Faster emojify() by avoiding str.replace() entirely (#4049)
This commit is contained in:
Eugen Rochko
parent
331f0953e9
commit
e282580101
4 changed files with 71 additions and 37 deletions
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@ -1,60 +1,55 @@
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import emojione from 'emojione';
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import Trie from 'substring-trie';
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const toImage = str => shortnameToImage(unicodeToImage(str));
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const mappedUnicode = emojione.mapUnicodeToShort();
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const trie = new Trie(Object.keys(emojione.jsEscapeMap));
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const unicodeToImage = str => {
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const mappedUnicode = emojione.mapUnicodeToShort();
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return str.replace(emojione.regUnicode, unicodeChar => {
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if (typeof unicodeChar === 'undefined' || unicodeChar === '' || !(unicodeChar in emojione.jsEscapeMap)) {
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return unicodeChar;
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}
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const unicode = emojione.jsEscapeMap[unicodeChar];
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const short = mappedUnicode[unicode];
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const filename = emojione.emojioneList[short].fname;
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const alt = emojione.convert(unicode.toUpperCase());
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return `<img draggable="false" class="emojione" alt="${alt}" title="${short}" src="/emoji/${filename}.svg" />`;
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});
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};
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const shortnameToImage = str => {
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// This walks through the string from end to start, ignoring any tags (<p>, <br>, etc.)
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// and replacing valid shortnames like :smile: and :wink: that _aren't_ within
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// tags with an <img> version.
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// The goal is to be the same as an emojione.regShortNames replacement, but faster.
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// The reason we go backwards is because then we can replace substrings as we go.
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let i = str.length;
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function emojify(str) {
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// This walks through the string from start to end, ignoring any tags (<p>, <br>, etc.)
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// and replacing valid shortnames like :smile: and :wink: as well as unicode strings
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// that _aren't_ within tags with an <img> version.
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// The goal is to be the same as an emojione.regShortNames/regUnicode replacement, but faster.
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let i = -1;
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let insideTag = false;
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let insideShortname = false;
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let shortnameEndIndex = -1;
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while (i--) {
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let shortnameStartIndex = -1;
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let match;
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while (++i < str.length) {
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const char = str.charAt(i);
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if (insideShortname && char === ':') {
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const shortname = str.substring(i, shortnameEndIndex + 1);
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const shortname = str.substring(shortnameStartIndex, i + 1);
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if (shortname in emojione.emojioneList) {
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const unicode = emojione.emojioneList[shortname].unicode[emojione.emojioneList[shortname].unicode.length - 1];
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const alt = emojione.convert(unicode.toUpperCase());
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const replacement = `<img draggable="false" class="emojione" alt="${alt}" title="${shortname}" src="/emoji/${unicode}.svg" />`;
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str = str.substring(0, i) + replacement + str.substring(shortnameEndIndex + 1);
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str = str.substring(0, shortnameStartIndex) + replacement + str.substring(i + 1);
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i += (replacement.length - shortname.length - 1); // jump ahead the length we've added to the string
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} else {
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i++; // stray colon, try again
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i--; // stray colon, try again
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}
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insideShortname = false;
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} else if (insideTag && char === '<') {
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} else if (insideTag && char === '>') {
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insideTag = false;
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} else if (char === '>') {
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} else if (char === '<') {
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insideTag = true;
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insideShortname = false;
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} else if (!insideTag && char === ':') {
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insideShortname = true;
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shortnameEndIndex = i;
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shortnameStartIndex = i;
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} else if (!insideTag && (match = trie.search(str.substring(i)))) {
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const unicodeStr = match;
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if (unicodeStr in emojione.jsEscapeMap) {
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const unicode = emojione.jsEscapeMap[unicodeStr];
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const short = mappedUnicode[unicode];
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const filename = emojione.emojioneList[short].fname;
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const alt = emojione.convert(unicode.toUpperCase());
