/* ** $Id: ltm.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $ ** Tag methods ** See Copyright Notice in lua.h */ #include #define ltm_c #define LUA_CORE #include "lua.h" #include "lobject.h" #include "lstate.h" #include "lstring.h" #include "ltable.h" #include "ltm.h" /* These must be correspond to the LUA_T* defines in lua.h */ const char *const luaT_typenames[] = { "nil", "boolean", "lightfunction","number", // base type = 0, 1, 2, 3 "string", "table", "function", "userdata", "thread", // base type = 4, 5, 6, 7, 8 "proto", "upval" }; void luaT_init (lua_State *L) { static const char *const luaT_eventname[] = { /* ORDER TM */ "__index", "__newindex", "__gc", "__mode", "__eq", "__add", "__sub", "__mul", "__div", "__mod", "__pow", "__unm", "__len", "__lt", "__le", "__concat", "__call", "__metatable" }; int i; for (i=0; itmname[i] = luaS_new(L, luaT_eventname[i]); stringfix(G(L)->tmname[i]); /* never collect these names */ } } /* ** function to be used with macro "fasttm": optimized for absence of ** tag methods */ const TValue *luaT_gettm (Table *events, TMS event, TString *ename) { const TValue *tm = luaH_getstr(events, ename); lua_assert(event <= TM_EQ); if (ttisnil(tm)) { /* no tag method? */ if (isrwtable(events)) /* if this a (RW) Table */ events->flags |= cast_byte(1u<metatable; break; case LUA_TUSERDATA: mt = uvalue(o)->metatable; break; default: mt = G(L)->mt[ttnov(o)]; } return (mt ? luaH_getstr(mt, G(L)->tmname[event]) : luaO_nilobject); }