# Module doctest.

# Released to the public domain 16-Jan-2001, by Tim Peters (tim@python.org).

# Major enhancements and refactoring by:

#     Jim Fulton

#     Edward Loper



# Provided as-is; use at your own risk; no warranty; no promises; enjoy!



r"""Module doctest -- a framework for running examples in docstrings.



In simplest use, end each module M to be tested with:



def _test():

    import doctest

    doctest.testmod()



if __name__ == "__main__":

    _test()



Then running the module as a script will cause the examples in the

docstrings to get executed and verified:



python M.py



This won't display anything unless an example fails, in which case the

failing example(s) and the cause(s) of the failure(s) are printed to stdout

(why not stderr? because stderr is a lame hack <0.2 wink>), and the final

line of output is "Test failed.".



Run it with the -v switch instead:



python M.py -v



and a detailed report of all examples tried is printed to stdout, along

with assorted summaries at the end.



You can force verbose mode by passing "verbose=True" to testmod, or prohibit

it by passing "verbose=False".  In either of those cases, sys.argv is not

examined by testmod.



There are a variety of other ways to run doctests, including integration

with the unittest framework, and support for running non-Python text

files containing doctests.  There are also many ways to override parts

of doctest's default behaviors.  See the Library Reference Manual for

details.

"""



__docformat__ = 'reStructuredText en'



__all__ = [

    # 0, Option Flags

    'register_optionflag',

    'DONT_ACCEPT_TRUE_FOR_1',

    'DONT_ACCEPT_BLANKLINE',

    'NORMALIZE_WHITESPACE',

    'ELLIPSIS',

    'SKIP',

    'IGNORE_EXCEPTION_DETAIL',

    'COMPARISON_FLAGS',

    'REPORT_UDIFF',

    'REPORT_CDIFF',

    'REPORT_NDIFF',

    'REPORT_ONLY_FIRST_FAILURE',

    'REPORTING_FLAGS',

    # 1. Utility Functions

    # 2. Example & DocTest

    'Example',

    'DocTest',

    # 3. Doctest Parser

    'DocTestParser',

    # 4. Doctest Finder

    'DocTestFinder',

    # 5. Doctest Runner

    'DocTestRunner',

    'OutputChecker',

    'DocTestFailure',

    'UnexpectedException',

    'DebugRunner',

    # 6. Test Functions

    'testmod',

    'testfile',

    'run_docstring_examples',

    # 7. Tester

    'Tester',

    # 8. Unittest Support

    'DocTestSuite',

    'DocFileSuite',

    'set_unittest_reportflags',

    # 9. Debugging Support

    'script_from_examples',

    'testsource',

    'debug_src',

    'debug',

]



import __future__



import sys, traceback, inspect, linecache, os, re

import unittest, difflib, pdb, tempfile

import warnings

from StringIO import StringIO

from collections import namedtuple



TestResults = namedtuple('TestResults', 'failed attempted')



# There are 4 basic classes:

#  - Example: a <source, want> pair, plus an intra-docstring line number.

#  - DocTest: a collection of examples, parsed from a docstring, plus

#    info about where the docstring came from (name, filename, lineno).

#  - DocTestFinder: extracts DocTests from a given object's docstring and

#    its contained objects' docstrings.

#  - DocTestRunner: runs DocTest cases, and accumulates statistics.

#

# So the basic picture is:

#

#                             list of:

# +------+                   +---------+                   +-------+

# |object| --DocTestFinder-> | DocTest | --DocTestRunner-> |results|

# +------+                   +---------+                   +-------+

#                            | Example |

#                            |   ...   |

#                            | Example |

#                            +---------+



# Option constants.



OPTIONFLAGS_BY_NAME = {}

def register_optionflag(name):

    # Create a new flag unless `name` is already known.

    return OPTIONFLAGS_BY_NAME.setdefault(name, 1 << len(OPTIONFLAGS_BY_NAME))



DONT_ACCEPT_TRUE_FOR_1 = register_optionflag('DONT_ACCEPT_TRUE_FOR_1')

DONT_ACCEPT_BLANKLINE = register_optionflag('DONT_ACCEPT_BLANKLINE')

NORMALIZE_WHITESPACE = register_optionflag('NORMALIZE_WHITESPACE')

ELLIPSIS = register_optionflag('ELLIPSIS')

SKIP = register_optionflag('SKIP')

IGNORE_EXCEPTION_DETAIL = register_optionflag('IGNORE_EXCEPTION_DETAIL')



COMPARISON_FLAGS = (DONT_ACCEPT_TRUE_FOR_1 |

                    DONT_ACCEPT_BLANKLINE |

                    NORMALIZE_WHITESPACE |

                    ELLIPSIS |

                    SKIP |

                    IGNORE_EXCEPTION_DETAIL)



REPORT_UDIFF = register_optionflag('REPORT_UDIFF')

REPORT_CDIFF = register_optionflag('REPORT_CDIFF')

REPORT_NDIFF = register_optionflag('REPORT_NDIFF')

REPORT_ONLY_FIRST_FAILURE = register_optionflag('REPORT_ONLY_FIRST_FAILURE')



REPORTING_FLAGS = (REPORT_UDIFF |

                   REPORT_CDIFF |

                   REPORT_NDIFF |

                   REPORT_ONLY_FIRST_FAILURE)



# Special string markers for use in `want` strings:

BLANKLINE_MARKER = '<BLANKLINE>'

ELLIPSIS_MARKER = '...'



######################################################################

## Table of Contents

######################################################################

#  1. Utility Functions

#  2. Example & DocTest -- store test cases

#  3. DocTest Parser -- extracts examples from strings

#  4. DocTest Finder -- extracts test cases from objects

#  5. DocTest Runner -- runs test cases

#  6. Test Functions -- convenient wrappers for testing

#  7. Tester Class -- for backwards compatibility

#  8. Unittest Support

#  9. Debugging Support

# 10. Example Usage



######################################################################

## 1. Utility Functions

######################################################################



def _extract_future_flags(globs):

    """

    Return the compiler-flags associated with the future features that

    have been imported into the given namespace (globs).

    """

    flags = 0

    for fname in __future__.all_feature_names:

        feature = globs.get(fname, None)

        if feature is getattr(__future__, fname):

            flags |= feature.compiler_flag

    return flags



def _normalize_module(module, depth=2):

    """

    Return the module specified by `module`.  In particular:

      - If `module` is a module, then return module.

      - If `module` is a string, then import and return the

        module with that name.

      - If `module` is None, then return the calling module.

        The calling module is assumed to be the module of

        the stack frame at the given depth in the call stack.

    """

    if inspect.ismodule(module):

        return module

    elif isinstance(module, (str, unicode)):

        return __import__(module, globals(), locals(), ["*"])

    elif module is None:

        return sys.modules[sys._getframe(depth).f_globals['__name__']]

    else:

        raise TypeError("Expected a module, string, or None")



def _load_testfile(filename, package, module_relative):

    if module_relative:

        package = _normalize_module(package, 3)

        filename = _module_relative_path(package, filename)

        if hasattr(package, '__loader__'):

            if hasattr(package.__loader__, 'get_data'):

                file_contents = package.__loader__.get_data(filename)

                # get_data() opens files as 'rb', so one must do the equivalent

                # conversion as universal newlines would do.

                return file_contents.replace(os.linesep, '\n'), filename

    return open(filename).read(), filename



def _indent(s, indent=4):

    """

    Add the given number of space characters to the beginning every

    non-blank line in `s`, and return the result.

    """

    # This regexp matches the start of non-blank lines:

    return re.sub('(?m)^(?!$)', indent*' ', s)



def _exception_traceback(exc_info):

    """

    Return a string containing a traceback message for the given

    exc_info tuple (as returned by sys.exc_info()).

    """

    # Get a traceback message.

    excout = StringIO()

    exc_type, exc_val, exc_tb = exc_info

    traceback.print_exception(exc_type, exc_val, exc_tb, file=excout)

    return excout.getvalue()



# Override some StringIO methods.

class _SpoofOut(StringIO):

    def getvalue(self):

        result = StringIO.getvalue(self)

        # If anything at all was written, make sure there's a trailing

        # newline.  There's no way for the expected output to indicate

        # that a trailing newline is missing.

        if result and not result.endswith("\n"):

            result += "\n"

        # Prevent softspace from screwing up the next test case, in

        # case they used print with a trailing comma in an example.

        if hasattr(self, "softspace"):

            del self.softspace

        return result



    def truncate(self,   size=None):

        StringIO.truncate(self, size)

        if hasattr(self, "softspace"):

            del self.softspace



# Worst-case linear-time ellipsis matching.

def _ellipsis_match(want, got):

    """

    Essentially the only subtle case:

    >>> _ellipsis_match('aa...aa', 'aaa')

    False

    """

    if ELLIPSIS_MARKER not in want:

        return want == got



    # Find "the real" strings.

    ws = want.split(ELLIPSIS_MARKER)

    assert len(ws) >= 2



    # Deal with exact matches possibly needed at one or both ends.

    startpos, endpos = 0, len(got)

    w = ws[0]

    if w:   # starts with exact match

        if got.startswith(w):

            startpos = len(w)

            del ws[0]

        else:

            return False

    w = ws[-1]

    if w:   # ends with exact match

        if got.endswith(w):

            endpos -= len(w)

            del ws[-1]

        else:

            return False



    if startpos > endpos:

        # Exact end matches required more characters than we have, as in

        # _ellipsis_match('aa...aa', 'aaa')

        return False



    # For the rest, we only need to find the leftmost non-overlapping

    # match for each piece.  If there's no overall match that way alone,

    # there's no overall match period.

    for w in ws:

        # w may be '' at times, if there are consecutive ellipses, or

        # due to an ellipsis at the start or end of `want`.  That's OK.

        # Search for an empty string succeeds, and doesn't change startpos.

        startpos = got.find(w, startpos, endpos)

        if startpos < 0:

            return False

        startpos += len(w)



    return True



def _comment_line(line):

    "Return a commented form of the given line"

    line = line.rstrip()

    if line:

        return '# '+line

    else:

        return '#'



class _OutputRedirectingPdb(pdb.Pdb):

    """

    A specialized version of the python debugger that redirects stdout

    to a given stream when interacting with the user.  Stdout is *not*

    redirected when traced code is executed.

