {Array} content The Array of content to insert (see {@see insert}) * @param {Array<number|string|Object|ArrayBuffer>} content The Array of content to insert (see {@see insert})
*/ */
insertAfter (left, content) { insertAfter (left, content) {
this._transact(y => { this._transact(y => {
@ -276,6 +284,29 @@ export class YArray extends Type {
left._right = c left._right = c
} }
left = c left = c
} else if (c.constructor === ArrayBuffer) {
if (prevJsonIns !== null) {
if (y !== null) {
prevJsonIns._integrate(y)
}
left = prevJsonIns
prevJsonIns = null
}
const itemBinary = new ItemBinary()
itemBinary._origin = left
itemBinary._left = left
itemBinary._right = right
itemBinary._right_origin = right
itemBinary._parent = this
itemBinary._content = c
if (y !== null) {
itemBinary._integrate(y)
} else if (left === null) {
this._start = itemBinary
} else {
left._right = itemBinary
}
left = itemBinary
} else { } else {
if (prevJsonIns === null) { if (prevJsonIns === null) {
prevJsonIns = new ItemJSON() prevJsonIns = new ItemJSON()
@ -294,6 +325,8 @@ export class YArray extends Type {
prevJsonIns._integrate(y) prevJsonIns._integrate(y)
} else if (prevJsonIns._left === null) { } else if (prevJsonIns._left === null) {
this._start = prevJsonIns this._start = prevJsonIns
} else {
left._right = prevJsonIns
} }
} }
}) })
@ -314,7 +347,7 @@ export class YArray extends Type {
* yarray.insert(2, [1, 2]) * yarray.insert(2, [1, 2])
* *
* @param {number} index The index to insert content at. * @param {number} index The index to insert content at.
* @param {Array} content The array of content * @param {Array<number|string|ArrayBuffer|Type>} content The array of content
*/ */
insert (index, content) { insert (index, content) {
this._transact(() => { this._transact(() => {
@ -347,7 +380,7 @@ export class YArray extends Type {
/** /**
* Appends content to this YArray. * Appends content to this YArray.
* *
* @param {Array} content Array of content to append. * @param {Array<number|string|ArrayBuffer|Type>} content Array of content to append.
*/ */
push (content) { push (content) {
let n = this._start let n = this._start

