1 files changed, 74 insertions, 0 deletions
diff --git a/runtime/lua/vim/treesitter.lua b/runtime/lua/vim/treesitter.lua
index 82d41070ee..6431162799 100644
--- a/runtime/lua/vim/treesitter.lua
+++ b/runtime/lua/vim/treesitter.lua
@@ -154,6 +154,28 @@ function M.get_node_range(node_or_range)
   end
 end
 
+---Determines whether (line, col) position is in node range
+---
+---@param node Node defining the range
+---@param line A line (0-based)
+---@param col A column (0-based)
+function M.is_in_node_range(node, line, col)
+  local start_line, start_col, end_line, end_col = M.get_node_range(node)
+  if line >= start_line and line <= end_line then
+    if line == start_line and line == end_line then
+      return col >= start_col and col < end_col
+    elseif line == start_line then
+      return col >= start_col
+    elseif line == end_line then
+      return col < end_col
+    else
+      return true
+    end
+  else
+    return false
+  end
+end
+
 ---Determines if a node contains a range
 ---@param node table The node
 ---@param range table The range
@@ -167,4 +189,56 @@ function M.node_contains(node, range)
   return start_fits and end_fits
 end
 
+---Gets a list of captures for a given cursor position
+---@param bufnr number The buffer number
+---@param row number The position row
+---@param col number The position column
+---
+---@returns (table) A table of captures
+function M.get_captures_at_position(bufnr, row, col)
+  if bufnr == 0 then
+    bufnr = a.nvim_get_current_buf()
+  end
+  local buf_highlighter = M.highlighter.active[bufnr]
+
+  if not buf_highlighter then
+    return {}
+  end
+
+  local matches = {}
+
+  buf_highlighter.tree:for_each_tree(function(tstree, tree)
+    if not tstree then
+      return
+    end
+
+    local root = tstree:root()
+    local root_start_row, _, root_end_row, _ = root:range()
+
+    -- Only worry about trees within the line range
+    if root_start_row > row or root_end_row < row then
+      return
+    end
+
+    local q = buf_highlighter:get_query(tree:lang())
+
+    -- Some injected languages may not have highlight queries.
+    if not q:query() then
+      return
+    end
+
+    local iter = q:query():iter_captures(root, buf_highlighter.bufnr, row, row + 1)
+
+    for capture, node, metadata in iter do
+      if M.is_in_node_range(node, row, col) then
+        local c = q._query.captures[capture] -- name of the capture in the query
+        if c ~= nil then
+          table.insert(matches, { capture = c, priority = metadata.priority })
+        end
+      end
+    end
+  end, true)
+  return matches
+end
+
 return M