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/*jshint esversion: 6 */
"use strict";
const lobject = require('./lobject.js');
const TValue = lobject.TValue;
const Table = lobject.Table;
const ldo = require('./ldo.js');
const lstate = require('./lstate.js');
const lua = require('./lua.js');
const CT = lua.constant_types;
const TMS = {
TM_INDEX: "__index",
TM_NEWINDEX: "__newindex",
TM_GC: "__gc",
TM_MODE: "__mode",
TM_LEN: "__len",
TM_EQ: "__eq", /* last tag method with fast access */
TM_ADD: "__add",
TM_SUB: "__sub",
TM_MUL: "__mul",
TM_MOD: "__mod",
TM_POW: "__pow",
TM_DIV: "__div",
TM_IDIV: "__idiv",
TM_BAND: "__band",
TM_BOR: "__bor",
TM_BXOR: "__bxor",
TM_SHL: "__shl",
TM_SHR: "__shr",
TM_UNM: "__unm",
TM_BNOT: "__bnot",
TM_LT: "__lt",
TM_LE: "__le",
TM_CONCAT: "__concat",
TM_CALL: "__call",
TM_N: 26
};
const luaT_callTM = function(L, f, p1, p2, p3, hasres) {
let result = p3;
let func = L.top;
L.stack[L.top] = f; /* push function (assume EXTRA_STACK) */
L.stack[L.top + 1] = p1; /* 1st argument */
L.stack[L.top + 2] = p2; /* 2nd argument */
L.top += 3;
if (!hasres) /* no result? 'p3' is third argument */
L.stack[L.top++] = p3; /* 3rd argument */
if (L.ci.callstatus & lstate.CIST_LUA)
ldo.luaD_call(L, func, hasres);
else
ldo.luaD_callnoyield(L, func, hasres);
if (hasres) {
L.stack[result] = L.stack[--L.top];
}
};
const luaT_callbinTM = function(L, p1, p2, res, event) {
let tm = luaT_gettmbyobj(L, p1, event);
if (tm.ttisnil())
tm = luaT_gettmbyobj(L, p2, event);
if (tm.ttisnil()) return false;
luaT_callTM(L, tm, p1, p2, res, 1);
return true;
};
const luaT_trybinTM = function(L, p1, p2, res, event) {
if (!luaT_gettmbyobj(L, p1, p2, res, event)) {
throw new Error("TM error"); // TODO: luaG_error
}
};
const luaT_callorderTM = function(L, p1, p2, event) {
if (!luaT_callbinTM(L, p2, p2, L.top, event))
return -1;
else
return !L.stack[L.top].l_isfalse() ? 1 : 0;
};
const luaT_gettmbyobj = function(L, o, event) {
let mt;
switch(o.ttnov()) {
case CT.LUA_TTABLE:
case CT.LUA_TTUSERDATA:
mt = o.value.metatable;
break;
default:
// TODO: mt = G(L)->mt[ttnov(o)];
}
return mt ? mt.__index(mt, event) : ldo.nil;
};
module.exports = {
TMS: TMS,
luaT_callTM: luaT_callTM,
luaT_callbinTM: luaT_callbinTM,
luaT_trybinTM: luaT_trybinTM,
luaT_callorderTM: luaT_callorderTM,
luaT_gettmbyobj: luaT_gettmbyobj
};
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