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/*jshint esversion: 6 */
"use strict";
const assert = require('assert');
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_typenames_ = [
"no value",
"nil",
"boolean",
"userdata",
"number",
"string",
"table",
"function",
"userdata",
"thread",
"proto" /* this last case is used for tests only */
];
const ttypename = function(t) {
return luaT_typenames_[t + 1];
};
const luaT_init = function(L) {
L.l_G.tmname = [];
for (let event in TMS) {
L.l_G.tmname.push(new TValue(CT.LUA_TLNGSTR, TMS[event])); // Strings are already interned by JS
}
};
/*
** Return the name of the type of an object. For tables and userdata
** with metatable, use their '__name' metafield, if present.
*/
const luaT_objtypename = function(L, o) {
if ((o.ttistable() && o.metatable !== null)
|| (o.ttisfulluserdata() && o.metatable !== null)) {
let name = o.__index(o, '__name');
if (name.ttisstring())
return name.value;
}
return ttypename(o.ttnov());
};
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) {
assert(typeof result === "number");
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_callbinTM(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, p1, 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.metatable;
break;
default:
// TODO: mt = G(L)->mt[ttnov(o)];
}
return mt ? mt.__index(mt, event) : ldo.nil;
};
module.exports.TMS = TMS;
module.exports.luaT_callTM = luaT_callTM;
module.exports.luaT_callbinTM = luaT_callbinTM;
module.exports.luaT_trybinTM = luaT_trybinTM;
module.exports.luaT_callorderTM = luaT_callorderTM;
module.exports.luaT_gettmbyobj = luaT_gettmbyobj;
module.exports.luaT_init = luaT_init;
module.exports.luaT_objtypename = luaT_objtypename;
module.exports.ttypename = ttypename;
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