mirror of
https://github.com/google/blockly.git
synced 2026-01-10 02:17:09 +01:00
68 lines
1.9 KiB
JavaScript
68 lines
1.9 KiB
JavaScript
/**
|
|
* @license
|
|
* Visual Blocks Editor
|
|
*
|
|
* Copyright 2019 Google Inc.
|
|
* https://developers.google.com/blockly/
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
/**
|
|
* @fileoverview Generator for unique element IDs.
|
|
* For UUIDs use Blockly.utils.genUid. The ID generator should primarily be
|
|
* used for IDs that end up in the DOM.
|
|
* @author samelh@google.com (Sam El-Husseini)
|
|
*/
|
|
'use strict';
|
|
|
|
|
|
goog.provide('Blockly.utils.IdGenerator');
|
|
|
|
|
|
/**
|
|
* Creates a new id generator.
|
|
* @constructor
|
|
* @final
|
|
*/
|
|
Blockly.utils.IdGenerator = function() {};
|
|
|
|
/**
|
|
* Get the singleton instance of Blockly.utils.IdGenerator.
|
|
* @returns {Blockly.utils.IdGenerator} singleton instance
|
|
*/
|
|
Blockly.utils.IdGenerator.getInstance = function() {
|
|
if (!Blockly.utils.IdGenerator.instance_) {
|
|
Blockly.utils.IdGenerator.instance_ = new Blockly.utils.IdGenerator();
|
|
}
|
|
return Blockly.utils.IdGenerator.instance_;
|
|
};
|
|
|
|
/**
|
|
* Next unique ID to use
|
|
* @type {number}
|
|
* @private
|
|
*/
|
|
Blockly.utils.IdGenerator.prototype.nextId_ = 0;
|
|
|
|
/**
|
|
* Gets the next unique ID.
|
|
* The difference between this and genUid is that getNextUniqueId generates
|
|
* IDs compatible with the HTML4 id attribute restrictions:
|
|
* Use only ASCII letters, digits, '_', '-' and '.'
|
|
* @return {string} The next unique identifier.
|
|
*/
|
|
Blockly.utils.IdGenerator.prototype.getNextUniqueId = function() {
|
|
return 'blockly:' + (this.nextId_++).toString(36);
|
|
};
|