forked from ebhomengo/niki
65 lines
1.9 KiB
Go
65 lines
1.9 KiB
Go
// 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
|
|
|
|
type stringValidator func(string) bool
|
|
|
|
// StringRule is a rule that checks a string variable using a specified stringValidator.
|
|
type StringRule struct {
|
|
validate stringValidator
|
|
err Error
|
|
}
|
|
|
|
// 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,
|
|
err: NewError("", message),
|
|
}
|
|
}
|
|
|
|
// NewStringRuleWithError 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 NewStringRuleWithError(validator stringValidator, err Error) StringRule {
|
|
return StringRule{
|
|
validate: validator,
|
|
err: err,
|
|
}
|
|
}
|
|
|
|
// Error sets the error message for the rule.
|
|
func (r StringRule) Error(message string) StringRule {
|
|
r.err = r.err.SetMessage(message)
|
|
return r
|
|
}
|
|
|
|
// ErrorObject sets the error struct for the rule.
|
|
func (r StringRule) ErrorObject(err Error) StringRule {
|
|
r.err = err
|
|
return r
|
|
}
|
|
|
|
// Validate checks if the given value is valid or not.
|
|
func (r 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 r.validate(str) {
|
|
return nil
|
|
}
|
|
|
|
return r.err
|
|
}
|