sphinx/sphinx/ext/autodoc.py

694 lines
27 KiB
Python

# -*- coding: utf-8 -*-
"""
sphinx.ext.autodoc
~~~~~~~~~~~~~~~~~~
Automatically insert docstrings for functions, classes or whole modules into
the doctree, thus avoiding duplication between docstrings and documentation
for those who like elaborate docstrings.
:copyright: 2008 by Georg Brandl, Pauli Virtanen, Martin Hans.
:license: BSD.
"""
import re
import sys
import inspect
import linecache
from types import FunctionType, BuiltinFunctionType, MethodType, ClassType
from docutils import nodes
from docutils.parsers.rst import directives
from docutils.statemachine import ViewList
from sphinx.util import rpartition, nested_parse_with_titles
clstypes = (type, ClassType)
try:
base_exception = BaseException
except NameError:
base_exception = Exception
_charset_re = re.compile(r'coding[:=]\s*([-\w.]+)')
_module_charsets = {}
py_ext_sig_re = re.compile(
r'''^ ([\w.]+::)? # explicit module name
([\w.]+\.)? # module and/or class name(s)
(\w+) \s* # thing name
(?: \((.*)\) # optional arguments
(\s* -> \s* .*)? )? $ # optional return annotation
''', re.VERBOSE)
class Options(object):
pass
def is_static_method(obj):
"""Check if the object given is a static method."""
if isinstance(obj, (FunctionType, classmethod)):
return True
elif isinstance(obj, BuiltinFunctionType):
return obj.__self__ is not None
elif isinstance(obj, MethodType):
return obj.im_self is not None
return False
class AutodocReporter(object):
"""
A reporter replacement that assigns the correct source name
and line number to a system message, as recorded in a ViewList.
"""
def __init__(self, viewlist, reporter):
self.viewlist = viewlist
self.reporter = reporter
def __getattr__(self, name):
return getattr(self.reporter, name)
def system_message(self, level, message, *children, **kwargs):
if 'line' in kwargs:
try:
source, line = self.viewlist.items[kwargs['line']]
except IndexError:
pass
else:
kwargs['source'] = source
kwargs['line'] = line
return self.reporter.system_message(level, message,
*children, **kwargs)
def debug(self, *args, **kwargs):
if self.reporter.debug_flag:
return self.system_message(0, *args, **kwargs)
def info(self, *args, **kwargs):
return self.system_message(1, *args, **kwargs)
def warning(self, *args, **kwargs):
return self.system_message(2, *args, **kwargs)
def error(self, *args, **kwargs):
return self.system_message(3, *args, **kwargs)
def severe(self, *args, **kwargs):
return self.system_message(4, *args, **kwargs)
# Some useful event listener factories for autodoc-process-docstring.
def cut_lines(pre, post=0, what=None):
"""
Return a listener that removes the first *pre* and last *post*
lines of every docstring. If *what* is a sequence of strings,
only docstrings of a type in *what* will be processed.
Use like this (e.g. in the ``setup()`` function of :file:`conf.py`)::
from sphinx.ext.autodoc import cut_lines
app.connect('autodoc-process-docstring', cut_lines(4, what=['module']))
This can (and should) be used in place of :confval:`automodule_skip_lines`.
"""
def process(app, what_, name, obj, options, lines):
if what and what_ not in what:
return
del lines[:pre]
if post:
# remove one trailing blank line.
if lines and not lines[-1]:
lines.pop(-1)
del lines[-post:]
# make sure there is a blank line at the end
if lines and lines[-1]:
lines.append('')
return process
def between(marker, what=None, keepempty=False):
"""
Return a listener that only keeps lines between lines that match the
*marker* regular expression. If no line matches, the resulting docstring
would be empty, so no change will be made unless *keepempty* is true.
If *what* is a sequence of strings, only docstrings of a type in *what* will
be processed.
