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zeekayandHanzo Dev
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Source files keep their SPDX-License-Identifier and Hanzo copyright line; the Gitea, Gogs and LFS Test Server copyrights they used to repeat now live once in NOTICE, alongside LICENSE. The header lint accepts any copyright line above the SPDX line, so it no longer demands an upstream one. Co-authored-by: Hanzo Dev <[email protected]>
57 lines
1.7 KiB
Go
57 lines
1.7 KiB
Go
// Copyright 2026 Hanzo AI, Inc. All rights reserved.
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// SPDX-License-Identifier: MIT
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package svg
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import (
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"bytes"
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"fmt"
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"regexp"
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"sync"
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)
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type globalVarsStruct struct {
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reXMLDoc,
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reComment,
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reAttrXMLNs,
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reAttrSize,
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reAttrClassPrefix *regexp.Regexp
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}
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var globalVars = sync.OnceValue(func() *globalVarsStruct {
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return &globalVarsStruct{
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reXMLDoc: regexp.MustCompile(`(?s)<\?xml.*?>`),
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reComment: regexp.MustCompile(`(?s)<!--.*?-->`),
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reAttrXMLNs: regexp.MustCompile(`(?s)\s+xmlns\s*=\s*"[^"]*"`),
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reAttrSize: regexp.MustCompile(`(?s)\s+(width|height)\s*=\s*"[^"]+"`),
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reAttrClassPrefix: regexp.MustCompile(`(?s)\s+class\s*=\s*"`),
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}
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})
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// Normalize normalizes the SVG content: set default width/height, remove unnecessary tags/attributes
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// It's designed to work with valid SVG content. For invalid SVG content, the returned content is not guaranteed.
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func Normalize(data []byte, size int) []byte {
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vars := globalVars()
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data = vars.reXMLDoc.ReplaceAll(data, nil)
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data = vars.reComment.ReplaceAll(data, nil)
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data = bytes.TrimSpace(data)
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svgTag, svgRemaining, ok := bytes.Cut(data, []byte(">"))
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if !ok || !bytes.HasPrefix(svgTag, []byte(`<svg`)) {
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return data
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}
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normalized := bytes.Clone(svgTag)
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normalized = vars.reAttrXMLNs.ReplaceAll(normalized, nil)
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normalized = vars.reAttrSize.ReplaceAll(normalized, nil)
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normalized = vars.reAttrClassPrefix.ReplaceAll(normalized, []byte(` class="`))
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normalized = bytes.TrimSpace(normalized)
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normalized = fmt.Appendf(normalized, ` width="%d" height="%d"`, size, size)
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if !bytes.Contains(normalized, []byte(` class="`)) {
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normalized = append(normalized, ` class="svg"`...)
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}
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normalized = append(normalized, '>')
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normalized = append(normalized, svgRemaining...)
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return normalized
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}
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