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2-injector.html
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<!DOCTYPE html>
<html ng-app="plunker">
<head>
<meta charset="utf-8"/>
<title>AngularJS Injector</title>
<script src="ngsrc/minErr.js"></script>
<script src="ngsrc/Angular.js"></script>
<script src="ngsrc/apis.js"></script>
<script src="ngsrc/auto/injector.js"></script>
</head>
<body>
<script>
function createInjector(modulesToLoad) {
var INSTANTIATING = {},
providerSuffix = 'Provider',
path = [],
loadedModules = new HashMap(),
providerCache = {
$provide: {
provider: supportObject(provider),
factory: supportObject(factory),
service: supportObject(service),
value: supportObject(value),
constant: supportObject(constant),
decorator: decorator
}
},
providerInjector = (providerCache.$injector =
createInternalInjector(providerCache, function() {
throw $injectorMinErr('unpr', "Unknown provider: {0}", path.join(' <- '));
})),
instanceCache = {},
instanceInjector = (instanceCache.$injector =
createInternalInjector(instanceCache, function(servicename) {
var provider = providerInjector.get(servicename + providerSuffix);
return instanceInjector.invoke(provider.$get, provider);
}));
forEach(loadModules(modulesToLoad), function(fn) { instanceInjector.invoke(fn || noop); });
// chylvina: I change this to test providerInjector
return {'providerInjector':providerInjector,'instanceInjector':instanceInjector};
////////////////////////////////////
// $provider
////////////////////////////////////
function supportObject(delegate) {
return function(key, value) {
if (isObject(key)) {
forEach(key, reverseParams(delegate));
} else {
return delegate(key, value);
}
};
}
function provider(name, provider_) {
assertNotHasOwnProperty(name, 'service');
// chylvina: here is an chance to inject provider
// we can treat provider as classes and use their api as class's static method
// refer to: $CompileProvider (angular.js # line 5280)
if (isFunction(provider_) || isArray(provider_)) {
provider_ = providerInjector.instantiate(provider_);
}
// chylvina: $get is required
if (!provider_.$get) {
throw $injectorMinErr('pget', "Provider '{0}' must define $get factory method.", name);
}
return providerCache[name + providerSuffix] = provider_;
}
function factory(name, factoryFn) { return provider(name, { $get: factoryFn }); }
function service(name, constructor) {
return factory(name, ['$injector', function($injector) {
return $injector.instantiate(constructor);
}]);
}
function value(name, val) { return factory(name, valueFn(val)); }
function constant(name, value) {
assertNotHasOwnProperty(name, 'constant');
providerCache[name] = value;
instanceCache[name] = value;
}
function decorator(serviceName, decorFn) {
var origProvider = providerInjector.get(serviceName + providerSuffix),
orig$get = origProvider.$get;
origProvider.$get = function() {
var origInstance = instanceInjector.invoke(orig$get, origProvider);
return instanceInjector.invoke(decorFn, null, {$delegate: origInstance});
};
}
////////////////////////////////////
// Module Loading
////////////////////////////////////
function loadModules(modulesToLoad){
var runBlocks = [], moduleFn, invokeQueue, i, ii;
forEach(modulesToLoad, function(module) {
if (loadedModules.get(module)) return;
loadedModules.put(module, true);
try {
if (isString(module)) {
moduleFn = angularModule(module);
runBlocks = runBlocks.concat(loadModules(moduleFn.requires)).concat(moduleFn._runBlocks);
for(invokeQueue = moduleFn._invokeQueue, i = 0, ii = invokeQueue.length; i < ii; i++) {
var invokeArgs = invokeQueue[i],
provider = providerInjector.get(invokeArgs[0]);
provider[invokeArgs[1]].apply(provider, invokeArgs[2]);
}
} else if (isFunction(module)) {
runBlocks.push(providerInjector.invoke(module));
} else if (isArray(module)) {
runBlocks.push(providerInjector.invoke(module));
} else {
assertArgFn(module, 'module');
}
} catch (e) {
if (isArray(module)) {
module = module[module.length - 1];
}
if (e.message && e.stack && e.stack.indexOf(e.message) == -1) {
// Safari & FF's stack traces don't contain error.message content
// unlike those of Chrome and IE
// So if stack doesn't contain message, we create a new string that contains both.
// Since error.stack is read-only in Safari, I'm overriding e and not e.stack here.
