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all: replace rickypai/natsort with internal/natsort
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The MIT License (MIT) | ||
Copyright (c) 2015 Frits van Bommel | ||
Permission is hereby granted, free of charge, to any person obtaining a copy | ||
of this software and associated documentation files (the "Software"), to deal | ||
in the Software without restriction, including without limitation the rights | ||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
copies of the Software, and to permit persons to whom the Software is | ||
furnished to do so, subject to the following conditions: | ||
The above copyright notice and this permission notice shall be included in all | ||
copies or substantial portions of the Software. | ||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
SOFTWARE. |
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# natsort | ||
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This is a fork of the `sortorder` package of [github.com/fvbommel/util](https://github.com/fvbommel/util). | ||
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## License | ||
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* [MIT](./LICENSE) | ||
- the original implementation of `sortorder` was released by [Frits van Bommel](https://github.com/fvbommel) under an MIT license. | ||
* [Public domain](../../UNLICENSE) | ||
- any changes made in this fork are released into the public domain. |
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// Package natsort implements natural sort. In "Natural Sort Order" integers | ||
// embedded in strings are compared by value. | ||
// | ||
// References: | ||
// https://blog.codinghorror.com/sorting-for-humans-natural-sort-order/ | ||
package natsort | ||
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import ( | ||
"sort" | ||
) | ||
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// Strings sorts the given slice of strings in natural order. | ||
func Strings(a []string) { | ||
sort.Sort(Order(a)) | ||
} | ||
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// Order implements sort.Interface to sort strings in natural order. This means | ||
// that e.g. "abc2" < "abc12". | ||
// | ||
// Non-digit sequences and numbers are compared separately. The former are | ||
// compared bytewise, while the latter are compared numerically (except that | ||
// the number of leading zeros is used as a tie-breaker, so e.g. "2" < "02") | ||
// | ||
// Limitation: only ASCII digits (0-9) are considered. | ||
type Order []string | ||
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func (n Order) Len() int { return len(n) } | ||
func (n Order) Swap(i, j int) { n[i], n[j] = n[j], n[i] } | ||
func (n Order) Less(i, j int) bool { return Less(n[i], n[j]) } | ||
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// isdigit reports whether the given byte is a decimal digit. | ||
func isdigit(b byte) bool { | ||
return '0' <= b && b <= '9' | ||
} | ||
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// Less compares two strings using natural ordering. This means that e.g. "abc2" | ||
// < "abc12". | ||
// | ||
// Non-digit sequences and numbers are compared separately. The former are | ||
// compared bytewise, while the latter are compared numerically (except that | ||
// the number of leading zeros is used as a tie-breaker, so e.g. "2" < "02") | ||
// | ||
// Limitation: only ASCII digits (0-9) are considered. | ||
func Less(str1, str2 string) bool { | ||
idx1, idx2 := 0, 0 | ||
for idx1 < len(str1) && idx2 < len(str2) { | ||
c1, c2 := str1[idx1], str2[idx2] | ||
dig1, dig2 := isdigit(c1), isdigit(c2) | ||
switch { | ||
case dig1 && dig2: // Digits | ||
// Eat zeros. | ||
for ; idx1 < len(str1) && str1[idx1] == '0'; idx1++ { | ||
} | ||
for ; idx2 < len(str2) && str2[idx2] == '0'; idx2++ { | ||
} | ||
// Eat all digits. | ||
nonZero1, nonZero2 := idx1, idx2 | ||
for ; idx1 < len(str1) && isdigit(str1[idx1]); idx1++ { | ||
} | ||
for ; idx2 < len(str2) && isdigit(str2[idx2]); idx2++ { | ||
} | ||
// If lengths of numbers with non-zero prefix differ, the shorter | ||
// one is less. | ||
if len1, len2 := idx1-nonZero1, idx2-nonZero2; len1 != len2 { | ||
return len1 < len2 | ||
} | ||
// If they're equal, string comparison is correct. | ||
if nr1, nr2 := str1[nonZero1:idx1], str2[nonZero2:idx2]; nr1 != nr2 { | ||
return nr1 < nr2 | ||
} | ||
// Otherwise, the one with less zeros is less. | ||
// Because everything up to the number is equal, comparing the index | ||
// after the zeros is sufficient. | ||
if nonZero1 != nonZero2 { | ||
return nonZero1 < nonZero2 | ||
} | ||
default: // non-digit characters | ||
// UTF-8 compares bytewise-lexicographically, no need to decode | ||
// codepoints. | ||
if c1 != c2 { | ||
return c1 < c2 | ||
} | ||
idx1++ | ||
idx2++ | ||
} | ||
// They're identical so far, so continue comparing. | ||
} | ||
// So far they are identical. At least one is ended. If the other continues, | ||
// it sorts last. | ||
return len(str1) < len(str2) | ||
} |
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package natsort | ||
