valiwork/example/main.go

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// Valiwork - validations that works.
// Copyright (c) 2020 by Stanislav Nikitin <pztrn@pztrn.name>
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package main
import (
"strings"
// stdlib
"errors"
"log"
// other
"go.dev.pztrn.name/valiwork"
)
const (
stringValidatorName = "string_validate_things"
)
func main() {
log.Println("Starting validation example...")
log.Println("WARN: to see additional valiwork output define 'VALIWORK_DEBUG' environment variable and set it to 'true'!")
//stringToValidate := " I am pretty b@d $tring"
_ = valiwork.RegisterValidator(stringValidatorName, stringValidator)
}
func stringValidator(thing interface{}, optional ...interface{}) []interface{} {
var errs []interface{}
stringToValidate, ok := thing.(string)
if !ok {
errs = append(errs, errors.New("passed value is not a string"))
return errs
}
// Are string begins with spaces?
if strings.HasPrefix(stringToValidate, " ") {
errs = append(errs, errors.New("string begins with space"))
}
// Does string contains any special characters?
return errs
}