Hartquist

hartquist.js

// include uglify library
var jsp = require("uglify-js").parser;
var pro = require("uglify-js").uglify;

// returns a sorted list of variable references
function parseVariables(code) {
   var ast = jsp.parse(code, false, false);
   var w = pro.ast_walker();
   var vars = [];

   // this is called when a variable reference is found
   function recordVar() {
      vars.push(this[1]);
   }

   // walk the tree 
   w.with_walkers({
      "name"    : recordVar
   }, 
   function() {
      return w.walk(ast);
   });

   return vars.sort();
}

// Check command line args 
if (process.argv.length < 3) {
   console.log("Usage: node " + process.argv[1] + ' FILENAME');
   process.exit(1);
}   

// read file, display results
var fs = require('fs')
  , filename = process.argv[2];
fs.readFile(filename, 'utf8', function(err, data) {
   console.log(parseVariables(data));
});