PageRenderTime 22ms CodeModel.GetById 13ms app.highlight 6ms RepoModel.GetById 1ms app.codeStats 0ms

/src/middleware/lua/ltm.c

https://bitbucket.org/vivkin/gam3b00bs/
C | 75 lines | 51 code | 15 blank | 9 comment | 4 complexity | 4ef6dd80b6678def7366157b127dd801 MD5 | raw file
 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
23const char *const luaT_typenames[] = {
24  "nil", "boolean", "userdata", "number",
25  "string", "table", "function", "userdata", "thread",
26  "proto", "upval"
27};
28
29
30void 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*/
50const 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
61const 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