feat(router): add UrlSegment, RouteSegment, and Tree

modules/angular2/src/alt_router/segments.ts

@@ -0,0 +1,66 @@
+import {ComponentFactory} from 'angular2/core';
+import {StringMapWrapper, ListWrapper} from 'angular2/src/facade/collection';
+import {Type, isBlank} from 'angular2/src/facade/lang';
+
+export class Tree<T> {
+  constructor(private _nodes: T[]) {}
+
+  get root(): T { return this._nodes[0]; }
+
+  parent(t: T): T {
+    let index = this._nodes.indexOf(t);
+    return index > 0 ? this._nodes[index - 1] : null;
+  }
+
+  children(t: T): T[] {
+    let index = this._nodes.indexOf(t);
+    return index > -1 && index < this._nodes.length - 1 ? [this._nodes[index + 1]] : [];
+  }
+
+  firstChild(t: T): T {
+    let index = this._nodes.indexOf(t);
+    return index > -1 && index < this._nodes.length - 1 ? this._nodes[index + 1] : null;
+  }
+
+  pathToRoot(t: T): T[] {
+    let index = this._nodes.indexOf(t);
+    return index > -1 ? this._nodes.slice(0, index + 1) : null;
+  }
+}
+
+export class UrlSegment {
+  constructor(public segment: string, public parameters: {[key: string]: string},
+              public outlet: string) {}
+}
+
+export class RouteSegment {
+  /** @internal */
+  _type: Type;
+
+  /** @internal */
+  _componentFactory: ComponentFactory;
+
+  /** @internal */
+  _parameters: {[key: string]: string};
+
+  constructor(public urlSegments: UrlSegment[], parameters: {[key: string]: string},
+              public outlet: string, type: Type, componentFactory: ComponentFactory) {
+    this._type = type;
+    this._componentFactory = componentFactory;
+    this._parameters = parameters;
+  }
+
+  getParam(param: string): string { return this._parameters[param]; }
+
+  get type(): Type { return this._type; }
+}
+
+export function equalSegments(a: RouteSegment, b: RouteSegment): boolean {
+  if (isBlank(a) && !isBlank(b)) return false;
+  if (!isBlank(a) && isBlank(b)) return false;
+  return a._type === b._type && StringMapWrapper.equals(a._parameters, b._parameters);
+}
+
+export function routeSegmentComponentFactory(a: RouteSegment): ComponentFactory {
+  return a._componentFactory;
+}