@angular/core
Version:
Angular - the core framework
309 lines • 32.3 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 { assertEqual, assertLessThanOrEqual } from './assert';
/**
* Equivalent to ES6 spread, add each item to an array.
*
* @param items The items to add
* @param arr The array to which you want to add the items
*/
export function addAllToArray(items, arr) {
for (let i = 0; i < items.length; i++) {
arr.push(items[i]);
}
}
/**
* Flattens an array.
*/
export function flatten(list, dst) {
if (dst === undefined)
dst = list;
for (let i = 0; i < list.length; i++) {
let item = list[i];
if (Array.isArray(item)) {
// we need to inline it.
if (dst === list) {
// Our assumption that the list was already flat was wrong and
// we need to clone flat since we need to write to it.
dst = list.slice(0, i);
}
flatten(item, dst);
}
else if (dst !== list) {
dst.push(item);
}
}
return dst;
}
export function deepForEach(input, fn) {
input.forEach(value => Array.isArray(value) ? deepForEach(value, fn) : fn(value));
}
export function addToArray(arr, index, value) {
// perf: array.push is faster than array.splice!
if (index >= arr.length) {
arr.push(value);
}
else {
arr.splice(index, 0, value);
}
}
export function removeFromArray(arr, index) {
// perf: array.pop is faster than array.splice!
if (index >= arr.length - 1) {
return arr.pop();
}
else {
return arr.splice(index, 1)[0];
}
}
export function newArray(size, value) {
const list = [];
for (let i = 0; i < size; i++) {
list.push(value);
}
return list;
}
/**
* Remove item from array (Same as `Array.splice()` but faster.)
*
* `Array.splice()` is not as fast because it has to allocate an array for the elements which were
* removed. This causes memory pressure and slows down code when most of the time we don't
* care about the deleted items array.
*
* https://jsperf.com/fast-array-splice (About 20x faster)
*
* @param array Array to splice
* @param index Index of element in array to remove.
* @param count Number of items to remove.
*/
export function arraySplice(array, index, count) {
const length = array.length - count;
while (index < length) {
array[index] = array[index + count];
index++;
}
while (count--) {
array.pop(); // shrink the array
}
}
/**
* Same as `Array.splice(index, 0, value)` but faster.
*
* `Array.splice()` is not fast because it has to allocate an array for the elements which were
* removed. This causes memory pressure and slows down code when most of the time we don't
* care about the deleted items array.
*
* @param array Array to splice.
* @param index Index in array where the `value` should be added.
* @param value Value to add to array.
*/
export function arrayInsert(array, index, value) {
ngDevMode && assertLessThanOrEqual(index, array.length, 'Can\'t insert past array end.');
let end = array.length;
while (end > index) {
const previousEnd = end - 1;
array[end] = array[previousEnd];
end = previousEnd;
}
array[index] = value;
}
/**
* Same as `Array.splice2(index, 0, value1, value2)` but faster.
*
* `Array.splice()` is not fast because it has to allocate an array for the elements which were
* removed. This causes memory pressure and slows down code when most of the time we don't
* care about the deleted items array.
*
* @param array Array to splice.
* @param index Index in array where the `value` should be added.
* @param value1 Value to add to array.
* @param value2 Value to add to array.
*/
export function arrayInsert2(array, index, value1, value2) {
ngDevMode && assertLessThanOrEqual(index, array.length, 'Can\'t insert past array end.');
let end = array.length;
if (end == index) {
// inserting at the end.
array.push(value1, value2);
}
else if (end === 1) {
// corner case when we have less items in array than we have items to insert.
array.push(value2, array[0]);
array[0] = value1;
}
else {
end--;
array.push(array[end - 1], array[end]);
while (end > index) {
const previousEnd = end - 2;
array[end] = array[previousEnd];
end--;
}
array[index] = value1;
array[index + 1] = value2;
}
}
/**
* Insert a `value` into an `array` so that the array remains sorted.
*
* NOTE:
* - Duplicates are not allowed, and are ignored.
* - This uses binary search algorithm for fast inserts.
*
* @param array A sorted array to insert into.
* @param value The value to insert.
* @returns index of the inserted value.
*/
export function arrayInsertSorted(array, value) {
let index = arrayIndexOfSorted(array, value);
if (index < 0) {
// if we did not find it insert it.
index = ~index;
arrayInsert(array, index, value);
}
return index;
}
/**
* Remove `value` from a sorted `array`.
*
* NOTE:
* - This uses binary search algorithm for fast removals.
*
* @param array A sorted array to remove from.
* @param value The value to remove.
* @returns index of the removed value.
* - positive index if value found and removed.
* - negative index if value not found. (`~index` to get the value where it should have been
* inserted)
*/
export function arrayRemoveSorted(array, value) {
const index = arrayIndexOfSorted(array, value);
if (index >= 0) {
arraySplice(array, index, 1);
}
return index;
}
/**
* Get an index of an `value` in a sorted `array`.