/* jshint -W022 */
e = e.message + '\n' + e.stack;
}
throw $injectorMinErr('modulerr', "Failed to instantiate module {0} due to:\n{1}",
module, e.stack || e.message || e);
}
});
return runBlocks;
}
////////////////////////////////////
// internal Injector
////////////////////////////////////
function createInternalInjector(cache, factory) {
function getService(serviceName) {
if (cache.hasOwnProperty(serviceName)) {
if (cache[serviceName] === INSTANTIATING) {
throw $injectorMinErr('cdep', 'Circular dependency found: {0}', path.join(' <- '));
}
// the instance is cached, so a service is a singleton
return cache[serviceName];
} else {
try {
path.unshift(serviceName);
cache[serviceName] = INSTANTIATING;
// chylvian:
// 1. instanceInjector.get('$rootScope')
// 2. factory('$rootScope')
// 3. providerInjector.get('$rootScopeProvider')
// 4. instanceInjector.cache['$rootScope'] = the $rootScope instance
return cache[serviceName] = factory(serviceName);
} catch (err) {
if (cache[serviceName] === INSTANTIATING) {
delete cache[serviceName];
}
throw err;
} finally {
path.shift();
}
}
}
function invoke(fn, self, locals){
var args = [],
$inject = annotate(fn),
length, i,
key;
for(i = 0, length = $inject.length; i < length; i++) {
key = $inject[i];
if (typeof key !== 'string') {
throw $injectorMinErr('itkn',
'Incorrect injection token! Expected service name as string, got {0}', key);
}
args.push(
locals && locals.hasOwnProperty(key)
? locals[key]
: getService(key)
);
}
if (!fn.$inject) {
// this means that we must be an array.
fn = fn[length];
}
// http://jsperf.com/angularjs-invoke-apply-vs-switch
// #5388
return fn.apply(self, args);
}
function instantiate(Type, locals) {
var Constructor = function() {},
instance, returnedValue;
// Check if Type is annotated and use just the given function at n-1 as parameter
// e.g. someModule.factory('greeter', ['$window', function(renamed$window) {}]);
Constructor.prototype = (isArray(Type) ? Type[Type.length - 1] : Type).prototype;
instance = new Constructor();
// chylvina: if Type returned something, use it, then it is same as invoke.
// chylvina: else use instance
returnedValue = invoke(Type, instance, locals);
return isObject(returnedValue) || isFunction(returnedValue) ? returnedValue : instance;
}
return {
invoke: invoke,
instantiate: instantiate,
get: getService,
annotate: annotate,
has: function(name) {
return providerCache.hasOwnProperty(name + providerSuffix) || cache.hasOwnProperty(name);
}
};
}
}
var res = createInjector();
var providerInjector = res.providerInjector;
var instanceInjector = res.instanceInjector;
providerInjector.invoke(['$provide', function($provide) {
$provide.value('a', 'hello');
$provide.provider('b', function() {
return {
$get: function() {
var s = {};
s.name = 'factory';
s.test = function() {
console.log(s.name);
};
return s;
}}
});
$provide.factory('c', function() {
var s = {};
s.name = 'factory';
s.test = function() {
console.log(s.name);
};
return s;
});
$provide.service('d', function() {
this.name = 'service';
this.test = function() {
console.log(this.name);
};
});
}]);
console.log(providerInjector.get('aProvider'));
console.log(providerInjector.get('bProvider'));
console.log(providerInjector.get('cProvider'));
console.log(providerInjector.get('dProvider'));
providerInjector.invoke(['aProvider', function(a) {
console.log(a);
console.log(providerInjector.invoke(a.$get));
}]);
providerInjector.invoke(['bProvider', function(b) {
console.log(b);
}]);
instanceInjector.invoke(['a', function(a) {
console.log(a);
}]);
instanceInjector.invoke(['$provide', function($provide) {
$provide.value('a', 'hello');
$provide.provider('b', function() {
return {
$get: function() {
var s = {};
s.name = 'factory';
s.test = function() {
console.log(s.name);
};
return s;
}}
});
$provide.factory('c', function() {
var s = {};
s.name = 'factory';
s.test = function() {
console.log(s.name);
};
return s;
});
$provide.service('d', function() {
this.name = 'service';
this.test = function() {
console.log(this.name);
};
});
}]);
instanceInjector.invoke(['a', function(a) {
console.log(a);
}]);
instanceInjector.invoke(['b', function(b) {
}]);
</script>
</body>
</html>