#! /usr/bin/env python3

import sys
if __name__ == "__main__":
 sys.modules['idlelib.pyshell'] = sys.modules['__main__']

try:
 from tkinter import *
except ImportError:
 print("** IDLE can't import Tkinter.\n"
 "Your Python may not be configured for Tk. **", file=sys.__stderr__)
 raise SystemExit(1)

# Valid arguments for the ...Awareness call below are defined in the following.
# https://msdn.microsoft.com/en-us/library/windows/desktop/dn280512(v=vs.85).aspx
if sys.platform == 'win32':
 try:
 import ctypes
 PROCESS_SYSTEM_DPI_AWARE = 1
 ctypes.OleDLL('shcore').SetProcessDpiAwareness(PROCESS_SYSTEM_DPI_AWARE)
 except (ImportError, AttributeError, OSError):
 pass

import tkinter.messagebox as tkMessageBox
if TkVersion < 8.5:
 root = Tk() # otherwise create root in main
 root.withdraw()
 from idlelib.run import fix_scaling
 fix_scaling(root)
 tkMessageBox.showerror("Idle Cannot Start",
 "Idle requires tcl/tk 8.5+, not %s." % TkVersion,
 parent=root)
 raise SystemExit(1)

from code import InteractiveInterpreter
import linecache
import os
import os.path
from platform import python_version
import re
import socket
import subprocess
from textwrap import TextWrapper
import threading
import time
import tokenize
import warnings

from idlelib.colorizer import ColorDelegator
from idlelib.config import idleConf
from idlelib import debugger
from idlelib import debugger_r
from idlelib.editor import EditorWindow, fixwordbreaks
from idlelib.filelist import FileList
from idlelib.outwin import OutputWindow
from idlelib import rpc
from idlelib.run import idle_formatwarning, StdInputFile, StdOutputFile
from idlelib.undo import UndoDelegator

HOST = '127.0.0.1' # python execution server on localhost loopback
PORT = 0 # someday pass in host, port for remote debug capability

# Override warnings module to write to warning_stream. Initialize to send IDLE
# internal warnings to the console. ScriptBinding.check_syntax() will
# temporarily redirect the stream to the shell window to display warnings when
# checking user's code.
warning_stream = sys.__stderr__ # None, at least on Windows, if no console.

def idle_showwarning(
 message, category, filename, lineno, file=None, line=None):
 """Show Idle-format warning (after replacing warnings.showwarning).

 The differences are the formatter called, the file=None replacement,
 which can be None, the capture of the consequence AttributeError,
 and the output of a hard-coded prompt.
 """
 if file is None:
 file = warning_stream
 try:
 file.write(idle_formatwarning(
 message, category, filename, lineno, line=line))
 file.write(">>> ")
 except (AttributeError, OSError):
 pass # if file (probably __stderr__) is invalid, skip warning.

_warnings_showwarning = None

def capture_warnings(capture):
 "Replace warning.showwarning with idle_showwarning, or reverse."

 global _warnings_showwarning
 if capture:
 if _warnings_showwarning is None:
 _warnings_showwarning = warnings.showwarning
 warnings.showwarning = idle_showwarning
 else:
 if _warnings_showwarning is not None:
 warnings.showwarning = _warnings_showwarning
 _warnings_showwarning = None

capture_warnings(True)

def extended_linecache_checkcache(filename=None,
 orig_checkcache=linecache.checkcache):
 """Extend linecache.checkcache to preserve the <pyshell#...> entries

 Rather than repeating the linecache code, patch it to save the
 <pyshell#...> entries, call the original linecache.checkcache()
 (skipping them), and then restore the saved entries.

 orig_checkcache is bound at definition time to the original
 method, allowing it to be patched.
 """
 cache = linecache.cache
 save = {}
 for key in list(cache):
 if key[:1] + key[-1:] == '<>':
 save[key] = cache.pop(key)
 orig_checkcache(filename)
 cache.update(save)

# Patch linecache.checkcache():
linecache.checkcache = extended_linecache_checkcache


class PyShellEditorWindow(EditorWindow):
 "Regular text edit window in IDLE, supports breakpoints"

 def __init__(self, *args):
 self.breakpoints = []
 EditorWindow.__init__(self, *args)
 self.text.bind("<<set-breakpoint-here>>", self.set_breakpoint_here)
 self.text.bind("<<clear-breakpoint-here>>", self.clear_breakpoint_here)
 self.text.bind("<<open-python-shell>>", self.flist.open_shell)

 #TODO: don't read/write this from/to .idlerc when testing
 self.breakpointPath = os.path.join(
 idleConf.userdir, 'breakpoints.lst')
 # whenever a file is changed, restore breakpoints
 def filename_changed_hook(old_hook=self.io.filename_change_hook,
 self=self):
 self.restore_file_breaks()
 old_hook()
 self.io.set_filename_change_hook(filename_changed_hook)
 if self.io.filename:
 self.restore_file_breaks()
 self.color_breakpoint_text()

 rmenu_specs = [
 ("Cut", "<<cut>>", "rmenu_check_cut"),
 ("Copy", "<<copy>>", "rmenu_check_copy"),
 ("Paste", "<<paste>>", "rmenu_check_paste"),
 (None, None, None),
 ("Set Breakpoint", "<<set-breakpoint-here>>", None),
 ("Clear Breakpoint", "<<clear-breakpoint-here>>", None)
 ]

 def color_breakpoint_text(self, color=True):
 "Turn colorizing of breakpoint text on or off"
 if self.io is None:
 # possible due to update in restore_file_breaks
 return
 if color:
 theme = idleConf.CurrentTheme()
 cfg = idleConf.GetHighlight(theme, "break")
 else:
 cfg = {'foreground': '', 'background': ''}
 self.text.tag_config('BREAK', cfg)

 def set_breakpoint(self, lineno):
 text = self.text
 filename = self.io.filename
 text.tag_add("BREAK", "%d.0" % lineno, "%d.0" % (lineno+1))
 try:
 self.breakpoints.index(lineno)
 except ValueError: # only add if missing, i.e. do once
 self.breakpoints.append(lineno)
 try: # update the subprocess debugger
 debug = self.flist.pyshell.interp.debugger
 debug.set_breakpoint_here(filename, lineno)
 except: # but debugger may not be active right now....
 pass

