@alu0101350158/constant-folding/bin/constant-folding-cli.js

Constant Folding javascript code

#!/usr/bin/env node
const {program} = require('commander');
const fs = require('fs');
const {version, description} = require('../package.json');
const constantFolding = require('../src/constant-folding'); // Your libs

"use strict";

program
    .version(version)
    .name('constant folding')
    .arguments("<filename>")
    .description(description, {
        filename: 'file with the original code'
    })
    .option("-o, --output <filename>", "description 1", "output.js")
    .action((filename, options) => {
        if (options.output === undefined) {
            transpile(filename);
        } else {
            transpile(filename, options.output);
        }
    });

program.parse(process.argv);

/**
 * A function that takes two file names and applies
 *  constant folding to the js code present in the first
 *  file and outputs the result in the second one.
 * @param {string} input_file The file from which to read the code
 * @param {string} output_file The file to which to write the code with the logs
 *
 * @private
 */
function transpile(input_file, output_file = null) {
    let code = fs.readFileSync(input_file, 'utf8');
    let result = constantFolding(code);
    if (output_file !== null) {
        fs.writeFileSync(output_file, result);
    } else {
        console.log(result);
    }
}