    """

    def __init__(self, out):

        self.__out = out

        self.__debugger_used = False

        pdb.Pdb.__init__(self, stdout=out)



    def set_trace(self, frame=None):

        self.__debugger_used = True

        if frame is None:

            frame = sys._getframe().f_back

        pdb.Pdb.set_trace(self, frame)



    def set_continue(self):

        # Calling set_continue unconditionally would break unit test

        # coverage reporting, as Bdb.set_continue calls sys.settrace(None).

        if self.__debugger_used:

            pdb.Pdb.set_continue(self)



    def trace_dispatch(self, *args):

        # Redirect stdout to the given stream.

        save_stdout = sys.stdout

        sys.stdout = self.__out

        # Call Pdb's trace dispatch method.

        try:

            return pdb.Pdb.trace_dispatch(self, *args)

        finally:

            sys.stdout = save_stdout



# [XX] Normalize with respect to os.path.pardir?

def _module_relative_path(module, path):

    if not inspect.ismodule(module):

        raise TypeError, 'Expected a module: %r' % module

    if path.startswith('/'):

        raise ValueError, 'Module-relative files may not have absolute paths'



    # Find the base directory for the path.

    if hasattr(module, '__file__'):

        # A normal module/package

        basedir = os.path.split(module.__file__)[0]

    elif module.__name__ == '__main__':

        # An interactive session.

        if len(sys.argv)>0 and sys.argv[0] != '':

            basedir = os.path.split(sys.argv[0])[0]

        else:

            basedir = os.curdir

    else:

        # A module w/o __file__ (this includes builtins)

        raise ValueError("Can't resolve paths relative to the module " +

                         module + " (it has no __file__)")



    # Combine the base directory and the path.

    return os.path.join(basedir, *(path.split('/')))



######################################################################

## 2. Example & DocTest

######################################################################

## - An "example" is a <source, want> pair, where "source" is a

##   fragment of source code, and "want" is the expected output for

##   "source."  The Example class also includes information about

##   where the example was extracted from.

##

## - A "doctest" is a collection of examples, typically extracted from

##   a string (such as an object's docstring).  The DocTest class also

##   includes information about where the string was extracted from.



class Example:

    """

    A single doctest example, consisting of source code and expected

    output.  `Example` defines the following attributes:



      - source: A single Python statement, always ending with a newline.

        The constructor adds a newline if needed.



      - want: The expected output from running the source code (either

        from stdout, or a traceback in case of exception).  `want` ends

        with a newline unless it's empty, in which case it's an empty

        string.  The constructor adds a newline if needed.



      - exc_msg: The exception message generated by the example, if

        the example is expected to generate an exception; or `None` if

        it is not expected to generate an exception.  This exception

        message is compared against the return value of

        `traceback.format_exception_only()`.  `exc_msg` ends with a

        newline unless it's `None`.  The constructor adds a newline

        if needed.



      - lineno: The line number within the DocTest string containing

        this Example where the Example begins.  This line number is

        zero-based, with respect to the beginning of the DocTest.



      - indent: The example's indentation in the DocTest string.

        I.e., the number of space characters that preceed the

        example's first prompt.



      - options: A dictionary mapping from option flags to True or

        False, which is used to override default options for this

        example.  Any option flags not contained in this dictionary

        are left at their default value (as specified by the

        DocTestRunner's optionflags).  By default, no options are set.

    """

    def __init__(self, source, want, exc_msg=None, lineno=0, indent=0,

                 options=None):

        # Normalize inputs.

        if not source.endswith('\n'):

            source += '\n'

        if want and not want.endswith('\n'):

            want += '\n'

        if exc_msg is not None and not exc_msg.endswith('\n'):

            exc_msg += '\n'

        # Store properties.

        self.source = source

        self.want = want

        self.lineno = lineno

        self.indent = indent

        if options is None: options = {}

        self.options = options

        self.exc_msg = exc_msg



class DocTest:

    """

    A collection of doctest examples that should be run in a single

    namespace.  Each `DocTest` defines the following attributes:



      - examples: the list of examples.



      - globs: The namespace (aka globals) that the examples should

        be run in.



      - name: A name identifying the DocTest (typically, the name of

        the object whose docstring this DocTest was extracted from).



      - filename: The name of the file that this DocTest was extracted

        from, or `None` if the filename is unknown.



      - lineno: The line number within filename where this DocTest

        begins, or `None` if the line number is unavailable.  This

        line number is zero-based, with respect to the beginning of

        the file.



      - docstring: The string that the examples were extracted from,

        or `None` if the string is unavailable.

    """

    def __init__(self, examples, globs, name, filename, lineno, docstring):

        """

        Create a new DocTest containing the given examples.  The

        DocTest's globals are initialized with a copy of `globs`.

        """

        assert not isinstance(examples, basestring), \

               "DocTest no longer accepts str; use DocTestParser instead"

        self.examples = examples

        self.docstring = docstring

        self.globs = globs.copy()

        self.name = name

        self.filename = filename

        self.lineno = lineno



    def __repr__(self):

        if len(self.examples) == 0:

            examples = 'no examples'

        elif len(self.examples) == 1:

            examples = '1 example'

        else:

            examples = '%d examples' % len(self.examples)

        return ('<DocTest %s from %s:%s (%s)>' %

                (self.name, self.filename, self.lineno, examples))





    # This lets us sort tests by name:

    def __cmp__(self, other):

        if not isinstance(other, DocTest):

            return -1

        return cmp((self.name, self.filename, self.lineno, id(self)),

                   (other.name, other.filename, other.lineno, id(other)))



######################################################################

## 3. DocTestParser

######################################################################



class DocTestParser:

    """

    A class used to parse strings containing doctest examples.

    """

    # This regular expression is used to find doctest examples in a

    # string.  It defines three groups: `source` is the source code

    # (including leading indentation and prompts); `indent` is the

    # indentation of the first (PS1) line of the source code; and

    # `want` is the expected output (including leading indentation).

    _EXAMPLE_RE = re.compile(r'''

        # Source consists of a PS1 line followed by zero or more PS2 lines.

        (?P<source>

            (?:^(?P<indent> [ ]*) >>>    .*)    # PS1 line

            (?:\n           [ ]*  \.\.\. .*)*)  # PS2 lines

        \n?

        # Want consists of any non-blank lines that do not start with PS1.

        (?P<want> (?:(?![ ]*$)    # Not a blank line

                     (?![ ]*>>>)  # Not a line starting with PS1

                     .*$\n?       # But any other line

                  )*)

        ''', re.MULTILINE | re.VERBOSE)



    # A regular expression for handling `want` strings that contain

    # expected exceptions.  It divides `want` into three pieces:

    #    - the traceback header line (`hdr`)

    #    - the traceback stack (`stack`)

    #    - the exception message (`msg`), as generated by

    #      traceback.format_exception_only()

    # `msg` may have multiple lines.  We assume/require that the

    # exception message is the first non-indented line starting with a word

    # character following the traceback header line.

    _EXCEPTION_RE = re.compile(r"""

        # Grab the traceback header.  Different versions of Python have

        # said different things on the first traceback line.

        ^(?P<hdr> Traceback\ \(

            (?: most\ recent\ call\ last

            |   innermost\ last

            ) \) :

        )

        \s* $                # toss trailing whitespace on the header.

        (?P<stack> .*?)      # don't blink: absorb stuff until...

        ^ (?P<msg> \w+ .*)   #     a line *starts* with alphanum.

        """, re.VERBOSE | re.MULTILINE | re.DOTALL)



    # A callable returning a true value iff its argument is a blank line

    # or contains a single comment.

    _IS_BLANK_OR_COMMENT = re.compile(r'^[ ]*(#.*)?$').match



    def parse(self, string, name='<string>'):

        """

        Divide the given string into examples and intervening text,

        and return them as a list of alternating Examples and strings.

        Line numbers for the Examples are 0-based.  The optional

        argument `name` is a name identifying this string, and is only

        used for error messages.

        """

        string = string.expandtabs()

        # If all lines begin with the same indentation, then strip it.

        min_indent = self._min_indent(string)

        if min_indent > 0:

            string = '\n'.join([l[min_indent:] for l in string.split('\n')])



        output = []

        charno, lineno = 0, 0

        # Find all doctest examples in the string:

        for m in self._EXAMPLE_RE.finditer(string):

            # Add the pre-example text to `output`.

            output.append(string[charno:m.start()])

            # Update lineno (lines before this example)

            lineno += string.count('\n', charno, m.start())

            # Extract info from the regexp match.

            (source, options, want, exc_msg) = \

                     self._parse_example(m, name, lineno)

            # Create an Example, and add it to the list.

            if not self._IS_BLANK_OR_COMMENT(source):

                output.append( Example(source, want, exc_msg,

                                    lineno=lineno,

                                    indent=min_indent+len(m.group('indent')),

                                    options=options) )

            # Update lineno (lines inside this example)

            lineno += string.count('\n', m.start(), m.end())

            # Update charno.

            charno = m.end()

        # Add any remaining post-example text to `output`.

        output.append(string[charno:])

        return output



    def get_doctest(self, string, globs, name, filename, lineno):

        """

        Extract all doctest examples from the given string, and

        collect them into a `DocTest` object.



        `globs`, `name`, `filename`, and `lineno` are attributes for

        the new `DocTest` object.  See the documentation for `DocTest`

        for more information.

        """

        return DocTest(self.get_examples(string, name), globs,

                       name, filename, lineno, string)



    def get_examples(self, string, name='<string>'):

        """

        Extract all doctest examples from the given string, and return

        them as a list of `Example` objects.  Line numbers are

        0-based, because it's most common in doctests that nothing

        interesting appears on the same line as opening triple-quote,

        and so the first interesting line is called \"line 1\" then.



        The optional argument `name` is a name identifying this

        string, and is only used for error messages.

        """

        return [x for x in self.parse(string, name)

                if isinstance(x, Example)]



    def _parse_example(self, m, name, lineno):

        """

        Given a regular expression match from `_EXAMPLE_RE` (`m`),

        return a pair `(source, want)`, where `source` is the matched

        example's source code (with prompts and indentation stripped);

        and `want` is the example's expected output (with indentation

        stripped).



        `name` is the string's name, and `lineno` is the line number

        where the example starts; both are used for error messages.