*
* NOTE:
* - This uses binary search algorithm for fast removals.
*
* @param array A sorted array to binary search.
* @param value The value to look for.
* @returns index of the value.
* - positive index if value found.
* - negative index if value not found. (`~index` to get the value where it should have been
* located)
*/
export function arrayIndexOfSorted(array, value) {
return _arrayIndexOfSorted(array, value, 0);
}
/**
* Set a `value` for a `key`.
*
* @param keyValueArray to modify.
* @param key The key to locate or create.
* @param value The value to set for a `key`.
* @returns index (always even) of where the value vas set.
*/
export function keyValueArraySet(keyValueArray, key, value) {
let index = keyValueArrayIndexOf(keyValueArray, key);
if (index >= 0) {
// if we found it set it.
keyValueArray[index | 1] = value;
}
else {
index = ~index;
arrayInsert2(keyValueArray, index, key, value);
}
return index;
}
/**
* Retrieve a `value` for a `key` (on `undefined` if not found.)
*
* @param keyValueArray to search.
* @param key The key to locate.
* @return The `value` stored at the `key` location or `undefined if not found.
*/
export function keyValueArrayGet(keyValueArray, key) {
const index = keyValueArrayIndexOf(keyValueArray, key);
if (index >= 0) {
// if we found it retrieve it.
return keyValueArray[index | 1];
}
return undefined;
}
/**
* Retrieve a `key` index value in the array or `-1` if not found.
*
* @param keyValueArray to search.
* @param key The key to locate.
* @returns index of where the key is (or should have been.)
* - positive (even) index if key found.
* - negative index if key not found. (`~index` (even) to get the index where it should have
* been inserted.)
*/
export function keyValueArrayIndexOf(keyValueArray, key) {
return _arrayIndexOfSorted(keyValueArray, key, 1);
}
/**
* Delete a `key` (and `value`) from the `KeyValueArray`.
*
* @param keyValueArray to modify.
* @param key The key to locate or delete (if exist).
* @returns index of where the key was (or should have been.)
* - positive (even) index if key found and deleted.
* - negative index if key not found. (`~index` (even) to get the index where it should have
* been.)
*/
export function keyValueArrayDelete(keyValueArray, key) {
const index = keyValueArrayIndexOf(keyValueArray, key);
if (index >= 0) {
// if we found it remove it.
arraySplice(keyValueArray, index, 2);
}
return index;
}
/**
* INTERNAL: Get an index of an `value` in a sorted `array` by grouping search by `shift`.
*
* NOTE:
* - This uses binary search algorithm for fast removals.
*
* @param array A sorted array to binary search.
* @param value The value to look for.
* @param shift grouping shift.
* - `0` means look at every location
* - `1` means only look at every other (even) location (the odd locations are to be ignored as
* they are values.)
* @returns index of the value.
* - positive index if value found.
* - negative index if value not found. (`~index` to get the value where it should have been
* inserted)
*/
function _arrayIndexOfSorted(array, value, shift) {
ngDevMode && assertEqual(Array.isArray(array), true, 'Expecting an array');
let start = 0;
let end = array.length >> shift;
while (end !== start) {
const middle = start + ((end - start) >> 1); // find the middle.
const current = array[middle << shift];
if (value === current) {
return (middle << shift);
}
else if (current > value) {
end = middle;
}
else {
start = middle + 1; // We already searched middle so make it non-inclusive by adding 1
}
}
return ~(end << shift);
}
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* @license\n * Copyright Google Inc. 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 {assertEqual, assertLessThanOrEqual} from './assert';\n\n/**\n * Equivalent to ES6 spread, add each item to an array.\n *\n * @param items The items to add\n * @param arr The array to which you want to add the items\n */\nexport function addAllToArray(items: any[], arr: any[]) {\n  for (let i = 0; i < items.length; i++) {\n    arr.push(items[i]);\n  }\n}\n\n/**\n * Flattens an array.\n */\nexport function flatten(list: any[], dst?: any[]): any[] {\n  if (dst === undefined) dst = list;\n  for (let i = 0; i < list.length; i++) {\n    let item = list[i];\n    if (Array.isArray(item)) {\n      // we need to inline it.\n      if (dst === list) {\n        // Our assumption that the list was already flat was wrong and\n        // we need to clone flat since we need to write to it.\n        dst = list.slice(0, i);\n      }\n      flatten(item, dst);\n    } else if (dst !== list) {\n      dst.push(item);\n    }\n  }\n  return dst;\n}\n\nexport function deepForEach<T>(input: (T|any[])[], fn: (value: T) => void): void {\n  input.forEach(value => Array.isArray(value) ? deepForEach(value, fn) : fn(value));\n}\n\nexport function addToArray(arr: any[], index: number, value: any): void {\n  // perf: array.push is faster than array.splice!