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// 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;
}
// Tested on mac OS 10.12.6 and Windows 10 FCU, it renders as two separate characters
const baseFlagCodePoint = 127987; // parseInt('1F3F3', 16)
const rainbowCodePoint = 127752; // parseInt('1F308', 16)
function isRainbowFlagEmoji(emojiUnicode) {
const characters = Array.from(emojiUnicode);
// Length 4 because flags are made of 2 characters which are surrogate pairs
return (
emojiUnicode.length === 4 &&
characters[0].codePointAt(0) === baseFlagCodePoint &&
characters[1].codePointAt(0) === rainbowCodePoint
);
}
// 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 &&
Array.from(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) {
const firstCharacter = Array.from(emojiUnicode)[0];
return (
firstCharacter &&
firstCharacter.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;
Array.from(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);
const isRainbowFlagResult = isRainbowFlagEmoji(emojiUnicode);
return (
(unicodeSupportMap.flag && isFlagResult) ||
(unicodeSupportMap.rainbowFlag && isRainbowFlagResult) ||
(!isFlagResult && !isRainbowFlagResult)
);
}
// 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)
);
}
export {
isEmojiUnicodeSupported as default,
isFlagEmoji,
isRainbowFlagEmoji,
isKeycapEmoji,
isSkinToneComboEmoji,
isHorceRacingSkinToneComboEmoji,
isPersonZwjEmoji,
};
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