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// Copyright 2013 The go-github AUTHORS. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package github
import (
"bytes"
"fmt"
"io"
"reflect"
)
var timestampType = reflect.TypeOf(Timestamp{})
// 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(w io.Writer, val reflect.Value) {
if val.Kind() == reflect.Ptr && val.IsNil() {
w.Write([]byte("<nil>"))
return
}
v := reflect.Indirect(val)
switch v.Kind() {
case reflect.String:
fmt.Fprintf(w, `"%s"`, v)
case reflect.Slice:
w.Write([]byte{'['})
for i := 0; i < v.Len(); i++ {
if i > 0 {
w.Write([]byte{' '})
}
stringifyValue(w, v.Index(i))
}
w.Write([]byte{']'})
return
case reflect.Struct:
if v.Type().Name() != "" {
w.Write([]byte(v.Type().String()))
}
// special handling of Timestamp values
if v.Type() == timestampType {
fmt.Fprintf(w, "{%s}", v.Interface())
return
}
w.Write([]byte{'{'})
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 {
w.Write([]byte(", "))
} else {
sep = true
}
w.Write([]byte(v.Type().Field(i).Name))
w.Write([]byte{':'})
stringifyValue(w, fv)
}
w.Write([]byte{'}'})
default:
if v.CanInterface() {
fmt.Fprint(w, v.Interface())
}
}
}
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