@angular/core
Version:
Angular - the core framework
101 lines • 11.5 kB
JavaScript
/**
* @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 { looseIdentical } from '../util/comparison';
import { getSymbolIterator } from '../util/symbol';
export function devModeEqual(a, b) {
var isListLikeIterableA = isListLikeIterable(a);
var isListLikeIterableB = isListLikeIterable(b);
if (isListLikeIterableA && isListLikeIterableB) {
return areIterablesEqual(a, b, devModeEqual);
}
else {
var isAObject = a && (typeof a === 'object' || typeof a === 'function');
var isBObject = b && (typeof b === 'object' || typeof b === 'function');
if (!isListLikeIterableA && isAObject && !isListLikeIterableB && isBObject) {
return true;
}
else {
return looseIdentical(a, b);
}
}
}
/**
* Indicates that the result of a {@link Pipe} transformation has changed even though the
* reference has not changed.
*
* Wrapped values are unwrapped automatically during the change detection, and the unwrapped value
* is stored.
*
* Example:
*
* ```
* if (this._latestValue === this._latestReturnedValue) {
* return this._latestReturnedValue;
* } else {
* this._latestReturnedValue = this._latestValue;
* return WrappedValue.wrap(this._latestValue); // this will force update
* }
* ```
*
* @publicApi
*/
var WrappedValue = /** @class */ (function () {
function WrappedValue(value) {
this.wrapped = value;
}
/** Creates a wrapped value. */
WrappedValue.wrap = function (value) { return new WrappedValue(value); };
/**
* Returns the underlying value of a wrapped value.
* Returns the given `value` when it is not wrapped.
**/
WrappedValue.unwrap = function (value) { return WrappedValue.isWrapped(value) ? value.wrapped : value; };
/** Returns true if `value` is a wrapped value. */
WrappedValue.isWrapped = function (value) { return value instanceof WrappedValue; };
return WrappedValue;
}());
export { WrappedValue };
export function isListLikeIterable(obj) {
if (!isJsObject(obj))
return false;
return Array.isArray(obj) ||
(!(obj instanceof Map) && // JS Map are iterables but return entries as [k, v]
getSymbolIterator() in obj); // JS Iterable have a Symbol.iterator prop
}
export function areIterablesEqual(a, b, comparator) {
var iterator1 = a[getSymbolIterator()]();
var iterator2 = b[getSymbolIterator()]();
while (true) {
var item1 = iterator1.next();
var item2 = iterator2.next();
if (item1.done && item2.done)
return true;
if (item1.done || item2.done)
return false;
if (!comparator(item1.value, item2.value))
return false;
}
}
export function iterateListLike(obj, fn) {
if (Array.isArray(obj)) {
for (var i = 0; i < obj.length; i++) {
fn(obj[i]);
}
}
else {
var iterator = obj[getSymbolIterator()]();
var item = void 0;
while (!((item = iterator.next()).done)) {
fn(item.value);
}
}
}
export function isJsObject(o) {
return o !== null && (typeof o === 'function' || typeof o === 'object');
}
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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 {looseIdentical} from '../util/comparison';\nimport {getSymbolIterator} from '../util/symbol';\n\nexport function devModeEqual(a: any, b: any): boolean {\n  const isListLikeIterableA = isListLikeIterable(a);\n  const isListLikeIterableB = isListLikeIterable(b);\n  if (isListLikeIterableA && isListLikeIterableB) {\n    return areIterablesEqual(a, b, devModeEqual);\n  } else {\n    const isAObject = a && (typeof a === 'object' || typeof a === 'function');\n    const isBObject = b && (typeof b === 'object' || typeof b === 'function');\n    if (!isListLikeIterableA && isAObject && !isListLikeIterableB && isBObject) {\n      return true;\n    } else {\n      return looseIdentical(a, b);\n    }\n  }\n}\n\n/**\n * Indicates that the result of a {@link Pipe} transformation has changed even though the\n * reference has not changed.\n *\n * Wrapped values are unwrapped automatically during the change detection, and the unwrapped value\n * is stored.\n *\n * Example:\n *\n * ```\n * if (this._latestValue === this._latestReturnedValue) {\n *    return this._latestReturnedValue;\n *  } else {\n *    this._latestReturnedValue = this._latestValue;\n *    return WrappedValue.wrap(this._latestValue); // this will force update\n *  }\n * ```\n *\n * @publicApi\n */\nexport class WrappedValue {\n  /** @deprecated from 5.3, use `unwrap()` instead - will switch to protected */\n  wrapped: any;\n\n  constructor(value: any) { this.wrapped = value; }\n\n  /** Creates a wrapped value. */\n  static wrap(value: any): WrappedValue { return new WrappedValue(value); }\n\n  /**\n   * Returns the underlying value of a wrapped value.\n   * Returns the given `value` when it is not wrapped.\n   **/\n  static unwrap(value: any): any { return WrappedValue.isWrapped(value) ? value.wrapped : value; }\n\n  /** Returns true if `value` is a wrapped value. */\n  static isWrapped(value: any): value is WrappedValue { return value instanceof WrappedValue; }\n}\n\nexport function isListLikeIterable(obj: any): boolean {\n  if (!isJsObject(obj)) return false;\n  return Array.isArray(obj) ||\n      (!(obj instanceof Map) &&      // JS Map are iterables but return entries as [k, v]\n       getSymbolIterator() in obj);  // JS Iterable have a Symbol.iterator prop\n}\n\nexport function areIterablesEqual(\n    a: any, b: any, comparator: (a: any, b: any) => boolean): boolean {\n  const iterator1 = a[getSymbolIterator()]();\n  const iterator2 = b[getSymbolIterator()]();\n\n  while (true) {\n    const item1 = iterator1.next();\n    const item2 = iterator2.next();\n    if (item1.done && item2.done) return true;\n    if (item1.done || item2.done) return false;\n    if (!comparator(item1.value, item2.value)) return false;\n  }\n}\n\nexport function iterateListLike(obj: any, fn: (p: any) => any) {\n  if (Array.isArray(obj)) {\n    for (let i = 0; i < obj.length; i++) {\n      fn(obj[i]);\n    }\n  } else {\n    const iterator = obj[getSymbolIterator()]();\n    let item: any;\n    while (!((item = iterator.next()).done)) {\n      fn(item.value);\n    }\n  }\n}\n\nexport function isJsObject(o: any): boolean {\n  return o !== null && (typeof o === 'function' || typeof o === 'object');\n}\n"]}