glass-platform/www/glass/patch.js

Glass platform

(function(){require.register('glass/patch',function(module,exports,require){// Generated by CoffeeScript 1.6.2
(function() {
  var apply, assert, canWatch, combine, exports, watch;

  require('./global');

  apply = function(target, values, deleteUndefined) {
    var key, patchedValue, value;

    if (deleteUndefined == null) {
      deleteUndefined = true;
    }
    if ((values != null ? values.constructor : void 0) !== Object) {
      return Object.clone(values, true);
    }
    if ((target != null ? target.constructor : void 0) !== Object) {
      target = {};
    }
    for (key in values) {
      value = values[key];
      patchedValue = apply(target[key], value, deleteUndefined);
      if (value === void 0 && deleteUndefined) {
        delete target[key];
      } else {
        target[key] = patchedValue;
      }
    }
    return target;
  };

  combine = function(patch1, patch2) {
    return apply(patch1, patch2, false);
  };

  canWatch = function(object) {
    return (object != null) && typeof object === 'object';
  };

  watch = function(object, handler, callInitial) {
    var pendingPatch, processPatch, subWatchers, watcher;

    if (callInitial == null) {
      callInitial = true;
    }
    if (!canWatch(object)) {
      throw new Error("Cannot watch: " + object);
    }
    subWatchers = {};
    pendingPatch = null;
    processPatch = function(patchValues) {
      var name, value;

      for (name in patchValues) {
        if (typeof subWatchers[name] === "function") {
          subWatchers[name]();
        }
        value = object[name];
        if (canWatch(value)) {
          (function() {
            var saveName, subHandler;

            saveName = name;
            subHandler = function(patch) {
              var basePatch;

              basePatch = {};
              basePatch[saveName] = patch;
              if (pendingPatch != null) {
                return pendingPatch = combine(pendingPatch, basePatch);
              } else {
                return handler(basePatch);
              }
            };
            return subWatchers[saveName] = watch(value, subHandler, false);
          })();
        }
      }
    };
    watcher = function(changes) {
      var change, _i, _len;

      pendingPatch = {};
      for (_i = 0, _len = changes.length; _i < _len; _i++) {
        change = changes[_i];
        pendingPatch[change.name] = object[change.name];
      }
      processPatch(pendingPatch);
      return process.nextTick(function() {
        handler(pendingPatch);
        return pendingPatch = null;
      });
    };
    processPatch(object);
    Object.observe(object, watcher);
    return function() {
      var key, value, _results;

      Object.unobserve(object, watcher);
      _results = [];
      for (key in subWatchers) {
        value = subWatchers[key];
        _results.push(value());
      }
      return _results;
    };
  };

  module.exports = exports = {
    apply: apply,
    combine: combine,
    watch: watch
  };

  if (typeof describe === 'function') {
    assert = require('assert');
    describe('glass.patch', function() {
      return it('should work', function(done) {
        var source, target, unwatch;

        source = {
          name: 'Kris',
          age: 41,
          children: {
            Sadera: {
              grandchildren: {
                One: 1,
                Two: 2
              }
            },
            Orion: {}
          }
        };
        target = Object.clone(source);
        unwatch = watch(source, function(patch) {
          target = apply(target, patch);
          assert(Object.equal(source, target));
          done();
          return unwatch();
        });
        source.name = 'Fred';
        source.children.Orion = {
          a: 1,
          b: 2
        };
        source.children.Orion.c = 12;
        return source.children.Sadera.grandchildren.three = 3;
      });
    });
  }

}).call(this);

/*
//@ sourceMappingURL=patch.map
*/

})})()