300 lines
12 KiB
Python
300 lines
12 KiB
Python
"""Nose Plugin that supports IPython doctests.
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Limitations:
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- When generating examples for use as doctests, make sure that you have
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pretty-printing OFF. This can be done either by setting the
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``PlainTextFormatter.pprint`` option in your configuration file to False, or
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by interactively disabling it with %Pprint. This is required so that IPython
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output matches that of normal Python, which is used by doctest for internal
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execution.
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- Do not rely on specific prompt numbers for results (such as using
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'_34==True', for example). For IPython tests run via an external process the
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prompt numbers may be different, and IPython tests run as normal python code
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won't even have these special _NN variables set at all.
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"""
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#-----------------------------------------------------------------------------
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# Module imports
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# From the standard library
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import doctest
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import logging
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import re
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from testpath import modified_env
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#-----------------------------------------------------------------------------
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# Module globals and other constants
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#-----------------------------------------------------------------------------
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log = logging.getLogger(__name__)
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#-----------------------------------------------------------------------------
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# Classes and functions
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#-----------------------------------------------------------------------------
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class DocTestFinder(doctest.DocTestFinder):
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def _get_test(self, obj, name, module, globs, source_lines):
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test = super()._get_test(obj, name, module, globs, source_lines)
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if bool(getattr(obj, "__skip_doctest__", False)) and test is not None:
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for example in test.examples:
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example.options[doctest.SKIP] = True
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return test
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class IPDoctestOutputChecker(doctest.OutputChecker):
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"""Second-chance checker with support for random tests.
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If the default comparison doesn't pass, this checker looks in the expected
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output string for flags that tell us to ignore the output.
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"""
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random_re = re.compile(r'#\s*random\s+')
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def check_output(self, want, got, optionflags):
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"""Check output, accepting special markers embedded in the output.
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If the output didn't pass the default validation but the special string
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'#random' is included, we accept it."""
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# Let the original tester verify first, in case people have valid tests
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# that happen to have a comment saying '#random' embedded in.
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ret = doctest.OutputChecker.check_output(self, want, got,
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optionflags)
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if not ret and self.random_re.search(want):
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# print('RANDOM OK:',want, file=sys.stderr) # dbg
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return True
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return ret
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# A simple subclassing of the original with a different class name, so we can
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# distinguish and treat differently IPython examples from pure python ones.
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class IPExample(doctest.Example): pass
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class IPDocTestParser(doctest.DocTestParser):
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"""
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A class used to parse strings containing doctest examples.
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Note: This is a version modified to properly recognize IPython input and
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convert any IPython examples into valid Python ones.
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"""
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# This regular expression is used to find doctest examples in a
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# string. It defines three groups: `source` is the source code
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# (including leading indentation and prompts); `indent` is the
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# indentation of the first (PS1) line of the source code; and
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# `want` is the expected output (including leading indentation).
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# Classic Python prompts or default IPython ones
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_PS1_PY = r'>>>'
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_PS2_PY = r'\.\.\.'
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_PS1_IP = r'In\ \[\d+\]:'
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_PS2_IP = r'\ \ \ \.\.\.+:'
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_RE_TPL = r'''
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# Source consists of a PS1 line followed by zero or more PS2 lines.
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(?P<source>
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(?:^(?P<indent> [ ]*) (?P<ps1> %s) .*) # PS1 line
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(?:\n [ ]* (?P<ps2> %s) .*)*) # PS2 lines
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\n? # a newline
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# Want consists of any non-blank lines that do not start with PS1.
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(?P<want> (?:(?![ ]*$) # Not a blank line
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(?![ ]*%s) # Not a line starting with PS1
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(?![ ]*%s) # Not a line starting with PS2
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.*$\n? # But any other line
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)*)
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'''
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_EXAMPLE_RE_PY = re.compile( _RE_TPL % (_PS1_PY,_PS2_PY,_PS1_PY,_PS2_PY),
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re.MULTILINE | re.VERBOSE)
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_EXAMPLE_RE_IP = re.compile( _RE_TPL % (_PS1_IP,_PS2_IP,_PS1_IP,_PS2_IP),
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re.MULTILINE | re.VERBOSE)
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# Mark a test as being fully random. In this case, we simply append the
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# random marker ('#random') to each individual example's output. This way
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# we don't need to modify any other code.
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_RANDOM_TEST = re.compile(r'#\s*all-random\s+')
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def ip2py(self,source):
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"""Convert input IPython source into valid Python."""
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block = _ip.input_transformer_manager.transform_cell(source)
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if len(block.splitlines()) == 1:
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return _ip.prefilter(block)
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else:
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return block
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def parse(self, string, name='<string>'):
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"""
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Divide the given string into examples and intervening text,
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and return them as a list of alternating Examples and strings.
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Line numbers for the Examples are 0-based. The optional
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argument `name` is a name identifying this string, and is only
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used for error messages.
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"""
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# print('Parse string:\n',string) # dbg
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string = string.expandtabs()
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# If all lines begin with the same indentation, then strip it.
