import os
import sys
import linecache

from idlelib.TreeWidget import TreeNode, TreeItem, ScrolledCanvas
from idlelib.ObjectBrowser import ObjectTreeItem, make_objecttreeitem

def StackBrowser(root, flist=None, tb=None, top=None):
if top is None:
from tkinter import Toplevel
top = Toplevel(root)
sc = ScrolledCanvas(top, bg="white", highlightthickness=0)
sc.frame.pack(expand=1, fill="both")
item = StackTreeItem(flist, tb)
node = TreeNode(sc.canvas, None, item)
node.expand()

class StackTreeItem(TreeItem):

def __init__(self, flist=None, tb=None):
self.flist = flist
self.stack = self.get_stack(tb)
self.text = self.get_exception()

def get_stack(self, tb):
if tb is None:
tb = sys.last_traceback
stack = []
if tb and tb.tb_frame is None:
tb = tb.tb_next
while tb is not None:
stack.append((tb.tb_frame, tb.tb_lineno))
tb = tb.tb_next
return stack

def get_exception(self):
type = sys.last_type
value = sys.last_value
if hasattr(type, "__name__"):
type = type.__name__
s = str(type)
if value is not None:
s = s + ": " + str(value)
return s

def GetText(self):
return self.text

def GetSubList(self):
sublist = []
for info in self.stack:
item = FrameTreeItem(info, self.flist)
sublist.append(item)
return sublist

class FrameTreeItem(TreeItem):

def __init__(self, info, flist):
self.info = info
self.flist = flist

def GetText(self):
frame, lineno = self.info
try:
modname = frame.f_globals["__name__"]
except:
modname = "?"
code = frame.f_code
filename = code.co_filename
funcname = code.co_name
sourceline = linecache.getline(filename, lineno)
sourceline = sourceline.strip()
if funcname in ("?", "", None):
item = "%s, line %d: %s" % (modname, lineno, sourceline)
else:
item = "%s.%s(...), line %d: %s" % (modname, funcname,
lineno, sourceline)
return item

def GetSubList(self):
frame, lineno = self.info
sublist = []
if frame.f_globals is not frame.f_locals:
item = VariablesTreeItem("<locals>", frame.f_locals, self.flist)
sublist.append(item)
item = VariablesTreeItem("<globals>", frame.f_globals, self.flist)
sublist.append(item)
return sublist

def OnDoubleClick(self):
if self.flist:
frame, lineno = self.info
filename = frame.f_code.co_filename
if os.path.isfile(filename):
self.flist.gotofileline(filename, lineno)

class VariablesTreeItem(ObjectTreeItem):

def GetText(self):
return self.labeltext

def GetLabelText(self):
return None

def IsExpandable(self):
return len(self.object) > 0

def keys(self):
return list(self.object.keys())

def GetSubList(self):
sublist = []
for key in self.keys():
try:
value = self.object[key]
except KeyError:
continue
def setfunction(value, key=key, object=self.object):
object[key] = value
item = make_objecttreeitem(key + " =", value, setfunction)
sublist.append(item)
return sublist