1 files changed, 9 insertions, 4 deletions
diff --git a/Lib/idlelib/idle_test/mock_tk.py b/Lib/idlelib/idle_test/mock_tk.py
index 576f7d5..b736bd0 100644
--- a/Lib/idlelib/idle_test/mock_tk.py
+++ b/Lib/idlelib/idle_test/mock_tk.py
@@ -3,6 +3,9 @@
 A gui object is anything with a master or parent parameter, which is
 typically required in spite of what the doc strings say.
 """
+import re
+from _tkinter import TclError
+
 
 class Event:
     '''Minimal mock with attributes for testing event handlers.
@@ -22,6 +25,7 @@ class Event:
         "Create event with attributes needed for test"
         self.__dict__.update(kwds)
 
+
 class Var:
     "Use for String/Int/BooleanVar: incomplete"
     def __init__(self, master=None, value=None, name=None):
@@ -33,6 +37,7 @@ class Var:
     def get(self):
         return self.value
 
+
 class Mbox_func:
     """Generic mock for messagebox functions, which all have the same signature.
 
@@ -50,6 +55,7 @@ class Mbox_func:
         self.kwds = kwds
         return self.result  # Set by tester for ask functions
 
+
 class Mbox:
     """Mock for tkinter.messagebox with an Mbox_func for each function.
 
@@ -85,7 +91,6 @@ class Test(unittest.TestCase):
     showinfo = Mbox_func()     # None
     showwarning = Mbox_func()  # None
 
-from _tkinter import TclError
 
 class Text:
     """A semi-functional non-gui replacement for tkinter.Text text editors.
@@ -154,6 +159,8 @@ class Text:
         if char.endswith(' lineend') or char == 'end':
             return line, linelength
             # Tk requires that ignored chars before ' lineend' be valid int
+        if m := re.fullmatch(r'end-(\d*)c', char, re.A):  # Used by hyperparser.
+            return line, linelength - int(m.group(1))
 
         # Out of bounds char becomes first or last index of line
         char = int(char)
@@ -177,7 +184,6 @@ class Text:
             n -= 1
             return n, len(self.data[n]) + endflag
 
-
     def insert(self, index, chars):
         "Insert chars before the character at index."
 
@@ -193,7 +199,6 @@ class Text:
         self.data[line+1:line+1] = chars[1:]
         self.data[line+len(chars)-1] += after
 
-
     def get(self, index1, index2=None):
         "Return slice from index1 to index2 (default is 'index1+1')."
 
@@ -212,7 +217,6 @@ class Text:
             lines.append(self.data[endline][:endchar])
             return ''.join(lines)
 
-
     def delete(self, index1, index2=None):
         '''Delete slice from index1 to index2 (default is 'index1+1').
 
@@ -297,6 +301,7 @@ class Text:
         "Bind to this widget at event sequence a call to function func."
         pass
 
+
 class Entry:
     "Mock for tkinter.Entry."
     def focus_set(self):