the beginning of a painful migration

README.md

@@ -51,6 +51,10 @@ For more examples converting `data.frame`, `dgCMatrix`, `dgRMatrix`, `dgTMatrix`
 
 This project uses Cython to provide bindings from C++ to Python.
 
+```shell
+cpptypes src/rds2py/lib --py src/rds2py/_cpphelpers.py --cpp src/rds2py/lib/bindings.cpp --dll _core
+```
+
 Steps to setup dependencies -
 
 - git submodules is initialized in `extern/rds2cpp`

bindings.cpp

@@ -0,0 +1,58 @@
+/* DO NOT MODIFY: this is automatically generated by the cpptypes */
+
+#include <cstring>
+#include <stdexcept>
+#include <cstdint>
+
+#ifdef _WIN32
+#define PYAPI __declspec(dllexport)
+#else
+#define PYAPI
+#endif
+
+static char* copy_error_message(const char* original) {
+    auto n = std::strlen(original);
+    auto copy = new char[n + 1];
+    std::strcpy(copy, original);
+    return copy;
+}
+
+inline uintptr_t py_parser_extract_robject(uintptr_t);
+
+inline uintptr_t py_parser_rds_file(std::string);
+
+extern "C" {
+
+PYAPI void free_error_message(char** msg) {
+    delete [] *msg;
+}
+
+PYAPI inline uintptr_t py_py_parser_extract_robject(uintptr_t ptr, int32_t* errcode, char** errmsg) {
+    inline uintptr_t output = 0;
+    try {
+        output = py_parser_extract_robject(ptr);
+    } catch(std::exception& e) {
+        *errcode = 1;
+        *errmsg = copy_error_message(e.what());
+    } catch(...) {
+        *errcode = 1;
+        *errmsg = copy_error_message("unknown C++ exception");
+    }
+    return output;
+}
+
+PYAPI inline uintptr_t py_py_parser_rds_file(std::string file, int32_t* errcode, char** errmsg) {
+    inline uintptr_t output = 0;
+    try {
+        output = py_parser_rds_file(file);
+    } catch(std::exception& e) {
+        *errcode = 1;
+        *errmsg = copy_error_message(e.what());
+    } catch(...) {
+        *errcode = 1;
+        *errmsg = copy_error_message("unknown C++ exception");
+    }
+    return output;
+}
+
+}

bindings.py

@@ -0,0 +1,33 @@
+# DO NOT MODIFY: this is automatically generated by the cpptypes
+
+import os
+import ctypes as ct
+
+
+def _catch_errors(f):
+    def wrapper(*args):
+        errcode = ct.c_int32(0)
+        errmsg = ct.c_char_p(0)
+        output = f(*args, ct.byref(errcode), ct.byref(errmsg))
+        if errcode.value != 0:
+            msg = errmsg.value.decode("ascii")
+            lib.free_error_message(errmsg)
+            raise RuntimeError(msg)
+        return output
+
+    return wrapper
+
+
+# TODO: surely there's a better way than whatever this is.
+dirname = os.path.dirname(os.path.abspath(__file__))
+contents = os.listdir(dirname)
+lib = None
+for x in contents:
+    if x.startswith("core") and not x.endswith("py"):
+        lib = ct.CDLL(os.path.join(dirname, x))
+        break
+
+if lib is None:
+    raise ImportError("failed to find the core.* module")
+
+lib.free_error_message.argtypes = [ct.POINTER(ct.c_char_p)]

setup.py

@@ -5,34 +5,30 @@
 Learn more under: https://pyscaffold.org/
 """
 import numpy
-from Cython.Build import cythonize
 from setuptools import setup
 from setuptools.extension import Extension
 
