46 lines
1.1 KiB
TypeScript
46 lines
1.1 KiB
TypeScript
// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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export type SplitTextOptionsType = Readonly<{
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granularity: 'grapheme' | 'word';
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shouldBreak: (slice: string) => boolean;
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}>;
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export function splitText(
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text: string,
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{ granularity, shouldBreak }: SplitTextOptionsType
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): Array<string> {
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const isWordBased = granularity === 'word';
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const segmenter = new Intl.Segmenter(undefined, {
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granularity,
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});
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const result = new Array<string>();
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// Compute number of lines and height of text
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let acc = '';
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let best = '';
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for (const { segment, isWordLike } of segmenter.segment(text)) {
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acc += segment;
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// For "grapheme" segmenting, "isWordLike" is always "undefined"
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if (isWordLike === false) {
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best = acc;
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continue;
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}
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if (shouldBreak(isWordBased ? acc.trim() : acc)) {
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result.push(best);
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acc = acc.slice(best.length);
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best = acc;
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} else {
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best = acc;
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}
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}
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if (best) {
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result.push(best);
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}
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return isWordBased ? result.map(x => x.trim()) : result;
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}
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