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