diff options
Diffstat (limited to 'sources/shiboken2/shibokenmodule/support/signature/layout.py')
| -rw-r--r-- | sources/shiboken2/shibokenmodule/support/signature/layout.py | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/sources/shiboken2/shibokenmodule/support/signature/layout.py b/sources/shiboken2/shibokenmodule/support/signature/layout.py new file mode 100644 index 000000000..47f97fc2b --- /dev/null +++ b/sources/shiboken2/shibokenmodule/support/signature/layout.py @@ -0,0 +1,245 @@ +############################################################################# +## +## Copyright (C) 2018 The Qt Company Ltd. +## Contact: https://www.qt.io/licensing/ +## +## This file is part of Qt for Python. +## +## $QT_BEGIN_LICENSE:LGPL$ +## Commercial License Usage +## Licensees holding valid commercial Qt licenses may use this file in +## accordance with the commercial license agreement provided with the +## Software or, alternatively, in accordance with the terms contained in +## a written agreement between you and The Qt Company. For licensing terms +## and conditions see https://www.qt.io/terms-conditions. For further +## information use the contact form at https://www.qt.io/contact-us. +## +## GNU Lesser General Public License Usage +## Alternatively, this file may be used under the terms of the GNU Lesser +## General Public License version 3 as published by the Free Software +## Foundation and appearing in the file LICENSE.LGPL3 included in the +## packaging of this file. Please review the following information to +## ensure the GNU Lesser General Public License version 3 requirements +## will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +## +## GNU General Public License Usage +## Alternatively, this file may be used under the terms of the GNU +## General Public License version 2.0 or (at your option) the GNU General +## Public license version 3 or any later version approved by the KDE Free +## Qt Foundation. The licenses are as published by the Free Software +## Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +## included in the packaging of this file. Please review the following +## information to ensure the GNU General Public License requirements will +## be met: https://www.gnu.org/licenses/gpl-2.0.html and +## https://www.gnu.org/licenses/gpl-3.0.html. +## +## $QT_END_LICENSE$ +## +############################################################################# + +from __future__ import print_function, absolute_import + +""" +layout.py + +The signature module now has the capability to configure +differently formatted versions of signatures. The default +layout is known from the "__signature__" attribute. + +The function "get_signature(ob, modifier=None)" produces the same +signatures by default. By passing different modifiers, you +can select different layouts. + +This module configures the different layouts which can be used. +It also implements them in this file. The configurations are +used literally as strings like "signature", "existence", etc. +""" + +from textwrap import dedent +from signature_loader import inspect + + +class SimpleNamespace(object): + # From types.rst, because the builtin is implemented in Python 3, only. + def __init__(self, **kwargs): + self.__dict__.update(kwargs) + + def __repr__(self): + keys = sorted(self.__dict__) + items = ("{}={!r}".format(k, self.__dict__[k]) for k in keys) + return "{}({})".format(type(self).__name__, ", ".join(items)) + + def __eq__(self, other): + return self.__dict__ == other.__dict__ + + +class SignatureLayout(SimpleNamespace): + """ + Configure a signature. + + The layout of signatures can have different layouts which are + controlled by keyword arguments: + + definition=True Determines if self will generated. + defaults=True + ellipsis=False Replaces defaults by "...". + return_annotation=True + parameter_names=True False removes names before ":". + """ + allowed_keys = SimpleNamespace(definition=True, + defaults=True, + ellipsis=False, + return_annotation=True, + parameter_names=True) + allowed_values = True, False + + def __init__(self, **kwds): + args = SimpleNamespace(**self.allowed_keys.__dict__) + args.__dict__.update(kwds) + self.__dict__.update(args.__dict__) + err_keys = list(set(self.__dict__) - set(self.allowed_keys.