/**
 * @internalapi
 * @module vanilla
 */
/** */
import { extend, assertPredicate, isFunction, isArray, isInjectable, } from '../common/index';
// globally available injectables
var globals = {};
var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/gm;
var ARGUMENT_NAMES = /([^\s,]+)/g;
/**
 * A basic angular1-like injector api
 *
 * This object implements four methods similar to the
 * [angular 1 dependency injector](https://docs.angularjs.org/api/auto/service/$injector)
 *
 * UI-Router evolved from an angular 1 library to a framework agnostic library.
 * However, some of the `@uirouter/core` code uses these ng1 style APIs to support ng1 style dependency injection.
 *
 * This object provides a naive implementation of a globally scoped dependency injection system.
 * It supports the following DI approaches:
 *
 * ### Function parameter names
 *
 * A function's `.toString()` is called, and the parameter names are parsed.
 * This only works when the parameter names aren't "mangled" by a minifier such as UglifyJS.
 *
 * ```js
 * function injectedFunction(FooService, BarService) {
 *   // FooService and BarService are injected
 * }
 * ```
 *
 * ### Function annotation
 *
 * A function may be annotated with an array of dependency names as the `$inject` property.
 *
 * ```js
 * injectedFunction.$inject = [ 'FooService', 'BarService' ];
 * function injectedFunction(fs, bs) {
 *   // FooService and BarService are injected as fs and bs parameters
 * }
 * ```
 *
 * ### Array notation
 *
 * An array provides the names of the dependencies to inject (as strings).
 * The function is the last element of the array.
 *
 * ```js
 * [ 'FooService', 'BarService', function (fs, bs) {
 *   // FooService and BarService are injected as fs and bs parameters
 * }]
 * ```
 *
 * @type {$InjectorLike}
 */
export var $injector = {
    /** Gets an object from DI based on a string token */
    get: function (name) { return globals[name]; },
    /** Returns true if an object named `name` exists in global DI */
    has: function (name) { return $injector.get(name) != null; },
    /**
     * Injects a function
     *
     * @param fn the function to inject
     * @param context the function's `this` binding
     * @param locals An object with additional DI tokens and values, such as `{ someToken: { foo: 1 } }`
     */
    invoke: function (fn, context, locals) {
        var all = extend({}, globals, locals || {});
        var params = $injector.annotate(fn);
        var ensureExist = assertPredicate(function (key) { return all.hasOwnProperty(key); }, function (key) { return "DI can't find injectable: '" + key + "'"; });
        var args = params.filter(ensureExist).map(function (x) { return all[x]; });
        if (isFunction(fn))
            return fn.apply(context, args);
        else
            return fn.slice(-1)[0].apply(context, args);
    },
    /**
     * Returns a function's dependencies
     *
     * Analyzes a function (or array) and returns an array of DI tokens that the function requires.
     * @return an array of `string`s
     */
    annotate: function (fn) {
        if (!isInjectable(fn))
            throw new Error("Not an injectable function: " + fn);
        if (fn && fn.$inject)
            return fn.$inject;
        if (isArray(fn))
            return fn.slice(0, -1);
        var fnStr = fn.toString().replace(STRIP_COMMENTS, '');
        var result = fnStr.slice(fnStr.indexOf('(') + 1, fnStr.indexOf(')')).match(ARGUMENT_NAMES);
        return result || [];
    },
};
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