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  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.  
  76.