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compatibility with old fallback system now provided by external module

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This commit is contained in:
Roberto Ierusalimschy
1999-09-20 11:57:29 -03:00
parent e10788b2ff
commit 04265655a8
5 changed files with 13 additions and 130 deletions
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97
ltm.c
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@@ -1,5 +1,5 @@
/*
** $Id: ltm.c,v 1.25 1999/05/21 19:41:49 roberto Exp roberto $
** $Id: ltm.c,v 1.26 1999/08/16 20:52:00 roberto Exp roberto $
** Tag methods
** See Copyright Notice in lua.h
*/
@@ -45,7 +45,7 @@ static const char luaT_validevents[NUM_TAGS][IM_N] = {
{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1} /* LUA_T_NIL */
};
static int luaT_validevent (int t, int e) { /* ORDER LUA_T */
int luaT_validevent (int t, int e) { /* ORDER LUA_T */
return (t < LUA_T_NIL) ? 1 : luaT_validevents[-t][e];
}
@@ -155,96 +155,3 @@ const char *luaT_travtagmethods (int (*fn)(TObject *)) { /* ORDER IM */
return NULL;
}
/*
* ===================================================================
* compatibility with old fallback system
*/
#ifdef LUA_COMPAT2_5
#include "lapi.h"
#include "lstring.h"
static void errorFB (void)
{
lua_Object o = lua_getparam(1);
if (lua_isstring(o))
fprintf(stderr, "lua: %s\n", lua_getstring(o));
else
fprintf(stderr, "lua: unknown error\n");
}
static void nilFB (void) { }
static void typeFB (void) {
lua_error("unexpected type");
}
static void fillvalids (IMS e, TObject *func) {
int t;
for (t=LUA_T_NIL; t<=LUA_T_USERDATA; t++)
if (luaT_validevent(t, e))
*luaT_getim(t, e) = *func;
}
void luaT_setfallback (void) {
static const char *const oldnames [] = {"error", "getglobal", "arith",
"order", NULL};
TObject oldfunc;
lua_CFunction replace;
const char *name = luaL_check_string(1);
lua_Object func = lua_getparam(2);
luaL_arg_check(lua_isfunction(func), 2, "function expected");
switch (luaL_findstring(name, oldnames)) {
case 0: { /* old error fallback */
TObject *em = &(luaS_new("_ERRORMESSAGE")->u.s.globalval);
oldfunc = *em;
*em = *luaA_Address(func);
replace = errorFB;
break;
}
case 1: /* old getglobal fallback */
oldfunc = *luaT_getim(LUA_T_NIL, IM_GETGLOBAL);
*luaT_getim(LUA_T_NIL, IM_GETGLOBAL) = *luaA_Address(func);
replace = nilFB;
break;
case 2: { /* old arith fallback */
int i;
oldfunc = *luaT_getim(LUA_T_NUMBER, IM_POW);
for (i=IM_ADD; i<=IM_UNM; i++) /* ORDER IM */
fillvalids(i, luaA_Address(func));
replace = typeFB;
break;
}
case 3: { /* old order fallback */
int i;
oldfunc = *luaT_getim(LUA_T_NIL, IM_LT);
for (i=IM_LT; i<=IM_GE; i++) /* ORDER IM */
fillvalids(i, luaA_Address(func));
replace = typeFB;
break;
}
default: {
int e;
if ((e = luaL_findstring(name, luaT_eventname)) >= 0) {
oldfunc = *luaT_getim(LUA_T_NIL, e);
fillvalids(e, luaA_Address(func));
replace = (e == IM_GC || e == IM_INDEX) ? nilFB : typeFB;
}
else {
luaL_verror("`%.50s' is not a valid fallback name", name);
replace = NULL; /* to avoid warnings */
}
}
}
if (oldfunc.ttype != LUA_T_NIL)
luaA_pushobject(&oldfunc);
else
lua_pushcfunction(replace);
}
#endif