diff --git a/autoload/SpaceVim/api/vim/highlight.vim b/autoload/SpaceVim/api/vim/highlight.vim
index 6daab2df0..1d234ef3d 100644
--- a/autoload/SpaceVim/api/vim/highlight.vim
+++ b/autoload/SpaceVim/api/vim/highlight.vim
@@ -161,6 +161,16 @@ function! s:self.syntax_at(...) abort
   return synIDattr(synID(l:lnum, l:col, 1), 'name')
 endfunction
 
+let s:string_hi = {
+      \ 'c' : 'cCppString',
+      \ 'cpp' : 'cCppString',
+      \ 'python' : 'pythonString',
+      \ }
+
+function! s:self.is_string(l, c) abort
+  return synIDattr(synID(a:l, a:c, 1), 'name') == get(s:string_hi, &filetype, &filetype . 'String')
+endfunction
+
 function! s:self.syntax_of(pattern, ...) abort
   if a:0 < 1
     let l:nth = 1
diff --git a/autoload/SpaceVim/layers/core.vim b/autoload/SpaceVim/layers/core.vim
index 1035458bb..30e68ac34 100644
--- a/autoload/SpaceVim/layers/core.vim
+++ b/autoload/SpaceVim/layers/core.vim
@@ -48,6 +48,7 @@ let s:FILE = SpaceVim#api#import('file')
 let s:MESSAGE = SpaceVim#api#import('vim#message')
 let s:CMP = SpaceVim#api#import('vim#compatible')
 let s:NOTI = SpaceVim#api#import('notify')
+let s:HI = SpaceVim#api#import('vim#highlight')
 
 
 function! SpaceVim#layers#core#plugins() abort
@@ -542,12 +543,12 @@ function! s:jump_last_change() abort
 endfunction
 
 function! s:split_string(newline) abort
-  if s:is_string(line('.'), col('.'))
+  if s:HI.is_string(line('.'), col('.'))
     let save_cursor = getcurpos()
     let c = col('.')
     let sep = ''
     while c > 0
-      if s:is_string(line('.'), c)
+      if s:HI.is_string(line('.'), c)
         let c -= 1
       else
         if !empty(get(get(g:string_info, &filetype, {}), 'quotes_hi', []))
@@ -579,18 +580,6 @@ function! s:split_string(newline) abort
   endif
 endfunction
 
-
-" @toto add sting highlight for other filetype
-let s:string_hi = {
-      \ 'c' : 'cCppString',
-      \ 'cpp' : 'cCppString',
-      \ 'python' : 'pythonString',
-      \ }
-
-function! s:is_string(l, c) abort
-  return synIDattr(synID(a:l, a:c, 1), 'name') == get(s:string_hi, &filetype, &filetype . 'String')
-endfunction
-
 " function() wrapper
 if v:version > 703 || v:version == 703 && has('patch1170')
   function! s:_function(fstr) abort
diff --git a/autoload/SpaceVim/layers/edit.vim b/autoload/SpaceVim/layers/edit.vim
index 2629fc12f..06cb739c2 100644
--- a/autoload/SpaceVim/layers/edit.vim
+++ b/autoload/SpaceVim/layers/edit.vim
@@ -60,6 +60,7 @@ let s:LIST = SpaceVim#api#import('data#list')
 let s:VIM = SpaceVim#api#import('vim')
 let s:CMP = SpaceVim#api#import('vim#compatible')
 let s:BUFFER = SpaceVim#api#import('vim#buffer')
+let s:HI = SpaceVim#api#import('vim#highlight')
 
 let s:autosave_timeout = 0
 let s:autosave_events = []
@@ -798,13 +799,13 @@ endfunction
 
 
 function! s:join_string_with() abort
-  if s:is_string(line('.'), col('.'))
+  if s:HI.is_string(line('.'), col('.'))
     let c = col('.')
     let a = 0
     let b = 0
     let _c = c
     while c > 0
-      if s:is_string(line('.'), c)
+      if s:HI.is_string(line('.'), c)
         let c -= 1
       else
         let a = c
@@ -813,7 +814,7 @@ function! s:join_string_with() abort
     endwhile
     let c = _c
     while c > 0
-      if s:is_string(line('.'), c)
+      if s:HI.is_string(line('.'), c)
         let c += 1
       else
         let b = c
@@ -827,16 +828,6 @@ function! s:join_string_with() abort
   endif
 endfunction
 
-let s:string_hi = {
-      \ 'c' : 'cCppString',
-      \ 'cpp' : 'cCppString',
-      \ }
-
-function! s:is_string(l, c) abort
-  return synIDattr(synID(a:l, a:c, 1), 'name') == get(s:string_hi, &filetype, &filetype . 'String')
-endfunction
-
-
 " function() wrapper
 if v:version > 703 || v:version == 703 && has('patch1170')
   function! s:_function(fstr) abort