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no more '-w' option + new way to check module existence

This commit is contained in:
Roberto Ierusalimschy 2005-08-25 12:39:16 -03:00
parent 8974b59e40
commit 39cdbce23e
4 changed files with 34 additions and 47 deletions
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33
lauxlib.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lauxlib.c,v 1.147 2005/08/18 16:04:05 roberto Exp roberto $
** $Id: lauxlib.c,v 1.148 2005/08/18 20:36:26 roberto Exp roberto $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
@ -231,22 +231,23 @@ LUALIB_API void luaI_openlib (lua_State *L, const char *libname,
const luaL_reg *l, int nup) {
if (libname) {
/* check whether lib already exists */
luaL_getfield(L, LUA_GLOBALSINDEX, libname);
if (lua_isnil(L, -1)) { /* not found? */
lua_pop(L, 1); /* remove previous result */
lua_newtable(L); /* create it */
if (lua_getmetatable(L, LUA_GLOBALSINDEX))
lua_setmetatable(L, -2); /* share metatable with global table */
/* register it with given name */
lua_pushvalue(L, -1);
luaL_setfield(L, LUA_GLOBALSINDEX, libname);
}
else if (!lua_istable(L, -1))
luaL_error(L, "name conflict for library " LUA_QS, libname);
lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
lua_pushvalue(L, -2);
lua_setfield(L, -2, libname); /* _LOADED[modname] = new table */
lua_pop(L, 1); /* remove _LOADED table */
lua_getfield(L, -1, libname); /* get _LOADED[libname] */
if (!lua_istable(L, -1)) { /* not found? */
lua_pop(L, 1); /* remove previous result */
luaL_getfield(L, LUA_GLOBALSINDEX, libname); /* try global variable */
if (!lua_istable(L, -1)) {
if (!lua_isnil(L, -1))
luaL_error(L, "name conflict for module " LUA_QS, libname);
lua_pop(L, 1);
lua_newtable(L); /* create it */
lua_pushvalue(L, -1); /* register it with given name */
luaL_setfield(L, LUA_GLOBALSINDEX, libname);
}
lua_pushvalue(L, -1);
lua_setfield(L, -3, libname); /* _LOADED[libname] = new table */
}
lua_remove(L, -2); /* remove _LOADED table */
lua_insert(L, -(nup+1)); /* move library table to below upvalues */
}
for (; l->name; l++) {

27
loadlib.c
View File

@ -1,5 +1,5 @@
/*
** $Id: loadlib.c,v 1.38 2005/08/15 14:12:32 roberto Exp roberto $
** $Id: loadlib.c,v 1.39 2005/08/17 19:05:04 roberto Exp roberto $
** Dynamic library loader for Lua
** See Copyright Notice in lua.h
**
@ -508,24 +508,29 @@ static int ll_module (lua_State *L) {
const char *dot;
lua_settop(L, 1);
lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
/* try to find given table */
luaL_getfield(L, LUA_GLOBALSINDEX, modname);
if (lua_isnil(L, -1)) { /* not found? */
lua_getfield(L, 2, modname); /* get _LOADED[modname] */
if (!lua_istable(L, -1)) { /* not found? */
lua_pop(L, 1); /* remove previous result */
lua_newtable(L); /* create it */
/* register it with given name */
luaL_getfield(L, LUA_GLOBALSINDEX, modname); /* try global variable */
if (!lua_istable(L, -1)) {
if (!lua_isnil(L, -1))
return luaL_error(L, "name conflict for module " LUA_QS, modname);
lua_pop(L, 1);
lua_newtable(L); /* create it */
lua_pushvalue(L, -1); /* register it with given name */
luaL_setfield(L, LUA_GLOBALSINDEX, modname);
}
lua_pushvalue(L, -1);
luaL_setfield(L, LUA_GLOBALSINDEX, modname);
lua_setfield(L, 2, modname); /* _LOADED[modname] = new table */
}
else if (!lua_istable(L, -1))
return luaL_error(L, "name conflict for module " LUA_QS, modname);
/* check whether table already has a _NAME field */
lua_getfield(L, -1, "_NAME");
if (!lua_isnil(L, -1)) /* is table an initialized module? */
lua_pop(L, 1);
else { /* no; initialize it */
lua_pop(L, 1);
lua_newtable(L); /* create new metatable */
/* create new metatable */
lua_newtable(L);
lua_pushvalue(L, LUA_GLOBALSINDEX);
lua_setfield(L, -2, "__index"); /* mt.__index = _G */
lua_setmetatable(L, -2);
@ -540,8 +545,6 @@ static int ll_module (lua_State *L) {
lua_pushlstring(L, modname, dot - modname);
lua_setfield(L, -2, "_PACKAGE");
}
lua_pushvalue(L, -1);
lua_setfield(L, 2, modname); /* _LOADED[modname] = new table */
setfenv(L);
return 0;
}

3
lstate.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lstate.c,v 2.31 2005/05/05 15:34:03 roberto Exp roberto $
** $Id: lstate.c,v 2.32 2005/06/03 20:15:58 roberto Exp roberto $
** Global State
** See Copyright Notice in lua.h
*/
@ -72,7 +72,6 @@ static void f_luaopen (lua_State *L, void *ud) {
UNUSED(ud);
stack_init(L, L); /* init stack */
sethvalue(L, gt(L), luaH_new(L, 0, 20)); /* table of globals */
hvalue(gt(L))->metatable = luaH_new(L, 0, 0); /* globals metatable */
sethvalue(L, registry(L), luaH_new(L, 6, 20)); /* registry */
luaS_resize(L, MINSTRTABSIZE); /* initial size of string table */
luaT_init(L);

18
lua.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lua.c,v 1.145 2005/06/03 20:16:16 roberto Exp roberto $
** $Id: lua.c,v 1.146 2005/06/28 13:01:50 roberto Exp roberto $
** Lua stand-alone interpreter
** See Copyright Notice in lua.h
*/
@ -48,7 +48,6 @@ static void print_usage (void) {
" -i enter interactive mode after executing " LUA_QL("script") "\n"
" -l name require library " LUA_QL("name") "\n"
" -v show version information\n"
" -w trap access to undefined globals\n"
" -- stop handling options\n" ,
progname);
}
@ -223,14 +222,6 @@ static void dotty (lua_State *L) {
}
static int checkvar (lua_State *L) {
const char *name = lua_tostring(L, 2);
if (name)
luaL_error(L, "attempt to access undefined variable " LUA_QS, name);
return 0;
}
#define clearinteractive(i) (*i &= 2)
static int handle_argv (lua_State *L, int argc, char **argv, int *interactive) {
@ -268,13 +259,6 @@ static int handle_argv (lua_State *L, int argc, char **argv, int *interactive) {
print_version();
break;
}
case 'w': {
if (lua_getmetatable(L, LUA_GLOBALSINDEX)) {
lua_pushcfunction(L, checkvar);
lua_setfield(L, -2, "__index");
}
break;
}
case 'e': {
const char *chunk = argv[i] + 2;
clearinteractive(interactive);