Eric Bailey
34 lines
1.1 KiB
TypeScript
34 lines
1.1 KiB
TypeScript
import {IS_WEB} from '#/env'
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const LEFT_TO_RIGHT_EMBEDDING = '\u202A'
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const POP_DIRECTIONAL_FORMATTING = '\u202C'
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/*
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* Force LTR directionality in a string.
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* https://www.unicode.org/reports/tr9/#Directional_Formatting_Characters
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*
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* On web, direction is isolated with CSS instead (direction: ltr + unicode-bidi:
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* isolate on the surrounding Text), so these invisible control characters are not
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* injected. Injecting them leaks the characters into the rendered text, where
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* they end up in copy-paste and break handle lookups in other apps and tools
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* (#8451). Native has no equivalent CSS, so the manual wrapping is kept there.
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*/
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export function forceLTR(str: string) {
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if (IS_WEB) return str
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return LEFT_TO_RIGHT_EMBEDDING + str + POP_DIRECTIONAL_FORMATTING
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}
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/**
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* Determines whether a BCP 47 language tag uses a right-to-left script.
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*/
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export function isRTL(language: string | undefined) {
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if (!language) return false
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try {
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return new Intl.Locale(language).getTextInfo().direction === 'rtl'
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} catch (error) {
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if (error instanceof RangeError) return false
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throw error
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}
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}
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