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/*jshint esversion: 6 */
"use strict";
const assert = require('assert');
const lua = require('./lua.js');
const lobject = require('./lobject.js');
const ldo = require('./ldo.js');
const lapi = require('./lapi.js');
const luaT_init = require('./ltm.js').luaT_init;
const CT = lua.constant_types;
const LUA_MULTRET = lua.LUA_MULTRET;
const TS = lua.thread_status;
const LUA_NUMTAGS = lua.LUA_NUMTAGS;
const BASIC_STACK_SIZE = 2 * lua.LUA_MINSTACK;
class CallInfo {
constructor(funcOff, func, top, base, previous, next) {
this.func = func;
this.funcOff = funcOff;
this.top = top;
this.previous = previous;
this.next = next;
this.pcOff = 0;
this.u = {
l: { /* only for Lua functions */
base: base, /* base for this function */
savedpc: []
},
c: { /* only for JS functions */
k: null, /* continuation in case of yields */
old_errfunc: null,
ctx: null /* context info. in case of yields */
}
};
this.nresults = 0;
this.callstatus = 0;
}
}
class lua_State extends lobject.TValue {
constructor() {
super(CT.LUA_TTHREAD, null);
this.base_ci = new CallInfo(); // Will be populated later
this.top = 0;
this.ci = null;
this.ciOff = null;
this.stack = [];
this.openupval = [];
this.status = TS.LUA_OK;
this.next = null;
this.twups = [this];
this.errorJmp = null;
this.nny = 1;
this.errfunc = 0;
this.value = this;
}
}
class global_State {
constructor(L) {
this.mainthread = L;
this.strt = new Map();
this.l_registry = new lobject.TValue(CT.LUA_TNIL, null);
this.panic = null;
this.version = null;
this.twups = [];
this.mt = new Array(LUA_NUMTAGS);
}
intern(stringArray) {
// TODO: when weak value maps are available
// let key = stringArray.map(e => `${e}|`).join('');
// if (!this.strt.has(key))
// this.strt.set(key, new lobject.TValue(CT.LUA_TLNGSTR, stringArray));
// return this.strt.get(key);
return new lobject.TValue(CT.LUA_TLNGSTR, stringArray);
}
}
const stack_init = function(L1, L) {
L1.stack = new Array(BASIC_STACK_SIZE); // TODO: for now we don't care about the stack size
L1.top = 0;
let ci = L1.base_ci;
ci.next = ci.previous = null;
ci.callstatus = 0;
ci.func = L1.stack[L1.top];
ci.funcOff = L1.top;
L1.stack[L1.top++] = new lobject.TValue(CT.LUA_TNIL, null);
ci.top = L1.top + lua.LUA_MINSTACK;
L1.ci = ci;
};
/*
** Create registry table and its predefined values
*/
const init_registry = function(L, g) {
let registry = new lobject.Table();
g.l_registry = registry;
registry.value.set(lua.LUA_RIDX_MAINTHREAD - 1, L);
registry.value.set(lua.LUA_RIDX_GLOBALS - 1, new lobject.Table());
};
/*
** open parts of the state that may cause memory-allocation errors.
** ('g->version' !== NULL flags that the state was completely build)
*/
const f_luaopen = function(L) {
let g = L.l_G;
stack_init(L, L);
init_registry(L, g);
luaT_init(L);
g.version = lapi.lua_version(null);
};
const preinit_thread = function(L, g) {
L.l_G = g;
L.stack = [];
L.ci = null;
L.nci = 0;
L.twups = [L]; /* thread has no upvalues */
L.errorJmp = null;
L.nCcalls = 0;
L.hook = null;
L.hookmask = 0;
L.basehookcount = 0;
L.allowhook = 1;
L.hookcount = L.basehookcount;
L.openupval = [];
L.nny = 1;
L.status = TS.LUA_OK;
L.errfunc = 0;
};
const lua_newthread = function(L) {
let g = L.l_G;
let L1 = new lua_State();
L.stack[L.top++] = L1;
assert(L.top <= L.ci.top, "stack overflow");
preinit_thread(L1, g);
L1.hookmask = L.hookmask;
L1.basehookcount = L.basehookcount;
L1.hook = L.hook;
L1.hookcount = L1.basehookcount;
stack_init(L1, L);
return L1;
};
const lua_newstate = function() {
let L = new lua_State();
let g = new global_State(L);
preinit_thread(L, g);
if (ldo.luaD_rawrunprotected(L, f_luaopen, null) !== TS.LUA_OK) {
L = null;
}
return L;
};
module.exports.lua_State = lua_State;
module.exports.CallInfo = CallInfo;
module.exports.CIST_OAH = (1<<0); /* original value of 'allowhook' */
module.exports.CIST_LUA = (1<<1); /* call is running a Lua function */
module.exports.CIST_HOOKED = (1<<2); /* call is running a debug hook */
module.exports.CIST_FRESH = (1<<3); /* call is running on a fresh invocation of luaV_execute */
module.exports.CIST_YPCALL = (1<<4); /* call is a yieldable protected call */
module.exports.CIST_TAIL = (1<<5); /* call was tail called */
module.exports.CIST_HOOKYIELD = (1<<6); /* last hook called yielded */
module.exports.CIST_LEQ = (1<<7); /* using __lt for __le */
module.exports.CIST_FIN = (1<<8); /* call is running a finalizer */
module.exports.lua_newstate = lua_newstate;
module.exports.lua_newthread = lua_newthread;
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