        """

        # Get the example's indentation level.

        indent = len(m.group('indent'))



        # Divide source into lines; check that they're properly

        # indented; and then strip their indentation & prompts.

        source_lines = m.group('source').split('\n')

        self._check_prompt_blank(source_lines, indent, name, lineno)

        self._check_prefix(source_lines[1:], ' '*indent + '.', name, lineno)

        source = '\n'.join([sl[indent+4:] for sl in source_lines])



        # Divide want into lines; check that it's properly indented; and

        # then strip the indentation.  Spaces before the last newline should

        # be preserved, so plain rstrip() isn't good enough.

        want = m.group('want')

        want_lines = want.split('\n')

        if len(want_lines) > 1 and re.match(r' *$', want_lines[-1]):

            del want_lines[-1]  # forget final newline & spaces after it

        self._check_prefix(want_lines, ' '*indent, name,

                           lineno + len(source_lines))

        want = '\n'.join([wl[indent:] for wl in want_lines])



        # If `want` contains a traceback message, then extract it.

        m = self._EXCEPTION_RE.match(want)

        if m:

            exc_msg = m.group('msg')

        else:

            exc_msg = None



        # Extract options from the source.

        options = self._find_options(source, name, lineno)



        return source, options, want, exc_msg



    # This regular expression looks for option directives in the

    # source code of an example.  Option directives are comments

    # starting with "doctest:".  Warning: this may give false

    # positives for string-literals that contain the string

    # "#doctest:".  Eliminating these false positives would require

    # actually parsing the string; but we limit them by ignoring any

    # line containing "#doctest:" that is *followed* by a quote mark.

    _OPTION_DIRECTIVE_RE = re.compile(r'#\s*doctest:\s*([^\n\'"]*)$',

                                      re.MULTILINE)



    def _find_options(self, source, name, lineno):

        """

        Return a dictionary containing option overrides extracted from

        option directives in the given source string.



        `name` is the string's name, and `lineno` is the line number

        where the example starts; both are used for error messages.

        """

        options = {}

        # (note: with the current regexp, this will match at most once:)

        for m in self._OPTION_DIRECTIVE_RE.finditer(source):

            option_strings = m.group(1).replace(',', ' ').split()

            for option in option_strings:

                if (option[0] not in '+-' or

                    option[1:] not in OPTIONFLAGS_BY_NAME):

                    raise ValueError('line %r of the doctest for %s '

                                     'has an invalid option: %r' %

                                     (lineno+1, name, option))

                flag = OPTIONFLAGS_BY_NAME[option[1:]]

                options[flag] = (option[0] == '+')

        if options and self._IS_BLANK_OR_COMMENT(source):

            raise ValueError('line %r of the doctest for %s has an option '

                             'directive on a line with no example: %r' %

                             (lineno, name, source))

        return options



    # This regular expression finds the indentation of every non-blank

    # line in a string.

    _INDENT_RE = re.compile('^([ ]*)(?=\S)', re.MULTILINE)



    def _min_indent(self, s):

        "Return the minimum indentation of any non-blank line in `s`"

        indents = [len(indent) for indent in self._INDENT_RE.findall(s)]

        if len(indents) > 0:

            return min(indents)

        else:

            return 0



    def _check_prompt_blank(self, lines, indent, name, lineno):

        """

        Given the lines of a source string (including prompts and

        leading indentation), check to make sure that every prompt is

        followed by a space character.  If any line is not followed by

        a space character, then raise ValueError.

        """

        for i, line in enumerate(lines):

            if len(line) >= indent+4 and line[indent+3] != ' ':

                raise ValueError('line %r of the docstring for %s '

                                 'lacks blank after %s: %r' %

                                 (lineno+i+1, name,

                                  line[indent:indent+3], line))



    def _check_prefix(self, lines, prefix, name, lineno):

        """

        Check that every line in the given list starts with the given

        prefix; if any line does not, then raise a ValueError.

        """

        for i, line in enumerate(lines):

            if line and not line.startswith(prefix):

                raise ValueError('line %r of the docstring for %s has '

                                 'inconsistent leading whitespace: %r' %

                                 (lineno+i+1, name, line))





######################################################################

## 4. DocTest Finder

######################################################################



class DocTestFinder:

    """

    A class used to extract the DocTests that are relevant to a given

    object, from its docstring and the docstrings of its contained

    objects.  Doctests can currently be extracted from the following

    object types: modules, functions, classes, methods, staticmethods,

    classmethods, and properties.

    """



    def __init__(self, verbose=False, parser=DocTestParser(),

                 recurse=True, exclude_empty=True):

        """

        Create a new doctest finder.



        The optional argument `parser` specifies a class or

        function that should be used to create new DocTest objects (or

        objects that implement the same interface as DocTest).  The

        signature for this factory function should match the signature

        of the DocTest constructor.



        If the optional argument `recurse` is false, then `find` will

        only examine the given object, and not any contained objects.



        If the optional argument `exclude_empty` is false, then `find`

        will include tests for objects with empty docstrings.

        """

        self._parser = parser

        self._verbose = verbose

        self._recurse = recurse

        self._exclude_empty = exclude_empty



    def find(self, obj, name=None, module=None, globs=None, extraglobs=None):

        """

        Return a list of the DocTests that are defined by the given

        object's docstring, or by any of its contained objects'

        docstrings.



        The optional parameter `module` is the module that contains

        the given object.  If the module is not specified or is None, then

        the test finder will attempt to automatically determine the

        correct module.  The object's module is used:



            - As a default namespace, if `globs` is not specified.

            - To prevent the DocTestFinder from extracting DocTests

              from objects that are imported from other modules.

            - To find the name of the file containing the object.

            - To help find the line number of the object within its

              file.



        Contained objects whose module does not match `module` are ignored.



        If `module` is False, no attempt to find the module will be made.

        This is obscure, of use mostly in tests:  if `module` is False, or

        is None but cannot be found automatically, then all objects are

        considered to belong to the (non-existent) module, so all contained

        objects will (recursively) be searched for doctests.



        The globals for each DocTest is formed by combining `globs`

        and `extraglobs` (bindings in `extraglobs` override bindings

        in `globs`).  A new copy of the globals dictionary is created

        for each DocTest.  If `globs` is not specified, then it

        defaults to the module's `__dict__`, if specified, or {}

        otherwise.  If `extraglobs` is not specified, then it defaults

        to {}.



        """

        # If name was not specified, then extract it from the object.

        if name is None:

            name = getattr(obj, '__name__', None)

            if name is None:

                raise ValueError("DocTestFinder.find: name must be given "

                        "when obj.__name__ doesn't exist: %r" %

                                 (type(obj),))



        # Find the module that contains the given object (if obj is

        # a module, then module=obj.).  Note: this may fail, in which

        # case module will be None.

        if module is False:

            module = None

        elif module is None:

            module = inspect.getmodule(obj)



        # Read the module's source code.  This is used by

        # DocTestFinder._find_lineno to find the line number for a

        # given object's docstring.

        try:

            file = inspect.getsourcefile(obj) or inspect.getfile(obj)

            if module is not None:

                # Supply the module globals in case the module was

                # originally loaded via a PEP 302 loader and

                # file is not a valid filesystem path

                source_lines = linecache.getlines(file, module.__dict__)

            else:

                # No access to a loader, so assume it's a normal

                # filesystem path

                source_lines = linecache.getlines(file)

            if not source_lines:

                source_lines = None

        except TypeError:

            source_lines = None



        # Initialize globals, and merge in extraglobs.

        if globs is None:

            if module is None:

                globs = {}

            else:

                globs = module.__dict__.copy()

        else:

            globs = globs.copy()

        if extraglobs is not None:

            globs.update(extraglobs)

        if '__name__' not in globs:

            globs['__name__'] = '__main__'  # provide a default module name



        # Recursively expore `obj`, extracting DocTests.

        tests = []

        self._find(tests, obj, name, module, source_lines, globs, {})

        # Sort the tests by alpha order of names, for consistency in

        # verbose-mode output.  This was a feature of doctest in Pythons

        # <= 2.3 that got lost by accident in 2.4.  It was repaired in

        # 2.4.4 and 2.5.

        tests.sort()

        return tests



    def _from_module(self, module, object):

        """

        Return true if the given object is defined in the given

        module.

        """

        if module is None:

            return True

        elif inspect.getmodule(object) is not None:

            return module is inspect.getmodule(object)

        elif inspect.isfunction(object):

            return module.__dict__ is object.func_globals

        elif inspect.isclass(object):

            return module.__name__ == object.__module__

        elif hasattr(object, '__module__'):

            return module.__name__ == object.__module__

        elif isinstance(object, property):

            return True # [XX] no way not be sure.

        else:

            raise ValueError("object must be a class or function")



    def _find(self, tests, obj, name, module, source_lines, globs, seen):

        """

        Find tests for the given object and any contained objects, and

        add them to `tests`.

        """

        if self._verbose:

            print 'Finding tests in %s' % name



        # If we've already processed this object, then ignore it.

        if id(obj) in seen:

            return

        seen[id(obj)] = 1



        # Find a test for this object, and add it to the list of tests.

        test = self._get_test(obj, name, module, globs, source_lines)

        if test is not None:

            tests.append(test)



        # Look for tests in a module's contained objects.

        if inspect.ismodule(obj) and self._recurse:

            for valname, val in obj.__dict__.items():

                valname = '%s.%s' % (name, valname)

                # Recurse to functions & classes.

                if ((inspect.isfunction(val) or inspect.isclass(val)) and

                    self._from_module(module, val)):

                    self._find(tests, val, valname, module, source_lines,

                               globs, seen)



        # Look for tests in a module's __test__ dictionary.

        if inspect.ismodule(obj) and self._recurse:

            for valname, val in getattr(obj, '__test__', {}).items():

                if not isinstance(valname, basestring):

                    raise ValueError("DocTestFinder.find: __test__ keys "

                                     "must be strings: %r" %

                                     (type(valname),))

                if not (inspect.isfunction(val) or inspect.isclass(val) or

                        inspect.ismethod(val) or inspect.ismodule(val) or

                        isinstance(val, basestring)):

                    raise ValueError("DocTestFinder.find: __test__ values "

                                     "must be strings, functions, methods, "

                                     "classes, or modules: %r" %

                                     (type(val),))

                valname = '%s.__test__.%s' % (name, valname)

                self._find(tests, val, valname, module, source_lines,

                           globs, seen)



        # Look for tests in a class's contained objects.

        if inspect.isclass(obj) and self._recurse:

            for valname, val in obj.__dict__.items():

                # Special handling for staticmethod/classmethod.

                if isinstance(val, staticmethod):

                    val = getattr(obj, valname)

                if isinstance(val, classmethod):

                    val = getattr(obj, valname).im_func



                # Recurse to methods, properties, and nested classes.

                if ((inspect.isfunction(val) or inspect.isclass(val) or

                      isinstance(val, property)) and

                      self._from_module(module, val)):

                    valname = '%s.%s' % (name, valname)

                    self._find(tests, val, valname, module, source_lines,

                               globs, seen)



    def _get_test(self, obj, name, module, globs, source_lines):

        """

        Return a DocTest for the given object, if it defines a docstring;

        otherwise, return None.

