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const installCustomElements = require('document-register-element');
const emojiMap = require('emoji-map');
const emojiAliases = require('emoji-aliases');
const generatedUnicodeSupportMap = require('./gl_emoji/unicode_support_map');
const spreadString = require('./gl_emoji/spread_string');
installCustomElements(window);
function emojiImageTag(name, src) {
return `<img class="emoji" title=":${name}:" alt=":${name}:" src="${src}" width="20" height="20" align="absmiddle" />`;
}
const glEmojiTagDefaults = {
sprite: false,
forceFallback: false,
};
function glEmojiTag(inputName, options) {
const opts = Object.assign({}, glEmojiTagDefaults, options);
const name = emojiAliases[inputName] || inputName;
const emojiInfo = emojiMap[name];
const fallbackImageSrc = `${gon.relative_url_root || ''}/assets/emoji/${name}-${emojiInfo.digest}.png`;
const fallbackSpriteClass = `emoji-${name}`;
const classList = [];
if (opts.forceFallback && opts.sprite) {
classList.push('emoji-icon');
classList.push(fallbackSpriteClass);
}
const classAttribute = classList.length > 0 ? `class="${classList.join(' ')}"` : '';
const fallbackSpriteAttribute = opts.sprite ? `data-fallback-sprite-class="${fallbackSpriteClass}"` : '';
let contents = emojiInfo.moji;
if (opts.forceFallback && !opts.sprite) {
contents = emojiImageTag(name, fallbackImageSrc);
}
return `
<gl-emoji
${classAttribute}
data-name="${name}"
data-fallback-src="${fallbackImageSrc}"
${fallbackSpriteAttribute}
data-unicode-version="${emojiInfo.unicodeVersion}"
>
${contents}
</gl-emoji>
`;
}
// On Windows, flags render as two-letter country codes, see http://emojipedia.org/flags/
const flagACodePoint = 127462; // parseInt('1F1E6', 16)
const flagZCodePoint = 127487; // parseInt('1F1FF', 16)
function isFlagEmoji(emojiUnicode) {
const cp = emojiUnicode.codePointAt(0);
// Length 4 because flags are made of 2 characters which are surrogate pairs
return emojiUnicode.length === 4 && cp >= flagACodePoint && cp <= flagZCodePoint;
}
// Chrome <57 renders keycaps oddly
// See https://bugs.chromium.org/p/chromium/issues/detail?id=632294
// Same issue on Windows also fixed in Chrome 57, http://i.imgur.com/rQF7woO.png
function isKeycapEmoji(emojiUnicode) {
return emojiUnicode.length === 3 && emojiUnicode[2] === '\u20E3';
}
// Check for a skin tone variation emoji which aren't always supported
const tone1 = 127995;// parseInt('1F3FB', 16)
const tone5 = 127999;// parseInt('1F3FF', 16)
function isSkinToneComboEmoji(emojiUnicode) {
return emojiUnicode.length > 2 && spreadString(emojiUnicode).some((char) => {
const cp = char.codePointAt(0);
return cp >= tone1 && cp <= tone5;
});
}
// macOS supports most skin tone emoji's but
// doesn't support the skin tone versions of horse racing
const horseRacingCodePoint = 127943;// parseInt('1F3C7', 16)
function isHorceRacingSkinToneComboEmoji(emojiUnicode) {
return spreadString(emojiUnicode)[0].codePointAt(0) === horseRacingCodePoint &&
isSkinToneComboEmoji(emojiUnicode);
}
// Check for `family_*`, `kiss_*`, `couple_*`
// For ex. Windows 8.1 Firefox 51.0.1, doesn't support these
const zwj = 8205; // parseInt('200D', 16)
const personStartCodePoint = 128102; // parseInt('1F466', 16)
const personEndCodePoint = 128105; // parseInt('1F469', 16)
function isPersonZwjEmoji(emojiUnicode) {
let hasPersonEmoji = false;
let hasZwj = false;
spreadString(emojiUnicode).forEach((character) => {
const cp = character.codePointAt(0);
if (cp === zwj) {
hasZwj = true;
} else if (cp >= personStartCodePoint && cp <= personEndCodePoint) {
