/* */ 
var console = require("console");
var untilde = function(str) {
  return str.replace(/~./g, function(m) {
    switch (m) {
      case "~0":
        return "~";
      case "~1":
        return "/";
    }
    throw ("Invalid tilde escape: " + m);
  });
};
var traverse = function(obj, pointer, value) {
  var part = untilde(pointer.shift());
  if (typeof obj[part] === "undefined") {
    throw ("Value for pointer '" + pointer + "' not found.");
    return ;
  }
  if (pointer.length !== 0) {
    return traverse(obj[part], pointer, value);
  }
  if (typeof value === "undefined") {
    return obj[part];
  }
  var old_value = obj[part];
  if (value === null) {
    delete obj[part];
  } else {
    obj[part] = value;
  }
  return old_value;
};
var validate_input = function(obj, pointer) {
  if (typeof obj !== "object") {
    throw ("Invalid input object.");
  }
  if (pointer === "") {
    return [];
  }
  if (!pointer) {
    throw ("Invalid JSON pointer.");
  }
  pointer = pointer.split("/");
  var first = pointer.shift();
  if (first !== "") {
    throw ("Invalid JSON pointer.");
  }
  return pointer;
};
var get = function(obj, pointer) {
  pointer = validate_input(obj, pointer);
  if (pointer.length === 0) {
    return obj;
  }
  return traverse(obj, pointer);
};
var set = function(obj, pointer, value) {
  pointer = validate_input(obj, pointer);
  if (pointer.length === 0) {
    throw ("Invalid JSON pointer for set.");
  }
  return traverse(obj, pointer, value);
};
exports.get = get;
exports.set = set;
