js303/assets/javascripts/htmlbars/loader.js

var define, requireModule, require, requirejs;

(function() {

  var _isArray;
  if (!Array.isArray) {
    _isArray = function (x) {
      return Object.prototype.toString.call(x) === "[object Array]";
    };
  } else {
    _isArray = Array.isArray;
  }

  var registry = {}, seen = {};
  var FAILED = false;

  var uuid = 0;

  function tryFinally(tryable, finalizer) {
    try {
      return tryable();
    } finally {
      finalizer();
    }
  }


  function Module(name, deps, callback, exports) {
    var defaultDeps = ['require', 'exports', 'module'];

    this.id       = uuid++;
    this.name     = name;
    this.deps     = !deps.length && callback.length ? defaultDeps : deps;
    this.exports  = exports || { };
    this.callback = callback;
    this.state    = undefined;
  }

  define = function(name, deps, callback) {
    if (!_isArray(deps)) {
      callback = deps;
      deps     =  [];
    }

    registry[name] = new Module(name, deps, callback);
  };

  define.amd = {};

  function reify(mod, name, seen) {
    var deps = mod.deps;
    var length = deps.length;
    var reified = new Array(length);
    var dep;
    // TODO: new Module
    // TODO: seen refactor
    var module = { };

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

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

  requirejs = require = requireModule = function(name) {
    var mod = registry[name];
    if (!mod) {
      throw new Error('Could not find module ' + name);
    }

    if (mod.state !== FAILED &&
        seen.hasOwnProperty(name)) {
      return seen[name];
    }

    var reified;
    var module;
    var loaded = false;

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

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

    if (module === undefined && reified.module.exports) {
      return (seen[name] = reified.module.exports);
    } else {
      return (seen[name] = module);
    }
  };

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

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