@technobuddha/library/src/unescape-c.test.ts

A large library of useful functions

import { unescapeC } from './unescape-c.ts';
import { space } from './unicode.ts';

describe('unescapeC', () => {
  test('should unescape standard sequences', () => {
    expect(unescapeC('\\a\\b\\f\\n\\r\\t\\v\\\\\\\'\\"\\?\\e')).toBe(
      '\u0007\b\f\n\r\t\v\\\'"?\u001B',
    );
  });

  test('should support non-standard sequences', () => {
    expect(unescapeC('\\j\\q\\z')).toBe('jqz');
  });

  test('should unescape octal', () => {
    expect(unescapeC('\\0')).toBe('\0');
    expect(unescapeC('\\00')).toBe('\0');
    expect(unescapeC('\\000')).toBe('\0');
    expect(unescapeC('\\0000')).toBe('\u00000');
  });

  test('should unescape hex', () => {
    expect(unescapeC('\\x0')).toBe('\0');
    expect(unescapeC('\\x00')).toBe('\0');
    expect(unescapeC('\\x000')).toBe('\0');
    expect(unescapeC('\\x0000')).toBe('\0');
    expect(unescapeC('\\x00000')).toBe('\0');
    expect(unescapeC('\\x000000')).toBe('\0');
    expect(unescapeC('\\x0000000')).toBe('\0');
    expect(unescapeC('\\x00000000')).toBe('\0');
    expect(unescapeC('\\x000000000')).toBe('\0');
    expect(unescapeC('\\x0X')).toBe('\0X');
    expect(unescapeC('\\x00X')).toBe('\0X');
    expect(unescapeC('\\x000X')).toBe('\0X');
    expect(unescapeC('\\x0000X')).toBe('\0X');
    expect(unescapeC('\\x00000X')).toBe('\0X');
    expect(unescapeC('\\x000000X')).toBe('\0X');
    expect(unescapeC('\\x0000000X')).toBe('\0X');
    expect(unescapeC('\\x00000000X')).toBe('\0X');
    expect(unescapeC('\\x000000000X')).toBe('\0X');
  });

  test('should unescape unicode', () => {
    expect(unescapeC('\\u0000')).toBe('\0');
    expect(unescapeC('\\u00000')).toBe('\u00000');
    expect(unescapeC('\\u0000X')).toBe('\0X');
  });

  test('should unescape extended unicode', () => {
    expect(unescapeC('\\U00000000')).toBe('\0');
    expect(unescapeC('\\U000000000')).toBe('\u00000');
    expect(unescapeC('\\U00000000X')).toBe('\0X');
  });

  test('should return ASCII, Latin1, BMP and ASTRAL as-is', () => {
    expect(unescapeC(space)).toBe(space);
    expect(unescapeC('ABCabc[~]')).toBe('ABCabc[~]');
    expect(unescapeC('abcdef')).toBe('abcdef');
    expect(unescapeC('¡¢£ýþÿ')).toBe('¡¢£ýþÿ');
    // cspell:ignore ΑΒΓΔΕΖ
    expect(unescapeC('ΑΒΓΔΕΖ')).toBe('ΑΒΓΔΕΖ');
    expect(unescapeC('😀😁😂😺😸😹')).toBe('😀😁😂😺😸😹');
  });
});