Javascript parser for STRIPS PDDL grammar parser from pegjs.org. This code parses the result of the pegjs grammar produced from the file grammar.txt https://gist.github.com/primaryobjects/22363e71112d716ea183 and returns a JSON object with the action operators, conditions, and effects.

parser.js

/*
grammar.txt: saved from https://gist.github.com/primaryobjects/22363e71112d716ea183
domain.txt:
(define (domain random-domain)
  (:requirements :strips :typing)
  (:action op1
    :parameters (?x1 ?x2 ?x3)
    :precondition (and (S ?x1 ?x2) (R ?x3 ?x1))
    :effect (and (S ?x2 ?x1) (S ?x1 ?x3) (not (R ?x3 ?x1))))
  (:action op2
    :parameters (?x1 ?x2 ?x3)
    :precondition (and (S ?x3 ?x1) (R ?x2 ?x2))
    :effect (and (S ?x1 ?x3) (not (S ?x3 ?x1)))))
*/
 
var fs = require('fs');
var PEG = require("pegjs");
var util = require('util');
 
fs.readFile('grammar.txt', 'utf8', function(err, grammar) {
    if (err) throw err;
 
    var parser = PEG.buildParser(grammar);
 
    fs.readFile('domain.txt', 'utf8', function(err, domain) {
        if (err) throw err;
 
        var result = parser.parse(domain);
	console.log(JSON.stringify(result));
    });
});