cpython/Lib/test/test_pydoc.py

import sys
import os
import os.path
import difflib
import subprocess
import re
import pydoc
import inspect
import unittest
import test.support
from contextlib import contextmanager
from test.support import TESTFN, forget, rmtree, EnvironmentVarGuard

from test import pydoc_mod

expected_text_pattern = \
"""
NAME
    test.pydoc_mod - This is a test module for test_pydoc

FILE
    %s
%s
CLASSES
    builtins.object
        A
        B
\x20\x20\x20\x20
    class A(builtins.object)
     |  Hello and goodbye
     |\x20\x20
     |  Methods defined here:
     |\x20\x20
     |  __init__()
     |      Wow, I have no function!
     |\x20\x20
     |  ----------------------------------------------------------------------
     |  Data descriptors defined here:
     |\x20\x20
     |  __dict__
     |      dictionary for instance variables (if defined)
     |\x20\x20
     |  __weakref__
     |      list of weak references to the object (if defined)
\x20\x20\x20\x20
    class B(builtins.object)
     |  Data descriptors defined here:
     |\x20\x20
     |  __dict__
     |      dictionary for instance variables (if defined)
     |\x20\x20
     |  __weakref__
     |      list of weak references to the object (if defined)
     |\x20\x20
     |  ----------------------------------------------------------------------
     |  Data and other attributes defined here:
     |\x20\x20
     |  NO_MEANING = 'eggs'

FUNCTIONS
    doc_func()
        This function solves all of the world's problems:
        hunger
        lack of Python
        war
\x20\x20\x20\x20
    nodoc_func()

DATA
    __author__ = 'Benjamin Peterson'
    __credits__ = 'Nobody'
    __version__ = '1.2.3.4'

VERSION
    1.2.3.4

AUTHOR
    Benjamin Peterson

CREDITS
    Nobody
""".strip()

expected_html_pattern = \
"""
<table width="100%%" cellspacing=0 cellpadding=2 border=0 summary="heading">
<tr bgcolor="#7799ee">
<td valign=bottom>&nbsp;<br>
<font color="#ffffff" face="helvetica, arial">&nbsp;<br><big><big><strong><a href="test.html"><font color="#ffffff">test</font></a>.pydoc_mod</strong></big></big> (version 1.2.3.4)</font></td
><td align=right valign=bottom
><font color="#ffffff" face="helvetica, arial"><a href=".">index</a><br><a href="file:%s">%s</a>%s</font></td></tr></table>
    <p><tt>This&nbsp;is&nbsp;a&nbsp;test&nbsp;module&nbsp;for&nbsp;test_pydoc</tt></p>
<p>
<table width="100%%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ee77aa">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Classes</strong></big></font></td></tr>
\x20\x20\x20\x20
<tr><td bgcolor="#ee77aa"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
<td width="100%%"><dl>
<dt><font face="helvetica, arial"><a href="builtins.html#object">builtins.object</a>
</font></dt><dd>
<dl>
<dt><font face="helvetica, arial"><a href="test.pydoc_mod.html#A">A</a>
</font></dt><dt><font face="helvetica, arial"><a href="test.pydoc_mod.html#B">B</a>
</font></dt></dl>
</dd>
</dl>
 <p>
<table width="100%%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ffc8d8">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#000000" face="helvetica, arial"><a name="A">class <strong>A</strong></a>(<a href="builtins.html#object">builtins.object</a>)</font></td></tr>
\x20\x20\x20\x20
<tr bgcolor="#ffc8d8"><td rowspan=2><tt>&nbsp;&nbsp;&nbsp;</tt></td>
<td colspan=2><tt>Hello&nbsp;and&nbsp;goodbye<br>&nbsp;</tt></td></tr>
<tr><td>&nbsp;</td>
<td width="100%%">Methods defined here:<br>
<dl><dt><a name="A-__init__"><strong>__init__</strong></a>()</dt><dd><tt>Wow,&nbsp;I&nbsp;have&nbsp;no&nbsp;function!</tt></dd></dl>