"""
marker_re = re.compile(marker)
def process(app, what_, name, obj, options, lines):
if what and what_ not in what:
return
deleted = 0
delete = True
orig_lines = lines[:]
for i, line in enumerate(orig_lines):
if delete:
lines.pop(i - deleted)
deleted += 1
if marker_re.match(line):
delete = not delete
if delete:
lines.pop(i - deleted)
deleted += 1
if not lines and not keepempty:
lines[:] = orig_lines
# make sure there is a blank line at the end
if lines and lines[-1]:
lines.append('')
return process
def isdescriptor(x):
"""Check if the object is some kind of descriptor."""
for item in '__get__', '__set__', '__delete__':
if callable(getattr(x, item, None)):
return True
return False
def prepare_docstring(s):
"""
Convert a docstring into lines of parseable reST. Return it as a list of
lines usable for inserting into a docutils ViewList (used as argument
of nested_parse().) An empty line is added to act as a separator between
this docstring and following content.
"""
lines = s.expandtabs().splitlines()
# Find minimum indentation of any non-blank lines after first line.
margin = sys.maxint
for line in lines[1:]:
content = len(line.lstrip())
if content:
indent = len(line) - content
margin = min(margin, indent)
# Remove indentation.
if lines:
lines[0] = lines[0].lstrip()
if margin < sys.maxint:
for i in range(1, len(lines)): lines[i] = lines[i][margin:]
# Remove any leading blank lines.
while lines and not lines[0]:
lines.pop(0)
# make sure there is an empty line at the end
if lines and lines[-1]:
lines.append('')
return lines
def get_module_charset(module):
"""Return the charset of the given module (cached in _module_charsets)."""
if module in _module_charsets:
return _module_charsets[module]
try:
filename = __import__(module, None, None, ['foo']).__file__
except (ImportError, AttributeError):
return None
if filename[-4:].lower() in ('.pyc', '.pyo'):
filename = filename[:-1]
for line in [linecache.getline(filename, x) for x in (1, 2)]:
match = _charset_re.search(line)
if match is not None:
charset = match.group(1)
break
else:
charset = 'ascii'
_module_charsets[module] = charset
return charset
class RstGenerator(object):
def __init__(self, options, document, lineno):
self.options = options
self.env = document.settings.env
self.reporter = document.reporter
self.lineno = lineno
self.filename_set = set()
self.warnings = []
self.result = ViewList()
def warn(self, msg):
self.warnings.append(self.reporter.warning(msg, line=self.lineno))
def get_doc(self, what, name, obj):
"""Format and yield lines of the docstring(s) for the object."""
docstrings = []
if getattr(obj, '__doc__', None):
docstrings.append(obj.__doc__)
# skip some lines in module docstrings if configured
if what == 'module' and self.env.config.automodule_skip_lines and docstrings:
docstrings[0] = '\n'.join(docstrings[0].splitlines()
[self.env.config.automodule_skip_lines:])
# for classes, what the "docstring" is can be controlled via an option
if what in ('class', 'exception'):
content = self.env.config.autoclass_content
if content in ('both', 'init'):
initdocstring = getattr(obj, '__init__', None).__doc__
# for new-style classes, no __init__ means default __init__
if initdocstring == object.__init__.__doc__:
initdocstring = None
if initdocstring:
if content == 'init':
docstrings = [initdocstring]
else:
docstrings.append(initdocstring)
# the default is only the class docstring
# decode the docstrings using the module's source encoding
charset = None
module = getattr(obj, '__module__', None)
if module is not None:
charset = get_module_charset(module)
for docstring in docstrings:
if isinstance(docstring, str):
if charset:
docstring = docstring.decode(charset)
else:
try:
# try decoding with utf-8, should only work for real UTF-8
docstring = docstring.decode('utf-8')
except UnicodeError:
# last resort -- can't fail
docstring = docstring.decode('latin1')
docstringlines = prepare_docstring(docstring)
if self.env.app:
# let extensions preprocess docstrings
self.env.app.emit('autodoc-process-docstring',
what, name, obj, self.options, docstringlines)
for line in docstringlines:
yield line
def resolve_name(self, what, name):
"""
Determine what module to import and what attribute to document.
Returns a tuple of: the full name, the module name, a path of
names to get via getattr, the signature and return annotation.
