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Diffstat (limited to 'markup/blackfriday/anchors.go')
-rw-r--r-- | markup/blackfriday/anchors.go | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/markup/blackfriday/anchors.go b/markup/blackfriday/anchors.go new file mode 100644 index 000000000..90f65a64c --- /dev/null +++ b/markup/blackfriday/anchors.go @@ -0,0 +1,39 @@ +// Copyright 2022 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 blackfriday holds some copmpability functions for the old Blackfriday v1 Markdown engine. +package blackfriday + +import "unicode" + +// SanitizedAnchorName is how Blackfriday sanitizes anchor names. +// Implementation borrowed from https://github.com/russross/blackfriday/blob/a477dd1646916742841ed20379f941cfa6c5bb6f/block.go#L1464 +// Note that Hugo removed its Blackfriday support in v0.100.0, but you can still use this strategy for +// auto ID generation. +func SanitizedAnchorName(text string) string { + var anchorName []rune + futureDash := false + for _, r := range text { + switch { + case unicode.IsLetter(r) || unicode.IsNumber(r): + if futureDash && len(anchorName) > 0 { + anchorName = append(anchorName, '-') + } + futureDash = false + anchorName = append(anchorName, unicode.ToLower(r)) + default: + futureDash = true + } + } + return string(anchorName) +} |