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// lua.c - Use Lua in Python programs
/* Copyright 2012-2023 Bas Wijnen <wijnen@debian.org> {{{
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* }}} */
#include "module.h"
struct OperatorMap operators[NUM_OPERATORS] = { // {{{
{ "__add__", "__add", "+" },
{ "__sub__", "__sub", "-" },
{ "__mul__", "__mul", "*" },
{ "__truediv__", "__div", "/" },
{ "__mod__", "__mod", "%" },
{ "__pow__", "__pow", "^" },
{ "__floordiv__", "__idiv", "//" },
{ "__and__", "__band", "&" },
{ "__or__", "__bor", "|" },
{ "__xor__", "__bxor", "~" },
{ "__lshift__", "__shl", "<<" },
{ "__rshift__", "__shr", ">>" },
{ "__matmul__", "__concat", ".." },
{ "__eq__", "__eq", "==" },
{ "__lt__", "__lt", "<" },
{ "__le__", "__le", "<=" },
{ "__close__", "__close", NULL },
{ "__neg__", "__unm", NULL },
{ "__invert__", "__bnot", NULL },
{ "__len__", "__len", NULL },
{ "__getitem__", "__index", NULL },
{ "__setitem__", "__newindex", NULL },
//{ "__call__", "__call", NULL },
{ "__repr__", "__totring", NULL }
}; // }}}
// Lua callback for all userdata metamethods. (Method selection is done via operator name stored in upvalue.)
// Userdata metamethods are called when Lua code uses an operator on a Python-owned object.
static int metamethod(lua_State *state) { // {{{
// This function is called from Lua through a metatable.
// Get self pointer.
lua_getfield(state, LUA_REGISTRYINDEX, "self");
Lua *lua = (Lua *)lua_touserdata(state, -1);
lua_pop(state, 1);
// 1 upvalue: python method index.
int method_index = lua_tointeger(state, lua_upvalueindex(1));
fprintf(stderr, "calling method %s\n", operators[method_index].python_name);
PyObject *target = Lua_to_python(lua, 1);
PyObject *method = PyMapping_GetItemString(target, operators[method_index].python_name);
if (!method) {
PyErr_Clear();
lua_pop(state, 1);
return 0;
}
// Create arguments tuple
int nargs = lua_gettop(state);
PyObject *args = PyTuple_New(nargs - 1);
for (int i = 2; i <= nargs; ++i) {
PyObject *arg = Lua_to_python(lua, i); // New reference.
// fill tuple
PyTuple_SET_ITEM(args, i - 2, arg); // Steals reference to arg.
}
// Call function.
PyObject *ret = PyObject_CallObject(method, args);
Lua_push(lua, ret); // Unpack returned sequence?
Py_DECREF(ret);
Py_DECREF(args);
return 1;
} // }}}
static int gc(lua_State *state) { // {{{
lua_getfield(state, LUA_REGISTRYINDEX, "self");
PyObject *lua = (PyObject *)lua_touserdata(state, -1);
lua_pop(state, 1);
// Drop (this reference to) the object.
Py_DECREF(lua);
return 0;
} // }}}
static lua_Integer build_wrapper(Lua *self, char const *code, char const *desc, bool make_ref) { // {{{
if (luaL_loadbuffer(self->state, code, strlen(code), desc ? desc : code) != LUA_OK) {
lua_close(self->state);
PyErr_SetString(PyExc_ValueError, lua_tostring(self->state, -1));
return LUA_NOREF;
}
lua_call(self->state, 0, 1);
if (!make_ref)
return LUA_REFNIL;
return luaL_ref(self->state, LUA_REGISTRYINDEX);
} // }}}
// Create (native) Lua table on Lua stack from items in Python list or dict.
static void push_luatable_dict(Lua *self, PyObject *obj) { // {{{
Py_ssize_t ppos = 0;
PyObject *key;
PyObject *value;
while (PyDict_Next(obj, &ppos, &key, &value)) { // Key and value become borrowed references.
Lua_push(self, key);
Lua_push(self, value);
lua_rawset(self->state, -3); // Pops key and value from the stack.