"""
# first, parse the definition -- auto directives for classes and functions
# can contain a signature which is then used instead of an autogenerated one
try:
mod, path, base, args, retann = py_ext_sig_re.match(name).groups()
except:
self.warn('invalid signature for auto%s (%r)' % (what, name))
return None, [], None, None
# support explicit module and class name separation via ::
if mod is not None:
mod = mod[:-2]
parents = path and path.rstrip('.').split('.') or []
else:
parents = []
if what == 'module':
if mod is not None:
self.warn('"::" in automodule name doesn\'t make sense')
if args or retann:
self.warn('ignoring signature arguments and return annotation '
'for automodule %s' % name)
return (path or '') + base, [], None, None
elif what in ('exception', 'function', 'class'):
if mod is None:
if path:
mod = path.rstrip('.')
else:
# if documenting a toplevel object without explicit module, it can
# be contained in another auto directive ...
if hasattr(self.env, 'autodoc_current_module'):
mod = self.env.autodoc_current_module
# ... or in the scope of a module directive
if not mod:
mod = self.env.currmodule
return mod, parents + [base], args, retann
else:
if mod is None:
if path:
mod_cls = path.rstrip('.')
else:
mod_cls = None
# if documenting a class-level object without path, there must be a
# current class, either from a parent auto directive ...
if hasattr(self.env, 'autodoc_current_class'):
mod_cls = self.env.autodoc_current_class
# ... or from a class directive
if mod_cls is None:
mod_cls = self.env.currclass
# ... if still None, there's no way to know
if mod_cls is None:
return None, [], None, None
mod, cls = rpartition(mod_cls, '.')
parents = [cls]
# if the module name is still missing, get it like above
if not mod and hasattr(self.env, 'autodoc_current_module'):
mod = self.env.autodoc_current_module
if not mod:
mod = self.env.currmodule
return mod, parents + [base], args, retann
def format_signature(self, what, name, obj, args, retann):
"""
Return the signature of the object, formatted for display.
"""
if what not in ('class', 'method', 'function'):
return ''
err = None
if args is not None:
# signature given explicitly
args = "(%s)" % args
else:
# try to introspect the signature
try:
args = None
getargs = True
if what == 'class':
# for classes, the relevant signature is the __init__ method's
obj = getattr(obj, '__init__', None)
# classes without __init__ method, default __init__ or
# __init__ written in C?
if obj is None or obj is object.__init__ or not \
(inspect.ismethod(obj) or inspect.isfunction(obj)):
getargs = False
elif inspect.isbuiltin(obj) or inspect.ismethoddescriptor(obj):
# can never get arguments of a C function or method
getargs = False
if getargs:
argspec = inspect.getargspec(obj)
if what in ('class', 'method') and argspec[0] and \
argspec[0][0] in ('cls', 'self'):
del argspec[0][0]
args = inspect.formatargspec(*argspec)
except Exception, e:
args = None
err = e
result = self.env.app.emit_firstresult('autodoc-process-signature', what,
name, obj, self.options, args, retann)
if result:
args, retann = result
if args is not None:
return '%s%s' % (args, retann or '')
elif err:
# re-raise the error for perusal of the handler in generate()
raise RuntimeError(err)
else:
return ''
def generate(self, what, name, members, add_content, indent=u'', check_module=False,
no_docstring=False):
"""
Generate reST for the object in self.result.
