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699 BJavaScriptView Raw
1'use strict';
2/**
3 * `input` type prompt
4 */
5
6const Input = require('./input');
7
8/**
9 * Extention of the Input prompt specifically for use with number inputs.
10 */
11
12class NumberPrompt extends Input {
13 filterInput(input) {
14 if (input && typeof input === 'string') {
15 input = input.trim();
16 // Match a number in the input
17 const numberMatch = input.match(/(^-?\d+|^\d+\.\d*|^\d*\.\d+)(e\d+)?$/);
18 // If a number is found, return that input.
19 if (numberMatch) {
20 return Number(numberMatch[0]);
21 }
22 }
23
24 // If the input was invalid return the default value.
25 return this.opt.default == null ? NaN : this.opt.default;
26 }
27}
28
29module.exports = NumberPrompt;