|
|
#!/usr/bin/env python
|
|
|
# encoding: utf-8
|
|
|
"""
|
|
|
A context manager for managing things injected into :mod:`__builtin__`.
|
|
|
|
|
|
Authors:
|
|
|
|
|
|
* Brian Granger
|
|
|
"""
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Copyright (C) 2008-2009 The IPython Development Team
|
|
|
#
|
|
|
# Distributed under the terms of the BSD License. The full license is in
|
|
|
# the file COPYING, distributed as part of this software.
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Imports
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
import __builtin__
|
|
|
|
|
|
from IPython.core.component import Component
|
|
|
from IPython.core.quitter import Quitter
|
|
|
|
|
|
from IPython.utils.autoattr import auto_attr
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Classes and functions
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
class BuiltinUndefined(object): pass
|
|
|
BuiltinUndefined = BuiltinUndefined()
|
|
|
|
|
|
|
|
|
class BuiltinTrap(Component):
|
|
|
|
|
|
def __init__(self, parent):
|
|
|
super(BuiltinTrap, self).__init__(parent, None, None)
|
|
|
self._orig_builtins = {}
|
|
|
# We define this to track if a single BuiltinTrap is nested.
|
|
|
# Only turn off the trap when the outermost call to __exit__ is made.
|
|
|
self._nested_level = 0
|
|
|
|
|
|
@auto_attr
|
|
|
def shell(self):
|
|
|
return Component.get_instances(
|
|
|
root=self.root,
|
|
|
klass='IPython.core.iplib.InteractiveShell')[0]
|
|
|
|
|
|
def __enter__(self):
|
|
|
if self._nested_level == 0:
|
|
|
self.set()
|
|
|
self._nested_level += 1
|
|
|
# I return self, so callers can use add_builtin in a with clause.
|
|
|
return self
|
|
|
|
|
|
def __exit__(self, type, value, traceback):
|
|
|
if self._nested_level == 1:
|
|
|
self.unset()
|
|
|
self._nested_level -= 1
|
|
|
# Returning False will cause exceptions to propagate
|
|
|
return False
|
|
|
|
|
|
def add_builtin(self, key, value):
|
|
|
"""Add a builtin and save the original."""
|
|
|
orig = __builtin__.__dict__.get(key, BuiltinUndefined)
|
|
|
self._orig_builtins[key] = orig
|
|
|
__builtin__.__dict__[key] = value
|
|
|
|
|
|
def remove_builtin(self, key):
|
|
|
"""Remove an added builtin and re-set the original."""
|
|
|
try:
|
|
|
orig = self._orig_builtins.pop(key)
|
|
|
except KeyError:
|
|
|
pass
|
|
|
else:
|
|
|
if orig is BuiltinUndefined:
|
|
|
del __builtin__.__dict__[key]
|
|
|
else:
|
|
|
__builtin__.__dict__[key] = orig
|
|
|
|
|
|
def set(self):
|
|
|
"""Store ipython references in the __builtin__ namespace."""
|
|
|
self.add_builtin('exit', Quitter(self.shell, 'exit'))
|
|
|
self.add_builtin('quit', Quitter(self.shell, 'quit'))
|
|
|
self.add_builtin('get_ipython', self.shell.get_ipython)
|
|
|
|
|
|
# Recursive reload function
|
|
|
try:
|
|
|
from IPython.lib import deepreload
|
|
|
if self.shell.deep_reload:
|
|
|
self.add_builtin('reload', deepreload.reload)
|
|
|
else:
|
|
|
self.add_builtin('dreload', deepreload.reload)
|
|
|
del deepreload
|
|
|
except ImportError:
|
|
|
pass
|
|
|
|
|
|
# Keep in the builtins a flag for when IPython is active. We set it
|
|
|
# with setdefault so that multiple nested IPythons don't clobber one
|
|
|
# another. Each will increase its value by one upon being activated,
|
|
|
# which also gives us a way to determine the nesting level.
|
|
|
__builtin__.__dict__.setdefault('__IPYTHON__active',0)
|
|
|
|
|
|
def unset(self):
|
|
|
"""Remove any builtins which might have been added by add_builtins, or
|
|
|
restore overwritten ones to their previous values."""
|
|
|
for key in self._orig_builtins.keys():
|
|
|
self.remove_builtin(key)
|
|
|
self._orig_builtins.clear()
|
|
|
self._builtins_added = False
|
|
|
try:
|
|
|
del __builtin__.__dict__['__IPYTHON__active']
|
|
|
except KeyError:
|
|
|
pass
|
|
|
|
