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