# encoding: utf-8 # The MIT License # # Copyright (c) 2009-2011 the bpython authors. # Copyright (c) 2015 Sebastian Ramacher # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN # THE SOFTWARE. # import inspect import io import keyword import pydoc from collections import namedtuple from six.moves import range from pygments.token import Token from bpython._py3compat import PythonLexer, py3 from bpython.lazyre import LazyReCompile if not py3: import types _name = LazyReCompile(r'[a-zA-Z_]\w*$') ArgSpec = namedtuple('ArgSpec', ['args', 'varargs', 'varkwargs', 'defaults', 'kwonly', 'kwonly_defaults', 'annotations']) FuncProps = namedtuple('FuncProps', ['func', 'argspec', 'is_bound_method']) class AttrCleaner(object): """A context manager that tries to make an object not exhibit side-effects on attribute lookup.""" def __init__(self, obj): self.obj = obj def __enter__(self): """Try to make an object not exhibit side-effects on attribute lookup.""" type_ = type(self.obj) __getattribute__ = None __getattr__ = None # Dark magic: # If __getattribute__ doesn't exist on the class and __getattr__ does # then __getattr__ will be called when doing # getattr(type_, '__getattribute__', None) # so we need to first remove the __getattr__, then the # __getattribute__, then look up the attributes and then restore the # original methods. :-( # The upshot being that introspecting on an object to display its # attributes will avoid unwanted side-effects. if py3 or type_ != types.InstanceType: __getattr__ = getattr(type_, '__getattr__', None) if __getattr__ is not None: try: setattr(type_, '__getattr__', (lambda *_, **__: None)) except TypeError: __getattr__ = None __getattribute__ = getattr(type_, '__getattribute__', None) if __getattribute__ is not None: try: setattr(type_, '__getattribute__', object.__getattribute__) except TypeError: # XXX: This happens for e.g. built-in types __getattribute__ = None self.attribs = (__getattribute__, __getattr__) # /Dark magic def __exit__(self, exc_type, exc_val, exc_tb): """Restore an object's magic methods.""" type_ = type(self.obj) __getattribute__, __getattr__ = self.attribs # Dark magic: if __getattribute__ is not None: setattr(type_, '__getattribute__', __getattribute__) if __getattr__ is not None: setattr(type_, '__getattr__', __getattr__) # /Dark magic class _Repr(object): """ Helper for `fixlongargs()`: Returns the given value in `__repr__()`. """ def __init__(self, value): self.value = value def __repr__(self): return self.value __str__ = __repr__ def parsekeywordpairs(signature): tokens = PythonLexer().get_tokens(signature) preamble = True stack = [] substack = [] parendepth = 0 for token, value in tokens: if preamble: if token is Token.Punctuation and value == u"(": preamble = False continue if token is Token.Punctuation: if value in [u'(', u'{', u'[']: parendepth += 1 elif value in [u')', u'}', u']']: parendepth -= 1 elif value == ':' and parendepth == -1: # End of signature reached break if ((value == ',' and parendepth == 0) or (value == ')' and parendepth == -1)): stack.append(substack) substack = [] continue if value and (parendepth > 0 or value.strip()): substack.append(value) d = {} for item in stack: if len(item) >= 3: d[item[0]] = ''.join(item[2:]) return d def fixlongargs(f, argspec): """Functions taking default arguments that are references to other objects whose str() is too big will cause breakage, so we swap out the object itself with the name it was referenced with in the source by parsing the source itself !""" if argspec[3] is None: # No keyword args, no need to do anything return values = list(argspec[3]) if not values: return keys = argspec[0][-len(values):] try: src = inspect.getsourcelines(f) except (IOError, IndexError): # IndexError is raised in inspect.findsource(), can happen in # some situations. See issue #94. return signature = ''.join(src[0]) kwparsed = parsekeywordpairs(signature) for i, (key, value) in enumerate(zip(keys, values)): if len(repr(value)) != len(kwparsed[key]): values[i] = _Repr(kwparsed[key]) argspec[3] = values getpydocspec_re = LazyReCompile(r'([a-zA-Z_][a-zA-Z0-9_]*?)\((.*?)\)') def getpydocspec(f, func): try: argspec = pydoc.getdoc(f) except NameError: return None s = getpydocspec_re.search(argspec) if s is None: return None if not hasattr(f, '__name__') or s.groups()[0] != f.__name__: return None args = list() defaults = list() varargs = varkwargs = None kwonly_args = list() kwonly_defaults = dict() for arg in s.group(2).split(','): arg = arg.strip() if arg.startswith('**'): varkwargs = arg[2:] elif arg.startswith('*'): varargs = arg[1:] else: arg, _, default = arg.partition('=') if varargs is not None: kwonly_args.append(arg) if default: kwonly_defaults[arg] = default else: args.append(arg) if default: defaults.append(default) return ArgSpec(args, varargs, varkwargs, defaults, kwonly_args, kwonly_defaults, None) def getfuncprops(func, f): # Check if it's a real bound method or if it's implicitly calling __init__ # (i.e. FooClass(...) and not FooClass.__init__(...) -- the former would # not take 'self', the latter would: try: func_name = getattr(f, '__name__', None) except: # if calling foo.__name__ would result in an error func_name = None try: is_bound_method = ((inspect.ismethod(f) and f.__self__ is not None) or (func_name == '__init__' and not func.endswith('.__init__')) or (func_name == '__new__' and not func.endswith('.__new__'))) except: # if f is a method from a xmlrpclib.Server instance, func_name == # '__init__' throws xmlrpclib.Fault (see #202) return None try: if py3: argspec = inspect.getfullargspec(f) else: argspec = inspect.getargspec(f) argspec = list(argspec) fixlongargs(f, argspec) if len(argspec) == 4: argspec = argspec + [list(), dict(), None] argspec = ArgSpec(*argspec) fprops = FuncProps(func, argspec, is_bound_method) except (TypeError, KeyError): with AttrCleaner(f): argspec = getpydocspec(f, func) if argspec is None: return None if inspect.ismethoddescriptor(f): argspec.args.insert(0, 'obj') fprops = FuncProps(func, argspec, is_bound_method) return fprops def is_eval_safe_name(string): if py3: return all(part.isidentifier() and not keyword.iskeyword(part) for part in string.split('.')) else: return all(_name.match(part) and not keyword.iskeyword(part) for part in string.split('.')) def is_callable(obj): return callable(obj) get_encoding_re = LazyReCompile(r'coding[:=]\s*([-\w.]+)') def get_encoding(obj): """Try to obtain encoding information of the source of an object.""" for line in inspect.findsource(obj)[0][:2]: m = get_encoding_re.search(line) if m: return m.group(1) return 'ascii' def get_encoding_file(fname): """Try to obtain encoding information from a Python source file.""" with io.open(fname, 'rt', encoding='ascii', errors='ignore') as f: for unused in range(2): line = f.readline() match = get_encoding_re.search(line) if match: return match.group(1) return 'ascii' if py3: def get_source_unicode(obj): """Returns a decoded source of object""" return inspect.getsource(obj) else: def get_source_unicode(obj): """Returns a decoded source of object""" return inspect.getsource(obj).decode(get_encoding(obj))