@adrianepi/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>", "file where the output is going to be stored", "output.js")
    .option("-p, --pattern <pattern>", "other parameters (--js | -j) for only store the js output and (--ast | -a) for only storing the ast")
    .action((filename, options) => {
        transpile(filename, options.output, options.pattern);
    });

program.parse(process.argv);

/**
 * A function that takes two file names and a pattern and parses the js code
 * into an AST or js code.
 *
 * @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 etc.
 * @param      {string}  [pattern=""]  The pattern
 * @private
 */
function transpile(input_file, output_file, pattern = "") {
    let program = fs.readFileSync(input_file, 'utf8', (err, input) => {
        if (err) {
            console.log("Couldn't read the file: " + err);
            return;
        }
    });
    console.log("File read succesfully");
    let output = constantFolding(program, pattern);
    fs.writeFile(output_file, output, (err) => {
            if (err) {
                console.log("Couldn't write the output to " + output_file + ": " + err);
                return;
            }
            console.log("Output written succesfully in " + output_file);
    });
}