 def set_breakpoint_here(self, event=None):
 text = self.text
 filename = self.io.filename
 if not filename:
 text.bell()
 return
 lineno = int(float(text.index("insert")))
 self.set_breakpoint(lineno)

 def clear_breakpoint_here(self, event=None):
 text = self.text
 filename = self.io.filename
 if not filename:
 text.bell()
 return
 lineno = int(float(text.index("insert")))
 try:
 self.breakpoints.remove(lineno)
 except:
 pass
 text.tag_remove("BREAK", "insert linestart",\
 "insert lineend +1char")
 try:
 debug = self.flist.pyshell.interp.debugger
 debug.clear_breakpoint_here(filename, lineno)
 except:
 pass

 def clear_file_breaks(self):
 if self.breakpoints:
 text = self.text
 filename = self.io.filename
 if not filename:
 text.bell()
 return
 self.breakpoints = []
 text.tag_remove("BREAK", "1.0", END)
 try:
 debug = self.flist.pyshell.interp.debugger
 debug.clear_file_breaks(filename)
 except:
 pass

 def store_file_breaks(self):
 "Save breakpoints when file is saved"
 # XXX 13 Dec 2002 KBK Currently the file must be saved before it can
 # be run. The breaks are saved at that time. If we introduce
 # a temporary file save feature the save breaks functionality
 # needs to be re-verified, since the breaks at the time the
 # temp file is created may differ from the breaks at the last
 # permanent save of the file. Currently, a break introduced
 # after a save will be effective, but not persistent.
 # This is necessary to keep the saved breaks synched with the
 # saved file.
 #
 # Breakpoints are set as tagged ranges in the text.
 # Since a modified file has to be saved before it is
 # run, and since self.breakpoints (from which the subprocess
 # debugger is loaded) is updated during the save, the visible
 # breaks stay synched with the subprocess even if one of these
 # unexpected breakpoint deletions occurs.
 breaks = self.breakpoints
 filename = self.io.filename
 try:
 with open(self.breakpointPath, "r") as fp:
 lines = fp.readlines()
 except OSError:
 lines = []
 try:
 with open(self.breakpointPath, "w") as new_file:
 for line in lines:
 if not line.startswith(filename + '='):
 new_file.write(line)
 self.update_breakpoints()
 breaks = self.breakpoints
 if breaks:
 new_file.write(filename + '=' + str(breaks) + '\n')
 except OSError as err:
 if not getattr(self.root, "breakpoint_error_displayed", False):
 self.root.breakpoint_error_displayed = True
 tkMessageBox.showerror(title='IDLE Error',
 message='Unable to update breakpoint list:\n%s'
 % str(err),
 parent=self.text)

 def restore_file_breaks(self):
 self.text.update() # this enables setting "BREAK" tags to be visible
 if self.io is None:
 # can happen if IDLE closes due to the .update() call
 return
 filename = self.io.filename
 if filename is None:
 return
 if os.path.isfile(self.breakpointPath):
 with open(self.breakpointPath, "r") as fp:
 lines = fp.readlines()
 for line in lines:
 if line.startswith(filename + '='):
 breakpoint_linenumbers = eval(line[len(filename)+1:])
 for breakpoint_linenumber in breakpoint_linenumbers:
 self.set_breakpoint(breakpoint_linenumber)

 def update_breakpoints(self):
 "Retrieves all the breakpoints in the current window"
 text = self.text
 ranges = text.tag_ranges("BREAK")
 linenumber_list = self.ranges_to_linenumbers(ranges)
 self.breakpoints = linenumber_list

 def ranges_to_linenumbers(self, ranges):
 lines = []
 for index in range(0, len(ranges), 2):
 lineno = int(float(ranges[index].string))
 end = int(float(ranges[index+1].string))
 while lineno < end:
 lines.append(lineno)
 lineno += 1
 return lines

# XXX 13 Dec 2002 KBK Not used currently
# def saved_change_hook(self):
# "Extend base method - clear breaks if module is modified"
# if not self.get_saved():
# self.clear_file_breaks()
# EditorWindow.saved_change_hook(self)

 def _close(self):
 "Extend base method - clear breaks when module is closed"
 self.clear_file_breaks()
 EditorWindow._close(self)


class PyShellFileList(FileList):
 "Extend base class: IDLE supports a shell and breakpoints"

 # override FileList's class variable, instances return PyShellEditorWindow
 # instead of EditorWindow when new edit windows are created.
 EditorWindow = PyShellEditorWindow

 pyshell = None

 def open_shell(self, event=None):
 if self.pyshell:
 self.pyshell.top.wakeup()
 else:
 self.pyshell = PyShell(self)
 if self.pyshell:
 if not self.pyshell.begin():
 return None
 return self.pyshell


class ModifiedColorDelegator(ColorDelegator):
 "Extend base class: colorizer for the shell window itself"

 def __init__(self):
 ColorDelegator.__init__(self)
 self.LoadTagDefs()

 def recolorize_main(self):
 self.tag_remove("TODO", "1.0", "iomark")
 self.tag_add("SYNC", "1.0", "iomark")
 ColorDelegator.recolorize_main(self)

 def LoadTagDefs(self):
 ColorDelegator.LoadTagDefs(self)
 theme = idleConf.CurrentTheme()
 self.tagdefs.update({
 "stdin": {'background':None,'foreground':None},
 "stdout": idleConf.GetHighlight(theme, "stdout"),
 "stderr": idleConf.GetHighlight(theme, "stderr"),
 "console": idleConf.GetHighlight(theme, "console"),
 })

 def removecolors(self):
 # Don't remove shell color tags before "iomark"
 for tag in self.tagdefs:
 self.tag_remove(tag, "iomark", "end")

class ModifiedUndoDelegator(UndoDelegator):
 "Extend base class: forbid insert/delete before the I/O mark"

 def insert(self, index, chars, tags=None):
 try:
 if self.delegate.compare(index, "<", "iomark"):
 self.delegate.bell()
 return
 except TclError:
 pass
 UndoDelegator.insert(self, index, chars, tags)

 def delete(self, index1, index2=None):
 try:
 if self.delegate.compare(index1, "<", "iomark"):
 self.delegate.bell()
 return
 except TclError:
 pass
 UndoDelegator.delete(self, index1, index2)


class MyRPCClient(rpc.RPCClient):

 def handle_EOF(self):
 "Override the base class - just re-raise EOFError"
 raise EOFError

def restart_line(width, filename): # See bpo-38141.
 """Return width long restart line formatted with filename.

