|
|
"""
|
|
|
A context manager for managing things injected into :mod:`__builtin__`.
|
|
|
|
|
|
Authors:
|
|
|
|
|
|
* Brian Granger
|
|
|
* Fernando Perez
|
|
|
"""
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Copyright (C) 2010-2011 The IPython Development Team.
|
|
|
#
|
|
|
# Distributed under the terms of the BSD License.
|
|
|
#
|
|
|
# Complete license in the file COPYING.txt, distributed with this software.
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Imports
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
import __builtin__
|
|
|
|
|
|
from IPython.config.configurable import Configurable
|
|
|
|
|
|
from IPython.utils.traitlets import Instance
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Classes and functions
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
class __BuiltinUndefined(object): pass
|
|
|
BuiltinUndefined = __BuiltinUndefined()
|
|
|
|
|
|
class __HideBuiltin(object): pass
|
|
|
HideBuiltin = __HideBuiltin()
|
|
|
|
|
|
|
|
|
class BuiltinTrap(Configurable):
|
|
|
|
|
|
shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
|
|
|
|
|
|
def __init__(self, shell=None):
|
|
|
super(BuiltinTrap, self).__init__(shell=shell, config=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
|
|
|
self.shell = shell
|
|
|
# builtins we always add - if set to HideBuiltin, they will just
|
|
|
# be removed instead of being replaced by something else
|
|
|
self.auto_builtins = {'exit': HideBuiltin,
|
|
|
'quit': HideBuiltin,
|
|
|
'get_ipython': self.shell.get_ipython,
|
|
|
}
|
|
|
# Recursive reload function
|
|
|
try:
|
|
|
from IPython.lib import deepreload
|
|
|
if self.shell.deep_reload:
|
|
|
self.auto_builtins['reload'] = deepreload.reload
|
|
|
else:
|
|
|
self.auto_builtins['dreload']= deepreload.reload
|
|
|
except ImportError:
|
|
|
pass
|
|
|
|
|
|
def __enter__(self):
|
|
|
if self._nested_level == 0:
|
|
|
self.activate()
|
|
|
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.deactivate()
|
|
|
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."""
|
|
|
bdict = __builtin__.__dict__
|
|
|
orig = bdict.get(key, BuiltinUndefined)
|
|
|
if value is HideBuiltin:
|
|
|
if orig is not BuiltinUndefined: #same as 'key in bdict'
|
|
|
self._orig_builtins[key] = orig
|
|
|
del bdict[key]
|
|
|
else:
|
|
|
self._orig_builtins[key] = orig
|
|
|
bdict[key] = value
|
|
|
|
|
|
def remove_builtin(self, key, orig):
|
|
|
"""Remove an added builtin and re-set the original."""
|
|
|
if orig is BuiltinUndefined:
|
|
|
del __builtin__.__dict__[key]
|
|
|
else:
|
|
|
__builtin__.__dict__[key] = orig
|
|
|
|
|
|
def activate(self):
|
|
|
"""Store ipython references in the __builtin__ namespace."""
|
|
|
|
|
|
add_builtin = self.add_builtin
|
|
|
for name, func in self.auto_builtins.iteritems():
|
|
|
add_builtin(name, func)
|
|
|
|
|
|
def deactivate(self):
|
|
|
"""Remove any builtins which might have been added by add_builtins, or
|
|
|
restore overwritten ones to their previous values."""
|
|
|
remove_builtin = self.remove_builtin
|
|
|
for key, val in self._orig_builtins.iteritems():
|
|
|
remove_builtin(key, val)
|
|
|
self._orig_builtins.clear()
|
|
|
self._builtins_added = False
|
|
|
|
