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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 ldebug = require('./ldebug.js');
const lvm = require('./lvm.js');
const CT = lua.constant_types;
const TMS = {
TM_INDEX: lua.to_luastring("__index", true),
TM_NEWINDEX: lua.to_luastring("__newindex", true),
TM_GC: lua.to_luastring("__gc", true),
TM_MODE: lua.to_luastring("__mode", true),
TM_LEN: lua.to_luastring("__len", true),
TM_EQ: lua.to_luastring("__eq", true), /* last tag method with fast access */
TM_ADD: lua.to_luastring("__add", true),
TM_SUB: lua.to_luastring("__sub", true),
TM_MUL: lua.to_luastring("__mul", true),
TM_MOD: lua.to_luastring("__mod", true),
TM_POW: lua.to_luastring("__pow", true),
TM_DIV: lua.to_luastring("__div", true),
TM_IDIV: lua.to_luastring("__idiv", true),
TM_BAND: lua.to_luastring("__band", true),
TM_BOR: lua.to_luastring("__bor", true),
TM_BXOR: lua.to_luastring("__bxor", true),
TM_SHL: lua.to_luastring("__shl", true),
TM_SHR: lua.to_luastring("__shr", true),
TM_UNM: lua.to_luastring("__unm", true),
TM_BNOT: lua.to_luastring("__bnot", true),
TM_LT: lua.to_luastring("__lt", true),
TM_LE: lua.to_luastring("__le", true),
TM_CONCAT: lua.to_luastring("__concat", true),
TM_CALL: lua.to_luastring("__call", true)
};
const luaT_typenames_ = [
"no value",
"nil",
"boolean",
"userdata",
"number",
"string",
"table",
"function",
"userdata",
"thread",
"proto" /* this last case is used for tests only */
].map(e => lua.to_luastring(e));
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(L.l_G.intern(TMS[event]));
};
/*
** 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, lua.to_luastring('__name', true));
if (name.ttisstring())
return name.jsstring();
}
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)) {
switch (event) {
case TMS.TM_CONCAT:
ldebug.luaG_concaterror(L, p1, p2);
case TMS.TM_BAND: case TMS.TM_BOR: case TMS.TM_BXOR:
case TMS.TM_SHL: case TMS.TM_SHR: case TMS.TM_BNOT: {
let n1 = lvm.tonumber(p1);
let n2 = lvm.tonumber(p2);
if (n1 !== false && n2 !== false)
ldebug.luaG_tointerror(L, p1, p2);
else
ldebug.luaG_opinterror(L, p1, p2, lua.to_luastring("perform bitwise operation on", true));
}
default:
ldebug.luaG_opinterror(L, p1, p2, lua.to_luastring("perform arithmetic on", true));
}
}
};
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:
mt = L.l_G.mt[o.ttnov()];
}
return mt ? mt.__index(mt, event) : lobject.luaO_nilobject;
};
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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