array.insert throws length-exceeded event - fixes #314

src/types/AbstractType.js

@@ -679,6 +679,8 @@ export const typeListInsertGenericsAfter = (transaction, parent, referenceItem,
   packJsonContent()
 }
 
+const lengthExceeded = error.create('Length exceeded!')
+
 /**
  * @param {Transaction} transaction
  * @param {AbstractType<any>} parent
@@ -689,6 +691,9 @@ export const typeListInsertGenericsAfter = (transaction, parent, referenceItem,
  * @function
  */
 export const typeListInsertGenerics = (transaction, parent, index, content) => {
+  if (index > parent._length) {
+    throw lengthExceeded
+  }
   if (index === 0) {
     if (parent._searchMarker) {
       updateMarkerChanges(parent._searchMarker, index, content.length)
@@ -766,7 +771,7 @@ export const typeListDelete = (transaction, parent, index, length) => {
     n = n.right
   }
   if (length > 0) {
-    throw error.create('array length exceeded')
+    throw lengthExceeded
   }
   if (parent._searchMarker) {
     updateMarkerChanges(parent._searchMarker, startIndex, -startLength + length /* in case we remove the above exception */)

tests/y-array.tests.js

@@ -61,6 +61,49 @@ export const testLengthIssue = tc => {
   t.assert(arr.length === arr.toArray().length)
 }
 
+/**
+ * Debugging yjs#314
+ *
+ * @param {t.TestCase} tc
+ */
+export const testLengthIssue2 = tc => {
+  const doc = new Y.Doc()
+  const next = doc.getArray()
+  doc.transact(() => {
+    next.insert(0, ['group2'])
+  })
+  doc.transact(() => {
+    next.insert(1, ['rectangle3'])
+  })
+  doc.transact(() => {
+    next.delete(0)
+    next.insert(0, ['rectangle3'])
+  })
+  next.delete(1)
+  doc.transact(() => {
+    next.insert(1, ['ellipse4'])
+  })
+  doc.transact(() => {
+    next.insert(2, ['ellipse3'])
+  })
+  doc.transact(() => {
+    next.insert(3, ['ellipse2'])
+  })
+  doc.transact(() => {
+    doc.transact(() => {
+      t.fails(() => {
+        next.insert(5, ['rectangle2'])
+      })
+      next.insert(4, ['rectangle2'])
+    })
+    doc.transact(() => {
+      // this should not throw an error message
+      next.delete(4)
+    })
+  })
+  console.log(next.toArray())
+}
+
 /**
  * @param {t.TestCase} tc
  */