__dict__)) + if err_keys: + self._attributeerror(err_keys) + err_values = list(set(self.__dict__.values()) - set(self.allowed_values)) + if err_values: + self._valueerror(err_values) + + def __setattr__(self, key, value): + if key not in self.allowed_keys.__dict__: + self._attributeerror([key]) + if value not in self.allowed_values: + self._valueerror([value]) + self.__dict__[key] = value + + def _attributeerror(self, err_keys): + err_keys = ", ".join(err_keys) + allowed_keys = ", ".join(self.allowed_keys.__dict__.keys()) + raise AttributeError(dedent("""\ + Not allowed: '{err_keys}'. + The only allowed keywords are '{allowed_keys}'. + """.format(**locals()))) + + def _valueerror(self, err_values): + err_values = ", ".join(map(str, err_values)) + allowed_values = ", ".join(map(str, self.allowed_values)) + raise ValueError(dedent("""\ + Not allowed: '{err_values}'. + The only allowed values are '{allowed_values}'. + """.format(**locals()))) + +# The following names are used literally in this module. +# This way, we avoid the dict hashing problem. +signature = SignatureLayout() + +existence = SignatureLayout(definition=False, + defaults=False, + return_annotation=False, + parameter_names=False) + +hintingstub = SignatureLayout(ellipsis=True) + +typeerror = SignatureLayout(definition=False, + return_annotation=False, + parameter_names=False) + + +def define_nameless_parameter(): + """ + Create Nameless Parameters + + A nameless parameter has a reduced string representation. + This is done by cloning the parameter type and overwriting its + __str__ method. The inner structure is still a valid parameter. + """ + def __str__(self): + # for Python 2, we must change self to be an instance of P + klass = self.__class__ + self.__class__ = P + txt = P.__str__(self) + self.__class__ = klass + txt = txt[txt.index(":") + 1:].strip() if ":" in txt else txt + return txt + + P = inspect.Parameter + newname = "NamelessParameter" + bases = P.__bases__ + body = dict(P.__dict__) # get rid of mappingproxy + if "__slots__" in body: + # __slots__ would create duplicates + for name in body["__slots__"]: + del body[name] + body["__str__"] = __str__ + return type(newname, bases, body) + + +NamelessParameter = define_nameless_parameter() + + +def make_signature_nameless(signature): + """ + Make a Signature Nameless + + We use an existing signature and change the type of its parameters. + The signature looks different, but is totally intact. + """ + for key in signature.parameters.keys(): + signature.parameters[key].__class__ = NamelessParameter + + +def create_signature(props, key): + if not props: + # empty signatures string + return + if isinstance(props["multi"], list): + # multi sig: call recursively + return list(create_signature(elem, key) + for elem in props["multi"]) + if type(key) is tuple: + sig_kind, modifier = key + else: + sig_kind, modifier = key, "signature" + + layout = globals()[modifier] # lookup of the modifier in this module + if not isinstance(layout, SignatureLayout): + raise SystemError("Modifiers must be names of a SignatureLayout " + "instance") + + # this is the basic layout of a signature + varnames = props["varnames"] + if layout.definition: + if sig_kind == "function": + pass + elif sig_kind == "method": + varnames = ("self",) + varnames + elif sig_kind == "staticmethod": + pass + elif sig_kind == "classmethod": + varnames = ("klass",) + varnames + else: + raise SystemError("Methods must be function, method, staticmethod or " + "classmethod") + # calculate the modifications + defaults = props["defaults"][:] + if not layout.defaults: + defaults = () + if layout.ellipsis: + defaults = ("...",) * len(defaults) + annotations = props["annotations"].copy() + if not layout.return_annotation and "return" in annotations: + del annotations["return"] + + # attach parameters to a fake function and build a signature + argstr = ", ".join(varnames) + fakefunc = eval("lambda {}: None".format(argstr)) + fakefunc.__name__ = props["name"] + fakefunc.__defaults__ = defaults + fakefunc.__kwdefaults__ = props["kwdefaults"] + fakefunc.__annotations__ = annotations + sig = inspect._signature_from_function(inspect.Signature, fakefunc) + + # the special case of nameless parameters + if not layout.parameter_names: + make_signature_nameless(sig) + return sig + +# end of file |