0,0 → 1,77 |
/* |
** $Id: ltm.c,v 2.14 2011/06/02 19:31:40 roberto Exp $ |
** Tag methods |
** See Copyright Notice in lua.h |
*/ |
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#include <string.h> |
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#define ltm_c |
#define LUA_CORE |
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#include "lua.h" |
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#include "lobject.h" |
#include "lstate.h" |
#include "lstring.h" |
#include "ltable.h" |
#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] = { |
"no value", |
"nil", "boolean", udatatypename, "number", |
"string", "table", "function", udatatypename, "thread", |
"proto", "upval" /* these last two cases are used for tests only */ |
}; |
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void luaT_init (lua_State *L) { |
static const char *const luaT_eventname[] = { /* ORDER TM */ |
"__index", "__newindex", |
"__gc", "__mode", "__len", "__eq", |
"__add", "__sub", "__mul", "__div", "__mod", |
"__pow", "__unm", "__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 */ |
} |
} |
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/* |
** 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; |
} |
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const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o, TMS event) { |
Table *mt; |
switch (ttypenv(o)) { |
case LUA_TTABLE: |
mt = hvalue(o)->metatable; |
break; |
case LUA_TUSERDATA: |
mt = uvalue(o)->metatable; |
break; |
default: |
mt = G(L)->mt[ttypenv(o)]; |
} |
return (mt ? luaH_getstr(mt, G(L)->tmname[event]) : luaO_nilobject); |
} |
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