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'use strict';
function getter(instance, path, unboundFn) {
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]*$/))
throw "Expression '" + path + "' is not a valid expression for accessing variables.";
if (instance) {
lastInstance = instance;
instance = instance[key];
}
if (isUndefined(instance) && key.charAt(0) == '$') {
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(lastInstance, fn, lastInstance);
return instance;
}
}
}
if (!unboundFn && isFunction(instance)) {
return bind(lastInstance, instance);
}
return instance;
}
function setter(instance, path, value){
var element = path.split('.');
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;
}
///////////////////////////////////
var scopeId = 0,
getterFnCache = {},
compileCache = {},
JS_KEYWORDS = {};
forEach(
("abstract,boolean,break,byte,case,catch,char,class,const,continue,debugger,default," +
"delete,do,double,else,enum,export,extends,false,final,finally,float,for,function,goto," +
"if,implements,import,ininstanceof,intinterface,long,native,new,null,package,private," +
"protected,public,return,short,static,super,switch,synchronized,this,throw,throws," +
"transient,true,try,typeof,var,volatile,void,undefined,while,with").split(/,/),
function(key){ JS_KEYWORDS[key] = true;}
);
function getterFn(path){
var fn = getterFnCache[path];
if (fn) return fn;
var code = 'var l, fn, t;\n';
forEach(path.split('.'), function(key) {
key = (JS_KEYWORDS[key]) ? '["' + key + '"]' : '.' + key;
code += 'if(!s) return s;\n' +
'l=s;\n' +
's=s' + key + ';\n' +
'if(typeof s=="function" && !(s instanceof RegExp)) s = function(){ return l'+key+'.apply(l, arguments); };\n';
if (key.charAt(1) == '$') {
// special code for super-imposed functions
var name = key.substr(2);
code += 'if(!s) {\n' +
' t = angular.Global.typeOf(l);\n' +
' fn = (angular[t.charAt(0).toUpperCase() + t.substring(1)]||{})["' + name + '"];\n' +
' if (fn) s = function(){ return fn.apply(l, [l].concat(Array.prototype.slice.call(arguments, 0, arguments.length))); };\n' +
'}\n';
}
});
code += 'return s;';
fn = Function('s', code);
fn["toString"] = function(){ return code; };
return getterFnCache[path] = fn;
}
///////////////////////////////////
function expressionCompile(exp){
if (typeof exp === $function) return exp;
var fn = compileCache[exp];
if (!fn) {
var p = parser(exp);
var fnSelf = p.statements();
fn = compileCache[exp] = extend(
function(){ return fnSelf(this);},
{fnSelf: fnSelf});
}
return fn;
}
function errorHandlerFor(element, error) {
elementError(element, NG_EXCEPTION, isDefined(error) ? formatError(error) : error);
}
/**
* @workInProgress
* @ngdoc overview
* @name angular.scope
*
* @description
* Scope is a JavaScript object and the execution context for expressions. You can think about
* scopes as JavaScript objects that have extra APIs for registering watchers. A scope is the
* context in which model (from the model-view-controller design pattern) exists.
*
* Angular scope objects provide the following methods:
*
* * {@link angular.scope.$become $become()} -
* * {@link angular.scope.$bind $bind()} -
* * {@link angular.scope.$eval $eval()} -
* * {@link angular.scope.$get $get()} -
* * {@link angular.scope.$new $new()} -
* * {@link angular.scope.$onEval $onEval()} -
* * {@link angular.scope.$service $service()} -
* * {@link angular.scope.$set $set()} -
* * {@link angular.scope.$tryEval $tryEval()} -
* * {@link angular.scope.$watch $watch()} -
*
* For more information about how angular scope objects work, see {@link guide/dev_guide.scopes
* Angular Scope Objects} in the angular Developer Guide.
*/
function createScope(parent, providers, instanceCache) {
function Parent(){}
parent = Parent.prototype = (parent || {});
var instance = new Parent();
var evalLists = {sorted:[]};
var $log, $exceptionHandler;
extend(instance, {
'this': instance,
$id: (scopeId++),
$parent: parent,
/**
* @workInProgress
* @ngdoc function
* @name angular.scope.$bind
* @function
*
* @description
* Binds a function `fn` to the current scope. See: {@link angular.bind}.
<pre>
var scope = angular.scope();
var fn = scope.$bind(function(){
return this;
});
expect(fn()).toEqual(scope);
</pre>
*
* @param {function()} fn Function to be bound.
*/
$bind: bind(instance, bind, instance),
/**
* @workInProgress
* @ngdoc function
* @name angular.scope.$get
* @function
*
* @description
* Returns the value for `property_chain` on the current scope. Unlike in JavaScript, if there
* are any `undefined` intermediary properties, `undefined` is returned instead of throwing an
* exception.
*
<pre>
var scope = angular.scope();
expect(scope.$get('person.name')).toEqual(undefined);
scope.person = {};
expect(scope.$get('person.name')).toEqual(undefined);
scope.person.name = 'misko';
expect(scope.$get('person.name')).toEqual('misko');
</pre>
*
* @param {string} property_chain String representing name of a scope property. Optionally
* properties can be chained with `.` (dot), e.g. `'person.name.first'`
* @returns {*} Value for the (nested) property.
