angular-cn/modules/angular2/src/facade/collection.ts

import {int, isJsObject, global} from 'angular2/src/facade/lang';

// HACK: workaround for Traceur behavior.
// It expects all transpiled modules to contain this marker.
// TODO: remove this when we no longer use traceur
export var __esModule = true;

export var List = global.Array;
export var Map = global.Map;
export var Set = global.Set;
export var StringMap = global.Object;

export class MapWrapper {
  static create(): Map<any, any> { return new Map(); }
  static clone<K, V>(m: Map<K, V>): Map<K, V> { return new Map(m); }
  static createFromStringMap(stringMap): Map<string, any> {
    var result = MapWrapper.create();
    for (var prop in stringMap) {
      MapWrapper.set(result, prop, stringMap[prop]);
    }
    return result;
  }
  static createFromPairs(pairs: List<any>): Map<any, any> { return new Map(pairs); }
  static get(m, k) { return m.get(k); }
  static set(m, k, v) { m.set(k, v); }
  static contains(m, k) { return m.has(k); }
  static forEach(m, fn) { m.forEach(fn); }
  static size(m) { return m.size; }
  static delete (m, k) { m.delete(k); }
  static clear(m) { m.clear(); }
  static clearValues(m) {
    var keyIterator = m.keys();
    var k;
    while (!((k = keyIterator.next()).done)) {
      m.set(k.value, null);
    }
  }
  static iterable(m) { return m; }
  static keys(m) { return m.keys(); }
  static values(m) { return m.values(); }
}

/**
 * Wraps Javascript Objects
 */
export class StringMapWrapper {
  static create(): Object {
    // Note: We are not using Object.create(null) here due to
    // performance!
    // http://jsperf.com/ng2-object-create-null
    return {};
  }
  static contains(map, key) { return map.hasOwnProperty(key); }
  static get(map, key) { return map.hasOwnProperty(key) ? map[key] : undefined; }
  static set(map, key, value) { map[key] = value; }
  static isEmpty(map) {
    for (var prop in map) {
      return false;
    }
    return true;
  }
  static delete (map, key) { delete map[key]; }
  static forEach(map, callback) {
    for (var prop in map) {
      if (map.hasOwnProperty(prop)) {
        callback(map[prop], prop);
      }
    }
  }

  static merge(m1, m2) {
    var m = {};

    for (var attr in m1) {
      if (m1.hasOwnProperty(attr)) {
        m[attr] = m1[attr];
      }
    }

    for (var attr in m2) {
      if (m2.hasOwnProperty(attr)) {
        m[attr] = m2[attr];
      }
    }

    return m;
  }
}

export class ListWrapper {
  static create(): List<any> { return new List(); }
  static createFixedSize(size): List<any> { return new List(size); }
  static get(m, k) { return m[k]; }
  static set(m, k, v) { m[k] = v; }
  static clone(array: List<any>) { return array.slice(0); }
  static map(array, fn) { return array.map(fn); }
  static forEach(array: List<any>, fn: Function) {
    for (var i = 0; i < array.length; i++) {
      fn(array[i]);
    }
  }
  static push(array, el) { array.push(el); }
  static first(array) {
    if (!array) return null;
    return array[0];
  }
  static last(array) {
    if (!array || array.length == 0) return null;
    return array[array.length - 1];
  }
  static find(list: List<any>, pred: Function) {
    for (var i = 0; i < list.length; ++i) {
      if (pred(list[i])) return list[i];
    }
    return null;
  }
  static reduce<T>(list: List<T>,
                   fn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T,
                   init: T) {
    return list.reduce(fn, init);
  }
  static filter(array, pred: Function) { return array.filter(pred); }
  static any(list: List<any>, pred: Function) {
    for (var i = 0; i < list.length; ++i) {
      if (pred(list[i])) return true;
    }
    return false;
  }
  static contains(list: List<any>, el) { return list.indexOf(el) !== -1; }
  static reversed(array) {
    var a = ListWrapper.clone(array);
    return a.reverse();
  }
  static concat(a, b) { return a.concat(b); }
  static isList(list) { return Array.isArray(list); }
  static insert(list, index: int, value) { list.splice(index, 0, value); }
  static removeAt(list, index: int) {
    var res = list[index];
    list.splice(index, 1);
    return res;
  }
  static removeAll(list, items) {
    for (var i = 0; i < items.length; ++i) {
      var index = list.indexOf(items[i]);
      list.splice(index, 1);
    }
  }
  static removeLast<T>(list: List<T>): T { return list.pop(); }
  static remove(list, el): boolean {
    var index = list.indexOf(el);
    if (index > -1) {
      list.splice(index, 1);
      return true;
    }
    return false;
  }
  static clear(list) { list.splice(0, list.length); }
  static join(list, s) { return list.join(s); }
  static isEmpty(list) { return list.length == 0; }
  static fill(list: List<any>, value, start: int = 0, end: int = null) {
    list.fill(value, start, end === null ? undefined : end);
  }
  static equals(a: List<any>, b: List<any>): boolean {
    if (a.length != b.length) return false;
    for (var i = 0; i < a.length; ++i) {
      if (a[i] !== b[i]) return false;
    }
    return true;
  }
  static slice<T>(l: List<T>, from: int, to: int): List<T> { return l.slice(from, to); }
  static splice<T>(l: List<T>, from: int, length: int): List<T> { return l.splice(from, length); }
  static sort<T>(l: List<T>, compareFn: (a: T, b: T) => number) { l.sort(compareFn); }
}

export function isListLikeIterable(obj): boolean {
  if (!isJsObject(obj)) return false;
  return ListWrapper.isList(obj) ||
         (!(obj instanceof Map) &&  // JS Map are iterables but return entries as [k, v]
          Symbol.iterator in obj);  // JS Iterable have a Symbol.iterator prop
}

export function iterateListLike(obj, fn: Function) {
  if (ListWrapper.isList(obj)) {
    for (var i = 0; i < obj.length; i++) {
      fn(obj[i]);
    }
  } else {
    var iterator = obj[Symbol.iterator]();
    var item;
    while (!((item = iterator.next()).done)) {
      fn(item.value);
    }
  }
}

export class SetWrapper {
  static createFromList<T>(lst: List<T>): Set<T> { return new Set(lst); }
  static has<T>(s: Set<T>, key: T): boolean { return s.has(key); }
}