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cafb784799
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
94 lines
2 KiB
Go
94 lines
2 KiB
Go
// Copyright 2016 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package helpers
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import (
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"bytes"
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"github.com/kyokomi/emoji"
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"sync"
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)
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var (
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emojiInit sync.Once
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emojis = make(map[string][]byte)
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emojiDelim = []byte(":")
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emojiWordDelim = []byte(" ")
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emojiMaxSize int
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)
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// Emojify "emojifies" the input source.
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// Note that the input byte slice will be modified if needed.
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// See http://www.emoji-cheat-sheet.com/
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func Emojify(source []byte) []byte {
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emojiInit.Do(initEmoji)
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start := 0
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k := bytes.Index(source[start:], emojiDelim)
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for k != -1 {
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j := start + k
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upper := j + emojiMaxSize
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if upper > len(source) {
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upper = len(source)
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}
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endEmoji := bytes.Index(source[j+1:upper], emojiDelim)
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if endEmoji < 0 {
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break
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}
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nextWordDelim := bytes.Index(source[j:upper], emojiWordDelim)
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if endEmoji == 0 || (nextWordDelim != -1 && nextWordDelim < endEmoji) {
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start += endEmoji + 1
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} else {
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endKey := endEmoji + j + 2
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emojiKey := source[j:endKey]
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if emoji, ok := emojis[string(emojiKey)]; ok {
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source = append(source[:j], append(emoji, source[endKey:]...)...)
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}
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start += endEmoji
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}
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if start >= len(source) {
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break
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}
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k = bytes.Index(source[start:], emojiDelim)
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}
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return source
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}
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func initEmoji() {
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emojiMap := emoji.CodeMap()
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for k, v := range emojiMap {
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emojis[k] = []byte(v + emoji.ReplacePadding)
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if len(k) > emojiMaxSize {
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emojiMaxSize = len(k)
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}
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}
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}
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