From 32433430c0cef85e176bc78241e14e0a0bcadb01 Mon Sep 17 00:00:00 2001
From: Ben Ye <benye@amazon.com>
Date: Fri, 19 Apr 2024 02:04:36 +0000
Subject: [PATCH] cleanup unused functions

Signed-off-by: Ben Ye <benye@amazon.com>
---
 pkg/chunk/opts.go      | 60 ------------------------------------------
 pkg/chunk/opts_test.go | 50 -----------------------------------
 2 files changed, 110 deletions(-)
 delete mode 100644 pkg/chunk/opts.go
 delete mode 100644 pkg/chunk/opts_test.go

diff --git a/pkg/chunk/opts.go b/pkg/chunk/opts.go
deleted file mode 100644
index 3384ecd7a43..00000000000
--- a/pkg/chunk/opts.go
+++ /dev/null
@@ -1,60 +0,0 @@
-package chunk
-
-import (
-	"strings"
-	"unicode/utf8"
-)
-
-// Bitmap used by func isRegexMetaCharacter to check whether a character needs to be escaped.
-var regexMetaCharacterBytes [16]byte
-
-// isRegexMetaCharacter reports whether byte b needs to be escaped.
-func isRegexMetaCharacter(b byte) bool {
-	return b < utf8.RuneSelf && regexMetaCharacterBytes[b%16]&(1<<(b/16)) != 0
-}
-
-func init() {
-	for _, b := range []byte(`.+*?()|[]{}^$`) {
-		regexMetaCharacterBytes[b%16] |= 1 << (b / 16)
-	}
-}
-
-// FindSetMatches returns list of values that can be equality matched on.
-// copied from Prometheus querier.go, removed check for Prometheus wrapper.
-func FindSetMatches(pattern string) []string {
-	escaped := false
-	sets := []*strings.Builder{{}}
-	for i := 0; i < len(pattern); i++ {
-		if escaped {
-			switch {
-			case isRegexMetaCharacter(pattern[i]):
-				sets[len(sets)-1].WriteByte(pattern[i])
-			case pattern[i] == '\\':
-				sets[len(sets)-1].WriteByte('\\')
-			default:
-				return nil
-			}
-			escaped = false
-		} else {
-			switch {
-			case isRegexMetaCharacter(pattern[i]):
-				if pattern[i] == '|' {
-					sets = append(sets, &strings.Builder{})
-				} else {
-					return nil
-				}
-			case pattern[i] == '\\':
-				escaped = true
-			default:
-				sets[len(sets)-1].WriteByte(pattern[i])
-			}
-		}
-	}
-	matches := make([]string, 0, len(sets))
-	for _, s := range sets {
-		if s.Len() > 0 {
-			matches = append(matches, s.String())
-		}
-	}
-	return matches
-}
diff --git a/pkg/chunk/opts_test.go b/pkg/chunk/opts_test.go
deleted file mode 100644
index 01d05407e6d..00000000000
--- a/pkg/chunk/opts_test.go
+++ /dev/null
@@ -1,50 +0,0 @@
-package chunk
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/require"
-)
-
-// Refer to https://github.com/prometheus/prometheus/issues/2651.
-func TestFindSetMatches(t *testing.T) {
-	cases := []struct {
-		pattern string
-		exp     []string
-	}{
-		// Simple sets.
-		{
-			pattern: "foo|bar|baz",
-			exp: []string{
-				"foo",
-				"bar",
-				"baz",
-			},
-		},
-		// Simple sets containing escaped characters.
-		{
-			pattern: "fo\\.o|bar\\?|\\^baz",
-			exp: []string{
-				"fo.o",
-				"bar?",
-				"^baz",
-			},
-		},
-		// Simple sets containing special characters without escaping.
-		{
-			pattern: "fo.o|bar?|^baz",
-			exp:     nil,
-		},
-		{
-			pattern: "foo\\|bar\\|baz",
-			exp: []string{
-				"foo|bar|baz",
-			},
-		},
-	}
-
-	for _, c := range cases {
-		matches := FindSetMatches(c.pattern)
-		require.Equal(t, c.exp, matches)
-	}
-}