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"""CPython-specific touch-ups"""

import ctypes

import importlib.util

from . import _stdcpp_fix # noqa: F401

__all__ = [

"gbl",

"load_reflection_info",

"addressof",

"bind_object",

"nullptr",

"default",

"_backend",

"_begin_capture_stderr",

"_end_capture_stderr",

]

def _preload_backend_library():

# preload the merged extension with ctypes and run LoadCppInterOp() first,

# so the interpreter is ready before the extension module initializes

spec = importlib.util.find_spec("cppjit.libcppjit")

if spec is None or not spec.origin:

raise ImportError("cannot locate the cppjit.libcppjit extension module")

lib = ctypes.CDLL(spec.origin, ctypes.RTLD_GLOBAL)

if not lib.LoadCppInterOp():

raise RuntimeError(

"cppjit could not initialize its C++ interpreter, see the diagnostic "

"above (LoadCppInterOp failed)"

)

return lib

_w = _preload_backend_library()

from . import libcppjit as _backend # noqa: E402

### template support ---------------------------------------------------------

class Template(object): # expected/used by ProxyWrappers.cxx in cpyrt

stl_sequence_types = ["std::vector", "std::list", "std::set", "std::deque"]

stl_unrolled_types = ["std::pair"]

stl_fixed_size_types = ["std::array"]

stl_mapping_types = ["std::map", "std::unordered_map"]

def __init__(self, name, scope):

self.__name__ = name

self.__cpp_name__ = name

self._instantiations = dict()

self.__scope__ = scope

def __repr__(self):

return "<cppjit.Template '%s' object at %s>" % (self.__name__, hex(id(self)))

def __getitem__(self, *args):

# multi-argument to [] becomes a single tuple argument

if args and isinstance(args[0], tuple):

args = args[0]

# if already instantiated, return the existing class

try:

return self._instantiations[args]

except KeyError:

pass

# construct the type name from the types or their string representation

newargs = [self.__scope__]

for arg in args:

if isinstance(arg, str):

arg = ",".join(map(lambda x: x.strip(), arg.split(",")))

newargs.append(arg)

pyclass = _backend.MakeCppTemplateClass(*newargs)

# memoize the class to prevent spurious lookups/re-pythonizations

self._instantiations[args] = pyclass

# special case pythonization (builtin_map is not available from the C-API)

if "push_back" in pyclass.__dict__ and "__iadd__" not in pyclass.__dict__:

if "reserve" in pyclass.__dict__:

def iadd(self, ll):

self.reserve(len(ll))

for x in ll:

self.push_back(x)

return self

else:

def iadd(self, ll):

for x in ll:

self.push_back(x)

return self

pyclass.__iadd__ = iadd

# back-pointer for reflection

pyclass.__cpp_template__ = self

return pyclass

def __call__(self, *args):

# for C++17, we're required to derive the type when using initializer syntax

# (i.e. a tuple or list); not sure how to do that in general, but below the

# most common cases are covered

if args:

args0 = args[0]

if args0 and isinstance(args0, (tuple, list)):

t = type(args0[0])

if t is float:

t = "double"

if self.__name__ in self.stl_sequence_types:

return self[t](*args)

if self.__name__ in self.stl_fixed_size_types:

return self[t, len(args0)](*args)

if self.__name__ in self.stl_unrolled_types:

return self[tuple(type(a) for a in args0)](*args0)

if args0 and isinstance(args0, dict):

if self.__name__ in self.stl_mapping_types:

try:

pair = args0.items().__iter__().__next__()

except AttributeError:

pair = args0.items()[0]

t1 = type(pair[0])

if t1 is float:

t1 = "double"

t2 = type(pair[1])

if t2 is float:

t2 = "double"

return self[t1, t2](*args)

return self.__getitem__(*(type(a) for a in args0))(*args)

# old 'metaclass-style' template instantiations

return self.__getitem__(*args)

_backend.Template = Template

# - :: and std:: namespaces ---------------------------------------------------

gbl = _backend.CreateScopeProxy("")

gbl.__class__.__repr__ = lambda cls: "<namespace cppjit.gbl at 0x%x>" % id(cls)

gbl.std = _backend.CreateScopeProxy("std")

# for move, we want our "pythonized" one, not the C++ template

gbl.std.move = _backend.move

# CppInterOp proxy object to access its API

Cpp = gbl.Cpp

# - add to the dynamic path as needed -----------------------------------------

import os # noqa: E402

def _add_default_paths():

if os.getenv("CONDA_PREFIX"):

# MacOS, Linux

lib_path = os.path.join(os.getenv("CONDA_PREFIX"), "lib")

if os.path.exists(lib_path):

Cpp.AddSearchPath(lib_path, True, False)

# Windows

lib_path = os.path.join(os.getenv("CONDA_PREFIX"), "Library", "lib")

if os.path.exists(lib_path):

Cpp.AddSearchPath(lib_path, True, False)

# assuming that we are in PREFIX/lib/python/site-packages/cppjit, add PREFIX/lib to the search path

lib_path = os.path.abspath(

os.path.join(

os.path.dirname(__file__), os.path.pardir, os.path.pardir, os.path.pardir

)

if os.path.exists(lib_path):

Cpp.AddSearchPath(lib_path, True, False)

try:

with open("/etc/ld.so.conf") as ldconf:

for line in ldconf:

f = line.strip()

if os.path.exists(f):

Cpp.AddSearchPath(f, True, False)

except IOError:

pass

_add_default_paths()

# - exports -------------------------------------------------------------------

addressof = _backend.addressof

bind_object = _backend.bind_object

nullptr = _backend.nullptr

default = _backend.default

def load_reflection_info(name):

# with _stderr_capture() as err:

# FIXME: Remove the .so and add logic in libcppinterop

name = name + ".so"

result = Cpp.LoadLibrary(name, True)

if name.endswith("Dict.so"):

header = name[:-7] + ".h"

Cpp.Declare('#include "' + header + '"', False)

if result == False: # noqa: E712

raise RuntimeError('Could not load library "%s"' % (name))

return True

def _begin_capture_stderr():

_backend._begin_capture_stderr()

def _end_capture_stderr():

err = _backend._end_capture_stderr()

if err:

try:

return "\n%s" % err

except UnicodeDecodeError as e:

original_error = e

try:

return "\n%s" % err.decode("gbk") # not guaranteed, but common

except UnicodeDecodeError:

pass

return "C++ issued an error message that could not be decoded (%s)" % str(

original_error

)

return ""