mirror of
https://github.com/go-gitea/gitea
synced 2024-11-09 03:21:45 +01:00
23645fe05f
* Sort repository tree entries in natural way * Fix sort for different length strings with first parts equal * Improve test case * Refactor return statements * Update gitea/git dependency
89 lines
1.9 KiB
Go
89 lines
1.9 KiB
Go
// Copyright 2017 The Gitea Authors. All rights reserved.
|
|
// Use of this source code is governed by a MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package base
|
|
|
|
import (
|
|
"math/big"
|
|
"unicode/utf8"
|
|
)
|
|
|
|
// NaturalSortLess compares two strings so that they could be sorted in natural order
|
|
func NaturalSortLess(s1, s2 string) bool {
|
|
var i1, i2 int
|
|
for {
|
|
rune1, j1, end1 := getNextRune(s1, i1)
|
|
rune2, j2, end2 := getNextRune(s2, i2)
|
|
if end1 || end2 {
|
|
return end1 != end2 && end1
|
|
}
|
|
dec1 := isDecimal(rune1)
|
|
dec2 := isDecimal(rune2)
|
|
var less, equal bool
|
|
if dec1 && dec2 {
|
|
i1, i2, less, equal = compareByNumbers(s1, i1, s2, i2)
|
|
} else if !dec1 && !dec2 {
|
|
equal = rune1 == rune2
|
|
less = rune1 < rune2
|
|
i1 = j1
|
|
i2 = j2
|
|
} else {
|
|
return rune1 < rune2
|
|
}
|
|
if !equal {
|
|
return less
|
|
}
|
|
}
|
|
}
|
|
|
|
func getNextRune(str string, pos int) (rune, int, bool) {
|
|
if pos < len(str) {
|
|
r, w := utf8.DecodeRuneInString(str[pos:])
|
|
// Fallback to ascii
|
|
if r == utf8.RuneError {
|
|
r = rune(str[pos])
|
|
w = 1
|
|
}
|
|
return r, pos + w, false
|
|
}
|
|
return 0, pos, true
|
|
}
|
|
|
|
func isDecimal(r rune) bool {
|
|
return '0' <= r && r <= '9'
|
|
}
|
|
|
|
func compareByNumbers(str1 string, pos1 int, str2 string, pos2 int) (i1, i2 int, less, equal bool) {
|
|
var d1, d2 bool = true, true
|
|
var dec1, dec2 string
|
|
for d1 || d2 {
|
|
if d1 {
|
|
r, j, end := getNextRune(str1, pos1)
|
|
if !end && isDecimal(r) {
|
|
dec1 += string(r)
|
|
pos1 = j
|
|
} else {
|
|
d1 = false
|
|
}
|
|
}
|
|
if d2 {
|
|
r, j, end := getNextRune(str2, pos2)
|
|
if !end && isDecimal(r) {
|
|
dec2 += string(r)
|
|
pos2 = j
|
|
} else {
|
|
d2 = false
|
|
}
|
|
}
|
|
}
|
|
less, equal = compareBigNumbers(dec1, dec2)
|
|
return pos1, pos2, less, equal
|
|
}
|
|
|
|
func compareBigNumbers(dec1, dec2 string) (less, equal bool) {
|
|
d1, _ := big.NewInt(0).SetString(dec1, 10)
|
|
d2, _ := big.NewInt(0).SetString(dec2, 10)
|
|
cmp := d1.Cmp(d2)
|
|
return cmp < 0, cmp == 0
|
|
}
|