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const replacement = `<img draggable="false" class="emojione" alt="${alt}" title="${short}" src="/emoji/${filename}.svg" />`;
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str = str.substring(0, i) + replacement + str.substring(i + unicodeStr.length);
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i += (replacement.length - unicodeStr.length); // jump ahead the length we've added to the string
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}
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}
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}
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return str;
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};
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}
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export default function emojify(text) {
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return toImage(text);
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};
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export default emojify;
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@ -102,6 +102,7 @@
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"sass-loader": "^6.0.6",
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"stringz": "^0.2.2",
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"style-loader": "^0.18.2",
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"substring-trie": "^1.0.0",
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"throng": "^4.0.0",
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"tiny-queue": "^0.2.1",
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"uuid": "^3.1.0",
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@ -46,4 +46,38 @@ describe('emojify', () => {
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expect(emojify(':smile')).to.equal(':smile');
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});
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it('does two emoji next to each other', () => {
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expect(emojify(':smile::wink:')).to.equal(
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'<img draggable="false" class="emojione" alt="😄" title=":smile:" src="/emoji/1f604.svg" /><img draggable="false" class="emojione" alt="😉" title=":wink:" src="/emoji/1f609.svg" />');
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});
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it('does unicode', () => {
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expect(emojify('\uD83D\uDC69\u200D\uD83D\uDC69\u200D\uD83D\uDC66\u200D\uD83D\uDC66')).to.equal(
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'<img draggable="false" class="emojione" alt="👩👩👦👦" title=":family_wwbb:" src="/emoji/1f469-1f469-1f466-1f466.svg" />');
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expect(emojify('\uD83D\uDC68\uD83D\uDC69\uD83D\uDC67\uD83D\uDC67')).to.equal(
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'<img draggable="false" class="emojione" alt="👨👩👧👧" title=":family_mwgg:" src="/emoji/1f468-1f469-1f467-1f467.svg" />');
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expect(emojify('\uD83D\uDC69\uD83D\uDC69\uD83D\uDC66')).to.equal('<img draggable="false" class="emojione" alt="👩👩👦" title=":family_wwb:" src="/emoji/1f469-1f469-1f466.svg" />');
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expect(emojify('\u2757')).to.equal(
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'<img draggable="false" class="emojione" alt="❗" title=":exclamation:" src="/emoji/2757.svg" />');
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});
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it('does multiple unicode', () => {
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expect(emojify('\u2757 #\uFE0F\u20E3')).to.equal(
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'<img draggable="false" class="emojione" alt="❗" title=":exclamation:" src="/emoji/2757.svg" /> <img draggable="false" class="emojione" alt="#️⃣" title=":hash:" src="/emoji/0023-20e3.svg" />');
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expect(emojify('\u2757#\uFE0F\u20E3')).to.equal(
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'<img draggable="false" class="emojione" alt="❗" title=":exclamation:" src="/emoji/2757.svg" /><img draggable="false" class="emojione" alt="#️⃣" title=":hash:" src="/emoji/0023-20e3.svg" />');
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expect(emojify('\u2757 #\uFE0F\u20E3 \u2757')).to.equal(
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'<img draggable="false" class="emojione" alt="❗" title=":exclamation:" src="/emoji/2757.svg" /> <img draggable="false" class="emojione" alt="#️⃣" title=":hash:" src="/emoji/0023-20e3.svg" /> <img draggable="false" class="emojione" alt="❗" title=":exclamation:" src="/emoji/2757.svg" />');
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expect(emojify('foo \u2757 #\uFE0F\u20E3 bar')).to.equal(
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'foo <img draggable="false" class="emojione" alt="❗" title=":exclamation:" src="/emoji/2757.svg" /> <img draggable="false" class="emojione" alt="#️⃣" title=":hash:" src="/emoji/0023-20e3.svg" /> bar');
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});
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it('does mixed unicode and shortnames', () => {
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expect(emojify(':smile:#\uFE0F\u20E3:wink:\u2757')).to.equal('<img draggable="false" class="emojione" alt="😄" title=":smile:" src="/emoji/1f604.svg" /><img draggable="false" class="emojione" alt="#️⃣" title=":hash:" src="/emoji/0023-20e3.svg" /><img draggable="false" class="emojione" alt="😉" title=":wink:" src="/emoji/1f609.svg" /><img draggable="false" class="emojione" alt="❗" title=":exclamation:" src="/emoji/2757.svg" />');
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});
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it('ignores unicode inside of tags', () => {
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expect(emojify('<p data-foo="\uD83D\uDC69\uD83D\uDC69\uD83D\uDC66"></p>')).to.equal('<p data-foo="\uD83D\uDC69\uD83D\uDC69\uD83D\uDC66"></p>');
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});
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});
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@ -6819,6 +6819,10 @@ style-loader@^0.18.2:
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loader-utils "^1.0.2"
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schema-utils "^0.3.0"
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substring-trie@^1.0.0:
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version "1.0.0"
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resolved "https://registry.yarnpkg.com/substring-trie/-/substring-trie-1.0.0.tgz#5a7ecb83aefcca7b3720f7897cf69e97023be143"
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sugarss@^1.0.0:
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version "1.0.0"
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resolved "https://registry.yarnpkg.com/sugarss/-/sugarss-1.0.0.tgz#65e51b3958432fb70d5451a68bb33e32d0cf1ef7"
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