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Factorio BluePrint String Parser in NodeJS
var input = `H4sIAAAAAAAA/42R0WrDMAxFfyX0OYImg74Uf0vxbK0V2HImOWHD5N/ndKOsacn2FAjn5lzd+NSE5G
xoTqYgZ8qEakphG9HsrCrG10B8hmjdhRih37VD0oolNuXDwEv7afbz3P4kNFrJQKwoGWXFdle29STo
ri8Pt1xIZ9JMDtwFNcNQzTQhDJIm8usP7e+df7dclYzoaYyAodaQ6hxSwPvA0hS6/531cFV/i71Z3R
yjex5bjSH4PtbnsxV+VdxwPagONUYu8fKniT0uyMaW1fFN9ZvUPB8F8yjcnI7I/gvQdo5aWgIAAA==`;
var crypto = require("crypto");
var zlib = require("zlib");
var LuaVMJS = require('lua.vm.js');
// create our luaVM for re-use
var luaVM = new LuaVMJS.Lua.State();
// load our modified JSON lib that pushes JSON to global scope
luaVM.execute(require("fs").readFileSync(__dirname + "/json.lua", "utf-8"));
function Decode(str) {
return new Promise(function(resolve, reject) {
zlib.unzip(Buffer.from(str, 'base64'), (err, buffer) => {
if (!err) {
return resolve(buffer.toString());
} else {
// handle error
reject(err);
}
});
});
}
function Parse(str) {
return new Promise(function(resolve, reject) {
// create variable name we want lua to inject into
var injectVar = "factorio_bp_" + RandomString(64);
// turn Blueprint string into a function
// TODO - OMG HOW DO I CHECK THIS IS SAFE TO DO???
luaVM.execute(`
function export_bp_${injectVar}()
${str}
end`);
// inject LUA table as JSON into JS global variable
luaVM.execute(`
js.global.${injectVar} = JSON:encode(export_bp_${injectVar}())
`);
// return a JSON parsed version of the injected string
resolve(JSON.parse(global[injectVar]));
// remove export_bp_${injectvar} function
luaVM.execute(`
export_bp_${injectVar} = nil
`);
// delete from the JS global scope too to clear up memory
delete global[injectVar];
});
}
// generate a random string for lua->js variable injection
function RandomString(len)
{
return crypto.randomBytes(len).toString('hex');
}
Decode(input).then(Parse).then(function(data) {
console.log(JSON.stringify(data, null, 2));
}, console.error);
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