60 lines
1.5 KiB
JavaScript
60 lines
1.5 KiB
JavaScript
const Base = require('./base.js')
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const util = require('util')
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/**
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* @implements {Base}
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*/
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class TypeString extends Base {
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constructor () {
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super()
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this._type = 'string'
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this._max = null
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this._min = null
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this._empty = false
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}
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/**
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* set min length
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* @param {number} num
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*/
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min (num) {
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if (!isFinite(num) || num === true || num === false) throw new Error('input wrong')
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if (this._max !== null && this._max <= num) throw new Error(`num >= ${this._max}`)
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this._min = parseFloat(num)
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return this
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}
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/**
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* set max length
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* @param {number} num
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*/
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max (num) {
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if (!isFinite(num) || num === true || num === false) throw new Error('input wrong')
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if (this._min !== null && this._min >= num) throw new Error(`num <= ${this._min}`)
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this._max = parseFloat(num)
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return this
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}
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/**
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* set allow empty
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*/
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empty () {
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this._empty = true
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return this
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}
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validate (value) {
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if (value === undefined && this._required) return `required`
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if (value === undefined) return null
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/* eslint-disable-next-line */
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if (typeof value !== this._type) return `${util.inspect(value, false, null)} type not ${this._type}`
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if (!this._empty && !value) return `value empty`
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const len = value.length
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if (this._min !== null && len < this._min) return `value length < ${this._min}`
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if (this._max !== null && len > this._max) return `value length > ${this._max}`
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return null
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}
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}
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module.exports = TypeString
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