mirror of https://github.com/go-gorm/gorm.git
103 lines
1.8 KiB
Go
103 lines
1.8 KiB
Go
package gorm
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import (
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"bytes"
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"errors"
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"fmt"
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"reflect"
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"strings"
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"sync"
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)
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type safeMap struct {
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m map[string]string
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l *sync.RWMutex
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}
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func (s *safeMap) Set(key string, value string) {
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s.l.Lock()
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defer s.l.Unlock()
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s.m[key] = value
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}
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func (s *safeMap) Get(key string) string {
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s.l.RLock()
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defer s.l.RUnlock()
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return s.m[key]
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}
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func FieldValueByName(name string, value interface{}) (i interface{}, err error) {
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data := reflect.Indirect(reflect.ValueOf(value))
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name = SnakeToUpperCamel(name)
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if data.Kind() == reflect.Struct {
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if field := data.FieldByName(name); field.IsValid() {
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i = field.Interface()
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} else {
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return nil, errors.New(fmt.Sprintf("struct has no field with name %s", name))
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}
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} else {
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return nil, errors.New("value must be of kind struct")
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}
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return
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}
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func newSafeMap() *safeMap {
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return &safeMap{l: new(sync.RWMutex), m: make(map[string]string)}
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}
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var smap = newSafeMap()
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var umap = newSafeMap()
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func ToSnake(u string) string {
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if v := smap.Get(u); v != "" {
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return v
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}
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buf := bytes.NewBufferString("")
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for i, v := range u {
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if i > 0 && v >= 'A' && v <= 'Z' {
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buf.WriteRune('_')
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}
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buf.WriteRune(v)
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}
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s := strings.ToLower(buf.String())
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smap.Set(u, s)
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return s
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}
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func SnakeToUpperCamel(s string) string {
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if v := umap.Get(s); v != "" {
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return v
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}
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buf := bytes.NewBufferString("")
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for _, v := range strings.Split(s, "_") {
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if len(v) > 0 {
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buf.WriteString(strings.ToUpper(v[:1]))
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buf.WriteString(v[1:])
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}
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}
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u := buf.String()
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umap.Set(s, u)
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return u
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}
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func parseTagSetting(str string) map[string]string {
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tags := strings.Split(str, ";")
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setting := map[string]string{}
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for _, value := range tags {
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v := strings.Split(value, ":")
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k := strings.TrimSpace(strings.ToUpper(v[0]))
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if len(v) == 2 {
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setting[k] = v[1]
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} else {
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setting[k] = k
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}
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}
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return setting
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}
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