        """

        # Extract the object's docstring.  If it doesn't have one,

        # then return None (no test for this object).

        if isinstance(obj, basestring):

            docstring = obj

        else:

            try:

                if obj.__doc__ is None:

                    docstring = ''

                else:

                    docstring = obj.__doc__

                    if not isinstance(docstring, basestring):

                        docstring = str(docstring)

            except (TypeError, AttributeError):

                docstring = ''



        # Find the docstring's location in the file.

        lineno = self._find_lineno(obj, source_lines)



        # Don't bother if the docstring is empty.

        if self._exclude_empty and not docstring:

            return None



        # Return a DocTest for this object.

        if module is None:

            filename = None

        else:

            filename = getattr(module, '__file__', module.__name__)

            if filename[-4:] in (".pyc", ".pyo"):

                filename = filename[:-1]

        return self._parser.get_doctest(docstring, globs, name,

                                        filename, lineno)



    def _find_lineno(self, obj, source_lines):

        """

        Return a line number of the given object's docstring.  Note:

        this method assumes that the object has a docstring.

        """

        lineno = None



        # Find the line number for modules.

        if inspect.ismodule(obj):

            lineno = 0



        # Find the line number for classes.

        # Note: this could be fooled if a class is defined multiple

        # times in a single file.

        if inspect.isclass(obj):

            if source_lines is None:

                return None

            pat = re.compile(r'^\s*class\s*%s\b' %

                             getattr(obj, '__name__', '-'))

            for i, line in enumerate(source_lines):

                if pat.match(line):

                    lineno = i

                    break



        # Find the line number for functions & methods.

        if inspect.ismethod(obj): obj = obj.im_func

        if inspect.isfunction(obj): obj = obj.func_code

        if inspect.istraceback(obj): obj = obj.tb_frame

        if inspect.isframe(obj): obj = obj.f_code

        if inspect.iscode(obj):

            lineno = getattr(obj, 'co_firstlineno', None)-1



        # Find the line number where the docstring starts.  Assume

        # that it's the first line that begins with a quote mark.

        # Note: this could be fooled by a multiline function

        # signature, where a continuation line begins with a quote

        # mark.

        if lineno is not None:

            if source_lines is None:

                return lineno+1

            pat = re.compile('(^|.*:)\s*\w*("|\')')

            for lineno in range(lineno, len(source_lines)):

                if pat.match(source_lines[lineno]):

                    return lineno



        # We couldn't find the line number.

        return None



######################################################################

## 5. DocTest Runner

######################################################################



class DocTestRunner:

    """

    A class used to run DocTest test cases, and accumulate statistics.

    The `run` method is used to process a single DocTest case.  It

    returns a tuple `(f, t)`, where `t` is the number of test cases

    tried, and `f` is the number of test cases that failed.



        >>> tests = DocTestFinder().find(_TestClass)

        >>> runner = DocTestRunner(verbose=False)

        >>> tests.sort(key = lambda test: test.name)

        >>> for test in tests:

        ...     print test.name, '->', runner.run(test)

        _TestClass -> TestResults(failed=0, attempted=2)

        _TestClass.__init__ -> TestResults(failed=0, attempted=2)

        _TestClass.get -> TestResults(failed=0, attempted=2)

        _TestClass.square -> TestResults(failed=0, attempted=1)



    The `summarize` method prints a summary of all the test cases that

    have been run by the runner, and returns an aggregated `(f, t)`

    tuple:



        >>> runner.summarize(verbose=1)

        4 items passed all tests:

           2 tests in _TestClass

           2 tests in _TestClass.__init__

           2 tests in _TestClass.get

           1 tests in _TestClass.square

        7 tests in 4 items.

        7 passed and 0 failed.

        Test passed.

        TestResults(failed=0, attempted=7)



    The aggregated number of tried examples and failed examples is

    also available via the `tries` and `failures` attributes:



        >>> runner.tries

        7

        >>> runner.failures

        0



    The comparison between expected outputs and actual outputs is done

    by an `OutputChecker`.  This comparison may be customized with a

    number of option flags; see the documentation for `testmod` for

    more information.  If the option flags are insufficient, then the

    comparison may also be customized by passing a subclass of

    `OutputChecker` to the constructor.



    The test runner's display output can be controlled in two ways.

    First, an output function (`out) can be passed to

    `TestRunner.run`; this function will be called with strings that

    should be displayed.  It defaults to `sys.stdout.write`.  If

    capturing the output is not sufficient, then the display output

    can be also customized by subclassing DocTestRunner, and

    overriding the methods `report_start`, `report_success`,

    `report_unexpected_exception`, and `report_failure`.

    """

    # This divider string is used to separate failure messages, and to

    # separate sections of the summary.

    DIVIDER = "*" * 70



    def __init__(self, checker=None, verbose=None, optionflags=0):

        """

        Create a new test runner.



        Optional keyword arg `checker` is the `OutputChecker` that

        should be used to compare the expected outputs and actual

        outputs of doctest examples.



        Optional keyword arg 'verbose' prints lots of stuff if true,

        only failures if false; by default, it's true iff '-v' is in

        sys.argv.



        Optional argument `optionflags` can be used to control how the

        test runner compares expected output to actual output, and how

        it displays failures.  See the documentation for `testmod` for

        more information.

        """

        self._checker = checker or OutputChecker()

        if verbose is None:

            verbose = '-v' in sys.argv

        self._verbose = verbose

        self.optionflags = optionflags

        self.original_optionflags = optionflags



        # Keep track of the examples we've run.

        self.tries = 0

        self.failures = 0

        self._name2ft = {}



        # Create a fake output target for capturing doctest output.

        self._fakeout = _SpoofOut()



    #/////////////////////////////////////////////////////////////////

    # Reporting methods

    #/////////////////////////////////////////////////////////////////



    def report_start(self, out, test, example):

        """

        Report that the test runner is about to process the given

        example.  (Only displays a message if verbose=True)

        """

        if self._verbose:

            if example.want:

                out('Trying:\n' + _indent(example.source) +

                    'Expecting:\n' + _indent(example.want))

            else:

                out('Trying:\n' + _indent(example.source) +

                    'Expecting nothing\n')



    def report_success(self, out, test, example, got):

        """

        Report that the given example ran successfully.  (Only

        displays a message if verbose=True)

        """

        if self._verbose:

            out("ok\n")



    def report_failure(self, out, test, example, got):

        """

        Report that the given example failed.

        """

        out(self._failure_header(test, example) +

            self._checker.output_difference(example, got, self.optionflags))



    def report_unexpected_exception(self, out, test, example, exc_info):

        """

        Report that the given example raised an unexpected exception.

        """

        out(self._failure_header(test, example) +

            'Exception raised:\n' + _indent(_exception_traceback(exc_info)))



    def _failure_header(self, test, example):

        out = [self.DIVIDER]

        if test.filename:

            if test.lineno is not None and example.lineno is not None:

                lineno = test.lineno + example.lineno + 1

            else:

                lineno = '?'

            out.append('File "%s", line %s, in %s' %

                       (test.filename, lineno, test.name))

        else:

            out.append('Line %s, in %s' % (example.lineno+1, test.name))

        out.append('Failed example:')

        source = example.source

        out.append(_indent(source))

        return '\n'.join(out)



    #/////////////////////////////////////////////////////////////////

    # DocTest Running

    #/////////////////////////////////////////////////////////////////



    def __run(self, test, compileflags, out):

        """

        Run the examples in `test`.  Write the outcome of each example

        with one of the `DocTestRunner.report_*` methods, using the

        writer function `out`.  `compileflags` is the set of compiler

        flags that should be used to execute examples.  Return a tuple

        `(f, t)`, where `t` is the number of examples tried, and `f`

        is the number of examples that failed.  The examples are run

        in the namespace `test.globs`.

        """

        # Keep track of the number of failures and tries.

        failures = tries = 0



        # Save the option flags (since option directives can be used

        # to modify them).

        original_optionflags = self.optionflags



        SUCCESS, FAILURE, BOOM = range(3) # `outcome` state



        check = self._checker.check_output



        # Process each example.

        for examplenum, example in enumerate(test.examples):



            # If REPORT_ONLY_FIRST_FAILURE is set, then supress

            # reporting after the first failure.

            quiet = (self.optionflags & REPORT_ONLY_FIRST_FAILURE and

                     failures > 0)



            # Merge in the example's options.

            self.optionflags = original_optionflags

            if example.options:

                for (optionflag, val) in example.options.items():

                    if val:

                        self.optionflags |= optionflag

                    else:

                        self.optionflags &= ~optionflag



            # If 'SKIP' is set, then skip this example.

            if self.optionflags & SKIP:

                continue



            # Record that we started this example.

            tries += 1

            if not quiet:

                self.report_start(out, test, example)



            # Use a special filename for compile(), so we can retrieve

            # the source code during interactive debugging (see

            # __patched_linecache_getlines).

            filename = '<doctest %s[%d]>' % (test.name, examplenum)



            # Run the example in the given context (globs), and record

            # any exception that gets raised.  (But don't intercept

            # keyboard interrupts.)

            try:

                # Don't blink!  This is where the user's code gets run.

                exec compile(example.source, filename, "single",

                             compileflags, 1) in test.globs

                self.debugger.set_continue() # ==== Example Finished ====

                exception = None

            except KeyboardInterrupt:

                raise

            except:

                exception = sys.exc_info()

                self.debugger.set_continue() # ==== Example Finished ====



            got = self._fakeout.getvalue()  # the actual output

            self._fakeout.truncate(0)

            outcome = FAILURE   # guilty until proved innocent or insane



            # If the example executed without raising any exceptions,

            # verify its output.

            if exception is None:

                if check(example.want, got, self.optionflags):

                    outcome = SUCCESS



            # The example raised an exception:  check if it was expected.

            else:

                exc_info = sys.exc_info()

                exc_msg = traceback.format_exception_only(*exc_info[:2])[-1]

                if not quiet:

                    got += _exception_traceback(exc_info)



                # If `example.exc_msg` is None, then we weren't expecting

                # an exception.

                if example.exc_msg is None:

                    outcome = BOOM



                # We expected an exception:  see whether it matches.

                elif check(example.exc_msg, exc_msg, self.optionflags):

                    outcome = SUCCESS



                # Another chance if they didn't care about the detail.

                elif self.optionflags & IGNORE_EXCEPTION_DETAIL:

                    m1 = re.match(r'[^:]*:', example.exc_msg)

                    m2 = re.match(r'[^:]*:', exc_msg)

                    if m1 and m2 and check(m1.group(0), m2.group(0),

                                           self.optionflags):

                        outcome = SUCCESS



            # Report the outcome.

            if outcome is SUCCESS:

                if not quiet:

                    self.report_success(out, test, example, got)

            elif outcome is FAILURE:

                if not quiet:

                    self.report_failure(out, test, example, got)

                failures += 1

            elif outcome is BOOM:

                if not quiet:

                    self.report_unexpected_exception(out, test, example,

                                                     exc_info)

                failures += 1

            else:

                assert False, ("unknown outcome", outcome)



        # Restore the option flags (in case they were modified)

        self.optionflags = original_optionflags



        # Record and return the number of failures and tries.

        self.__record_outcome(test, failures, tries)

        return TestResults(failures, tries)



    def __record_outcome(self, test, f, t):

        """

        Record the fact that the given DocTest (`test`) generated `f`

        failures out of `t` tried examples.

