import { CONST_EXPR } from 'angular2/src/facade/lang';
import { OpaqueToken } from 'angular2/core';
/**
 * `LocationStrategy` is responsible for representing and reading route state
 * from the browser's URL. Angular provides two strategies:
 * {@link HashLocationStrategy} (default) and {@link PathLocationStrategy}.
 *
 * This is used under the hood of the {@link Location} service.
 *
 * Applications should use the {@link Router} or {@link Location} services to
 * interact with application route state.
 *
 * For instance, {@link HashLocationStrategy} produces URLs like
 * `http://example.com#/foo`, and {@link PathLocationStrategy} produces
 * `http://example.com/foo` as an equivalent URL.
 *
 * See these two classes for more.
 */
export class LocationStrategy {
}
/**
 * The `APP_BASE_HREF` token represents the base href to be used with the
 * {@link PathLocationStrategy}.
 *
 * If you're using {@link PathLocationStrategy}, you must provide a provider to a string
 * representing the URL prefix that should be preserved when generating and recognizing
 * URLs.
 *
 * ### Example
 *
 * ```
 * import {Component} from 'angular2/angular2';
 * import {ROUTER_DIRECTIVES, ROUTER_PROVIDERS, RouteConfig} from 'angular2/router';
 *
 * @Component({directives: [ROUTER_DIRECTIVES]})
 * @RouteConfig([
 *  {...},
 * ])
 * class AppCmp {
 *   // ...
 * }
 *
 * bootstrap(AppCmp, [
 *   ROUTER_PROVIDERS,
 *   PathLocationStrategy,
 *   provide(APP_BASE_HREF, {useValue: '/my/app'})
 * ]);
 * ```
 */
export const APP_BASE_HREF = CONST_EXPR(new OpaqueToken('appBaseHref'));
export function normalizeQueryParams(params) {
    return (params.length > 0 && params.substring(0, 1) != '?') ? ('?' + params) : params;
}
export function joinWithSlash(start, end) {
    if (start.length == 0) {
        return end;
    }
    if (end.length == 0) {
        return start;
    }
    var slashes = 0;
    if (start.endsWith('/')) {
        slashes++;
    }
    if (end.startsWith('/')) {
        slashes++;
    }
    if (slashes == 2) {
        return start + end.substring(1);
    }
    if (slashes == 1) {
        return start + end;
    }
    return start + '/' + end;
}
