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Protect against accessing an empty stack.

This commit is contained in:
Guido van Rossum 1999-02-01 19:34:53 +00:00
parent 6aa42579be
commit 14b2d30b11
1 changed files with 11 additions and 2 deletions
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13
Tools/idle/StackViewer.py
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@ -100,6 +100,7 @@ class StackViewer(ScrolledList):
ScrolledList.__init__(self, master)
self.flist = flist
self.browser = browser
self.stack = []
def load_stack(self, stack, index=None):
self.stack = stack
@ -132,6 +133,10 @@ class StackViewer(ScrolledList):
if index is not None:
self.select(index)
def popup_event(self, event):
if self.stack:
return ScrolledList.popup_event(self, event)
def fill_menu(self):
menu = self.menu
menu.add_command(label="Go to source line",
@ -140,7 +145,8 @@ class StackViewer(ScrolledList):
command=self.show_stack_frame)
def on_select(self, index):
self.browser.show_frame(self.stack[index])
if 0 <= index < len(self.stack):
self.browser.show_frame(self.stack[index])
def on_double(self, index):
self.show_source(index)
@ -151,9 +157,12 @@ class StackViewer(ScrolledList):
def show_stack_frame(self):
index = self.listbox.index("active")
self.browser.show_frame(self.stack[index])
if 0 <= index < len(self.stack):
self.browser.show_frame(self.stack[index])
def show_source(self, index):
if not (0 <= index < len(self.stack)):
return
frame, lineno = self.stack[index]
code = frame.f_code
filename = code.co_filename