diff --git a/common/lsp.go b/common/lsp.go
new file mode 100644
index 0000000..eede1be
--- /dev/null
+++ b/common/lsp.go
@@ -0,0 +1,5 @@
+package common
+
+func CursorToCharacterIndex(cursor uint32) uint32 {
+	return max(0, cursor-1)
+}