 Fill line with balanced '='s, with any extras and at least one at
 the beginning. Do not end with a trailing space.
 """
 tag = f"= RESTART: {filename or 'Shell'} ="
 if width >= len(tag):
 div, mod = divmod((width -len(tag)), 2)
 return f"{(div+mod)*'='}{tag}{div*'='}"
 else:
 return tag[:-2] # Remove ' ='.


class ModifiedInterpreter(InteractiveInterpreter):

 def __init__(self, tkconsole):
 self.tkconsole = tkconsole
 locals = sys.modules['__main__'].__dict__
 InteractiveInterpreter.__init__(self, locals=locals)
 self.restarting = False
 self.subprocess_arglist = None
 self.port = PORT
 self.original_compiler_flags = self.compile.compiler.flags

 _afterid = None
 rpcclt = None
 rpcsubproc = None

 def spawn_subprocess(self):
 if self.subprocess_arglist is None:
 self.subprocess_arglist = self.build_subprocess_arglist()
 self.rpcsubproc = subprocess.Popen(self.subprocess_arglist)

 def build_subprocess_arglist(self):
 assert (self.port!=0), (
 "Socket should have been assigned a port number.")
 w = ['-W' + s for s in sys.warnoptions]
 # Maybe IDLE is installed and is being accessed via sys.path,
 # or maybe it's not installed and the idle.py script is being
 # run from the IDLE source directory.
 del_exitf = idleConf.GetOption('main', 'General', 'delete-exitfunc',
 default=False, type='bool')
 command = "__import__('idlelib.run').run.main(%r)" % (del_exitf,)
 return [sys.executable] + w + ["-c", command, str(self.port)]

 def start_subprocess(self):
 addr = (HOST, self.port)
 # GUI makes several attempts to acquire socket, listens for connection
 for i in range(3):
 time.sleep(i)
 try:
 self.rpcclt = MyRPCClient(addr)
 break
 except OSError:
 pass
 else:
 self.display_port_binding_error()
 return None
 # if PORT was 0, system will assign an 'ephemeral' port. Find it out:
 self.port = self.rpcclt.listening_sock.getsockname()[1]
 # if PORT was not 0, probably working with a remote execution server
 if PORT != 0:
 # To allow reconnection within the 2MSL wait (cf. Stevens TCP
 # V1, 18.6), set SO_REUSEADDR. Note that this can be problematic
 # on Windows since the implementation allows two active sockets on
 # the same address!
 self.rpcclt.listening_sock.setsockopt(socket.SOL_SOCKET,
 socket.SO_REUSEADDR, 1)
 self.spawn_subprocess()
 #time.sleep(20) # test to simulate GUI not accepting connection
 # Accept the connection from the Python execution server
 self.rpcclt.listening_sock.settimeout(10)
 try:
 self.rpcclt.accept()
 except socket.timeout:
 self.display_no_subprocess_error()
 return None
 self.rpcclt.register("console", self.tkconsole)
 self.rpcclt.register("stdin", self.tkconsole.stdin)
 self.rpcclt.register("stdout", self.tkconsole.stdout)
 self.rpcclt.register("stderr", self.tkconsole.stderr)
 self.rpcclt.register("flist", self.tkconsole.flist)
 self.rpcclt.register("linecache", linecache)
 self.rpcclt.register("interp", self)
 self.transfer_path(with_cwd=True)
 self.poll_subprocess()
 return self.rpcclt

 def restart_subprocess(self, with_cwd=False, filename=''):
 if self.restarting:
 return self.rpcclt
 self.restarting = True
 # close only the subprocess debugger
 debug = self.getdebugger()
 if debug:
 try:
 # Only close subprocess debugger, don't unregister gui_adap!
 debugger_r.close_subprocess_debugger(self.rpcclt)
 except:
 pass
 # Kill subprocess, spawn a new one, accept connection.
 self.rpcclt.close()
 self.terminate_subprocess()
 console = self.tkconsole
 was_executing = console.executing
 console.executing = False
 self.spawn_subprocess()
 try:
 self.rpcclt.accept()
 except socket.timeout:
 self.display_no_subprocess_error()
 return None
 self.transfer_path(with_cwd=with_cwd)
 console.stop_readline()
 # annotate restart in shell window and mark it
 console.text.delete("iomark", "end-1c")
 console.write('\n')
 console.write(restart_line(console.width, filename))
 console.text.mark_set("restart", "end-1c")
 console.text.mark_gravity("restart", "left")
 if not filename:
 console.showprompt()
 # restart subprocess debugger
 if debug:
 # Restarted debugger connects to current instance of debug GUI
 debugger_r.restart_subprocess_debugger(self.rpcclt)
 # reload remote debugger breakpoints for all PyShellEditWindows
 debug.load_breakpoints()
 self.compile.compiler.flags = self.original_compiler_flags
 self.restarting = False
 return self.rpcclt

 def __request_interrupt(self):
 self.rpcclt.remotecall("exec", "interrupt_the_server", (), {})

 def interrupt_subprocess(self):
 threading.Thread(target=self.__request_interrupt).start()

 def kill_subprocess(self):
 if self._afterid is not None:
 self.tkconsole.text.after_cancel(self._afterid)
 try:
 self.rpcclt.listening_sock.close()
 except AttributeError: # no socket
 pass
 try:
 self.rpcclt.close()
 except AttributeError: # no socket
 pass
 self.terminate_subprocess()
 self.tkconsole.executing = False
 self.rpcclt = None

 def terminate_subprocess(self):
 "Make sure subprocess is terminated"
 try:
 self.rpcsubproc.kill()
 except OSError:
 # process already terminated
 return
 else:
 try:
 self.rpcsubproc.wait()
 except OSError:
 return

 def transfer_path(self, with_cwd=False):
 if with_cwd: # Issue 13506
 path = [''] # include Current Working Directory
 path.extend(sys.path)
 else:
 path = sys.path

 self.runcommand("""if 1:
 import sys as _sys
 _sys.path = %r
 del _sys
\n""" % (path,))

