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Beginnings of a Python extension.

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pull/13171/head
Joshua Haberman 16 years ago
parent cfd67dda49
commit f00091f340
3 changed files with 298 additions and 0 deletions
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  1. 253
      lang_ext/python/definition.c
  2. 34
      lang_ext/python/definition.h
  3. 11
      lang_ext/python/setup.py

253
lang_ext/python/definition.c
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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2009 Joshua Haberman. See LICENSE for details.
*
* This file defines the Python module upb.definition. This module
* defines the following Python classes, which wrap upb's internal
* definitions:
*
* - upb.definition.MessageDefintion
* - upb.definition.EnumDefinition (TODO)
* - upb.definition.ServiceDefinition (TODO)
*
* We also define a class upb.definition.Context, which provides the
* mechanism for loading the above definitions from .proto files or
* from binary descriptors.
*
* Once these definitions are loaded, we can use them to create
* the Python types for each .proto message type. That is covered
* in other files.
*/
#include "definition.h"
#include "upb_context.h"
#if PY_MAJOR_VERSION > 3
const char *bytes_format = "y#";
#else
const char *bytes_format = "s#";
#endif
/* upb.def.MessageDefinition **************************************************/
#if 0
/* Not implemented yet, but these methods will expose information about the
* message definition (the upb_msgdef). */
static PyMethodDef PyUpb_MessageDefinitionMethods[] = {
};
PyTypeObject PyUpb_MessageDefinitionType = {
PyObject_HEAD_INIT(NULL)
0, /* ob_size */
"upb.definition.MessageDefinition", /* tp_name */
sizeof(PyUpb_MessageDefinition), /* tp_basicsize */
0, /* tp_itemsize */
msgdef_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
msgdef_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
0, /* Can't be created in Python. */ /* tp_new */
0, /* tp_free */
};
#endif
/* upb.Context ****************************************************************/
typedef struct {
PyObject_HEAD
struct upb_context *context;
} PyUpb_Context;
static PyTypeObject PyUpb_ContextType; /* forward decl. */
#define CheckContext(obj) \
(void*)obj; do { \
if(!PyObject_TypeCheck(obj, &PyUpb_ContextType)) { \
PyErr_SetString(PyExc_TypeError, "Must be a upb.Context"); \
return NULL; \
} \
} while(0)
static PyObject *context_parsefds(PyObject *_context, PyObject *args)
{
PyUpb_Context *context = CheckContext(_context);
struct upb_string str;
if(!PyArg_ParseTuple(args, bytes_format, &str.ptr, &str.byte_len))
return NULL;
str.byte_size = 0; /* We don't own that mem. */
if(!upb_context_parsefds(context->context, &str)) {
/* TODO: an appropriate error. */
PyErr_SetString(PyExc_TypeError, "Failed to parse."); \
return NULL; \
}
Py_RETURN_NONE;
}
//static PyObject *context_lookup(PyObject *self, PyObject *args)
//{
// PyUpb_Context *context = CheckContext(self);
// struct upb_string str;
// if(!PyArg_ParseTuple(args, "s#", &str.ptr, &str.byte_len))
// return NULL;
// str.byte_size = 0; /* We don't own that mem. */
//
// struct upb_symtab_entry e;
// if(upb_context_lookup(context->context, &str, &e)) {
// return get_or_create_def(&e);
// } else {
// Py_RETURN_NONE;
// }
//}
//
//static PyObject *context_resolve(PyObject *self, PyObject *args)
//{
// PyUpb_Context *context = CheckContext(self);
// struct upb_string str;
// if(!PyArg_ParseTuple(args, "s#", &str.ptr, &str.byte_len))
// return NULL;
// str.byte_size = 0; /* We don't own that mem. */
//
// struct upb_symtab_entry e;
// if(upb_context_resolve(context->context, &str, &e)) {
// return get_or_create_def(&e);
// } else {
// Py_RETURN_NONE;
// }
//}
static void add_string(void *udata, struct upb_symtab_entry *entry)
{
PyObject *list = udata;
struct upb_string *s = &entry->e.key;
/* TODO: check return. */
PyObject *str = PyString_FromStringAndSize(s->ptr, s->byte_len);
PyList_Append(list, str);
}
static PyObject *context_symbols(PyObject *self, PyObject *args)
{
PyUpb_Context *context = CheckContext(self);
PyObject *list = PyList_New(0); /* TODO: check return. */
upb_context_enumerate(context->context, add_string, list);
return list;
}
static PyMethodDef context_methods[] = {
{"parse_file_descriptor_set", context_parsefds, METH_VARARGS,
"Parses a string containing a serialized FileDescriptorSet and adds its "
"definitions to the context."
},
//{"lookup", context_lookup, METH_VARARGS,
// "Finds a symbol by fully-qualified name (eg. foo.bar.MyType)."
//},
//{"resolve", context_resolve, METH_VARARGS,
// "Finds a symbol by a possibly-relative name, which will be interpreted "
// "in the context of the given base."
//}
{"symbols", context_symbols, METH_NOARGS,
"Returns a list of symbol names that are defined in this context."
},
{NULL, NULL}
};
static PyObject *context_new(PyTypeObject *subtype,
PyObject *args, PyObject *kwds)
{
PyUpb_Context *obj = (void*)subtype->tp_alloc(subtype, 0);
obj->context = upb_context_new();
return (void*)obj;
}
static void context_dealloc(PyObject *obj)
{
PyUpb_Context *c = (void*)obj;
upb_context_unref(c->context);
}
static PyTypeObject PyUpb_ContextType = {
PyObject_HEAD_INIT(NULL)
0, /* ob_size */
"upb.definition.Context", /* tp_name */
sizeof(PyUpb_Context), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)context_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
context_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
context_new, /* tp_new */
0, /* tp_free */
};
PyMethodDef methods[] = {
};
PyMODINIT_FUNC
initdefinition(void)
{
if(PyType_Ready(&PyUpb_ContextType) < 0) return;
Py_INCREF(&PyUpb_ContextType); /* TODO: necessary? */
PyObject *mod = Py_InitModule("upb.definition", methods);
PyModule_AddObject(mod, "Context", (PyObject*)&PyUpb_ContextType);
}

34
lang_ext/python/definition.h
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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2009 Joshua Haberman. See LICENSE for details.
*
* See def.h for a general description. These definitions
* must be shared so that specific Python message types (for the
* different proto APIs) can have access to the C definitions. */
#ifndef UPB_PYTHON_DEFINITION_H_
#define UPB_PYTHON_DEFINITION_H_
#include <Python.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct {
PyObject_HEAD
struct upb_msgdef *def;
} PyUpb_MessageDefinition;
extern PyTypeObject PyUpb_MessageDefinitionType;
/* What format string should be passed to PyArg_ParseTuple to get just a raw
* string of bytes and a length. */
extern const char *bytes_format;
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif

11
lang_ext/python/setup.py
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from distutils.core import setup, Extension
setup(name='upb',
version='0.1',
ext_modules=[Extension('upb.definition', ['definition.c'],
include_dirs=['../../src'],
define_macros=[("UPB_USE_PTHREADS", 1),
("UPB_UNALIGNED_READS_OK", 1)],
library_dirs=['../../src'],
libraries=['upb']
)],
)
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