Add serialization functions for ProjectDocument

src/serialization/scene-document-json.ts

@@ -1,6 +1,12 @@
-import type { SceneDocument } from "../document/scene-document";
-import { migrateSceneDocument } from "../document/migrate-scene-document";
-import { assertSceneDocumentIsValid } from "../document/scene-document-validation";
+import type { ProjectDocument, SceneDocument } from "../document/scene-document";
+import {
+  migrateProjectDocument,
+  migrateSceneDocument
+} from "../document/migrate-scene-document";
+import {
+  assertProjectDocumentIsValid,
+  assertSceneDocumentIsValid
+} from "../document/scene-document-validation";
 
 export function serializeSceneDocument(document: SceneDocument): string {
   assertSceneDocumentIsValid(document);
@@ -21,3 +27,24 @@ export function parseSceneDocumentJson(source: string): SceneDocument {
   assertSceneDocumentIsValid(document);
   return document;
 }
+
+export function serializeProjectDocument(document: ProjectDocument): string {
+  assertProjectDocumentIsValid(document);
+  return JSON.stringify(document, null, 2);
+}
+
+export function parseProjectDocumentJson(source: string): ProjectDocument {
+  let parsedValue: unknown;
+
+  try {
+    parsedValue = JSON.parse(source);
+  } catch (error) {
+    const cause =
+      error instanceof Error ? error.message : "Unknown JSON parse failure.";
+    throw new Error(`Project document JSON could not be parsed: ${cause}`);
+  }
+
+  const document = migrateProjectDocument(parsedValue);
+  assertProjectDocumentIsValid(document);
+  return document;
+}