One of the termui tests was failing; this fixes the numbered.Less() function.
Something in sorting was broken at some point, maybe during a Go version upgrade? That code hasn't changed in a while. While fixing the code, I rewrote the `numbered.Less()` function. It's shorter, and I think it's clearer, but in addition to being correct now it's also about 10% faster than the original.
This commit is contained in:
Sean E. Russell
parent
9997208503
commit
25aa78a6ee
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@ -171,57 +171,63 @@ type numbered []string
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func (n numbered) Len() int { return len(n) }
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func (n numbered) Swap(i, j int) { n[i], n[j] = n[j], n[i] }
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func (n numbered) Less(i, j int) bool {
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a := n[i]
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b := n[j]
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for i := 0; i < len(a); i++ {
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ac := a[i]
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if unicode.IsDigit(rune(ac)) {
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j := i + 1
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for ; j < len(a); j++ {
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if !unicode.IsDigit(rune(a[j])) {
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break
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}
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if j >= len(b) {
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ars := n[i]
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brs := n[j]
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// iterate over the runes in string A
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var ai int
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for ai = 0; ai < len(ars); ai++ {
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ar := ars[ai]
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// if brs has been equal to ars so far, but is shorter, than brs is less
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if ai >= len(brs) {
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return false
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}
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if !unicode.IsDigit(rune(b[j])) {
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br := brs[ai]
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// handle numbers if we find them
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if unicode.IsDigit(rune(ar)) {
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// if ar is a digit and br isn't, then ars is less
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if !unicode.IsDigit(rune(brs[ai])) {
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return true
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}
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// now get the range for the full numbers, which is the sequence of consecutive digits from each
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ae := ai + 1
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be := ae
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for ; ae < len(ars) && unicode.IsDigit(rune(ars[ae])); ae++ {
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}
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for ; be < len(brs) && unicode.IsDigit(rune(brs[be])); be++ {
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}
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if be < ae {
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return false
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}
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}
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an, err := strconv.Atoi(a[i:j])
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adigs, err := strconv.Atoi(string(ars[ai:ae]))
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if err != nil {
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return true
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}
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if j > len(b) {
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return false
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}
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for ; j < len(b); j++ {
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if !unicode.IsDigit(rune(b[j])) {
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break
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}
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}
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bn, err := strconv.Atoi(b[i:j])
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bdigs, err := strconv.Atoi(string(brs[ai:be]))
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if err != nil {
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return true
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}
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if an < bn {
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return true
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} else if bn < an {
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// The numbers are equal; continue with the rest of the string
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if adigs == bdigs {
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ai = ae - 1
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continue
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}
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return adigs < bdigs
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} else if unicode.IsDigit(rune(br)) {
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return false
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}
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i = j
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if ar == br {
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continue
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}
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if i >= len(a) {
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// No digits, so compare letters
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if ar < br {
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return true
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} else if i >= len(b) {
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}
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return false
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}
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if ac < b[i] {
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if ai <= len(brs) {
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return true
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} else if b[i] < ac {
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}
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return false
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}
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}
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return true
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}
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@ -1,7 +1,10 @@
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package termui
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import "testing"
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import "sort"
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import (
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"github.com/stretchr/testify/assert"
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"sort"
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"testing"
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)
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func TestLess(t *testing.T) {
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tests := []struct {
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@ -16,6 +19,10 @@ func TestLess(t *testing.T) {
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{a: "a2", b: "2", e: false},
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{a: "a2", b: "a10", e: true},
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{a: "a20", b: "a2", e: false},
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{a: "abc", b: "abc20", e: true},
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{a: "a1", b: "abc", e: true},
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{a: "a20", b: "abc", e: true},
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{a: "abc20", b: "abc", e: false},
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{a: "abc20", b: "def2", e: true},
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{a: "abc20", b: "abc2", e: false},
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{a: "abc20", b: "abc20", e: true},
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@ -29,9 +36,7 @@ func TestLess(t *testing.T) {
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for _, k := range tests {
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n := numbered([]string{k.a, k.b})
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g := n.Less(0, 1)
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if g != k.e {
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t.Errorf("%s < %s: expected %v, got %v", k.a, k.b, k.e, g)
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}
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assert.Equal(t, k.e, g, "%s < %s %t", k.a, k.b, g)
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}
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}
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@ -40,7 +45,7 @@ func TestSort(t *testing.T) {
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in, ex numbered
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}{
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{
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in: numbered{"abc", "def", "abc", "abc", "def", "abc", "1", "10", "1", "2", "a2", "2", "a2", "a10", "a20", "a2", "abc20", "def2", "abc20", "abc2", "abc20", "abc20", "abc30", "abc20", "abc20a", "abc20", "abc20", "abc20a", "abc20", "abc2a"},
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in: numbered{"abc", "def", "abc", "def", "abc", "1", "10", "1", "2", "a2", "2", "a2", "a10", "a20", "a2", "abc20", "def2", "abc20", "abc2", "abc20", "abc20", "abc30", "abc20", "abc20a", "abc20", "abc20", "abc20a", "abc20", "abc2a", "abc"},
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ex: numbered{"1", "1", "2", "2", "10", "a2", "a2", "a2", "a10", "a20", "abc", "abc", "abc", "abc", "abc2", "abc2a", "abc20", "abc20", "abc20", "abc20", "abc20", "abc20", "abc20", "abc20", "abc20a", "abc20a", "abc30", "def", "def", "def2"},
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},
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{
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@ -51,10 +56,37 @@ func TestSort(t *testing.T) {
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for _, k := range tests {
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sort.Sort(k.in)
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for i, v := range k.in {
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if v != k.ex[i] {
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t.Errorf("failed to properly sort\n\texpected: %v\n\tgot: %v", k.ex, k.in)
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assert.Equal(t, k.ex, k.in)
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}
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}
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func BenchmarkLess(b *testing.B) {
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tests := []numbered{
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numbered([]string{"abc", "def"}),
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numbered([]string{"abc", "abc"}),
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numbered([]string{"def", "abc"}),
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numbered([]string{"1", "10"}),
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numbered([]string{"1", "2"}),
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numbered([]string{"a2", "2"}),
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numbered([]string{"a2", "a10"}),
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numbered([]string{"a20", "a2"}),
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numbered([]string{"abc", "abc20"}),
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numbered([]string{"a1", "abc"}),
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numbered([]string{"a20", "abc"}),
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numbered([]string{"abc20", "abc"}),
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numbered([]string{"abc20", "def2"}),
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numbered([]string{"abc20", "abc2"}),
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numbered([]string{"abc20", "abc20"}),
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numbered([]string{"abc30", "abc20"}),
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numbered([]string{"abc20a", "abc20"}),
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numbered([]string{"abc20", "abc20a"}),
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numbered([]string{"abc20", "abc2a"}),
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numbered([]string{"abc20", "abc3a"}),
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numbered([]string{"abc20", "abc2abc"}),
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}
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for i := 0; i < b.N; i++ {
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for _, t := range tests {
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t.Less(0, 1)
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}
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}
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}
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