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/*jshint esversion: 6 */
"use strict";
const assert = require('assert');
const defs = require('./defs.js');
const lobject = require('./lobject.js');
const ldo = require('./ldo.js');
const lstate = require('./lstate.js');
const lstring = require('./lstring.js');
const ltable = require('./ltable.js');
const ldebug = require('./ldebug.js');
const lvm = require('./lvm.js');
const CT = defs.constant_types;
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 => defs.to_luastring(e));
const ttypename = function(t) {
return luaT_typenames_[t + 1];
};
/*
* WARNING: if you change the order of this enumeration,
* grep "ORDER TM" and "ORDER OP"
*/
const TMS = {
TM_INDEX: 0,
TM_NEWINDEX: 1,
TM_GC: 2,
TM_MODE: 3,
TM_LEN: 4,
TM_EQ: 5, /* last tag method with fast access */
TM_ADD: 6,
TM_SUB: 7,
TM_MUL: 8,
TM_MOD: 9,
TM_POW: 10,
TM_DIV: 11,
TM_IDIV: 12,
TM_BAND: 13 ,
TM_BOR: 14,
TM_BXOR: 15,
TM_SHL: 16,
TM_SHR: 17,
TM_UNM: 18,
TM_BNOT: 19,
TM_LT: 20,
TM_LE: 21,
TM_CONCAT: 22,
TM_CALL: 23,
TM_N: 24 /* number of elements in the enum */
};
const luaT_init = function(L) {
L.l_G.tmname[TMS.TM_INDEX] = new lstring.luaS_new(L, defs.to_luastring("__index", true));
L.l_G.tmname[TMS.TM_NEWINDEX] = new lstring.luaS_new(L, defs.to_luastring("__newindex", true));
L.l_G.tmname[TMS.TM_GC] = new lstring.luaS_new(L, defs.to_luastring("__gc", true));
L.l_G.tmname[TMS.TM_MODE] = new lstring.luaS_new(L, defs.to_luastring("__mode", true));
L.l_G.tmname[TMS.TM_LEN] = new lstring.luaS_new(L, defs.to_luastring("__len", true));
L.l_G.tmname[TMS.TM_EQ] = new lstring.luaS_new(L, defs.to_luastring("__eq", true));
L.l_G.tmname[TMS.TM_ADD] = new lstring.luaS_new(L, defs.to_luastring("__add", true));
L.l_G.tmname[TMS.TM_SUB] = new lstring.luaS_new(L, defs.to_luastring("__sub", true));
L.l_G.tmname[TMS.TM_MUL] = new lstring.luaS_new(L, defs.to_luastring("__mul", true));
L.l_G.tmname[TMS.TM_MOD] = new lstring.luaS_new(L, defs.to_luastring("__mod", true));
L.l_G.tmname[TMS.TM_POW] = new lstring.luaS_new(L, defs.to_luastring("__pow", true));
L.l_G.tmname[TMS.TM_DIV] = new lstring.luaS_new(L, defs.to_luastring("__div", true));
L.l_G.tmname[TMS.TM_IDIV] = new lstring.luaS_new(L, defs.to_luastring("__idiv", true));
L.l_G.tmname[TMS.TM_BAND] = new lstring.luaS_new(L, defs.to_luastring("__band", true));
L.l_G.tmname[TMS.TM_BOR] = new lstring.luaS_new(L, defs.to_luastring("__bor", true));
L.l_G.tmname[TMS.TM_BXOR] = new lstring.luaS_new(L, defs.to_luastring("__bxor", true));
L.l_G.tmname[TMS.TM_SHL] = new lstring.luaS_new(L, defs.to_luastring("__shl", true));
L.l_G.tmname[TMS.TM_SHR] = new lstring.luaS_new(L, defs.to_luastring("__shr", true));
L.l_G.tmname[TMS.TM_UNM] = new lstring.luaS_new(L, defs.to_luastring("__unm", true));
L.l_G.tmname[TMS.TM_BNOT] = new lstring.luaS_new(L, defs.to_luastring("__bnot", true));
L.l_G.tmname[TMS.TM_LT] = new lstring.luaS_new(L, defs.to_luastring("__lt", true));
L.l_G.tmname[TMS.TM_LE] = new lstring.luaS_new(L, defs.to_luastring("__le", true));
L.l_G.tmname[TMS.TM_CONCAT] = new lstring.luaS_new(L, defs.to_luastring("__concat", true));
L.l_G.tmname[TMS.TM_CALL] = new lstring.luaS_new(L, defs.to_luastring("__call", true));
};
/*
** Return the name of the type of an object. For tables and userdata
** with metatable, use their '__name' metafield, if present.
*/
const __name = defs.to_luastring('__name', true);
const luaT_objtypename = function(L, o) {
let mt;
if ((o.ttistable() && (mt = o.value.metatable) !== null) ||
(o.ttisfulluserdata() && (mt = o.value.metatable) !== null)) {
let name = ltable.luaH_getstr(mt, lstring.luaS_bless(L, __name));
if (name.ttisstring())
return name.svalue();
}
return ttypename(o.ttnov());
};
const luaT_callTM = function(L, f, p1, p2, p3, hasres) {
let func = L.top;
L.stack[L.top] = new lobject.TValue(f.type, f.value); /* push function (assume EXTRA_STACK) */
L.stack[L.top + 1] = new lobject.TValue(p1.type, p1.value); /* 1st argument */
L.stack[L.top + 2] = new lobject.TValue(p2.type, p2.value); /* 2nd argument */
L.top += 3;
if (!hasres) /* no result? 'p3' is third argument */
L.stack[L.top++] = new lobject.TValue(p3.type, p3.value); /* 3rd argument */
if (L.ci.callstatus & lstate.CIST_LUA)
ldo.luaD_call(L, func, hasres);
else
ldo.luaD_callnoyield(L, func, hasres);
if (hasres) { /* if has result, move it to its place */
lobject.setobjs2s(L, p3, --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, defs.to_luastring("perform bitwise operation on", true));
}
default:
ldebug.luaG_opinterror(L, p1, p2, defs.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 fasttm = function(l, et, e) {
return et === null ? null :
(et.flags & (1 << e)) ? null : luaT_gettm(et, e, l.l_G.tmname[e]);
};
const luaT_gettm = function(events, event, ename) {
const tm = ltable.luaH_getstr(events, ename);
assert(event <= TMS.TM_EQ);
if (tm.ttisnil()) { /* no tag method? */
events.flags |= 1<<event; /* cache this fact */
return null;
}
else return tm;
};
const luaT_gettmbyobj = function(L, o, event) {
let mt;
switch(o.ttnov()) {
case CT.LUA_TTABLE:
case CT.LUA_TUSERDATA:
mt = o.value.metatable;
break;
default:
mt = L.l_G.mt[o.ttnov()];
}
return mt ? ltable.luaH_getstr(mt, L.l_G.tmname[event]) : lobject.luaO_nilobject;
};
module.exports.fasttm = fasttm;
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_gettm = luaT_gettm;
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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