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"""Experimental code for cleaner support of IPython syntax with unittest.
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In IPython up until 0.10, we've used very hacked up nose machinery for running
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tests with IPython special syntax, and this has proved to be extremely slow.
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This module provides decorators to try a different approach, stemming from a
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conversation Brian and I (FP) had about this problem Sept/09.
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The goal is to be able to easily write simple functions that can be seen by
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unittest as tests, and ultimately for these to support doctests with full
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IPython syntax. Nose already offers this based on naming conventions and our
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hackish plugins, but we are seeking to move away from nose dependencies if
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possible.
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This module follows a different approach, based on decorators.
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- A decorator called @ipdoctest can mark any function as having a docstring
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that should be viewed as a doctest, but after syntax conversion.
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Authors
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-------
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- Fernando Perez <Fernando.Perez@berkeley.edu>
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"""
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from __future__ import absolute_import
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#-----------------------------------------------------------------------------
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# Copyright (C) 2009-2011 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 re
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import unittest
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from doctest import DocTestFinder, DocTestRunner, TestResults
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#-----------------------------------------------------------------------------
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# Classes and functions
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#-----------------------------------------------------------------------------
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def count_failures(runner):
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"""Count number of failures in a doctest runner.
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Code modeled after the summarize() method in doctest.
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"""
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return [TestResults(f, t) for f, t in runner._name2ft.values() if f > 0 ]
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class IPython2PythonConverter(object):
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"""Convert IPython 'syntax' to valid Python.
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Eventually this code may grow to be the full IPython syntax conversion
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implementation, but for now it only does prompt convertion."""
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def __init__(self):
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self.rps1 = re.compile(r'In\ \[\d+\]: ')
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self.rps2 = re.compile(r'\ \ \ \.\.\.+: ')
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self.rout = re.compile(r'Out\[\d+\]: \s*?\n?')
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self.pyps1 = '>>> '
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self.pyps2 = '... '
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self.rpyps1 = re.compile ('(\s*%s)(.*)$' % self.pyps1)
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self.rpyps2 = re.compile ('(\s*%s)(.*)$' % self.pyps2)
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def __call__(self, ds):
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"""Convert IPython prompts to python ones in a string."""
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from . import globalipapp
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pyps1 = '>>> '
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pyps2 = '... '
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pyout = ''
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dnew = ds
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dnew = self.rps1.sub(pyps1, dnew)
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dnew = self.rps2.sub(pyps2, dnew)
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dnew = self.rout.sub(pyout, dnew)
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ip = globalipapp.get_ipython()
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# Convert input IPython source into valid Python.
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out = []
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newline = out.append
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for line in dnew.splitlines():
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mps1 = self.rpyps1.match(line)
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if mps1 is not None:
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prompt, text = mps1.groups()
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newline(prompt+ip.prefilter(text, False))
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continue
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mps2 = self.rpyps2.match(line)
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if mps2 is not None:
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prompt, text = mps2.groups()
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newline(prompt+ip.prefilter(text, True))
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continue
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newline(line)
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newline('') # ensure a closing newline, needed by doctest
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#print "PYSRC:", '\n'.join(out) # dbg
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return '\n'.join(out)
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#return dnew
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class Doc2UnitTester(object):
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"""Class whose instances act as a decorator for docstring testing.
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In practice we're only likely to need one instance ever, made below (though
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no attempt is made at turning it into a singleton, there is no need for
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that).
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"""
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def __init__(self, verbose=False):
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"""New decorator.
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Parameters
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----------
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verbose : boolean, optional (False)
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Passed to the doctest finder and runner to control verbosity.
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"""
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self.verbose = verbose
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# We can reuse the same finder for all instances
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self.finder = DocTestFinder(verbose=verbose, recurse=False)
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def __call__(self, func):
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"""Use as a decorator: doctest a function's docstring as a unittest.
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This version runs normal doctests, but the idea is to make it later run
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ipython syntax instead."""
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# Capture the enclosing instance with a different name, so the new
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# class below can see it without confusion regarding its own 'self'
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# that will point to the test instance at runtime
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d2u = self
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# Rewrite the function's docstring to have python syntax
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if func.__doc__ is not None:
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func.__doc__ = ip2py(func.__doc__)
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# Now, create a tester object that is a real unittest instance, so
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# normal unittest machinery (or Nose, or Trial) can find it.
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class Tester(unittest.TestCase):
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def test(self):
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# Make a new runner per function to be tested
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runner = DocTestRunner(verbose=d2u.verbose)
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for the_test in d2u.finder.find(func, func.__name__):
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runner.run(the_test)
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failed = count_failures(runner)
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if failed:
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# Since we only looked at a single function's docstring,
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# failed should contain at most one item. More than that
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# is a case we can't handle and should error out on
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if len(failed) > 1:
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err = "Invalid number of test results:" % failed
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raise ValueError(err)
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# Report a normal failure.
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self.fail('failed doctests: %s' % str(failed[0]))
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# Rename it so test reports have the original signature.
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Tester.__name__ = func.__name__
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return Tester
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def ipdocstring(func):
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"""Change the function docstring via ip2py.
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"""
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if func.__doc__ is not None:
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func.__doc__ = ip2py(func.__doc__)
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return func
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# Make an instance of the classes for public use
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ipdoctest = Doc2UnitTester()
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ip2py = IPython2PythonConverter()
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