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gitea/vendor/github.com/kr/pretty/diff.go

265 lines
6.4 KiB

package pretty
import (
"fmt"
"io"
"reflect"
)
type sbuf []string
func (p *sbuf) Printf(format string, a ...interface{}) {
s := fmt.Sprintf(format, a...)
*p = append(*p, s)
}
// Diff returns a slice where each element describes
// a difference between a and b.
func Diff(a, b interface{}) (desc []string) {
Pdiff((*sbuf)(&desc), a, b)
return desc
}
// wprintfer calls Fprintf on w for each Printf call
// with a trailing newline.
type wprintfer struct{ w io.Writer }
func (p *wprintfer) Printf(format string, a ...interface{}) {
fmt.Fprintf(p.w, format+"\n", a...)
}
// Fdiff writes to w a description of the differences between a and b.
func Fdiff(w io.Writer, a, b interface{}) {
Pdiff(&wprintfer{w}, a, b)
}
type Printfer interface {
Printf(format string, a ...interface{})
}
// Pdiff prints to p a description of the differences between a and b.
// It calls Printf once for each difference, with no trailing newline.
// The standard library log.Logger is a Printfer.
func Pdiff(p Printfer, a, b interface{}) {
diffPrinter{w: p}.diff(reflect.ValueOf(a), reflect.ValueOf(b))
}
type Logfer interface {
Logf(format string, a ...interface{})
}
// logprintfer calls Fprintf on w for each Printf call
// with a trailing newline.
type logprintfer struct{ l Logfer }
func (p *logprintfer) Printf(format string, a ...interface{}) {
p.l.Logf(format, a...)
}
// Ldiff prints to l a description of the differences between a and b.
// It calls Logf once for each difference, with no trailing newline.
// The standard library testing.T and testing.B are Logfers.
func Ldiff(l Logfer, a, b interface{}) {
Pdiff(&logprintfer{l}, a, b)
}
type diffPrinter struct {
w Printfer
l string // label
}
func (w diffPrinter) printf(f string, a ...interface{}) {
var l string
if w.l != "" {
l = w.l + ": "
}
w.w.Printf(l+f, a...)
}
func (w diffPrinter) diff(av, bv reflect.Value) {
if !av.IsValid() && bv.IsValid() {
w.printf("nil != %# v", formatter{v: bv, quote: true})
return
}
if av.IsValid() && !bv.IsValid() {
w.printf("%# v != nil", formatter{v: av, quote: true})
return
}
if !av.IsValid() && !bv.IsValid() {
return
}
at := av.Type()
bt := bv.Type()
if at != bt {
w.printf("%v != %v", at, bt)
return
}
switch kind := at.Kind(); kind {
case reflect.Bool:
if a, b := av.Bool(), bv.Bool(); a != b {
w.printf("%v != %v", a, b)
}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
if a, b := av.Int(), bv.Int(); a != b {
w.printf("%d != %d", a, b)
}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
if a, b := av.Uint(), bv.Uint(); a != b {
w.printf("%d != %d", a, b)
}
case reflect.Float32, reflect.Float64:
if a, b := av.Float(), bv.Float(); a != b {
w.printf("%v != %v", a, b)
}
case reflect.Complex64, reflect.Complex128:
if a, b := av.Complex(), bv.Complex(); a != b {
w.printf("%v != %v", a, b)
}
case reflect.Array:
n := av.Len()
for i := 0; i < n; i++ {
w.relabel(fmt.Sprintf("[%d]", i)).diff(av.Index(i), bv.Index(i))
}
case reflect.Chan, reflect.Func, reflect.UnsafePointer:
if a, b := av.Pointer(), bv.Pointer(); a != b {
w.printf("%#x != %#x", a, b)
}
case reflect.Interface:
w.diff(av.Elem(), bv.Elem())
case reflect.Map:
ak, both, bk := keyDiff(av.MapKeys(), bv.MapKeys())
for _, k := range ak {
w := w.relabel(fmt.Sprintf("[%#v]", k))
w.printf("%q != (missing)", av.MapIndex(k))
}
for _, k := range both {
w := w.relabel(fmt.Sprintf("[%#v]", k))
w.diff(av.MapIndex(k), bv.MapIndex(k))
}
for _, k := range bk {
w := w.relabel(fmt.Sprintf("[%#v]", k))
w.printf("(missing) != %q", bv.MapIndex(k))
}
case reflect.Ptr:
switch {
case av.IsNil() && !bv.IsNil():
w.printf("nil != %# v", formatter{v: bv, quote: true})
case !av.IsNil() && bv.IsNil():
w.printf("%# v != nil", formatter{v: av, quote: true})
case !av.IsNil() && !bv.IsNil():
w.diff(av.Elem(), bv.Elem())
}
case reflect.Slice:
lenA := av.Len()
lenB := bv.Len()
if lenA != lenB {
w.printf("%s[%d] != %s[%d]", av.Type(), lenA, bv.Type(), lenB)
break
}
for i := 0; i < lenA; i++ {
w.relabel(fmt.Sprintf("[%d]", i)).diff(av.Index(i), bv.Index(i))
}
case reflect.String:
if a, b := av.String(), bv.String(); a != b {
w.printf("%q != %q", a, b)
}
case reflect.Struct:
for i := 0; i < av.NumField(); i++ {
w.relabel(at.Field(i).Name).diff(av.Field(i), bv.Field(i))
}
default:
panic("unknown reflect Kind: " + kind.String())
}
}
func (d diffPrinter) relabel(name string) (d1 diffPrinter) {
d1 = d
if d.l != "" && name[0] != '[' {
d1.l += "."
}
d1.l += name
return d1
}
// keyEqual compares a and b for equality.
// Both a and b must be valid map keys.
func keyEqual(av, bv reflect.Value) bool {
if !av.IsValid() && !bv.IsValid() {
return true
}
if !av.IsValid() || !bv.IsValid() || av.Type() != bv.Type() {
return false
}
switch kind := av.Kind(); kind {
case reflect.Bool:
a, b := av.Bool(), bv.Bool()
return a == b
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
a, b := av.Int(), bv.Int()
return a == b
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
a, b := av.Uint(), bv.Uint()
return a == b
case reflect.Float32, reflect.Float64:
a, b := av.Float(), bv.Float()
return a == b
case reflect.Complex64, reflect.Complex128:
a, b := av.Complex(), bv.Complex()
return a == b
case reflect.Array:
for i := 0; i < av.Len(); i++ {
if !keyEqual(av.Index(i), bv.Index(i)) {
return false
}
}
return true
case reflect.Chan, reflect.UnsafePointer, reflect.Ptr:
a, b := av.Pointer(), bv.Pointer()
return a == b
case reflect.Interface:
return keyEqual(av.Elem(), bv.Elem())
case reflect.String:
a, b := av.String(), bv.String()
return a == b
case reflect.Struct:
for i := 0; i < av.NumField(); i++ {
if !keyEqual(av.Field(i), bv.Field(i)) {
return false
}
}
return true
default:
panic("invalid map key type " + av.Type().String())
}
}
func keyDiff(a, b []reflect.Value) (ak, both, bk []reflect.Value) {
for _, av := range a {
inBoth := false
for _, bv := range b {
if keyEqual(av, bv) {
inBoth = true
both = append(both, av)
break
}
}
if !inBoth {
ak = append(ak, av)
}
}
for _, bv := range b {
inBoth := false
for _, av := range a {
if keyEqual(av, bv) {
inBoth = true
break
}
}
if !inBoth {
bk = append(bk, bv)
}
}
return
}