fixed parse error for white space in function argument list. syngan/vim-vimlint#62

Author: ynkdir

autoload/vimlparser.vim

@@ -1229,12 +1229,14 @@ function! s:VimLParser.parse_cmd_function()
         let varnode.pos = token.pos
         let varnode.value = token.value
         call add(node.rlist, varnode)
-        " XXX: Vim doesn't skip white space before comma.  F(a ,b) => E475
-        if s:iswhite(self.reader.p(0))
-          throw s:Err(printf('unexpected token: %s', self.reader.p(0)), self.reader.getpos())
-        endif
+        let pc = self.reader.p(0)
+        let ppos = self.reader.getpos()
         let token = tokenizer.get()
         if token.type == s:TOKEN_COMMA
+          " XXX: Vim doesn't skip white space before comma.  F(a ,b) => E475
+          if s:iswhite(pc)
+            throw s:Err('E475: Invalid argument: White space is not allowed before comma', ppos)
+          endif
           " XXX: Vim allows last comma.  F(a, b, ) => OK
           if tokenizer.peek().type == s:TOKEN_PCLOSE
             call tokenizer.get()

test/test_xxx_err_funcarg_space_comma.ok

@@ -1 +1 @@
-vimlparser: unexpected token:  : line 1 col 13
+vimlparser: E475: Invalid argument: White space is not allowed before comma: line 19 col 14

test/test_xxx_err_funcarg_space_comma.vim

@@ -1,2 +1,20 @@
-function F(a ,b)
+function OK1(a)
+endfunction
+function OK2( a)
+endfunction
+function OK3(a )
+endfunction
+function OK4( a )
+endfunction
+function OK5(a,b)
+endfunction
+function OK6(a, b)
+endfunction
+function OK7( a, b)
+endfunction
+function OK8(a, b )
+endfunction
+function OK9( a, b )
+endfunction
+function NG(a ,b)
 endfunction