\n  if (index >= arr.length) {\n    arr.push(value);\n  } else {\n    arr.splice(index, 0, value);\n  }\n}\n\nexport function removeFromArray(arr: any[], index: number): any {\n  // perf: array.pop is faster than array.splice!\n  if (index >= arr.length - 1) {\n    return arr.pop();\n  } else {\n    return arr.splice(index, 1)[0];\n  }\n}\n\nexport function newArray<T = any>(size: number): T[];\nexport function newArray<T>(size: number, value: T): T[];\nexport function newArray<T>(size: number, value?: T): T[] {\n  const list: T[] = [];\n  for (let i = 0; i < size; i++) {\n    list.push(value!);\n  }\n  return list;\n}\n\n/**\n * Remove item from array (Same as `Array.splice()` but faster.)\n *\n * `Array.splice()` is not as fast because it has to allocate an array for the elements which were\n * removed. This causes memory pressure and slows down code when most of the time we don't\n * care about the deleted items array.\n *\n * https://jsperf.com/fast-array-splice (About 20x faster)\n *\n * @param array Array to splice\n * @param index Index of element in array to remove.\n * @param count Number of items to remove.\n */\nexport function arraySplice(array: any[], index: number, count: number): void {\n  const length = array.length - count;\n  while (index < length) {\n    array[index] = array[index + count];\n    index++;\n  }\n  while (count--) {\n    array.pop();  // shrink the array\n  }\n}\n\n/**\n * Same as `Array.splice(index, 0, value)` but faster.\n *\n * `Array.splice()` is not fast because it has to allocate an array for the elements which were\n * removed. This causes memory pressure and slows down code when most of the time we don't\n * care about the deleted items array.\n *\n * @param array Array to splice.\n * @param index Index in array where the `value` should be added.\n * @param value Value to add to array.\n */\nexport function arrayInsert(array: any[], index: number, value: any): void {\n  ngDevMode && assertLessThanOrEqual(index, array.length, 'Can\\'t insert past array end.');\n  let end = array.length;\n  while (end > index) {\n    const previousEnd = end - 1;\n    array[end] = array[previousEnd];\n    end = previousEnd;\n  }\n  array[index] = value;\n}\n\n/**\n * Same as `Array.splice2(index, 0, value1, value2)` but faster.\n *\n * `Array.splice()` is not fast because it has to allocate an array for the elements which were\n * removed. This causes memory pressure and slows down code when most of the time we don't\n * care about the deleted items array.\n *\n * @param array Array to splice.\n * @param index Index in array where the `value` should be added.\n * @param value1 Value to add to array.\n * @param value2 Value to add to array.\n */\nexport function arrayInsert2(array: any[], index: number, value1: any, value2: any): void {\n  ngDevMode && assertLessThanOrEqual(index, array.length, 'Can\\'t insert past array end.');\n  let end = array.length;\n  if (end == index) {\n    // inserting at the end.\n    array.push(value1, value2);\n  } else if (end === 1) {\n    // corner case when we have less items in array than we have items to insert.\n    array.push(value2, array[0]);\n    array[0] = value1;\n  } else {\n    end--;\n    array.push(array[end - 1], array[end]);\n    while (end > index) {\n      const previousEnd = end - 2;\n      array[end] = array[previousEnd];\n      end--;\n    }\n    array[index] = value1;\n    array[index + 1] = value2;\n  }\n}\n\n/**\n * Insert a `value` into an `array` so that the array remains sorted.\n *\n * NOTE:\n * - Duplicates are not allowed, and are ignored.\n * - This uses binary search algorithm for fast inserts.\n *\n * @param array A sorted array to insert into.\n * @param value The value to insert.\n * @returns index of the inserted value.\n */\nexport function arrayInsertSorted(array: string[], value: string): number {\n  let index = arrayIndexOfSorted(array, value);\n  if (index < 0) {\n    // if we did not find it insert it.\n    index = ~index;\n    arrayInsert(array, index, value);\n  }\n  return index;\n}\n\n/**\n * Remove `value` from a sorted `array`.\n *\n * NOTE:\n * - This uses binary search algorithm for fast removals.\n *\n * @param array A sorted array to remove from.\n * @param value The value to remove.\n * @returns index of the removed value.\n *   - positive index if value found and removed.\n *   - negative index if value not found. (`~index` to get the value where it should have been\n *     inserted)\n */\nexport function arrayRemoveSorted(array: string[], value: string): number {\n  const index = arrayIndexOfSorted(array, value);\n  if (index >= 0) {\n    arraySplice(array, index, 1);\n  }\n  return index;\n}\n\n\n/**\n * Get an index of an `value` in a sorted `array`.