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# -*- coding: utf-8 -*-
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"""
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Provides a reload() function that acts recursively.
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Python's normal :func:`python:reload` function only reloads the module that it's
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passed. The :func:`reload` function in this module also reloads everything
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imported from that module, which is useful when you're changing files deep
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inside a package.
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To use this as your default reload function, type this for Python 2::
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import __builtin__
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from IPython.lib import deepreload
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__builtin__.reload = deepreload.reload
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Or this for Python 3::
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import builtins
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from IPython.lib import deepreload
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builtins.reload = deepreload.reload
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A reference to the original :func:`python:reload` is stored in this module as
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:data:`original_reload`, so you can restore it later.
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This code is almost entirely based on knee.py, which is a Python
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re-implementation of hierarchical module import.
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"""
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from __future__ import print_function
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#*****************************************************************************
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# Copyright (C) 2001 Nathaniel Gray <n8gray@caltech.edu>
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#*****************************************************************************
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from contextlib import contextmanager
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import imp
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import sys
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from types import ModuleType
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from warnings import warn
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from IPython.utils.py3compat import builtin_mod, builtin_mod_name
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original_import = builtin_mod.__import__
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@contextmanager
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def replace_import_hook(new_import):
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saved_import = builtin_mod.__import__
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builtin_mod.__import__ = new_import
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try:
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yield
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finally:
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builtin_mod.__import__ = saved_import
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def get_parent(globals, level):
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"""
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parent, name = get_parent(globals, level)
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Return the package that an import is being performed in. If globals comes
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from the module foo.bar.bat (not itself a package), this returns the
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sys.modules entry for foo.bar. If globals is from a package's __init__.py,
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the package's entry in sys.modules is returned.
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If globals doesn't come from a package or a module in a package, or a
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corresponding entry is not found in sys.modules, None is returned.
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"""
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orig_level = level
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if not level or not isinstance(globals, dict):
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return None, ''
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pkgname = globals.get('__package__', None)
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if pkgname is not None:
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# __package__ is set, so use it
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if not hasattr(pkgname, 'rindex'):
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raise ValueError('__package__ set to non-string')
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if len(pkgname) == 0:
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if level > 0:
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raise ValueError('Attempted relative import in non-package')
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return None, ''
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name = pkgname
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else:
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# __package__ not set, so figure it out and set it
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if '__name__' not in globals:
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return None, ''
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modname = globals['__name__']
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if '__path__' in globals:
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# __path__ is set, so modname is already the package name
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globals['__package__'] = name = modname
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else:
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# Normal module, so work out the package name if any
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lastdot = modname.rfind('.')
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if lastdot < 0 and level > 0:
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raise ValueError("Attempted relative import in non-package")
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if lastdot < 0:
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globals['__package__'] = None
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return None, ''
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globals['__package__'] = name = modname[:lastdot]
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dot = len(name)
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for x in range(level, 1, -1):
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try:
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dot = name.rindex('.', 0, dot)
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except ValueError:
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raise ValueError("attempted relative import beyond top-level "
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"package")
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name = name[:dot]
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try:
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parent = sys.modules[name]
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except:
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if orig_level < 1:
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warn("Parent module '%.200s' not found while handling absolute "
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"import" % name)
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parent = None
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else:
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raise SystemError("Parent module '%.200s' not loaded, cannot "
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"perform relative import" % name)
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# We expect, but can't guarantee, if parent != None, that:
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# - parent.__name__ == name
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# - parent.__dict__ is globals
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# If this is violated... Who cares?
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return parent, name
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def load_next(mod, altmod, name, buf):
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"""
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mod, name, buf = load_next(mod, altmod, name, buf)
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altmod is either None or same as mod
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"""
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if len(name) == 0:
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# completely empty module name should only happen in
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# 'from . import' (or '__import__("")')
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return mod, None, buf
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dot = name.find('.')
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if dot == 0:
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raise ValueError('Empty module name')
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if dot < 0:
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subname = name
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next = None
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else:
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subname = name[:dot]
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next = name[dot+1:]
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if buf != '':
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buf += '.'
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buf += subname
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result = import_submodule(mod, subname, buf)
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if result is None and mod != altmod:
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result = import_submodule(altmod, subname, subname)
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if result is not None:
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buf = subname
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if result is None:
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raise ImportError("No module named %.200s" % name)
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return result, next, buf
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# Need to keep track of what we've already reloaded to prevent cyclic evil
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found_now = {}
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def import_submodule(mod, subname, fullname):
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"""m = import_submodule(mod, subname, fullname)"""
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# Require:
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# if mod == None: subname == fullname
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# else: mod.__name__ + "." + subname == fullname
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global found_now
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if fullname in found_now and fullname in sys.modules:
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m = sys.modules[fullname]
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else:
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print('Reloading', fullname)
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found_now[fullname] = 1
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oldm = sys.modules.get(fullname, None)
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if mod is None:
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path = None
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elif hasattr(mod, '__path__'):
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path = mod.__path__
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else:
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return None
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try:
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# This appears to be necessary on Python 3, because imp.find_module()
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# tries to import standard libraries (like io) itself, and we don't
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# want them to be processed by our deep_import_hook.
