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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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from nose.tools import assert_equal
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from IPython.frontend.prefilterfrontend import PrefilterFrontEnd
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from IPython.core.ipapi import get as get_ipython0
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from IPython.testing.plugin.ipdoctest import default_argv
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def safe_deepcopy(d):
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""" Deep copy every key of the given dict, when possible. Elsewhere
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do a copy.
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"""
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copied_d = dict()
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for key, value in d.iteritems():
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try:
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copied_d[key] = deepcopy(value)
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except:
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try:
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copied_d[key] = copy(value)
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except:
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copied_d[key] = value
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return copied_d
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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,argv=default_argv())
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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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iplib = get_ipython0()
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if iplib is None:
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return func()
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ipython0 = iplib.IP
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global_ns = safe_deepcopy(ipython0.user_global_ns)
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user_ns = safe_deepcopy(ipython0.user_ns)
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try:
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out = func()
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finally:
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ipython0.user_ns = user_ns
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ipython0.user_global_ns = global_ns
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# Undo the hack at creation of PrefilterFrontEnd
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from IPython.core import iplib
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iplib.InteractiveShell.isthreaded = False
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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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@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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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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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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