/* ** $Id: ltm.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $ ** Tag methods ** See Copyright Notice in lua.h */ #define ltm_c #define LUA_CORE #define LUAC_CROSS_FILE #include "lua.h" #include #include "lobject.h" #include "lstate.h" #include "lgc.h" #include "lstring.h" #include "ltable.h" #include "ltm.h" #include "lrotable.h" const char *const luaT_typenames[] = { "nil", "boolean", "romtable", "lightfunction", "userdata", "number", "string", "table", "function", "userdata", "thread", "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" }; 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; lua_assert(event <= TM_EQ); if (luaR_isrotable(events)) { tm = luaH_getstr_ro(events, ename); if (ttisnil(tm)) { /* no tag method? */ return NULL; } } else { tm = luaH_getstr(events, ename); if (ttisnil(tm)) { /* no tag method? */ events->flags |= cast_byte(1u<metatable; break; case LUA_TROTABLE: mt = (Table*)luaR_getmeta(rvalue(o)); break; case LUA_TUSERDATA: mt = uvalue(o)->metatable; break; default: mt = G(L)->mt[ttype(o)]; } if (!mt) return luaO_nilobject; else if (luaR_isrotable(mt)) return luaH_getstr_ro(mt, G(L)->tmname[event]); else return luaH_getstr(mt, G(L)->tmname[event]); }