Simplify Python Imports For Embedding

After the project split, shiboken exposed its own modules, and the
overall structure with shiboken2.support.signature and
PySide2.support.signature was already quite complicated.

When introducing embedding, it is necessary to have some support
folder that gets unpacked from a zipfile. That means, the shiboken2
root directory would be in the zip file in the embedding case.

This does not only increase the complexity, it further means
that we must make shiboken2.so available in the shiboken2
containing zipfile!

In order to avoid that, we stop the dependency from the two
support directories and use shibokensupport, instead. The
simplification of the loader and other modules is also significant.

Task-number: PYSIDE-510
Change-Id: Ic735a8d36f10f03698378f2ac9685a5955e40b0c
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 168 insertions, 0 deletions

diff --git a/sources/shiboken2/shibokenmodule/files.dir/shibokensupport/signature/lib/enum_sig.py b/sources/shiboken2/shibokenmodule/files.dir/shibokensupport/signature/lib/enum_sig.py
new file mode 100644
index 000000000..90affbcfd
--- /dev/null
+++ b/sources/shiboken2/shibokenmodule/files.dir/shibokensupport/signature/lib/enum_sig.py
@@ -0,0 +1,168 @@
+#############################################################################
+##
+## 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
+
+"""
+enum_sig.py
+
+Enumerate all signatures of a class.
+
+This module separates the enumeration process from the formatting.
+It is not easy to adhere to this protocol, but in the end, it paid off
+by producing a lot of clarity.
+"""
+
+import sys
+from shibokensupport.signature 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):
+        if not "Shiboken" in repr(klass.mro()):
+            # don't look into any foreign classes!
+            ret = self.result_type()
+            return ret
+        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:
+                    func_name = thing_name.split(".")[0]   # remove ".overload"
+                    ret.update(self.function(func_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] = 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
+
+class HintingEnumerator(ExactEnumerator):
+    """
+    HintingEnumerator enumerates all signatures in a module slightly changed.
+
+    This class is used for generating complete listings of all signatures for
+    hinting stubs. Only default values are replaced by "...".
+    """
+
+    def function(self, func_name, func):
+        ret = self.result_type()
+        signature = get_signature(func, 'hintingstub')
+        if signature is not None:
+            with self.fmt.function(func_name, signature) as key:
+                ret[key] = signature
+        return ret
+