# -*- coding: latin-1 -*-
"""Generate Python documentation in HTML or text for interactive use.
In the Python interpreter, do "from pydoc import help" to provide online
help. Calling help(thing) on a Python object documents the object.
Or, at the shell command line outside of Python:
Run "pydoc <name>" to show documentation on something. <name> may be
the name of a function, module, package, or a dotted reference to a
class or function within a module or module in a package. If the
argument contains a path segment delimiter (e.g. slash on Unix,
backslash on Windows) it is treated as the path to a Python source file.
Run "pydoc -k <keyword>" to search for a keyword in the synopsis lines
of all available modules.
Run "pydoc -p <port>" to start an HTTP server on a given port on the
local machine to generate documentation web pages. Port number 0 can be
used to get an arbitrary unused port.
Run "pydoc -w <name>" to write out the HTML documentation for a module
to a file named "<name>.html".
Module docs for core modules are assumed to be in
https://docs.python.org/library/
This can be overridden by setting the PYTHONDOCS environment variable
to a different URL or to a local directory containing the Library
__author__ = "Ka-Ping Yee <ping@lfw.org>"
__date__ = "26 February 2001"
__version__ = "$Revision: 88564 $"
__credits__ = """Guido van Rossum, for an excellent programming language.
Tommy Burnette, the original creator of manpy.
Paul Prescod, for all his work on onlinehelp.
Richard Chamberlain, for the first implementation of textdoc.
# Known bugs that can't be fixed here:
# - imp.load_module() cannot be prevented from clobbering existing
# loaded modules, so calling synopsis() on a binary module file
# changes the contents of any existing module with the same name.
# - If the __file__ attribute on a module is a relative path and
# the current directory is changed with os.chdir(), an incorrect
# path will be displayed.
import sys, imp, os, re, types, inspect, __builtin__, pkgutil, warnings
from string import expandtabs, find, join, lower, split, strip, rfind, rstrip
from traceback import extract_tb
from collections import deque
# Python 2.3 compatibility
# --------------------------------------------------------- common routines
"""Convert sys.path into a list of absolute, existing, unique paths."""
dir = os.path.abspath(dir or '.')
normdir = os.path.normcase(dir)
if normdir not in normdirs and os.path.isdir(dir):
"""Get the doc string or comments for an object."""
result = inspect.getdoc(object) or inspect.getcomments(object)
return result and re.sub('^ *\n', '', rstrip(result)) or ''
"""Split a doc string into a synopsis line (if any) and the rest."""
lines = split(strip(doc), '\n')
elif len(lines) >= 2 and not rstrip(lines[1]):
return lines[0], join(lines[2:], '\n')
return '', join(lines, '\n')
def classname(object, modname):
"""Get a class name and qualify it with a module name if necessary."""
if object.__module__ != modname:
name = object.__module__ + '.' + name
"""Check if an object is of a type that probably means it's data."""
return not (inspect.ismodule(object) or inspect.isclass(object) or
inspect.isroutine(object) or inspect.isframe(object) or
inspect.istraceback(object) or inspect.iscode(object))
def replace(text, *pairs):
"""Do a series of global replacements on a string."""
text = join(split(text, pairs[0]), pairs[1])
"""Omit part of a string if needed to make it fit in a maximum length."""
pre = max(0, (maxlen-3)//2)
post = max(0, maxlen-3-pre)
return text[:pre] + '...' + text[len(text)-post:]
_re_stripid = re.compile(r' at 0x[0-9a-f]{6,16}(>+)$', re.IGNORECASE)
"""Remove the hexadecimal id from a Python object representation."""
# The behaviour of %p is implementation-dependent in terms of case.
return _re_stripid.sub(r'\1', text)
def _is_some_method(obj):
return inspect.ismethod(obj) or inspect.ismethoddescriptor(obj)
for key, value in inspect.getmembers(cl, _is_some_method):
for base in cl.__bases__:
methods.update(allmethods(base)) # all your base are belong to us
for key in methods.keys():
methods[key] = getattr(cl, key)
def _split_list(s, predicate):
"""Split sequence s via predicate, and return pair ([true], [false]).
The return value is a 2-tuple of lists,
([x for x in s if predicate(x)],
[x for x in s if not predicate(x)])
def visiblename(name, all=None, obj=None):
"""Decide whether to show documentation on a variable."""
