1 files changed, 198 insertions, 0 deletions
diff --git a/src/Scope.js b/src/Scope.js
new file mode 100644
index 00000000..45dd15a4
--- /dev/null
+++ b/src/Scope.js
@@ -0,0 +1,198 @@
+// Copyright (C) 2009 BRAT Tech LLC
+
+nglr.Scope = function(initialState, name) {
+  this.widgets = [];
+  this.watchListeners = {};
+  this.name = name;
+  initialState = initialState || {};
+  var State = function(){};
+  State.prototype = initialState;
+  this.state = new State();
+  this.state.$parent = initialState;
+  if (name == "ROOT") {
+    this.state.$root = this.state;
+  }
+};
+
+nglr.Scope.expressionCache = {};
+
+nglr.Scope.prototype.updateView = function() {
+  var self = this;
+  this.fireWatchers();
+  _.each(this.widgets, function(widget){
+    self.evalWidget(widget, "", {}, function(){
+      this.updateView(self);
+    });
+  });
+};
+
+nglr.Scope.prototype.addWidget = function(controller) {
+  if (controller) this.widgets.push(controller);
+};
+
+nglr.Scope.prototype.isProperty = function(exp) {
+  for ( var i = 0; i < exp.length; i++) {
+    var ch = exp.charAt(i);
+    if (ch!='.'  && !nglr.Lexer.prototype.isIdent(ch)) {
+      return false;
+    }
+  }
+  return true;
+};
+
+nglr.Scope.getter = function(instance, path) {
+  if (!path) return instance;
+  var element = path.split('.');
+  var key;
+  var lastInstance = instance;
+  var len = element.length;
+  for ( var i = 0; i < len; i++) {
+    key = element[i];
+    if (!key.match(/^[\$\w][\$\w\d]*$/))
+        throw "Expression '" + path + "' is not a valid expression for accesing variables.";
+    if (instance) {
+      lastInstance = instance;
+      instance = instance[key];
+    }
+    if (_.isUndefined(instance)  && key.charAt(0) == '$') {
+      var type = angular.Global.typeOf(lastInstance);
+      type = angular[type.charAt(0).toUpperCase()+type.substring(1)];
+      var fn = type ? type[[key.substring(1)]] : undefined;
+      if (fn) {
+        instance = _.bind(fn, lastInstance, lastInstance);
+        return instance;
+      }
+    }
+  }
+  if (typeof instance === 'function' && !instance.$$factory) {
+    return nglr.bind(lastInstance, instance);
+  }
+  return instance;
+};
+
+nglr.Scope.prototype.get = function(path) {
+  return nglr.Scope.getter(this.state, path);
+};
+
+nglr.Scope.prototype.set = function(path, value) {
+  var element = path.split('.');
+  var instance = this.state;
+  for ( var i = 0; element.length > 1; i++) {
+    var key = element.shift();
+    var newInstance = instance[key];
+    if (!newInstance) {
+      newInstance = {};
+      instance[key] = newInstance;
+    }
+    instance = newInstance;
+  }
+  instance[element.shift()] = value;
+  return value;
+};
+
+nglr.Scope.prototype.setEval = function(expressionText, value) {
+  this.eval(expressionText + "=" + nglr.toJson(value));
+};
+
+nglr.Scope.prototype.eval = function(expressionText, context) {
+  var expression = nglr.Scope.expressionCache[expressionText];
+  if (!expression) {
+    var parser = new nglr.Parser(expressionText);
+    expression = parser.statements();
+    parser.assertAllConsumed();
+    nglr.Scope.expressionCache[expressionText] = expression;
+  }
+  context = context || {};
+  context.scope = this;
+  return expression(context);
+};
+
+//TODO: Refactor. This function needs to be an execution closure for widgets
+// move to widgets
+// remove expression, just have inner closure.
+nglr.Scope.prototype.evalWidget = function(widget, expression, context, onSuccess, onFailure) {
+  try {
+    var value = this.eval(expression, context);
+    if (widget.hasError) {
+      widget.hasError = false;
+      jQuery(widget.view).
+        removeClass('ng-exception').
+        removeAttr('ng-error');
+    }
+    if (onSuccess) {
+      value = onSuccess.apply(widget, [value]);
+    }
+    return true;
+  } catch (e){
+    console.error('Eval Widget Error:', e);
+    var jsonError = nglr.toJson(e, true);
+    widget.hasError = true;
+    jQuery(widget.view).
+      addClass('ng-exception').
+      attr('ng-error', jsonError);
+    if (onFailure) {
+      onFailure.apply(widget, [e, jsonError]);
+    }
+    return false;
+  }
+};
+
+nglr.Scope.prototype.validate = function(expressionText, value) {
+  var expression = nglr.Scope.expressionCache[expressionText];
+  if (!expression) {
+    expression = new nglr.Parser(expressionText).validator();
+    nglr.Scope.expressionCache[expressionText] = expression;
+  }
+  var self = {scope:this};
+  return expression(self)(self, value);
+};
+
+nglr.Scope.prototype.entity = function(entityDeclaration) {
+  var expression = new nglr.Parser(entityDeclaration).entityDeclaration();
+  return expression({scope:this});
+};
+
+nglr.Scope.prototype.markInvalid = function(widget) {
+  this.state.$invalidWidgets.push(widget);
+};
+
+nglr.Scope.prototype.watch = function(declaration) {
+  var self = this;
+  new nglr.Parser(declaration).watch()({
+    scope:this,
+    addListener:function(watch, exp){
+      self.addWatchListener(watch, function(n,o){
+        try {
+          return exp({scope:self}, n, o);
+        } catch(e) {
+          nglr.alert(e);
+        }
+      });
+    }
+  });
+};
+
+nglr.Scope.prototype.addWatchListener = function(watchExpression, listener) {
+  var watcher = this.watchListeners[watchExpression];
+  if (!watcher) {
+    watcher = {listeners:[], expression:watchExpression};
+    this.watchListeners[watchExpression] = watcher;
+  }
+  watcher.listeners.push(listener);
+};
+
+nglr.Scope.prototype.fireWatchers = function() {
+  var self = this;
+  var fired = false;
+  jQuery.each(this.watchListeners, function(name, watcher) {
+    var value = self.eval(watcher.expression);
+    if (value !== watcher.lastValue) {
+      jQuery.each(watcher.listeners, function(i, listener){
+        listener(value, watcher.lastValue);
+        fired = true;
+      });
+      watcher.lastValue = value;
+    }
+  });
+  return fired;
+};