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/* $%BEGINLICENSE%$
Copyright (C) 2008 MySQL AB, 2008 Sun Microsystems, Inc
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
$%ENDLICENSE%$ */
#include <lua.h>
#include "lua-env.h"
#include "glib-ext.h"
#define C(x) x, sizeof(x) - 1
#define S(x) x->str, x->len
#include "sql-tokenizer.h"
static int proxy_tokenize_token_get(lua_State *L) {
sql_token *token = *(sql_token **)luaL_checkself(L);
size_t keysize;
const char *key = luaL_checklstring(L, 2, &keysize);
if (strleq(key, keysize, C("text"))) {
lua_pushlstring(L, S(token->text));
return 1;
} else if (strleq(key, keysize, C("token_id"))) {
lua_pushinteger(L, token->token_id);
return 1;
} else if (strleq(key, keysize, C("token_name"))) {
lua_pushstring(L, sql_token_get_name(token->token_id));
return 1;
} else {
luaL_error(L, "tokens[...] has no %s field", key);
}
return 0;
}
int sql_tokenizer_lua_token_getmetatable(lua_State *L) {
static const struct luaL_reg methods[] = {
{ "__index", proxy_tokenize_token_get },
{ NULL, NULL },
};
return proxy_getmetatable(L, methods);
}
static int proxy_tokenize_get(lua_State *L) {
GPtrArray *tokens = *(GPtrArray **)luaL_checkself(L);
int ndx = luaL_checkinteger(L, 2);
sql_token *token;
sql_token **token_p;
if (tokens->len > G_MAXINT) {
return 0;
}
/* lua uses 1 is starting index */
if (ndx < 1 || ndx > (int)tokens->len) {
return 0;
}
token = tokens->pdata[ndx - 1];
token_p = lua_newuserdata(L, sizeof(token)); /* (sp += 1) */
*token_p = token;
sql_tokenizer_lua_token_getmetatable(L);
lua_setmetatable(L, -2); /* tie the metatable to the udata (sp -= 1) */
return 1;
}
static int proxy_tokenize_len(lua_State *L) {
GPtrArray *tokens = *(GPtrArray **)luaL_checkself(L);
lua_pushinteger(L, tokens->len);
return 1;
}
static int proxy_tokenize_gc(lua_State *L) {
GPtrArray *tokens = *(GPtrArray **)luaL_checkself(L);
sql_tokens_free(tokens);
return 0;
}
static int sql_tokenizer_lua_getmetatable(lua_State *L) {
static const struct luaL_reg methods[] = {
{ "__index", proxy_tokenize_get },
{ "__len", proxy_tokenize_len },
{ "__gc", proxy_tokenize_gc },
{ NULL, NULL },
};
return proxy_getmetatable(L, methods);
}
/**
* split the SQL query into a stream of tokens
*/
int proxy_tokenize(lua_State *L) {
size_t str_len;
const char *str = luaL_checklstring(L, 1, &str_len);
GPtrArray *tokens = sql_tokens_new();
GPtrArray **tokens_p;
sql_tokenizer(tokens, str, str_len);
tokens_p = lua_newuserdata(L, sizeof(tokens)); /* (sp += 1) */
*tokens_p = tokens;
sql_tokenizer_lua_getmetatable(L);
lua_setmetatable(L, -2); /* tie the metatable to the udata (sp -= 1) */
return 1;
}
/*
** Assumes the table is on top of the stack.
*/
static void set_info (lua_State *L) {
lua_pushliteral (L, "_COPYRIGHT");
lua_pushliteral (L, "Copyright (C) 2008 MySQL AB, 2008 Sun Microsystems, Inc");
lua_settable (L, -3);
lua_pushliteral (L, "_DESCRIPTION");
lua_pushliteral (L, "a simple tokenizer for mysql.*");
lua_settable (L, -3);
lua_pushliteral (L, "_VERSION");
lua_pushliteral (L, "LuaMySQLTokenizer 0.1");
lua_settable (L, -3);
}
static const struct luaL_reg mysql_tokenizerlib[] = {
{"tokenize", proxy_tokenize},
{NULL, NULL},
};
#if defined(_WIN32)
# define LUAEXT_API __declspec(dllexport)
#else
# define LUAEXT_API extern
#endif
LUAEXT_API int luaopen_mysql_tokenizer (lua_State *L) {
luaL_register (L, "tokenizer", mysql_tokenizerlib);
set_info (L);
return 1;
}
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