compiler.js

let fs = require('fs');
let simas = require('./simas');
let common = require('./common');

// Compiled Simple Assembly
const compiledFileExtension = ".csa";

if(!process.argv[2]) {
    process.stderr.write("Error: Please provide an input file to compile.\nUse the flag -h for help.\n");
    process.exit(1);
}

if (process.argv[2] == "-h") {
    process.stdout.write(common.compiler_information);
} else {
    try {
        var ins = "";
        fs.readFile(process.argv[2], 'utf8', function (err, data) {
            if (err) {
                process.stderr.write("Error opening file: " + err.path + "\n");
                process.exit(1);
            }
            ins = JSON.stringify(simas.run(data, false, process.argv[2], []), null, 0); // last argument could be 4

            let target;
            if (process.argv[2]) {
                target = process.argv[2].replace(/\.[^/.]+$/, compiledFileExtension);
            }
        
            fs.writeFile(target, common.xString(ins), 'utf8', (err) => {
                if (err) {
                    process.stderr.write('Error compiling to file:' + err.path + "\n");
                    return;
                }
        
                process.stdout.write('Compiled file: ' + process.argv[2] + ' to ' + target);
            }); 
        });

    } catch(err) {
        console.log("Something went wrong.");
    }
}