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/*jshint esversion: 6 */
"use strict";
const CT = require('./lua.js').constant_types;
const UpVal = require('./lfunc.js').UpVal;
class TValue {
constructor(type, value) {
this.type = type;
this.value = value;
this.metatable = null;
}
/* type tag of a TValue (bits 0-3 for tags + variant bits 4-5) */
ttype() {
return this.type & 0x3F;
}
/* type tag of a TValue with no variants (bits 0-3) */
ttnov() {
return this.type & 0x0F;
}
checktag(t) {
return this.type === t;
}
checktype(t) {
return this.ttnov() === t;
}
ttisnumber() {
return this.checktype(CT.LUA_TNUMBER);
}
ttisfloat() {
return this.checktag(CT.LUA_TNUMFLT);
}
ttisinteger() {
return this.checktag(CT.LUA_TNUMINT);
}
ttisnil() {
return this.checktag(CT.LUA_TNIL);
}
ttisboolean() {
return this.checktag(CT.LUA_TBOOLEAN);
}
ttislightuserdata() {
return this.checktag(CT.LUA_TLIGHTUSERDATA);
}
ttisstring() {
return this.checktype(CT.LUA_TSTRING);
}
ttisshrstring() {
return this.checktag(CT.LUA_TSHRSTR);
}
ttislngstring() {
return this.checktag(CT.LUA_TLNGSTR);
}
ttistable() {
return this.checktag(CT.LUA_TTABLE);
}
ttisfunction() {
return this.checktype(CT.LUA_TFUNCTION);
}
ttisclosure() {
return (this.type & 0x1F) === CT.LUA_TFUNCTION;
}
ttisCclosure() {
return this.checktag(CT.LUA_TCCL);
}
ttisLclosure() {
return this.checktag(CT.LUA_TLCL);
}
ttislcf() {
return this.checktag(CT.LUA_TLCF);
}
ttisfulluserdata() {
return this.checktag(CT.LUA_TUSERDATA);
}
ttisthread() {
return this.checktag(CT.LUA_TTHREAD);
}
ttisdeadkey() {
return this.checktag(CT.LUA_TDEADKEY);
}
}
class LClosure extends TValue {
constructor(n) {
super(CT.LUA_TLCL, null);
this.p = null;
this.nupvalues = n;
let _ENV = new UpVal();
_ENV.refcount = 0;
_ENV.v = 0; // _ENV is on the stack at index 0
_ENV.u.open.next = null;
_ENV.u.open.touched = true;
this.upvals = [
_ENV
];
this.value = this;
}
}
class TString extends TValue {
constructor(string) {
super(CT.LUA_TSTRING, string);
}
}
class Table extends TValue {
constructor(array, hash) {
super(CT.LUA_TTABLE, {
array: array !== undefined ? array : [],
hash: new Map(hash)
});
this.usermetatable = null;
this.metatable = {
__newindex: function (table, key, value) {
if (key instanceof TValue) {
// Those lua values are used by value, tables and functions by reference
if ([CT.LUA_TNUMBER, CT.LUA_TSTRING, CT.LUA_TSHRSTR, CT.LUA_TLNGSTR, CT.LUA_TNUMFLT, CT.LUA_TNUMINT].indexOf(key.type) > -1) {
key = key.value;
}
}
if (typeof key === 'number') {
table.value.array[key] = value;
} else {
table.value.hash.set(key, value);
}
},
__index: function (table, key) {
if (key instanceof TValue) {
// Those lua values are used by value, tables and functions by reference
if ([CT.LUA_TNUMBER, CT.LUA_TSTRING, CT.LUA_TSHRSTR, CT.LUA_TLNGSTR, CT.LUA_TNUMFLT, CT.LUA_TNUMINT].indexOf(key.type) > -1) {
key = key.value;
}
}
if (typeof key === 'number') {
return table.value.array[key];
} else {
return table.value.hash.get(key);
}
},
__len: function (table) {
return t.value.array.length;
}
};
}
}
module.exports = {
LClosure: LClosure,
TValue: TValue,
Table: Table
};
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