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namer.go
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/
namer.go
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package gowalker
import (
"reflect"
"strings"
)
type Namer interface {
Key(fs Fields) string
}
type appendNamer struct {
separator string
convFn func(string) string
}
func (a appendNamer) FieldKey(parent string, field reflect.StructField) string {
name := field.Name
if parent != "" {
if a.convFn != nil {
return parent + a.separator + a.convFn(name)
}
return parent + a.separator + name
}
if a.convFn != nil {
return a.convFn(name)
}
return name
}
func (a appendNamer) Key(fs Fields) string {
var key string
for _, f := range fs {
key = a.FieldKey(key, f)
}
return key
}
// Fullname namer.
func Fullname(sep string, convFn func(string) string) Namer {
return appendNamer{sep, convFn}
}
// UpperNamer - concat a uppercase parent's name with a uppercase child's one with underscore.
var UpperNamer = Fullname("_", strings.ToUpper)
// EnvNamer - STRUCT_FIELD naming.
var EnvNamer = UpperNamer
// StructFieldNamer - concat a parent's name with a child's one with dot.
var StructFieldNamer = Fullname(".", nil)
// DashToLoverNamer - concat a lowercase parent's name with a lowercase child's one with dash.
var DashToLoverNamer = Fullname("-", strings.ToLower)
// FlagNamer - struct-field naming.
var FlagNamer = DashToLoverNamer
var DefaultNamer = Fullname("", nil)