 active_seq = None

 def poll_subprocess(self):
 clt = self.rpcclt
 if clt is None:
 return
 try:
 response = clt.pollresponse(self.active_seq, wait=0.05)
 except (EOFError, OSError, KeyboardInterrupt):
 # lost connection or subprocess terminated itself, restart
 # [the KBI is from rpc.SocketIO.handle_EOF()]
 if self.tkconsole.closing:
 return
 response = None
 self.restart_subprocess()
 if response:
 self.tkconsole.resetoutput()
 self.active_seq = None
 how, what = response
 console = self.tkconsole.console
 if how == "OK":
 if what is not None:
 print(repr(what), file=console)
 elif how == "EXCEPTION":
 if self.tkconsole.getvar("<<toggle-jit-stack-viewer>>"):
 self.remote_stack_viewer()
 elif how == "ERROR":
 errmsg = "pyshell.ModifiedInterpreter: Subprocess ERROR:\n"
 print(errmsg, what, file=sys.__stderr__)
 print(errmsg, what, file=console)
 # we received a response to the currently active seq number:
 try:
 self.tkconsole.endexecuting()
 except AttributeError: # shell may have closed
 pass
 # Reschedule myself
 if not self.tkconsole.closing:
 self._afterid = self.tkconsole.text.after(
 self.tkconsole.pollinterval, self.poll_subprocess)

 debugger = None

 def setdebugger(self, debugger):
 self.debugger = debugger

 def getdebugger(self):
 return self.debugger

 def open_remote_stack_viewer(self):
 """Initiate the remote stack viewer from a separate thread.

 This method is called from the subprocess, and by returning from this
 method we allow the subprocess to unblock. After a bit the shell
 requests the subprocess to open the remote stack viewer which returns a
 static object looking at the last exception. It is queried through
 the RPC mechanism.

 """
 self.tkconsole.text.after(300, self.remote_stack_viewer)
 return

 def remote_stack_viewer(self):
 from idlelib import debugobj_r
 oid = self.rpcclt.remotequeue("exec", "stackviewer", ("flist",), {})
 if oid is None:
 self.tkconsole.root.bell()
 return
 item = debugobj_r.StubObjectTreeItem(self.rpcclt, oid)
 from idlelib.tree import ScrolledCanvas, TreeNode
 top = Toplevel(self.tkconsole.root)
 theme = idleConf.CurrentTheme()
 background = idleConf.GetHighlight(theme, 'normal')['background']
 sc = ScrolledCanvas(top, bg=background, highlightthickness=0)
 sc.frame.pack(expand=1, fill="both")
 node = TreeNode(sc.canvas, None, item)
 node.expand()
 # XXX Should GC the remote tree when closing the window

 gid = 0

 def execsource(self, source):
 "Like runsource() but assumes complete exec source"
 filename = self.stuffsource(source)
 self.execfile(filename, source)

 def execfile(self, filename, source=None):
 "Execute an existing file"
 if source is None:
 with tokenize.open(filename) as fp:
 source = fp.read()
 if use_subprocess:
 source = (f"__file__ = r'''{os.path.abspath(filename)}'''\n"
 + source + "\ndel __file__")
 try:
 code = compile(source, filename, "exec")
 except (OverflowError, SyntaxError):
 self.tkconsole.resetoutput()
 print('*** Error in script or command!\n'
 'Traceback (most recent call last):',
 file=self.tkconsole.stderr)
 InteractiveInterpreter.showsyntaxerror(self, filename)
 self.tkconsole.showprompt()
 else:
 self.runcode(code)

 def runsource(self, source):
 "Extend base class method: Stuff the source in the line cache first"
 filename = self.stuffsource(source)
 self.more = 0
 # at the moment, InteractiveInterpreter expects str
 assert isinstance(source, str)
 # InteractiveInterpreter.runsource() calls its runcode() method,
 # which is overridden (see below)
 return InteractiveInterpreter.runsource(self, source, filename)

 def stuffsource(self, source):
 "Stuff source in the filename cache"
 filename = "<pyshell#%d>" % self.gid
 self.gid = self.gid + 1
 lines = source.split("\n")
 linecache.cache[filename] = len(source)+1, 0, lines, filename
 return filename

 def prepend_syspath(self, filename):
 "Prepend sys.path with file's directory if not already included"
 self.runcommand("""if 1:
 _filename = %r
 import sys as _sys
 from os.path import dirname as _dirname
 _dir = _dirname(_filename)
 if not _dir in _sys.path:
 _sys.path.insert(0, _dir)
 del _filename, _sys, _dirname, _dir
\n""" % (filename,))

 def showsyntaxerror(self, filename=None):
 """Override Interactive Interpreter method: Use Colorizing

 Color the offending position instead of printing it and pointing at it
 with a caret.

 """
 tkconsole = self.tkconsole
 text = tkconsole.text
 text.tag_remove("ERROR", "1.0", "end")
 type, value, tb = sys.exc_info()
 msg = getattr(value, 'msg', '') or value or "<no detail available>"
 lineno = getattr(value, 'lineno', '') or 1
 offset = getattr(value, 'offset', '') or 0
 if offset == 0:
 lineno += 1 #mark end of offending line
 if lineno == 1:
 pos = "iomark + %d chars" % (offset-1)
 else:
 pos = "iomark linestart + %d lines + %d chars" % \
 (lineno-1, offset-1)
 tkconsole.colorize_syntax_error(text, pos)
 tkconsole.resetoutput()
 self.write("SyntaxError: %s\n" % msg)
 tkconsole.showprompt()

 def showtraceback(self):
 "Extend base class method to reset output properly"
 self.tkconsole.resetoutput()
 self.checklinecache()
 InteractiveInterpreter.showtraceback(self)
 if self.tkconsole.getvar("<<toggle-jit-stack-viewer>>"):
 self.tkconsole.open_stack_viewer()

 def checklinecache(self):
 c = linecache.cache
 for key in list(c.keys()):
 if key[:1] + key[-1:] != "<>":
 del c[key]

 def runcommand(self, code):
 "Run the code without invoking the debugger"
 # The code better not raise an exception!
 if self.tkconsole.executing:
 self.display_executing_dialog()
 return 0
 if self.rpcclt:
 self.rpcclt.remotequeue("exec", "runcode", (code,), {})
 else:
 exec(code, self.locals)
 return 1

