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//
// Copyright 2017, Sander van Harmelen
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package gitlab
import (
"bytes"
"fmt"
"reflect"
)
// Stringify attempts to create a reasonable string representation of types in
// the GitHub library. It does things like resolve pointers to their values
// and omits struct fields with nil values.
func Stringify(message interface{}) string {
var buf bytes.Buffer
v := reflect.ValueOf(message)
stringifyValue(&buf, v)
return buf.String()
}
// stringifyValue was heavily inspired by the goprotobuf library.
func stringifyValue(buf *bytes.Buffer, val reflect.Value) {
if val.Kind() == reflect.Ptr && val.IsNil() {
buf.WriteString("<nil>")
return
}
v := reflect.Indirect(val)
switch v.Kind() {
case reflect.String:
fmt.Fprintf(buf, `"%s"`, v)
case reflect.Slice:
buf.WriteByte('[')
for i := 0; i < v.Len(); i++ {
if i > 0 {
buf.WriteByte(' ')
}
stringifyValue(buf, v.Index(i))
}
buf.WriteByte(']')
return
case reflect.Struct:
if v.Type().Name() != "" {
buf.WriteString(v.Type().String())
}
buf.WriteByte('{')
var sep bool
for i := 0; i < v.NumField(); i++ {
fv := v.Field(i)
if fv.Kind() == reflect.Ptr && fv.IsNil() {
continue
}
if fv.Kind() == reflect.Slice && fv.IsNil() {
continue
}
if sep {
buf.WriteString(", ")
} else {
sep = true
}
buf.WriteString(v.Type().Field(i).Name)
buf.WriteByte(':')
stringifyValue(buf, fv)
}
buf.WriteByte('}')
default:
if v.CanInterface() {
fmt.Fprint(buf, v.Interface())
}
}
}
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