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This commit is contained in:
Roberto Ierusalimschy 1999-01-15 11:11:57 -02:00
parent 54840fb256
commit 3fecf187ff
2 changed files with 24 additions and 38 deletions
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56
ltm.c
View File

@ -1,5 +1,5 @@
/*
** $Id: ltm.c,v 1.18 1998/12/22 18:10:50 roberto Exp roberto $
** $Id: ltm.c,v 1.19 1999/01/13 19:08:10 roberto Exp roberto $
** Tag methods
** See Copyright Notice in lua.h
*/
@ -22,8 +22,7 @@ char *luaT_eventname[] = { /* ORDER IM */
};
static int luaI_checkevent (char *name, char *list[])
{
static int luaI_checkevent (char *name, char *list[]) {
int e = luaL_findstring(name, list);
if (e < 0)
luaL_verror("`%.50s' is not a valid event name", name);
@ -35,7 +34,7 @@ static int luaI_checkevent (char *name, char *list[])
/* events in LUA_T_NIL are all allowed, since this is used as a
* 'placeholder' for "default" fallbacks
*/
static char validevents[NUM_TAGS][IM_N] = { /* ORDER LUA_T, ORDER IM */
static char luaT_validevents[NUM_TAGS][IM_N] = { /* ORDER LUA_T, ORDER IM */
{1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1}, /* LUA_T_USERDATA */
{1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1}, /* LUA_T_NUMBER */
{1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, /* LUA_T_STRING */
@ -45,22 +44,19 @@ static char validevents[NUM_TAGS][IM_N] = { /* ORDER LUA_T, ORDER IM */
{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1} /* LUA_T_NIL */
};
static int validevent (int t, int e) { /* ORDER LUA_T */
return (t < LUA_T_NIL) ? 1 : validevents[-t][e];
static int luaT_validevent (int t, int e) { /* ORDER LUA_T */
return (t < LUA_T_NIL) ? 1 : luaT_validevents[-t][e];
}
static void init_entry (int tag)
{
static void init_entry (int tag) {
int i;
for (i=0; i<IM_N; i++)
ttype(luaT_getim(tag, i)) = LUA_T_NIL;
}
void luaT_init (void)
{
void luaT_init (void) {
int t;
L->IMtable_size = NUM_TAGS*2;
L->last_tag = -(NUM_TAGS-1);
@ -70,8 +66,7 @@ void luaT_init (void)
}
int lua_newtag (void)
{
int lua_newtag (void) {
--L->last_tag;
if ((-L->last_tag) >= L->IMtable_size)
L->IMtable_size = luaM_growvector(&L->IMtable, L->IMtable_size,
@ -81,34 +76,30 @@ int lua_newtag (void)
}
static void checktag (int tag)
{
static void checktag (int tag) {
if (!(L->last_tag <= tag && tag <= 0))
luaL_verror("%d is not a valid tag", tag);
}
void luaT_realtag (int tag)
{
void luaT_realtag (int tag) {
if (!(L->last_tag <= tag && tag < LUA_T_NIL))
luaL_verror("tag %d is not result of `newtag'", tag);
}
int lua_copytagmethods (int tagto, int tagfrom)
{
int lua_copytagmethods (int tagto, int tagfrom) {
int e;
checktag(tagto);
checktag(tagfrom);
for (e=0; e<IM_N; e++) {
if (validevent(tagto, e))
if (luaT_validevent(tagto, e))
*luaT_getim(tagto, e) = *luaT_getim(tagfrom, e);
}
return tagto;
}
int luaT_efectivetag (TObject *o)
{
int luaT_effectivetag (TObject *o) {
int t;
switch (t = ttype(o)) {
case LUA_T_ARRAY:
@ -130,23 +121,21 @@ int luaT_efectivetag (TObject *o)
}
TObject *luaT_gettagmethod (int t, char *event)
{
TObject *luaT_gettagmethod (int t, char *event) {
int e = luaI_checkevent(event, luaT_eventname);
checktag(t);
if (validevent(t, e))
if (luaT_validevent(t, e))
return luaT_getim(t,e);
else
return &luaO_nilobject;
}
void luaT_settagmethod (int t, char *event, TObject *func)
{
void luaT_settagmethod (int t, char *event, TObject *func) {
TObject temp = *func;
int e = luaI_checkevent(event, luaT_eventname);
checktag(t);
if (!validevent(t, e))
if (!luaT_validevent(t, e))
luaL_verror("cannot change tag method `%.20s' for type `%.20s'%.20s",
luaT_eventname[e], luaO_typenames[-t],
(t == LUA_T_ARRAY || t == LUA_T_USERDATA) ? " with default tag"
@ -189,23 +178,20 @@ static void errorFB (void)
static void nilFB (void) { }
static void typeFB (void)
{
static void typeFB (void) {
lua_error("unexpected type");
}
static void fillvalids (IMS e, TObject *func)
{
static void fillvalids (IMS e, TObject *func) {
int t;
for (t=LUA_T_NIL; t<=LUA_T_USERDATA; t++)
if (validevent(t, e))
if (luaT_validevent(t, e))
*luaT_getim(t, e) = *func;
}
void luaT_setfallback (void)
{
void luaT_setfallback (void) {
static char *oldnames [] = {"error", "getglobal", "arith", "order", NULL};
TObject oldfunc;
lua_CFunction replace;

6
ltm.h
View File

@ -1,5 +1,5 @@
/*
** $Id: ltm.h,v 1.3 1997/11/19 17:29:23 roberto Exp roberto $
** $Id: ltm.h,v 1.4 1997/11/26 18:53:45 roberto Exp roberto $
** Tag methods
** See Copyright Notice in lua.h
*/
@ -45,14 +45,14 @@ struct IM {
#define luaT_getim(tag,event) (&L->IMtable[-(tag)].int_method[event])
#define luaT_getimbyObj(o,e) (luaT_getim(luaT_efectivetag(o),(e)))
#define luaT_getimbyObj(o,e) (luaT_getim(luaT_effectivetag(o),(e)))
extern char *luaT_eventname[];
void luaT_init (void);
void luaT_realtag (int tag);
int luaT_efectivetag (TObject *o);
int luaT_effectivetag (TObject *o);
void luaT_settagmethod (int t, char *event, TObject *func);
TObject *luaT_gettagmethod (int t, char *event);
char *luaT_travtagmethods (int (*fn)(TObject *));