}
} // }}}
static void push_luatable_list(Lua *self, PyObject *obj) { // {{{
Py_ssize_t size = PySequence_Size(obj);
for (Py_ssize_t i = 0; i < size; ++i) {
PyObject *value = PySequence_GetItem(obj, i); // New reference.
Lua_push(self, value);
Py_DECREF(value);
lua_rawseti(self->state, -2, i + 1);
}
} // }}}
static PyObject *construct_bytes_impl(PyObject * /*self*/, PyObject *args) // {{{
{
// Implementation of python.bytes()
PyObject *arg;
if (!PyArg_ParseTuple(args, "O", &arg))
return NULL;
if (PyObject_IsInstance(arg, (PyObject*)table_type)) {
PyObject *list = table_list_method((Table *)arg, NULL);
return PyBytes_FromObject(list);
}
if (PyUnicode_Check(arg))
return PyUnicode_AsUTF8String(arg);
return PyBytes_FromObject(arg);
}
static PyMethodDef construct_bytes_method = {
"constuct_bytes",
(PyCFunction)construct_bytes_impl,
METH_VARARGS,
"Convert argument to bytes"
}; // }}}
static int call_method(lua_State *state) // {{{
{
lua_getfield(state, LUA_REGISTRYINDEX, "self");
Lua *lua = (Lua *)lua_touserdata(state, -1);
lua_pop(state, 1);
PyObject *target = Lua_to_python(lua, 1);
if (!PyCallable_Check(target)) {
fprintf(stderr, "Called object is not callable: ");
PyObject_Print(target, stderr, 0);
fprintf(stderr, "\n");
lua_settop(state, 0);
return 0;
}
// Create arguments tuple
int nargs = lua_gettop(state);
PyObject *args = PyTuple_New(nargs - 1);
for (int i = 2; i <= nargs; ++i) {
PyObject *arg = Lua_to_python(lua, i); // New reference.
// fill tuple
PyTuple_SET_ITEM(args, i - 2, arg); // Steals reference to arg.
}
// Call function.
PyObject *ret = PyObject_CallObject(target, args);
Py_DECREF(args);
if (ret == NULL)
return 0;
Lua_push(lua, ret); // Unpack returned sequence?
Py_DECREF(ret);
return 1;
} // }}}
// Python class Lua __new__ function.
static PyObject *Lua_new(PyTypeObject *type, PyObject *args, PyObject *keywords) { // {{{
Lua *self = (Lua *)type->tp_alloc(type, 0);
if (!self)
return NULL;
// Create a new lua object.
// This object provides the interface into the lua library.
// It also provides access to all the symbols that lua owns.
// Parse arguments. {{{
bool debug = false;
bool loadlib = false;
bool searchers = false;
bool doloadfile = false;
bool io = false;
bool os = false;
bool python_module = true;
char const *keywordnames[] = {"debug", "loadlib", "searchers", "doloadfile", "io", "os", "python_module", NULL};
if (!PyArg_ParseTupleAndKeywords(args, keywords, "|ppppppp", (char **)keywordnames, &debug, &loadlib, &searchers, &doloadfile, &io, &os, &python_module))
return NULL;
// }}}
// Create new state and store back pointer to self. {{{
self->state = luaL_newstate();
lua_pushlightuserdata(self->state, self);
lua_setfield(self->state, LUA_REGISTRYINDEX, "self");
// }}}
// Open standard libraries. Many of them are closed again below.
luaL_openlibs(self->state);
// Create metatable and store operators (because the API does not define them). {{{
lua_createtable(self->state, 0, NUM_OPERATORS + 1);
for (int i = 0; i < NUM_OPERATORS; ++i) {
// Create metatable for table wrappers.
lua_pushinteger(self->state, i);
lua_pushcclosure(self->state, metamethod, 1);
lua_setfield(self->state, -2, operators[i].lua_name);
// Store binary operators. (Others are stored below this loop.)
if (!operators[i].lua_operator)
continue;
char const *template = "return function(a, b) return a %s b end";
char buffer[strlen(template) + 2];
sprintf(buffer, template, operators[i].lua_operator);
lua_Integer function_id = build_wrapper(self, buffer, NULL, true);
if (function_id == LUA_NOREF)
return NULL;
lua_pushinteger(self->state, function_id);
self->lua_operator[i] = Function_create(self);
}
//Lua_dump_stack(self);
// Unary operators.
lua_Integer index = build_wrapper(self, "return function(a) return -a end", NULL, true);
if (index == LUA_NOREF)
return NULL;
lua_pushinteger(self->state, index);
self->lua_operator[NEG] = Function_create(self);
index = build_wrapper(self, "return function(a) return ~a end", NULL, true);
if (index == LUA_NOREF)
return NULL;
lua_pushinteger(self->state, index);
self->lua_operator[NOT] = Function_create(self);
index = build_wrapper(self, "return function(a) return tostring(a) end", NULL, true);
if (index == LUA_NOREF)
return NULL;
lua_pushinteger(self->state, index);
self->lua_operator[STR] = Function_create(self);
// Skipped: len, getitem, setitem, delitem, because they have API calls which are used.
// Set call metamethod.
lua_pushcclosure(self->state, call_method, 0);
lua_setfield(self->state, -2, "__call");
// Set gc metamethod. This is not passed through to Python, but instead cleans up the PyObject * reference.
lua_pushcclosure(self->state, gc, 0);
lua_setfield(self->state, -2, "__gc");
// Set the metatable in the registry, for use by new userdata objects.
lua_setfield(self->state, LUA_REGISTRYINDEX, "metatable");
// }}}
// Store a copy of some initial values, so they still work if the original value is replaced.
self->table_remove = build_wrapper(self, "return table.remove", "get table.remove", true);
if (self->table_remove == LUA_NOREF)
return NULL;
self->table_concat = build_wrapper(self, "return table.concat", "get table.concat", true);
if (self->table_concat == LUA_NOREF)
return NULL;
self->table_insert = build_wrapper(self, "return table.insert", "get table.insert", true);
if (self->table_insert == LUA_NOREF)
return NULL;
self->table_unpack = build_wrapper(self, "return table.unpack", "get table.unpack", true);
if (self->table_unpack == LUA_NOREF)
return NULL;
self->table_move = build_wrapper(self, "return table.move", "get table.move", true);
if (self->table_move == LUA_NOREF)
return NULL;
self->table_sort = build_wrapper(self, "return table.sort", "get table.sort", true);
if (self->table_sort == LUA_NOREF)
return NULL;
self->package_loaded = build_wrapper(self, "return package.loaded", "get package.loaded", true);
if (self->package_loaded == LUA_NOREF)
return NULL;
// Disable optional features that have not been requested. {{{
if (!debug) {
if (build_wrapper(self, "debug = nil package.loaded.debug = nil", "disabling debug", false) == LUA_NOREF)
return NULL;
}
if (!loadlib) {
if (build_wrapper(self, "package.loadlib = nil", "disabling loadlib", false) == LUA_NOREF)
return NULL;
}
if (!searchers) {
if (build_wrapper(self, "package.searchers = {}", "disabling searchers", false) == LUA_NOREF)
return NULL;
}
if (!doloadfile) {
if (build_wrapper(self, "loadfile = nil dofile = nil", "disabling loadfile and dofile", false) == LUA_NOREF)
return NULL;
}
if (!os) {
if (build_wrapper(self, "os = {clock = os.clock, date = os.date, difftime = os.difftime, setlocale = os.setlocale, time = os.time} package.loaded.os = os", "disabling some of os", false) == LUA_NOREF)
return NULL;
}
if (!io) {
if (build_wrapper(self, "io = nil package.loaded.io = nil", "disabling io", false) == LUA_NOREF)
return NULL;
}
// }}}
/* Add access to Python object constructors from Lua (unless disabled).
TODO when Table interface has been implemented.*/
if (python_module) {
// Lua module for accessing some Python parts from Lua. This is prepared as a "python" module unless disabled. {{{
PyObject *table_list = PyCMethod_New(&Table_methods[0],
NULL, NULL, NULL);
PyObject *table_dict = PyCMethod_New(&Table_methods[1],
NULL, NULL, NULL);
PyObject *construct_bytes
= PyCMethod_New(&construct_bytes_method,
NULL, NULL, NULL);
lua_load_module(self, "python", Py_BuildValue("{sO sO sO}",
"list", table_list,
"dict", table_dict,
"bytes", construct_bytes));
// }}}
}
return (PyObject *)self;
} // }}}
// Destructor.
static void Lua_dealloc(Lua *self) { // {{{
lua_close(self->state);
Lua_type->tp_free((PyObject *)self);
} // }}}
// set variable in Lua.
static void set(Lua *self, char const *name, PyObject *value) { // {{{
lua_rawgeti(self->state, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS);
Lua_push(self, value);
lua_setfield(self->state, -2, name);
lua_settop(self->state, -2);
} // }}}
static PyObject *return_stack(Lua *self, int pos, bool keep_single) { // {{{
int size = lua_gettop(self->state) - pos;
PyObject *ret;
if (keep_single || size > 1) {
ret = PyTuple_New(size);
if (ret == NULL)
return NULL;
for (int i = 0; i < size; ++i)
PyTuple_SET_ITEM(ret, i, Lua_to_python(self, -size + i));
lua_settop(self->state, pos);
return ret;
} else if (size == 1) {
ret = Lua_to_python(self, -1);
lua_settop(self->state, pos);
return ret;
} else {
lua_settop(self->state, pos);
Py_RETURN_NONE;
}
} // }}}
// run code after having loaded the buffer (internal use only).
static PyObject *run_code(Lua *self, int pos, bool keep_single) { // {{{
lua_call(self->state, 0, LUA_MULTRET);
if (PyErr_Occurred()) {
lua_settop(self->state, 0);
return NULL;
}
return return_stack(self, pos, keep_single);
} // }}}
// run string in lua.
static PyObject *run(Lua *self, char const *cmd, char const *description, bool keep_single) { // {{{
int pos = lua_gettop(self->state);
if (luaL_loadbuffer(self->state, cmd, strlen(cmd), description) != LUA_OK) {
PyErr_SetString(PyExc_ValueError, lua_tostring(self->state, -1));
return NULL;
}
return run_code(self, pos, keep_single);
} // }}}
// run file in lua.
static PyObject *do_run_file(Lua *self, char const *filename, bool keep_single) { // {{{
int pos = lua_gettop(self->state);
if (luaL_loadfilex(self->state, filename, NULL) != LUA_OK) {
PyErr_SetString(PyExc_ValueError, lua_tostring(self->state, -1));
return NULL;
}
return run_code(self, pos, keep_single);
} // }}}
// load module into lua.
void lua_load_module(Lua *self, char const *name, PyObject *dict) { // {{{
if (!PyDict_Check(dict)) {
PyObject *new_dict = PyDict_New(); // new reference
PyObject *dir = PyObject_Dir(dict); // new reference
Py_ssize_t size = PyList_Size(dir);
for (Py_ssize_t i = 0; i < size; ++i) {
PyObject *key = PyList_GetItem(dir, i); // borrowed reference
Py_ssize_t len;
char const *byteskey = PyUnicode_AsUTF8AndSize(key, &len);
if (len > 0 && byteskey[0] == '_') {
if (strncmp(byteskey, "_lua_", 5) != 0)
continue;
byteskey = &byteskey[4];
len -= 4;
}
PyObject *value = PyObject_GetAttr(dict, key); // new reference
PyDict_SetItemString(new_dict, byteskey, value); // no stealing
Py_DECREF(value);
}
Py_DECREF(dir);
Py_DECREF(dict);
dict = new_dict;
}
lua_geti(self->state, LUA_REGISTRYINDEX, self->package_loaded);
lua_createtable(self->state, 0, PyDict_Size(dict)); // Pushes new table on the stack.
push_luatable_dict(self, dict); // Fills it with contents.
lua_setfield(self->state, -2, name);
lua_settop(self->state, -2);
} // }}}
// load variable from lua stack into python.
PyObject *Lua_to_python(Lua *self, int index) { // {{{
int type = lua_type(self->state, index);
switch(type) {
case LUA_TNIL:
Py_RETURN_NONE;
case LUA_TBOOLEAN:
return PyBool_FromLong(lua_toboolean(self->state, index));
//case LUA_TLIGHTUSERDATA: // Not used.
// return lua_touserdata(self->state, index)
case LUA_TNUMBER:
{
// If this is exactly an integer, return it as an integer.
lua_Integer iret = lua_tointeger(self->state, index);
lua_Number ret = lua_tonumber(self->state, index);
if ((lua_Number)iret == ret)
return PyLong_FromLongLong(iret);
return PyFloat_FromDouble(ret);
}
case LUA_TSTRING:
{
size_t len;
char const *str = lua_tolstring(self->state, index, &len);
return PyUnicode_DecodeUTF8(str, len, NULL);
}
case LUA_TTABLE:
lua_pushvalue(self->state, index);
return Table_create(self);
case LUA_TFUNCTION:
lua_pushvalue(self->state, index);
return Function_create(self);
case LUA_TUSERDATA:
// This is a Python-owned object that was used by Lua.
// The data block of the userdata stores the PyObject *.
return *(PyObject **)lua_touserdata(self->state, index);
//case LUA_TTHREAD: // Not used.
// return lua_tothread(self->state, index)
default:
//if (lua_iscfunction(self->state, index)) {
// return lua_tocfunction(self->state, index)
//}
return PyErr_Format(PyExc_ValueError, "Invalid type %x passed to Lua_to_python", type);
}
} // }}}
// load variable from python onto lua stack.
void Lua_push(Lua *self, PyObject *obj) { // {{{
if (obj == Py_None)
lua_pushnil(self->state);
else if (PyBool_Check(obj))
lua_pushboolean(self->state, obj == Py_True);
else if (PyLong_Check(obj))
lua_pushinteger(self->state, PyLong_AsLongLong(obj));
else if (PyUnicode_Check(obj)) {
// A str is encoded as bytes in Lua; bytes is wrapped as an object.
Py_ssize_t len;
char const *str = PyUnicode_AsUTF8AndSize(obj, &len);
lua_pushlstring(self->state, str, len);
}
else if (PyFloat_Check(obj))
lua_pushnumber(self->state, PyFloat_AsDouble(obj));
else if (PyObject_TypeCheck(obj, table_type))
lua_rawgeti(self->state, LUA_REGISTRYINDEX, ((Table *)obj)->id);
else if (PyObject_TypeCheck(obj, function_type))
lua_rawgeti(self->state, LUA_REGISTRYINDEX, ((Function *)obj)->id);
else {
*(PyObject **)lua_newuserdatauv(self->state, sizeof(PyObject *), 0) = obj;
Py_INCREF(obj);
// FIXME: use gc metamethod to DECREF the object.
lua_getfield(self->state, LUA_REGISTRYINDEX, "metatable");
lua_setmetatable(self->state, -2);
}
} // }}}
// Type definition. {{{
// Python-accessible methods. {{{
static PyObject *Lua_set(Lua *self, PyObject *args) { // {{{
char const *name;
PyObject *value;
if (!PyArg_ParseTuple(args, "sO", &name, &value))
return NULL;
set(self, name, value);
Py_RETURN_NONE;
} // }}}
static PyObject *Lua_run(Lua *self, PyObject *args, PyObject *keywords) { // {{{
char const *code;
char const *description = NULL;
bool keep_single = false;
char const *var = NULL;
PyObject *value = NULL;
char const *keywordnames[] = {"code", "description", "var", "value", "keep_single", NULL};
if (!PyArg_ParseTupleAndKeywords(args, keywords, "s|ssOp", (char **)keywordnames, &code, &description, &var, &value, &keep_single))
return NULL;
if (!description)
description = code;
if (var || value) {
if (!var || !value) {
PyErr_SetString(PyExc_ValueError, "var and value must both be present, or both be missing");
return NULL;
}
set(self, var, value);
}
return run(self, code, description, keep_single);
} // }}}
static PyObject *Lua_run_file(Lua *self, PyObject *args, PyObject *keywords) { // {{{
char const *filename;
bool keep_single = false;
char const *var = NULL;
PyObject *value = NULL;
char const *keywordnames[] = {"filename", "keep_single", "var", "value", NULL};
if (!PyArg_ParseTupleAndKeywords(args, keywords, "s|sOp", (char **)keywordnames, &filename, &var, &value, &keep_single))
return NULL;
if (var)
set(self, var, value);
return do_run_file(self, filename, keep_single);
} // }}}
static PyObject *Lua_module(Lua *self, PyObject *args) { // {{{
char const *name;
PyObject *dict;
if (!PyArg_ParseTuple(args, "sO", &name, &dict))
return NULL;
lua_load_module(self, name, dict);
Py_RETURN_NONE;
} // }}}
static PyObject *Lua_table(Lua *self, PyObject *args, PyObject *kwargs) { // {{{
int pos = lua_gettop(self->state);
size_t kw_size = kwargs == NULL ? 0 : PyDict_Size(kwargs);
lua_createtable(self->state, PySequence_Size(args), kw_size); // Pushes new table on the stack.
push_luatable_list(self, args);
if (kwargs != NULL)
push_luatable_dict(self, kwargs);
return return_stack(self, pos, false);
} // }}}
// }}}
// }}}
void Lua_dump_stack(Lua *self) { // {{{
int n = lua_gettop(self->state);
fprintf(stderr, "***** Lua stack dump *****\n");
for (int i = 1; i <= n; ++i) {
fprintf(stderr, "%d\t", i);
PyObject *value = Lua_to_python(self, i);
PyObject_Print(value, stderr, 0);
Py_DECREF(value);
fprintf(stderr, "\n");
}
fprintf(stderr, "**************************\n");
} // }}}
// Module registration.
PyMODINIT_FUNC PyInit_lua() { // {{{
static PyModuleDef Module = { // {{{
PyModuleDef_HEAD_INIT,
.m_name = "lua",
.m_doc = PyDoc_STR("Use Lua code and object from Python and vice versa."),
.m_size = 0, // There is no module state.
.m_methods = NULL, // There are no functions.
.m_slots = NULL, // This must be NULL for PyModule_Create()
.m_traverse = NULL,
.m_clear = NULL,
.m_free = NULL,
}; // }}}
static PyMethodDef Lua_methods[] = { // {{{
{"set", (PyCFunction)Lua_set, METH_VARARGS, "Set a variable"},
{"run", (PyCFunction)Lua_run, METH_VARARGS | METH_KEYWORDS, "Run a Lua script"},
{"run_file", (PyCFunction)Lua_run_file, METH_VARARGS | METH_KEYWORDS, "Run a Lua script from a file"},
{"module", (PyCFunction)Lua_module, METH_VARARGS, "Import a module into Lua"},
{"table", (PyCFunction)Lua_table, METH_VARARGS | METH_KEYWORDS, "Create a Lua Table"},
{NULL, NULL, 0, NULL}
}; // }}}
static PyType_Slot lua_slots[] = { // {{{
{ Py_tp_new, Lua_new },
{ Py_tp_dealloc, Lua_dealloc },
{ Py_tp_doc, "Hold Lua object state" },
{ Py_tp_methods, Lua_methods },
{ 0, NULL },
}; // }}}
