159 lines
3.4 KiB
Go
159 lines
3.4 KiB
Go
package annotation
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import (
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"encoding/json"
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"fmt"
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"reflect"
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"strings"
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cur "git.loafle.net/overflow/util-go/reflect"
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)
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type Registry interface {
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Register(t reflect.Type) error
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Get(f *reflect.StructField) (map[reflect.Type]Annotation, error)
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}
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var SystemRegistry = &AnnotationRegistry{
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parent: nil,
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definitions: make(map[string]*Definition, 0),
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}
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func New(parent Registry) Registry {
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r := &AnnotationRegistry{
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parent: parent,
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definitions: make(map[string]*Definition, 0),
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}
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if nil == r.parent {
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r.parent = SystemRegistry
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}
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return r
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}
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type AnnotationRegistry struct {
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parent Registry
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definitions map[string]*Definition
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}
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func Register(t reflect.Type) error {
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return SystemRegistry.Register(t)
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}
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func (r *AnnotationRegistry) Register(t reflect.Type) error {
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rt, _, _ := cur.GetTypeInfo(t)
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fields := findAnnotatedFields(t, AnnotationType, false)
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switch len(fields) {
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case 0:
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return fmt.Errorf("type[%s] is not Annotation", rt.Name())
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case 1:
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default:
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return fmt.Errorf("type[%s] have only one Annotation", rt.Name())
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}
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f := fields[AnnotationName]
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name := strings.TrimSpace(f.Tag.Get(NameTag))
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if "" == name {
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return fmt.Errorf("annotation name of type[%s] is not valid", rt.Name())
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}
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if _, ok := r.definitions[name]; ok {
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return fmt.Errorf("name[%s] of annotation exist already", name)
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}
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r.definitions[name] = &Definition{
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t: t,
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rt: rt,
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}
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return nil
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}
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func Get(f *reflect.StructField) (map[reflect.Type]Annotation, error) {
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return SystemRegistry.Get(f)
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}
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func (r *AnnotationRegistry) Get(f *reflect.StructField) (map[reflect.Type]Annotation, error) {
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annotations := make(map[reflect.Type]Annotation, 0)
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tag := strings.TrimSpace(f.Tag.Get(AnnotationTag))
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if "" == tag {
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return annotations, nil
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}
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if !AnnotationRGX.MatchString(tag) {
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return nil, fmt.Errorf("Tag of annotation[%s] is not match", tag)
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}
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rss := AnnotationRGX.FindAllStringSubmatch(tag, -1)
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if nil == rss || 0 == len(rss) {
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return annotations, nil
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}
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for _, rs := range rss {
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if 3 != len(rs) {
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return nil, fmt.Errorf("Tag of annotation[%s] is not valid", rs[0])
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}
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name := fmt.Sprintf("@%s", strings.TrimSpace(rs[1]))
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body := rs[2]
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if !AnnotationBodyRGX.MatchString(body) {
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return nil, fmt.Errorf("Body[%s] of annotation[%s] is not valid", body, name)
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}
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body = AnnotationBodyRGX.ReplaceAllStringFunc(body, func(token string) string {
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switch len(token) {
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case 0, 1, 2:
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return "\"\""
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default:
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return strings.Replace(fmt.Sprintf("\"%s\"", token[1:len(token)-1]), "\\'", "'", -1)
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}
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})
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body = fmt.Sprintf("{%s}", strings.TrimSpace(body))
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def, ok := r.definitions[name]
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if !ok {
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return nil, fmt.Errorf("annotation[%s] is not exist", name)
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}
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v := reflect.New(def.rt)
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i := v.Interface()
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err := json.Unmarshal([]byte(body), i)
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if nil != err {
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return nil, fmt.Errorf("Unmarshal failed %v", err)
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}
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annotations[def.t] = i
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}
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return annotations, nil
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}
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func findAnnotatedFields(t reflect.Type, ft reflect.Type, deep bool) map[string]*reflect.StructField {
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fields := make(map[string]*reflect.StructField, 0)
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rt, _, _ := cur.GetTypeInfo(t)
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if reflect.Struct != rt.Kind() {
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return fields
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}
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LOOP:
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for i := 0; i < rt.NumField(); i++ {
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f := rt.Field(i)
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if f.Anonymous {
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if f.Type == ft {
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fields[f.Name] = &f
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continue LOOP
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}
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if deep {
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_fields := findAnnotatedFields(f.Type, ft, deep)
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for _n, _f := range _fields {
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fields[_n] = _f
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}
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}
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}
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}
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return fields
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}
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