feat: try to use inner annotations model to cursors

packages/bridge/src/cursor/index.ts

@@ -0,0 +1,88 @@
+import { toJS } from '../utils'
+
+import { Operation } from 'slate'
+import { List } from 'immutable'
+
+export const setCursor = (
+  doc,
+  { id, selection, selectionOps, annotationType }
+) => {
+  if (!doc.annotations) {
+    doc.annotations = {}
+  }
+
+  if (!doc.annotations[id]) {
+    doc.annotations[id] = {
+      key: id,
+      type: annotationType,
+      data: {}
+    }
+  }
+
+  const annotation = toJS(doc.annotations[id])
+
+  if (selectionOps.size) {
+    selectionOps.forEach(op => {
+      const { newProperties } = op.toJSON()
+
+      if (newProperties.focus) annotation.focus = newProperties.focus
+      if (newProperties.anchor) annotation.anchor = newProperties.anchor
+      if (newProperties.data) annotation.data = newProperties.data
+    })
+  }
+
+  const cursorStart = annotation.anchor && annotation.anchor.offset
+  const cursorEnd = annotation.focus && annotation.focus.offset
+
+  console.log('cursor!!', cursorStart, cursorEnd)
+  console.log(
+    'selection!!',
+    annotation,
+    selection.start.offset,
+    selection.end.offset
+  )
+
+  if (selection.start.offset !== cursorStart) {
+    annotation.focus = selection.end.toJS() || {}
+  }
+
+  if (selection.end.offset !== cursorEnd) {
+    annotation.anchor = selection.start.toJS() || {}
+  }
+
+  annotation.data.isBackward = selection.isBackward
+
+  console.log('setted cursor', annotation, toJS(doc))
+
+  doc.annotations[id] = annotation
+
+  return doc
+}
+
+export const removeCursor = (doc, { id }) => {
+  console.log('!!!removeCursor', doc, id)
+  if (doc.annotations && doc.annotations[id]) {
+    delete doc.annotations[id]
+  }
+
+  return doc
+}
+
+export const cursorOpFilter = (doc, ops: List<Operation>) =>
+  ops.filter(op => {
+    const { annotations } = doc
+
+    if (op.type === 'set_annotation') {
+      return !(
+        (op.properties && annotations[op.properties.key]) ||
+        (op.newProperties && annotations[op.newProperties.key])
+      )
+    } else if (
+      op.type === 'add_annotation' ||
+      op.type === 'remove_annotation'
+    ) {
+      return !annotations[op.annotation.key]
+    }
+
+    return true
+  })