        """

        f2, t2 = self._name2ft.get(test.name, (0,0))

        self._name2ft[test.name] = (f+f2, t+t2)

        self.failures += f

        self.tries += t



    __LINECACHE_FILENAME_RE = re.compile(r'<doctest '

                                         r'(?P<name>[\w\.]+)'

                                         r'\[(?P<examplenum>\d+)\]>$')

    def __patched_linecache_getlines(self, filename, module_globals=None):

        m = self.__LINECACHE_FILENAME_RE.match(filename)

        if m and m.group('name') == self.test.name:

            example = self.test.examples[int(m.group('examplenum'))]

            return example.source.splitlines(True)

        else:

            return self.save_linecache_getlines(filename, module_globals)



    def run(self, test, compileflags=None, out=None, clear_globs=True):

        """

        Run the examples in `test`, and display the results using the

        writer function `out`.



        The examples are run in the namespace `test.globs`.  If

        `clear_globs` is true (the default), then this namespace will

        be cleared after the test runs, to help with garbage

        collection.  If you would like to examine the namespace after

        the test completes, then use `clear_globs=False`.



        `compileflags` gives the set of flags that should be used by

        the Python compiler when running the examples.  If not

        specified, then it will default to the set of future-import

        flags that apply to `globs`.



        The output of each example is checked using

        `DocTestRunner.check_output`, and the results are formatted by

        the `DocTestRunner.report_*` methods.

        """

        self.test = test



        if compileflags is None:

            compileflags = _extract_future_flags(test.globs)



        save_stdout = sys.stdout

        if out is None:

            out = save_stdout.write

        sys.stdout = self._fakeout



        # Patch pdb.set_trace to restore sys.stdout during interactive

        # debugging (so it's not still redirected to self._fakeout).

        # Note that the interactive output will go to *our*

        # save_stdout, even if that's not the real sys.stdout; this

        # allows us to write test cases for the set_trace behavior.

        save_set_trace = pdb.set_trace

        self.debugger = _OutputRedirectingPdb(save_stdout)

        self.debugger.reset()

        pdb.set_trace = self.debugger.set_trace



        # Patch linecache.getlines, so we can see the example's source

        # when we're inside the debugger.

        self.save_linecache_getlines = linecache.getlines

        linecache.getlines = self.__patched_linecache_getlines



        try:

            return self.__run(test, compileflags, out)

        finally:

            sys.stdout = save_stdout

            pdb.set_trace = save_set_trace

            linecache.getlines = self.save_linecache_getlines

            if clear_globs:

                test.globs.clear()



    #/////////////////////////////////////////////////////////////////

    # Summarization

    #/////////////////////////////////////////////////////////////////

    def summarize(self, verbose=None):

        """

        Print a summary of all the test cases that have been run by

        this DocTestRunner, and return a tuple `(f, t)`, where `f` is

        the total number of failed examples, and `t` is the total

        number of tried examples.



        The optional `verbose` argument controls how detailed the

        summary is.  If the verbosity is not specified, then the

        DocTestRunner's verbosity is used.

        """

        if verbose is None:

            verbose = self._verbose

        notests = []

        passed = []

        failed = []

        totalt = totalf = 0

        for x in self._name2ft.items():

            name, (f, t) = x

            assert f <= t

            totalt += t

            totalf += f

            if t == 0:

                notests.append(name)

            elif f == 0:

                passed.append( (name, t) )

            else:

                failed.append(x)

        if verbose:

            if notests:

                print len(notests), "items had no tests:"

                notests.sort()

                for thing in notests:

                    print "   ", thing

            if passed:

                print len(passed), "items passed all tests:"

                passed.sort()

                for thing, count in passed:

                    print " %3d tests in %s" % (count, thing)

        if failed:

            print self.DIVIDER

            print len(failed), "items had failures:"

            failed.sort()

            for thing, (f, t) in failed:

                print " %3d of %3d in %s" % (f, t, thing)

        if verbose:

            print totalt, "tests in", len(self._name2ft), "items."

            print totalt - totalf, "passed and", totalf, "failed."

        if totalf:

            print "***Test Failed***", totalf, "failures."

        elif verbose:

            print "Test passed."

        return TestResults(totalf, totalt)



    #/////////////////////////////////////////////////////////////////

    # Backward compatibility cruft to maintain doctest.master.

    #/////////////////////////////////////////////////////////////////

    def merge(self, other):

        d = self._name2ft

        for name, (f, t) in other._name2ft.items():

            if name in d:

                # Don't print here by default, since doing

                #     so breaks some of the buildbots

                #print "*** DocTestRunner.merge: '" + name + "' in both" \

                #    " testers; summing outcomes."

                f2, t2 = d[name]

                f = f + f2

                t = t + t2

            d[name] = f, t



class OutputChecker:

    """

    A class used to check the whether the actual output from a doctest

    example matches the expected output.  `OutputChecker` defines two

    methods: `check_output`, which compares a given pair of outputs,

    and returns true if they match; and `output_difference`, which

    returns a string describing the differences between two outputs.

    """

    def check_output(self, want, got, optionflags):

        """

        Return True iff the actual output from an example (`got`)

        matches the expected output (`want`).  These strings are

        always considered to match if they are identical; but

        depending on what option flags the test runner is using,

        several non-exact match types are also possible.  See the

        documentation for `TestRunner` for more information about

        option flags.

        """

        # Handle the common case first, for efficiency:

        # if they're string-identical, always return true.

        if got == want:

            return True



        # The values True and False replaced 1 and 0 as the return

        # value for boolean comparisons in Python 2.3.

        if not (optionflags & DONT_ACCEPT_TRUE_FOR_1):

            if (got,want) == ("True\n", "1\n"):

                return True

            if (got,want) == ("False\n", "0\n"):

                return True



        # <BLANKLINE> can be used as a special sequence to signify a

        # blank line, unless the DONT_ACCEPT_BLANKLINE flag is used.

        if not (optionflags & DONT_ACCEPT_BLANKLINE):

            # Replace <BLANKLINE> in want with a blank line.

            want = re.sub('(?m)^%s\s*?$' % re.escape(BLANKLINE_MARKER),

                          '', want)

            # If a line in got contains only spaces, then remove the

            # spaces.

            got = re.sub('(?m)^\s*?$', '', got)

            if got == want:

                return True



        # This flag causes doctest to ignore any differences in the

        # contents of whitespace strings.  Note that this can be used

        # in conjunction with the ELLIPSIS flag.

        if optionflags & NORMALIZE_WHITESPACE:

            got = ' '.join(got.split())

            want = ' '.join(want.split())

            if got == want:

                return True



        # The ELLIPSIS flag says to let the sequence "..." in `want`

        # match any substring in `got`.

        if optionflags & ELLIPSIS:

            if _ellipsis_match(want, got):

                return True



        # We didn't find any match; return false.

        return False



    # Should we do a fancy diff?

    def _do_a_fancy_diff(self, want, got, optionflags):

        # Not unless they asked for a fancy diff.

        if not optionflags & (REPORT_UDIFF |

                              REPORT_CDIFF |

                              REPORT_NDIFF):

            return False



        # If expected output uses ellipsis, a meaningful fancy diff is

        # too hard ... or maybe not.  In two real-life failures Tim saw,

        # a diff was a major help anyway, so this is commented out.

        # [todo] _ellipsis_match() knows which pieces do and don't match,

        # and could be the basis for a kick-ass diff in this case.

        ##if optionflags & ELLIPSIS and ELLIPSIS_MARKER in want:

        ##    return False



        # ndiff does intraline difference marking, so can be useful even

        # for 1-line differences.

        if optionflags & REPORT_NDIFF:

            return True



        # The other diff types need at least a few lines to be helpful.

        return want.count('\n') > 2 and got.count('\n') > 2



    def output_difference(self, example, got, optionflags):

        """

        Return a string describing the differences between the

        expected output for a given example (`example`) and the actual

        output (`got`).  `optionflags` is the set of option flags used

        to compare `want` and `got`.

        """

        want = example.want

        # If <BLANKLINE>s are being used, then replace blank lines

        # with <BLANKLINE> in the actual output string.

        if not (optionflags & DONT_ACCEPT_BLANKLINE):

            got = re.sub('(?m)^[ ]*(?=\n)', BLANKLINE_MARKER, got)



        # Check if we should use diff.

        if self._do_a_fancy_diff(want, got, optionflags):

            # Split want & got into lines.

            want_lines = want.splitlines(True)  # True == keep line ends

            got_lines = got.splitlines(True)

            # Use difflib to find their differences.

            if optionflags & REPORT_UDIFF:

                diff = difflib.unified_diff(want_lines, got_lines, n=2)

                diff = list(diff)[2:] # strip the diff header

                kind = 'unified diff with -expected +actual'

            elif optionflags & REPORT_CDIFF:

                diff = difflib.context_diff(want_lines, got_lines, n=2)

                diff = list(diff)[2:] # strip the diff header

                kind = 'context diff with expected followed by actual'

            elif optionflags & REPORT_NDIFF:

                engine = difflib.Differ(charjunk=difflib.IS_CHARACTER_JUNK)

                diff = list(engine.compare(want_lines, got_lines))

                kind = 'ndiff with -expected +actual'

            else:

                assert 0, 'Bad diff option'

            # Remove trailing whitespace on diff output.

            diff = [line.rstrip() + '\n' for line in diff]

            return 'Differences (%s):\n' % kind + _indent(''.join(diff))



        # If we're not using diff, then simply list the expected

        # output followed by the actual output.

        if want and got:

            return 'Expected:\n%sGot:\n%s' % (_indent(want), _indent(got))

        elif want:

            return 'Expected:\n%sGot nothing\n' % _indent(want)

        elif got:

            return 'Expected nothing\nGot:\n%s' % _indent(got)

        else:

            return 'Expected nothing\nGot nothing\n'



class DocTestFailure(Exception):

    """A DocTest example has failed in debugging mode.



