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make number of comparison in emojify() fewer (#4500)

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fix style

"©"削除処理をemojione_lightに移動
This commit is contained in:
MIYAGI Hikaru 2017-08-03 04:05:17 +09:00 committed by Eugen Rochko
parent 9ba7d526a0
commit 09e86ef90b
2 changed files with 23 additions and 27 deletions
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48
app/javascript/mastodon/emoji.js
View file

@ -3,34 +3,28 @@ import Trie from 'substring-trie';
const trie = new Trie(Object.keys(unicodeMapping));
const excluded = ['™', '©', '®'];
function emojify(str) {
// This walks through the string from start to end, ignoring any tags (<p>, <br>, etc.)
// and replacing valid unicode strings
// that _aren't_ within tags with an <img> version.
// The goal is to be the same as an emojione.regUnicode replacement, but faster.
let i = -1;
let insideTag = false;
let match;
while (++i < str.length) {
const char = str.charAt(i);
if (insideTag && char === '>') {
insideTag = false;
} else if (char === '<') {
insideTag = true;
} else if (!insideTag && (match = trie.search(str.substring(i)))) {
const unicodeStr = match;
if (unicodeStr in unicodeMapping && excluded.indexOf(unicodeStr) === -1) {
const [filename, shortCode] = unicodeMapping[unicodeStr];
const alt = unicodeStr;
const replacement = `<img draggable="false" class="emojione" alt="${alt}" title=":${shortCode}:" src="/emoji/${filename}.svg" />`;
str = str.substring(0, i) + replacement + str.substring(i + unicodeStr.length);
i += (replacement.length - unicodeStr.length); // jump ahead the length we've added to the string
}
const emojify = str => {
let rtn = '';
for (;;) {
let match, i = 0;
while (i < str.length && str[i] !== '<' && !(match = trie.search(str.slice(i)))) {
i += str.codePointAt(i) < 65536 ? 1 : 2;
}
if (i === str.length)
break;
else if (str[i] === '<') {
let tagend = str.indexOf('>', i + 1) + 1;
if (!tagend)
break;
rtn += str.slice(0, tagend);
str = str.slice(tagend);
} else {
const [filename, shortCode] = unicodeMapping[match];
rtn += str.slice(0, i) + `<img draggable="false" class="emojione" alt="${match}" title=":${shortCode}:" src="/emoji/${filename}.svg" />`;
str = str.slice(i + match.length);
}
}
return str;
}
return rtn + str;
};
export default emojify;

2
app/javascript/mastodon/emojione_light.js
View file

@ -4,8 +4,10 @@
const emojione = require('emojione');
const mappedUnicode = emojione.mapUnicodeToShort();
const excluded = ['®', '©', '™'];
module.exports.unicodeMapping = Object.keys(emojione.jsEscapeMap)
.filter(c => !excluded.includes(c))
.map(unicodeStr => [unicodeStr, mappedUnicode[emojione.jsEscapeMap[unicodeStr]]])
.map(([unicodeStr, shortCode]) => ({ [unicodeStr]: [emojione.emojioneList[shortCode].fname, shortCode.slice(1, shortCode.length - 1)] }))
.reduce((x, y) => Object.assign(x, y), { });