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