51
types/YMap.js
View File

@ -7,6 +7,8 @@ import { Type } from '../structs/Type.js'
import { ItemJSON } from '../structs/ItemJSON.js' import { ItemJSON } from '../structs/ItemJSON.js'
import * as stringify from '../utils/structStringify.js' import * as stringify from '../utils/structStringify.js'
import { YEvent } from '../utils/YEvent.js' import { YEvent } from '../utils/YEvent.js'
import { ItemBinary } from '../structs/ItemBinary.js'
import { isVisible } from '../utils/snapshot.js';
/** /**
* Event that describes the changes on a YMap. * Event that describes the changes on a YMap.
@ -53,6 +55,8 @@ export class YMap extends Type {
} else { } else {
res = item.toString() res = item.toString()
} }
} else if (item.constructor === ItemBinary) {
res = item._content
} else { } else {
res = item._content[0] res = item._content[0]
} }
@ -65,16 +69,25 @@ export class YMap extends Type {
/** /**
* Returns the keys for each element in the YMap Type. * Returns the keys for each element in the YMap Type.
* *
* @param {import('../protocols/history.js').HistorySnapshot} [snapshot]
* @return {Array} * @return {Array}
*/ */
keys () { keys (snapshot) {
// TODO: Should return either Iterator or Set! // TODO: Should return either Iterator or Set!
let keys = [] let keys = []
if (snapshot === undefined) {
for (let [key, value] of this._map) { for (let [key, value] of this._map) {
if (!value._deleted) { if (value._deleted) {
keys.push(key) keys.push(key)
} }
} }
} else {
for (let key in this._map) {
if (this.has(key, snapshot)) {
keys.push(key)
}
}
}
return keys return keys
} }
@ -96,7 +109,7 @@ export class YMap extends Type {
* Adds or updates an element with a specified key and value. * Adds or updates an element with a specified key and value.
* *
* @param {string} key The key of the element to add to this YMap * @param {string} key The key of the element to add to this YMap
* @param {Object | string | number | Type} value The value of the element to add * @param {Object | string | number | Type | ArrayBuffer } value The value of the element to add
*/ */
set (key, value) { set (key, value) {
this._transact(y => { this._transact(y => {
@ -120,6 +133,9 @@ export class YMap extends Type {
value = v value = v
} else if (value instanceof Item) { } else if (value instanceof Item) {
v = value v = value
} else if (value.constructor === ArrayBuffer) {
v = new ItemBinary()
v._content = value
} else { } else {
v = new ItemJSON() v = new ItemJSON()
v._content = [value] v._content = [value]
@ -141,31 +157,48 @@ export class YMap extends Type {
* Returns a specified element from this YMap. * Returns a specified element from this YMap.
* *
* @param {string} key The key of the element to return. * @param {string} key The key of the element to return.
* @param {import('../protocols/history.js').HistorySnapshot} [snapshot]
*/ */
get (key) { get (key, snapshot) {
let v = this._map.get(key) let v = this._map.get(key)
if (v === undefined || v._deleted) { if (v === undefined) {
return undefined return undefined
} }
if (snapshot !== undefined) {
// iterate until found element that exists
while (!snapshot.sm.has(v._id.user) || v._id.clock >= snapshot.sm.get(v._id.user)) {
v = v._right
}
}
if (isVisible(v, snapshot)) {
if (v instanceof Type) { if (v instanceof Type) {
return v return v
} else if (v.constructor === ItemBinary) {
return v._content
} else { } else {
return v._content[v._content.length - 1] return v._content[v._content.length - 1]
} }
} }
}
/** /**
* Returns a boolean indicating whether the specified key exists or not. * Returns a boolean indicating whether the specified key exists or not.
* *
* @param {string} key The key to test. * @param {string} key The key to test.
* @param {import('../protocols/history.js').HistorySnapshot} [snapshot]
*/ */
has (key) { has (key, snapshot) {
let v = this._map.get(key) let v = this._map.get(key)
if (v === undefined || v._deleted) { if (v === undefined) {
return false return false
} else {
return true
} }
if (snapshot !== undefined) {
// iterate until found element that exists
while (!snapshot.sm.has(v._id.user) || v._id.clock >= snapshot.sm.get(v._id.user)) {
v = v._right
}
}
return isVisible(v, snapshot)
} }
/** /**

6
types/YText.js
View File

@ -7,6 +7,7 @@ import { ItemString } from '../structs/ItemString.js'
import { ItemFormat } from '../structs/ItemFormat.js' import { ItemFormat } from '../structs/ItemFormat.js'
import * as stringify from '../utils/structStringify.js' import * as stringify from '../utils/structStringify.js'
import { YArrayEvent, YArray } from './YArray.js' import { YArrayEvent, YArray } from './YArray.js'
import { isVisible } from '../utils/snapshot.js'
/** /**
* @private * @private
@ -570,11 +571,12 @@ export class YText extends YArray {
/** /**
* Returns the Delta representation of this YText type. * Returns the Delta representation of this YText type.
* *
* @param {import('../protocols/history.js').HistorySnapshot} [snapshot]
* @return {Delta} The Delta representation of this type. * @return {Delta} The Delta representation of this type.
* *
* @public * @public
*/ */
toDelta () { toDelta (snapshot) {
let ops = [] let ops = []
let currentAttributes = new Map() let currentAttributes = new Map()
let str = '' let str = ''
@ -600,7 +602,7 @@ export class YText extends YArray {
} }
} }
while (n !== null) { while (n !== null) {
if (!n._deleted) { if (isVisible(n, snapshot)) {
switch (n.constructor) { switch (n.constructor) {
case ItemString: case ItemString:
str += n._content str += n._content

