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# encoding: utf-8
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"""
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Test process execution and IO redirection.
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"""
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__docformat__ = "restructuredtext en"
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#-------------------------------------------------------------------------------
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# Copyright (C) 2008 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is
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# in the file COPYING, distributed as part of this software.
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#-------------------------------------------------------------------------------
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from copy import copy, deepcopy
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from cStringIO import StringIO
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import string
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import sys
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from nose.tools import assert_equal
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from IPython.frontend.prefilterfrontend import PrefilterFrontEnd
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from IPython.testing.globalipapp import get_ipython
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#-----------------------------------------------------------------------------
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# Support utilities
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#-----------------------------------------------------------------------------
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class TestPrefilterFrontEnd(PrefilterFrontEnd):
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input_prompt_template = string.Template('')
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output_prompt_template = string.Template('')
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banner = ''
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def __init__(self):
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self.out = StringIO()
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PrefilterFrontEnd.__init__(self)
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# Some more code for isolation (yeah, crazy)
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self._on_enter()
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self.out.flush()
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self.out.reset()
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self.out.truncate()
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def write(self, string, *args, **kwargs):
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self.out.write(string)
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def _on_enter(self):
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self.input_buffer += '\n'
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PrefilterFrontEnd._on_enter(self)
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def isolate_ipython0(func):
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""" Decorator to isolate execution that involves an iptyhon0.
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Notes
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-----
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Apply only to functions with no arguments. Nose skips functions
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with arguments.
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"""
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def my_func():
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ip0 = get_ipython()
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if ip0 is None:
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return func()
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# We have a real ipython running...
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user_ns = ip0.user_ns
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user_global_ns = ip0.user_global_ns
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# Previously the isolation was attempted with a deep copy of the user
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# dicts, but we found cases where this didn't work correctly. I'm not
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# quite sure why, but basically it did damage the user namespace, such
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# that later tests stopped working correctly. Instead we use a simpler
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# approach, just computing the list of added keys to the namespace and
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# eliminating those afterwards. Existing keys that may have been
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# modified remain modified. So far this has proven to be robust.
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# Compute set of old local/global keys
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old_locals = set(user_ns.keys())
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old_globals = set(user_global_ns.keys())
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try:
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out = func()
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finally:
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# Find new keys, and if any, remove them
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new_locals = set(user_ns.keys()) - old_locals
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new_globals = set(user_global_ns.keys()) - old_globals
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for k in new_locals:
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del user_ns[k]
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for k in new_globals:
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del user_global_ns[k]
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return out
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my_func.__name__ = func.__name__
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return my_func
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#-----------------------------------------------------------------------------
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# Tests
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#-----------------------------------------------------------------------------
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@isolate_ipython0
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def test_execution():
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""" Test execution of a command.
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"""
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f = TestPrefilterFrontEnd()
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f.input_buffer = 'print(1)'
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f._on_enter()
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out_value = f.out.getvalue()
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assert_equal(out_value, '1\n')
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@isolate_ipython0
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def test_multiline():
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""" Test execution of a multiline command.
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"""
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f = TestPrefilterFrontEnd()
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f.input_buffer = 'if True:'
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f._on_enter()
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f.input_buffer += 'print 1'
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f._on_enter()
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out_value = f.out.getvalue()
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yield assert_equal, out_value, ''
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f._on_enter()
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out_value = f.out.getvalue()
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yield assert_equal, out_value, '1\n'
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f = TestPrefilterFrontEnd()
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f.input_buffer='(1 +'
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f._on_enter()
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f.input_buffer += '0)'
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f._on_enter()
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out_value = f.out.getvalue()
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yield assert_equal, out_value, ''
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f._on_enter()
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out_value = f.out.getvalue()
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yield assert_equal, out_value, '1\n'
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@isolate_ipython0
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def test_capture():
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""" Test the capture of output in different channels.
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"""
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# Test on the OS-level stdout, stderr.
