mirror of
https://github.com/astaxie/beego.git
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199 lines
3.9 KiB
Go
199 lines
3.9 KiB
Go
package validation
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import (
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"fmt"
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"reflect"
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"regexp"
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"strconv"
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"strings"
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)
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const (
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VALIDTAG = "valid"
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)
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var (
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// key: function name
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// value: the number of parameters
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funcs = make(Funcs)
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// doesn't belong to validation functions
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unFuncs = map[string]bool{
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"Clear": true,
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"HasErrors": true,
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"ErrorMap": true,
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"Error": true,
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"apply": true,
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"Check": true,
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"Valid": true,
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}
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)
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func init() {
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v := &Validation{}
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t := reflect.TypeOf(v)
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for i := 0; i < t.NumMethod(); i++ {
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m := t.Method(i)
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if !unFuncs[m.Name] {
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funcs[m.Name] = m.Func
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}
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}
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}
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type ValidFunc struct {
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Name string
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Params []interface{}
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}
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type Funcs map[string]reflect.Value
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func (f Funcs) Call(name string, params ...interface{}) (result []reflect.Value, err error) {
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defer func() {
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if r := recover(); r != nil {
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err = r.(error)
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}
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}()
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if _, ok := f[name]; !ok {
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err = fmt.Errorf("%s does not exist", name)
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return
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}
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if len(params) != f[name].Type().NumIn() {
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err = fmt.Errorf("The number of params is not adapted")
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return
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}
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in := make([]reflect.Value, len(params))
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for k, param := range params {
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in[k] = reflect.ValueOf(param)
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}
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result = f[name].Call(in)
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return
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}
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func isStruct(t reflect.Type) bool {
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return t.Kind() == reflect.Struct
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}
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func isStructPtr(t reflect.Type) bool {
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return t.Kind() == reflect.Ptr && t.Elem().Kind() == reflect.Struct
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}
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func getValidFuncs(f reflect.StructField) (vfs []ValidFunc, err error) {
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tag := f.Tag.Get(VALIDTAG)
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if len(tag) == 0 {
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return
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}
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fs := strings.Split(tag, ";")
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for _, vfunc := range fs {
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var vf ValidFunc
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vf, err = parseFunc(vfunc)
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if err != nil {
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return
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}
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vfs = append(vfs, vf)
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}
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return
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}
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func parseFunc(vfunc string) (v ValidFunc, err error) {
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defer func() {
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if r := recover(); r != nil {
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err = r.(error)
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}
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}()
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vfunc = strings.TrimSpace(vfunc)
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start := strings.Index(vfunc, "(")
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var num int
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// doesn't need parameter valid function
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if start == -1 {
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if num, err = numIn(vfunc); err != nil {
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return
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}
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if num != 0 {
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err = fmt.Errorf("%s require %d parameters", vfunc, num)
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return
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}
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v = ValidFunc{vfunc, []interface{}{vfunc}}
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return
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}
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end := strings.Index(vfunc, ")")
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if end == -1 {
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err = fmt.Errorf("invalid valid function")
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return
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}
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name := strings.TrimSpace(vfunc[:start])
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if num, err = numIn(name); err != nil {
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return
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}
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params := strings.Split(vfunc[start+1:end], ",")
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// the num of param must be equal
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if num != len(params) {
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err = fmt.Errorf("%s require %d parameters", name, num)
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return
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}
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tParams, err := trim(name, params)
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if err != nil {
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return
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}
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v = ValidFunc{name, tParams}
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return
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}
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func numIn(name string) (num int, err error) {
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fn, ok := funcs[name]
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if !ok {
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err = fmt.Errorf("doesn't exsits %s valid function", name)
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return
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}
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// sub *Validation obj and key
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num = fn.Type().NumIn() - 3
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return
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}
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func trim(name string, s []string) (ts []interface{}, err error) {
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ts = make([]interface{}, len(s), len(s)+1)
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fn, ok := funcs[name]
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if !ok {
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err = fmt.Errorf("doesn't exsits %s valid function", name)
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return
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}
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for i := 0; i < len(s); i++ {
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var param interface{}
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// skip *Validation and obj params
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if param, err = magic(fn.Type().In(i+2), strings.TrimSpace(s[i])); err != nil {
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return
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}
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ts[i] = param
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}
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ts = append(ts, name)
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return
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}
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// modify the parameters's type to adapt the function input parameters' type
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func magic(t reflect.Type, s string) (i interface{}, err error) {
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switch t.Kind() {
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case reflect.Int:
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i, err = strconv.Atoi(s)
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case reflect.String:
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i = s
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case reflect.Ptr:
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if t.Elem().String() != "regexp.Regexp" {
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err = fmt.Errorf("does not support %s", t.Elem().String())
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return
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}
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i, err = regexp.Compile(s)
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default:
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err = fmt.Errorf("does not support %s", t.Kind().String())
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}
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return
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}
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func mergeParam(v *Validation, obj interface{}, params []interface{}) []interface{} {
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return append([]interface{}{v, obj}, params...)
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}
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