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/27 13:02:25 roberto Exp $ ** Tag methods ** See Copyright Notice in lua.h */ #include <string.h> #define ltm_c #define LUA_CORE #include "lua.h" #include "lobject.h" #include "lstate.h" #include "lstring.h" #include "ltable.h" #include "ltm.h" const char *const luaT_typenames[] = { "nil", "boolean", "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; i<TM_N; i++) { G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]); luaS_fix(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? */ events->flags |= cast_byte(1u<<event); /* cache this fact */ return NULL; } else return tm; } const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o, TMS event) { Table *mt; switch (ttype(o)) { case LUA_TTABLE: mt = hvalue(o)->metatable; break; case LUA_TUSERDATA: mt = uvalue(o)->metatable; break; default: mt = G(L)->mt[ttype(o)]; }