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Merge pull request #482 from ckeditor/migrate-master-to-new-installat…
…ion-methods Feature: Change the implementation to only depend on types from the CKEditor packages and not runtime code to make the integration work with existing and new installation methods. MINOR BREAKING CHANGE: Add a new required `contextWatchdog` prop to the `<CKEditorContext>` component.
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Original file line number | Diff line number | Diff line change |
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/** | ||
* @license Copyright (c) 2003-2024, CKSource Holding sp. z o.o. All rights reserved. | ||
* For licensing, see LICENSE.md. | ||
*/ | ||
|
||
/** | ||
* A hash table of hex numbers to avoid using toString() in uid() which is costly. | ||
* [ '00', '01', '02', ..., 'fe', 'ff' ] | ||
*/ | ||
const HEX_NUMBERS = new Array( 256 ).fill( '' ) | ||
.map( ( _, index ) => ( '0' + ( index ).toString( 16 ) ).slice( -2 ) ); | ||
|
||
/** | ||
* Returns a unique id. The id starts with an "e" character and a randomly generated string of | ||
* 32 alphanumeric characters. | ||
* | ||
* **Note**: The characters the unique id is built from correspond to the hex number notation | ||
* (from "0" to "9", from "a" to "f"). In other words, each id corresponds to an "e" followed | ||
* by 16 8-bit numbers next to each other. | ||
* | ||
* @returns An unique id string. | ||
*/ | ||
export function uid(): string { | ||
// Let's create some positive random 32bit integers first. | ||
// | ||
// 1. Math.random() is a float between 0 and 1. | ||
// 2. 0x100000000 is 2^32 = 4294967296. | ||
// 3. >>> 0 enforces integer (in JS all numbers are floating point). | ||
// | ||
// For instance: | ||
// Math.random() * 0x100000000 = 3366450031.853859 | ||
// but | ||
// Math.random() * 0x100000000 >>> 0 = 3366450031. | ||
const r1 = Math.random() * 0x100000000 >>> 0; | ||
const r2 = Math.random() * 0x100000000 >>> 0; | ||
const r3 = Math.random() * 0x100000000 >>> 0; | ||
const r4 = Math.random() * 0x100000000 >>> 0; | ||
|
||
// Make sure that id does not start with number. | ||
return 'e' + | ||
HEX_NUMBERS[ r1 >> 0 & 0xFF ] + | ||
HEX_NUMBERS[ r1 >> 8 & 0xFF ] + | ||
HEX_NUMBERS[ r1 >> 16 & 0xFF ] + | ||
HEX_NUMBERS[ r1 >> 24 & 0xFF ] + | ||
HEX_NUMBERS[ r2 >> 0 & 0xFF ] + | ||
HEX_NUMBERS[ r2 >> 8 & 0xFF ] + | ||
HEX_NUMBERS[ r2 >> 16 & 0xFF ] + | ||
HEX_NUMBERS[ r2 >> 24 & 0xFF ] + | ||
HEX_NUMBERS[ r3 >> 0 & 0xFF ] + | ||
HEX_NUMBERS[ r3 >> 8 & 0xFF ] + | ||
HEX_NUMBERS[ r3 >> 16 & 0xFF ] + | ||
HEX_NUMBERS[ r3 >> 24 & 0xFF ] + | ||
HEX_NUMBERS[ r4 >> 0 & 0xFF ] + | ||
HEX_NUMBERS[ r4 >> 8 & 0xFF ] + | ||
HEX_NUMBERS[ r4 >> 16 & 0xFF ] + | ||
HEX_NUMBERS[ r4 >> 24 & 0xFF ]; | ||
} |
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