| 1 | /**
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| 2 | * @fileoverview UID generator, from Blockly.
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| 3 | */
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| 4 |
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| 5 | /**
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| 6 | * Legal characters for the unique ID.
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| 7 | * Should be all on a US keyboard. No XML special characters or control codes.
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| 8 | * Removed $ due to issue 251.
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| 9 | * @private
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| 10 | */
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| 11 | const soup_ = '!#%()*+,-./:;=?@[]^_`{|}~' +
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| 12 | 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
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| 13 |
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| 14 | /**
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| 15 | * Generate a unique ID, from Blockly. This should be globally unique.
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| 16 | * 87 characters ^ 20 length > 128 bits (better than a UUID).
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| 17 | * @return {string} A globally unique ID string.
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| 18 | */
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| 19 | const uid = function () {
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| 20 | const length = 20;
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| 21 | const soupLength = soup_.length;
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| 22 | const id = [];
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| 23 | for (let i = 0; i < length; i++) {
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| 24 | id[i] = soup_.charAt(Math.random() * soupLength);
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| 25 | }
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| 26 | return id.join('');
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| 27 | };
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| 28 |
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| 29 | module.exports = uid;
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