# Certain special names are redundant.
_hidden_names = ('__builtins__', '__doc__', '__file__', '__path__',
'__module__', '__name__', '__slots__', '__package__')
if name in _hidden_names: return 0
# Private names are hidden, but special names are displayed.
if name.startswith('__') and name.endswith('__'): return 1
# Namedtuples have public fields and methods with a single leading underscore
if name.startswith('_') and hasattr(obj, '_fields'):
# only document that which the programmer exported in __all__
return not name.startswith('_')
def classify_class_attrs(object):
"""Wrap inspect.classify_class_attrs, with fixup for data descriptors."""
name, kind, cls, value = data
if inspect.isdatadescriptor(value):
return name, kind, cls, value
return map(fixup, inspect.classify_class_attrs(object))
# ----------------------------------------------------- Unicode support helpers
# If Python is built without Unicode support, the unicode type
# will not exist. Fake one that nothing will match, and make
# the _encode function that do nothing.
def _encode(text, encoding='ascii'):
_encoding = locale.getpreferredencoding()
def _encode(text, encoding=None):
if isinstance(text, unicode):
return text.encode(encoding or _encoding, 'xmlcharrefreplace')
# Ensure that we have an encoded (binary) string representation of obj,
# even if it is a unicode string.
if isinstance(obj, _unicode):
return obj.encode(_encoding, 'xmlcharrefreplace')
# ----------------------------------------------------- module manipulation
"""Guess whether a path refers to a package directory."""
for ext in ('.py', '.pyc', '.pyo'):
if os.path.isfile(os.path.join(path, '__init__' + ext)):
def source_synopsis(file):
while line[:1] == '#' or not strip(line):
if line[:4] == 'r"""': line = line[1:]
if line[-1:] == '\\': line = line[:-1]
result = strip(split(line, '"""')[0])
def synopsis(filename, cache={}):
"""Get the one-line summary out of a module file."""
mtime = os.stat(filename).st_mtime
lastupdate, result = cache.get(filename, (None, None))
if lastupdate is None or lastupdate < mtime:
info = inspect.getmoduleinfo(filename)
# module can't be opened, so skip it
if info and 'b' in info[2]: # binary modules have to be imported
try: module = imp.load_module('__temp__', file, filename, info[1:])
result = module.__doc__.splitlines()[0] if module.__doc__ else None
del sys.modules['__temp__']
else: # text modules can be directly examined
result = source_synopsis(file)
cache[filename] = (mtime, result)
class ErrorDuringImport(Exception):
"""Errors that occurred while trying to import something to document it."""
def __init__(self, filename, exc_info):
exc, value, tb = exc_info
if type(exc) is types.ClassType:
return 'problem in %s - %s: %s' % (self.filename, exc, self.value)
"""Import a Python source file or compiled file given its path."""
if file.read(len(magic)) == magic:
filename = os.path.basename(path)
name, ext = os.path.splitext(filename)
module = imp.load_module(name, file, path, (ext, 'r', kind))
raise ErrorDuringImport(path, sys.exc_info())
def safeimport(path, forceload=0, cache={}):
"""Import a module; handle errors; return None if the module isn't found.
If the module *is* found but an exception occurs, it's wrapped in an
ErrorDuringImport exception and reraised. Unlike __import__, if a
package path is specified, the module at the end of the path is returned,
not the package at the beginning. If the optional 'forceload' argument
is 1, we reload the module from disk (unless it's a dynamic extension)."""
# If forceload is 1 and the module has been previously loaded from
# disk, we always have to reload the module. Checking the file's
# mtime isn't good enough (e.g. the module could contain a class
# that inherits from another module that has changed).
if forceload and path in sys.modules:
if path not in sys.builtin_module_names:
# Avoid simply calling reload() because it leaves names in
# the currently loaded module lying around if they're not
# defined in the new source file. Instead, remove the
# module from sys.modules and re-import. Also remove any
# submodules because they won't appear in the newly loaded
# module's namespace if they're already in sys.modules.
subs = [m for m in sys.modules if m.startswith(path + '.')]
for key in [path] + subs:
# Prevent garbage collection.
cache[key] = sys.modules[key]
module = __import__(path)
# Did the error occur before or after the module was found?
(exc, value, tb) = info = sys.exc_info()
# An error occurred while executing the imported module.
raise ErrorDuringImport(sys.modules[path].__file__, info)
# A SyntaxError occurred before we could execute the module.
raise ErrorDuringImport(value.filename, info)
elif exc is ImportError and extract_tb(tb)[-1][2]=='safeimport':
# The import error occurred directly in this function,
# which means there is no such module in the path.
# Some other error occurred during the importing process.
raise ErrorDuringImport(path, sys.exc_info())
for part in split(path, '.')[1:]:
try: module = getattr(module, part)
except AttributeError: return None
# ---------------------------------------------------- formatter base class
def document(self, object, name=None, *args):
"""Generate documentation for an object."""