"""
mod, objpath, args, retann = self.resolve_name(what, name)
if not mod:
# need a module to import
self.warn('don\'t know which module to import for autodocumenting %r '
'(try placing a "module" or "currentmodule" directive in the '
'document, or giving an explicit module name)' % name)
return
# fully-qualified name
fullname = mod + (objpath and '.' + '.'.join(objpath) or '')
# the name to put into the generated directive -- doesn't contain the module
name_in_directive = '.'.join(objpath) or mod
# now, import the module and get object to document
try:
todoc = module = __import__(mod, None, None, ['foo'])
if hasattr(module, '__file__') and module.__file__:
modfile = module.__file__
if modfile[-4:].lower() in ('.pyc', '.pyo'):
modfile = modfile[:-1]
self.filename_set.add(modfile)
else:
modfile = None # e.g. for builtin and C modules
for part in objpath:
todoc = getattr(todoc, part)
except (ImportError, AttributeError), err:
self.warn('autodoc can\'t import/find %s %r, it reported error: "%s", '
'please check your spelling and sys.path' %
(what, str(fullname), err))
return
# check __module__ of object if wanted (for members not given explicitly)
if check_module:
if hasattr(todoc, '__module__'):
if todoc.__module__ != mod:
return
# format the object's signature, if any
try:
sig = self.format_signature(what, fullname, todoc, args, retann)
except Exception, err:
self.warn('error while formatting signature for %s: %s' %
(fullname, err))
sig = ''
# make sure that the result starts with an empty line. This is
# necessary for some situations where another directive preprocesses
# reST and no starting newline is present
self.result.append(u'', '')
# now, create the directive header
directive = (what == 'method' and is_static_method(todoc)) \
and 'staticmethod' or what
self.result.append(indent + u'.. %s:: %s%s' %
(directive, name_in_directive, sig), '<autodoc>')
if what == 'module':
# Add some module-specific options
if self.options.synopsis:
self.result.append(indent + u' :synopsis: ' + self.options.synopsis,
'<autodoc>')
if self.options.platform:
self.result.append(indent + u' :platform: ' + self.options.platform,
'<autodoc>')
if self.options.deprecated:
self.result.append(indent + u' :deprecated:', '<autodoc>')
else:
# Be explicit about the module, this is necessary since .. class:: doesn't
# support a prepended module name
self.result.append(indent + u' :module: %s' % mod, '<autodoc>')
if self.options.noindex:
self.result.append(indent + u' :noindex:', '<autodoc>')
self.result.append(u'', '<autodoc>')
if self.options.show_inheritance and what in ('class', 'exception'):
if len(todoc.__bases__):
bases = [b.__module__ == '__builtin__' and
u':class:`%s`' % b.__name__ or
u':class:`%s.%s`' % (b.__module__, b.__name__)
for b in todoc.__bases__]
self.result.append(indent + u' Bases: %s' % ', '.join(bases),
'<autodoc>')
self.result.append(u'', '<autodoc>')
# the module directive doesn't have content
if what != 'module':
indent += u' '
if modfile:
sourcename = '%s:docstring of %s' % (modfile, fullname)
else:
sourcename = 'docstring of %s' % fullname
# add content from docstrings
if not no_docstring:
for i, line in enumerate(self.get_doc(what, fullname, todoc)):
self.result.append(indent + line, sourcename, i)
# add source content, if present
if add_content:
for line, src in zip(add_content.data, add_content.items):
self.result.append(indent + line, src[0], src[1])
# document members?
if not members or what in ('function', 'method', 'data', 'attribute'):
return
# set current namespace for finding members
self.env.autodoc_current_module = mod
if objpath:
self.env.autodoc_current_class = objpath[0]
# add members, if possible
_all = members == ['__all__']
members_check_module = False
if _all:
# unqualified :members: given
if what == 'module':
if hasattr(todoc, '__all__'):
members_check_module = False
all_members = []
for mname in todoc.__all__:
try:
all_members.append((mname, getattr(todoc, mname)))
except AttributeError:
self.warn('missing attribute mentioned in __all__: '
'module %s, attribute %s' %
(todoc.__name__, mname))
else:
# for implicit module members, check __module__ to avoid
# documenting imported objects
members_check_module = True
all_members = inspect.getmembers(todoc)
else:
if self.options.inherited_members:
# getmembers() uses dir() which pulls in members from all
# base classes
all_members = inspect.getmembers(todoc)
else:
# __dict__ contains only the members directly defined in the class
all_members = sorted(todoc.__dict__.iteritems())
else:
all_members = [(mname, getattr(todoc, mname)) for mname in members]
for (membername, member) in all_members:
if _all and membername.startswith('_'):
# ignore members whose name starts with _ by default
skip = True
else:
