""" idlelib.run

Simplified, pyshell.ModifiedInterpreter spawns a subprocess with
f'''{sys.executable} -c "__import__('idlelib.run').run.main()"'''
'.run' is needed because __import__ returns idlelib, not idlelib.run.
"""
import io
import linecache
import queue
import sys
import time
import traceback
import _thread as thread
import threading
import warnings

from idlelib import autocomplete # AutoComplete, fetch_encodings
from idlelib import calltip # Calltip
from idlelib import debugger_r # start_debugger
from idlelib import debugobj_r # remote_object_tree_item
from idlelib import iomenu # encoding
from idlelib import rpc # multiple objects
from idlelib import stackviewer # StackTreeItem
import __main__

import tkinter # Use tcl and, if startup fails, messagebox.
if not hasattr(sys.modules['idlelib.run'], 'firstrun'):
 # Undo modifications of tkinter by idlelib imports; see bpo-25507.
 for mod in ('simpledialog', 'messagebox', 'font',
 'dialog', 'filedialog', 'commondialog',
 'ttk'):
 delattr(tkinter, mod)
 del sys.modules['tkinter.' + mod]
 # Avoid AttributeError if run again; see bpo-37038.
 sys.modules['idlelib.run'].firstrun = False

LOCALHOST = '127.0.0.1'


def idle_formatwarning(message, category, filename, lineno, line=None):
 """Format warnings the IDLE way."""

 s = "\nWarning (from warnings module):\n"
 s += ' File \"%s\", line %s\n' % (filename, lineno)
 if line is None:
 line = linecache.getline(filename, lineno)
 line = line.strip()
 if line:
 s += " %s\n" % line
 s += "%s: %s\n" % (category.__name__, message)
 return s

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

 The only difference is the formatter called.
 """
 if file is None:
 file = sys.stderr
 try:
 file.write(idle_formatwarning(
 message, category, filename, lineno, line))
 except OSError:
 pass # the file (probably stderr) is invalid - this warning gets lost.

_warnings_showwarning = None

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

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

capture_warnings(True)
tcl = tkinter.Tcl()

def handle_tk_events(tcl=tcl):
 """Process any tk events that are ready to be dispatched if tkinter
 has been imported, a tcl interpreter has been created and tk has been
 loaded."""
 tcl.eval("update")

# Thread shared globals: Establish a queue between a subthread (which handles
# the socket) and the main thread (which runs user code), plus global
# completion, exit and interruptable (the main thread) flags:

exit_now = False
quitting = False
interruptable = False

def main(del_exitfunc=False):
 """Start the Python execution server in a subprocess

 In the Python subprocess, RPCServer is instantiated with handlerclass
 MyHandler, which inherits register/unregister methods from RPCHandler via
 the mix-in class SocketIO.

 When the RPCServer 'server' is instantiated, the TCPServer initialization
 creates an instance of run.MyHandler and calls its handle() method.
 handle() instantiates a run.Executive object, passing it a reference to the
 MyHandler object. That reference is saved as attribute rpchandler of the
 Executive instance. The Executive methods have access to the reference and
 can pass it on to entities that they command
 (e.g. debugger_r.Debugger.start_debugger()). The latter, in turn, can
 call MyHandler(SocketIO) register/unregister methods via the reference to
 register and unregister themselves.

 """
 global exit_now
 global quitting
 global no_exitfunc
 no_exitfunc = del_exitfunc
 #time.sleep(15) # test subprocess not responding
 try:
 assert(len(sys.argv) > 1)
 port = int(sys.argv[-1])
 except:
 print("IDLE Subprocess: no IP port passed in sys.argv.",
 file=sys.__stderr__)
 return

