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Refactor backend SVG package and add tests (#26335)

Introduce a well-tested `svg.Normalize` function.
Make `RenderHTML` faster and more stable.
This commit is contained in:
wxiaoguang 2023-08-05 12:34:59 +08:00 committed by GitHub
parent 12c249c5ca
commit 5db4c8db93
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 113 additions and 40 deletions

View file

@ -6,28 +6,20 @@ package html
// ParseSizeAndClass get size and class from string with default values
// If present, "others" expects the new size first and then the classes to use
func ParseSizeAndClass(defaultSize int, defaultClass string, others ...any) (int, string) {
if len(others) == 0 {
return defaultSize, defaultClass
}
size := defaultSize
_size, ok := others[0].(int)
if ok && _size != 0 {
size = _size
}
if len(others) == 1 {
return size, defaultClass
}
class := defaultClass
if _class, ok := others[1].(string); ok && _class != "" {
if defaultClass == "" {
class = _class
} else {
class = defaultClass + " " + _class
if len(others) >= 1 {
if v, ok := others[0].(int); ok && v != 0 {
size = v
}
}
class := defaultClass
if len(others) >= 2 {
if v, ok := others[1].(string); ok && v != "" {
if class != "" {
class += " "
}
class += v
}
}
return size, class
}

59
modules/svg/processor.go Normal file
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@ -0,0 +1,59 @@
// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package svg
import (
"bytes"
"fmt"
"regexp"
"sync"
)
type normalizeVarsStruct struct {
reXMLDoc,
reComment,
reAttrXMLNs,
reAttrSize,
reAttrClassPrefix *regexp.Regexp
}
var (
normalizeVars *normalizeVarsStruct
normalizeVarsOnce sync.Once
)
// Normalize normalizes the SVG content: set default width/height, remove unnecessary tags/attributes
// It's designed to work with valid SVG content. For invalid SVG content, the returned content is not guaranteed.
func Normalize(data []byte, size int) []byte {
normalizeVarsOnce.Do(func() {
normalizeVars = &normalizeVarsStruct{
reXMLDoc: regexp.MustCompile(`(?s)<\?xml.*?>`),
reComment: regexp.MustCompile(`(?s)<!--.*?-->`),
reAttrXMLNs: regexp.MustCompile(`(?s)\s+xmlns\s*=\s*"[^"]*"`),
reAttrSize: regexp.MustCompile(`(?s)\s+(width|height)\s*=\s*"[^"]+"`),
reAttrClassPrefix: regexp.MustCompile(`(?s)\s+class\s*=\s*"`),
}
})
data = normalizeVars.reXMLDoc.ReplaceAll(data, nil)
data = normalizeVars.reComment.ReplaceAll(data, nil)
data = bytes.TrimSpace(data)
svgTag, svgRemaining, ok := bytes.Cut(data, []byte(">"))
if !ok || !bytes.HasPrefix(svgTag, []byte(`<svg`)) {
return data
}
normalized := bytes.Clone(svgTag)
normalized = normalizeVars.reAttrXMLNs.ReplaceAll(normalized, nil)
normalized = normalizeVars.reAttrSize.ReplaceAll(normalized, nil)
normalized = normalizeVars.reAttrClassPrefix.ReplaceAll(normalized, []byte(` class="`))
normalized = bytes.TrimSpace(normalized)
normalized = fmt.Appendf(normalized, ` width="%d" height="%d"`, size, size)
if !bytes.Contains(normalized, []byte(` class="`)) {
normalized = append(normalized, ` class="svg"`...)
}
normalized = append(normalized, '>')
normalized = append(normalized, svgRemaining...)
return normalized
}

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@ -0,0 +1,29 @@
// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package svg
import (
"testing"
"github.com/stretchr/testify/assert"
)
func TestNormalize(t *testing.T) {
res := Normalize([]byte("foo"), 1)
assert.Equal(t, "foo", string(res))
res = Normalize([]byte(`<?xml version="1.0"?>
<!--
comment
-->
<svg xmlns = "...">content</svg>`), 1)
assert.Equal(t, `<svg width="1" height="1" class="svg">content</svg>`, string(res))
res = Normalize([]byte(`<svg
width="100"
class="svg-icon"
>content</svg>`), 16)
assert.Equal(t, `<svg class="svg-icon" width="16" height="16">content</svg>`, string(res))
}

View file

@ -7,42 +7,35 @@ import (
"fmt"
"html/template"
"path"
"regexp"
"strings"
"code.gitea.io/gitea/modules/html"
gitea_html "code.gitea.io/gitea/modules/html"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/public"
)
var (
// SVGs contains discovered SVGs
SVGs = map[string]string{}
widthRe = regexp.MustCompile(`width="[0-9]+?"`)
heightRe = regexp.MustCompile(`height="[0-9]+?"`)
)
var svgIcons map[string]string
const defaultSize = 16
// Init discovers SVGs and populates the `SVGs` variable
// Init discovers SVG icons and populates the `svgIcons` variable
func Init() error {
files, err := public.AssetFS().ListFiles("assets/img/svg")
const svgAssetsPath = "assets/img/svg"
files, err := public.AssetFS().ListFiles(svgAssetsPath)
if err != nil {
return err
}
// Remove `xmlns` because inline SVG does not need it
reXmlns := regexp.MustCompile(`(<svg\b[^>]*?)\s+xmlns="[^"]*"`)
svgIcons = make(map[string]string, len(files))
for _, file := range files {
if path.Ext(file) != ".svg" {
continue
}
bs, err := public.AssetFS().ReadFile("assets/img/svg", file)
bs, err := public.AssetFS().ReadFile(svgAssetsPath, file)
if err != nil {
log.Error("Failed to read SVG file %s: %v", file, err)
} else {
SVGs[file[:len(file)-4]] = reXmlns.ReplaceAllString(string(bs), "$1")
svgIcons[file[:len(file)-4]] = string(Normalize(bs, defaultSize))
}
}
return nil
@ -50,12 +43,12 @@ func Init() error {
// RenderHTML renders icons - arguments icon name (string), size (int), class (string)
func RenderHTML(icon string, others ...any) template.HTML {
size, class := html.ParseSizeAndClass(defaultSize, "", others...)
if svgStr, ok := SVGs[icon]; ok {
size, class := gitea_html.ParseSizeAndClass(defaultSize, "", others...)
if svgStr, ok := svgIcons[icon]; ok {
// the code is somewhat hacky, but it just works, because the SVG contents are all normalized
if size != defaultSize {
svgStr = widthRe.ReplaceAllString(svgStr, fmt.Sprintf(`width="%d"`, size))
svgStr = heightRe.ReplaceAllString(svgStr, fmt.Sprintf(`height="%d"`, size))
svgStr = strings.Replace(svgStr, fmt.Sprintf(`width="%d"`, defaultSize), fmt.Sprintf(`width="%d"`, size), 1)
svgStr = strings.Replace(svgStr, fmt.Sprintf(`height="%d"`, defaultSize), fmt.Sprintf(`height="%d"`, size), 1)
}
if class != "" {
svgStr = strings.Replace(svgStr, `class="`, fmt.Sprintf(`class="%s `, class), 1)