lua: support getting UTF-32 and UTF-16 sizes of replaced text

1 files changed, 15 insertions, 2 deletions

diff --git a/src/nvim/buffer_defs.h b/src/nvim/buffer_defs.h
index eb26e4ad8e..b11eaefdd0 100644
--- a/src/nvim/buffer_defs.h
+++ b/src/nvim/buffer_defs.h
@@ -459,8 +459,9 @@ typedef struct {
   LuaRef on_lines;
   LuaRef on_changedtick;
   LuaRef on_detach;
+  bool utf_sizes;
 } BufUpdateCallbacks;
-#define BUF_UPDATE_CALLBACKS_INIT { LUA_NOREF, LUA_NOREF, LUA_NOREF }
+#define BUF_UPDATE_CALLBACKS_INIT { LUA_NOREF, LUA_NOREF, LUA_NOREF, false }
 
 #define BUF_HAS_QF_ENTRY 1
 #define BUF_HAS_LL_ENTRY 2
@@ -802,12 +803,24 @@ struct file_buffer {
 
   kvec_t(BufhlLine *) b_bufhl_move_space;  // temporary space for highlights
 
-  // array of channelids which have asked to receive updates for this
+  // array of channel_id:s which have asked to receive updates for this
   // buffer.
   kvec_t(uint64_t) update_channels;
+  // array of lua callbacks for buffer updates.
   kvec_t(BufUpdateCallbacks) update_callbacks;
 
+  // whether an update callback has requested codepoint size of deleted regions.
+  bool update_need_codepoints;
+
+  // Measurements of the deleted or replaced region since the last update
+  // event. Some consumers of buffer changes need to know the byte size (like
+  // tree-sitter) or the corresponding UTF-32/UTF-16 size (like LSP) of the
+  // deleted text.
   size_t deleted_bytes;
+  size_t deleted_codepoints;
+  size_t deleted_codeunits;
+
+  // The number for times the current line has been flushed in the memline.
   int flush_count;
 
   int b_diff_failed;    // internal diff failed for this buffer