diff --git a/lua/navigator/render.lua b/lua/navigator/render.lua
index 95fc086..36f799a 100644
--- a/lua/navigator/render.lua
+++ b/lua/navigator/render.lua
@@ -1,7 +1,9 @@
-local log = require('guihua.log').info
-local trace = require('guihua.log').trace
-local M = {}
+local util = require('navigator.util')
+local log = util.log
+local trace = util.trace
 local clone = require('guihua.util').clone
+
+local M = {}
 local function filename(url)
   if url == nil then
     return ''
@@ -162,15 +164,7 @@ function M.prepare_for_render(items, opts)
       end
       if trim then
         item.text = string.sub(item.text, 1, l)
-        local _, j = string.gsub(item.text, [["]], '')
-        if j % 2 == 1 then
-          item.text = item.text .. '"'
-        end
-        _, j = string.gsub(item.text, [[']], '')
-        if j % 2 == 1 then
-          item.text = item.text .. [[']]
-        end
-        item.text = item.text .. ''
+        item.text = util.sub_match(item.text)
         -- let check if there are unmatched "/'
       end
       if #space + #item.text + #ts_report >= win_width then
diff --git a/lua/navigator/treesitter.lua b/lua/navigator/treesitter.lua
index 06395de..599fcfb 100644
--- a/lua/navigator/treesitter.lua
+++ b/lua/navigator/treesitter.lua
@@ -193,7 +193,8 @@ function M.ref_context(opts)
   local text = table.concat(lines, separator)
   local text_len = #text
   if text_len > indicator_size then
-    return '' .. text:sub(text_len - indicator_size, text_len)
+    local str = text:sub(1, text_len)
+    return util.sub_match(str)
   end
 
   return text
diff --git a/lua/navigator/util.lua b/lua/navigator/util.lua
index bb79d5d..9aac780 100644
--- a/lua/navigator/util.lua
+++ b/lua/navigator/util.lua
@@ -556,4 +556,17 @@ function M.dirname(pathname)
   return result
 end
 
+function M.sub_match(str)
+  local _, j = string.gsub(str, [["]], '')
+  if j % 2 == 1 then
+    str = str .. '"'
+  end
+  _, j = string.gsub(str, [[']], '')
+  if j % 2 == 1 then
+    str = str .. [[']]
+  end
+  str = str .. ''
+  return str
+end
+
 return M