<hr>
Data descriptors defined here:<br>
<dl><dt><strong>__dict__</strong></dt>
<dd><tt>dictionary&nbsp;for&nbsp;instance&nbsp;variables&nbsp;(if&nbsp;defined)</tt></dd>
</dl>
<dl><dt><strong>__weakref__</strong></dt>
<dd><tt>list&nbsp;of&nbsp;weak&nbsp;references&nbsp;to&nbsp;the&nbsp;object&nbsp;(if&nbsp;defined)</tt></dd>
</dl>
</td></tr></table> <p>
<table width="100%%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ffc8d8">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#000000" face="helvetica, arial"><a name="B">class <strong>B</strong></a>(<a href="builtins.html#object">builtins.object</a>)</font></td></tr>
\x20\x20\x20\x20
<tr><td bgcolor="#ffc8d8"><tt>&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
<td width="100%%">Data descriptors defined here:<br>
<dl><dt><strong>__dict__</strong></dt>
<dd><tt>dictionary&nbsp;for&nbsp;instance&nbsp;variables&nbsp;(if&nbsp;defined)</tt></dd>
</dl>
<dl><dt><strong>__weakref__</strong></dt>
<dd><tt>list&nbsp;of&nbsp;weak&nbsp;references&nbsp;to&nbsp;the&nbsp;object&nbsp;(if&nbsp;defined)</tt></dd>
</dl>
<hr>
Data and other attributes defined here:<br>
<dl><dt><strong>NO_MEANING</strong> = 'eggs'</dl>

</td></tr></table></td></tr></table><p>
<table width="100%%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#eeaa77">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Functions</strong></big></font></td></tr>
\x20\x20\x20\x20
<tr><td bgcolor="#eeaa77"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
<td width="100%%"><dl><dt><a name="-doc_func"><strong>doc_func</strong></a>()</dt><dd><tt>This&nbsp;function&nbsp;solves&nbsp;all&nbsp;of&nbsp;the&nbsp;world's&nbsp;problems:<br>
hunger<br>
lack&nbsp;of&nbsp;Python<br>
war</tt></dd></dl>
 <dl><dt><a name="-nodoc_func"><strong>nodoc_func</strong></a>()</dt></dl>
</td></tr></table><p>
<table width="100%%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#55aa55">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Data</strong></big></font></td></tr>
\x20\x20\x20\x20
<tr><td bgcolor="#55aa55"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
<td width="100%%"><strong>__author__</strong> = 'Benjamin Peterson'<br>
<strong>__credits__</strong> = 'Nobody'<br>
<strong>__version__</strong> = '1.2.3.4'</td></tr></table><p>
<table width="100%%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#7799ee">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Author</strong></big></font></td></tr>
\x20\x20\x20\x20
<tr><td bgcolor="#7799ee"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
<td width="100%%">Benjamin&nbsp;Peterson</td></tr></table><p>
<table width="100%%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#7799ee">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#ffffff" face="helvetica, arial"><big><strong>Credits</strong></big></font></td></tr>
\x20\x20\x20\x20
<tr><td bgcolor="#7799ee"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td>
<td width="100%%">Nobody</td></tr></table>
""".strip()


# output pattern for missing module
missing_pattern = "no Python documentation found for '%s'"

# output pattern for module with bad imports
badimport_pattern = "problem in %s - ImportError: No module named %s"

def run_pydoc(module_name, *args):
    """
    Runs pydoc on the specified module. Returns the stripped
    output of pydoc.
    """
    cmd = [sys.executable, pydoc.__file__, " ".join(args), module_name]
    output = subprocess.Popen(cmd, stdout=subprocess.PIPE).stdout.read()
    return output.strip()

def get_pydoc_html(module):
    "Returns pydoc generated output as html"
    doc = pydoc.HTMLDoc()
    output = doc.docmodule(module)
    loc = doc.getdocloc(pydoc_mod) or ""
    if loc:
        loc = "<br><a href=\"" + loc + "\">Module Docs</a>"
    return output.strip(), loc

def get_pydoc_text(module):
    "Returns pydoc generated output as text"
    doc = pydoc.TextDoc()
    loc = doc.getdocloc(pydoc_mod) or ""
    if loc:
        loc = "\nMODULE DOCS\n    " + loc + "\n"

    output = doc.docmodule(module)