14
types/YXmlElement.js
View File

@ -300,28 +300,36 @@ export class YXmlElement extends YXmlFragment {
* *
* @param {String} attributeName The attribute name that identifies the * @param {String} attributeName The attribute name that identifies the
* queried value. * queried value.
* @param {import('../protocols/history.js').HistorySnapshot} [snapshot]
* @return {String} The queried attribute value. * @return {String} The queried attribute value.
* *
* @public * @public
*/ */
getAttribute (attributeName) { getAttribute (attributeName, snapshot) {
return YMap.prototype.get.call(this, attributeName) return YMap.prototype.get.call(this, attributeName, snapshot)
} }
/** /**
* Returns all attribute name/value pairs in a JSON Object. * Returns all attribute name/value pairs in a JSON Object.
* *
* @param {import('../protocols/history.js').HistorySnapshot} [snapshot]
* @return {Object} A JSON Object that describes the attributes. * @return {Object} A JSON Object that describes the attributes.
* *
* @public * @public
*/ */
getAttributes () { getAttributes (snapshot) {
const obj = {} const obj = {}
if (snapshot === undefined) {
for (let [key, value] of this._map) { for (let [key, value] of this._map) {
if (!value._deleted) { if (!value._deleted) {
obj[key] = value._content[0] obj[key] = value._content[0]
} }
} }
} else {
for (let key in this._map) {
return YMap.prototype.get.call(this, key, snapshot)
}
}
return obj return obj
} }
// TODO: outsource the binding property. // TODO: outsource the binding property.

