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from __future__ import print_function, absolute_import

"""
This file was originally directly embedded into the C source.
After it grew more and more, I now prefer to have it as Python file.
The remaining stub loader is a short string now.

The loader has to lazy-load the signature module and also provides a few
Python modules that I consider essential and therefore built-in.
This version does not use an embedded .zip file.
"""

import sys
import os

# Make sure that we always have the PySide containing package first.
# This is crucial for the mapping during reload in the tests.
package_dir = __file__
for _ in "four":
    package_dir = os.path.dirname(package_dir)
sys.path.insert(0, package_dir)
if sys.version_info >= (3,):
    from PySide2.support.signature import inspect
else:
    import inspect
    namespace = inspect.__dict__
    from PySide2.support.signature import backport_inspect as inspect
    inspect.__dict__.update(namespace)
# name used in signature.cpp
from PySide2.support.signature.parser import pyside_type_init
sys.path.pop(0)
# Note also that during the tests we have a different encoding that would
# break the Python license decorated files without an encoding line.

# name used in signature.cpp
def create_signature(props, sig_kind):
    if not props:
        # empty signatures string
        return
    if isinstance(props["multi"], list):
        return list(create_signature(elem, sig_kind)
                    for elem in props["multi"])
    varnames = props["varnames"]
    if sig_kind == "method":
        varnames = ("self",) + varnames
    elif sig_kind == "staticmethod":
        pass
    elif sig_kind == "classmethod":
        varnames = ("klass",) + varnames
    else:
        raise SystemError("Methods must be normal, staticmethod or "
                          "classmethod")
    argstr = ", ".join(varnames)
    fakefunc = eval("lambda {}: None".format(argstr))
    fakefunc.__name__ = props["name"]
    fakefunc.__defaults__ = props["defaults"]
    fakefunc.__kwdefaults__ = props["kwdefaults"]
    fakefunc.__annotations__ = props["annotations"]
    return inspect._signature_from_function(inspect.Signature, fakefunc)

# end of file