 def runcode(self, code):
 "Override base class method"
 if self.tkconsole.executing:
 self.interp.restart_subprocess()
 self.checklinecache()
 debugger = self.debugger
 try:
 self.tkconsole.beginexecuting()
 if not debugger and self.rpcclt is not None:
 self.active_seq = self.rpcclt.asyncqueue("exec", "runcode",
 (code,), {})
 elif debugger:
 debugger.run(code, self.locals)
 else:
 exec(code, self.locals)
 except SystemExit:
 if not self.tkconsole.closing:
 if tkMessageBox.askyesno(
 "Exit?",
 "Do you want to exit altogether?",
 default="yes",
 parent=self.tkconsole.text):
 raise
 else:
 self.showtraceback()
 else:
 raise
 except:
 if use_subprocess:
 print("IDLE internal error in runcode()",
 file=self.tkconsole.stderr)
 self.showtraceback()
 self.tkconsole.endexecuting()
 else:
 if self.tkconsole.canceled:
 self.tkconsole.canceled = False
 print("KeyboardInterrupt", file=self.tkconsole.stderr)
 else:
 self.showtraceback()
 finally:
 if not use_subprocess:
 try:
 self.tkconsole.endexecuting()
 except AttributeError: # shell may have closed
 pass

 def write(self, s):
 "Override base class method"
 return self.tkconsole.stderr.write(s)

 def display_port_binding_error(self):
 tkMessageBox.showerror(
 "Port Binding Error",
 "IDLE can't bind to a TCP/IP port, which is necessary to "
 "communicate with its Python execution server. This might be "
 "because no networking is installed on this computer. "
 "Run IDLE with the -n command line switch to start without a "
 "subprocess and refer to Help/IDLE Help 'Running without a "
 "subprocess' for further details.",
 parent=self.tkconsole.text)

 def display_no_subprocess_error(self):
 tkMessageBox.showerror(
 "Subprocess Connection Error",
 "IDLE's subprocess didn't make connection.\n"
 "See the 'Startup failure' section of the IDLE doc, online at\n"
 "https://docs.python.org/3/library/idle.html#startup-failure",
 parent=self.tkconsole.text)

 def display_executing_dialog(self):
 tkMessageBox.showerror(
 "Already executing",
 "The Python Shell window is already executing a command; "
 "please wait until it is finished.",
 parent=self.tkconsole.text)


class PyShell(OutputWindow):

 shell_title = "Python " + python_version() + " Shell"

 # Override classes
 ColorDelegator = ModifiedColorDelegator
 UndoDelegator = ModifiedUndoDelegator

 # Override menus
 menu_specs = [
 ("file", "_File"),
 ("edit", "_Edit"),
 ("debug", "_Debug"),
 ("options", "_Options"),
 ("window", "_Window"),
 ("help", "_Help"),
 ]

 # Extend right-click context menu
 rmenu_specs = OutputWindow.rmenu_specs + [
 ("Squeeze", "<<squeeze-current-text>>"),
 ]

 allow_line_numbers = False

 # New classes
 from idlelib.history import History

 def __init__(self, flist=None):
 if use_subprocess:
 ms = self.menu_specs
 if ms[2][0] != "shell":
 ms.insert(2, ("shell", "She_ll"))
 self.interp = ModifiedInterpreter(self)
 if flist is None:
 root = Tk()
 fixwordbreaks(root)
 root.withdraw()
 flist = PyShellFileList(root)

 OutputWindow.__init__(self, flist, None, None)

 self.usetabs = True
 # indentwidth must be 8 when using tabs. See note in EditorWindow:
 self.indentwidth = 8

 self.sys_ps1 = sys.ps1 if hasattr(sys, 'ps1') else '>>> '
 self.prompt_last_line = self.sys_ps1.split('\n')[-1]
 self.prompt = self.sys_ps1 # Changes when debug active

 text = self.text
 text.configure(wrap="char")
 text.bind("<<newline-and-indent>>", self.enter_callback)
 text.bind("<<plain-newline-and-indent>>", self.linefeed_callback)
 text.bind("<<interrupt-execution>>", self.cancel_callback)
 text.bind("<<end-of-file>>", self.eof_callback)
 text.bind("<<open-stack-viewer>>", self.open_stack_viewer)
 text.bind("<<toggle-debugger>>", self.toggle_debugger)
 text.bind("<<toggle-jit-stack-viewer>>", self.toggle_jit_stack_viewer)
 if use_subprocess:
 text.bind("<<view-restart>>", self.view_restart_mark)
 text.bind("<<restart-shell>>", self.restart_shell)
 squeezer = self.Squeezer(self)
 text.bind("<<squeeze-current-text>>",
 squeezer.squeeze_current_text_event)

 self.save_stdout = sys.stdout
 self.save_stderr = sys.stderr
 self.save_stdin = sys.stdin
 from idlelib import iomenu
 self.stdin = StdInputFile(self, "stdin",
 iomenu.encoding, iomenu.errors)
 self.stdout = StdOutputFile(self, "stdout",
 iomenu.encoding, iomenu.errors)
 self.stderr = StdOutputFile(self, "stderr",
 iomenu.encoding, "backslashreplace")
 self.console = StdOutputFile(self, "console",
 iomenu.encoding, iomenu.errors)
 if not use_subprocess:
 sys.stdout = self.stdout
 sys.stderr = self.stderr
 sys.stdin = self.stdin
 try:
 # page help() text to shell.
 import pydoc # import must be done here to capture i/o rebinding.
 # XXX KBK 27Dec07 use text viewer someday, but must work w/o subproc
 pydoc.pager = pydoc.plainpager
 except:
 sys.stderr = sys.__stderr__
 raise
 #
 self.history = self.History(self.text)
 #
 self.pollinterval = 50 # millisec

 def get_standard_extension_names(self):
 return idleConf.GetExtensions(shell_only=True)

 reading = False
 executing = False
 canceled = False
 endoffile = False
 closing = False
 _stop_readline_flag = False

 def set_warning_stream(self, stream):
 global warning_stream
 warning_stream = stream

 def get_warning_stream(self):
 return warning_stream

 def toggle_debugger(self, event=None):
 if self.executing:
 tkMessageBox.showerror("Don't debug now",
 "You can only toggle the debugger when idle",
 parent=self.text)
 self.set_debugger_indicator()
 return "break"
 else:
 db = self.interp.getdebugger()
 if db:
 self.close_debugger()
 else:
 self.open_debugger()

 def set_debugger_indicator(self):
 db = self.interp.getdebugger()
 self.setvar("<<toggle-debugger>>", not not db)

 def toggle_jit_stack_viewer(self, event=None):
 pass # All we need is the variable