 if __name__ == "__main__":
     try:
         setup(
             use_scm_version={"version_scheme": "no-guess-dev"},
-            ext_modules=cythonize(
-                [
-                    Extension(
-                        "rds2py.core",
-                        ["src/rds2py/lib/rds_parser.cpp", "src/rds2py/lib/parser.pyx"],
-                        include_dirs=[
-                            "extern/rds2cpp/include",
-                            "extern/rds2cpp/_deps/byteme-src/include",
-                            numpy.get_include(),
-                        ],
-                        language="c++",
-                        extra_compile_args=[
-                            "-std=c++17",
-                        ],
-                        extra_link_args=["-lz"],
-                    )
-                ],
-                compiler_directives={"language_level": "3"},
-            ),
-        )
+            ext_modules=[
+                Extension(
+                    "rds2py.core",
+                    ["src/rds2py/lib/rds_parser.cpp", "src/rds2py/lib/parser.pyx"],
+                    include_dirs=[
+                        "extern/rds2cpp/include",
+                        "extern/rds2cpp/_deps/byteme-src/include",
+                        numpy.get_include(),
+                    ],
+                    language="c++",
+                    extra_compile_args=[
+                        "-std=c++17",
+                    ],
+                    extra_link_args=["-lz"],
+                )
+            ],
+        ),
     except:  # noqa
         print(
             "\n\nAn error occurred while building the project, "

src/rds2py/_cpphelpers.py

@@ -0,0 +1,42 @@
+# DO NOT MODIFY: this is automatically generated by the cpptypes
+
+import os
+import ctypes as ct
+
+
+def _catch_errors(f):
+    def wrapper(*args):
+        errcode = ct.c_int32(0)
+        errmsg = ct.c_char_p(0)
+        output = f(*args, ct.byref(errcode), ct.byref(errmsg))
+        if errcode.value != 0:
+            msg = errmsg.value.decode("ascii")
+            lib.free_error_message(errmsg)
+            raise RuntimeError(msg)
+        return output
+
+    return wrapper
+
+
+# TODO: surely there's a better way than whatever this is.
+dirname = os.path.dirname(os.path.abspath(__file__))
+contents = os.listdir(dirname)
+lib = None
+for x in contents:
+    if x.startswith("_core") and not x.endswith("py"):
+        lib = ct.CDLL(os.path.join(dirname, x))
+        break
+
+if lib is None:
+    raise ImportError("failed to find the _core.* module")
+
+lib.free_error_message.argtypes = [ct.POINTER(ct.c_char_p)]
+
+lib.py_py_parser_extract_robject.restype = ct.c_void_p
+lib.py_py_parser_extract_robject.argtypes = [
+    ct.c_void_p,
+    ct.POINTER(ct.c_int32),
+    ct.POINTER(ct.c_char_p),
+]
+
+lib.py_py_parser_rds_file.restype = ct.c_void_p

src/rds2py/lib/bindings.cpp

@@ -0,0 +1,58 @@
+/* DO NOT MODIFY: this is automatically generated by the cpptypes */
+
+#include <cstring>
+#include <stdexcept>
+#include <cstdint>
+
+#ifdef _WIN32
+#define PYAPI __declspec(dllexport)
+#else
+#define PYAPI
+#endif
+
+static char* copy_error_message(const char* original) {
+    auto n = std::strlen(original);
+    auto copy = new char[n + 1];
+    std::strcpy(copy, original);
+    return copy;
+}
+
+uintptr_t py_parser_extract_robject(uintptr_t);
+
+uintptr_t py_parser_rds_file(std::string);
+
+extern "C" {
+
+PYAPI void free_error_message(char** msg) {
+    delete [] *msg;
+}
+
+PYAPI uintptr_t py_py_parser_extract_robject(uintptr_t ptr, int32_t* errcode, char** errmsg) {
+    uintptr_t output = 0;
+    try {
+        output = py_parser_extract_robject(ptr);
+    } catch(std::exception& e) {
+        *errcode = 1;
+        *errmsg = copy_error_message(e.what());
+    } catch(...) {
+        *errcode = 1;
+        *errmsg = copy_error_message("unknown C++ exception");
+    }
+    return output;
+}
+
+PYAPI uintptr_t py_py_parser_rds_file(std::string file, int32_t* errcode, char** errmsg) {
+    uintptr_t output = 0;
+    try {
+        output = py_parser_rds_file(file);
+    } catch(std::exception& e) {
+        *errcode = 1;
+        *errmsg = copy_error_message(e.what());
+    } catch(...) {
+        *errcode = 1;
+        *errmsg = copy_error_message("unknown C++ exception");
+    }
+    return output;
+}
+
+}