*/
$get: bind(instance, getter, instance),
/**
* @workInProgress
* @ngdoc function
* @name angular.scope.$set
* @function
*
* @description
* Assigns a value to a property of the current scope specified via `property_chain`. Unlike in
* JavaScript, if there are any `undefined` intermediary properties, empty objects are created
* and assigned to them instead of throwing an exception.
*
<pre>
var scope = angular.scope();
expect(scope.person).toEqual(undefined);
scope.$set('person.name', 'misko');
expect(scope.person).toEqual({name:'misko'});
expect(scope.person.name).toEqual('misko');
</pre>
*
* @param {string} property_chain String representing name of a scope property. Optionally
* properties can be chained with `.` (dot), e.g. `'person.name.first'`
* @param {*} value Value to assign to the scope property.
*/
$set: bind(instance, setter, instance),
/**
* @workInProgress
* @ngdoc function
* @name angular.scope.$eval
* @function
*
* @description
* Without the `exp` parameter triggers an eval cycle for this scope and its child scopes.
*
* With the `exp` parameter, compiles the expression to a function and calls it with `this` set
* to the current scope and returns the result. In other words, evaluates `exp` as angular
* expression in the context of the current scope.
*
* # Example
<pre>
var scope = angular.scope();
scope.a = 1;
scope.b = 2;
expect(scope.$eval('a+b')).toEqual(3);
expect(scope.$eval(function(){ return this.a + this.b; })).toEqual(3);
scope.$onEval('sum = a+b');
expect(scope.sum).toEqual(undefined);
scope.$eval();
expect(scope.sum).toEqual(3);
</pre>
*
* @param {(string|function())=} exp An angular expression to be compiled to a function or a js
* function.
*
* @returns {*} The result of calling compiled `exp` with `this` set to the current scope.
*/
$eval: function(exp) {
var type = typeof exp;
var i, iSize;
var j, jSize;
var queue;
var fn;
if (type == $undefined) {
for ( i = 0, iSize = evalLists.sorted.length; i < iSize; i++) {
for ( queue = evalLists.sorted[i],
jSize = queue.length,
j= 0; j < jSize; j++) {
instance.$tryEval(queue[j].fn, queue[j].handler);
}
}
} else if (type === $function) {
return exp.call(instance);
} else if (type === 'string') {
return expressionCompile(exp).call(instance);
}
},
/**
* @workInProgress
* @ngdoc function
* @name angular.scope.$tryEval
* @function
*
* @description
* Evaluates the expression in the context of the current scope just like
* {@link angular.scope.$eval} with expression parameter, but also wraps it in a try/catch
* block.
*
* If an exception is thrown then `exceptionHandler` is used to handle the exception.
*
* # Example
<pre>
var scope = angular.scope();
scope.error = function(){ throw 'myerror'; };
scope.$exceptionHandler = function(e) {this.lastException = e; };
expect(scope.$eval('error()'));
expect(scope.lastException).toEqual('myerror');
this.lastException = null;
expect(scope.$eval('error()'), function(e) {this.lastException = e; });
expect(scope.lastException).toEqual('myerror');
var body = angular.element(window.document.body);
expect(scope.$eval('error()'), body);
expect(body.attr('ng-exception')).toEqual('"myerror"');
expect(body.hasClass('ng-exception')).toEqual(true);
</pre>
*
* @param {string|function()} expression Angular expression to evaluate.
* @param {(function()|DOMElement)=} exceptionHandler Function to be called or DOMElement to be
* decorated.
* @returns {*} The result of `expression` evaluation.
*/
$tryEval: function (expression, exceptionHandler) {
var type = typeof expression;
try {
if (type == $function) {
return expression.call(instance);
} else if (type == 'string'){
return expressionCompile(expression).call(instance);
}
} catch (e) {
if ($log) $log.error(e);
if (isFunction(exceptionHandler)) {
exceptionHandler(e);
} else if (exceptionHandler) {
errorHandlerFor(exceptionHandler, e);
} else if (isFunction($exceptionHandler)) {
$exceptionHandler(e);
}
}
},
/**
* @workInProgress
* @ngdoc function
* @name angular.scope.$watch
* @function
*
* @description
* Registers `listener` as a callback to be executed every time the `watchExp` changes. Be aware
* that the callback gets, by default, called upon registration, this can be prevented via the
* `initRun` parameter.
*
* # Example
<pre>
var scope = angular.scope();
scope.name = 'misko';
scope.counter = 0;
expect(scope.counter).toEqual(0);
scope.$watch('name', 'counter = counter + 1');
expect(scope.counter).toEqual(1);
scope.$eval();
expect(scope.counter).toEqual(1);
scope.name = 'adam';
scope.$eval();
expect(scope.counter).toEqual(2);
</pre>
*
* @param {function()|string} watchExp Expression that should be evaluated and checked for
* change during each eval cycle. Can be an angular string expression or a function.
