mirror of
https://github.com/google/blockly.git
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71 lines
1.9 KiB
TypeScript
71 lines
1.9 KiB
TypeScript
/**
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* @license
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* Copyright 2019 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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import * as goog from '../../closure/goog/goog.js';
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goog.declareModuleId('Blockly.utils.idGenerator');
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/**
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* Legal characters for the universally unique IDs. Should be all on
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* a US keyboard. No characters that conflict with XML or JSON.
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* Requests to remove additional 'problematic' characters from this
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* soup will be denied. That's your failure to properly escape in
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* your own environment. Issues #251, #625, #682, #1304.
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*/
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const soup = '!#$%()*+,-./:;=?@[]^_`{|}~' +
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'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
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/**
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* Namespace object for internal implementations we want to be able to
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* stub in tests. Do not use externally.
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*
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* @internal
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*/
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const internal = {
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/**
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* Generate a random unique ID. This should be globally unique.
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* 87 characters ^ 20 length is greater than 128 bits (better than a UUID).
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*
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* @returns A globally unique ID string.
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*/
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genUid: () => {
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const length = 20;
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const soupLength = soup.length;
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const id = [];
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for (let i = 0; i < length; i++) {
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id[i] = soup.charAt(Math.random() * soupLength);
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}
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return id.join('');
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},
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};
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export const TEST_ONLY = internal;
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/** Next unique ID to use. */
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let nextId = 0;
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/**
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* Generate the next unique element IDs.
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* IDs are compatible with the HTML4 'id' attribute restrictions:
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* Use only ASCII letters, digits, '_', '-' and '.'
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*
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* For UUIDs use genUid (below) instead; this ID generator should
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* primarily be used for IDs that end up in the DOM.
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*
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* @returns The next unique identifier.
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*/
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export function getNextUniqueId(): string {
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return 'blockly-' + (nextId++).toString(36);
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}
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/**
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* Generate a random unique ID.
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*
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* @see internal.genUid
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* @returns A globally unique ID string.
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*/
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export function genUid(): string {
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return internal.genUid();
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}
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