var define, requireModule, require, requirejs, hasModule;

(function() {
  var registry = {}, seen = {}, state = {};
  var FAILED = false;

  define = function(name, deps, callback) {
    registry[name] = {
      deps: deps,
      callback: callback
    };
  };

  function reify(deps, name, seen) {
    var length = deps.length;
    var reified = new Array(length);
    var dep;
    var exports;

    for (var i = 0, l = length; i < l; i++) {
      dep = deps[i];
      if (dep === 'exports') {
        exports = reified[i] = seen;
      } else {
        reified[i] = require(resolve(dep, name));
      }
    }

    return {
      deps: reified,
      exports: exports
    };
  }

  hasModule = function(name){
    return !!registry[name];
  };

  requirejs = require = requireModule = function(name) {
    if (state[name] !== FAILED &&
        seen.hasOwnProperty(name)) {
      return seen[name];
    }

    if (!registry[name]) {
      throw new Error('Could not find module ' + name);
    }

    var mod = registry[name];
    var reified;
    var module;
    var loaded = false;

    seen[name] = { }; // placeholder for run-time cycles

    try {
      reified = reify(mod.deps, name, seen[name]);
      module = mod.callback.apply(this, reified.deps);
      loaded = true;
    } finally {
      if (!loaded) {
        state[name] = FAILED;
      }
    }

    return reified.exports ? seen[name] : (seen[name] = module);
  };

  function resolve(child, name) {
    if (child.charAt(0) !== '.') { return child; }

    var parts = child.split('/');
    var nameParts = name.split('/');
    var parentBase;

    if (nameParts.length === 1) {
      parentBase = nameParts;
    } else {
      parentBase = nameParts.slice(0, -1);
    }

    for (var i = 0, l = parts.length; i < l; i++) {
      var part = parts[i];

      if (part === '..') { parentBase.pop(); }
      else if (part === '.') { continue; }
      else { parentBase.push(part); }
    }

    return parentBase.join('/');
  }

  requirejs.entries = requirejs._eak_seen = registry;
  requirejs.clear = function(){
    requirejs.entries = requirejs._eak_seen = registry = {};
    seen = state = {};
  };
})();