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"""Global IPython app to support test running.
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We must start our own ipython object and heavily muck with it so that all the
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modifications IPython makes to system behavior don't send the doctest machinery
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into a fit. This code should be considered a gross hack, but it gets the job
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done.
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"""
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from __future__ import absolute_import
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from __future__ import print_function
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#-----------------------------------------------------------------------------
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# Copyright (C) 2009-2010 The IPython Development Team
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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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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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# stdlib
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import __builtin__
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import os
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import sys
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from types import MethodType
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# our own
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from . import tools
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from IPython.utils import io
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from IPython.frontend.terminal.interactiveshell import TerminalInteractiveShell
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#-----------------------------------------------------------------------------
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# Functions
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#-----------------------------------------------------------------------------
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class StreamProxy(io.IOStream):
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"""Proxy for sys.stdout/err. This will request the stream *at call time*
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allowing for nose's Capture plugin's redirection of sys.stdout/err.
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Parameters
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----------
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name : str
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The name of the stream. This will be requested anew at every call
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"""
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def __init__(self, name):
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self.name=name
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@property
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def stream(self):
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return getattr(sys, self.name)
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def flush(self):
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self.stream.flush()
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# Hack to modify the %run command so we can sync the user's namespace with the
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# test globals. Once we move over to a clean magic system, this will be done
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# with much less ugliness.
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class py_file_finder(object):
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def __init__(self,test_filename):
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self.test_filename = test_filename
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def __call__(self,name):
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from IPython.utils.path import get_py_filename
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try:
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return get_py_filename(name)
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except IOError:
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test_dir = os.path.dirname(self.test_filename)
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new_path = os.path.join(test_dir,name)
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return get_py_filename(new_path)
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def _run_ns_sync(self,arg_s,runner=None):
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"""Modified version of %run that syncs testing namespaces.
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This is strictly needed for running doctests that call %run.
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"""
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#print('in run_ns_sync', arg_s, file=sys.stderr) # dbg
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finder = py_file_finder(arg_s)
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return get_ipython().magic_run_ori(arg_s, runner, finder)
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class ipnsdict(dict):
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"""A special subclass of dict for use as an IPython namespace in doctests.
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This subclass adds a simple checkpointing capability so that when testing
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machinery clears it (we use it as the test execution context), it doesn't
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get completely destroyed.
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In addition, it can handle the presence of the '_' key in a special manner,
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which is needed because of how Python's doctest machinery operates with
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'_'. See constructor and :meth:`update` for details.
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"""
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def __init__(self,*a):
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dict.__init__(self,*a)
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self._savedict = {}
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# If this flag is True, the .update() method will unconditionally
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# remove a key named '_'. This is so that such a dict can be used as a
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# namespace in doctests that call '_'.
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self.protect_underscore = False
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def clear(self):
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dict.clear(self)
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self.update(self._savedict)
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def _checkpoint(self):
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self._savedict.clear()
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self._savedict.update(self)
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def update(self,other):
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self._checkpoint()
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dict.update(self,other)
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if self.protect_underscore:
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# If '_' is in the namespace, python won't set it when executing
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# code *in doctests*, and we have multiple doctests that use '_'.
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# So we ensure that the namespace is always 'clean' of it before
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# it's used for test code execution.
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# This flag is only turned on by the doctest machinery, so that
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# normal test code can assume the _ key is updated like any other
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# key and can test for its presence after cell executions.
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self.pop('_', None)
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# The builtins namespace must *always* be the real __builtin__ module,
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# else weird stuff happens. The main ipython code does have provisions
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# to ensure this after %run, but since in this class we do some
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# aggressive low-level cleaning of the execution namespace, we need to
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# correct for that ourselves, to ensure consitency with the 'real'
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# ipython.
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self['__builtins__'] = __builtin__
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def __delitem__(self, key):
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"""Part of the test suite checks that we can release all
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references to an object. So we need to make sure that we're not
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keeping a reference in _savedict."""
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dict.__delitem__(self, key)
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try:
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del self._savedict[key]
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except KeyError:
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pass
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def get_ipython():
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# This will get replaced by the real thing once we start IPython below
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return start_ipython()
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# A couple of methods to override those in the running IPython to interact
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# better with doctest (doctest captures on raw stdout, so we need to direct
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# various types of output there otherwise it will miss them).
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def xsys(self, cmd):
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"""Replace the default system call with a capturing one for doctest.
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"""
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# We use getoutput, but we need to strip it because pexpect captures
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# the trailing newline differently from commands.getoutput
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print(self.getoutput(cmd, split=False).rstrip(), end='', file=sys.stdout)
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sys.stdout.flush()
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def _showtraceback(self, etype, evalue, stb):
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"""Print the traceback purely on stdout for doctest to capture it.
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"""
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print(self.InteractiveTB.stb2text(stb), file=sys.stdout)
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def start_ipython():
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"""Start a global IPython shell, which we need for IPython-specific syntax.
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"""
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global get_ipython
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# This function should only ever run once!
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if hasattr(start_ipython, 'already_called'):
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return
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start_ipython.already_called = True
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# Store certain global objects that IPython modifies
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_displayhook = sys.displayhook
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_excepthook = sys.excepthook
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_main = sys.modules.get('__main__')
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# Create custom argv and namespaces for our IPython to be test-friendly
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config = tools.default_config()
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# Create and initialize our test-friendly IPython instance.
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shell = TerminalInteractiveShell.instance(config=config,
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user_ns=ipnsdict(),
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user_global_ns={}
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)
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# A few more tweaks needed for playing nicely with doctests...
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# These traps are normally only active for interactive use, set them
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# permanently since we'll be mocking interactive sessions.
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shell.builtin_trap.activate()
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# Modify the IPython system call with one that uses getoutput, so that we
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# can capture subcommands and print them to Python's stdout, otherwise the
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# doctest machinery would miss them.
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shell.system = MethodType(xsys, shell, TerminalInteractiveShell)
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shell._showtraceback = MethodType(_showtraceback, shell,
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TerminalInteractiveShell)
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# IPython is ready, now clean up some global state...
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# Deactivate the various python system hooks added by ipython for
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# interactive convenience so we don't confuse the doctest system
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sys.modules['__main__'] = _main
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sys.displayhook = _displayhook
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sys.excepthook = _excepthook
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# So that ipython magics and aliases can be doctested (they work by making
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# a call into a global _ip object). Also make the top-level get_ipython
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# now return this without recursively calling here again.
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_ip = shell
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get_ipython = _ip.get_ipython
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__builtin__._ip = _ip
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__builtin__.get_ipython = get_ipython
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# To avoid extra IPython messages during testing, suppress io.stdout/stderr
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io.stdout = StreamProxy('stdout')
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io.stderr = StreamProxy('stderr')
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return _ip
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