// Copyright 2018 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 fmtsort_test
import (
"fmt"
"internal/fmtsort"
"math"
"reflect"
"strings"
"testing"
)
var compareTests = [][]reflect.Value{
ct(reflect.TypeOf(int(0)), -1, 0, 1),
ct(reflect.TypeOf(int8(0)), -1, 0, 1),
ct(reflect.TypeOf(int16(0)), -1, 0, 1),
ct(reflect.TypeOf(int32(0)), -1, 0, 1),
ct(reflect.TypeOf(int64(0)), -1, 0, 1),
ct(reflect.TypeOf(uint(0)), 0, 1, 5),
ct(reflect.TypeOf(uint8(0)), 0, 1, 5),
ct(reflect.TypeOf(uint16(0)), 0, 1, 5),
ct(reflect.TypeOf(uint32(0)), 0, 1, 5),
ct(reflect.TypeOf(uint64(0)), 0, 1, 5),
ct(reflect.TypeOf(uintptr(0)), 0, 1, 5),
ct(reflect.TypeOf(string("")), "", "a", "ab"),
ct(reflect.TypeOf(float32(0)), math.NaN(), math.Inf(-1), -1e10, 0, 1e10, math.Inf(1)),
ct(reflect.TypeOf(float64(0)), math.NaN(), math.Inf(-1), -1e10, 0, 1e10, math.Inf(1)),
ct(reflect.TypeOf(complex64(0+1i)), -1-1i, -1+0i, -1+1i, 0-1i, 0+0i, 0+1i, 1-1i, 1+0i, 1+1i),
ct(reflect.TypeOf(complex128(0+1i)), -1-1i, -1+0i, -1+1i, 0-1i, 0+0i, 0+1i, 1-1i, 1+0i, 1+1i),
ct(reflect.TypeOf(false), false, true),
ct(reflect.TypeOf(&ints[0]), &ints[0], &ints[1], &ints[2]),
ct(reflect.TypeOf(chans[0]), chans[0], chans[1], chans[2]),
ct(reflect.TypeOf(toy{}), toy{0, 1}, toy{0, 2}, toy{1, -1}, toy{1, 1}),
ct(reflect.TypeOf([2]int{}), [2]int{1, 1}, [2]int{1, 2}, [2]int{2, 0}),
ct(reflect.TypeOf(interface{}(interface{}(0))), iFace, 1, 2, 3),
}
var iFace interface{}
func ct(typ reflect.Type, args ...interface{}) []reflect.Value {
value := make([]reflect.Value, len(args))
for i, v := range args {
x := reflect.ValueOf(v)
if !x.IsValid() { // Make it a typed nil.
x = reflect.Zero(typ)
} else {
x = x.Convert(typ)
}
value[i] = x
}
return value
}
func TestCompare(t *testing.T) {
for _, test := range compareTests {
for i, v0 := range test {
for j, v1 := range test {
c := fmtsort.Compare(v0, v1)
var expect int
switch {
case i == j:
expect = 0
// NaNs are tricky.
if typ := v0.Type(); (typ.Kind() == reflect.Float32 || typ.Kind() == reflect.Float64) && math.IsNaN(v0.Float()) {
expect = -1
}
case i < j:
expect = -1
case i > j:
expect = 1
}
if c != expect {
t.Errorf("%s: compare(%v,%v)=%d; expect %d", v0.Type(), v0, v1, c, expect)
}
}
}
}
}
type sortTest struct {
data interface{} // Always a map.
print string // Printed result using our custom printer.