args = (object, name) + args
# 'try' clause is to attempt to handle the possibility that inspect
# identifies something in a way that pydoc itself has issues handling;
# think 'super' and how it is a descriptor (which raises the exception
# by lacking a __name__ attribute) and an instance.
if inspect.isgetsetdescriptor(object): return self.docdata(*args)
if inspect.ismemberdescriptor(object): return self.docdata(*args)
if inspect.ismodule(object): return self.docmodule(*args)
if inspect.isclass(object): return self.docclass(*args)
if inspect.isroutine(object): return self.docroutine(*args)
if isinstance(object, property): return self.docproperty(*args)
return self.docother(*args)
def fail(self, object, name=None, *args):
"""Raise an exception for unimplemented types."""
message = "don't know how to document object%s of type %s" % (
name and ' ' + repr(name), type(object).__name__)
docmodule = docclass = docroutine = docother = docproperty = docdata = fail
def getdocloc(self, object,
basedir=os.path.join(sys.exec_prefix, "lib",
"python"+sys.version[0:3])):
"""Return the location of module docs or None"""
file = inspect.getabsfile(object)
docloc = os.environ.get("PYTHONDOCS",
"https://docs.python.org/library")
basedir = os.path.normcase(basedir)
if (isinstance(object, type(os)) and
(object.__name__ in ('errno', 'exceptions', 'gc', 'imp',
'marshal', 'posix', 'signal', 'sys',
'thread', 'zipimport') or
(file.startswith(basedir) and
not file.startswith(os.path.join(basedir, 'site-packages')))) and
object.__name__ not in ('xml.etree', 'test.pydoc_mod')):
if docloc.startswith(("http://", "https://")):
docloc = "%s/%s" % (docloc.rstrip("/"), object.__name__.lower())
docloc = os.path.join(docloc, object.__name__.lower() + ".html")
# -------------------------------------------- HTML documentation generator
"""Class for safely making an HTML representation of a Python object."""
self.maxlist = self.maxtuple = 20
self.maxstring = self.maxother = 100
return replace(text, '&', '&', '<', '<', '>', '>')
return Repr.repr(self, object)
def repr1(self, x, level):
if hasattr(type(x), '__name__'):
methodname = 'repr_' + join(split(type(x).__name__), '_')
if hasattr(self, methodname):
return getattr(self, methodname)(x, level)
return self.escape(cram(stripid(repr(x)), self.maxother))
def repr_string(self, x, level):
test = cram(x, self.maxstring)
if '\\' in test and '\\' not in replace(testrepr, r'\\', ''):
# Backslashes are only literal in the string and are never
# needed to make any special characters, so show a raw string.
return 'r' + testrepr[0] + self.escape(test) + testrepr[0]
return re.sub(r'((\\[\\abfnrtv\'"]|\\[0-9]..|\\x..|\\u....)+)',
r'<font color="#c040c0">\1</font>',
def repr_instance(self, x, level):
return self.escape(cram(stripid(repr(x)), self.maxstring))
return self.escape('<%s instance>' % x.__class__.__name__)
repr_unicode = repr_string
"""Formatter class for HTML documentation."""
# ------------------------------------------- HTML formatting utilities
_repr_instance = HTMLRepr()
repr = _repr_instance.repr
escape = _repr_instance.escape
def page(self, title, contents):
"""Format an HTML page."""
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head><title>Python: %s</title>
</head><body bgcolor="#f0f0f8">
</body></html>''' % (title, contents), 'ascii')
def heading(self, title, fgcol, bgcol, extras=''):
"""Format a page heading."""
<table width="100%%" cellspacing=0 cellpadding=2 border=0 summary="heading">
<td valign=bottom> <br>
<font color="%s" face="helvetica, arial"> <br>%s</font></td
><td align=right valign=bottom
><font color="%s" face="helvetica, arial">%s</font></td></tr></table>
''' % (bgcol, fgcol, title, fgcol, extras or ' ')
def section(self, title, fgcol, bgcol, contents, width=6,
prelude='', marginalia=None, gap=' '):
"""Format a section with a heading."""
marginalia = '<tt>' + ' ' * width + '</tt>'
<table width="100%%" cellspacing=0 cellpadding=2 border=0 summary="section">
<td colspan=3 valign=bottom> <br>
<font color="%s" face="helvetica, arial">%s</font></td></tr>
''' % (bgcol, fgcol, title)
<tr bgcolor="%s"><td rowspan=2>%s</td>
<td colspan=2>%s</td></tr>
<tr><td>%s</td>''' % (bgcol, marginalia, prelude, gap)
<tr><td bgcolor="%s">%s</td><td>%s</td>''' % (bgcol, marginalia, gap)
return result + '\n<td width="100%%">%s</td></tr></table>' % contents
def bigsection(self, title, *args):
"""Format a section with a big heading."""
title = '<big><strong>%s</strong></big>' % title
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