Documentation ¶
Overview ¶
Package validator is a powerful validator that supports struct tag expression.
Copyright 2019 Bytedance Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
Example ¶
package main import ( "fmt" "github.com/bytedance/go-tagexpr/validator" ) func main() { var vd = validator.New("vd") type InfoRequest struct { Name string `vd:"($!='Alice'||(Age)$==18) && regexp('\\w')"` Age int `vd:"$>0"` } info := &InfoRequest{Name: "Alice", Age: 18} fmt.Println(vd.Validate(info) == nil) type A struct { A int `vd:"$<0||$>=100"` } a := &A{107} fmt.Println(vd.Validate(a) == nil) type B struct { B string `vd:"len($)>1 && regexp('^\\w*$')"` } b := &B{"abc"} fmt.Println(vd.Validate(b) == nil) type C struct { C bool `vd:"{@:(S.A)$>0 && !$}{msg:'C must be false when S.A>0'}"` S *A } c := &C{C: true, S: a} fmt.Println(vd.Validate(c)) type D struct { d []string `vd:"{@:len($)>0 && $[0]=='D'} {msg:sprintf('invalid d: %v',$)}"` } d := &D{d: []string{"x", "y"}} fmt.Println(vd.Validate(d)) type E struct { e map[string]int `vd:"len($)==$['len']"` } e := &E{map[string]int{"len": 2}} fmt.Println(vd.Validate(e)) // Customizes the factory of validation error. vd.SetErrorFactory(func(fieldSelector, msg string) error { return fmt.Errorf(`{"succ":false, "error":"invalid parameter: %s"}`, fieldSelector) }) type F struct { f struct { g int `vd:"$%3==0"` } } f := &F{} f.f.g = 10 fmt.Println(vd.Validate(f)) }
Output: true true true C must be false when S.A>0 invalid d: [x y] invalid parameter: e {"succ":false, "error":"invalid parameter: f.g"}
Index ¶
Examples ¶
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type Validator ¶
type Validator struct {
// contains filtered or unexported fields
}
Validator struct fields validator
func (*Validator) SetErrorFactory ¶
SetErrorFactory customizes the factory of validation error.