agson/lib/agson/Traversal.js

Querying and manipulating JSON graphs

(function() {
  var Lens, Maybe, Store, Traversal, maybeMap,
    __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; },
    __hasProp = {}.hasOwnProperty,
    __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };

  Maybe = require('data.maybe');

  maybeMap = require('./util').maybeMap;

  Store = require('./Store');

  Lens = require('./Lens');

  module.exports = Traversal = (function(_super) {
    __extends(Traversal, _super);

    function Traversal() {
      this.then = __bind(this.then, this);
      return Traversal.__super__.constructor.apply(this, arguments);
    }

    Traversal.of = function(description, fs) {
      return new ((function(_super1) {
        __extends(_Class, _super1);

        function _Class() {
          return _Class.__super__.constructor.apply(this, arguments);
        }

        _Class.prototype.runM = function(mt) {
          return Store.of(Maybe)(fs(mt));
        };

        _Class.prototype.toString = function() {
          return description;
        };

        return _Class;

      })(Traversal));
    };

    Traversal.prototype.then = function(bc) {
      return Traversal.of("" + (this.toString()) + ".then(" + (bc.toString()) + ")", (function(_this) {
        return function(ma) {
          return {
            modify: function(f) {
              return _this.runM(ma).modify(function(mb) {
                return bc.runM(mb).modify(f);
              });
            },
            get: function() {
              return _this.runM(ma).get().map(function(bs) {
                return maybeMap(bs, function(b) {
                  return bc.run(b).get();
                });
              });
            }
          };
        };
      })(this));
    };

    return Traversal;

  })(Lens);

}).call(this);