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tag system replaced by event tables

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This commit is contained in:
Roberto Ierusalimschy
2001-12-05 18:15:18 -02:00
parent 413fc7334b
commit 592a309177
24 changed files with 417 additions and 711 deletions
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175
ltm.c
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@@ -1,5 +1,5 @@
/*
** $Id: ltm.c,v 1.80 2001/10/11 21:41:21 roberto Exp $
** $Id: ltm.c,v 1.1 2001/11/29 22:14:34 rieru Exp rieru $
** Tag methods
** See Copyright Notice in lua.h
*/
@@ -10,8 +10,6 @@
#include "lua.h"
#include "ldo.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#include "lstring.h"
@@ -19,161 +17,46 @@
#include "ltm.h"
const char *const luaT_eventname[] = { /* ORDER TM */
"gettable", "settable", "index", "getglobal",
"setglobal", "add", "sub", "mul", "div",
"pow", "unm", "lt", "concat", "gc",
"function",
NULL
const char *const luaT_typenames[] = {
"userdata", "nil", "number", "string", "table", "function"
};
static int findevent (const char *name) {
int i;
for (i=0; luaT_eventname[i]; i++)
if (strcmp(luaT_eventname[i], name) == 0)
return i;
return -1; /* name not found */
}
static int luaI_checkevent (lua_State *L, const char *name) {
int e = findevent(name);
if (e < 0)
luaO_verror(L, "`%.50s' is not a valid event name", name);
return e;
}
/* events in LUA_TNIL are all allowed, since this is used as a
* `placeholder' for default fallbacks
*/
/* ORDER LUA_T, ORDER TM */
static const lu_byte luaT_validevents[NUM_TAGS][TM_N] = {
{1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1}, /* LUA_TUSERDATA */
{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, /* LUA_TNIL */
{1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1}, /* LUA_TNUMBER */
{1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, /* LUA_TSTRING */
{0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1}, /* LUA_TTABLE */
{1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0} /* LUA_TFUNCTION */
};
static int luaT_validevent (int t, int e) { /* ORDER LUA_T */
return (t >= NUM_TAGS) ? 1 : cast(int, luaT_validevents[t][e]);
}
void luaT_init (lua_State *L) {
static const char *const typenames[NUM_TAGS] = {
"userdata", "nil", "number", "string",
"table", "function"
static const char *const luaT_eventname[] = { /* ORDER TM */
"gettable", "settable", "index",
"gc",
"add", "sub", "mul", "div",
"pow", "unm", "lt", "concat",
"call"
};
int i;
for (i=0; i<NUM_TAGS; i++)
luaT_newtag(L, typenames[i], i);
}
int luaT_newtag (lua_State *L, const char *name, int basictype) {
int tag;
int i;
TString *ts = NULL;
luaM_growvector(L, G(L)->TMtable, G(L)->ntag, G(L)->sizeTM, struct TM,
MAX_INT, "tag table overflow");
tag = G(L)->ntag;
if (name) {
const TObject *v;
TObject otag;
ts = luaS_new(L, name);
v = luaH_getstr(G(L)->type2tag, ts);
if (ttype(v) == LUA_TNUMBER) return cast(int, nvalue(v));
setnvalue(&otag, tag);
luaH_setstr(L, G(L)->type2tag, ts, &otag);
}
for (i=0; i<TM_N; i++)
luaT_gettm(G(L), tag, i) = NULL;
G(L)->TMtable[tag].collected = NULL;
G(L)->TMtable[tag].name = ts;
G(L)->TMtable[tag].basictype = basictype;
G(L)->ntag++;
return tag;
}
static void checktag (lua_State *L, int tag) {
if (!(0 <= tag && tag < G(L)->ntag))
luaO_verror(L, "%d is not a valid tag", tag);
}
int luaT_tag (const TObject *o) {
int t = ttype(o);
switch (t) {
case LUA_TUSERDATA: return uvalue(o)->uv.tag;
case LUA_TTABLE: return hvalue(o)->htag;
default: return t;
for (i=0; i<TM_N; i++) {
G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]);
G(L)->tmname[i]->tsv.marked = FIXMARK; /* never collect these names */
}
}
const char *luaT_typename (global_State *G, const TObject *o) {
int t = ttype(o);
int tag;
TString *ts;
switch (t) {
case LUA_TUSERDATA:
tag = uvalue(o)->uv.tag;
break;
const TObject *luaT_gettm (Table *events, TMS event, TString *ename) {
const TObject *tm = luaH_getstr(events, ename);
if (ttype(tm) == LUA_TNIL) { /* no tag method? */
events->flags |= (1<<event); /* cache this fact */
return NULL;
}
else return tm;
}
const TObject *luaT_gettmbyobj (lua_State *L, const TObject *o, TMS event) {
switch (ttype(o)) {
case LUA_TTABLE:
tag = hvalue(o)->htag;
break;
return fasttm(L, hvalue(o)->eventtable, event);
case LUA_TUSERDATA:
return fasttm(L, uvalue(o)->uv.eventtable, event);
default:
tag = t;
return NULL;
}
ts = G->TMtable[tag].name;
if (ts == NULL)
ts = G->TMtable[t].name;
return getstr(ts);
}
LUA_API void lua_gettagmethod (lua_State *L, int t, const char *event) {
int e;
lua_lock(L);
e = luaI_checkevent(L, event);
checktag(L, t);
if (luaT_validevent(t, e) && luaT_gettm(G(L), t, e)) {
setclvalue(L->top, luaT_gettm(G(L), t, e));
}
else
setnilvalue(L->top);
incr_top;
lua_unlock(L);
}
LUA_API void lua_settagmethod (lua_State *L, int t, const char *event) {
int e;
lua_lock(L);
e = luaI_checkevent(L, event);
checktag(L, t);
if (!luaT_validevent(t, e))
luaO_verror(L, "cannot change `%.20s' tag method for type `%.20s'%.20s",
luaT_eventname[e], typenamebytag(G(L), t),
(t == LUA_TTABLE || t == LUA_TUSERDATA) ?
" with default tag" : "");
switch (ttype(L->top - 1)) {
case LUA_TNIL:
luaT_gettm(G(L), t, e) = NULL;
break;
case LUA_TFUNCTION:
luaT_gettm(G(L), t, e) = clvalue(L->top - 1);
break;
default:
luaD_error(L, "tag method must be a function (or nil)");
}
L->top--;
lua_unlock(L);
}