78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
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/*
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** $Id: ltm.c,v 2.14.1.1 2013/04/12 18:48:47 roberto Exp $
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** Tag methods
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** See Copyright Notice in lua.h
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*/
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#include <string.h>
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#define ltm_c
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#define LUA_CORE
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#include "lua.h"
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#include "lobject.h"
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#include "lstate.h"
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#include "lstring.h"
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#include "ltable.h"
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#include "ltm.h"
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static const char udatatypename[] = "userdata";
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LUAI_DDEF const char *const luaT_typenames_[LUA_TOTALTAGS] = {
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"no value",
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"nil", "boolean", udatatypename, "number",
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"string", "table", "function", udatatypename, "thread",
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"proto", "upval" /* these last two cases are used for tests only */
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};
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void luaT_init (lua_State *L) {
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static const char *const luaT_eventname[] = { /* ORDER TM */
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"__index", "__newindex",
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"__gc", "__mode", "__len", "__eq",
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"__add", "__sub", "__mul", "__div", "__mod",
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"__pow", "__unm", "__lt", "__le",
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"__concat", "__call"
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};
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int i;
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for (i=0; i<TM_N; i++) {
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G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]);
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luaS_fix(G(L)->tmname[i]); /* never collect these names */
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}
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}
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/*
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** function to be used with macro "fasttm": optimized for absence of
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** tag methods
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*/
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const TValue *luaT_gettm (Table *events, TMS event, TString *ename) {
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const TValue *tm = luaH_getstr(events, ename);
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lua_assert(event <= TM_EQ);
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if (ttisnil(tm)) { /* no tag method? */
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events->flags |= cast_byte(1u<<event); /* cache this fact */
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return NULL;
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}
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else return tm;
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}
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const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o, TMS event) {
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Table *mt;
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switch (ttypenv(o)) {
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case LUA_TTABLE:
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mt = hvalue(o)->metatable;
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break;
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case LUA_TUSERDATA:
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mt = uvalue(o)->metatable;
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break;
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default:
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mt = G(L)->mt[ttypenv(o)];
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}
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return (mt ? luaH_getstr(mt, G(L)->tmname[event]) : luaO_nilobject);
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}
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