retain raw filter str on filt objects

libmproxy/filt.py

@@ -343,7 +343,9 @@ bnf = _make()
 
 def parse(s):
     try:
-        return bnf.parseString(s, parseAll=True)[0]
+        filt = bnf.parseString(s, parseAll=True)[0]
+        filt.pattern = s
+        return filt
     except pp.ParseException:
         return None
     except ValueError:

libmproxy/flow.py

@@ -346,11 +346,13 @@ class State(object):
         # These are compiled filt expressions:
         self._limit = None
         self.intercept = None
-        self._limit_txt = None
 
     @property
     def limit_txt(self):
-        return self._limit_txt
+        if self.filt:
+            return self.filt.pattern
+        else:
+            return None
 
     def flow_count(self):
         return len(self._flow_list)
@@ -407,10 +409,8 @@ class State(object):
             if not f:
                 return "Invalid filter expression."
             self._limit = f
-            self._limit_txt = txt
         else:
             self._limit = None
-            self._limit_txt = None
         self.recalculate_view()
 
     def set_intercept(self, txt):