mktemp/src/unique_name.js

mktemp command for node.js

"use strict";
/**
 * @file generate unique name
 */
Object.defineProperty(exports, "__esModule", { value: true });
const placeholder = /(X+)[^X]*$/;
const table = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
const tableLength = table.length;
/**
 * count the number of possible outcomes for the template
 *
 * @param {string} template template string
 * @throws {TypeError} if template is not a string
 * @return {number} count of possible outcomes
 */
function getOutcomeCount(template) {
    if (typeof template !== 'string') {
        throw new TypeError(`template must be a string: ${template}`);
    }
    const matches = template.match(placeholder);
    if (matches === null) {
        return 1;
    }
    return Math.pow(tableLength, matches[1].length);
}
exports.getOutcomeCount = getOutcomeCount;
/**
 * generate unique name
 *
 * @param {string} template template string
 * @throws {TypeError} if template is not a string
 * @return {string} unique name string
 */
function generate(template) {
    if (typeof template !== 'string') {
        throw new TypeError(`template must be a string: ${template}`);
    }
    const matches = template.match(placeholder);
    if (matches === null) {
        return template;
    }
    const result = [];
    for (let i = 0, len = matches[1].length; i < len; ++i) {
        result.push(table[Math.floor(Math.random() * tableLength)]);
    }
    const { index: matchesIndex = 0 } = matches;
    return (template.slice(0, matchesIndex) +
        result.join('') +
        template.slice(matchesIndex + result.length));
}
exports.generate = generate;
//# sourceMappingURL=unique_name.js.map