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// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package markdown
import (
"bytes"
"fmt"
"code.gitea.io/gitea/modules/container"
"code.gitea.io/gitea/modules/markup/common"
"code.gitea.io/gitea/modules/util"
"github.com/yuin/goldmark/ast"
)
type prefixedIDs struct {
values container.Set[string]
}
// Generate generates a new element id.
func (p *prefixedIDs) Generate(value []byte, kind ast.NodeKind) []byte {
dft := []byte("id")
if kind == ast.KindHeading {
dft = []byte("heading")
}
return p.GenerateWithDefault(value, dft)
}
// GenerateWithDefault generates a new element id.
func (p *prefixedIDs) GenerateWithDefault(value, dft []byte) []byte {
result := common.CleanValue(value)
if len(result) == 0 {
result = dft
}
if !bytes.HasPrefix(result, []byte("user-content-")) {
result = append([]byte("user-content-"), result...)
}
if p.values.Add(util.UnsafeBytesToString(result)) {
return result
}
for i := 1; ; i++ {
newResult := fmt.Sprintf("%s-%d", result, i)
if p.values.Add(newResult) {
return []byte(newResult)
}
}
}
// Put puts a given element id to the used ids table.
func (p *prefixedIDs) Put(value []byte) {
p.values.Add(util.UnsafeBytesToString(value))
}
func newPrefixedIDs() *prefixedIDs {
return &prefixedIDs{
values: make(container.Set[string]),
}
}
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