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"use strict";
const defs = require('./defs.js');
const CT = defs.constant_types;
const LUAC_DATA = "\x19\x93\r\n\x1a\n";
const LUAC_INT = 0x5678;
const LUAC_NUM = 370.5;
const LUAC_VERSION = Number.parseInt(defs.LUA_VERSION_MAJOR) * 16 + Number.parseInt(defs.LUA_VERSION_MINOR);
const LUAC_FORMAT = 0; /* this is the official format */
class DumpState {
constructor() {
this.L = null;
this.write = null;
this.data = null;
this.strip = NaN;
this.status = NaN;
}
}
const DumpBlock = function(b, size, D) {
if (D.status === 0 && size > 0)
D.status = D.writer(D.L, b, size, D.data);
};
const DumpLiteral = function(s, D) {
s = defs.to_luastring(s);
DumpBlock(s, s.length, D);
};
const DumpByte = function(y, D) {
DumpBlock([y], 1, D);
};
const DumpInt = function(x, D) {
let dv = new DataView(new ArrayBuffer(4));
dv.setInt32(0, x, true);
let t = [];
for (let i = 0; i < 4; i++)
t.push(dv.getUint8(i, true));
DumpBlock(t, 4, D);
};
const DumpInteger = function(x, D) {
let dv = new DataView(new ArrayBuffer(4));
dv.setInt32(0, x, true);
let t = [];
for (let i = 0; i < 4; i++)
t.push(dv.getUint8(i, true));
DumpBlock(t, 8, D);
};
const DumpNumber = function(x, D) {
let dv = new DataView(new ArrayBuffer(8));
dv.setFloat64(0, x, true);
let t = [];
for (let i = 0; i < 8; i++)
t.push(dv.getUint8(i, true));
DumpBlock(t, 8, D);
};
const DumpString = function(s, D) {
if (s === null)
DumpByte(0, D);
else {
let size = s.length + 1;
let str = s;
if (size < 0xFF)
DumpByte(size, D);
else {
DumpByte(0xFF, D);
DumpInteger(size, D);
}
DumpBlock(str, size - 1, D); /* no need to save '\0' */
}
};
const DumpCode = function(f, D) {
let s = f.code.map(e => e.code);
DumpInt(s.length, D);
for (let i = 0; i < s.length; i++)
DumpInt(s[i], D);
};
const DumpConstants = function(f, D) {
let n = f.k.length;
DumpInt(n, D);
for (let i = 0; i < n; i++) {
let o = f.k[i];
DumpByte(o.ttype(), D);
switch (o.ttype()) {
case CT.LUA_TNIL:
break;
case CT.LUA_TBOOLEAN:
DumpByte(o.value ? 1 : 0, D);
break;
case CT.LUA_TNUMFLT:
DumpNumber(o.value, D);
break;
case CT.LUA_TNUMINT:
DumpInteger(o.value, D);
break;
case CT.LUA_TSHRSTR:
case CT.LUA_TLNGSTR:
DumpString(o.value, D);
break;
}
}
};
const DumpProtos = function(f, D) {
let n = f.p.length;
DumpInt(n, D);
for (let i = 0; i < n; i++)
DumpFunction(f.p[i], f.source, D);
};
const DumpUpvalues = function(f, D) {
let n = f.upvalues.length;
DumpInt(n, D);
for (let i = 0; i < n; i++) {
DumpByte(f.upvalues[i].instack ? 1 : 0, D);
DumpByte(f.upvalues[i].idx, D);
}
};
const DumpDebug = function(f, D) {
let n = D.strip ? 0 : f.lineinfo.length;
DumpInt(n, D);
for (let i = 0; i < n; i++)
DumpInt(f.lineinfo[i], D);
n = D.strip ? 0 : f.locvars.length;
DumpInt(n, D);
for (let i = 0; i < n; i++) {
DumpString(f.locvars[i].varname, D);
DumpInt(f.locvars[i].startpc, D);
DumpInt(f.locvars[i].endpc, D);
}
n = D.strip ? 0 : f.upvalues.length;
DumpInt(n, D);
for (let i = 0; i < n; i++)
DumpString(f.upvalues[i].name, D);
};
const DumpFunction = function(f, psource, D) {
if (D.strip || f.source === psource)
DumpString(null, D); /* no debug info or same source as its parent */
else
DumpString(f.source, D);
DumpInt(f.linedefined, D);
DumpInt(f.lastlinedefined, D);
DumpByte(f.numparams, D);
DumpByte(f.is_vararg, D);
DumpByte(f.maxstacksize, D);
DumpCode(f, D);
DumpConstants(f, D);
DumpUpvalues(f, D);
DumpProtos(f, D);
DumpDebug(f, D);
};
const DumpHeader = function(D) {
DumpLiteral(defs.LUA_SIGNATURE, D);
DumpByte(LUAC_VERSION, D);
DumpByte(LUAC_FORMAT, D);
let cdata = LUAC_DATA.split('').map(e => e.charCodeAt(0));
DumpBlock(cdata, cdata.length, D);
DumpByte(4, D); // intSize
DumpByte(8, D); // size_tSize
DumpByte(4, D); // instructionSize
DumpByte(4, D); // integerSize
DumpByte(8, D); // numberSize
DumpInteger(LUAC_INT, D);
DumpNumber(LUAC_NUM, D);
};
/*
** dump Lua function as precompiled chunk
*/
const luaU_dump = function(L, f, w, data, strip) {
let D = new DumpState();
D.L = L;
D.writer = w;
D.data = data;
D.strip = strip;
D.status = 0;
DumpHeader(D);
DumpByte(f.upvalues.length, D);
DumpFunction(f, null, D);
return D.status;
};
module.exports.luaU_dump = luaU_dump;
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