}
var sortTests = []sortTest{
{
map[int]string{7: "bar", -3: "foo"},
"-3:foo 7:bar",
},
{
map[uint8]string{7: "bar", 3: "foo"},
"3:foo 7:bar",
},
{
map[string]string{"7": "bar", "3": "foo"},
"3:foo 7:bar",
},
{
map[float64]string{7: "bar", -3: "foo", math.NaN(): "nan", math.Inf(0): "inf"},
"NaN:nan -3:foo 7:bar +Inf:inf",
},
{
map[complex128]string{7 + 2i: "bar2", 7 + 1i: "bar", -3: "foo", complex(math.NaN(), 0i): "nan", complex(math.Inf(0), 0i): "inf"},
"(NaN+0i):nan (-3+0i):foo (7+1i):bar (7+2i):bar2 (+Inf+0i):inf",
},
{
map[bool]string{true: "true", false: "false"},
"false:false true:true",
},
{
chanMap(),
"CHAN0:0 CHAN1:1 CHAN2:2",
},
{
pointerMap(),
"PTR0:0 PTR1:1 PTR2:2",
},
{
map[toy]string{toy{7, 2}: "72", toy{7, 1}: "71", toy{3, 4}: "34"},
"{3 4}:34 {7 1}:71 {7 2}:72",
},
{
map[[2]int]string{{7, 2}: "72", {7, 1}: "71", {3, 4}: "34"},
"[3 4]:34 [7 1]:71 [7 2]:72",
},
}
func sprint(data interface{}) string {
om := fmtsort.Sort(reflect.ValueOf(data))
if om == nil {
return "nil"
}
b := new(strings.Builder)
for i, key := range om.Key {
if i > 0 {
b.WriteRune(' ')
}
b.WriteString(sprintKey(key))
b.WriteRune(':')
b.WriteString(fmt.Sprint(om.Value[i]))
}
return b.String()
}
// sprintKey formats a reflect.Value but gives reproducible values for some
// problematic types such as pointers. Note that it only does special handling
// for the troublesome types used in the test cases; it is not a general
// printer.
func sprintKey(key reflect.Value) string {
switch str := key.Type().String(); str {
case "*int":
ptr := key.Interface().(*int)
for i := range ints {
if ptr == &ints[i] {
return fmt.Sprintf("PTR%d", i)
}
}
return "PTR???"
case "chan int":
c := key.Interface().(chan int)
for i := range chans {
if c == chans[i] {
return fmt.Sprintf("CHAN%d", i)
}
}
return "CHAN???"
default:
return fmt.Sprint(key)
}
}
var (
ints [3]int
chans = [3]chan int{make(chan int), make(chan int), make(chan int)}
)
func pointerMap() map[*int]string {
m := make(map[*int]string)
for i := 2; i >= 0; i-- {
m[&ints[i]] = fmt.Sprint(i)
}
return m
}
func chanMap() map[chan int]string {
m := make(map[chan int]string)
for i := 2; i >= 0; i-- {
m[chans[i]] = fmt.Sprint(i)
}
return m
}
type toy struct {
A int // Exported.
b int // Unexported.
}
func TestOrder(t *testing.T) {
for _, test := range sortTests {
got := sprint(test.data)
if got != test.print {
t.Errorf("%s: got %q, want %q", reflect.TypeOf(test.data), got, test.print)
}
}
}
func TestInterface(t *testing.T) {
// A map containing multiple concrete types should be sorted by type,
// then value. However, the relative ordering of types is unspecified,
// so test this by checking the presence of sorted subgroups.
m := map[interface{}]string{
[2]int{1, 0}: "",
[2]int{0, 1}: "",
true: "",
false: "",
3.1: "",
2.1: "",
1.1: "",
math.NaN(): "",
3: "",
2: "",
1: "",
"c": "",
"b": "",
"a": "",
struct{ x, y int }{1, 0}: "",
struct{ x, y int }{0, 1}: "",
}
got := sprint(m)
typeGroups := []string{
"NaN: 1.1: 2.1: 3.1:", // float64
"false: true:", // bool
"1: 2: 3:", // int
"a: b: c:", // string
"[0 1]: [1 0]:", // [2]int
"{0 1}: {1 0}:", // struct{ x int; y int }
}
for _, g := range typeGroups {
if !strings.Contains(got, g) {
t.Errorf("sorted map should contain %q", g)
}
}
}
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