hugo/helpers/emoji.go
Bjørn Erik Pedersen cafb784799 Add emoji support
This uses the Emoji map from https://github.com/kyokomi/emoji -- but with a custom replacement implementation.

The built-in are fine for most use cases, but in Hugo we do care about pure speed.

The benchmarks below are skewed in Hugo's direction as the source and result is a byte slice,
Kyokomi's implementation works best with strings.

Curious: The easy-to-use `strings.Replacer` is also plenty fast.

```
BenchmarkEmojiKyokomiFprint-4  	   20000	     86038 ns/op	   33960 B/op	     117 allocs/op
BenchmarkEmojiKyokomiSprint-4  	   20000	     83252 ns/op	   38232 B/op	     122 allocs/op
BenchmarkEmojiStringsReplacer-4	  100000	     21092 ns/op	   17248 B/op	      25 allocs/op
BenchmarkHugoEmoji-4           	  500000	      5728 ns/op	     624 B/op	      13 allocs/op
```

Fixes #1891
2016-03-11 15:51:37 -06:00

94 lines
2 KiB
Go

// Copyright 2016 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 helpers
import (
"bytes"
"github.com/kyokomi/emoji"
"sync"
)
var (
emojiInit sync.Once
emojis = make(map[string][]byte)
emojiDelim = []byte(":")
emojiWordDelim = []byte(" ")
emojiMaxSize int
)
// Emojify "emojifies" the input source.
// Note that the input byte slice will be modified if needed.
// See http://www.emoji-cheat-sheet.com/
func Emojify(source []byte) []byte {
emojiInit.Do(initEmoji)
start := 0
k := bytes.Index(source[start:], emojiDelim)
for k != -1 {
j := start + k
upper := j + emojiMaxSize
if upper > len(source) {
upper = len(source)
}
endEmoji := bytes.Index(source[j+1:upper], emojiDelim)
if endEmoji < 0 {
break
}
nextWordDelim := bytes.Index(source[j:upper], emojiWordDelim)
if endEmoji == 0 || (nextWordDelim != -1 && nextWordDelim < endEmoji) {
start += endEmoji + 1
} else {
endKey := endEmoji + j + 2
emojiKey := source[j:endKey]
if emoji, ok := emojis[string(emojiKey)]; ok {
source = append(source[:j], append(emoji, source[endKey:]...)...)
}
start += endEmoji
}
if start >= len(source) {
break
}
k = bytes.Index(source[start:], emojiDelim)
}
return source
}
func initEmoji() {
emojiMap := emoji.CodeMap()
for k, v := range emojiMap {
emojis[k] = []byte(v + emoji.ReplacePadding)
if len(k) > emojiMaxSize {
emojiMaxSize = len(k)
}
}
}