compromise.js

var nlp = require('compromise')

function parseCommand (input) {
  var doc = nlp(input)

  var cmd = doc.verbs().out('array');
  var objects = doc.nouns().out('array');

  console.log(cmd);
  console.log(objects);
}

parseCommand(look)
// =>  [ 'look' ]
// =>  []

parseCommand(look at your butt)
// =>  [ 'look' ]
// =>  [ 'your butt' ]

parseCommand(look at your butt inside the table)
// =>  [ 'look' ]
// =>  [ 'your butt', 'table' ]

parseCommand(look at your butt on top of the table)
// =>  [ 'look' ]
// =>  [ 'your butt', 'table' ]

parseCommand(take key)
// =>  [ 'take' ]
// =>  [ 'key' ]

parseCommand(take key from the table)
// =>  [ 'take' ]
// =>  [ 'key', 'table' ]

parseCommand(take key from the box)
// =>  [ 'take' ]
// =>  [ 'key', 'box' ]

parseCommand(take key from the box on the table)
// =>  [ 'take' ]
// =>  [ 'key', 'box', 'table' ]