/usr/share/gocode/src/github.com/kr/pretty/diff.go is in golang-pretty-dev 0.0~git20130613-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | package pretty
import (
"fmt"
"io"
"reflect"
)
type sbuf []string
func (s *sbuf) Write(b []byte) (int, error) {
*s = append(*s, string(b))
return len(b), nil
}
// Diff returns a slice where each element describes
// a difference between a and b.
func Diff(a, b interface{}) (desc []string) {
Fdiff((*sbuf)(&desc), a, b)
return desc
}
// Fdiff writes to w a description of the differences between a and b.
func Fdiff(w io.Writer, a, b interface{}) {
diffWriter{w: w}.diff(reflect.ValueOf(a), reflect.ValueOf(b))
}
type diffWriter struct {
w io.Writer
l string // label
}
func (w diffWriter) printf(f string, a ...interface{}) {
var l string
if w.l != "" {
l = w.l + ": "
}
fmt.Fprintf(w.w, l+f, a...)
}
func (w diffWriter) diff(av, bv reflect.Value) {
if !av.IsValid() && bv.IsValid() {
w.printf("nil != %#v", bv.Interface())
return
}
if av.IsValid() && !bv.IsValid() {
w.printf("%#v != nil", av.Interface())
return
}
if !av.IsValid() && !bv.IsValid() {
return
}
at := av.Type()
bt := bv.Type()
if at != bt {
w.printf("%v != %v", at, bt)
return
}
// numeric types, including bool
if at.Kind() < reflect.Array {
a, b := av.Interface(), bv.Interface()
if a != b {
w.printf("%#v != %#v", a, b)
}
return
}
switch at.Kind() {
case reflect.String:
a, b := av.Interface(), bv.Interface()
if a != b {
w.printf("%q != %q", a, b)
}
case reflect.Ptr:
switch {
case av.IsNil() && !bv.IsNil():
w.printf("nil != %v", bv.Interface())
case !av.IsNil() && bv.IsNil():
w.printf("%v != nil", av.Interface())
case !av.IsNil() && !bv.IsNil():
w.diff(av.Elem(), bv.Elem())
}
case reflect.Struct:
for i := 0; i < av.NumField(); i++ {
w.relabel(at.Field(i).Name).diff(av.Field(i), bv.Field(i))
}
case reflect.Map:
ak, both, bk := keyDiff(av.MapKeys(), bv.MapKeys())
for _, k := range ak {
w := w.relabel(fmt.Sprintf("[%#v]", k.Interface()))
w.printf("%q != (missing)", av.MapIndex(k))
}
for _, k := range both {
w := w.relabel(fmt.Sprintf("[%#v]", k.Interface()))
w.diff(av.MapIndex(k), bv.MapIndex(k))
}
for _, k := range bk {
w := w.relabel(fmt.Sprintf("[%#v]", k.Interface()))
w.printf("(missing) != %q", bv.MapIndex(k))
}
case reflect.Interface:
w.diff(reflect.ValueOf(av.Interface()), reflect.ValueOf(bv.Interface()))
default:
if !reflect.DeepEqual(av.Interface(), bv.Interface()) {
w.printf("%# v != %# v", Formatter(av.Interface()), Formatter(bv.Interface()))
}
}
}
func (d diffWriter) relabel(name string) (d1 diffWriter) {
d1 = d
if d.l != "" && name[0] != '[' {
d1.l += "."
}
d1.l += name
return d1
}
func keyDiff(a, b []reflect.Value) (ak, both, bk []reflect.Value) {
for _, av := range a {
inBoth := false
for _, bv := range b {
if reflect.DeepEqual(av.Interface(), bv.Interface()) {
inBoth = true
both = append(both, av)
break
}
}
if !inBoth {
ak = append(ak, av)
}
}
for _, bv := range b {
inBoth := false
for _, av := range a {
if reflect.DeepEqual(av.Interface(), bv.Interface()) {
inBoth = true
break
}
}
if !inBoth {
bk = append(bk, bv)
}
}
return
}
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