94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
/*
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** $Id: ltm.c,v 2.8.1.1 2007/12/27 13:02:25 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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#define ltm_c
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#define LUA_CORE
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#define LUAC_CROSS_FILE
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#include "lua.h"
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#include <string.h>
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#include "lobject.h"
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#include "lstate.h"
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#include "lgc.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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#include "lrotable.h"
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const char *const luaT_typenames[] = {
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"nil", "boolean", "romtable", "lightfunction", "userdata", "number",
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"string", "table", "function", "userdata", "thread",
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"proto", "upval"
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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", "__eq",
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"__add", "__sub", "__mul", "__div", "__mod",
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"__pow", "__unm", "__len", "__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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stringfix(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;
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lua_assert(event <= TM_EQ);
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if (luaR_isrotable(events)) {
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tm = luaH_getstr_ro(events, ename);
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if (ttisnil(tm)) { /* no tag method? */
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return NULL;
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}
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} else {
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tm = luaH_getstr(events, ename);
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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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}
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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 (ttype(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_TROTABLE:
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mt = (Table*)luaR_getmeta(rvalue(o));
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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[ttype(o)];
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}
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if (!mt)
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return luaO_nilobject;
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else if (luaR_isrotable(mt))
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return luaH_getstr_ro(mt, G(L)->tmname[event]);
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else
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return luaH_getstr(mt, G(L)->tmname[event]);
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}
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