| // 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{{7, 2}: "72", {7, 1}: "71", {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) |
| } |
| } |
| } |