# ignore undocumented members if :undoc-members: is not given
doc = getattr(member, '__doc__', None)
skip = not self.options.undoc_members and not doc
# give the user a chance to decide whether this member should be skipped
if self.env.app:
# let extensions preprocess docstrings
skip_user = self.env.app.emit_firstresult(
'autodoc-skip-member', what, membername, member, skip, self.options)
if skip_user is not None:
skip = skip_user
if skip:
continue
content = None
if what == 'module':
if isinstance(member, (FunctionType, BuiltinFunctionType)):
memberwhat = 'function'
elif isinstance(member, clstypes):
if member.__name__ != membername:
# assume it's aliased
memberwhat = 'data'
content = ViewList([_('alias of :class:`%s`') % member.__name__],
source='')
elif issubclass(member, base_exception):
memberwhat = 'exception'
else:
memberwhat = 'class'
else:
# XXX: todo -- attribute docs
continue
else:
if isinstance(member, clstypes):
if member.__name__ != membername:
# assume it's aliased
memberwhat = 'attribute'
content = ViewList([_('alias of :class:`%s`') % member.__name__],
source='')
else:
memberwhat = 'class'
elif callable(member):
memberwhat = 'method'
elif isdescriptor(member):
memberwhat = 'attribute'
else:
# XXX: todo -- attribute docs
continue
# give explicitly separated module name, so that members of inner classes
# can be documented
full_membername = mod + '::' + '.'.join(objpath + [membername])
self.generate(memberwhat, full_membername, ['__all__'],
add_content=content, no_docstring=bool(content),
indent=indent, check_module=members_check_module)
self.env.autodoc_current_module = None
self.env.autodoc_current_class = None
def _auto_directive(dirname, arguments, options, content, lineno,
content_offset, block_text, state, state_machine):
what = dirname[4:] # strip "auto"
name = arguments[0]
genopt = Options()
members = options.get('members', [])
genopt.inherited_members = 'inherited-members' in options
if genopt.inherited_members and not members:
# :inherited-members: implies :members:
members = ['__all__']
genopt.undoc_members = 'undoc-members' in options
genopt.show_inheritance = 'show-inheritance' in options
genopt.noindex = 'noindex' in options
genopt.synopsis = options.get('synopsis', '')
genopt.platform = options.get('platform', '')
genopt.deprecated = 'deprecated' in options
generator = RstGenerator(genopt, state.document, lineno)
generator.generate(what, name, members, content)
if not generator.result:
return generator.warnings
# record all filenames as dependencies -- this will at least partially make
# automatic invalidation possible
for fn in generator.filename_set:
state.document.settings.env.note_dependency(fn)
# use a custom reporter that correctly assigns lines to source and lineno
old_reporter = state.memo.reporter
state.memo.reporter = AutodocReporter(generator.result, state.memo.reporter)
if dirname == 'automodule':
node = nodes.section()
nested_parse_with_titles(state, generator.result, node)
else:
node = nodes.paragraph()
state.nested_parse(generator.result, 0, node)
state.memo.reporter = old_reporter
return generator.warnings + node.children
def auto_directive(*args, **kwds):
return _auto_directive(*args, **kwds)
def automodule_directive(*args, **kwds):
return _auto_directive(*args, **kwds)
def autoclass_directive(*args, **kwds):
return _auto_directive(*args, **kwds)
def members_option(arg):
if arg is None:
return ['__all__']
return [x.strip() for x in arg.split(',')]
def setup(app):
mod_options = {'members': members_option, 'undoc-members': directives.flag,
'noindex': directives.flag, 'inherited-members': directives.flag,
'show-inheritance': directives.flag, 'synopsis': lambda x: x,
'platform': lambda x: x, 'deprecated': directives.flag}
cls_options = {'members': members_option, 'undoc-members': directives.flag,
'noindex': directives.flag, 'inherited-members': directives.flag,
'show-inheritance': directives.flag}
app.add_directive('automodule', automodule_directive,
1, (1, 0, 1), **mod_options)
app.add_directive('autoclass', autoclass_directive,
1, (1, 0, 1), **cls_options)
app.add_directive('autoexception', autoclass_directive,
1, (1, 0, 1), **cls_options)
app.add_directive('autodata', auto_directive, 1, (1, 0, 1),
noindex=directives.flag)
app.add_directive('autofunction', auto_directive, 1, (1, 0, 1),
noindex=directives.flag)
app.add_directive('automethod', auto_directive, 1, (1, 0, 1),
noindex=directives.flag)
app.add_directive('autoattribute', auto_directive, 1, (1, 0, 1),
noindex=directives.flag)
# deprecated: remove in some future version.
app.add_config_value('automodule_skip_lines', 0, True)
app.add_config_value('autoclass_content', 'class', True)
app.add_event('autodoc-process-docstring')
app.add_event('autodoc-process-signature')
app.add_event('autodoc-skip-member')