\n *\n * NOTE:\n * - This uses binary search algorithm for fast removals.\n *\n * @param array A sorted array to binary search.\n * @param value The value to look for.\n * @returns index of the value.\n *   - positive index if value found.\n *   - negative index if value not found. (`~index` to get the value where it should have been\n *     located)\n */\nexport function arrayIndexOfSorted(array: string[], value: string): number {\n  return _arrayIndexOfSorted(array, value, 0);\n}\n\n\n/**\n * `KeyValueArray` is an array where even positions contain keys and odd positions contain values.\n *\n * `KeyValueArray` provides a very efficient way of iterating over its contents. For small\n * sets (~10) the cost of binary searching an `KeyValueArray` has about the same performance\n * characteristics that of a `Map` with significantly better memory footprint.\n *\n * If used as a `Map` the keys are stored in alphabetical order so that they can be binary searched\n * for retrieval.\n *\n * See: `keyValueArraySet`, `keyValueArrayGet`, `keyValueArrayIndexOf`, `keyValueArrayDelete`.\n */\nexport interface KeyValueArray<VALUE> extends Array<VALUE|string> {\n  __brand__: 'array-map';\n}\n\n/**\n * Set a `value` for a `key`.\n *\n * @param keyValueArray to modify.\n * @param key The key to locate or create.\n * @param value The value to set for a `key`.\n * @returns index (always even) of where the value vas set.\n */\nexport function keyValueArraySet<V>(\n    keyValueArray: KeyValueArray<V>, key: string, value: V): number {\n  let index = keyValueArrayIndexOf(keyValueArray, key);\n  if (index >= 0) {\n    // if we found it set it.\n    keyValueArray[index | 1] = value;\n  } else {\n    index = ~index;\n    arrayInsert2(keyValueArray, index, key, value);\n  }\n  return index;\n}\n\n/**\n * Retrieve a `value` for a `key` (on `undefined` if not found.)\n *\n * @param keyValueArray to search.\n * @param key The key to locate.\n * @return The `value` stored at the `key` location or `undefined if not found.\n */\nexport function keyValueArrayGet<V>(keyValueArray: KeyValueArray<V>, key: string): V|undefined {\n  const index = keyValueArrayIndexOf(keyValueArray, key);\n  if (index >= 0) {\n    // if we found it retrieve it.\n    return keyValueArray[index | 1] as V;\n  }\n  return undefined;\n}\n\n/**\n * Retrieve a `key` index value in the array or `-1` if not found.\n *\n * @param keyValueArray to search.\n * @param key The key to locate.\n * @returns index of where the key is (or should have been.)\n *   - positive (even) index if key found.\n *   - negative index if key not found. (`~index` (even) to get the index where it should have\n *     been inserted.)\n */\nexport function keyValueArrayIndexOf<V>(keyValueArray: KeyValueArray<V>, key: string): number {\n  return _arrayIndexOfSorted(keyValueArray as string[], key, 1);\n}\n\n/**\n * Delete a `key` (and `value`) from the `KeyValueArray`.\n *\n * @param keyValueArray to modify.\n * @param key The key to locate or delete (if exist).\n * @returns index of where the key was (or should have been.)\n *   - positive (even) index if key found and deleted.\n *   - negative index if key not found. (`~index` (even) to get the index where it should have\n *     been.)\n */\nexport function keyValueArrayDelete<V>(keyValueArray: KeyValueArray<V>, key: string): number {\n  const index = keyValueArrayIndexOf(keyValueArray, key);\n  if (index >= 0) {\n    // if we found it remove it.\n    arraySplice(keyValueArray, index, 2);\n  }\n  return index;\n}\n\n\n/**\n * INTERNAL: Get an index of an `value` in a sorted `array` by grouping search by `shift`.\n *\n * NOTE:\n * - This uses binary search algorithm for fast removals.\n *\n * @param array A sorted array to binary search.\n * @param value The value to look for.\n * @param shift grouping shift.\n *   - `0` means look at every location\n *   - `1` means only look at every other (even) location (the odd locations are to be ignored as\n *         they are values.)\n * @returns index of the value.\n *   - positive index if value found.\n *   - negative index if value not found. (`~index` to get the value where it should have been\n * inserted)\n */\nfunction _arrayIndexOfSorted(array: string[], value: string, shift: number): number {\n  ngDevMode && assertEqual(Array.isArray(array), true, 'Expecting an array');\n  let start = 0;\n  let end = array.length >> shift;\n  while (end !== start) {\n    const middle = start + ((end - start) >> 1);  // find the middle.\n    const current = array[middle << shift];\n    if (value === current) {\n      return (middle << shift);\n    } else if (current > value) {\n      end = middle;\n    } else {\n      start = middle + 1;  // We already searched middle so make it non-inclusive by adding 1\n    }\n  }\n  return ~(end << shift);\n}\n"]}