 def close_debugger(self):
 db = self.interp.getdebugger()
 if db:
 self.interp.setdebugger(None)
 db.close()
 if self.interp.rpcclt:
 debugger_r.close_remote_debugger(self.interp.rpcclt)
 self.resetoutput()
 self.console.write("[DEBUG OFF]\n")
 self.prompt = self.sys_ps1
 self.showprompt()
 self.set_debugger_indicator()

 def open_debugger(self):
 if self.interp.rpcclt:
 dbg_gui = debugger_r.start_remote_debugger(self.interp.rpcclt,
 self)
 else:
 dbg_gui = debugger.Debugger(self)
 self.interp.setdebugger(dbg_gui)
 dbg_gui.load_breakpoints()
 self.prompt = "[DEBUG ON]\n" + self.sys_ps1
 self.showprompt()
 self.set_debugger_indicator()

 def beginexecuting(self):
 "Helper for ModifiedInterpreter"
 self.resetoutput()
 self.executing = 1

 def endexecuting(self):
 "Helper for ModifiedInterpreter"
 self.executing = 0
 self.canceled = 0
 self.showprompt()

 def close(self):
 "Extend EditorWindow.close()"
 if self.executing:
 response = tkMessageBox.askokcancel(
 "Kill?",
 "Your program is still running!\n Do you want to kill it?",
 default="ok",
 parent=self.text)
 if response is False:
 return "cancel"
 self.stop_readline()
 self.canceled = True
 self.closing = True
 return EditorWindow.close(self)

 def _close(self):
 "Extend EditorWindow._close(), shut down debugger and execution server"
 self.close_debugger()
 if use_subprocess:
 self.interp.kill_subprocess()
 # Restore std streams
 sys.stdout = self.save_stdout
 sys.stderr = self.save_stderr
 sys.stdin = self.save_stdin
 # Break cycles
 self.interp = None
 self.console = None
 self.flist.pyshell = None
 self.history = None
 EditorWindow._close(self)

 def ispythonsource(self, filename):
 "Override EditorWindow method: never remove the colorizer"
 return True

 def short_title(self):
 return self.shell_title

 COPYRIGHT = \
 'Type "help", "copyright", "credits" or "license()" for more information.'

 def begin(self):
 self.text.mark_set("iomark", "insert")
 self.resetoutput()
 if use_subprocess:
 nosub = ''
 client = self.interp.start_subprocess()
 if not client:
 self.close()
 return False
 else:
 nosub = ("==== No Subprocess ====\n\n" +
 "WARNING: Running IDLE without a Subprocess is deprecated\n" +
 "and will be removed in a later version. See Help/IDLE Help\n" +
 "for details.\n\n")
 sys.displayhook = rpc.displayhook

 self.write("Python %s on %s\n%s\n%s" %
 (sys.version, sys.platform, self.COPYRIGHT, nosub))
 self.text.focus_force()
 self.showprompt()
 import tkinter
 tkinter._default_root = None # 03Jan04 KBK What's this?
 return True

 def stop_readline(self):
 if not self.reading: # no nested mainloop to exit.
 return
 self._stop_readline_flag = True
 self.top.quit()

 def readline(self):
 save = self.reading
 try:
 self.reading = 1
 self.top.mainloop() # nested mainloop()
 finally:
 self.reading = save
 if self._stop_readline_flag:
 self._stop_readline_flag = False
 return ""
 line = self.text.get("iomark", "end-1c")
 if len(line) == 0: # may be EOF if we quit our mainloop with Ctrl-C
 line = "\n"
 self.resetoutput()
 if self.canceled:
 self.canceled = 0
 if not use_subprocess:
 raise KeyboardInterrupt
 if self.endoffile:
 self.endoffile = 0
 line = ""
 return line

 def isatty(self):
 return True

 def cancel_callback(self, event=None):
 try:
 if self.text.compare("sel.first", "!=", "sel.last"):
 return # Active selection -- always use default binding
 except:
 pass
 if not (self.executing or self.reading):
 self.resetoutput()
 self.interp.write("KeyboardInterrupt\n")
 self.showprompt()
 return "break"
 self.endoffile = 0
 self.canceled = 1
 if (self.executing and self.interp.rpcclt):
 if self.interp.getdebugger():
 self.interp.restart_subprocess()
 else:
 self.interp.interrupt_subprocess()
 if self.reading:
 self.top.quit() # exit the nested mainloop() in readline()
 return "break"

 def eof_callback(self, event):
 if self.executing and not self.reading:
 return # Let the default binding (delete next char) take over
 if not (self.text.compare("iomark", "==", "insert") and
 self.text.compare("insert", "==", "end-1c")):
 return # Let the default binding (delete next char) take over
 if not self.executing:
 self.resetoutput()
 self.close()
 else:
 self.canceled = 0
 self.endoffile = 1
 self.top.quit()
 return "break"

 def linefeed_callback(self, event):
 # Insert a linefeed without entering anything (still autoindented)
 if self.reading:
 self.text.insert("insert", "\n")
 self.text.see("insert")
 else:
 self.newline_and_indent_event(event)
 return "break"

 def enter_callback(self, event):
 if self.executing and not self.reading:
 return # Let the default binding (insert '\n') take over
 # If some text is selected, recall the selection
 # (but only if this before the I/O mark)
 try:
 sel = self.text.get("sel.first", "sel.last")
 if sel:
 if self.text.compare("sel.last", "<=", "iomark"):
 self.recall(sel, event)
 return "break"
 except:
 pass
 # If we're strictly before the line containing iomark, recall
 # the current line, less a leading prompt, less leading or
 # trailing whitespace
 if self.text.compare("insert", "<", "iomark linestart"):
 # Check if there's a relevant stdin range -- if so, use it
 prev = self.text.tag_prevrange("stdin", "insert")
 if prev and self.text.compare("insert", "<", prev[1]):
 self.recall(self.text.get(prev[0], prev[1]), event)
 return "break"
 next = self.text.tag_nextrange("stdin", "insert")
 if next and self.text.compare("insert lineend", ">=", next[0]):
 self.recall(self.text.get(next[0], next[1]), event)
 return "break"
 # No stdin mark -- just get the current line, less any prompt
 indices = self.text.tag_nextrange("console", "insert linestart")
 if indices and \
 self.text.compare(indices[0], "<=", "insert linestart"):
 self.recall(self.text.get(indices[1], "insert lineend"), event)
 else:
 self.recall(self.text.get("insert linestart", "insert lineend"), event)
 return "break"
 # If we're between the beginning of the line and the iomark, i.e.
 # in the prompt area, move to the end of the prompt
 if self.text.compare("insert", "<", "iomark"):
 self.text.mark_set("insert", "iomark")
 # If we're in the current input and there's only whitespace
 # beyond the cursor, erase that whitespace first
 s = self.text.get("insert", "end-1c")
 if s and not s.strip():
 self.text.delete("insert", "end-1c")
 # If we're in the current input before its last line,
 # insert a newline right at the insert point
 if self.text.compare("insert", "<", "end-1c linestart"):
 self.newline_and_indent_event(event)
 return "break"
 # We're in the last line; append a newline and submit it
 self.text.mark_set("insert", "end-1c")
 if self.reading:
 self.text.insert("insert", "\n")
 self.text.see("insert")
 else:
 self.newline_and_indent_event(event)
 self.text.tag_add("stdin", "iomark", "end-1c")
 self.text.update_idletasks()
 if self.reading:
 self.top.quit() # Break out of recursive mainloop()
 else:
 self.runit()
 return "break"

