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// Copyright 2019 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package goldmark
import (
"bytes"
"strconv"
"unicode"
"unicode/utf8"
"github.com/gohugoio/hugo/common/text"
"github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/parser"
"github.com/yuin/goldmark/util"
bp "github.com/gohugoio/hugo/bufferpool"
)
func sanitizeAnchorNameString(s string, asciiOnly bool) string {
return string(sanitizeAnchorName([]byte(s), asciiOnly))
}
func sanitizeAnchorName(b []byte, asciiOnly bool) []byte {
return sanitizeAnchorNameWithHook(b, asciiOnly, nil)
}
func sanitizeAnchorNameWithHook(b []byte, asciiOnly bool, hook func(buf *bytes.Buffer)) []byte {
buf := bp.GetBuffer()
if asciiOnly {
// Normalize it to preserve accents if possible.
b = text.RemoveAccents(b)
}
for len(b) > 0 {
r, size := utf8.DecodeRune(b)
switch {
case asciiOnly && size != 1:
case isSpace(r):
buf.WriteString("-")
case r == '-' || isAlphaNumeric(r):
buf.WriteRune(unicode.ToLower(r))
default:
}
b = b[size:]
}
if hook != nil {
hook(buf)
}
result := make([]byte, buf.Len())
copy(result, buf.Bytes())
bp.PutBuffer(buf)
return result
}
func isAlphaNumeric(r rune) bool {
return r == '_' || unicode.IsLetter(r) || unicode.IsDigit(r)
}
func isSpace(r rune) bool {
return r == ' ' || r == '\t'
}
var _ parser.IDs = (*idFactory)(nil)
type idFactory struct {
asciiOnly bool
vals map[string]struct{}
}
func newIDFactory(asciiOnly bool) *idFactory {
return &idFactory{
vals: make(map[string]struct{}),
asciiOnly: asciiOnly,
}
}
func (ids *idFactory) Generate(value []byte, kind ast.NodeKind) []byte {
return sanitizeAnchorNameWithHook(value, ids.asciiOnly, func(buf *bytes.Buffer) {
if buf.Len() == 0 {
if kind == ast.KindHeading {
buf.WriteString("heading")
} else {
buf.WriteString("id")
}
}
if _, found := ids.vals[util.BytesToReadOnlyString(buf.Bytes())]; found {
// Append a hypen and a number, starting with 1.
buf.WriteRune('-')
pos := buf.Len()
for i := 1; ; i++ {
buf.WriteString(strconv.Itoa(i))
if _, found := ids.vals[util.BytesToReadOnlyString(buf.Bytes())]; !found {
break
}
buf.Truncate(pos)
}
}
ids.vals[buf.String()] = struct{}{}
})
}
func (ids *idFactory) Put(value []byte) {
ids.vals[util.BytesToReadOnlyString(value)] = struct{}{}
}
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