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number.js
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Mon, Jul 14, 17:00

number.js
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const color = require('kleur');
const Prompt = require('./prompt');
const { cursor, erase } = require('sisteransi');
const { style, figures, clear, lines } = require('../util');
const isNumber = /[0-9]/;
const isDef = any => any !== undefined;
const round = (number, precision) => {
let factor = Math.pow(10, precision);
return Math.round(number * factor) / factor;
}
/**
* NumberPrompt Base Element
* @param {Object} opts Options
* @param {String} opts.message Message
* @param {String} [opts.style='default'] Render style
* @param {Number} [opts.initial] Default value
* @param {Number} [opts.max=+Infinity] Max value
* @param {Number} [opts.min=-Infinity] Min value
* @param {Boolean} [opts.float=false] Parse input as floats
* @param {Number} [opts.round=2] Round floats to x decimals
* @param {Number} [opts.increment=1] Number to increment by when using arrow-keys
* @param {Function} [opts.validate] Validate function
* @param {Stream} [opts.stdin] The Readable stream to listen to
* @param {Stream} [opts.stdout] The Writable stream to write readline data to
* @param {String} [opts.error] The invalid error label
*/
class NumberPrompt extends Prompt {
constructor(opts={}) {
super(opts);
this.transform = style.render(opts.style);
this.msg = opts.message;
this.initial = isDef(opts.initial) ? opts.initial : '';
this.float = !!opts.float;
this.round = opts.round || 2;
this.inc = opts.increment || 1;
this.min = isDef(opts.min) ? opts.min : -Infinity;
this.max = isDef(opts.max) ? opts.max : Infinity;
this.errorMsg = opts.error || `Please Enter A Valid Value`;
this.validator = opts.validate || (() => true);
this.color = `cyan`;
this.value = ``;
this.typed = ``;
this.lastHit = 0;
this.render();
}
set value(v) {
if (!v && v !== 0) {
this.placeholder = true;
this.rendered = color.gray(this.transform.render(`${this.initial}`));
this._value = ``;
} else {
this.placeholder = false;
this.rendered = this.transform.render(`${round(v, this.round)}`);
this._value = round(v, this.round);
}
this.fire();
}
get value() {
return this._value;
}
parse(x) {
return this.float ? parseFloat(x) : parseInt(x);
}
valid(c) {
return c === `-` || c === `.` && this.float || isNumber.test(c)
}
reset() {
this.typed = ``;
this.value = ``;
this.fire();
this.render();
}
exit() {
this.abort();
}
abort() {
let x = this.value;
this.value = x !== `` ? x : this.initial;
this.done = this.aborted = true;
this.error = false;
this.fire();
this.render();
this.out.write(`\n`);
this.close();
}
async validate() {
let valid = await this.validator(this.value);
if (typeof valid === `string`) {
this.errorMsg = valid;
valid = false;
}
this.error = !valid;
}
async submit() {
await this.validate();
if (this.error) {
this.color = `red`;
this.fire();
this.render();
return;
}
let x = this.value;
this.value = x !== `` ? x : this.initial;
this.done = true;
this.aborted = false;
this.error = false;
this.fire();
this.render();
this.out.write(`\n`);
this.close();
}
up() {
this.typed = ``;
if(this.value === '') {
this.value = this.min - this.inc;
}
if (this.value >= this.max) return this.bell();
this.value += this.inc;
this.color = `cyan`;
this.fire();
this.render();
}
down() {
this.typed = ``;
if(this.value === '') {
this.value = this.min + this.inc;
}
if (this.value <= this.min) return this.bell();
this.value -= this.inc;
this.color = `cyan`;
this.fire();
this.render();
}
delete() {
let val = this.value.toString();
if (val.length === 0) return this.bell();
this.value = this.parse((val = val.slice(0, -1))) || ``;
if (this.value !== '' && this.value < this.min) {
this.value = this.min;
}
this.color = `cyan`;
this.fire();
this.render();
}
next() {
this.value = this.initial;
this.fire();
this.render();
}
_(c, key) {
if (!this.valid(c)) return this.bell();
const now = Date.now();
if (now - this.lastHit > 1000) this.typed = ``; // 1s elapsed
this.typed += c;
this.lastHit = now;
this.color = `cyan`;
if (c === `.`) return this.fire();
this.value = Math.min(this.parse(this.typed), this.max);
if (this.value > this.max) this.value = this.max;
if (this.value < this.min) this.value = this.min;
this.fire();
this.render();
}
render() {
if (this.closed) return;
if (!this.firstRender) {
if (this.outputError)
this.out.write(cursor.down(lines(this.outputError, this.out.columns) - 1) + clear(this.outputError, this.out.columns));
this.out.write(clear(this.outputText, this.out.columns));
}
super.render();
this.outputError = '';
// Print prompt
this.outputText = [
style.symbol(this.done, this.aborted),
color.bold(this.msg),
style.delimiter(this.done),
!this.done || (!this.done && !this.placeholder)
? color[this.color]().underline(this.rendered) : this.rendered
].join(` `);
// Print error
if (this.error) {
this.outputError += this.errorMsg.split(`\n`)
.reduce((a, l, i) => a + `\n${i ? ` ` : figures.pointerSmall} ${color.red().italic(l)}`, ``);
}
this.out.write(erase.line + cursor.to(0) + this.outputText + cursor.save + this.outputError + cursor.restore);
}
}
module.exports = NumberPrompt;

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