Fix escape_string

Author: mattn

autoload/vimlparser.vim

@@ -4875,9 +4875,10 @@ function! s:Compiler.compile_curlynameexpr(node)
 endfunction
 
 function! s:Compiler.escape_string(str)
-  let str = '"'
   let m = {"\n": '\n', "\t": '\t', "\r": '\r'}
-  for c in split(a:str, '\zs')
+  let str = '"'
+  for i in range(len(a:str))
+    let c = a:str[i]
     if has_key(m, c)
       let str .= m[c]
     else

js/vimlparser.js

@@ -4859,11 +4859,12 @@ Compiler.prototype.compile_curlynameexpr = function(node) {
 }
 
 Compiler.prototype.escape_string = function(str) {
-    var str = "\"";
     var m = {"\n":"\\n", "\t":"\\t", "\r":"\\r"};
-    var __c13 = viml_split(str, "\\zs");
+    var str = "\"";
+    var __c13 = viml_range(viml_len(str));
     for (var __i13 = 0; __i13 < __c13.length; ++__i13) {
-        var c = __c13[__i13];
+        var i = __c13[__i13];
+        var c = str[i];
         if (viml_has_key(m, c)) {
             str += m[c];
         }

py/vimlparser.py

@@ -3808,9 +3808,10 @@ def compile_curlynameexpr(self, node):
         return "{" + self.compile(node.value) + "}"
 
     def escape_string(self, str):
-        str = "\""
         m = AttributeDict({"\n":"\\n", "\t":"\\t", "\r":"\\r"})
-        for c in viml_split(str, "\\zs"):
+        str = "\""
+        for i in viml_range(viml_len(str)):
+            c = str[i]
             if viml_has_key(m, c):
                 str += m[c]
             else: