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/*
See license.txt in the root of this project.
*/
# include "luametatex.h"
# include "lmtoptional.h"
typedef struct sqlite3_instance sqlite3_instance;
# define SQLITELIB_METATABLE "luatex.sqlitelib"
typedef struct sqlitelib_data {
/*tex There is not much more than a pointer currently. */
sqlite3_instance *db;
} sqlitelib_data ;
typedef struct sqlitelib_state_info {
int initialized;
int padding;
int (*sqlite3_initialize) (
void
);
int (*sqlite3_open) (
const char *filename,
sqlite3_instance **ppDb
);
int (*sqlite3_close) (
sqlite3_instance *
);
int (*sqlite3_exec) (
sqlite3_instance *,
const char *sql,
int (*callback)(void*, int, char**, char**),
void *,
char **errmsg
);
const char * (*sqlite3_errmsg) (
sqlite3_instance *
);
} sqlitelib_state_info;
static sqlitelib_state_info sqlitelib_state = {
.initialized = 0,
.padding = 0,
.sqlite3_initialize = NULL,
.sqlite3_open = NULL,
.sqlite3_close = NULL,
.sqlite3_exec = NULL,
.sqlite3_errmsg = NULL,
};
static int sqlitelib_initialize(lua_State * L)
{
if (! sqlitelib_state.initialized) {
const char *filename = lua_tostring(L, 1);
if (filename) {
lmt_library lib = lmt_library_load(filename);
sqlitelib_state.sqlite3_initialize = lmt_library_find(lib, "sqlite3_initialize");
sqlitelib_state.sqlite3_open = lmt_library_find(lib, "sqlite3_open");
sqlitelib_state.sqlite3_close = lmt_library_find(lib, "sqlite3_close");
sqlitelib_state.sqlite3_exec = lmt_library_find(lib, "sqlite3_exec");
sqlitelib_state.sqlite3_errmsg = lmt_library_find(lib, "sqlite3_errmsg");
sqlitelib_state.initialized = lmt_library_okay(lib);
}
if (sqlitelib_state.initialized) {
sqlitelib_state.sqlite3_initialize();
}
}
lua_pushboolean(L, sqlitelib_state.initialized);
return 1;
}
static int sqlitelib_open(lua_State * L)
{
if (sqlitelib_state.initialized) {
const char *filename = lua_tostring(L, 1);
if (filename != NULL) {
sqlitelib_data *data = lua_newuserdatauv(L, sizeof(data), 0);
if (! sqlitelib_state.sqlite3_open(filename, &(data->db))) {
luaL_getmetatable(L, SQLITELIB_METATABLE);
lua_setmetatable(L, -2);
return 1;
}
}
}
return 0;
}
static int sqlitelib_close(lua_State * L)
{
if (sqlitelib_state.initialized) {
sqlitelib_data * data = luaL_checkudata(L, 1, SQLITELIB_METATABLE);
if (data != NULL) {
sqlitelib_state.sqlite3_close(data->db);
data->db = NULL;
}
}
return 0;
}
/* we could save the fields in the registry */
static int rows_done = 0; /* can go on stack */
static int sqlitelib_callback(void * L, int nofcolumns, char **values, char **fields)
{
lua_pushvalue(L, -1);
lua_pushinteger(L, nofcolumns);
if (nofcolumns > 0 && values != NULL) {
lua_createtable(L, nofcolumns, 0);
for (int i = 0; i < nofcolumns; i++) {
lua_pushstring(L, values[i]);
lua_rawseti(L, -2, (lua_Integer)i + 1);
}
if (! rows_done && fields != NULL) {
lua_createtable(L, nofcolumns, 0);
for (int i = 0; i < nofcolumns; i++) {
lua_pushstring(L, fields[i]);
lua_rawseti(L, -2, (lua_Integer)i + 1);
}
lua_call(L, 3, 0);
} else {
lua_call(L, 2, 0);
}
} else {
lua_call(L, 1, 0);
}
++rows_done;
return 0;
}
/* execute(database,querystring,callback) : callback(nofcolumns,values,fields) */
static int sqlitelib_execute(lua_State * L)
{
if (sqlitelib_state.initialized && ! rows_done) {
sqlitelib_data * data = luaL_checkudata(L, 1, SQLITELIB_METATABLE);
if (data != NULL) {
const char *query = lua_tostring(L, 2);
if (query != NULL) {
int result = 0;
rows_done = 0;
if (lua_isfunction(L, 3)) {
result = sqlitelib_state.sqlite3_exec(data->db, query, &sqlitelib_callback, L, NULL);
} else {
result = sqlitelib_state.sqlite3_exec(data->db, query, NULL, NULL, NULL);
}
rows_done = 0;
lua_pushboolean(L, ! result);
return 1;
}
}
}
lua_pushboolean(L, 0);
return 1;
}
static int sqlitelib_getmessage(lua_State * L)
{
if (sqlitelib_state.initialized) {
sqlitelib_data * data = luaL_checkudata(L, 1, SQLITELIB_METATABLE);
if (data != NULL) {
lua_pushstring(L, sqlitelib_state.sqlite3_errmsg(data->db));
return 1;
}
}
return 0;
}
/* private */
static int sqlitelib_free(lua_State * L)
{
return sqlitelib_close(L);
}
/* <string> = tostring(instance) */
static int sqlitelib_tostring(lua_State * L)
{
if (sqlitelib_state.initialized) {
sqlitelib_data * data = luaL_checkudata(L, 1, SQLITELIB_METATABLE);
if (data != NULL) {
(void) lua_pushfstring(L, "<sqlitelib-instance %p>", data);
} else {
lua_pushnil(L);
}
return 1;
} else {
return 0;
}
}
static const struct luaL_Reg sqlitelib_metatable[] = {
{ "__tostring", sqlitelib_tostring },
{ "__gc", sqlitelib_free },
{ NULL, NULL },
};
static struct luaL_Reg sqlitelib_function_list[] = {
{ "initialize", sqlitelib_initialize },
{ "open", sqlitelib_open },
{ "close", sqlitelib_close },
{ "execute", sqlitelib_execute },
{ "getmessage", sqlitelib_getmessage },
{ NULL, NULL },
};
int luaopen_sqlite(lua_State * L)
{
luaL_newmetatable(L, SQLITELIB_METATABLE);
luaL_setfuncs(L, sqlitelib_metatable, 0);
lmt_library_register(L, "sqlite", sqlitelib_function_list);
return 0;
}
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