* @param {function()|string} listener Function (or angular string expression) that gets called
* every time the value of the `watchExp` changes. The function will be called with two
* parameters, `newValue` and `oldValue`.
* @param {(function()|DOMElement)=} [exceptionHanlder=angular.service.$exceptionHandler] Handler
* that gets called when `watchExp` or `listener` throws an exception. If a DOMElement is
* specified as a handler, the element gets decorated by angular with the information about the
* exception.
* @param {boolean=} [initRun=true] Flag that prevents the first execution of the listener upon
* registration.
*
*/
$watch: function(watchExp, listener, exceptionHandler, initRun) {
var watch = expressionCompile(watchExp),
last = watch.call(instance);
listener = expressionCompile(listener);
function watcher(firstRun){
var value = watch.call(instance),
// we have to save the value because listener can call ourselves => inf loop
lastValue = last;
if (firstRun || lastValue !== value) {
last = value;
instance.$tryEval(function(){
return listener.call(instance, value, lastValue);
}, exceptionHandler);
}
}
instance.$onEval(PRIORITY_WATCH, watcher);
if (isUndefined(initRun)) initRun = true;
if (initRun) watcher(true);
},
/**
* @workInProgress
* @ngdoc function
* @name angular.scope.$onEval
* @function
*
* @description
* Evaluates the `expr` expression in the context of the current scope during each
* {@link angular.scope.$eval eval cycle}.
*
* # Example
<pre>
var scope = angular.scope();
scope.counter = 0;
scope.$onEval('counter = counter + 1');
expect(scope.counter).toEqual(0);
scope.$eval();
expect(scope.counter).toEqual(1);
</pre>
*
* @param {number} [priority=0] Execution priority. Lower priority numbers get executed first.
* @param {string|function()} expr Angular expression or function to be executed.
* @param {(function()|DOMElement)=} [exceptionHandler=angular.service.$exceptionHandler] Handler
* function to call or DOM element to decorate when an exception occurs.
*
*/
$onEval: function(priority, expr, exceptionHandler){
if (!isNumber(priority)) {
exceptionHandler = expr;
expr = priority;
priority = 0;
}
var evalList = evalLists[priority];
if (!evalList) {
evalList = evalLists[priority] = [];
evalList.priority = priority;
evalLists.sorted.push(evalList);
evalLists.sorted.sort(function(a,b){return a.priority-b.priority;});
}
evalList.push({
fn: expressionCompile(expr),
handler: exceptionHandler
});
},
/**
* @workInProgress
* @ngdoc function
* @name angular.scope.$become
* @function
* @deprecated This method will be removed before 1.0
*
* @description
* Modifies the scope to act like an instance of the given class by:
*
* - copying the class's prototype methods
* - applying the class's initialization function to the scope instance (without using the new
* operator)
*
* That makes the scope be a `this` for the given class's methods — effectively an instance of
* the given class with additional (scope) stuff. A scope can later `$become` another class.
*
* `$become` gets used to make the current scope act like an instance of a controller class.
* This allows for use of a controller class in two ways.
*
* - as an ordinary JavaScript class for standalone testing, instantiated using the new
* operator, with no attached view.
* - as a controller for an angular model stored in a scope, "instantiated" by
* `scope.$become(ControllerClass)`.
*
* Either way, the controller's methods refer to the model variables like `this.name`. When
* stored in a scope, the model supports data binding. When bound to a view, {{name}} in the
* HTML template refers to the same variable.
*/
$become: function(Class) {
if (isFunction(Class)) {
instance.constructor = Class;
forEach(Class.prototype, function(fn, name){
instance[name] = bind(instance, fn);
});
instance.$service.invoke(instance, Class, slice.call(arguments, 1, arguments.length));
//TODO: backwards compatibility hack, remove when we don't depend on init methods
if (isFunction(Class.prototype.init)) {
instance.init();
}
}
},
/**
* @workInProgress
* @ngdoc function
* @name angular.scope.$new
* @function
*
* @description
* Creates a new {@link angular.scope scope}, that:
*
* - is a child of the current scope
* - will {@link angular.scope.$become $become} of type specified via `constructor`
*
* @param {function()} constructor Constructor function of the type the new scope should assume.
* @returns {Object} The newly created child scope.
*
*/
$new: function(constructor) {
var child = createScope(instance);
child.$become.apply(instance, concat([constructor], arguments, 1));
instance.$onEval(child.$eval);
return child;
}
});
if (!parent.$root) {
instance.$root = instance;
instance.$parent = instance;
/**
* @workInProgress
* @ngdoc function
* @name angular.scope.$service
* @function
*
* @description
* Provides access to angular's dependency injector and
* {@link angular.service registered services}. In general the use of this api is discouraged,
* except for tests and components that currently don't support dependency injection (widgets,
* filters, etc).
*
* @param {string} serviceId String ID of the service to return.
* @returns {*} Value, object or function returned by the service factory function if any.
*/
(instance.$service = createInjector(instance, providers, instanceCache)).eager();
}
$log = instance.$service('$log');
$exceptionHandler = instance.$service('$exceptionHandler');
return instance;
}