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import ( | ||
"math/rand" | ||
"reflect" | ||
"sort" | ||
"strconv" | ||
"testing" | ||
) | ||
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func TestStrings(t *testing.T) { | ||
golden := []struct { | ||
in []string | ||
want []string | ||
}{ | ||
{ | ||
in: []string{"abc5", "abc1", "abc01", "ab", "abc10", "abc2"}, | ||
want: []string{ | ||
"ab", | ||
"abc1", | ||
"abc01", | ||
"abc2", | ||
"abc5", | ||
"abc10", | ||
}, | ||
}, | ||
{ | ||
in: []string{"foo20", "foo.bar", "foo2", "foo.10", "foo.1", "foo.20", "foo.11", "foo1", "foobar", "foo21", "foo10", "foo11", "foo.21", "foo.2"}, | ||
want: []string{ | ||
"foo.1", | ||
"foo.2", | ||
"foo.10", | ||
"foo.11", | ||
"foo.20", | ||
"foo.21", | ||
"foo.bar", | ||
"foo1", | ||
"foo2", | ||
"foo10", | ||
"foo11", | ||
"foo20", | ||
"foo21", | ||
"foobar", | ||
}, | ||
}, | ||
} | ||
for _, g := range golden { | ||
Strings(g.in) | ||
if !reflect.DeepEqual(g.want, g.in) { | ||
t.Errorf("Error: sort failed, expected: %#q, got: %#q", g.want, g.in) | ||
} | ||
} | ||
} | ||
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func TestLess(t *testing.T) { | ||
testset := []struct { | ||
s1, s2 string | ||
less bool | ||
}{ | ||
{"0", "00", true}, | ||
{"00", "0", false}, | ||
{"aa", "ab", true}, | ||
{"ab", "abc", true}, | ||
{"abc", "ad", true}, | ||
{"ab1", "ab2", true}, | ||
{"ab1c", "ab1c", false}, | ||
{"ab12", "abc", true}, | ||
{"ab2a", "ab10", true}, | ||
{"a0001", "a0000001", true}, | ||
{"a10", "abcdefgh2", true}, | ||
{"аб2аб", "аб10аб", true}, | ||
{"2аб", "3аб", true}, | ||
// | ||
{"a1b", "a01b", true}, | ||
{"a01b", "a1b", false}, | ||
{"ab01b", "ab010b", true}, | ||
{"ab010b", "ab01b", false}, | ||
{"a01b001", "a001b01", true}, | ||
{"a001b01", "a01b001", false}, | ||
{"a1", "a1x", true}, | ||
{"1ax", "1b", true}, | ||
{"1b", "1ax", false}, | ||
// | ||
{"082", "83", true}, | ||
// | ||
{"083a", "9a", false}, | ||
{"9a", "083a", true}, | ||
// | ||
{"foo.bar", "foo123", true}, | ||
{"foo123", "foo.bar", false}, | ||
} | ||
for _, v := range testset { | ||
if res := Less(v.s1, v.s2); res != v.less { | ||
t.Errorf("Compared %#q to %#q: expected %v, got %v", | ||
v.s1, v.s2, v.less, res) | ||
} | ||
} | ||
} | ||
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func BenchmarkStdStrings(b *testing.B) { | ||
set := testSet(300) | ||
arr := make([]string, len(set[0])) | ||
b.ResetTimer() | ||
for i := 0; i < b.N; i++ { | ||
for _, list := range set { | ||
b.StopTimer() | ||
copy(arr, list) | ||
b.StartTimer() | ||
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sort.Strings(arr) | ||
} | ||
} | ||
} | ||
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func BenchmarkStrings(b *testing.B) { | ||
set := testSet(300) | ||
arr := make([]string, len(set[0])) | ||
b.ResetTimer() | ||
for i := 0; i < b.N; i++ { | ||
for _, list := range set { | ||
b.StopTimer() | ||
copy(arr, list) | ||
b.StartTimer() | ||
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Strings(arr) | ||
} | ||
} | ||
} | ||
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func BenchmarkStdLess(b *testing.B) { | ||
set := testSet(300) | ||
b.ResetTimer() | ||
for i := 0; i < b.N; i++ { | ||
for j := range set[0] { | ||
k := (j + 1) % len(set[0]) | ||
_ = set[0][j] < set[0][k] | ||
} | ||
} | ||
} | ||
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func BenchmarkLess(b *testing.B) { | ||
set := testSet(300) | ||
b.ResetTimer() | ||
for i := 0; i < b.N; i++ { | ||
for j := range set[0] { | ||
k := (j + 1) % len(set[0]) | ||
_ = Less(set[0][j], set[0][k]) | ||
} | ||
} | ||
} | ||
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// Get 1000 arrays of 10000-string-arrays (less if -short is specified). | ||
func testSet(seed int) [][]string { | ||
gen := &generator{ | ||
src: rand.New(rand.NewSource( | ||
int64(seed), | ||
)), | ||
} | ||
n := 1000 | ||
if testing.Short() { | ||
n = 1 | ||
} | ||
set := make([][]string, n) | ||
for i := range set { | ||
strings := make([]string, 10000) | ||
for idx := range strings { | ||
// Generate a random string | ||
strings[idx] = gen.NextString() | ||
} | ||
set[i] = strings | ||
} | ||
return set | ||
} | ||
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type generator struct { | ||
src *rand.Rand | ||
} | ||
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func (g *generator) NextInt(max int) int { | ||
return g.src.Intn(max) | ||
} | ||
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// Gets random random-length alphanumeric string. | ||
func (g *generator) NextString() (str string) { | ||
// Random-length 3-8 chars part | ||
strlen := g.src.Intn(6) + 3 | ||
// Random-length 1-3 num | ||
numlen := g.src.Intn(3) + 1 | ||
// Random position for num in string | ||
numpos := g.src.Intn(strlen + 1) | ||
// Generate the number | ||
var num string | ||
for i := 0; i < numlen; i++ { | ||
num += strconv.Itoa(g.src.Intn(10)) | ||
} | ||
// Put it all together | ||
for i := 0; i < strlen+1; i++ { | ||
if i == numpos { | ||
str += num | ||
} else { | ||
str += string('a' + g.src.Intn(16)) | ||
} | ||
} | ||
return str | ||
} |
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