    The exception instance has variables:



    - test: the DocTest object being run



    - example: the Example object that failed



    - got: the actual output

    """

    def __init__(self, test, example, got):

        self.test = test

        self.example = example

        self.got = got



    def __str__(self):

        return str(self.test)



class UnexpectedException(Exception):

    """A DocTest example has encountered an unexpected exception



    The exception instance has variables:



    - test: the DocTest object being run



    - example: the Example object that failed



    - exc_info: the exception info

    """

    def __init__(self, test, example, exc_info):

        self.test = test

        self.example = example

        self.exc_info = exc_info



    def __str__(self):

        return str(self.test)



class DebugRunner(DocTestRunner):

    r"""Run doc tests but raise an exception as soon as there is a failure.



       If an unexpected exception occurs, an UnexpectedException is raised.

       It contains the test, the example, and the original exception:



         >>> runner = DebugRunner(verbose=False)

         >>> test = DocTestParser().get_doctest('>>> raise KeyError\n42',

         ...                                    {}, 'foo', 'foo.py', 0)

         >>> try:

         ...     runner.run(test)

         ... except UnexpectedException, failure:

         ...     pass



         >>> failure.test is test

         True



         >>> failure.example.want

         '42\n'



         >>> exc_info = failure.exc_info

         >>> raise exc_info[0], exc_info[1], exc_info[2]

         Traceback (most recent call last):

         ...

         KeyError



       We wrap the original exception to give the calling application

       access to the test and example information.



       If the output doesn't match, then a DocTestFailure is raised:



         >>> test = DocTestParser().get_doctest('''

         ...      >>> x = 1

         ...      >>> x

         ...      2

         ...      ''', {}, 'foo', 'foo.py', 0)



         >>> try:

         ...    runner.run(test)

         ... except DocTestFailure, failure:

         ...    pass



       DocTestFailure objects provide access to the test:



         >>> failure.test is test

         True



       As well as to the example:



         >>> failure.example.want

         '2\n'



       and the actual output:



         >>> failure.got

         '1\n'



       If a failure or error occurs, the globals are left intact:



         >>> del test.globs['__builtins__']

         >>> test.globs

         {'x': 1}



         >>> test = DocTestParser().get_doctest('''

         ...      >>> x = 2

         ...      >>> raise KeyError

         ...      ''', {}, 'foo', 'foo.py', 0)



         >>> runner.run(test)

         Traceback (most recent call last):

         ...

         UnexpectedException: <DocTest foo from foo.py:0 (2 examples)>



         >>> del test.globs['__builtins__']

         >>> test.globs

         {'x': 2}



       But the globals are cleared if there is no error:



         >>> test = DocTestParser().get_doctest('''

         ...      >>> x = 2

         ...      ''', {}, 'foo', 'foo.py', 0)



         >>> runner.run(test)

         TestResults(failed=0, attempted=1)



         >>> test.globs

         {}



       """



    def run(self, test, compileflags=None, out=None, clear_globs=True):

        r = DocTestRunner.run(self, test, compileflags, out, False)

        if clear_globs:

            test.globs.clear()

        return r



    def report_unexpected_exception(self, out, test, example, exc_info):

        raise UnexpectedException(test, example, exc_info)



    def report_failure(self, out, test, example, got):

        raise DocTestFailure(test, example, got)



######################################################################

## 6. Test Functions

######################################################################

# These should be backwards compatible.



# For backward compatibility, a global instance of a DocTestRunner

# class, updated by testmod.

master = None



def testmod(m=None, name=None, globs=None, verbose=None,

            report=True, optionflags=0, extraglobs=None,

            raise_on_error=False, exclude_empty=False):

    """m=None, name=None, globs=None, verbose=None, report=True,

       optionflags=0, extraglobs=None, raise_on_error=False,

       exclude_empty=False



    Test examples in docstrings in functions and classes reachable

    from module m (or the current module if m is not supplied), starting

    with m.__doc__.



    Also test examples reachable from dict m.__test__ if it exists and is

    not None.  m.__test__ maps names to functions, classes and strings;

    function and class docstrings are tested even if the name is private;

    strings are tested directly, as if they were docstrings.



    Return (#failures, #tests).



    See doctest.__doc__ for an overview.



    Optional keyword arg "name" gives the name of the module; by default

    use m.__name__.



    Optional keyword arg "globs" gives a dict to be used as the globals

    when executing examples; by default, use m.__dict__.  A copy of this

    dict is actually used for each docstring, so that each docstring's

    examples start with a clean slate.



    Optional keyword arg "extraglobs" gives a dictionary that should be

    merged into the globals that are used to execute examples.  By

    default, no extra globals are used.  This is new in 2.4.



    Optional keyword arg "verbose" prints lots of stuff if true, prints

    only failures if false; by default, it's true iff "-v" is in sys.argv.



    Optional keyword arg "report" prints a summary at the end when true,

    else prints nothing at the end.  In verbose mode, the summary is

    detailed, else very brief (in fact, empty if all tests passed).



    Optional keyword arg "optionflags" or's together module constants,

    and defaults to 0.  This is new in 2.3.  Possible values (see the

    docs for details):



        DONT_ACCEPT_TRUE_FOR_1

        DONT_ACCEPT_BLANKLINE

        NORMALIZE_WHITESPACE

        ELLIPSIS

        SKIP

        IGNORE_EXCEPTION_DETAIL

        REPORT_UDIFF

        REPORT_CDIFF

        REPORT_NDIFF

        REPORT_ONLY_FIRST_FAILURE



    Optional keyword arg "raise_on_error" raises an exception on the

    first unexpected exception or failure. This allows failures to be

    post-mortem debugged.



    Advanced tomfoolery:  testmod runs methods of a local instance of

    class doctest.Tester, then merges the results into (or creates)

    global Tester instance doctest.master.  Methods of doctest.master

    can be called directly too, if you want to do something unusual.

    Passing report=0 to testmod is especially useful then, to delay

    displaying a summary.  Invoke doctest.master.summarize(verbose)

    when you're done fiddling.

    """

    global master



    # If no module was given, then use __main__.

    if m is None:

        # DWA - m will still be None if this wasn't invoked from the command

        # line, in which case the following TypeError is about as good an error

        # as we should expect

        m = sys.modules.get('__main__')



    # Check that we were actually given a module.

    if not inspect.ismodule(m):

        raise TypeError("testmod: module required; %r" % (m,))



    # If no name was given, then use the module's name.

    if name is None:

        name = m.__name__



    # Find, parse, and run all tests in the given module.

    finder = DocTestFinder(exclude_empty=exclude_empty)



    if raise_on_error:

        runner = DebugRunner(verbose=verbose, optionflags=optionflags)

    else:

        runner = DocTestRunner(verbose=verbose, optionflags=optionflags)



    for test in finder.find(m, name, globs=globs, extraglobs=extraglobs):

        runner.run(test)



    if report:

        runner.summarize()



    if master is None:

        master = runner

    else:

        master.merge(runner)



    return TestResults(runner.failures, runner.tries)



def testfile(filename, module_relative=True, name=None, package=None,

             globs=None, verbose=None, report=True, optionflags=0,

             extraglobs=None, raise_on_error=False, parser=DocTestParser(),

             encoding=None):

    """

    Test examples in the given file.  Return (#failures, #tests).



    Optional keyword arg "module_relative" specifies how filenames

    should be interpreted:



      - If "module_relative" is True (the default), then "filename"

         specifies a module-relative path.  By default, this path is

         relative to the calling module's directory; but if the

         "package" argument is specified, then it is relative to that

         package.  To ensure os-independence, "filename" should use

         "/" characters to separate path segments, and should not

         be an absolute path (i.e., it may not begin with "/").



      - If "module_relative" is False, then "filename" specifies an

        os-specific path.  The path may be absolute or relative (to

        the current working directory).



    Optional keyword arg "name" gives the name of the test; by default

    use the file's basename.



    Optional keyword argument "package" is a Python package or the

    name of a Python package whose directory should be used as the

    base directory for a module relative filename.  If no package is

    specified, then the calling module's directory is used as the base

    directory for module relative filenames.  It is an error to

    specify "package" if "module_relative" is False.



    Optional keyword arg "globs" gives a dict to be used as the globals

    when executing examples; by default, use {}.  A copy of this dict

    is actually used for each docstring, so that each docstring's

    examples start with a clean slate.



    Optional keyword arg "extraglobs" gives a dictionary that should be

    merged into the globals that are used to execute examples.  By

    default, no extra globals are used.



    Optional keyword arg "verbose" prints lots of stuff if true, prints

    only failures if false; by default, it's true iff "-v" is in sys.argv.



    Optional keyword arg "report" prints a summary at the end when true,

    else prints nothing at the end.  In verbose mode, the summary is

    detailed, else very brief (in fact, empty if all tests passed).



    Optional keyword arg "optionflags" or's together module constants,

    and defaults to 0.  Possible values (see the docs for details):



        DONT_ACCEPT_TRUE_FOR_1

        DONT_ACCEPT_BLANKLINE

        NORMALIZE_WHITESPACE

        ELLIPSIS

        SKIP

        IGNORE_EXCEPTION_DETAIL

        REPORT_UDIFF

        REPORT_CDIFF

        REPORT_NDIFF

        REPORT_ONLY_FIRST_FAILURE



    Optional keyword arg "raise_on_error" raises an exception on the

    first unexpected exception or failure. This allows failures to be

    post-mortem debugged.



    Optional keyword arg "parser" specifies a DocTestParser (or

    subclass) that should be used to extract tests from the files.



    Optional keyword arg "encoding" specifies an encoding that should

    be used to convert the file to unicode.



