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tostring' uses __tostring' when available

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This commit is contained in:
Roberto Ierusalimschy
2002-04-02 17:42:20 -03:00
parent e5919be1a7
commit 2cbbf7e95a
1 changed files with 13 additions and 16 deletions
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29
lbaselib.c
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@@ -1,5 +1,5 @@
/*
** $Id: lbaselib.c,v 1.61 2002/03/27 12:49:53 roberto Exp roberto $
** $Id: lbaselib.c,v 1.62 2002/03/27 15:30:41 roberto Exp roberto $
** Basic library
** See Copyright Notice in lua.h
*/
@@ -122,7 +122,9 @@ static int luaB_error (lua_State *L) {
static int luaB_metatable (lua_State *L) {
luaL_check_any(L, 1);
if (lua_isnone(L, 2)) {
if (lua_getmetatable(L, 1)) {
if (!lua_getmetatable(L, 1))
return 0; /* no metatable */
else {
lua_pushliteral(L, "__metatable");
lua_rawget(L, -2);
if (lua_isnil(L, -1))
@@ -361,6 +363,9 @@ static int luaB_call (lua_State *L) {
static int luaB_tostring (lua_State *L) {
char buff[64];
luaL_checkany(L, 1);
if (luaL_callmeta(L, 1, "__tostring")) /* is there a metafield? */
return 1; /* use its value */
switch (lua_type(L, 1)) {
case LUA_TNUMBER:
lua_pushstring(L, lua_tostring(L, 1));
@@ -372,25 +377,17 @@ static int luaB_tostring (lua_State *L) {
lua_pushstring(L, (lua_toboolean(L, 1) ? "true" : "false"));
return 1;
case LUA_TTABLE:
sprintf(buff, "%.40s: %p", lua_typename(L, lua_type(L, 1)),
lua_topointer(L, 1));
sprintf(buff, "table: %p", lua_topointer(L, 1));
break;
case LUA_TFUNCTION:
sprintf(buff, "function: %p", lua_topointer(L, 1));
break;
case LUA_TUSERDATA: {
const char *t = lua_typename(L, lua_type(L, 1));
if (strcmp(t, "userdata") == 0)
sprintf(buff, "userdata: %p", lua_touserdata(L, 1));
else
sprintf(buff, "%.40s: %p", t, lua_touserdata(L, 1));
case LUA_TUSERDATA:
sprintf(buff, "userdata: %p", lua_touserdata(L, 1));
break;
}
case LUA_TNIL:
lua_pushliteral(L, "nil");
return 1;
default:
luaL_argerror(L, 1, "value expected");
}
lua_pushstring(L, buff);
return 1;
@@ -426,7 +423,7 @@ static const luaL_reg base_funcs[] = {
static void base_open (lua_State *L) {
lua_pushliteral(L, "_G");
lua_pushvalue(L, LUA_GLOBALSINDEX);
luaL_openlib(L, base_funcs); /* open lib into global table */
luaL_openlib(L, base_funcs, 0); /* open lib into global table */
lua_pushliteral(L, "_VERSION");
lua_pushliteral(L, LUA_VERSION);
lua_settable(L, -3); /* set global _VERSION */
@@ -495,7 +492,7 @@ static const luaL_reg co_funcs[] = {
static void co_open (lua_State *L) {
luaL_opennamedlib(L, "co", co_funcs);
luaL_opennamedlib(L, "co", co_funcs, 0);
/* create metatable for coroutines */
lua_pushliteral(L, "Coroutine");
lua_newtable(L);
@@ -728,7 +725,7 @@ static const luaL_reg array_funcs[] = {
LUALIB_API int lua_baselibopen (lua_State *L) {
base_open(L);
co_open(L);
luaL_opennamedlib(L, "A", array_funcs);
luaL_opennamedlib(L, "tab", array_funcs, 0);
/* `require' needs an empty table as upvalue */
lua_newtable(L);
lua_pushcclosure(L, luaB_require, 1);