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// Copyright 2019, The Go 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 cmp_test
import (
"fmt"
"strings"
"github.com/google/go-cmp/cmp"
)
// DiffReporter is a simple custom reporter that only records differences
// detected during comparison.
type DiffReporter struct {
path cmp.Path
diffs []string
}
func (r *DiffReporter) PushStep(ps cmp.PathStep) {
r.path = append(r.path, ps)
}
func (r *DiffReporter) Report(rs cmp.Result) {
if !rs.Equal() {
vx, vy := r.path.Last().Values()
r.diffs = append(r.diffs, fmt.Sprintf("%#v:\n\t-: %+v\n\t+: %+v\n", r.path, vx, vy))
}
}
func (r *DiffReporter) PopStep() {
r.path = r.path[:len(r.path)-1]
}
func (r *DiffReporter) String() string {
return strings.Join(r.diffs, "\n")
}
func ExampleReporter() {
x, y := MakeGatewayInfo()
var r DiffReporter
cmp.Equal(x, y, cmp.Reporter(&r))
fmt.Print(r.String())
// Output:
// {cmp_test.Gateway}.IPAddress:
// -: 192.168.0.1
// +: 192.168.0.2
//
// {cmp_test.Gateway}.Clients[4].IPAddress:
// -: 192.168.0.219
// +: 192.168.0.221
//
// {cmp_test.Gateway}.Clients[5->?]:
// -: {Hostname:americano IPAddress:192.168.0.188 LastSeen:2009-11-10 23:03:05 +0000 UTC}
// +: <invalid reflect.Value>
}
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