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/*jshint esversion: 6 */
"use strict";
const assert = require('assert');
class Proto {
constructor(L) {
this.k = []; // constants used by the function
this.p = []; // functions defined inside the function
this.code = []; // opcodes
this.cache = null; // last-created closure with this prototype
this.lineinfo = []; // map from opcodes to source lines (debug information)
this.upvalues = []; // upvalue information
this.numparams = 0; // number of fixed parameters
this.is_vararg = 0;
this.maxstacksize = 0; // number of registers needed by this function
this.locvars = []; // information about local variables (debug information)
this.linedefined = 0; // debug information
this.lastlinedefined = 0; // debug information
this.source = null; // used for debug information
}
}
class UpVal {
constructor(L) {
this.L = L; // Keep track of the thread it comes from
this.v = null; /* if null, upval is closed, value is in u.value */
this.u = {
open: { /* (when open) */
next: null, /* linked list */
touched: false /* mark to avoid cycles with dead threads */
},
value: null /* the value (when closed) */
};
}
val(L) {
return this.v !== null ? L.stack[this.v] : this.u.value;
}
setval(L, ra) {
if (this.v !== null) {
this.L.stack[this.v] = L.stack[ra];
this.v = ra;
} else this.u.value = L.stack[ra];
}
isopen() {
return this.v !== null;
}
}
const findupval = function(L, level) {
let pp = L.openupval;
while(pp !== null && pp.v >= level) {
let p = pp;
if (p.v === level)
return p;
pp = p.u.open.next;
}
let uv = new UpVal(L);
uv.refcount = 0;
uv.u.open.next = pp;
uv.u.open.touched = true;
pp = uv;
uv.v = level;
// Thread with upvalue list business ? lfunc.c:75
return uv;
};
const luaF_close = function(L, level) {
while (L.openupval !== null && L.openupval.v >= level) {
let uv = L.openupval;
assert(uv.isopen());
L.openupval = uv.u.open.next; /* remove from 'open' list */
if (uv.refcount > 0) {
uv.value = L.stack[uv.v];
uv.v = null;
}
}
};
const luaF_initupvals = function(L, cl) {
for (let i = 0; i < cl.nupvalues; i++) {
let uv = new UpVal(L);
uv.refcount = 1;
uv.u.value = null;
uv.v = uv.u.value;
}
};
/*
** Look for n-th local variable at line 'line' in function 'func'.
** Returns null if not found.
*/
const luaF_getlocalname = function(f, local_number, pc) {
for (let i = 0; i < f.locvars.length && f.locvars[i].startpc <= pc; i++) {
if (pc < f.locvars[i].endpc) { /* is variable active? */
local_number--;
if (local_number == 0)
return f.locvars[i].varname;
}
}
return null; /* not found */
}
module.exports.Proto = Proto;
module.exports.UpVal = UpVal;
module.exports.findupval = findupval;
module.exports.luaF_close = luaF_close;
module.exports.MAXUPVAL = 255;
module.exports.luaF_initupvals = luaF_initupvals;
module.exports.luaF_getlocalname = luaF_getlocalname
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