    Advanced tomfoolery:  testmod runs methods of a local instance of

    class doctest.Tester, then merges the results into (or creates)

    global Tester instance doctest.master.  Methods of doctest.master

    can be called directly too, if you want to do something unusual.

    Passing report=0 to testmod is especially useful then, to delay

    displaying a summary.  Invoke doctest.master.summarize(verbose)

    when you're done fiddling.

    """

    global master



    if package and not module_relative:

        raise ValueError("Package may only be specified for module-"

                         "relative paths.")



    # Relativize the path

    text, filename = _load_testfile(filename, package, module_relative)



    # If no name was given, then use the file's name.

    if name is None:

        name = os.path.basename(filename)



    # Assemble the globals.

    if globs is None:

        globs = {}

    else:

        globs = globs.copy()

    if extraglobs is not None:

        globs.update(extraglobs)

    if '__name__' not in globs:

        globs['__name__'] = '__main__'



    if raise_on_error:

        runner = DebugRunner(verbose=verbose, optionflags=optionflags)

    else:

        runner = DocTestRunner(verbose=verbose, optionflags=optionflags)



    if encoding is not None:

        text = text.decode(encoding)



    # Read the file, convert it to a test, and run it.

    test = parser.get_doctest(text, globs, name, filename, 0)

    runner.run(test)



    if report:

        runner.summarize()



    if master is None:

        master = runner

    else:

        master.merge(runner)



    return TestResults(runner.failures, runner.tries)



def run_docstring_examples(f, globs, verbose=False, name="NoName",

                           compileflags=None, optionflags=0):

    """

    Test examples in the given object's docstring (`f`), using `globs`

    as globals.  Optional argument `name` is used in failure messages.

    If the optional argument `verbose` is true, then generate output

    even if there are no failures.



    `compileflags` gives the set of flags that should be used by the

    Python compiler when running the examples.  If not specified, then

    it will default to the set of future-import flags that apply to

    `globs`.



    Optional keyword arg `optionflags` specifies options for the

    testing and output.  See the documentation for `testmod` for more

    information.

    """

    # Find, parse, and run all tests in the given module.

    finder = DocTestFinder(verbose=verbose, recurse=False)

    runner = DocTestRunner(verbose=verbose, optionflags=optionflags)

    for test in finder.find(f, name, globs=globs):

        runner.run(test, compileflags=compileflags)



######################################################################

## 7. Tester

######################################################################

# This is provided only for backwards compatibility.  It's not

# actually used in any way.



class Tester:

    def __init__(self, mod=None, globs=None, verbose=None, optionflags=0):



        warnings.warn("class Tester is deprecated; "

                      "use class doctest.DocTestRunner instead",

                      DeprecationWarning, stacklevel=2)

        if mod is None and globs is None:

            raise TypeError("Tester.__init__: must specify mod or globs")

        if mod is not None and not inspect.ismodule(mod):

            raise TypeError("Tester.__init__: mod must be a module; %r" %

                            (mod,))

        if globs is None:

            globs = mod.__dict__

        self.globs = globs



        self.verbose = verbose

        self.optionflags = optionflags

        self.testfinder = DocTestFinder()

        self.testrunner = DocTestRunner(verbose=verbose,

                                        optionflags=optionflags)



    def runstring(self, s, name):

        test = DocTestParser().get_doctest(s, self.globs, name, None, None)

        if self.verbose:

            print "Running string", name

        (f,t) = self.testrunner.run(test)

        if self.verbose:

            print f, "of", t, "examples failed in string", name

        return TestResults(f,t)



    def rundoc(self, object, name=None, module=None):

        f = t = 0

        tests = self.testfinder.find(object, name, module=module,

                                     globs=self.globs)

        for test in tests:

            (f2, t2) = self.testrunner.run(test)

            (f,t) = (f+f2, t+t2)

        return TestResults(f,t)



    def rundict(self, d, name, module=None):

        import types

        m = types.ModuleType(name)

        m.__dict__.update(d)

        if module is None:

            module = False

        return self.rundoc(m, name, module)



    def run__test__(self, d, name):

        import types

        m = types.ModuleType(name)

        m.__test__ = d

        return self.rundoc(m, name)



    def summarize(self, verbose=None):

        return self.testrunner.summarize(verbose)



    def merge(self, other):

        self.testrunner.merge(other.testrunner)



######################################################################

## 8. Unittest Support

######################################################################



_unittest_reportflags = 0



def set_unittest_reportflags(flags):

    """Sets the unittest option flags.



    The old flag is returned so that a runner could restore the old

    value if it wished to:



      >>> import doctest

      >>> old = doctest._unittest_reportflags

      >>> doctest.set_unittest_reportflags(REPORT_NDIFF |

      ...                          REPORT_ONLY_FIRST_FAILURE) == old

      True



      >>> doctest._unittest_reportflags == (REPORT_NDIFF |

      ...                                   REPORT_ONLY_FIRST_FAILURE)

      True



    Only reporting flags can be set:



      >>> doctest.set_unittest_reportflags(ELLIPSIS)

      Traceback (most recent call last):

      ...

      ValueError: ('Only reporting flags allowed', 8)



      >>> doctest.set_unittest_reportflags(old) == (REPORT_NDIFF |

      ...                                   REPORT_ONLY_FIRST_FAILURE)

      True

    """

    global _unittest_reportflags



    if (flags & REPORTING_FLAGS) != flags:

        raise ValueError("Only reporting flags allowed", flags)

    old = _unittest_reportflags

    _unittest_reportflags = flags

    return old





class DocTestCase(unittest.TestCase):



    def __init__(self, test, optionflags=0, setUp=None, tearDown=None,

                 checker=None):



        unittest.TestCase.__init__(self)

        self._dt_optionflags = optionflags

        self._dt_checker = checker

        self._dt_test = test

        self._dt_setUp = setUp

        self._dt_tearDown = tearDown



    def setUp(self):

        test = self._dt_test



        if self._dt_setUp is not None:

            self._dt_setUp(test)



    def tearDown(self):

        test = self._dt_test



        if self._dt_tearDown is not None:

            self._dt_tearDown(test)



        test.globs.clear()



    def runTest(self):

        test = self._dt_test

        old = sys.stdout

        new = StringIO()

        optionflags = self._dt_optionflags



        if not (optionflags & REPORTING_FLAGS):

            # The option flags don't include any reporting flags,

            # so add the default reporting flags

            optionflags |= _unittest_reportflags



        runner = DocTestRunner(optionflags=optionflags,

                               checker=self._dt_checker, verbose=False)



        try:

            runner.DIVIDER = "-"*70

            failures, tries = runner.run(

                test, out=new.write, clear_globs=False)

        finally:

            sys.stdout = old



        if failures:

            raise self.failureException(self.format_failure(new.getvalue()))



    def format_failure(self, err):

        test = self._dt_test

        if test.lineno is None:

            lineno = 'unknown line number'

        else:

            lineno = '%s' % test.lineno

        lname = '.'.join(test.name.split('.')[-1:])

        return ('Failed doctest test for %s\n'

                '  File "%s", line %s, in %s\n\n%s'

                % (test.name, test.filename, lineno, lname, err)

                )



    def debug(self):

        r"""Run the test case without results and without catching exceptions



           The unit test framework includes a debug method on test cases

           and test suites to support post-mortem debugging.  The test code

           is run in such a way that errors are not caught.  This way a

           caller can catch the errors and initiate post-mortem debugging.



           The DocTestCase provides a debug method that raises

           UnexpectedException errors if there is an unexepcted

           exception:



             >>> test = DocTestParser().get_doctest('>>> raise KeyError\n42',

             ...                {}, 'foo', 'foo.py', 0)

             >>> case = DocTestCase(test)

             >>> try:

             ...     case.debug()

             ... except UnexpectedException, failure:

             ...     pass



           The UnexpectedException contains the test, the example, and

           the original exception:



             >>> failure.test is test

             True



             >>> failure.example.want

             '42\n'



             >>> exc_info = failure.exc_info

             >>> raise exc_info[0], exc_info[1], exc_info[2]

             Traceback (most recent call last):

             ...

             KeyError



           If the output doesn't match, then a DocTestFailure is raised:



             >>> test = DocTestParser().get_doctest('''

             ...      >>> x = 1

             ...      >>> x

             ...      2

             ...      ''', {}, 'foo', 'foo.py', 0)

             >>> case = DocTestCase(test)



             >>> try:

             ...    case.debug()

             ... except DocTestFailure, failure:

             ...    pass



           DocTestFailure objects provide access to the test:



             >>> failure.test is test

             True



           As well as to the example:



             >>> failure.example.want

             '2\n'



           and the actual output:



             >>> failure.got

             '1\n'



           """



        self.setUp()

        runner = DebugRunner(optionflags=self._dt_optionflags,

                             checker=self._dt_checker, verbose=False)

        runner.run(self._dt_test, clear_globs=False)

        self.tearDown()



    def id(self):

        return self._dt_test.name



    def __repr__(self):

        name = self._dt_test.name.split('.')

        return "%s (%s)" % (name[-1], '.'.join(name[:-1]))



    __str__ = __repr__



    def shortDescription(self):

        return "Doctest: " + self._dt_test.name



def DocTestSuite(module=None, globs=None, extraglobs=None, test_finder=None,

                 **options):

    """

    Convert doctest tests for a module to a unittest test suite.



    This converts each documentation string in a module that

    contains doctest tests to a unittest test case.  If any of the

    tests in a doc string fail, then the test case fails.  An exception

    is raised showing the name of the file containing the test and a

    (sometimes approximate) line number.



    The `module` argument provides the module to be tested.  The argument

    can be either a module or a module name.



    If no argument is given, the calling module is used.



    A number of options may be provided as keyword arguments:



    setUp

      A set-up function.  This is called before running the

      tests in each file. The setUp function will be passed a DocTest

      object.  The setUp function can access the test globals as the

      globs attribute of the test passed.



    tearDown

      A tear-down function.  This is called after running the

      tests in each file.  The tearDown function will be passed a DocTest

      object.  The tearDown function can access the test globals as the

      globs attribute of the test passed.



    globs

      A dictionary containing initial global variables for the tests.



    optionflags

       A set of doctest option flags expressed as an integer.

