1 files changed, 19 insertions, 1 deletions
diff --git a/src/new_fields/Doc.ts b/src/new_fields/Doc.ts
index 1b0ff812f..27b3473f8 100644
--- a/src/new_fields/Doc.ts
+++ b/src/new_fields/Doc.ts
@@ -166,6 +166,14 @@ export namespace Doc {
     export function IsPrototype(doc: Doc) {
         return GetT(doc, "isPrototype", "boolean", true);
     }
+    export async function SetInPlace(doc: Doc, key: string, value: Field | undefined, defaultProto: boolean) {
+        let hasProto = doc.proto instanceof Doc;
+        let onDeleg = Object.getOwnPropertyNames(doc).indexOf(key) !== -1;
+        let onProto = Object.getOwnPropertyNames(doc.proto).indexOf(key) !== -1;
+        if (onDeleg || !hasProto || (!onProto && !defaultProto))
+            doc[key] = value;
+        else doc.proto![key] = value;
+    }
     export async function SetOnPrototype(doc: Doc, key: string, value: Field) {
         const proto = Object.getOwnPropertyNames(doc).indexOf("isPrototype") === -1 ? doc.proto : doc;
 
@@ -207,7 +215,7 @@ export namespace Doc {
 
     // gets the document's prototype or returns the document if it is a prototype
     export function GetProto(doc: Doc) {
-        return Doc.GetT(doc, "isPrototype", "boolean", true) ? doc : doc.proto!;
+        return Doc.GetT(doc, "isPrototype", "boolean", true) ? doc : (doc.proto || doc);
     }
 
     export function allKeys(doc: Doc): string[] {
@@ -222,6 +230,16 @@ export namespace Doc {
         return Array.from(results);
     }
 
+    export function AddDocToList(target: Doc, key: string, doc: Doc, relativeTo?: Doc, before?: boolean) {
+        let list = Cast(target[key], listSpec(Doc));
+        if (list) {
+            let ind = relativeTo ? list.indexOf(relativeTo) : -1;
+            if (ind === -1) list.push(doc);
+            else list.splice(before ? ind : ind + 1, 0, doc);
+        }
+        return true;
+    }
+
     export function MakeAlias(doc: Doc) {
         if (!GetT(doc, "isPrototype", "boolean", true)) {
             return Doc.MakeCopy(doc);