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#! /usr/bin/env python
import sys
import pybindgen
from pybindgen import ReturnValue, Parameter, Module, Function, FileCodeSink
from pybindgen import CppMethod, CppConstructor, CppClass, Enum
from pybindgen.typehandlers.base import ForwardWrapperBase
class VisitorParam(Parameter):
DIRECTIONS = [Parameter.DIRECTION_IN]
CTYPES = ['Visitor']
def convert_python_to_c(self, wrapper):
assert isinstance(wrapper, ForwardWrapperBase)
py_cb = wrapper.declarations.declare_variable("PyObject*", self.name)
wrapper.parse_params.add_parameter('O', ['&'+py_cb], self.name)
wrapper.before_call.write_error_check("!PyCallable_Check(%s)" % py_cb,
"""PyErr_SetString(PyExc_TypeError, "visitor parameter must be callable");""")
wrapper.call_params.append("_wrap_Visit")
wrapper.before_call.write_code("Py_INCREF(%s);" % py_cb)
wrapper.before_call.add_cleanup_code("Py_DECREF(%s);" % py_cb)
wrapper.call_params.append(py_cb)
def convert_c_to_python(self, wrapper):
raise NotImplementedError
def my_module_gen(out_file):
mod = Module('c')
mod.add_include('"c.h"')
mod.header.writeln("""void _wrap_Visit(int value, void *data);""")
mod.body.writeln("""
void _wrap_Visit(int value, void *data)
{
PyObject *callback = (PyObject*) data;
PyObject_CallFunction(callback, (char*) "i", value);
}
""")
mod.add_function("visit", None, [Parameter.new("Visitor", "visitor")]
# the 'data' parameter is inserted automatically
# by the custom callback type handler
)
mod.generate(FileCodeSink(out_file))
if __name__ == '__main__':
my_module_gen(sys.stdout)
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