redux-form-validators/src/length.js

Simple validations with redux-form / react-final-form

import Validators from './validators'
import { prepareMsg, prepare, isNumber, selectNum, memoize } from './helpers'

let length = memoize(function ({
  '=': equal,
  is,
  max,
  maximum,
  min,
  minimum,
  in: range,
  within,
  message,
  msg,
  if: ifCond,
  unless,
  allowBlank
}) {
  msg = msg || message

  equal = selectNum(equal, is)
  min = selectNum(min, minimum)
  max = selectNum(max, maximum)

  range = range || within
  if (range && isNumber(range[0]) && isNumber(range[1])) {
    min = range[0]
    max = range[1]
  }

  return prepare(ifCond, unless, allowBlank, function (value) {
    if (equal !== null && value.length !== equal) {
      return Validators.formatMessage(prepareMsg(msg, 'wrongLength', 'is', '=', { count: equal }))
    }
    if (max !== null && value.length > max) {
      return Validators.formatMessage(prepareMsg(msg, 'tooLong', 'maximum', 'max', { count: max }))
    }
    if (min !== null && value.length < min) {
      return Validators.formatMessage(prepareMsg(msg, 'tooShort', 'minimum', 'min', { count: min }))
    }
  })
})

export default length