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// |
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// Copyright (c) 2011-2019 Canonical Ltd |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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|
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package yaml |
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|
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import ( |
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"reflect" |
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"unicode" |
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) |
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|
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type keyList []reflect.Value |
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|
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func (l keyList) Len() int { return len(l) } |
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func (l keyList) Swap(i, j int) { l[i], l[j] = l[j], l[i] } |
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func (l keyList) Less(i, j int) bool { |
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a := l[i] |
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b := l[j] |
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ak := a.Kind() |
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bk := b.Kind() |
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for (ak == reflect.Interface || ak == reflect.Ptr) && !a.IsNil() { |
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a = a.Elem() |
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ak = a.Kind() |
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} |
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for (bk == reflect.Interface || bk == reflect.Ptr) && !b.IsNil() { |
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b = b.Elem() |
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bk = b.Kind() |
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} |
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af, aok := keyFloat(a) |
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bf, bok := keyFloat(b) |
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if aok && bok { |
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if af != bf { |
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return af < bf |
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} |
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if ak != bk { |
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return ak < bk |
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} |
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return numLess(a, b) |
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} |
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if ak != reflect.String || bk != reflect.String { |
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return ak < bk |
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} |
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ar, br := []rune(a.String()), []rune(b.String()) |
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digits := false |
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for i := 0; i < len(ar) && i < len(br); i++ { |
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if ar[i] == br[i] { |
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digits = unicode.IsDigit(ar[i]) |
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continue |
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} |
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al := unicode.IsLetter(ar[i]) |
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bl := unicode.IsLetter(br[i]) |
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if al && bl { |
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return ar[i] < br[i] |
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} |
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if al || bl { |
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if digits { |
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return al |
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} else { |
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return bl |
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} |
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} |
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var ai, bi int |
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var an, bn int64 |
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if ar[i] == '0' || br[i] == '0' { |
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for j := i - 1; j >= 0 && unicode.IsDigit(ar[j]); j-- { |
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if ar[j] != '0' { |
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an = 1 |
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bn = 1 |
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break |
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} |
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} |
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} |
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for ai = i; ai < len(ar) && unicode.IsDigit(ar[ai]); ai++ { |
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an = an*10 + int64(ar[ai]-'0') |
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} |
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for bi = i; bi < len(br) && unicode.IsDigit(br[bi]); bi++ { |
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bn = bn*10 + int64(br[bi]-'0') |
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} |
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if an != bn { |
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return an < bn |
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} |
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if ai != bi { |
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return ai < bi |
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} |
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return ar[i] < br[i] |
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} |
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return len(ar) < len(br) |
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} |
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|
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// keyFloat returns a float value for v if it is a number/bool |
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// and whether it is a number/bool or not. |
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func keyFloat(v reflect.Value) (f float64, ok bool) { |
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switch v.Kind() { |
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
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return float64(v.Int()), true |
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case reflect.Float32, reflect.Float64: |
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return v.Float(), true |
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: |
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return float64(v.Uint()), true |
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case reflect.Bool: |
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if v.Bool() { |
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return 1, true |
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} |
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return 0, true |
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} |
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return 0, false |
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} |
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|
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// numLess returns whether a < b. |
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// a and b must necessarily have the same kind. |
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func numLess(a, b reflect.Value) bool { |
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switch a.Kind() { |
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
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return a.Int() < b.Int() |
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case reflect.Float32, reflect.Float64: |
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return a.Float() < b.Float() |
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr: |
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return a.Uint() < b.Uint() |
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case reflect.Bool: |
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return !a.Bool() && b.Bool() |
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} |
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panic("not a number") |
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} |
