98 lines
2.9 KiB
TypeScript
98 lines
2.9 KiB
TypeScript
// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { assert } from 'chai';
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import {
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FIRST_STRONG_ISOLATE as FSI,
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POP_DIRECTIONAL_ISOLATE as PSI,
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LTR_ISOLATE,
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POP_DIRECTIONAL_FORMATTING,
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RTL_ISOLATE,
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_bidiIsolate,
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LTR_EMBEDDING,
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LTR_OVERRIDE,
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RTL_EMBEDDING,
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RTL_OVERRIDE,
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} from '../../util/unicodeBidi';
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function debugUnicode(text: string) {
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return text
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.split('')
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.map(char => char.charCodeAt(0).toString(16))
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.join(' ');
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}
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function assertEqual(actual: string, expected: string) {
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assert.equal(debugUnicode(actual), debugUnicode(expected));
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}
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describe('_bidiIsolate', () => {
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it('returns a string with bidi isolate characters', () => {
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const actual = _bidiIsolate('Hello');
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assertEqual(actual, `${FSI}Hello${PSI}`);
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});
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it('strips unopened pop isolate characters', () => {
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const actual = _bidiIsolate(`${PSI}Hello`);
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assertEqual(actual, `${FSI}Hello${PSI}`);
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});
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it('strips unopened pop formatting characters', () => {
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const actual = _bidiIsolate(`${POP_DIRECTIONAL_FORMATTING}Hello`);
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assertEqual(actual, `${FSI}Hello${PSI}`);
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});
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it('closes isolates that were left open', () => {
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const actual = _bidiIsolate(`${LTR_ISOLATE}${RTL_ISOLATE}${FSI}Hello`);
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assertEqual(
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actual,
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`${FSI}${LTR_ISOLATE}${RTL_ISOLATE}${FSI}Hello${PSI}${PSI}${PSI}${PSI}`
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);
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});
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it('closes overrides that were left open', () => {
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const actual = _bidiIsolate(`${LTR_OVERRIDE}${RTL_OVERRIDE}Hello`);
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assertEqual(
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actual,
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`${FSI}${LTR_OVERRIDE}${RTL_OVERRIDE}Hello${POP_DIRECTIONAL_FORMATTING}${POP_DIRECTIONAL_FORMATTING}${PSI}`
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);
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});
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it('closes formatting that was left open', () => {
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const actual = _bidiIsolate(`${LTR_EMBEDDING}${RTL_EMBEDDING}Hello`);
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assertEqual(
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actual,
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`${FSI}${LTR_EMBEDDING}${RTL_EMBEDDING}Hello${POP_DIRECTIONAL_FORMATTING}${POP_DIRECTIONAL_FORMATTING}${PSI}`
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);
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});
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it('leaves properly balanced isolates alone', () => {
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const actual = _bidiIsolate(
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`${FSI}${LTR_ISOLATE}${RTL_ISOLATE}${PSI}${PSI}${PSI}Hello`
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);
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assertEqual(
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actual,
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`${FSI}${FSI}${LTR_ISOLATE}${RTL_ISOLATE}${PSI}${PSI}${PSI}Hello${PSI}`
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);
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});
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it('leaves properly balanced overrides alone', () => {
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const actual = _bidiIsolate(
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`${LTR_OVERRIDE}${RTL_OVERRIDE}${POP_DIRECTIONAL_FORMATTING}${POP_DIRECTIONAL_FORMATTING}Hello`
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);
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assertEqual(
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actual,
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`${FSI}${LTR_OVERRIDE}${RTL_OVERRIDE}${POP_DIRECTIONAL_FORMATTING}${POP_DIRECTIONAL_FORMATTING}Hello${PSI}`
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);
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});
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it('leaves properly balanced formatting alone', () => {
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const actual = _bidiIsolate(
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`${LTR_EMBEDDING}${RTL_EMBEDDING}${POP_DIRECTIONAL_FORMATTING}${POP_DIRECTIONAL_FORMATTING}Hello`
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);
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assertEqual(
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actual,
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`${FSI}${LTR_EMBEDDING}${RTL_EMBEDDING}${POP_DIRECTIONAL_FORMATTING}${POP_DIRECTIONAL_FORMATTING}Hello${PSI}`
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);
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});
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});
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