static PyType_Spec *LuaType; // {{{
LuaType = malloc(sizeof(*LuaType));
memset(LuaType, 0, sizeof(*LuaType));
LuaType->name = "lua.Lua";
LuaType->basicsize = sizeof(Lua);
LuaType->itemsize = 0;
LuaType->flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HEAPTYPE;
LuaType->slots = lua_slots;
// }}}
static PyType_Slot function_slots[] = { // {{{
//{ Py_tp_new, NULL },
{ Py_tp_dealloc, Function_dealloc },
{ Py_tp_doc, "Access a Lua-owned function from Python" },
{ Py_tp_call, Function_call },
{ Py_tp_repr, Function_repr },
{ 0, NULL },
}; // }}}
static PyType_Spec *FunctionType; // {{{
FunctionType = malloc(sizeof(*FunctionType));
memset(FunctionType, 0, sizeof(*FunctionType));
FunctionType->name = "lua.Function";
FunctionType->basicsize = sizeof(Function);
FunctionType->itemsize = 0;
FunctionType->flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HEAPTYPE;
FunctionType->slots = function_slots;
// }}}
static PyType_Slot table_slots[] = { // {{{
{ Py_tp_dealloc, Table_dealloc },
{ Py_tp_doc, "Access a Lua-owned table from Python" },
{ Py_tp_repr, Table_repr },
{ Py_tp_str, Table_repr },
{ Py_mp_length, Table_len },
{ Py_mp_subscript, Table_getitem },
{ Py_mp_ass_subscript, Table_setitem },
{ Py_tp_methods, Table_methods },
{ 0, NULL },
}; // }}}
static PyType_Spec *TableType; // {{{
TableType = malloc(sizeof(*TableType));
memset(TableType, 0, sizeof(*TableType));
TableType->name = "lua.Table";
TableType->basicsize = sizeof(Table);
TableType->itemsize = 0;
TableType->flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HEAPTYPE;
TableType->slots = table_slots;
// }}}
static PyType_Slot table_iter_slots[] = { // {{{
{ Py_tp_dealloc, Table_iter_dealloc },
{ Py_tp_doc, "iterator for lua.table" },
{ Py_tp_repr, Table_iter_repr },
{ Py_tp_str, Table_iter_repr },
{ Py_tp_iter, Table_iter_iter },
{ Py_tp_iternext, Table_iter_iternext },
{ 0, NULL },
}; // }}}
static PyType_Spec *TableIterType; // {{{
TableIterType = malloc(sizeof(*TableIterType));
memset(TableIterType, 0, sizeof(*TableIterType));
TableIterType->name = "lua.Table.iterator";
TableIterType->basicsize = sizeof(TableIter);
TableIterType->itemsize = 0;
TableIterType->flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HEAPTYPE;
TableIterType->slots = table_iter_slots;
// }}}
//fprintf(stderr, "creating module.\n");
PyObject *m = PyModule_Create(&Module);
if (!m)
return NULL;
//fprintf(stderr, "creating type lua.\n");
Lua_type = (PyTypeObject *)PyType_FromModuleAndSpec(m, LuaType, NULL);
if (!Lua_type || PyModule_AddObject(m, "Lua", (PyObject *)Lua_type) < 0) {
Py_DECREF(m);
return NULL;
}
Py_INCREF(Lua_type);
//fprintf(stderr, "creating type function.\n");
function_type = (PyTypeObject *)PyType_FromModuleAndSpec(m, FunctionType, NULL);
if (!function_type || PyModule_AddObject(m, "Function", (PyObject *)function_type) < 0) {
Py_DECREF(Lua_type);
Py_DECREF(m);
return NULL;
}
Py_INCREF(function_type);
//fprintf(stderr, "creating type table.\n");
table_type = (PyTypeObject *)PyType_FromModuleAndSpec(m, TableType, NULL);
if (!table_type || PyModule_AddObject(m, "Table", (PyObject *)table_type) < 0) {
Py_DECREF(Lua_type);
Py_DECREF(function_type);
Py_DECREF(m);
return NULL;
}
Py_INCREF(table_type);
//fprintf(stderr, "creating type table_iter.\n");
table_iter_type = (PyTypeObject *)PyType_FromModuleAndSpec(m, TableIterType, NULL);
if (!table_iter_type || PyModule_AddObject(m, "TableIter", (PyObject *)table_iter_type) < 0) {
Py_DECREF(Lua_type);
Py_DECREF(function_type);
Py_DECREF(table_type);
Py_DECREF(m);
return NULL;
}
Py_INCREF(table_iter_type);
//fprintf(stderr, "done.\n");
return m;
} // }}}
PyTypeObject *Lua_type;
// vim: set foldmethod=marker :
|