Converts all JavaScript object bracket selectors with JavaScript object dot notation within file

objectDotNotation.js

'use strict';

// may result in mixed object notation if a [var] || [fn] value is used within a object notation > 2 levels
// also will result in mixed object notation if a non-converting ["k-e-y"] is nested (e.g. [][]) with a converting ["key"].
// Run with ES6 compatible runtime (recent Node or Babel) `node objectDotNotation.js file.js outFile.js` or
// `const dotIt = require('objectDotNotation')
// dotIt('file.js','outFile.js');
const fs = require('fs'),
	file = process.argv[2],
	outFile = process.argv[3];

var changeToDots = (file, outFile) => {

	
	return fs.readFile(file, 'utf8', function(err, doc){
		let outString = '' + doc[0],
			startKey = -1,
			line = 1;
		console.log("Reading file...");
		console.log("Converting keys...");
		console.log(doc);
		for(var i=1; i<doc.length; i++){
			if( doc[i] === '[' && doc[i-1] !== ']' && startKey < 0){
				if(doc[i+1] === '"' || doc[i+1] === "'"){					
					startKey = i+2;
				} else {
					outString += doc[i];
				}
			} else if( startKey >= 0) {
				if ( doc[i] === '-' ) {
					outString += doc.substr(startKey - 2, i - startKey + 1);
					startKey = -1;
				} else if ( doc[i] === ']' ){
					if ( doc[i+1] = '[' && ( doc[i+2] !== '"' || doc[i+2] !== "'" ){
						outString += doc.substr(startKey - 2, i - startKey + 1);
					} else {
						outString += '.' + doc.substr(startKey, i - startKey - 1);
					}
					startKey = -1;
				} else if ( /\s/.test(doc[i]) ){
					console.log("Exception at line " + line + '. Illegal space character in middle of key.');
					break;
				} else if ( i === doc.length -1 ){
					console.log('Exception at line ' + line + '. Document ended before key finished.');
					break;
				}
			} else {
				outString += doc[i];
			};

			if ( /\n/.test(doc[i]) ) line++;
		}

		console.log("Writing new file...");

		fs.writeFile(outFile, outString, function(err){
			if (err) console.log(err);
			console.log(outFile + ' created with fancy new dot notations for those lovely object keys!');
		});
	});


}
module.exports = changeToDots;
changeToDots(file, outFile);