Validation

Prologue provides lots of helper functions for validating data from users.

Single Record

Each helper function could be used directly, for examples you want to check whether the content of a string is an int.

import prologue/validate/validate

let
  msg = "Int required"
  checkInt = isInt(msg)

doAssert checkInt("12") == (true, "")
doAssert checkInt("912.6") == (false, msg)

Multiple Records

You could also check whether multiple records meets the requirements.

import prologue/validate/validate
import strtabs

var form = newFormValidation({
      "accepted": @[required(), accepted()],
      "required": @[required()],
      "requiredInt": @[required(), isInt()],
      "minValue": @[required(), isInt(), minValue(12), maxValue(19)]
    })
let
  chk1 = form.validate({"required": "on", "accepted": "true",
      "requiredInt": "12", "minValue": "15"}.newStringTable)
  chk2 = form.validate({"required": "on", "time": "555",
      "minValue": "10"}.newStringTable)
  chk3 = form.validate({"required": "on", "time": "555",
      "minValue": "10"}.newStringTable, allMsgs = false)
  chk4 = form.validate({"required": "on", "accepted": "true",
  "requiredInt": "12.5", "minValue": "13"}.newStringTable, allMsgs = false)

doAssert chk1 == (true, "")
doAssert not chk2.hasValue
doAssert chk2.msg == "Can\'t find key: accepted\nCan\'t find key: " &
        "required\nCan\'t find key: requiredInt\n10 is not greater than or equal to 12.0!\n"
doAssert not chk3.hasValue
doAssert chk3.msg == "Can\'t find key: accepted\n"
doAssert not chk4.hasValue
doAssert chk4.msg == "12.5 is not an integer!\n"