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min_indent = self._min_indent(string)
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if min_indent > 0:
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string = '\n'.join([l[min_indent:] for l in string.split('\n')])
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output = []
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charno, lineno = 0, 0
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# We make 'all random' tests by adding the '# random' mark to every
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# block of output in the test.
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if self._RANDOM_TEST.search(string):
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random_marker = '\n# random'
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else:
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random_marker = ''
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# Whether to convert the input from ipython to python syntax
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ip2py = False
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# Find all doctest examples in the string. First, try them as Python
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# examples, then as IPython ones
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terms = list(self._EXAMPLE_RE_PY.finditer(string))
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if terms:
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# Normal Python example
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Example = doctest.Example
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else:
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# It's an ipython example.
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terms = list(self._EXAMPLE_RE_IP.finditer(string))
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Example = IPExample
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ip2py = True
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for m in terms:
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# Add the pre-example text to `output`.
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output.append(string[charno:m.start()])
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# Update lineno (lines before this example)
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lineno += string.count('\n', charno, m.start())
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# Extract info from the regexp match.
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(source, options, want, exc_msg) = \
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self._parse_example(m, name, lineno,ip2py)
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# Append the random-output marker (it defaults to empty in most
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# cases, it's only non-empty for 'all-random' tests):
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want += random_marker
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# Create an Example, and add it to the list.
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if not self._IS_BLANK_OR_COMMENT(source):
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output.append(Example(source, want, exc_msg,
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lineno=lineno,
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indent=min_indent+len(m.group('indent')),
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options=options))
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# Update lineno (lines inside this example)
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lineno += string.count('\n', m.start(), m.end())
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# Update charno.
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charno = m.end()
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# Add any remaining post-example text to `output`.
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output.append(string[charno:])
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return output
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def _parse_example(self, m, name, lineno,ip2py=False):
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"""
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Given a regular expression match from `_EXAMPLE_RE` (`m`),
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return a pair `(source, want)`, where `source` is the matched
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example's source code (with prompts and indentation stripped);
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and `want` is the example's expected output (with indentation
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stripped).
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`name` is the string's name, and `lineno` is the line number
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where the example starts; both are used for error messages.
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Optional:
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`ip2py`: if true, filter the input via IPython to convert the syntax
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into valid python.
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"""
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# Get the example's indentation level.
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indent = len(m.group('indent'))
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# Divide source into lines; check that they're properly
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# indented; and then strip their indentation & prompts.
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source_lines = m.group('source').split('\n')
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# We're using variable-length input prompts
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ps1 = m.group('ps1')
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ps2 = m.group('ps2')
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ps1_len = len(ps1)
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self._check_prompt_blank(source_lines, indent, name, lineno,ps1_len)
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if ps2:
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self._check_prefix(source_lines[1:], ' '*indent + ps2, name, lineno)
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source = '\n'.join([sl[indent+ps1_len+1:] for sl in source_lines])
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if ip2py:
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# Convert source input from IPython into valid Python syntax
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source = self.ip2py(source)
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# Divide want into lines; check that it's properly indented; and
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# then strip the indentation. Spaces before the last newline should
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# be preserved, so plain rstrip() isn't good enough.
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want = m.group('want')
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want_lines = want.split('\n')
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if len(want_lines) > 1 and re.match(r' *$', want_lines[-1]):
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del want_lines[-1] # forget final newline & spaces after it
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self._check_prefix(want_lines, ' '*indent, name,
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lineno + len(source_lines))
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# Remove ipython output prompt that might be present in the first line
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want_lines[0] = re.sub(r'Out\[\d+\]: \s*?\n?','',want_lines[0])
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want = '\n'.join([wl[indent:] for wl in want_lines])
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# If `want` contains a traceback message, then extract it.
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m = self._EXCEPTION_RE.match(want)
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if m:
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exc_msg = m.group('msg')
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else:
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exc_msg = None
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# Extract options from the source.
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options = self._find_options(source, name, lineno)
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return source, options, want, exc_msg
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def _check_prompt_blank(self, lines, indent, name, lineno, ps1_len):
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"""
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Given the lines of a source string (including prompts and
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leading indentation), check to make sure that every prompt is
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followed by a space character. If any line is not followed by
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a space character, then raise ValueError.
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Note: IPython-modified version which takes the input prompt length as a
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parameter, so that prompts of variable length can be dealt with.
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"""
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space_idx = indent+ps1_len
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min_len = space_idx+1
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for i, line in enumerate(lines):
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if len(line) >= min_len and line[space_idx] != ' ':
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raise ValueError('line %r of the docstring for %s '
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'lacks blank after %s: %r' %
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(lineno+i+1, name,
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line[indent:space_idx], line))
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SKIP = doctest.register_optionflag('SKIP')
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class IPDocTestRunner(doctest.DocTestRunner,object):
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"""Test runner that synchronizes the IPython namespace with test globals.
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"""
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def run(self, test, compileflags=None, out=None, clear_globs=True):
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# Override terminal size to standardise traceback format
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with modified_env({'COLUMNS': '80', 'LINES': '24'}):
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return super(IPDocTestRunner,self).run(test,
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compileflags,out,clear_globs)
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