78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
/*
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** $Id: ltm.c,v 2.14 2011/06/02 19:31:40 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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