nyastodon/app/assets/javascripts/components/rtl.jsx

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// U+0590 to U+05FF - Hebrew
// U+0600 to U+06FF - Arabic
// U+0700 to U+074F - Syriac
// U+0750 to U+077F - Arabic Supplement
// U+0780 to U+07BF - Thaana
// U+07C0 to U+07FF - N'Ko
// U+0800 to U+083F - Samaritan
// U+08A0 to U+08FF - Arabic Extended-A
// U+FB1D to U+FB4F - Hebrew presentation forms
// U+FB50 to U+FDFF - Arabic presentation forms A
// U+FE70 to U+FEFF - Arabic presentation forms B
const rtlChars = /[\u0590-\u083F]|[\u08A0-\u08FF]|[\uFB1D-\uFDFF]|[\uFE70-\uFEFF]/mg;
export function isRtl(text) {
if (text.length === 0) {
return false;
}
const matches = text.match(rtlChars);
if (!matches) {
return false;
}
return matches.length / text.trim().length > 0.3;
};