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// Copyright (C) 2016 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package util
import (
"fmt"
"net/url"
"reflect"
"sort"
"strconv"
"strings"
)
// SetDefaults sets default values on a struct, based on the default annotation.
func SetDefaults(data interface{}) error {
s := reflect.ValueOf(data).Elem()
t := s.Type()
for i := 0; i < s.NumField(); i++ {
f := s.Field(i)
tag := t.Field(i).Tag
v := tag.Get("default")
if len(v) > 0 {
if parser, ok := f.Interface().(interface {
ParseDefault(string) (interface{}, error)
}); ok {
val, err := parser.ParseDefault(v)
if err != nil {
panic(err)
}
f.Set(reflect.ValueOf(val))
continue
}
switch f.Interface().(type) {
case string:
f.SetString(v)
case int:
i, err := strconv.ParseInt(v, 10, 64)
if err != nil {
return err
}
f.SetInt(i)
case float64:
i, err := strconv.ParseFloat(v, 64)
if err != nil {
return err
}
f.SetFloat(i)
case bool:
f.SetBool(v == "true")
case []string:
// We don't do anything with string slices here. Any default
// we set will be appended to by the XML decoder, so we fill
// those after decoding.
default:
panic(f.Type())
}
}
}
return nil
}
// CopyMatchingTag copies fields tagged tag:"value" from "from" struct onto "to" struct.
func CopyMatchingTag(from interface{}, to interface{}, tag string, shouldCopy func(value string) bool) {
fromStruct := reflect.ValueOf(from).Elem()
fromType := fromStruct.Type()
toStruct := reflect.ValueOf(to).Elem()
toType := toStruct.Type()
if fromType != toType {
panic(fmt.Sprintf("non equal types: %s != %s", fromType, toType))
}
for i := 0; i < toStruct.NumField(); i++ {
fromField := fromStruct.Field(i)
toField := toStruct.Field(i)
if !toField.CanSet() {
// Unexported fields
continue
}
structTag := toType.Field(i).Tag
v := structTag.Get(tag)
if shouldCopy(v) {
toField.Set(fromField)
}
}
}
// UniqueStrings returns a list on unique strings, trimming and sorting them
// at the same time.
func UniqueStrings(ss []string) []string {
var m = make(map[string]bool, len(ss))
for _, s := range ss {
m[strings.Trim(s, " ")] = true
}
var us = make([]string, 0, len(m))
for k := range m {
us = append(us, k)
}
sort.Strings(us)
return us
}
// FillNilSlices sets default value on slices that are still nil.
func FillNilSlices(data interface{}) error {
s := reflect.ValueOf(data).Elem()
t := s.Type()
for i := 0; i < s.NumField(); i++ {
f := s.Field(i)
tag := t.Field(i).Tag
v := tag.Get("default")
if len(v) > 0 {
switch f.Interface().(type) {
case []string:
if f.IsNil() {
// Treat the default as a comma separated slice
vs := strings.Split(v, ",")
for i := range vs {
vs[i] = strings.TrimSpace(vs[i])
}
rv := reflect.MakeSlice(reflect.TypeOf([]string{}), len(vs), len(vs))
for i, v := range vs {
rv.Index(i).SetString(v)
}
f.Set(rv)
}
}
}
}
return nil
}
// Address constructs a URL from the given network and hostname.
func Address(network, host string) string {
u := url.URL{
Scheme: network,
Host: host,
}
return u.String()
}
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