 capture_warnings(True)
 sys.argv[:] = [""]
 sockthread = threading.Thread(target=manage_socket,
 name='SockThread',
 args=((LOCALHOST, port),))
 sockthread.daemon = True
 sockthread.start()
 while 1:
 try:
 if exit_now:
 try:
 exit()
 except KeyboardInterrupt:
 # exiting but got an extra KBI? Try again!
 continue
 try:
 request = rpc.request_queue.get(block=True, timeout=0.05)
 except queue.Empty:
 request = None
 # Issue 32207: calling handle_tk_events here adds spurious
 # queue.Empty traceback to event handling exceptions.
 if request:
 seq, (method, args, kwargs) = request
 ret = method(*args, **kwargs)
 rpc.response_queue.put((seq, ret))
 else:
 handle_tk_events()
 except KeyboardInterrupt:
 if quitting:
 exit_now = True
 continue
 except SystemExit:
 capture_warnings(False)
 raise
 except:
 type, value, tb = sys.exc_info()
 try:
 print_exception()
 rpc.response_queue.put((seq, None))
 except:
 # Link didn't work, print same exception to __stderr__
 traceback.print_exception(type, value, tb, file=sys.__stderr__)
 exit()
 else:
 continue

def manage_socket(address):
 for i in range(3):
 time.sleep(i)
 try:
 server = MyRPCServer(address, MyHandler)
 break
 except OSError as err:
 print("IDLE Subprocess: OSError: " + err.args[1] +
 ", retrying....", file=sys.__stderr__)
 socket_error = err
 else:
 print("IDLE Subprocess: Connection to "
 "IDLE GUI failed, exiting.", file=sys.__stderr__)
 show_socket_error(socket_error, address)
 global exit_now
 exit_now = True
 return
 server.handle_request() # A single request only

def show_socket_error(err, address):
 "Display socket error from manage_socket."
 import tkinter
 from tkinter.messagebox import showerror
 root = tkinter.Tk()
 fix_scaling(root)
 root.withdraw()
 showerror(
 "Subprocess Connection Error",
 f"IDLE's subprocess can't connect to {address[0]}:{address[1]}.\n"
 f"Fatal OSError #{err.errno}: {err.strerror}.\n"
 "See the 'Startup failure' section of the IDLE doc, online at\n"
 "https://docs.python.org/3/library/idle.html#startup-failure",
 parent=root)
 root.destroy()

def print_exception():
 import linecache
 linecache.checkcache()
 flush_stdout()
 efile = sys.stderr
 typ, val, tb = excinfo = sys.exc_info()
 sys.last_type, sys.last_value, sys.last_traceback = excinfo
 seen = set()

 def print_exc(typ, exc, tb):
 seen.add(id(exc))
 context = exc.__context__
 cause = exc.__cause__
 if cause is not None and id(cause) not in seen:
 print_exc(type(cause), cause, cause.__traceback__)
 print("\nThe above exception was the direct cause "
 "of the following exception:\n", file=efile)
 elif (context is not None and
 not exc.__suppress_context__ and
 id(context) not in seen):
 print_exc(type(context), context, context.__traceback__)
 print("\nDuring handling of the above exception, "
 "another exception occurred:\n", file=efile)
 if tb:
 tbe = traceback.extract_tb(tb)
 print('Traceback (most recent call last):', file=efile)
 exclude = ("run.py", "rpc.py", "threading.py", "queue.py",
 "debugger_r.py", "bdb.py")
 cleanup_traceback(tbe, exclude)
 traceback.print_list(tbe, file=efile)
 lines = traceback.format_exception_only(typ, exc)
 for line in lines:
 print(line, end='', file=efile)

 print_exc(typ, val, tb)

def cleanup_traceback(tb, exclude):
 "Remove excluded traces from beginning/end of tb; get cached lines"
 orig_tb = tb[:]
 while tb:
 for rpcfile in exclude:
 if tb[0][0].count(rpcfile):
 break # found an exclude, break for: and delete tb[0]
 else:
 break # no excludes, have left RPC code, break while:
 del tb[0]
 while tb:
 for rpcfile in exclude:
 if tb[-1][0].count(rpcfile):
 break
 else:
 break
 del tb[-1]
 if len(tb) == 0:
 # exception was in IDLE internals, don't prune!
 tb[:] = orig_tb[:]
 print("** IDLE Internal Exception: ", file=sys.stderr)
 rpchandler = rpc.objecttable['exec'].rpchandler
 for i in range(len(tb)):
 fn, ln, nm, line = tb[i]
 if nm == '?':
 nm = "-toplevel-"
 if not line and fn.startswith("<pyshell#"):
 line = rpchandler.remotecall('linecache', 'getline',
 (fn, ln), {})
 tb[i] = fn, ln, nm, line

