mdg-filius/packages/fls/test/javaBeansWriter.test.ts

// The XMLDecoder format as javaBeansWriter.ts writes it, read by Java
// itself: every case is written to test/beans/<name>.xml (UPDATE_BEAN_CASES=1
// rewrites them), tools/java-oracle BeansDump reads each with XMLDecoder and
// describes what it got (beans.java.json). The descriptions must match the
// expectations written here by hand, and Java must report no error.

import { existsSync, readFileSync, writeFileSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';
import { describe, expect, it } from 'vitest';
import { decodeJavaBeans } from '../src/javabeans.js';
import {
  double,
  encodeJavaBeans,
  float,
  int,
  long,
  object,
  type BeanObject,
  type BeanValue,
} from '../src/javaBeansWriter.js';

const directory = join(dirname(fileURLToPath(import.meta.url)), 'beans');

const list = (className: string, items: BeanValue[]): BeanObject =>
  object(className, items.map((item) => ({ call: 'add', args: [item] })));
/** BeansDump's escaping: every unit outside printable ASCII, and the backslash, as backslash-u and four hex digits. */
const text = (value: string) => ({
  string: value.replace(/[^\x20-\x7E]|\\/g, (unit) => `\\u${unit.charCodeAt(0).toString(16).toUpperCase().padStart(4, '0')}`),
});
const bean = (className: string, properties: Record<string, unknown>) => ({ class: className, properties });
const items = (className: string, values: unknown[]) => ({ class: className, items: values });

const STRINGS = ['plain', '', '  spaced  ', '<&>"\'', ']]>', 'tab\there', 'line\nbreak', 'cr\rhere', 'crlf\r\nhere',
  '\u0000\u0001\u001F\u007F', '\u0085\u2028\u2029', '\uFEFFbom', 'Grüße 😀', 'lone \uD800 high', 'lone \uDC00 low', '\uFFFE\uFFFF'];

const inner = list('java.util.ArrayList', ['shared']);
const other = list('java.util.ArrayList', ['other']);
const file = object('filius.software.system.Datei', [
  { set: 'name', value: 'hosts' },
  { set: 'dateiTyp', value: 'text' },
  { set: 'dateiInhalt', value: 'a.de. A 3600 1.2.3.4\n' },
]);

