implement snapshot & event.changes

src/utils/encoding.js

@@ -23,7 +23,7 @@ import {
   readID,
   getState,
   getStateVector,
-  readDeleteSet,
+  readAndApplyDeleteSet,
   writeDeleteSet,
   createDeleteSetFromStructStore,
   Doc, Transaction, AbstractStruct, StructStore, ID // eslint-disable-line
@@ -230,7 +230,7 @@ export const tryResumePendingDeleteReaders = (transaction, store) => {
   const pendingReaders = store.pendingDeleteReaders
   store.pendingDeleteReaders = []
   for (let i = 0; i < pendingReaders.length; i++) {
-    readDeleteSet(pendingReaders[i], transaction, store)
+    readAndApplyDeleteSet(pendingReaders[i], transaction, store)
   }
 }
 
@@ -301,7 +301,7 @@ export const readStructs = (decoder, transaction, store) => {
 export const readUpdate = (decoder, ydoc, transactionOrigin) =>
   ydoc.transact(transaction => {
     readStructs(decoder, transaction, ydoc.store)
-    readDeleteSet(decoder, transaction, ydoc.store)
+    readAndApplyDeleteSet(decoder, transaction, ydoc.store)
   }, transactionOrigin)
 
 /**
@@ -381,6 +381,22 @@ export const readStateVector = decoder => {
  */
 export const decodeStateVector = decodedState => readStateVector(decoding.createDecoder(decodedState))
 
+/**
+ * Write State Vector to `lib0/encoding.js#Encoder`.
+ *
+ * @param {encoding.Encoder} encoder
+ * @param {Map<number,number>} sv
+ * @function
+ */
+export const writeStateVector = (encoder, sv) => {
+  encoding.writeVarUint(encoder, sv.size)
+  sv.forEach((clock, client) => {
+    encoding.writeVarUint(encoder, client)
+    encoding.writeVarUint(encoder, clock)
+  })
+  return encoder
+}
+
 /**
  * Write State Vector to `lib0/encoding.js#Encoder`.
  *
@@ -389,16 +405,7 @@ export const decodeStateVector = decodedState => readStateVector(decoding.create
  *
  * @function
  */
-export const writeDocumentStateVector = (encoder, doc) => {
-  encoding.writeVarUint(encoder, doc.store.clients.size)
-  doc.store.clients.forEach((structs, client) => {
-    const struct = structs[structs.length - 1]
-    const id = struct.id
-    encoding.writeVarUint(encoder, id.client)
-    encoding.writeVarUint(encoder, id.clock + struct.length)
-  })
-  return encoder
-}
+export const writeDocumentStateVector = (encoder, doc) => writeStateVector(encoder, getStateVector(doc.store))
 
 /**
  * Encode State as Uint8Array.