 def recall(self, s, event):
 # remove leading and trailing empty or whitespace lines
 s = re.sub(r'^\s*\n', '' , s)
 s = re.sub(r'\n\s*$', '', s)
 lines = s.split('\n')
 self.text.undo_block_start()
 try:
 self.text.tag_remove("sel", "1.0", "end")
 self.text.mark_set("insert", "end-1c")
 prefix = self.text.get("insert linestart", "insert")
 if prefix.rstrip().endswith(':'):
 self.newline_and_indent_event(event)
 prefix = self.text.get("insert linestart", "insert")
 self.text.insert("insert", lines[0].strip())
 if len(lines) > 1:
 orig_base_indent = re.search(r'^([ \t]*)', lines[0]).group(0)
 new_base_indent = re.search(r'^([ \t]*)', prefix).group(0)
 for line in lines[1:]:
 if line.startswith(orig_base_indent):
 # replace orig base indentation with new indentation
 line = new_base_indent + line[len(orig_base_indent):]
 self.text.insert('insert', '\n'+line.rstrip())
 finally:
 self.text.see("insert")
 self.text.undo_block_stop()

 def runit(self):
 line = self.text.get("iomark", "end-1c")
 # Strip off last newline and surrounding whitespace.
 # (To allow you to hit return twice to end a statement.)
 i = len(line)
 while i > 0 and line[i-1] in " \t":
 i = i-1
 if i > 0 and line[i-1] == "\n":
 i = i-1
 while i > 0 and line[i-1] in " \t":
 i = i-1
 line = line[:i]
 self.interp.runsource(line)

 def open_stack_viewer(self, event=None):
 if self.interp.rpcclt:
 return self.interp.remote_stack_viewer()
 try:
 sys.last_traceback
 except:
 tkMessageBox.showerror("No stack trace",
 "There is no stack trace yet.\n"
 "(sys.last_traceback is not defined)",
 parent=self.text)
 return
 from idlelib.stackviewer import StackBrowser
 StackBrowser(self.root, self.flist)

 def view_restart_mark(self, event=None):
 self.text.see("iomark")
 self.text.see("restart")

 def restart_shell(self, event=None):
 "Callback for Run/Restart Shell Cntl-F6"
 self.interp.restart_subprocess(with_cwd=True)

 def showprompt(self):
 self.resetoutput()
 self.console.write(self.prompt)
 self.text.mark_set("insert", "end-1c")
 self.set_line_and_column()
 self.io.reset_undo()

 def show_warning(self, msg):
 width = self.interp.tkconsole.width
 wrapper = TextWrapper(width=width, tabsize=8, expand_tabs=True)
 wrapped_msg = '\n'.join(wrapper.wrap(msg))
 if not wrapped_msg.endswith('\n'):
 wrapped_msg += '\n'
 self.per.bottom.insert("iomark linestart", wrapped_msg, "stderr")

 def resetoutput(self):
 source = self.text.get("iomark", "end-1c")
 if self.history:
 self.history.store(source)
 if self.text.get("end-2c") != "\n":
 self.text.insert("end-1c", "\n")
 self.text.mark_set("iomark", "end-1c")
 self.set_line_and_column()

 def write(self, s, tags=()):
 try:
 self.text.mark_gravity("iomark", "right")
 count = OutputWindow.write(self, s, tags, "iomark")
 self.text.mark_gravity("iomark", "left")
 except:
 raise ###pass # ### 11Aug07 KBK if we are expecting exceptions
 # let's find out what they are and be specific.
 if self.canceled:
 self.canceled = 0
 if not use_subprocess:
 raise KeyboardInterrupt
 return count

 def rmenu_check_cut(self):
 try:
 if self.text.compare('sel.first', '<', 'iomark'):
 return 'disabled'
 except TclError: # no selection, so the index 'sel.first' doesn't exist
 return 'disabled'
 return super().rmenu_check_cut()

 def rmenu_check_paste(self):
 if self.text.compare('insert','<','iomark'):
 return 'disabled'
 return super().rmenu_check_paste()


def fix_x11_paste(root):
 "Make paste replace selection on x11. See issue #5124."
 if root._windowingsystem == 'x11':
 for cls in 'Text', 'Entry', 'Spinbox':
 root.bind_class(
 cls,
 '<<Paste>>',
 'catch {%W delete sel.first sel.last}\n' +
 root.bind_class(cls, '<<Paste>>'))


usage_msg = """\

USAGE: idle [-deins] [-t title] [file]*
 idle [-dns] [-t title] (-c cmd | -r file) [arg]*
 idle [-dns] [-t title] - [arg]*

 -h print this help message and exit
 -n run IDLE without a subprocess (DEPRECATED,
 see Help/IDLE Help for details)

The following options will override the IDLE 'settings' configuration:

 -e open an edit window
 -i open a shell window

The following options imply -i and will open a shell:

 -c cmd run the command in a shell, or
 -r file run script from file

 -d enable the debugger
 -s run $IDLESTARTUP or $PYTHONSTARTUP before anything else
 -t title set title of shell window

A default edit window will be bypassed when -c, -r, or - are used.

[arg]* are passed to the command (-c) or script (-r) in sys.argv[1:].