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with replace_import_hook(original_import):
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fp, filename, stuff = imp.find_module(subname, path)
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except ImportError:
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return None
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try:
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m = imp.load_module(fullname, fp, filename, stuff)
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except:
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# load_module probably removed name from modules because of
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# the error. Put back the original module object.
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if oldm:
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sys.modules[fullname] = oldm
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raise
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finally:
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if fp: fp.close()
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add_submodule(mod, m, fullname, subname)
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return m
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def add_submodule(mod, submod, fullname, subname):
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"""mod.{subname} = submod"""
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if mod is None:
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return #Nothing to do here.
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if submod is None:
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submod = sys.modules[fullname]
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setattr(mod, subname, submod)
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return
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def ensure_fromlist(mod, fromlist, buf, recursive):
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"""Handle 'from module import a, b, c' imports."""
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if not hasattr(mod, '__path__'):
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return
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for item in fromlist:
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if not hasattr(item, 'rindex'):
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raise TypeError("Item in ``from list'' not a string")
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if item == '*':
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if recursive:
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continue # avoid endless recursion
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try:
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all = mod.__all__
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except AttributeError:
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pass
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else:
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ret = ensure_fromlist(mod, all, buf, 1)
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if not ret:
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return 0
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elif not hasattr(mod, item):
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import_submodule(mod, item, buf + '.' + item)
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def deep_import_hook(name, globals=None, locals=None, fromlist=None, level=-1):
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"""Replacement for __import__()"""
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parent, buf = get_parent(globals, level)
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head, name, buf = load_next(parent, None if level < 0 else parent, name, buf)
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tail = head
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while name:
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tail, name, buf = load_next(tail, tail, name, buf)
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# If tail is None, both get_parent and load_next found
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# an empty module name: someone called __import__("") or
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# doctored faulty bytecode
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if tail is None:
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raise ValueError('Empty module name')
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if not fromlist:
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return head
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ensure_fromlist(tail, fromlist, buf, 0)
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return tail
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modules_reloading = {}
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def deep_reload_hook(m):
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"""Replacement for reload()."""
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if not isinstance(m, ModuleType):
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raise TypeError("reload() argument must be module")
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name = m.__name__
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if name not in sys.modules:
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raise ImportError("reload(): module %.200s not in sys.modules" % name)
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global modules_reloading
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try:
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return modules_reloading[name]
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except:
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modules_reloading[name] = m
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dot = name.rfind('.')
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if dot < 0:
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subname = name
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path = None
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else:
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try:
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parent = sys.modules[name[:dot]]
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except KeyError:
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modules_reloading.clear()
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raise ImportError("reload(): parent %.200s not in sys.modules" % name[:dot])
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subname = name[dot+1:]
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path = getattr(parent, "__path__", None)
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try:
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# This appears to be necessary on Python 3, because imp.find_module()
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# tries to import standard libraries (like io) itself, and we don't
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# want them to be processed by our deep_import_hook.
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with replace_import_hook(original_import):
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fp, filename, stuff = imp.find_module(subname, path)
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finally:
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modules_reloading.clear()
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try:
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newm = imp.load_module(name, fp, filename, stuff)
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except:
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# load_module probably removed name from modules because of
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# the error. Put back the original module object.
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sys.modules[name] = m
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raise
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finally:
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if fp: fp.close()
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modules_reloading.clear()
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return newm
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# Save the original hooks
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try:
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original_reload = builtin_mod.reload
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except AttributeError:
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original_reload = imp.reload # Python 3
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# Replacement for reload()
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def reload(module, exclude=['sys', 'os.path', builtin_mod_name, '__main__']):
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"""Recursively reload all modules used in the given module. Optionally
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takes a list of modules to exclude from reloading. The default exclude
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list contains sys, __main__, and __builtin__, to prevent, e.g., resetting
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display, exception, and io hooks.
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"""
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global found_now
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for i in exclude:
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found_now[i] = 1
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try:
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with replace_import_hook(deep_import_hook):
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return deep_reload_hook(module)
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finally:
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found_now = {}
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# Uncomment the following to automatically activate deep reloading whenever
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# this module is imported
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#builtin_mod.reload = reload
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