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bundler.js
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bundler.js
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#!/usr/bin/env node
const path = require('path');
const fs = require('fs');
const Module = require('module');
const beautify = require('js-beautify').js_beautify;
const zip = require('node-zip')();
const topFile = fs.readFileSync(path.resolve(__dirname, 'templates', 'top.txt'), 'utf8');
const botFile = fs.readFileSync(path.resolve(__dirname, 'templates', 'bottom.txt'), 'utf8');
const REGEX_REQ_G = /require\(['|"|`](.*)['|"|`]\)/g;
const REGEX_REQ = /require\(['|"|`](.*)['|"|`]\)/;
const REGEX_RFSYNC_G = /readFileSync\(['|"|`](.*)['|"|`]\)/g;
const REGEX_RFSYNC = /readFileSync\(['|"|`](.*)['|"|`]\)/;
const REGEX_RFASYNC_G = /readFileP\(['|"](.*)['|"]\)/g;
const REGEX_RFASYNC = /readFileP\(['|"](.*)['|"]\)/;
var a = '1';
class Bundler {
constructor(options){
this._scopes = {};
this.inputFile = options.inputFile;
this.minify = options.minify;
this.beautify = options.beautify;
this.outputFile = options.outputFile || 'bundle.js';
this.ignoreFiles = options.ignoreFiles || [];
this.disableJSON = options.disableJSON || false;
this.debug = options.verbose ? (...args) => console.log(...args) : () => null;
this.zip = options.zip || false;
}
static scopeFileJS(string, main){
return `${ string }\n\t${main ? `\n\t AppExport = module;` : ''}`;
}
static scopeFileJSON(string){
return `module.exports = ${ string }`;
}
static generateScopeFile(scope, string){
let file = ''
if(scope.endsWith('.json')) file = Bundler.scopeFileJSON(string);
else file = Bundler.scopeFileJS(string, scope === './app.js');
return Module.wrap(file);
}
static fixPath(filePath, requirePath){
filePath = path.normalize(filePath);
if(!requirePath.endsWith('.js') && !requirePath.endsWith('.json')) requirePath += '.js'
let fixedPath = path.join(path.parse(filePath).dir, requirePath);
fixedPath = (('./'+fixedPath).replace(/\\/g, '/'));
return fixedPath;
}
static findRequires(file){
const requires = file.match(REGEX_REQ_G)
return !requires ? [] : file.match(REGEX_REQ_G).map((string) => string.match(REGEX_REQ)[1]);
}
processFile(filePath, entry){
if(this._scopes[filePath]) return;
if(this.ignoreFiles.includes(filePath) || (filePath.includes('.json') && this.disableJSON)) {
return;
}
this.debug(`Processing ${filePath}`);
const file = String(fs.readFileSync(filePath, 'utf-8'));
const fileRequires = Bundler.findRequires(file);
if(entry) {
const parsedPath = path.parse(filePath);
// Use absolute path in case of different paths between input and output
this.outputFile = path.resolve(process.cwd(), this.outputFile);
this.ignoreFiles = this.ignoreFiles.map((fpath) => '.'+fpath.replace(new RegExp(parsedPath.dir), ''));
filePath = parsedPath.base;
process.chdir(parsedPath.dir);
}
if(!filePath.startsWith('./')) filePath = './'+filePath;
this._scopes[filePath] = file;
fileRequires.forEach((requirePath) => {
// File is requiring module from node_modules
if(!requirePath.startsWith('./') && !requirePath.startsWith('../')) return;
// File Path relative to root dir
const fixedPath = Bundler.fixPath(filePath, requirePath);
this.processFile(fixedPath);
})
return;
}
concatScopes(){
return Object.entries(this._scopes).map(([scope, string]) => {
this.debug(`Adding ${scope} to bundle`);
return (`__scopes["${scope}"] = function(){ return ${Bundler.generateScopeFile(scope, string)} }`)
}).join(';\n\n');;
};
getBundle(pre, after){
return pre +
'\n\n' +
this.init() +
'\n\n' +
`__scope('init', (exports, require, module) => {
require('./${path.parse(this.inputFile).base}')
});`+
after;
}
init(){
console.log(`Processing Files...`)
this.processFile(this.inputFile, true);
console.log(`Bundling Files...`)
return this.concatScopes();
}
saveFile(){
console.log(`Saving File...`);
let bundle = this.getBundle(topFile, botFile)
let encoding = 'utf-8'
if(this.beautify) bundle = beautify(bundle, { indent_size: 4 });
if(this.zip){
const assets = {}
const scopes = this._scopes;
function readDir(folder){
let dir = [];
try {
dir = fs.readdirSync(folder);
} catch(err){
if(!err.message.includes('not a directory, scandir')) throw err;
}
dir.forEach((el) => {
el = folder+'/'+el;
if(el.endsWith('.log') || el.includes('testing') || el.includes('dist')) return;
if(!el.slice(2).includes('.')) return readDir(el);
if(Object.keys(scopes).includes(el)) return;
assets[el] = fs.readFileSync(el, 'utf-8');
});
}
readDir('.');
zip.file(path.parse(this.outputFile).base, bundle);
Object.entries(assets).forEach(([fpath, ftext]) => zip.file(fpath.replace(/\.\//, ''), ftext));
encoding = 'binary';
bundle = zip.generate({base64:false,compression:'DEFLATE'});
this.outputFile += '.zip';
}
fs.writeFileSync(this.outputFile, bundle, encoding);
console.log(`Saved file ${this.outputFile}!`);
process.exit(0)
}
}
module.exports = Bundler;