From 81ffb8b9704ea4f04dfc06ccb3300d236e8aeef2 Mon Sep 17 00:00:00 2001
From: Hana Kim <hyangah@gmail.com>
Date: Thu, 5 Mar 2026 22:48:28 -0500
Subject: all: run go fix -stringsbuilder

Change-Id: I839e47c2b39ee592909f7ecb03603d4fb1d1954b
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/753430
Reviewed-by: Jonathan Amsterdam <jba@google.com>
kokoro-CI: kokoro <noreply+kokoro@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
---
 devtools/cmd/css/main.go                    | 12 ++++++------
 internal/middleware/accept_requests_test.go |  9 +++++----
 internal/symbol/goapi.go                    |  7 ++++---
 internal/testing/htmlcheck/query.go         | 11 ++++++-----
 4 files changed, 21 insertions(+), 18 deletions(-)

diff --git a/devtools/cmd/css/main.go b/devtools/cmd/css/main.go
index 187ebe42..bcea960a 100644
--- a/devtools/cmd/css/main.go
+++ b/devtools/cmd/css/main.go
@@ -179,7 +179,7 @@ func pxToRem(value string) string {
 // replaceValueWithRems replaces the px values in a line of css with rems.
 // e.g: padding: 25px 10px => padding:
 func replaceValueWithRems(line string) string {
-	var cssLine string
+	var cssLine strings.Builder
 	valueRegex := regexp.MustCompile(`([-+]?[0-9]*\.?[0-9]+)px`)
 	matches := valueRegex.FindAllStringSubmatchIndex(line, -1)
 	for idx, m := range matches {
@@ -188,15 +188,15 @@ func replaceValueWithRems(line string) string {
 		// The value here is the full string "25px" and num is just "25".
 		valueStartIdx, valueEndIdx, numStartIdx, numEndIdx := m[0], m[1], m[2], m[3]
 		if idx == 0 {
-			cssLine += line[0:valueStartIdx]
+			cssLine.WriteString(line[0:valueStartIdx])
 		}
-		cssLine += pxToRem(line[numStartIdx:numEndIdx])
+		cssLine.WriteString(pxToRem(line[numStartIdx:numEndIdx]))
 		if idx == len(matches)-1 {
-			cssLine += line[valueEndIdx:]
+			cssLine.WriteString(line[valueEndIdx:])
 		} else {
 			// If there are more matches for "px", add up until the start of the next match.
-			cssLine += line[valueEndIdx:matches[idx+1][0]]
+			cssLine.WriteString(line[valueEndIdx:matches[idx+1][0]])
 		}
 	}
-	return cssLine
+	return cssLine.String()
 }
diff --git a/internal/middleware/accept_requests_test.go b/internal/middleware/accept_requests_test.go
index 24f5fa19..e1971bac 100644
--- a/internal/middleware/accept_requests_test.go
+++ b/internal/middleware/accept_requests_test.go
@@ -7,6 +7,7 @@ package middleware
 import (
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"
 )
 
@@ -62,20 +63,20 @@ func TestAcceptRequests_URILength(t *testing.T) {
 	defer ts.Close()
 	c := ts.Client()
 
-	var longURL string
+	var longURL strings.Builder
 	// Create a URL with 990 characters.
 	numParts := maxURILength/2 - 5
 	for range numParts {
-		longURL += "/a"
+		longURL.WriteString("/a")
 	}
 	// Without this query param, the length of longURL will be < maxURILength.
-	longURL += "?q=randomstring"
+	longURL.WriteString("?q=randomstring")
 	for _, test := range []struct {
 		name, urlPath string
 		want          bool
 	}{
 		{"short URL", "/shorturlpath", true},
-		{"long URL", longURL, false},
+		{"long URL", longURL.String(), false},
 	} {
 		called = false
 		req, err := http.NewRequest(http.MethodGet, ts.URL+test.urlPath, nil)
diff --git a/internal/symbol/goapi.go b/internal/symbol/goapi.go
index fd4cc840..5dbea638 100644
--- a/internal/symbol/goapi.go
+++ b/internal/symbol/goapi.go
@@ -83,7 +83,8 @@ func tagKey(dir string, context *build.Context, tags []string) string {
 		ctags[tag] = true
 	}
 	// TODO: ReleaseTags (need to load default)
-	key := dir
+	var key strings.Builder
+	key.WriteString(dir)
 	// explicit on GOOS and GOARCH as global cache will use "all" cached packages for
 	// an indirect imported package. See https://github.com/golang/go/issues/21181
 	// for more detail.
@@ -91,11 +92,11 @@ func tagKey(dir string, context *build.Context, tags []string) string {
 	sort.Strings(tags)
 	for _, tag := range tags {
 		if ctags[tag] {
-			key += "," + tag
+			key.WriteString("," + tag)
 			ctags[tag] = false
 		}
 	}
-	return key
+	return key.String()
 }
 
 var listCache sync.Map // map[string]listImports, keyed by contextName
diff --git a/internal/testing/htmlcheck/query.go b/internal/testing/htmlcheck/query.go
index fe594150..ea082270 100644
--- a/internal/testing/htmlcheck/query.go
+++ b/internal/testing/htmlcheck/query.go
@@ -29,15 +29,16 @@ func (s *selector) String() string {
 	if s == nil {
 		return "nil"
 	}
-	str := "["
+	var str strings.Builder
+	str.WriteString("[")
 	for i, atom := range s.atoms {
-		str += fmt.Sprintf("%#v", atom)
+		str.WriteString(fmt.Sprintf("%#v", atom))
 		if i != len(s.atoms)-1 {
-			str += ","
+			str.WriteString(",")
 		}
 	}
-	str += "]->" + s.next.String()
-	return str
+	str.WriteString("]->" + s.next.String())
+	return str.String()
 }
 
 // selectorAtom represents a part of a selector that individually
-- 
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