def flush_stdout():
 """XXX How to do this now?"""

def exit():
 """Exit subprocess, possibly after first clearing exit functions.

 If config-main.cfg/.def 'General' 'delete-exitfunc' is True, then any
 functions registered with atexit will be removed before exiting.
 (VPython support)

 """
 if no_exitfunc:
 import atexit
 atexit._clear()
 capture_warnings(False)
 sys.exit(0)


def fix_scaling(root):
 """Scale fonts on HiDPI displays."""
 import tkinter.font
 scaling = float(root.tk.call('tk', 'scaling'))
 if scaling > 1.4:
 for name in tkinter.font.names(root):
 font = tkinter.font.Font(root=root, name=name, exists=True)
 size = int(font['size'])
 if size < 0:
 font['size'] = round(-0.75*size)


class MyRPCServer(rpc.RPCServer):

 def handle_error(self, request, client_address):
 """Override RPCServer method for IDLE

 Interrupt the MainThread and exit server if link is dropped.

 """
 global quitting
 try:
 raise
 except SystemExit:
 raise
 except EOFError:
 global exit_now
 exit_now = True
 thread.interrupt_main()
 except:
 erf = sys.__stderr__
 print('\n' + '-'*40, file=erf)
 print('Unhandled server exception!', file=erf)
 print('Thread: %s' % threading.current_thread().name, file=erf)
 print('Client Address: ', client_address, file=erf)
 print('Request: ', repr(request), file=erf)
 traceback.print_exc(file=erf)
 print('\n*** Unrecoverable, server exiting!', file=erf)
 print('-'*40, file=erf)
 quitting = True
 thread.interrupt_main()


# Pseudofiles for shell-remote communication (also used in pyshell)

class PseudoFile(io.TextIOBase):

 def __init__(self, shell, tags, encoding=None):
 self.shell = shell
 self.tags = tags
 self._encoding = encoding

 @property
 def encoding(self):
 return self._encoding

 @property
 def name(self):
 return '<%s>' % self.tags

 def isatty(self):
 return True


class PseudoOutputFile(PseudoFile):

 def writable(self):
 return True

 def write(self, s):
 if self.closed:
 raise ValueError("write to closed file")
 if type(s) is not str:
 if not isinstance(s, str):
 raise TypeError('must be str, not ' + type(s).__name__)
 # See issue #19481
 s = str.__str__(s)
 return self.shell.write(s, self.tags)


class PseudoInputFile(PseudoFile):

 def __init__(self, shell, tags, encoding=None):
 PseudoFile.__init__(self, shell, tags, encoding)
 self._line_buffer = ''

 def readable(self):
 return True

 def read(self, size=-1):
 if self.closed:
 raise ValueError("read from closed file")
 if size is None:
 size = -1
 elif not isinstance(size, int):
 raise TypeError('must be int, not ' + type(size).__name__)
 result = self._line_buffer
 self._line_buffer = ''
 if size < 0:
 while True:
 line = self.shell.readline()
 if not line: break
 result += line
 else:
 while len(result) < size:
 line = self.shell.readline()
 if not line: break
 result += line
 self._line_buffer = result[size:]
 result = result[:size]
 return result

 def readline(self, size=-1):
 if self.closed:
 raise ValueError("read from closed file")
 if size is None:
 size = -1
 elif not isinstance(size, int):
 raise TypeError('must be int, not ' + type(size).__name__)
 line = self._line_buffer or self.shell.readline()
 if size < 0:
 size = len(line)
 eol = line.find('\n', 0, size)
 if eol >= 0:
 size = eol + 1
 self._line_buffer = line[size:]
 return line[:size]

