2812
|
1 |
/*
|
|
2 |
** $Id: ltm.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
|
|
3 |
** Tag methods
|
|
4 |
** See Copyright Notice in lua.h
|
|
5 |
*/
|
|
6 |
|
|
7 |
|
|
8 |
#include <string.h>
|
|
9 |
|
|
10 |
#define ltm_c
|
|
11 |
#define LUA_CORE
|
|
12 |
|
|
13 |
#include "lua.h"
|
|
14 |
|
|
15 |
#include "lobject.h"
|
|
16 |
#include "lstate.h"
|
|
17 |
#include "lstring.h"
|
|
18 |
#include "ltable.h"
|
|
19 |
#include "ltm.h"
|
|
20 |
|
|
21 |
|
|
22 |
|
|
23 |
const char *const luaT_typenames[] = {
|
|
24 |
"nil", "boolean", "userdata", "number",
|
|
25 |
"string", "table", "function", "userdata", "thread",
|
|
26 |
"proto", "upval"
|
|
27 |
};
|
|
28 |
|
|
29 |
|
|
30 |
void luaT_init (lua_State *L) {
|
|
31 |
static const char *const luaT_eventname[] = { /* ORDER TM */
|
|
32 |
"__index", "__newindex",
|
|
33 |
"__gc", "__mode", "__eq",
|
|
34 |
"__add", "__sub", "__mul", "__div", "__mod",
|
|
35 |
"__pow", "__unm", "__len", "__lt", "__le",
|
|
36 |
"__concat", "__call"
|
|
37 |
};
|
|
38 |
int i;
|
|
39 |
for (i=0; i<TM_N; i++) {
|
|
40 |
G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]);
|
|
41 |
luaS_fix(G(L)->tmname[i]); /* never collect these names */
|
|
42 |
}
|
|
43 |
}
|
|
44 |
|
|
45 |
|
|
46 |
/*
|
|
47 |
** function to be used with macro "fasttm": optimized for absence of
|
|
48 |
** tag methods
|
|
49 |
*/
|
|
50 |
const TValue *luaT_gettm (Table *events, TMS event, TString *ename) {
|
|
51 |
const TValue *tm = luaH_getstr(events, ename);
|
|
52 |
lua_assert(event <= TM_EQ);
|
|
53 |
if (ttisnil(tm)) { /* no tag method? */
|
|
54 |
events->flags |= cast_byte(1u<<event); /* cache this fact */
|
|
55 |
return NULL;
|
|
56 |
}
|
|
57 |
else return tm;
|
|
58 |
}
|
|
59 |
|
|
60 |
|
|
61 |
const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o, TMS event) {
|
|
62 |
Table *mt;
|
|
63 |
switch (ttype(o)) {
|
|
64 |
case LUA_TTABLE:
|
|
65 |
mt = hvalue(o)->metatable;
|
|
66 |
break;
|
|
67 |
case LUA_TUSERDATA:
|
|
68 |
mt = uvalue(o)->metatable;
|
|
69 |
break;
|
|
70 |
default:
|
|
71 |
mt = G(L)->mt[ttype(o)];
|
|
72 |
}
|
|
73 |
return (mt ? luaH_getstr(mt, G(L)->tmname[event]) : luaO_nilobject);
|
|
74 |
}
|
|
75 |
|