hasPersonEmoji = true;
}
});
return hasPersonEmoji && hasZwj;
}
// Helper so we don't have to run `isFlagEmoji` twice
// in `isEmojiUnicodeSupported` logic
function checkFlagEmojiSupport(unicodeSupportMap, emojiUnicode) {
const isFlagResult = isFlagEmoji(emojiUnicode);
return (
(unicodeSupportMap.flag && isFlagResult) ||
!isFlagResult
);
}
// Helper so we don't have to run `isSkinToneComboEmoji` twice
// in `isEmojiUnicodeSupported` logic
function checkSkinToneModifierSupport(unicodeSupportMap, emojiUnicode) {
const isSkinToneResult = isSkinToneComboEmoji(emojiUnicode);
return (
(unicodeSupportMap.skinToneModifier && isSkinToneResult) ||
!isSkinToneResult
);
}
// Helper func so we don't have to run `isHorceRacingSkinToneComboEmoji` twice
// in `isEmojiUnicodeSupported` logic
function checkHorseRacingSkinToneComboEmojiSupport(unicodeSupportMap, emojiUnicode) {
const isHorseRacingSkinToneResult = isHorceRacingSkinToneComboEmoji(emojiUnicode);
return (
(unicodeSupportMap.horseRacing && isHorseRacingSkinToneResult) ||
!isHorseRacingSkinToneResult
);
}
// Helper so we don't have to run `isPersonZwjEmoji` twice
// in `isEmojiUnicodeSupported` logic
function checkPersonEmojiSupport(unicodeSupportMap, emojiUnicode) {
const isPersonZwjResult = isPersonZwjEmoji(emojiUnicode);
return (
(unicodeSupportMap.personZwj && isPersonZwjResult) ||
!isPersonZwjResult
);
}
// Takes in a support map and determines whether
// the given unicode emoji is supported on the platform.
//
// Combines all the edge case tests into a one-stop shop method
function isEmojiUnicodeSupported(unicodeSupportMap = {}, emojiUnicode, unicodeVersion) {
const isOlderThanChrome57 = unicodeSupportMap.meta && unicodeSupportMap.meta.isChrome &&
unicodeSupportMap.meta.chromeVersion < 57;
// For comments about each scenario, see the comments above each individual respective function
return unicodeSupportMap[unicodeVersion] &&
!(isOlderThanChrome57 && isKeycapEmoji(emojiUnicode)) &&
checkFlagEmojiSupport(unicodeSupportMap, emojiUnicode) &&
checkSkinToneModifierSupport(unicodeSupportMap, emojiUnicode) &&
checkHorseRacingSkinToneComboEmojiSupport(unicodeSupportMap, emojiUnicode) &&
checkPersonEmojiSupport(unicodeSupportMap, emojiUnicode);
}
const GlEmojiElementProto = Object.create(HTMLElement.prototype);
GlEmojiElementProto.createdCallback = function createdCallback() {
const emojiUnicode = this.textContent.trim();
const {
unicodeVersion,
fallbackSrc,
fallbackSpriteClass,
} = this.dataset;
const isEmojiUnicode = this.childNodes && Array.prototype.every.call(
this.childNodes,
childNode => childNode.nodeType === 3,
);
const hasImageFallback = fallbackSrc && fallbackSrc.length > 0;
const hasCssSpriteFalback = fallbackSpriteClass && fallbackSpriteClass.length > 0;
if (
isEmojiUnicode &&
!isEmojiUnicodeSupported(generatedUnicodeSupportMap, emojiUnicode, unicodeVersion)
) {
// CSS sprite fallback takes precedence over image fallback
if (hasCssSpriteFalback) {
// IE 11 doesn't like adding multiple at once :(
this.classList.add('emoji-icon');
this.classList.add(fallbackSpriteClass);
} else if (hasImageFallback) {
const emojiName = this.dataset.name;
this.innerHTML = emojiImageTag(emojiName, fallbackSrc);
}
}
};
document.registerElement('gl-emoji', {
prototype: GlEmojiElementProto,
});
module.exports = {
emojiImageTag,
glEmojiTag,
isEmojiUnicodeSupported,
isFlagEmoji,
isKeycapEmoji,
isSkinToneComboEmoji,
isHorceRacingSkinToneComboEmoji,
isPersonZwjEmoji,
};
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