 def close(self):
 self.shell.close()


class MyHandler(rpc.RPCHandler):

 def handle(self):
 """Override base method"""
 executive = Executive(self)
 self.register("exec", executive)
 self.console = self.get_remote_proxy("console")
 sys.stdin = PseudoInputFile(self.console, "stdin",
 iomenu.encoding)
 sys.stdout = PseudoOutputFile(self.console, "stdout",
 iomenu.encoding)
 sys.stderr = PseudoOutputFile(self.console, "stderr",
 iomenu.encoding)

 sys.displayhook = rpc.displayhook
 # page help() text to shell.
 import pydoc # import must be done here to capture i/o binding
 pydoc.pager = pydoc.plainpager

 # Keep a reference to stdin so that it won't try to exit IDLE if
 # sys.stdin gets changed from within IDLE's shell. See issue17838.
 self._keep_stdin = sys.stdin

 self.interp = self.get_remote_proxy("interp")
 rpc.RPCHandler.getresponse(self, myseq=None, wait=0.05)

 def exithook(self):
 "override SocketIO method - wait for MainThread to shut us down"
 time.sleep(10)

 def EOFhook(self):
 "Override SocketIO method - terminate wait on callback and exit thread"
 global quitting
 quitting = True
 thread.interrupt_main()

 def decode_interrupthook(self):
 "interrupt awakened thread"
 global quitting
 quitting = True
 thread.interrupt_main()


class Executive(object):

 def __init__(self, rpchandler):
 self.rpchandler = rpchandler
 self.locals = __main__.__dict__
 self.calltip = calltip.Calltip()
 self.autocomplete = autocomplete.AutoComplete()

 def runcode(self, code):
 global interruptable
 try:
 self.usr_exc_info = None
 interruptable = True
 try:
 exec(code, self.locals)
 finally:
 interruptable = False
 except SystemExit as e:
 if e.args: # SystemExit called with an argument.
 ob = e.args[0]
 if not isinstance(ob, (type(None), int)):
 print('SystemExit: ' + str(ob), file=sys.stderr)
 # Return to the interactive prompt.
 except:
 self.usr_exc_info = sys.exc_info()
 if quitting:
 exit()
 print_exception()
 jit = self.rpchandler.console.getvar("<<toggle-jit-stack-viewer>>")
 if jit:
 self.rpchandler.interp.open_remote_stack_viewer()
 else:
 flush_stdout()

 def interrupt_the_server(self):
 if interruptable:
 thread.interrupt_main()

 def start_the_debugger(self, gui_adap_oid):
 return debugger_r.start_debugger(self.rpchandler, gui_adap_oid)

 def stop_the_debugger(self, idb_adap_oid):
 "Unregister the Idb Adapter. Link objects and Idb then subject to GC"
 self.rpchandler.unregister(idb_adap_oid)

 def get_the_calltip(self, name):
 return self.calltip.fetch_tip(name)

 def get_the_completion_list(self, what, mode):
 return self.autocomplete.fetch_completions(what, mode)

 def stackviewer(self, flist_oid=None):
 if self.usr_exc_info:
 typ, val, tb = self.usr_exc_info
 else:
 return None
 flist = None
 if flist_oid is not None:
 flist = self.rpchandler.get_remote_proxy(flist_oid)
 while tb and tb.tb_frame.f_globals["__name__"] in ["rpc", "run"]:
 tb = tb.tb_next
 sys.last_type = typ
 sys.last_value = val
 item = stackviewer.StackTreeItem(flist, tb)
 return debugobj_r.remote_object_tree_item(item)


if __name__ == '__main__':
 from unittest import main
 main('idlelib.idle_test.test_run', verbosity=2)

capture_warnings(False) # Make sure turned off; see bpo-18081.