const CASES: Record<string, { values: BeanValue[]; expected: unknown[] }> = {
  strings: {
    values: [list('java.util.LinkedList', STRINGS)],
    expected: [items('java.util.LinkedList', STRINGS.map(text))],
  },
  numbers: {
    values: [int(-1), int(2_147_483_647), long(-9_007_199_254_740_991), long(9_223_372_036_854_775_807n), double(0.1), double(-0),
      double(1e300), double(Number.NaN), double(-Infinity), float(1.5), { kind: 'short', value: -3 }, { kind: 'byte', value: 127 },
      { kind: 'char', value: 'x' }, { kind: 'char', value: '\u0001' }, true, false, null, { kind: 'class', name: 'java.lang.String' }],
    expected: [{ int: -1 }, { int: 2_147_483_647 }, { long: '-9007199254740991' }, { long: '9223372036854775807' }, { double: 0.1 },
      { double: -0 }, { double: 1e300 }, { double: Number.NaN }, { double: -Infinity }, { float: 1.5 }, { short: -3 }, { byte: 127 },
      { char: 120 }, { char: 1 }, true, false, null, { class: 'java.lang.String' }],
  },
  collections: {
    values: [
      list('java.util.Vector', [int(1), list('java.util.ArrayList', ['nested'])]),
      object('java.util.HashMap', [{ call: 'put', args: ['key', int(7)] }, { call: 'put', args: ['key', int(8)] }]),
    ],
    expected: [
      items('java.util.Vector', [{ int: 1 }, items('java.util.ArrayList', [text('nested')])]),
      { class: 'java.util.HashMap', entries: [[text('key'), { int: 8 }]] },
    ],
  },
  shared: {
    values: [list('java.util.LinkedList', [inner, other, inner, other]), file, file],
    expected: [
      {
        id: 0,
        class: 'java.util.LinkedList',
        items: [items('java.util.ArrayList', [text('shared')]), items('java.util.ArrayList', [text('other')]), { ref: 1 }, { ref: 2 }],
      },
      { id: 3, class: 'filius.software.system.Datei' },
      { ref: 3 },
    ],
  },
  awt: {
    values: [object('java.awt.Rectangle', [], [int(1), int(2), int(3), int(4)]), object('java.awt.Color', [], [int(10), int(20), int(30), int(40)])],
    expected: [{ rectangle: [1, 2, 3, 4] }, { color: [10, 20, 30, 40] }],
  },
  beans: {
    values: [
      file,
      object('filius.software.email.EmailKonto', [
        { set: 'benutzername', value: 'bob' },
        { set: 'passwort', value: null },
        { set: 'nachname', value: null },
        {
          get: 'nachrichten',
          statements: [
            {
              call: 'add',
              args: [
                object('filius.software.email.Email', [
                  { set: 'absender', value: object('filius.software.email.AddressEntry', [{ set: 'name', value: 'Alice' }, { set: 'mailAddress', value: 'a@x' }]) },
                  { get: 'empfaenger', statements: [{ call: 'add', args: [object('filius.software.email.AddressEntry', [{ set: 'mailAddress', value: 'b@y' }])] }] },
                  { set: 'betreff', value: 'Hi' },
                  { set: 'neu', value: false },
                ]),
              ],
            },
          ],
        },
      ]),
      object('filius.software.email.Kontakt', [{ set: 'hausnr', value: int(12) }, { set: 'name', value: 'Lang' }]),
    ],
    expected: [
      bean('filius.software.system.Datei', { name: text('hosts'), dateiTyp: text('text'), dateiInhalt: text('a.de. A 3600 1.2.3.4\n') }),
      bean('filius.software.email.EmailKonto', {
        benutzername: text('bob'),
        passwort: null,
        // setNachname keeps "" for null.
        nachname: text(''),
        nachrichten: items('java.util.LinkedList', [
          bean('filius.software.email.Email', {
            betreff: text('Hi'),
            neu: false,
            empfaenger: items('java.util.ArrayList', [bean('filius.software.email.AddressEntry', { name: null, mailAddress: text('b@y') })]),
          }),
        ]),
      }),
      bean('filius.software.email.Kontakt', { hausnr: { int: 12 }, name: text('Lang') }),
    ],
  },
  arrays: {
    values: [{ kind: 'array', componentClass: 'java.lang.String', items: ['a', null, 'c'] }, { kind: 'array', componentClass: 'int', items: [int(0), int(5)] }],
    expected: [items('[Ljava.lang.String;', [text('a'), null, text('c')]), items('[I', [{ int: 0 }, { int: 5 }])],
  },
  indexed: {
    values: [object('java.util.LinkedList', [
      { call: 'add', args: [object('filius.software.system.Datei', [{ set: 'name', value: 'first' }])] },
      { getIndex: 0, statements: [{ set: 'name', value: 'renamed' }] },
      { call: 'add', args: ['second'] },
      { setIndex: 1, value: 'replaced' },
    ])],
    expected: [items('java.util.LinkedList', [bean('filius.software.system.Datei', { name: text('renamed') }), text('replaced')])],
  },
  constants: {
    values: [{ kind: 'object', className: 'javax.swing.SwingConstants', staticField: 'CENTER' }],
    expected: [{ int: 0 }],
  },
};

/** Whether Java's description has everything expected: listed properties only, numbers by value, ids only where given. */
function matches(actual: unknown, expected: unknown): boolean {
  if (expected === null || typeof expected !== 'object') return Object.is(actual, expected);
  if (actual === null || typeof actual !== 'object') return false;
  const want = expected as Record<string, unknown>;
  const have = actual as Record<string, unknown>;
  for (const [key, value] of Object.entries(want)) {
    if ((key === 'double' || key === 'float') && typeof have[key] === 'string') {
      if (!Object.is(Number(have[key]), value)) return false;
      continue;
    }
    if (Array.isArray(value)) {
      const list = have[key];
      if (!Array.isArray(list) || list.length !== value.length || !value.every((item, index) => matches(list[index], item))) return false;
      continue;
    }
    if (!(key in have) || !matches(have[key], value)) return false;
  }
  return true;
}

const javaDump = existsSync(join(directory, 'beans.java.json'))
  ? (JSON.parse(readFileSync(join(directory, 'beans.java.json'), 'utf8')) as Record<string, { values: unknown[]; errors: string[] }>)
  : {};

describe('javaBeansWriter, read by Java', () => {
  for (const [name, { values, expected }] of Object.entries(CASES)) {
    it(name, () => {
      const path = join(directory, `${name}.xml`);
      const xml = encodeJavaBeans(values);
      if (process.env.UPDATE_BEAN_CASES === '1') writeFileSync(path, xml);
      expect(readFileSync(path, 'utf8')).toBe(xml);
      const java = javaDump[`${name}.xml`];
      expect(java?.errors).toEqual([]);
      expect(java!.values).toHaveLength(expected.length);
      java!.values.forEach((value, index) => {
        expect(matches(value, expected[index]), `value ${index}: ${JSON.stringify(value)}`).toBe(true);
      });
    });
  }

  it('reads back with the reader of this package', () => {
    expect(decodeJavaBeans(encodeJavaBeans(CASES.strings!.values))).toEqual([
      expect.objectContaining({ calls: STRINGS.map((value) => ({ method: 'add', args: [value] })) }),
    ]);
  });
});