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comparison src/lua/ltm.c @ 11:27763b933818

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raise lua sources up one level
author Robert McIntyre <rlm@mit.edu>
date Sat, 03 Mar 2012 11:07:39 -0600
parents src/lua/src/ltm.c@f9f4f1b99eed
children
comparison
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10:48b74a4e4692 11:27763b933818
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