lua51 0.1.6

Lua 5.1.5 bindings for Rust.
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/*
** $Id: ltm.c,v 2.8.1.1 2007/12/27 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)];
    }
    return (mt ? luaH_getstr(mt, G(L)->tmname[event]) : luaO_nilobject);
}