Creel

creel.js

/* A little error checking for input file */
if (process.argv.length < 3) {
	throw new Error('Usage: node vars.js <example.js>');
}

/* variables and whatnot */
var parse = require('./parse-js.js');
var fs = require('fs');
var varList = [];
var getVars = function getVars(elm) {
	for (var i = 0; i < elm[1].length; i++) {
		varList.push(elm[1][i][0]);
	}
};

/* Reads JS from the file and prints out a list of variables. */
fs.readFile(process.argv[2], function(err,data) {
	if(err) {
    	console.error("Could not open file: %s", err);
    	process.exit(1);
  	}

	var tree = parse.parse(data.toString('ascii'));
	
	var mapfn = function mapfn(elm) {
		if (Array.isArray(elm)) {
			if (elm[0] == 'var') {
				getVars(elm);
			}
			elm.map(mapfn);
		}
	};
	tree.map(mapfn);
	console.log(varList);
	console.log(varList.length);
});