mirror of https://github.com/perkeep/perkeep.git
52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
/*
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Copyright 2011 The Perkeep Authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 index
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import (
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"fmt"
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"strings"
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)
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func unreverseTimeString(s string) string {
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if !strings.HasPrefix(s, "rt") {
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panic(fmt.Sprintf("can't unreverse time string: %q", s))
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}
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b := make([]byte, 0, len(s)-2)
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b = appendReverseString(b, s[2:])
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return string(b)
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}
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func reverseTimeString(s string) string {
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b := make([]byte, 0, len(s)+2)
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b = append(b, 'r')
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b = append(b, 't')
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b = appendReverseString(b, s)
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return string(b)
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}
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func appendReverseString(b []byte, s string) []byte {
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for i := 0; i < len(s); i++ {
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c := s[i]
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if c >= '0' && c <= '9' {
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b = append(b, '0'+('9'-c))
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} else {
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b = append(b, c)
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}
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}
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return b
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}
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