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function Scope(initialState, name) {
this.widgets = [];
this.evals = [];
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;
}
this.set('$watch', bind(this, this.addWatchListener));
this.set('$eval', bind(this, this.addEval));
};
Scope.expressionCache = {};
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 bind(lastInstance, instance);
}
return instance;
};
Scope.prototype = {
updateView: function() {
var self = this;
this.fireWatchers();
foreach(this.widgets, function(widget){
self.evalWidget(widget, "", {}, function(){
this.updateView(self);
});
});
foreach(this.evals, bind(this, this.apply));
},
addWidget: function(controller) {
if (controller) this.widgets.push(controller);
},
addEval: function(fn, listener) {
// todo: this should take a function/string and a listener
this.evals.push(fn);
},
isProperty: function(exp) {
for ( var i = 0; i < exp.length; i++) {
var ch = exp.charAt(i);
if (ch!='.' && !Lexer.prototype.isIdent(ch)) {
return false;
}
}
return true;
},
get: function(path) {
// log('SCOPE.get', path, Scope.getter(this.state, path));
return Scope.getter(this.state, path);
},
set: function(path, value) {
// log('SCOPE.set', 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;
},
setEval: function(expressionText, value) {
this.eval(expressionText + "=" + toJson(value));
},
eval: function(expressionText, context) {
// log('Scope.eval', expressionText);
var expression = Scope.expressionCache[expressionText];
if (!expression) {
var parser = new Parser(expressionText);
expression = parser.statements();
parser.assertAllConsumed();
Scope.expressionCache[expressionText] = expression;
}
context = context || {};
context.scope = this;
context.self = this.state;
return expression(context);
},
//TODO: Refactor. This function needs to be an execution closure for widgets
// move to widgets
// remove expression, just have inner closure.
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){
var jsonError = toJson(e, true);
error('Eval Widget Error:', jsonError);
widget.hasError = true;
jQuery(widget.view).
addClass('ng-exception').
attr('ng-error', jsonError);
if (onFailure) {
onFailure.apply(widget, [e, jsonError]);
}
return false;
}
},
validate: function(expressionText, value, element) {
var expression = Scope.expressionCache[expressionText];
if (!expression) {
expression = new Parser(expressionText).validator();
Scope.expressionCache[expressionText] = expression;
}
var self = {scope:this, self:this.state, '$element':element};
return expression(self)(self, value);
},
entity: function(entityDeclaration, datastore) {
var expression = new Parser(entityDeclaration).entityDeclaration();
return expression({scope:this, datastore:datastore});
},
clearInvalid: function() {
var invalid = this.state['$invalidWidgets'];
while(invalid.length > 0) {invalid.pop();}
},
markInvalid: function(widget) {
this.state['$invalidWidgets'].push(widget);
},
watch: function(declaration) {
var self = this;
new Parser(declaration).watch()({
scope:this,
addListener:function(watch, exp){
self.addWatchListener(watch, function(n,o){
try {
return exp({scope:self}, n, o);
} catch(e) {
alert(e);
}
});
}
});
},
addWatchListener: function(watchExpression, listener) {
var watcher = this.watchListeners[watchExpression];
if (!watcher) {
watcher = {listeners:[], expression:watchExpression};
this.watchListeners[watchExpression] = watcher;
}
watcher.listeners.push(listener);
},
fireWatchers: function() {
var self = this, fired = false;
foreach(this.watchListeners, function(watcher) {
var value = self.eval(watcher.expression);
if (value !== watcher.lastValue) {
foreach(watcher.listeners, function(listener){
listener(value, watcher.lastValue);
fired = true;
});
watcher.lastValue = value;
}
});
return fired;
},
apply: function(fn) {
fn.apply(this.state, slice.call(arguments, 1, arguments.length));
}
};
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