root/src/lua/src/ltm.c

Revision 22d1941d0ca5ba7027cdfa51ce34bd1d8fb1931e, 1.6 kB (checked in by Theo Schlossnagle <jesus@omniti.com>, 10 years ago)

take the version out... it is what it is

  • Property mode set to 100644
Line 
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
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