Here is an example directly from the official website:
function PhoneListCtrl ($scope, $http) {
$http.get('phones/phones.json').success(function(data) {
$scope.phones = data;
});
$scope.orderProp = 'age';
}
The $scope and $http parameters are specific identifiers used to access corresponding AngularJS services within the DI (Dependency Injection) system. How does the DI system precisely locate the variable name for these arguments?
This is a condensed version of a method
var FN_ARGS = /^function\s*[^\(]*\(\s*([^\)]*)\)/m;
var FN_ARG_SPLIT = /,/;
var FN_ARG = /^\s*(_?)(\S+?)\1\s*$/;
var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
function annotate(fn){
var $inject
if (!($inject = fn.$inject)) {
$inject = [];
fnText = fn.toString().replace(STRIP_COMMENTS, '');
argDecl = fnText.match(FN_ARGS);
angular.forEach(argDecl[1].split(FN_ARG_SPLIT), function(arg){
arg.replace(FN_ARG, function(all, underscore, name){
$inject.push(name);
});
});
fn.$inject = $inject;
}
return fn.$inject;
}
Demo: Fiddle(View the console for output);
Steps:
1. Use `toString` to fetch the source of the function
2. Eliminate comments with regex
3. Parse and retrieve arguments from the function's source
Directly from the official @GitHub page:
The most basic method is to retrieve the dependencies from the arguments of the function. This involves converting the function into a string using the
toString()method and then extracting the argument names.// Example function MyController($scope, $route) { // ... } // Outcome expect(injector.annotate(MyController)).toEqual(['$scope', '$route']);
Concerning the annotate function
function annotate(fn) {
var $inject,
fnText,
argDecl,
last;
if (typeof fn == 'function') {
if (!($inject = fn.$inject)) {
$inject = [];
fnText = fn.toString().replace(STRIP_COMMENTS, '');
argDecl = fnText.match(FN_ARGS);
forEach(argDecl[1].split(FN_ARG_SPLIT), function(arg){
arg.replace(FN_ARG, function(all, underscore, name){
$inject.push(name);
});
});
fn.$inject = $inject;
}
} else if (isArray(fn)) {
last = fn.length - 1;
assertArgFn(fn[last], 'fn')
$inject = fn.slice(0, last);
} else {
assertArgFn(fn, 'fn', true);
}
return $inject;
}
found on line 45 onwards
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