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Benchmark zeroOrOneCharacterStringMatcher.Matches

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This adds some more test cases for unicode values, and also a benchmark
for zeroOrOneCharacterStringMatcher.Matches()

Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
This commit is contained in:
Oleg Zaytsev 2024-05-13 15:36:55 +02:00
parent 3b8b57700c
commit fdfc6d4725
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GPG key ID: 7E9FE9FD48F512EF
1 changed files with 68 additions and 12 deletions
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80
model/labels/regexp_test.go
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@ -19,6 +19,7 @@ import (
"strings"
"testing"
"time"
"unicode/utf8"
"github.com/grafana/regexp"
"github.com/grafana/regexp/syntax"
@ -926,19 +927,74 @@ func BenchmarkOptimizeEqualStringMatchers(b *testing.B) {
}
func TestZeroOrOneCharacterStringMatcher(t *testing.T) {
matcher := &zeroOrOneCharacterStringMatcher{matchNL: true}
require.True(t, matcher.Matches(""))
require.True(t, matcher.Matches("x"))
require.True(t, matcher.Matches("\n"))
require.False(t, matcher.Matches("xx"))
require.False(t, matcher.Matches("\n\n"))
t.Run("match newline", func(t *testing.T) {
matcher := &zeroOrOneCharacterStringMatcher{matchNL: true}
require.True(t, matcher.Matches(""))
require.True(t, matcher.Matches("x"))
require.True(t, matcher.Matches("\n"))
require.False(t, matcher.Matches("xx"))
require.False(t, matcher.Matches("\n\n"))
})
matcher = &zeroOrOneCharacterStringMatcher{matchNL: false}
require.True(t, matcher.Matches(""))
require.True(t, matcher.Matches("x"))
require.False(t, matcher.Matches("\n"))
require.False(t, matcher.Matches("xx"))
require.False(t, matcher.Matches("\n\n"))
t.Run("do not match newline", func(t *testing.T) {
matcher := &zeroOrOneCharacterStringMatcher{matchNL: false}
require.True(t, matcher.Matches(""))
require.True(t, matcher.Matches("x"))
require.False(t, matcher.Matches("\n"))
require.False(t, matcher.Matches("xx"))
require.False(t, matcher.Matches("\n\n"))
})
t.Run("unicode", func(t *testing.T) {
// Just for documentation purposes, emoji1 is 1 rune, emoji2 is 2 runes.
// Having this in mind, will make future readers fixing tests easier.
emoji1 := "😀"
emoji2 := "❤️"
require.Equal(t, 1, utf8.RuneCountInString(emoji1))
require.Equal(t, 2, utf8.RuneCountInString(emoji2))
matcher := &zeroOrOneCharacterStringMatcher{matchNL: true}
require.True(t, matcher.Matches(emoji1))
require.False(t, matcher.Matches(emoji2))
require.False(t, matcher.Matches(emoji1+emoji1))
require.False(t, matcher.Matches("x"+emoji1))
require.False(t, matcher.Matches(emoji1+"x"))
require.False(t, matcher.Matches(emoji1+emoji2))
})
}
func BenchmarkZeroOrOneCharacterStringMatcher(b *testing.B) {
type benchCase struct {
str string
matches bool
}
emoji1 := "😀"
emoji2 := "❤️"
cases := []benchCase{
{"", true},
{"x", true},
{"\n", true},
{"xx", false},
{"\n\n", false},
{emoji1, true},
{emoji2, false},
{emoji1 + emoji1, false},
{strings.Repeat("x", 100), false},
{strings.Repeat(emoji1, 100), false},
{strings.Repeat(emoji2, 100), false},
}
matcher := &zeroOrOneCharacterStringMatcher{matchNL: true}
b.ResetTimer()
for n := 0; n < b.N; n++ {
c := cases[n%len(cases)]
got := matcher.Matches(c.str)
if got != c.matches {
b.Fatalf("unexpected result for %q: got %t, want %t", c.str, got, c.matches)
}
}
}
func TestLiteralPrefixStringMatcher(t *testing.T) {