170
utils/DeleteStore.js
View File

@ -5,6 +5,10 @@
import { Tree } from '../lib/Tree.js' import { Tree } from '../lib/Tree.js'
import * as ID from './ID.js' import * as ID from './ID.js'
import * as encoding from '../lib/encoding.js'
import * as decoding from '../lib/decoding.js'
import { deleteItemRange } from '../utils/structManipulation.js'
class DSNode { class DSNode {
constructor (id, len, gc) { constructor (id, len, gc) {
this._id = id this._id = id
@ -86,8 +90,168 @@ export class DeleteStore extends Tree {
this.put(newMark) this.put(newMark)
} }
} }
// TODO: exchange markDeleted for mark() }
markDeleted (id, length) {
this.mark(id, length, false)
/**
* Stringifies a message-encoded Delete Set.
*
* @param {decoding.Decoder} decoder
* @return {string}
*/
export const stringifyDeleteStore = (decoder) => {
let str = ''
const dsLength = decoding.readUint32(decoder)
for (let i = 0; i < dsLength; i++) {
str += ' -' + decoding.readVarUint(decoder) + ':\n' // decodes user
const dvLength = decoding.readUint32(decoder)
for (let j = 0; j < dvLength; j++) {
str += `clock: ${decoding.readVarUint(decoder)}, length: ${decoding.readVarUint(decoder)}, gc: ${decoding.readUint8(decoder) === 1}\n`
}
}
return str
}
/**
* Write the DeleteSet of a shared document to an Encoder.
*
* @param {encoding.Encoder} encoder
* @param {DeleteStore} ds
*/
export const writeDeleteStore = (encoder, ds) => {
let currentUser = null
let currentLength
let lastLenPos
let numberOfUsers = 0
const laterDSLenPus = encoding.length(encoder)
encoding.writeUint32(encoder, 0)
ds.iterate(null, null, n => {
const user = n._id.user
const clock = n._id.clock
const len = n.len
const gc = n.gc
if (currentUser !== user) {
numberOfUsers++
// a new user was found
if (currentUser !== null) { // happens on first iteration
encoding.setUint32(encoder, lastLenPos, currentLength)
}
currentUser = user
encoding.writeVarUint(encoder, user)
// pseudo-fill pos
lastLenPos = encoding.length(encoder)
encoding.writeUint32(encoder, 0)
currentLength = 0
}
encoding.writeVarUint(encoder, clock)
encoding.writeVarUint(encoder, len)
encoding.writeUint8(encoder, gc ? 1 : 0)
currentLength++
})
if (currentUser !== null) { // happens on first iteration
encoding.setUint32(encoder, lastLenPos, currentLength)
}
encoding.setUint32(encoder, laterDSLenPus, numberOfUsers)
}
/**
* Read delete store from Decoder and create a fresh DeleteStore
*
* @param {decoding.Decoder} decoder
* @return {DeleteStore}
*/
export const readFreshDeleteStore = decoder => {
const ds = new DeleteStore()
const dsLength = decoding.readUint32(decoder)
for (let i = 0; i < dsLength; i++) {
const user = decoding.readVarUint(decoder)
const dvLength = decoding.readUint32(decoder)
for (let j = 0; j < dvLength; j++) {
const from = decoding.readVarUint(decoder)
const len = decoding.readVarUint(decoder)
const gc = decoding.readUint8(decoder)
ds.put(new DSNode(ID.createID(user, from), len, gc))
}
}
return ds
}
/**
* Read delete set from Decoder and apply it to a shared document.
*
* @param {decoding.Decoder} decoder
* @param {Y} y
*/
export const readDeleteStore = (decoder, y) => {
const dsLength = decoding.readUint32(decoder)
for (let i = 0; i < dsLength; i++) {
const user = decoding.readVarUint(decoder)
const dv = []
const dvLength = decoding.readUint32(decoder)
for (let j = 0; j < dvLength; j++) {
const from = decoding.readVarUint(decoder)
const len = decoding.readVarUint(decoder)
const gc = decoding.readUint8(decoder) === 1
dv.push({from, len, gc})
}
if (dvLength > 0) {
const deletions = []
let pos = 0
let d = dv[pos]
y.ds.iterate(ID.createID(user, 0), ID.createID(user, Number.MAX_VALUE), n => {
// cases:
// 1. d deletes something to the right of n
// => go to next n (break)
// 2. d deletes something to the left of n
// => create deletions
// => reset d accordingly
// *)=> if d doesn't delete anything anymore, go to next d (continue)
// 3. not 2) and d deletes something that also n deletes
// => reset d so that it doesn't contain n's deletion
// *)=> if d does not delete anything anymore, go to next d (continue)
while (d != null) {
var diff = 0 // describe the diff of length in 1) and 2)
if (n._id.clock + n.len <= d.from) {
// 1)
break
} else if (d.from < n._id.clock) {
// 2)
// delete maximum the len of d
// else delete as much as possible
diff = Math.min(n._id.clock - d.from, d.len)
// deleteItemRange(y, user, d.from, diff, true)
deletions.push([user, d.from, diff])
} else {
// 3)
diff = n._id.clock + n.len - d.from // never null (see 1)
if (d.gc && !n.gc) {
// d marks as gc'd but n does not
// then delete either way
// deleteItemRange(y, user, d.from, Math.min(diff, d.len), true)
deletions.push([user, d.from, Math.min(diff, d.len)])
}
}
if (d.len <= diff) {
// d doesn't delete anything anymore
d = dv[++pos]
} else {
d.from = d.from + diff // reset pos
d.len = d.len - diff // reset length
}
}
})
// TODO: It would be more performant to apply the deletes in the above loop
// Adapt the Tree implementation to support delete while iterating
for (let i = deletions.length - 1; i >= 0; i--) {
const del = deletions[i]
deleteItemRange(y, del[0], del[1], del[2], true)
}
// for the rest.. just apply it
for (; pos < dv.length; pos++) {
d = dv[pos]
deleteItemRange(y, user, d.from, d.len, true)
// deletions.push([user, d.from, d.len, d.gc)
}
}
} }
} }

