cpython/Tools/idle/StackViewer.py

314 lines
10 KiB
Python

import string
import sys
import os
from Tkinter import *
import linecache
from repr import Repr
class StackViewer:
def __init__(self, root=None, flist=None):
self.flist = flist
# Create root and/or toplevel window
if not root:
import Tkinter
root = Tkinter._default_root
if not root:
root = top = Tk()
else:
top = Toplevel(root)
self.top.protocol("WM_DELETE_WINDOW", self.close)
self.root = root
self.top = top
top.wm_title("Stack viewer")
# Create help label
self.helplabel = Label(top,
text="Click once to view variables; twice for source",
borderwidth=2, relief="groove")
self.helplabel.pack(fill="x")
# Create top frame, with scrollbar and listbox
self.topframe = Frame(top)
self.topframe.pack(fill="both", expand=1)
self.vbar = Scrollbar(self.topframe, name="vbar")
self.vbar.pack(side="right", fill="y")
self.listbox = Listbox(self.topframe, exportselection=0,
takefocus=1, width=60)
self.listbox.pack(expand=1, fill="both")
# Tie listbox and scrollbar together
self.vbar["command"] = self.listbox.yview
self.listbox["yscrollcommand"] = self.vbar.set
# Bind events to the list box
self.listbox.bind("<ButtonRelease-1>", self.click_event)
self.listbox.bind("<Double-ButtonRelease-1>", self.double_click_event)
self.listbox.bind("<ButtonPress-3>", self.popup_event)
self.listbox.bind("<Key-Up>", self.up_event)
self.listbox.bind("<Key-Down>", self.down_event)
# Create status label
self.statuslabel = Label(top, text="status")
self.statuslabel.pack(fill="x")
# Load the stack
linecache.checkcache()
stack = getstack()
self.load_stack(stack)
self.statuslabel.config(text=getexception())
def close(self):
self.top.destroy()
def load_stack(self, stack):
self.stack = stack
l = self.listbox
l.delete(0, END)
if len(stack) > 10:
l["height"] = 10
self.topframe.pack(expand=1)
else:
l["height"] = len(stack)
self.topframe.pack(expand=0)
for frame, lineno in stack:
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 = string.strip(sourceline)
if funcname in ("?", "", None):
item = "%s, line %d: %s" % (modname, lineno, sourceline)
else:
item = "%s.%s(), line %d: %s" % (modname, funcname,
lineno, sourceline)
l.insert(END, item)
l.focus_set()
l.selection_clear(0, "end")
l.activate("end")
l.see("end")
rmenu = None
def click_event(self, event):
self.listbox.activate("@%d,%d" % (event.x, event.y))
self.show_stack_frame()
return "break"
def popup_event(self, event):
if not self.rmenu:
self.make_menu()
rmenu = self.rmenu
self.event = event
self.listbox.activate("@%d,%d" % (event.x, event.y))
rmenu.tk_popup(event.x_root, event.y_root)
def make_menu(self):
rmenu = Menu(self.top, tearoff=0)
rmenu.add_command(label="Go to source line",
command=self.goto_source_line)
rmenu.add_command(label="Show stack frame",
command=self.show_stack_frame)
self.rmenu = rmenu
def goto_source_line(self):
index = self.listbox.index("active")
self.show_source(index)
def show_stack_frame(self):
index = self.listbox.index("active")
self.show_frame(index)
def double_click_event(self, event):
index = self.listbox.index("active")
self.show_source(index)
return "break"
def up_event(self, event):
index = self.listbox.index("active") - 1
if index < 0:
self.top.bell()
return "break"
self.show_frame(index)
return "break"
def down_event(self, event):
index = self.listbox.index("active") + 1
if index >= len(self.stack):
self.top.bell()
return "break"
self.show_frame(index)
return "break"
def show_source(self, index):
if not 0 <= index < len(self.stack):
self.top.bell()
return
frame, lineno = self.stack[index]
code = frame.f_code
filename = code.co_filename
if not self.flist:
self.top.bell()
return
if not os.path.exists(filename):
self.top.bell()
return