    """



    if test_finder is None:

        test_finder = DocTestFinder()



    module = _normalize_module(module)

    tests = test_finder.find(module, globs=globs, extraglobs=extraglobs)

    if not tests:

        # Why do we want to do this? Because it reveals a bug that might

        # otherwise be hidden.

        raise ValueError(module, "has no tests")



    tests.sort()

    suite = unittest.TestSuite()

    for test in tests:

        if len(test.examples) == 0:

            continue

        if not test.filename:

            filename = module.__file__

            if filename[-4:] in (".pyc", ".pyo"):

                filename = filename[:-1]

            test.filename = filename

        suite.addTest(DocTestCase(test, **options))



    return suite



class DocFileCase(DocTestCase):



    def id(self):

        return '_'.join(self._dt_test.name.split('.'))



    def __repr__(self):

        return self._dt_test.filename

    __str__ = __repr__



    def format_failure(self, err):

        return ('Failed doctest test for %s\n  File "%s", line 0\n\n%s'

                % (self._dt_test.name, self._dt_test.filename, err)

                )



def DocFileTest(path, module_relative=True, package=None,

                globs=None, parser=DocTestParser(),

                encoding=None, **options):

    if globs is None:

        globs = {}

    else:

        globs = globs.copy()



    if package and not module_relative:

        raise ValueError("Package may only be specified for module-"

                         "relative paths.")



    # Relativize the path.

    doc, path = _load_testfile(path, package, module_relative)



    if "__file__" not in globs:

        globs["__file__"] = path



    # Find the file and read it.

    name = os.path.basename(path)



    # If an encoding is specified, use it to convert the file to unicode

    if encoding is not None:

        doc = doc.decode(encoding)



    # Convert it to a test, and wrap it in a DocFileCase.

    test = parser.get_doctest(doc, globs, name, path, 0)

    return DocFileCase(test, **options)



def DocFileSuite(*paths, **kw):

    """A unittest suite for one or more doctest files.



    The path to each doctest file is given as a string; the

    interpretation of that string depends on the keyword argument

    "module_relative".



    A number of options may be provided as keyword arguments:



    module_relative

      If "module_relative" is True, then the given file paths are

      interpreted as os-independent module-relative paths.  By

      default, these paths are relative to the calling module's

      directory; but if the "package" argument is specified, then

      they are relative to that package.  To ensure os-independence,

      "filename" should use "/" characters to separate path

      segments, and may not be an absolute path (i.e., it may not

      begin with "/").



      If "module_relative" is False, then the given file paths are

      interpreted as os-specific paths.  These paths may be absolute

      or relative (to the current working directory).



    package

      A Python package or the name of a Python package whose directory

      should be used as the base directory for module relative paths.

      If "package" is not specified, then the calling module's

      directory is used as the base directory for module relative

      filenames.  It is an error to specify "package" if

      "module_relative" is False.



    setUp

      A set-up function.  This is called before running the

      tests in each file. The setUp function will be passed a DocTest

      object.  The setUp function can access the test globals as the

      globs attribute of the test passed.



    tearDown

      A tear-down function.  This is called after running the

      tests in each file.  The tearDown function will be passed a DocTest

      object.  The tearDown function can access the test globals as the

      globs attribute of the test passed.



    globs

      A dictionary containing initial global variables for the tests.



    optionflags

      A set of doctest option flags expressed as an integer.



    parser

      A DocTestParser (or subclass) that should be used to extract

      tests from the files.



    encoding

      An encoding that will be used to convert the files to unicode.

    """

    suite = unittest.TestSuite()



    # We do this here so that _normalize_module is called at the right

    # level.  If it were called in DocFileTest, then this function

    # would be the caller and we might guess the package incorrectly.

    if kw.get('module_relative', True):

        kw['package'] = _normalize_module(kw.get('package'))



    for path in paths:

        suite.addTest(DocFileTest(path, **kw))



    return suite



######################################################################

## 9. Debugging Support

######################################################################



def script_from_examples(s):

    r"""Extract script from text with examples.



       Converts text with examples to a Python script.  Example input is

       converted to regular code.  Example output and all other words

       are converted to comments:



       >>> text = '''

       ...       Here are examples of simple math.

       ...

       ...           Python has super accurate integer addition

       ...

       ...           >>> 2 + 2

       ...           5

       ...

       ...           And very friendly error messages:

       ...

       ...           >>> 1/0

       ...           To Infinity

       ...           And

       ...           Beyond

       ...

       ...           You can use logic if you want:

       ...

       ...           >>> if 0:

       ...           ...    blah

       ...           ...    blah

       ...           ...

       ...

       ...           Ho hum

       ...           '''



       >>> print script_from_examples(text)

       # Here are examples of simple math.

       #

       #     Python has super accurate integer addition

       #

       2 + 2

       # Expected:

       ## 5

       #

       #     And very friendly error messages:

       #

       1/0

       # Expected:

       ## To Infinity

       ## And

       ## Beyond

       #

       #     You can use logic if you want:

       #

       if 0:

          blah

          blah

       #

       #     Ho hum

       <BLANKLINE>

       """

    output = []

    for piece in DocTestParser().parse(s):

        if isinstance(piece, Example):

            # Add the example's source code (strip trailing NL)

            output.append(piece.source[:-1])

            # Add the expected output:

            want = piece.want

            if want:

                output.append('# Expected:')

                output += ['## '+l for l in want.split('\n')[:-1]]

        else:

            # Add non-example text.

            output += [_comment_line(l)

                       for l in piece.split('\n')[:-1]]



    # Trim junk on both ends.

    while output and output[-1] == '#':

        output.pop()

    while output and output[0] == '#':

        output.pop(0)

    # Combine the output, and return it.

    # Add a courtesy newline to prevent exec from choking (see bug #1172785)

    return '\n'.join(output) + '\n'



def testsource(module, name):

    """Extract the test sources from a doctest docstring as a script.



    Provide the module (or dotted name of the module) containing the

    test to be debugged and the name (within the module) of the object

    with the doc string with tests to be debugged.

    """

    module = _normalize_module(module)

    tests = DocTestFinder().find(module)

    test = [t for t in tests if t.name == name]

    if not test:

        raise ValueError(name, "not found in tests")

    test = test[0]

    testsrc = script_from_examples(test.docstring)

    return testsrc



def debug_src(src, pm=False, globs=None):

    """Debug a single doctest docstring, in argument `src`'"""

    testsrc = script_from_examples(src)

    debug_script(testsrc, pm, globs)



def debug_script(src, pm=False, globs=None):

    "Debug a test script.  `src` is the script, as a string."

    import pdb



    # Note that tempfile.NameTemporaryFile() cannot be used.  As the

    # docs say, a file so created cannot be opened by name a second time

    # on modern Windows boxes, and execfile() needs to open it.

    srcfilename = tempfile.mktemp(".py", "doctestdebug")

    f = open(srcfilename, 'w')

    f.write(src)

    f.close()



    try:

        if globs:

            globs = globs.copy()

        else:

            globs = {}



        if pm:

            try:

                execfile(srcfilename, globs, globs)

            except:

                print sys.exc_info()[1]

                pdb.post_mortem(sys.exc_info()[2])

        else:

            # Note that %r is vital here.  '%s' instead can, e.g., cause

            # backslashes to get treated as metacharacters on Windows.

            pdb.run("execfile(%r)" % srcfilename, globs, globs)



    finally:

        os.remove(srcfilename)



def debug(module, name, pm=False):

    """Debug a single doctest docstring.



    Provide the module (or dotted name of the module) containing the

    test to be debugged and the name (within the module) of the object

    with the docstring with tests to be debugged.

    """

    module = _normalize_module(module)

    testsrc = testsource(module, name)

    debug_script(testsrc, pm, module.__dict__)



######################################################################

## 10. Example Usage

######################################################################

class _TestClass:

    """

    A pointless class, for sanity-checking of docstring testing.



    Methods:

        square()

        get()



    >>> _TestClass(13).get() + _TestClass(-12).get()

    1

    >>> hex(_TestClass(13).square().get())

    '0xa9'

    """



    def __init__(self, val):

        """val -> _TestClass object with associated value val.



        >>> t = _TestClass(123)

        >>> print t.get()

        123

        """



        self.val = val



    def square(self):

        """square() -> square TestClass's associated value



        >>> _TestClass(13).square().get()

        169

        """



        self.val = self.val ** 2

        return self



    def get(self):

        """get() -> return TestClass's associated value.



        >>> x = _TestClass(-42)

        >>> print x.get()

        -42

        """



        return self.val



__test__ = {"_TestClass": _TestClass,

            "string": r"""

                      Example of a string object, searched as-is.

                      >>> x = 1; y = 2

                      >>> x + y, x * y

                      (3, 2)

                      """,



            "bool-int equivalence": r"""

                                    In 2.2, boolean expressions displayed

                                    0 or 1.  By default, we still accept

                                    them.  This can be disabled by passing

                                    DONT_ACCEPT_TRUE_FOR_1 to the new

                                    optionflags argument.

                                    >>> 4 == 4

                                    1

                                    >>> 4 == 4

                                    True

                                    >>> 4 > 4

                                    0

                                    >>> 4 > 4

                                    False

                                    """,



            "blank lines": r"""

                Blank lines can be marked with <BLANKLINE>:

                    >>> print 'foo\n\nbar\n'

                    foo

                    <BLANKLINE>

                    bar

                    <BLANKLINE>

            """,



            "ellipsis": r"""

                If the ellipsis flag is used, then '...' can be used to

                elide substrings in the desired output:

                    >>> print range(1000) #doctest: +ELLIPSIS

                    [0, 1, 2, ..., 999]

            """,



            "whitespace normalization": r"""

                If the whitespace normalization flag is used, then

                differences in whitespace are ignored.

                    >>> print range(30) #doctest: +NORMALIZE_WHITESPACE

                    [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,

                     15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,

                     27, 28, 29]

            """,

           }



def _test():

    testfiles = [arg for arg in sys.argv[1:] if arg and arg[0] != '-']

    if testfiles:

        for filename in testfiles:

            if filename.endswith(".py"):

                # It is a module -- insert its dir into sys.path and try to

                # import it. If it is part of a package, that possibly won't work

                # because of package imports.

                dirname, filename = os.path.split(filename)

                sys.path.insert(0, dirname)

                m = __import__(filename[:-3])

                del sys.path[0]

                failures, _ = testmod(m)

            else:

                failures, _ = testfile(filename, module_relative=False)

            if failures:

                return 1

    else:

        r = unittest.TextTestRunner()

        r.run(DocTestSuite())

    return 0



if __name__ == "__main__":

    sys.exit(_test())