57
utils/StateStore.js
View File

@ -4,12 +4,65 @@
import * as ID from '../utils/ID.js' import * as ID from '../utils/ID.js'
import * as encoding from '../lib/encoding.js'
import * as decoding from '../lib/decoding.js'
const writeStateStore = (encoder, ss) => {
}
/** /**
* @typedef {Map<number, number>} StateSet * @typedef {Map<number, number>} StateMap
*/ */
/** /**
* @private * Read StateMap from Decoder and return as Map
*
* @param {decoding.Decoder} decoder
* @return {StateMap}
*/
export const readStateMap = decoder => {
const ss = new Map()
const ssLength = decoding.readUint32(decoder)
for (let i = 0; i < ssLength; i++) {
const user = decoding.readVarUint(decoder)
const clock = decoding.readVarUint(decoder)
ss.set(user, clock)
}
return ss
}
/**
* Write StateMap to Encoder
*
* @param {encoding.Encoder} encoder
* @param {StateMap} state
*/
export const writeStateMap = (encoder, state) => {
// write as fixed-size number to stay consistent with the other encode functions.
// => anytime we write the number of objects that follow, encode as fixed-size number.
encoding.writeUint32(encoder, state.size)
state.forEach((clock, user) => {
encoding.writeVarUint(encoder, user)
encoding.writeVarUint(encoder, clock)
})
}
/**
* Read a StateMap from Decoder and return it as string.
*
* @param {decoding.Decoder} decoder
* @return {string}
*/
export const stringifyStateMap = decoder => {
let s = 'State Set: '
readStateMap(decoder).forEach((clock, user) => {
s += `(${user}: ${clock}), `
})
return s
}
/**
*/ */
export class StateStore { export class StateStore {
constructor (y) { constructor (y) {

9
utils/Y.js
View File

@ -1,4 +1,4 @@
import { DeleteStore } from './DeleteStore.js' import { DeleteStore, readDeleteStore, writeDeleteStore } from './DeleteStore.js'
import { OperationStore } from './OperationStore.js' import { OperationStore } from './OperationStore.js'
import { StateStore } from './StateStore.js' import { StateStore } from './StateStore.js'
import { generateRandomUint32 } from './generateRandomUint32.js' import { generateRandomUint32 } from './generateRandomUint32.js'
@ -59,7 +59,7 @@ export class Y extends NamedEventHandler {
importModel (decoder) { importModel (decoder) {
this.transact(() => { this.transact(() => {
integrateRemoteStructs(decoder, this) integrateRemoteStructs(decoder, this)
message.readDeleteSet(decoder, this) readDeleteStore(decoder, this)
}) })
} }
@ -71,7 +71,7 @@ export class Y extends NamedEventHandler {
exportModel () { exportModel () {
const encoder = encoding.createEncoder() const encoder = encoding.createEncoder()
message.writeStructs(encoder, this, new Map()) message.writeStructs(encoder, this, new Map())
message.writeDeleteSet(encoder, this) writeDeleteStore(encoder, this.ds)
return encoding.toBuffer(encoder) return encoding.toBuffer(encoder)
} }
_beforeChange () {} _beforeChange () {}
@ -174,7 +174,7 @@ export class Y extends NamedEventHandler {
* *
* @param {String} name * @param {String} name
* @param {Function} TypeConstructor The constructor of the type definition * @param {Function} TypeConstructor The constructor of the type definition
* @returns {Type} The created type. Constructed with TypeConstructor * @returns {any} The created type. Constructed with TypeConstructor
*/ */
define (name, TypeConstructor) { define (name, TypeConstructor) {
let id = createRootID(name, TypeConstructor) let id = createRootID(name, TypeConstructor)
@ -194,6 +194,7 @@ export class Y extends NamedEventHandler {
* This returns the same value as `y.share[name]` * This returns the same value as `y.share[name]`
* *
* @param {String} name The typename * @param {String} name The typename
* @return {any}
*/ */
get (name) { get (name) {
return this._map.get(name) return this._map.get(name)

8
utils/snapshot.js Normal file
View File

@ -0,0 +1,8 @@
/**
*
* @param {Item} item
* @param {import("../protocols/history").HistorySnapshot} [snapshot]
*/
export const isVisible = (item, snapshot) => snapshot === undefined ? !item._deleted : (snapshot.sm.has(item._id.user) && snapshot.sm.get(item._id.user) > item._id.clock && !snapshot.ds.isDeleted(item._id))