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- const textUtils = require('../src/text-utils');
- describe('text utilities', () => {
- describe('.hasPairedCharacter(string)', () =>
- it('returns true when the string contains a surrogate pair, variation sequence, or combined character', () => {
- expect(textUtils.hasPairedCharacter('abc')).toBe(false);
- expect(textUtils.hasPairedCharacter('a\uD835\uDF97b\uD835\uDF97c')).toBe(
- true
- );
- expect(textUtils.hasPairedCharacter('\uD835\uDF97')).toBe(true);
- expect(textUtils.hasPairedCharacter('\u2714\uFE0E')).toBe(true);
- expect(textUtils.hasPairedCharacter('e\u0301')).toBe(true);
- expect(textUtils.hasPairedCharacter('\uD835')).toBe(false);
- expect(textUtils.hasPairedCharacter('\uDF97')).toBe(false);
- expect(textUtils.hasPairedCharacter('\uFE0E')).toBe(false);
- expect(textUtils.hasPairedCharacter('\u0301')).toBe(false);
- expect(textUtils.hasPairedCharacter('\uFE0E\uFE0E')).toBe(false);
- expect(textUtils.hasPairedCharacter('\u0301\u0301')).toBe(false);
- }));
- describe('.isPairedCharacter(string, index)', () =>
- it('returns true when the index is the start of a high/low surrogate pair, variation sequence, or combined character', () => {
- expect(
- textUtils.isPairedCharacter('a\uD835\uDF97b\uD835\uDF97c', 0)
- ).toBe(false);
- expect(
- textUtils.isPairedCharacter('a\uD835\uDF97b\uD835\uDF97c', 1)
- ).toBe(true);
- expect(
- textUtils.isPairedCharacter('a\uD835\uDF97b\uD835\uDF97c', 2)
- ).toBe(false);
- expect(
- textUtils.isPairedCharacter('a\uD835\uDF97b\uD835\uDF97c', 3)
- ).toBe(false);
- expect(
- textUtils.isPairedCharacter('a\uD835\uDF97b\uD835\uDF97c', 4)
- ).toBe(true);
- expect(
- textUtils.isPairedCharacter('a\uD835\uDF97b\uD835\uDF97c', 5)
- ).toBe(false);
- expect(
- textUtils.isPairedCharacter('a\uD835\uDF97b\uD835\uDF97c', 6)
- ).toBe(false);
- expect(textUtils.isPairedCharacter('a\u2714\uFE0E', 0)).toBe(false);
- expect(textUtils.isPairedCharacter('a\u2714\uFE0E', 1)).toBe(true);
- expect(textUtils.isPairedCharacter('a\u2714\uFE0E', 2)).toBe(false);
- expect(textUtils.isPairedCharacter('a\u2714\uFE0E', 3)).toBe(false);
- expect(textUtils.isPairedCharacter('\uD835')).toBe(false);
- expect(textUtils.isPairedCharacter('\uDF97')).toBe(false);
- expect(textUtils.isPairedCharacter('\uFE0E')).toBe(false);
- expect(textUtils.isPairedCharacter('\uFE0E')).toBe(false);
- expect(textUtils.isPairedCharacter('\uFE0E\uFE0E')).toBe(false);
- expect(textUtils.isPairedCharacter('ae\u0301c', 0)).toBe(false);
- expect(textUtils.isPairedCharacter('ae\u0301c', 1)).toBe(true);
- expect(textUtils.isPairedCharacter('ae\u0301c', 2)).toBe(false);
- expect(textUtils.isPairedCharacter('ae\u0301c', 3)).toBe(false);
- expect(textUtils.isPairedCharacter('ae\u0301c', 4)).toBe(false);
- }));
- describe('.isDoubleWidthCharacter(character)', () =>
- it('returns true when the character is either japanese, chinese or a full width form', () => {
- expect(textUtils.isDoubleWidthCharacter('我')).toBe(true);
- expect(textUtils.isDoubleWidthCharacter('私')).toBe(true);
- expect(textUtils.isDoubleWidthCharacter('B')).toBe(true);
- expect(textUtils.isDoubleWidthCharacter(',')).toBe(true);
- expect(textUtils.isDoubleWidthCharacter('¢')).toBe(true);
- expect(textUtils.isDoubleWidthCharacter('a')).toBe(false);
- }));
- describe('.isHalfWidthCharacter(character)', () =>
- it('returns true when the character is an half width form', () => {
- expect(textUtils.isHalfWidthCharacter('ハ')).toBe(true);
- expect(textUtils.isHalfWidthCharacter('ヒ')).toBe(true);
- expect(textUtils.isHalfWidthCharacter('ᆲ')).toBe(true);
- expect(textUtils.isHalfWidthCharacter('■')).toBe(true);
- expect(textUtils.isHalfWidthCharacter('B')).toBe(false);
- }));
- describe('.isKoreanCharacter(character)', () =>
- it('returns true when the character is a korean character', () => {
- expect(textUtils.isKoreanCharacter('우')).toBe(true);
- expect(textUtils.isKoreanCharacter('가')).toBe(true);
- expect(textUtils.isKoreanCharacter('ㅢ')).toBe(true);
- expect(textUtils.isKoreanCharacter('ㄼ')).toBe(true);
- expect(textUtils.isKoreanCharacter('O')).toBe(false);
- }));
- describe('.isWrapBoundary(previousCharacter, character)', () =>
- it('returns true when the character is CJK or when the previous character is a space/tab', () => {
- const anyCharacter = 'x';
- expect(textUtils.isWrapBoundary(anyCharacter, '我')).toBe(true);
- expect(textUtils.isWrapBoundary(anyCharacter, '私')).toBe(true);
- expect(textUtils.isWrapBoundary(anyCharacter, 'B')).toBe(true);
- expect(textUtils.isWrapBoundary(anyCharacter, ',')).toBe(true);
- expect(textUtils.isWrapBoundary(anyCharacter, '¢')).toBe(true);
- expect(textUtils.isWrapBoundary(anyCharacter, 'ハ')).toBe(true);
- expect(textUtils.isWrapBoundary(anyCharacter, 'ヒ')).toBe(true);
- expect(textUtils.isWrapBoundary(anyCharacter, 'ᆲ')).toBe(true);
- expect(textUtils.isWrapBoundary(anyCharacter, '■')).toBe(true);
- expect(textUtils.isWrapBoundary(anyCharacter, '우')).toBe(true);
- expect(textUtils.isWrapBoundary(anyCharacter, '가')).toBe(true);
- expect(textUtils.isWrapBoundary(anyCharacter, 'ㅢ')).toBe(true);
- expect(textUtils.isWrapBoundary(anyCharacter, 'ㄼ')).toBe(true);
- expect(textUtils.isWrapBoundary(' ', 'h')).toBe(true);
- expect(textUtils.isWrapBoundary('\t', 'h')).toBe(true);
- expect(textUtils.isWrapBoundary('a', 'h')).toBe(false);
- }));
- });
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