@angular/common
Version:
Angular - commonly needed directives and services
160 lines • 12.5 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { Injectable, KeyValueDiffers, Pipe } from '@angular/core';
/**
* @template K, V
* @param {?} key
* @param {?} value
* @return {?}
*/
function makeKeyValuePair(key, value) {
return { key: key, value: value };
}
/**
* A key value pair.
* Usually used to represent the key value pairs from a Map or Object.
*
* \@publicApi
* @record
* @template K, V
*/
export function KeyValue() { }
if (false) {
/** @type {?} */
KeyValue.prototype.key;
/** @type {?} */
KeyValue.prototype.value;
}
/**
* \@ngModule CommonModule
* \@description
*
* Transforms Object or Map into an array of key value pairs.
*
* The output array will be ordered by keys.
* By default the comparator will be by Unicode point value.
* You can optionally pass a compareFn if your keys are complex types.
*
* \@usageNotes
* ### Examples
*
* This examples show how an Object or a Map can be iterated by ngFor with the use of this keyvalue
* pipe.
*
* {\@example common/pipes/ts/keyvalue_pipe.ts region='KeyValuePipe'}
*
* \@publicApi
*/
export class KeyValuePipe {
/**
* @param {?} differs
*/
constructor(differs) {
this.differs = differs;
this.keyValues = [];
}
/**
* @template K, V
* @param {?} input
* @param {?=} compareFn
* @return {?}
*/
transform(input, compareFn = defaultComparator) {
if (!input || (!(input instanceof Map) && typeof input !== 'object')) {
return null;
}
if (!this.differ) {
// make a differ for whatever type we've been passed in
this.differ = this.differs.find(input).create();
}
/** @type {?} */
const differChanges = this.differ.diff((/** @type {?} */ (input)));
if (differChanges) {
this.keyValues = [];
differChanges.forEachItem((/**
* @param {?} r
* @return {?}
*/
(r) => {
this.keyValues.push(makeKeyValuePair(r.key, (/** @type {?} */ (r.currentValue))));
}));
this.keyValues.sort(compareFn);
}
return this.keyValues;
}
}
KeyValuePipe.decorators = [
{ type: Injectable },
{ type: Pipe, args: [{ name: 'keyvalue', pure: false },] }
];
/** @nocollapse */
KeyValuePipe.ctorParameters = () => [
{ type: KeyValueDiffers }
];
if (false) {
/**
* @type {?}
* @private
*/
KeyValuePipe.prototype.differ;
/**
* @type {?}
* @private
*/
KeyValuePipe.prototype.keyValues;
/**
* @type {?}
* @private
*/
KeyValuePipe.prototype.differs;
}
/**
* @template K, V
* @param {?} keyValueA
* @param {?} keyValueB
* @return {?}
*/
export function defaultComparator(keyValueA, keyValueB) {
/** @type {?} */
const a = keyValueA.key;
/** @type {?} */
const b = keyValueB.key;
// if same exit with 0;
if (a === b)
return 0;
// make sure that undefined are at the end of the sort.
if (a === undefined)
return 1;
if (b === undefined)
return -1;
// make sure that nulls are at the end of the sort.
if (a === null)
return 1;
if (b === null)
return -1;
if (typeof a == 'string' && typeof b == 'string') {
return a < b ? -1 : 1;
}
if (typeof a == 'number' && typeof b == 'number') {
return a - b;
}
if (typeof a == 'boolean' && typeof b == 'boolean') {
return a < b ? -1 : 1;
}
// `a` and `b` are of different types. Compare their string values.
