niki/vendor/github.com/go-ozzo/ozzo-validation/string.go

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2024-02-18 10:42:21 +00:00
// Copyright 2016 Qiang Xue. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package validation
import "errors"
type stringValidator func(string) bool
// StringRule is a rule that checks a string variable using a specified stringValidator.
type StringRule struct {
validate stringValidator
message string
}
// NewStringRule creates a new validation rule using a function that takes a string value and returns a bool.
// The rule returned will use the function to check if a given string or byte slice is valid or not.
// An empty value is considered to be valid. Please use the Required rule to make sure a value is not empty.
func NewStringRule(validator stringValidator, message string) *StringRule {
return &StringRule{
validate: validator,
message: message,
}
}
// Error sets the error message for the rule.
func (v *StringRule) Error(message string) *StringRule {
return NewStringRule(v.validate, message)
}
// Validate checks if the given value is valid or not.
func (v *StringRule) Validate(value interface{}) error {
value, isNil := Indirect(value)
if isNil || IsEmpty(value) {
return nil
}
str, err := EnsureString(value)
if err != nil {
return err
}
if v.validate(str) {
return nil
}
return errors.New(v.message)
}