From ca7edbcc6b201df7b5070cde205e66f576948475 Mon Sep 17 00:00:00 2001
From: Josh Kingsley <josh@joshkingsley.me>
Date: Sun, 26 Oct 2025 21:04:24 +0200
Subject: feat(web): add subdivideSelection method

---
 web/src/types.ts | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

(limited to 'web/src/types.ts')

diff --git a/web/src/types.ts b/web/src/types.ts
index d932389..8b1b650 100644
--- a/web/src/types.ts
+++ b/web/src/types.ts
@@ -44,3 +44,43 @@ export function cellRefEquals(a: CellRef, b: CellRef): boolean {
     a.cellIndex === b.cellIndex
   );
 }
+
+export function mapRowsInRange(
+  doc: Doc,
+  gridId: string,
+  startRef: CellRef,
+  endRef: CellRef,
+  mapFn: (row: Row, ref: RowRef) => Row,
+): Doc {
+  const firstPartIndex = Math.min(startRef.partIndex, endRef.partIndex);
+  const lastPartIndex = Math.max(startRef.partIndex, endRef.partIndex);
+  const firstRowIndex = Math.min(startRef.rowIndex, endRef.rowIndex);
+  const lastRowIndex = Math.max(startRef.rowIndex, endRef.rowIndex);
+
+  return {
+    ...doc,
+    grids: doc.grids.map((grid) => {
+      if (grid.id !== gridId) return grid;
+
+      return {
+        ...grid,
+        parts: grid.parts.map((part, partIndex) => {
+          if (partIndex < firstPartIndex || partIndex > lastPartIndex) {
+            return part;
+          }
+
+          return {
+            ...part,
+            rows: part.rows.map((row, rowIndex) => {
+              if (rowIndex < firstRowIndex || rowIndex > lastRowIndex) {
+                return row;
+              }
+
+              return mapFn(row, { partIndex, rowIndex });
+            }),
+          };
+        }),
+      };
+    }),
+  };
+}
-- 
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