edit = self.flist.open(filename)
edit.gotoline(lineno)
localsframe = None
localsviewer = None
localsdict = None
globalsframe = None
globalsviewer = None
globalsdict = None
curframe = None
def show_frame(self, index):
if not 0 <= index < len(self.stack):
self.top.bell()
return
self.listbox.selection_clear(0, "end")
self.listbox.selection_set(index)
self.listbox.activate(index)
self.listbox.see(index)
self.listbox.focus_set()
frame, lineno = self.stack[index]
if frame is self.curframe:
return
self.curframe = None
if frame.f_globals is not self.globalsdict:
self.show_globals(frame)
self.show_locals(frame)
self.curframe = frame
def show_globals(self, frame):
title = "Global Variables"
if frame.f_globals.has_key("__name__"):
try:
name = str(frame.f_globals["__name__"]) + ""
except:
name = ""
if name:
title = title + " in module " + name
self.globalsdict = None
if self.globalsviewer:
self.globalsviewer.close()
self.globalsviewer = None
if not self.globalsframe:
self.globalsframe = Frame(self.top)
self.globalsdict = frame.f_globals
self.globalsviewer = NamespaceViewer(
self.globalsframe,
title,
self.globalsdict)
self.globalsframe.pack(fill="both", side="bottom")
def show_locals(self, frame):
self.localsdict = None
if self.localsviewer:
self.localsviewer.close()
self.localsviewer = None
if frame.f_locals is not frame.f_globals:
title = "Local Variables"
code = frame.f_code
funcname = code.co_name
if funcname not in ("?", "", None):
title = title + " in " + funcname
if not self.localsframe:
self.localsframe = Frame(self.top)
self.localsdict = frame.f_locals
self.localsviewer = NamespaceViewer(
self.localsframe,
title,
self.localsdict)
self.localsframe.pack(fill="both", side="top")
else:
if self.localsframe:
self.localsframe.forget()
def getstack(t=None, f=None):
if t is None:
t = sys.last_traceback
stack = []
if t and t.tb_frame is f:
t = t.tb_next
while f is not None:
stack.append((f, f.f_lineno))
if f is self.botframe:
break
f = f.f_back
stack.reverse()
while t is not None:
stack.append((t.tb_frame, t.tb_lineno))
t = t.tb_next
return stack
def getexception(type=None, value=None):
if type is None:
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
class NamespaceViewer:
def __init__(self, frame, title, dict):
width = 0
height = 20*len(dict) # XXX 20 == observed height of Entry widget
self.frame = frame
self.title = title
self.dict = dict
self.repr = Repr()
self.repr.maxstring = 60
self.repr.maxother = 60
self.label = Label(frame, text=title, borderwidth=2, relief="groove")
self.label.pack(fill="x")
self.vbar = vbar = Scrollbar(frame, name="vbar")
vbar.pack(side="right", fill="y")
self.canvas = canvas = Canvas(frame,
height=min(300, max(40, height)),
scrollregion=(0, 0, width, height))
canvas.pack(side="left", fill="both", expand=1)
vbar["command"] = canvas.yview
canvas["yscrollcommand"] = vbar.set
self.subframe = subframe = Frame(canvas)
self.sfid = canvas.create_window(0, 0, window=subframe, anchor="nw")
names = dict.keys()
names.sort()
row = 0
for name in names:
value = dict[name]
svalue = self.repr.repr(value) # repr(value)
l = Label(subframe, text=name)
l.grid(row=row, column=0, sticky="nw")
## l = Label(subframe, text=svalue, justify="l", wraplength=300)
l = Entry(subframe, width=0, borderwidth=0)
l.insert(0, svalue)
## l["state"] = "disabled"
l.grid(row=row, column=1, sticky="nw")
row = row+1
frame.update_idletasks() # Alas!
width = subframe.winfo_reqwidth()
height = subframe.winfo_reqheight()
canvas["scrollregion"] = (0, 0, width, height)
if height > 300:
canvas["height"] = 300
frame.pack(expand=1)
else:
canvas["height"] = height
frame.pack(expand=0)
def close(self):
for c in self.subframe, self.label, self.vbar, self.canvas:
try:
c.destroy()
except:
pass