    # cleanup the extra text formatting that pydoc preforms
    patt = re.compile('\b.')
    output = patt.sub('', output)
    return output.strip(), loc

def print_diffs(text1, text2):
    "Prints unified diffs for two texts"
    lines1 = text1.splitlines(True)
    lines2 = text2.splitlines(True)
    diffs = difflib.unified_diff(lines1, lines2, n=0, fromfile='expected',
                                 tofile='got')
    print('\n' + ''.join(diffs))


class PyDocDocTest(unittest.TestCase):

    def test_html_doc(self):
        result, doc_loc = get_pydoc_html(pydoc_mod)
        mod_file = inspect.getabsfile(pydoc_mod)
        if sys.platform == 'win32':
            import nturl2path
            mod_url = nturl2path.pathname2url(mod_file)
        else:
            mod_url = mod_file
        expected_html = expected_html_pattern % (mod_url, mod_file, doc_loc)
        if result != expected_html:
            print_diffs(expected_html, result)
            self.fail("outputs are not equal, see diff above")

    def test_text_doc(self):
        result, doc_loc = get_pydoc_text(pydoc_mod)
        expected_text = expected_text_pattern % \
                        (inspect.getabsfile(pydoc_mod), doc_loc)
        if result != expected_text:
            print_diffs(expected_text, result)
            self.fail("outputs are not equal, see diff above")

    def test_not_here(self):
        missing_module = "test.i_am_not_here"
        result = str(run_pydoc(missing_module), 'ascii')
        expected = missing_pattern % missing_module
        self.assertEqual(expected, result,
            "documentation for missing module found")

    def test_badimport(self):
        # This tests the fix for issue 5230, where if pydoc found the module
        # but the module had an internal import error pydoc would report no doc
        # found.
        modname = 'testmod_xyzzy'
        testpairs = (
            ('i_am_not_here', 'i_am_not_here'),
            ('test.i_am_not_here_either', 'i_am_not_here_either'),
            ('test.i_am_not_here.neither_am_i', 'i_am_not_here.neither_am_i'),
            ('i_am_not_here.{}'.format(modname), 'i_am_not_here.{}'.format(modname)),
            ('test.{}'.format(modname), modname),
            )

        @contextmanager
        def newdirinpath(dir):
            os.mkdir(dir)
            sys.path.insert(0, dir)
            yield
            sys.path.pop(0)
            rmtree(dir)

        with newdirinpath(TESTFN), EnvironmentVarGuard() as env:
            env['PYTHONPATH'] = TESTFN
            fullmodname = os.path.join(TESTFN, modname)
            sourcefn = fullmodname + os.extsep + "py"
            for importstring, expectedinmsg in testpairs:
                f = open(sourcefn, 'w')
                f.write("import {}\n".format(importstring))
                f.close()
                try:
                    result = run_pydoc(modname).decode("ascii")
                finally:
                    forget(modname)
                expected = badimport_pattern % (modname, expectedinmsg)
                self.assertEqual(expected, result)

    def test_input_strip(self):
        missing_module = " test.i_am_not_here "
        result = str(run_pydoc(missing_module), 'ascii')
        expected = missing_pattern % missing_module.strip()
        self.assertEqual(expected, result)


class TestDescriptions(unittest.TestCase):

    def test_module(self):
        # Check that pydocfodder module can be described
        from test import pydocfodder
        doc = pydoc.render_doc(pydocfodder)
        self.assertTrue("pydocfodder" in doc)

    def test_classic_class(self):
        class C: "Classic class"
        c = C()
        self.assertEqual(pydoc.describe(C), 'class C')
        self.assertEqual(pydoc.describe(c), 'C')
        expected = 'C in module %s' % __name__
        self.assertTrue(expected in pydoc.render_doc(c))

    def test_class(self):
        class C(object): "New-style class"
        c = C()

        self.assertEqual(pydoc.describe(C), 'class C')
        self.assertEqual(pydoc.describe(c), 'C')
        expected = 'C in module %s object' % __name__
        self.assertTrue(expected in pydoc.render_doc(c))


def test_main():
    test.support.run_unittest(PyDocDocTest, TestDescriptions)

if __name__ == "__main__":
    test_main()