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f = TestPrefilterFrontEnd()
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f.input_buffer = \
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'import os; out=os.fdopen(1, "w"); out.write("1") ; out.flush()'
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f._on_enter()
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out_value = f.out.getvalue()
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yield assert_equal, out_value, '1'
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f = TestPrefilterFrontEnd()
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f.input_buffer = \
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'import os; out=os.fdopen(2, "w"); out.write("1") ; out.flush()'
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f._on_enter()
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out_value = f.out.getvalue()
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yield assert_equal, out_value, '1'
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@isolate_ipython0
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def test_magic():
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""" Test the magic expansion and history.
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This test is fairly fragile and will break when magics change.
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"""
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f = TestPrefilterFrontEnd()
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# Before checking the interactive namespace, make sure it's clear (it can
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# otherwise pick up things stored in the user's local db)
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f.input_buffer += '%reset -f'
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f._on_enter()
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f.complete_current_input()
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# Now, run the %who magic and check output
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f.input_buffer += '%who'
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f._on_enter()
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out_value = f.out.getvalue()
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assert_equal(out_value, 'Interactive namespace is empty.\n')
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@isolate_ipython0
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def test_help():
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""" Test object inspection.
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"""
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f = TestPrefilterFrontEnd()
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f.input_buffer += "def f():"
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f._on_enter()
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f.input_buffer += "'foobar'"
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f._on_enter()
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f.input_buffer += "pass"
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f._on_enter()
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f._on_enter()
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f.input_buffer += "f?"
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f._on_enter()
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assert 'traceback' not in f.last_result
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## XXX: ipython doctest magic breaks this. I have no clue why
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#out_value = f.out.getvalue()
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#assert out_value.split()[-1] == 'foobar'
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@isolate_ipython0
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def test_completion_simple():
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""" Test command-line completion on trivial examples.
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"""
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f = TestPrefilterFrontEnd()
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f.input_buffer = 'zzza = 1'
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f._on_enter()
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f.input_buffer = 'zzzb = 2'
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f._on_enter()
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f.input_buffer = 'zz'
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f.complete_current_input()
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out_value = f.out.getvalue()
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yield assert_equal, out_value, '\nzzza zzzb '
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yield assert_equal, f.input_buffer, 'zzz'
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@isolate_ipython0
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def test_completion_parenthesis():
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""" Test command-line completion when a parenthesis is open.
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"""
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f = TestPrefilterFrontEnd()
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f.input_buffer = 'zzza = 1'
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f._on_enter()
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f.input_buffer = 'zzzb = 2'
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f._on_enter()
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f.input_buffer = 'map(zz'
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f.complete_current_input()
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out_value = f.out.getvalue()
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yield assert_equal, out_value, '\nzzza zzzb '
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yield assert_equal, f.input_buffer, 'map(zzz'
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@isolate_ipython0
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def test_completion_indexing():
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""" Test command-line completion when indexing on objects.
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"""
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f = TestPrefilterFrontEnd()
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f.input_buffer = 'a = [0]'
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f._on_enter()
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f.input_buffer = 'a[0].'
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f.complete_current_input()
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if sys.version_info[:2] >= (2,6):
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# In Python 2.6, ints picked up a few non __ methods, so now there are
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# no completions.
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assert_equal(f.input_buffer, 'a[0].')
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else:
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# Right answer for 2.4/2.5
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assert_equal(f.input_buffer, 'a[0].__')
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@isolate_ipython0
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def test_completion_equal():
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""" Test command-line completion when the delimiter is "=", not " ".
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"""
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f = TestPrefilterFrontEnd()
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f.input_buffer = 'a=1.'
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f.complete_current_input()
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if sys.version_info[:2] >= (2,6):
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# In Python 2.6, ints picked up a few non __ methods, so now there are
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# no completions.
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assert_equal(f.input_buffer, 'a=1.')
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else:
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# Right answer for 2.4/2.5
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assert_equal(f.input_buffer, 'a=1.__')
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if __name__ == '__main__':
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test_magic()
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test_help()
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test_execution()
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test_multiline()
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test_capture()
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test_completion_simple()
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test_completion_complex()
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