/** @type {?} */
const aString = String(a);
/** @type {?} */
const bString = String(b);
return aString == bString ? 0 : aString < bString ? -1 : 1;
}
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All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Injectable, KeyValueChangeRecord, KeyValueChanges, KeyValueDiffer, KeyValueDiffers, Pipe, PipeTransform} from '@angular/core';\n\nfunction makeKeyValuePair<K, V>(key: K, value: V): KeyValue<K, V> {\n  return {key: key, value: value};\n}\n\n/**\n * A key value pair.\n * Usually used to represent the key value pairs from a Map or Object.\n *\n * @publicApi\n */\nexport interface KeyValue<K, V> {\n  key: K;\n  value: V;\n}\n\n/**\n * @ngModule CommonModule\n * @description\n *\n * Transforms Object or Map into an array of key value pairs.\n *\n * The output array will be ordered by keys.\n * By default the comparator will be by Unicode point value.\n * You can optionally pass a compareFn if your keys are complex types.\n *\n * @usageNotes\n * ### Examples\n *\n * This examples show how an Object or a Map can be iterated by ngFor with the use of this keyvalue\n * pipe.\n *\n * {@example common/pipes/ts/keyvalue_pipe.ts region='KeyValuePipe'}\n *\n * @publicApi\n */\n@Injectable()\n@Pipe({name: 'keyvalue', pure: false})\nexport class KeyValuePipe implements PipeTransform {\n  constructor(private readonly differs: KeyValueDiffers) {}\n\n  private differ !: KeyValueDiffer<any, any>;\n  private keyValues: Array<KeyValue<any, any>> = [];\n\n  transform<K, V>(input: null, compareFn?: (a: KeyValue<K, V>, b: KeyValue<K, V>) => number): null;\n  transform<V>(\n      input: {[key: string]: V}|Map<string, V>,\n      compareFn?: (a: KeyValue<string, V>, b: KeyValue<string, V>) => number):\n      Array<KeyValue<string, V>>;\n  transform<V>(\n      input: {[key: number]: V}|Map<number, V>,\n      compareFn?: (a: KeyValue<number, V>, b: KeyValue<number, V>) => number):\n      Array<KeyValue<number, V>>;\n  transform<K, V>(input: Map<K, V>, compareFn?: (a: KeyValue<K, V>, b: KeyValue<K, V>) => number):\n      Array<KeyValue<K, V>>;\n  transform<K, V>(\n      input: null|{[key: string]: V, [key: number]: V}|Map<K, V>,\n      compareFn: (a: KeyValue<K, V>, b: KeyValue<K, V>) => number = defaultComparator):\n      Array<KeyValue<K, V>>|null {\n    if (!input || (!(input instanceof Map) && typeof input !== 'object')) {\n      return null;\n    }\n\n    if (!this.differ) {\n      // make a differ for whatever type we've been passed in\n      this.differ = this.differs.find(input).create();\n    }\n\n    const differChanges: KeyValueChanges<K, V>|null = this.differ.diff(input as any);\n\n    if (differChanges) {\n      this.keyValues = [];\n      differChanges.forEachItem((r: KeyValueChangeRecord<K, V>) => {\n        this.keyValues.push(makeKeyValuePair(r.key, r.currentValue !));\n      });\n      this.keyValues.sort(compareFn);\n    }\n    return this.keyValues;\n  }\n}\n\nexport function defaultComparator<K, V>(\n    keyValueA: KeyValue<K, V>, keyValueB: KeyValue<K, V>): number {\n  const a = keyValueA.key;\n  const b = keyValueB.key;\n  // if same exit with 0;\n  if (a === b) return 0;\n  // make sure that undefined are at the end of the sort.\n  if (a === undefined) return 1;\n  if (b === undefined) return -1;\n  // make sure that nulls are at the end of the sort.\n  if (a === null) return 1;\n  if (b === null) return -1;\n  if (typeof a == 'string' && typeof b == 'string') {\n    return a < b ? -1 : 1;\n  }\n  if (typeof a == 'number' && typeof b == 'number') {\n    return a - b;\n  }\n  if (typeof a == 'boolean' && typeof b == 'boolean') {\n    return a < b ? -1 : 1;\n  }\n  // `a` and `b` are of different types. Compare their string values.\n  const aString = String(a);\n  const bString = String(b);\n  return aString == bString ? 0 : aString < bString ? -1 : 1;\n}\n"]}