Split The Signature Module After The Project Split

The PySide project has been split into three pieces, including
Shiboken. This had far-reaching consequences for the signature project.

Shiboken can be run together with PySide or alone,
with tests or without. In every configuration, the signature
module has to work correctly.

During tests, the shiboken binary also hides the shiboken module,
and we had to use extra efforts to always guarantee the accessibility
of all signature modules.

This commit is the preparation for typeerrors implemented with the
signature module. It has been split off because the splitting
is not directly related, besides these unawaited consequences.

I re-added and corrected voidptr_test and simplified the calls.
Remark.. We should rename shiboken to Shiboken in all imports.

I also simplified initialization. After "from PySide2 import QtCore",
now a simple access like "type.__signature__" triggers initialization.

Further, I removed all traces of "signature_loader" and allowed
loading everything from PySide2.support.signature, again. The
loader is now needed internally, only.

Also, moved the type patching into FinishSignatureInitialization
to support modules with no classes at all.

The "testbinding" problem was finally identified as a name clash
when the same function is also a signal. A further investigation
showed that there exists also a regular PySide method with
that problem. The test was extended to all methods, and it
maps now all these cases to "{name}.overload".

Updated the included typing27.py from https://pypi.org/project/typing/
from version 3.6.2 to version 3.6.6 .

Task-number: PYSIDE-749
Change-Id: Ie33b8c6b0df5640212f8991539088593a041a05c
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>

2 files changed, 175 insertions, 0 deletions

diff --git a/sources/shiboken2/shibokenmodule/support/signature/lib/__init__.py b/sources/shiboken2/shibokenmodule/support/signature/lib/__init__.py
new file mode 100644
index 000000000..2d640cb89
--- /dev/null
+++ b/sources/shiboken2/shibokenmodule/support/signature/lib/__init__.py
@@ -0,0 +1,40 @@
+#############################################################################
+##
+## 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.
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+# this file intentionally left blank
diff --git a/sources/shiboken2/shibokenmodule/support/signature/lib/enum_sig.py b/sources/shiboken2/shibokenmodule/support/signature/lib/enum_sig.py
new file mode 100644
index 000000000..2ec14d62b
--- /dev/null
+++ b/sources/shiboken2/shibokenmodule/support/signature/lib/enum_sig.py
@@ -0,0 +1,135 @@
+#############################################################################
+##
+## 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
+
+import sys
+from signature_loader import get_signature, inspect
+
+
+class ExactEnumerator(object):
+    """
+    ExactEnumerator enumerates all signatures in a module as they are.
+
+    This class is used for generating complete listings of all signatures.
+    An appropriate formatter should be supplied, if printable output
+    is desired.
+    """
+    def __init__(self, formatter, result_type=dict):
+        self.fmt = formatter
+        self.result_type = result_type
+
+    def module(self, mod_name):
+        __import__(mod_name)
+        with self.fmt.module(mod_name):
+            module = sys.modules[mod_name]
+            members = inspect.getmembers(module, inspect.isclass)
+            functions = inspect.getmembers(module, inspect.isroutine)
+            ret = self.result_type()
+            self.fmt.class_name = None
+            for func_name, func in functions:
+                ret.update(self.function(func_name, func))
+            for class_name, klass in members:
+                ret.update(self.klass(class_name, klass))
+            return ret
+
+    def klass(self, class_name, klass):
+        bases_list = []
+        for base in klass.__bases__:
+            name = base.__name__
+            if name == "object":
+                pass
+            else:
+                modname = base.__module__
+                name = modname + "." + base.__name__
+            bases_list.append(name)
+        class_str = "{}({})".format(class_name, ", ".join(bases_list))
+        with self.fmt.klass(class_name, class_str):
+            ret = self.function("__init__", klass)
+            # class_members = inspect.getmembers(klass)
+            # gives us also the inherited things.
+            class_members = sorted(list(klass.__dict__.items()))
+            subclasses = []
+            for thing_name, thing in class_members:
+                if inspect.isclass(thing):
+                    subclass_name = ".".join((class_name, thing_name))
+                    subclasses.append((subclass_name, thing))
+                else:
+                    ret.update(self.function(thing_name, thing))
+            for subclass_name, subclass in subclasses:
+                ret.update(self.klass(subclass_name, subclass))
+            return ret
+
+    def function(self, func_name, func):
+        ret = self.result_type()
+        signature = getattr(func, '__signature__', None)
+        if signature is not None:
+            with self.fmt.function(func_name, signature) as key:
+                ret[key] = str(signature)
+        return ret
+
+
+def stringify(signature):
+    if isinstance(signature, list):
+        # remove duplicates which still sometimes occour:
+        ret = set(stringify(sig) for sig in signature)
+        return sorted(ret) if len(ret) > 1 else list(ret)[0]
+    return tuple(str(pv) for pv in signature.parameters.values())
+
+
+class SimplifyingEnumerator(ExactEnumerator):
+    """
+    SimplifyingEnumerator enumerates all signatures in a module filtered.
+
+    There are no default values, no variable
+    names and no self parameter. Only types are present after simplification.
+    The functions 'next' resp. '__next__' are removed
+    to make the output identical for Python 2 and 3.
+    An appropriate formatter should be supplied, if printable output
+    is desired.
+    """
+
+    def function(self, func_name, func):
+        ret = self.result_type()
+        signature = get_signature(func, 'existence')
+        sig = stringify(signature) if signature is not None else None
+        if sig is not None and func_name not in ("next", "__next__", "__div__"):
+            with self.fmt.function(func_name, sig) as key:
+                ret[key] = sig
+        return ret