Add map-<expr> support in neosnippet#anonymous()

autoload/neosnippet.vim

@@ -52,8 +52,8 @@ endfunction"}}}
 function! neosnippet#jumpable() "{{{
   return neosnippet#mappings#jumpable()
 endfunction"}}}
-function! neosnippet#anonymous(snippet, ...) "{{{
-  return neosnippet#mappings#_anonymous(a:snippet, get(a:000, 0, {}))
+function! neosnippet#anonymous(snippet) "{{{
+  return neosnippet#mappings#_anonymous(a:snippet)
 endfunction"}}}
 function! neosnippet#expand(trigger) "{{{
   return neosnippet#mappings#_expand(a:trigger)

autoload/neosnippet/mappings.vim

@@ -136,34 +136,17 @@ function! neosnippet#mappings#_expand_target_trigger(trigger) "{{{
   endif
 endfunction"}}}
 
-function! neosnippet#mappings#_anonymous(snippet, options) "{{{
-  let cur_text = neosnippet#util#get_cur_text()
-  let options = extend(
-        \ neosnippet#parser#_initialize_snippet_options(),
-        \ a:options)
-  call neosnippet#view#_insert(a:snippet, options, cur_text, col('.'))
-  return ''
+function! neosnippet#mappings#_anonymous(snippet) "{{{
+  let [cur_text, col, expr] = s:pre_trigger()
+  let expr .= printf("\<ESC>:call neosnippet#view#_insert(%s, {}, %s, %d)\<CR>",
+        \ string(a:snippet), string(cur_text), col)
+
+  return expr
 endfunction"}}}
 function! neosnippet#mappings#_expand(trigger) "{{{
-  call neosnippet#init#check()
+  let [cur_text, col, expr] = s:pre_trigger()
 
-  let cur_text = neosnippet#util#get_cur_text()
-
-  let col = col('.')
-  if mode() !=# 'i'
-    " Fix column.
-    let col += 2
-  endif
-
-  " Get selected text.
-  let neosnippet = neosnippet#variables#current_neosnippet()
-  let neosnippet.trigger = 1
-  let expr = ''
-  if mode() ==# 's' && neosnippet.optional_tabstop
-    let expr .= "\<C-o>\"_d"
-  endif
-
-  let expr .= printf("\<ESC>:call neosnippet#view#_expand(%s,%d, %s)\<CR>",
+  let expr .= printf("\<ESC>:call neosnippet#view#_expand(%s, %d, %s)\<CR>",
         \ string(cur_text), col, string(a:trigger))
 
   return expr
@@ -208,6 +191,15 @@ function! s:SID_PREFIX() "{{{
 endfunction"}}}
 
 function! neosnippet#mappings#_trigger(function) "{{{
+  let [cur_text, col, expr] = s:pre_trigger()
+
+  let expr .= printf("\<ESC>:call %s(%s,%d)\<CR>",
+        \ a:function, string(cur_text), col)
+
+  return expr
+endfunction"}}}
+
+function! s:pre_trigger() "{{{
   call neosnippet#init#check()
 
   let cur_text = neosnippet#util#get_cur_text()
@@ -226,10 +218,7 @@ function! neosnippet#mappings#_trigger(function) "{{{
     let expr .= "\<C-o>\"_d"
   endif
 
-  let expr .= printf("\<ESC>:call %s(%s,%d)\<CR>",
-        \ a:function, string(cur_text), col)
-
-  return expr
+  return [cur_text, col, expr]
 endfunction"}}}
 
 " Plugin key-mappings.

autoload/neosnippet/view.vim

@@ -51,6 +51,10 @@ function! neosnippet#view#_expand(cur_text, col, trigger_name) "{{{
   call neosnippet#view#_insert(snippet.snip, snippet.options, cur_text, a:col)
 endfunction"}}}
 function! neosnippet#view#_insert(snippet, options, cur_text, col) "{{{
+  let options = extend(
+        \ neosnippet#parser#_initialize_snippet_options(),
+        \ a:options)
+
   let snip_word = a:snippet
   if snip_word =~ '\\\@<!`.*\\\@<!`'
     let snip_word = s:eval_snippet(snip_word)
@@ -100,7 +104,7 @@ function! neosnippet#view#_insert(snippet, options, cur_text, col) "{{{
     endif
     call setline('.', snippet_lines[0])
 
-    if begin_line != end_line || a:options.indent
+    if begin_line != end_line || options.indent
       call s:indent_snippet(begin_line, end_line)
     endif
 

doc/neosnippet.txt

@@ -320,17 +320,19 @@ neosnippet#expandable_or_jumpable()
 		\ "\<Plug>(neosnippet_expand_or_jump)" : "\<C-n>"
 <
 						*neosnippet#anonymous()*
-neosnippet#anonymous({snippet}, [{options}])
+neosnippet#anonymous({snippet})
 		It defines anonymous snippet.
 		{snippet} is snippet definition.
 		{options} is snippet option.
 		You can expand snippet definition without defining snippet
 		trigger.
-		Note: You cannot use it in |map-<expr>|.  It changes the
-		buffer text.
+		Note: You can use this function with |map-<expr>|.
 >
 		inoremap <silent> ((
 		\ <C-r>=neosnippet#anonymous('\left(${1}\right)${0}')<CR>
+		" OR
+		inoremap <expr><silent> ((
+		\ neosnippet#anonymous('\left(${1}\right)${0}')
 <
 						*neosnippet#expand()*
 neosnippet#expand({trigger})