Examples:

idle
 Open an edit window or shell depending on IDLE's configuration.

idle foo.py foobar.py
 Edit the files, also open a shell if configured to start with shell.

idle -est "Baz" foo.py
 Run $IDLESTARTUP or $PYTHONSTARTUP, edit foo.py, and open a shell
 window with the title "Baz".

idle -c "import sys; print(sys.argv)" "foo"
 Open a shell window and run the command, passing "-c" in sys.argv[0]
 and "foo" in sys.argv[1].

idle -d -s -r foo.py "Hello World"
 Open a shell window, run a startup script, enable the debugger, and
 run foo.py, passing "foo.py" in sys.argv[0] and "Hello World" in
 sys.argv[1].

echo "import sys; print(sys.argv)" | idle - "foobar"
 Open a shell window, run the script piped in, passing '' in sys.argv[0]
 and "foobar" in sys.argv[1].
"""

def main():
 import getopt
 from platform import system
 from idlelib import testing # bool value
 from idlelib import macosx

 global flist, root, use_subprocess

 capture_warnings(True)
 use_subprocess = True
 enable_shell = False
 enable_edit = False
 debug = False
 cmd = None
 script = None
 startup = False
 try:
 opts, args = getopt.getopt(sys.argv[1:], "c:deihnr:st:")
 except getopt.error as msg:
 print("Error: %s\n%s" % (msg, usage_msg), file=sys.stderr)
 sys.exit(2)
 for o, a in opts:
 if o == '-c':
 cmd = a
 enable_shell = True
 if o == '-d':
 debug = True
 enable_shell = True
 if o == '-e':
 enable_edit = True
 if o == '-h':
 sys.stdout.write(usage_msg)
 sys.exit()
 if o == '-i':
 enable_shell = True
 if o == '-n':
 print(" Warning: running IDLE without a subprocess is deprecated.",
 file=sys.stderr)
 use_subprocess = False
 if o == '-r':
 script = a
 if os.path.isfile(script):
 pass
 else:
 print("No script file: ", script)
 sys.exit()
 enable_shell = True
 if o == '-s':
 startup = True
 enable_shell = True
 if o == '-t':
 PyShell.shell_title = a
 enable_shell = True
 if args and args[0] == '-':
 cmd = sys.stdin.read()
 enable_shell = True
 # process sys.argv and sys.path:
 for i in range(len(sys.path)):
 sys.path[i] = os.path.abspath(sys.path[i])
 if args and args[0] == '-':
 sys.argv = [''] + args[1:]
 elif cmd:
 sys.argv = ['-c'] + args
 elif script:
 sys.argv = [script] + args
 elif args:
 enable_edit = True
 pathx = []
 for filename in args:
 pathx.append(os.path.dirname(filename))
 for dir in pathx:
 dir = os.path.abspath(dir)
 if not dir in sys.path:
 sys.path.insert(0, dir)
 else:
 dir = os.getcwd()
 if dir not in sys.path:
 sys.path.insert(0, dir)
 # check the IDLE settings configuration (but command line overrides)
 edit_start = idleConf.GetOption('main', 'General',
 'editor-on-startup', type='bool')
 enable_edit = enable_edit or edit_start
 enable_shell = enable_shell or not enable_edit

 # Setup root. Don't break user code run in IDLE process.
 # Don't change environment when testing.
 if use_subprocess and not testing:
 NoDefaultRoot()
 root = Tk(className="Idle")
 root.withdraw()
 from idlelib.run import fix_scaling
 fix_scaling(root)

 # set application icon
 icondir = os.path.join(os.path.dirname(__file__), 'Icons')
 if system() == 'Windows':
 iconfile = os.path.join(icondir, 'idle.ico')
 root.wm_iconbitmap(default=iconfile)
 elif not macosx.isAquaTk():
 ext = '.png' if TkVersion >= 8.6 else '.gif'
 iconfiles = [os.path.join(icondir, 'idle_%d%s' % (size, ext))
 for size in (16, 32, 48)]
 icons = [PhotoImage(master=root, file=iconfile)
 for iconfile in iconfiles]
 root.wm_iconphoto(True, *icons)

 # start editor and/or shell windows:
 fixwordbreaks(root)
 fix_x11_paste(root)
 flist = PyShellFileList(root)
 macosx.setupApp(root, flist)

 if enable_edit:
 if not (cmd or script):
 for filename in args[:]:
 if flist.open(filename) is None:
 # filename is a directory actually, disconsider it
 args.remove(filename)
 if not args:
 flist.new()

 if enable_shell:
 shell = flist.open_shell()
 if not shell:
 return # couldn't open shell
 if macosx.isAquaTk() and flist.dict:
 # On OSX: when the user has double-clicked on a file that causes
 # IDLE to be launched the shell window will open just in front of
 # the file she wants to see. Lower the interpreter window when
 # there are open files.
 shell.top.lower()
 else:
 shell = flist.pyshell

 # Handle remaining options. If any of these are set, enable_shell
 # was set also, so shell must be true to reach here.
 if debug:
 shell.open_debugger()
 if startup:
 filename = os.environ.get("IDLESTARTUP") or \
 os.environ.get("PYTHONSTARTUP")
 if filename and os.path.isfile(filename):
 shell.interp.execfile(filename)
 if cmd or script:
 shell.interp.runcommand("""if 1:
 import sys as _sys
 _sys.argv = %r
 del _sys
\n""" % (sys.argv,))
 if cmd:
 shell.interp.execsource(cmd)
 elif script:
 shell.interp.prepend_syspath(script)
 shell.interp.execfile(script)
 elif shell:
 # If there is a shell window and no cmd or script in progress,
 # check for problematic issues and print warning message(s) in
 # the IDLE shell window; this is less intrusive than always
 # opening a separate window.

 # Warn if using a problematic OS X Tk version.
 tkversionwarning = macosx.tkVersionWarning(root)
 if tkversionwarning:
 shell.show_warning(tkversionwarning)

 # Warn if the "Prefer tabs when opening documents" system
 # preference is set to "Always".
 prefer_tabs_preference_warning = macosx.preferTabsPreferenceWarning()
 if prefer_tabs_preference_warning:
 shell.show_warning(prefer_tabs_preference_warning)

 while flist.inversedict: # keep IDLE running while files are open.
 root.mainloop()
 root.destroy()
 capture_warnings(False)

if __name__ == "__main__":
 main()

capture_warnings(False) # Make sure turned off; see issue 18081