Scott Baker | bdb962b | 2020-04-03 10:53:36 -0700 | [diff] [blame^] | 1 | package yaml |
| 2 | |
| 3 | import ( |
| 4 | "reflect" |
| 5 | "unicode" |
| 6 | ) |
| 7 | |
| 8 | type keyList []reflect.Value |
| 9 | |
| 10 | func (l keyList) Len() int { return len(l) } |
| 11 | func (l keyList) Swap(i, j int) { l[i], l[j] = l[j], l[i] } |
| 12 | func (l keyList) Less(i, j int) bool { |
| 13 | a := l[i] |
| 14 | b := l[j] |
| 15 | ak := a.Kind() |
| 16 | bk := b.Kind() |
| 17 | for (ak == reflect.Interface || ak == reflect.Ptr) && !a.IsNil() { |
| 18 | a = a.Elem() |
| 19 | ak = a.Kind() |
| 20 | } |
| 21 | for (bk == reflect.Interface || bk == reflect.Ptr) && !b.IsNil() { |
| 22 | b = b.Elem() |
| 23 | bk = b.Kind() |
| 24 | } |
| 25 | af, aok := keyFloat(a) |
| 26 | bf, bok := keyFloat(b) |
| 27 | if aok && bok { |
| 28 | if af != bf { |
| 29 | return af < bf |
| 30 | } |
| 31 | if ak != bk { |
| 32 | return ak < bk |
| 33 | } |
| 34 | return numLess(a, b) |
| 35 | } |
| 36 | if ak != reflect.String || bk != reflect.String { |
| 37 | return ak < bk |
| 38 | } |
| 39 | ar, br := []rune(a.String()), []rune(b.String()) |
| 40 | for i := 0; i < len(ar) && i < len(br); i++ { |
| 41 | if ar[i] == br[i] { |
| 42 | continue |
| 43 | } |
| 44 | al := unicode.IsLetter(ar[i]) |
| 45 | bl := unicode.IsLetter(br[i]) |
| 46 | if al && bl { |
| 47 | return ar[i] < br[i] |
| 48 | } |
| 49 | if al || bl { |
| 50 | return bl |
| 51 | } |
| 52 | var ai, bi int |
| 53 | var an, bn int64 |
| 54 | if ar[i] == '0' || br[i] == '0' { |
| 55 | for j := i-1; j >= 0 && unicode.IsDigit(ar[j]); j-- { |
| 56 | if ar[j] != '0' { |
| 57 | an = 1 |
| 58 | bn = 1 |
| 59 | break |
| 60 | } |
| 61 | } |
| 62 | } |
| 63 | for ai = i; ai < len(ar) && unicode.IsDigit(ar[ai]); ai++ { |
| 64 | an = an*10 + int64(ar[ai]-'0') |
| 65 | } |
| 66 | for bi = i; bi < len(br) && unicode.IsDigit(br[bi]); bi++ { |
| 67 | bn = bn*10 + int64(br[bi]-'0') |
| 68 | } |
| 69 | if an != bn { |
| 70 | return an < bn |
| 71 | } |
| 72 | if ai != bi { |
| 73 | return ai < bi |
| 74 | } |
| 75 | return ar[i] < br[i] |
| 76 | } |
| 77 | return len(ar) < len(br) |
| 78 | } |
| 79 | |
| 80 | // keyFloat returns a float value for v if it is a number/bool |
| 81 | // and whether it is a number/bool or not. |
| 82 | func keyFloat(v reflect.Value) (f float64, ok bool) { |
| 83 | switch v.Kind() { |
| 84 | case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
| 85 | return float64(v.Int()), true |
| 86 | case reflect.Float32, reflect.Float64: |
| 87 | return v.Float(), true |
| 88 | case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: |
| 89 | return float64(v.Uint()), true |
| 90 | case reflect.Bool: |
| 91 | if v.Bool() { |
| 92 | return 1, true |
| 93 | } |
| 94 | return 0, true |
| 95 | } |
| 96 | return 0, false |
| 97 | } |
| 98 | |
| 99 | // numLess returns whether a < b. |
| 100 | // a and b must necessarily have the same kind. |
| 101 | func numLess(a, b reflect.Value) bool { |
| 102 | switch a.Kind() { |
| 103 | case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
| 104 | return a.Int() < b.Int() |
| 105 | case reflect.Float32, reflect.Float64: |
| 106 | return a.Float() < b.Float() |
| 107 | case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: |
| 108 | return a.Uint() < b.Uint() |
| 109 | case reflect.Bool: |
| 110 | return !a.Bool() && b.Bool() |
| 111 | } |
| 112 | panic("not a number") |
| 113 | } |