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>

1 files changed, 199 insertions, 0 deletions

diff --git a/sources/shiboken2/shibokenmodule/support/signature/mapping.py b/sources/shiboken2/shibokenmodule/support/signature/mapping.py
new file mode 100644
index 000000000..724b0c751
--- /dev/null
+++ b/sources/shiboken2/shibokenmodule/support/signature/mapping.py
@@ -0,0 +1,199 @@
+#############################################################################
+##
+## 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
+
+"""
+mapping.py
+
+This module has the mapping from the pyside C-modules view of signatures
+to the Python representation.
+
+The PySide modules are not loaded in advance, but only after they appear
+in sys.modules. This minimizes the loading overhead.
+"""
+
+import sys
+import struct
+import os
+import pkgutil
+
+from signature_loader import typing
+
+ellipsis = "..."
+Char = typing.Union[str, int]     # how do I model the limitation to 1 char?
+StringList = typing.List[str]
+IntList = typing.List[int]
+Point = typing.Tuple[float, float]
+PointList = typing.List[Point]
+IntMatrix = typing.List[IntList]
+Variant = typing.Any
+ModelIndexList = typing.List[int]
+QImageCleanupFunction = typing.Callable
+FloatList = typing.List[float]
+FloatMatrix = typing.List[FloatList]
+# Pair could be more specific, but we loose the info in the generator.
+Pair = typing.Tuple[typing.Any, typing.Any]
+MultiMap = typing.DefaultDict[str, typing.List[str]]
+
+# ulong_max is only 32 bit on windows.
+ulong_max = 2*sys.maxsize+1 if len(struct.pack("L", 1)) != 4 else 0xffffffff
+ushort_max = 0xffff
+
+GL_COLOR_BUFFER_BIT = 0x00004000
+GL_NEAREST = 0x2600
+
+WId = int
+
+# from 5.9
+GL_TEXTURE_2D = 0x0DE1
+GL_RGBA = 0x1908
+
+class _NotCalled(str):
+    """
+    Wrap some text with semantics
+
+    This class is wrapped around text in order to avoid calling it.
+    There are three reasons for this:
+
+      - some instances cannot be created since they are abstract,
+      - some can only be created after qApp was created,
+      - some have an ugly __repr__ with angle brackets in it.
+
+    By using derived classes, good looking instances can be created
+    which can be used to generate source code or .pyi files. When the
+    real object is needed, the wrapper can simply be called.
+    """
+    def __repr__(self):
+        suppress = "PySide2.support.signature.typing."
+        text = self[len(suppress):] if self.startswith(suppress) else self
+        return "{}({})".format(type(self).__name__, text)
+
+    def __call__(self):
+        from signature_loader.mapping import __dict__ as namespace
+        text = self if self.endswith(")") else self + "()"
+        return eval(text, namespace)
+
+# Some types are abstract. They just show their name.
+class Virtual(_NotCalled):
+    pass
+
+# Other types I simply could not find.
+class Missing(_NotCalled):
+    pass
+
+class Invalid(_NotCalled):
+    pass
+
+# Helper types
+class Default(_NotCalled):
+    pass
+
+class Instance(_NotCalled):
+    pass
+
+
+class Reloader(object):
+    _uninitialized = ["sample"]
+    _prefixes = [""]
+
+    def __init__(self):
+        self.sys_module_count = 0
+        self.uninitialized = self._uninitialized
+
+    def update(self, g=None):
+        if self.sys_module_count == len(sys.modules):
+            return
+        self.sys_module_count = len(sys.modules)
+        if g is None:
+            g = globals()
+        for mod_name in self.uninitialized[:]:
+            for prefix in self._prefixes:
+                if prefix + mod_name in sys.modules:
+                    self.uninitialized.remove(mod_name)
+                    proc_name = "init_" + mod_name
+                    if proc_name in g:
+                        g.update(g[proc_name]())
+
+
+update_mapping = Reloader().update
+type_map = {}
+
+
+def init_sample():
+    import sample
+    import datetime
+    type_map.update({
+        "sample.int": int,
+        "Complex": complex,
+        "sample.OddBool": bool,
+        "sample.bool": bool,
+        "sample.PStr": str,
+        "double[]": FloatList,
+        "OddBool": bool,
+        "PStr": str,
+        "sample.char": Char,
+        "double[][]": FloatMatrix,
+        "int[]": IntList,
+        "int[][]": IntMatrix,
+        "sample.Point": Point,
+        "sample.ObjectType": object,
+        "std.string": str,
+        "HANDLE": int,
+        "Foo.HANDLE": int,
+        "sample.Photon.TemplateBase": Missing("sample.Photon.TemplateBase"),
+        "ObjectType.Identifier": Missing("sample.ObjectType.Identifier"),
+        "zero(HANDLE)": 0,
+        "Null": None,
+        "zero(sample.ObjectType)": None,
+        "std.size_t": int,
+        'Str("<unknown>")': "<unknown>",
+        'Str("<unk")': "<unk",
+        'Str("nown>")': "nown>",
+        "zero(sample.ObjectModel)": None,
+        "sample.unsigned char": Char,
+        "sample.double": float,
+        "zero(sample.bool)": False,
+        "PyDate": datetime.date,
+        "ZeroIn": 0,
+        "Point[]": PointList,
+    })
+    return locals()
+
+# end of file