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querystring.go
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/
querystring.go
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package httpparser
import (
"fmt"
"net/url"
"reflect"
)
// QueryString turns a struct into url.Values
func QueryString(v interface{}) (url.Values, error) {
values := make(url.Values)
val := reflect.ValueOf(v)
for val.Kind() == reflect.Ptr {
if val.IsNil() {
return values, nil
}
val = val.Elem()
}
if v == nil {
return values, nil
}
if val.Kind() != reflect.Struct {
return nil, fmt.Errorf("querystring: Values() expects struct input. Got %v", val.Kind())
}
err := reflectQueryString(values, val, "")
return values, err
}
func reflectQueryString(values url.Values, val reflect.Value, scope string) error {
var embedded []reflect.Value
typ := val.Type()
for i := 0; i < typ.NumField(); i++ {
sf := typ.Field(i)
if sf.PkgPath != "" && !sf.Anonymous { // unexported
continue
}
sv := val.Field(i)
tag := sf.Tag.Get(querystringTag)
if tag == skipTag {
continue
}
name, opts := parseTag(tag)
if name == emptyTag {
if sf.Anonymous && sv.Kind() == reflect.Struct {
// save embedded struct for later processing
embedded = append(embedded, sv)
continue
}
name = sf.Name
}
if scope != "" {
name = scope + "[" + name + "]"
}
if opts.Contains(omitemptyTag) && sv.Kind() == reflect.Bool {
return fmt.Errorf("header: bool value can not be omitempty")
}
if opts.Contains(omitemptyTag) && isEmpty(sv) {
continue
}
for sv.Kind() == reflect.Ptr {
if sv.IsNil() {
break
}
sv = sv.Elem()
}
if sv.Type() == timeType {
values.Add(name, toString(sv, opts))
continue
}
if sv.Kind() == reflect.Struct {
reflectQueryString(values, sv, name)
continue
}
values.Add(name, toString(sv, opts))
}
for _, f := range embedded {
if err := reflectQueryString(values, f, scope); err != nil {
return err
}
}
return nil
}