/*
** Main operation less than or equal to; return 'l <= r'. If it needs
** a metamethod and there is no '__le', try '__lt', based on
** l <= r iff !(r < l) (assuming a total order). If the metamethod
** yields during this substitution, the continuation has to know
** about it (to negate the result of r<l); bit CIST_LEQ in the call
** status keeps that information.
*/
int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r) {
int res;
if (ttisnumber(l) && ttisnumber(r)) /* both operands are numbers? */
return LEnum(l, r);
else if (ttisstring(l) && ttisstring(r)) /* both are strings? */
return l_strcmp(tsvalue(l), tsvalue(r)) <= 0;
else if ((res = luaT_callorderTM(L, l, r, TM_LE)) >= 0) /* try 'le' */
return res;
else { /* try 'lt': */
L->ci->callstatus |= CIST_LEQ; /* mark it is doing 'lt' for 'le' */
res = luaT_callorderTM(L, r, l, TM_LT);
L->ci->callstatus ^= CIST_LEQ; /* clear mark */
if (res < 0)
luaG_ordererror(L, l, r);
return !res; /* result is negated */
}
}
/*
** Main operation less than; return 'l < r'.
*/
int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) {
int res;
if (ttisnumber(l) && ttisnumber(r)) /* both operands are numbers? */
return LTnum(l, r);
else if (ttisstring(l) && ttisstring(r)) /* both are strings? */
return l_strcmp(tsvalue(l), tsvalue(r)) < 0;
else if ((res = luaT_callorderTM(L, l, r, TM_LT)) < 0) /* no metamethod? */
luaG_ordererror(L, l, r); /* error */
return res;
}
int luaT_callorderiTM (lua_State *L, const TValue *p1, int v2,
int inv, int isfloat, TMS event) {
TValue aux; const TValue *p2;
if (isfloat) {
setfltvalue(&aux, cast_num(v2));
}
else
setivalue(&aux, v2);
if (inv) { /* arguments were exchanged? */
p2 = p1; p1 = &aux; /* correct them */
}
else
p2 = &aux;
return luaT_callorderTM(L, p1, p2, event);
}