tests/ts/JavaScriptFlexBuffersTest.js

// Run this using JavaScriptTest.sh
import assert from 'assert'
import * as flexbuffers from 'flatbuffers/js/flexbuffers.js'
import fs from 'fs'

function main() {
  testSingleValueBuffers();
  testGoldBuffer();
  testEncode();
  testIndirectAdd();
  testIndirectWithCache();
  testMapBuilder();
  testRoundTrip();
  testRoundTripWithBuilder();
  testDeduplicationOff();
  testBugWhereOffestWereStoredAsIntInsteadOfUInt();
  testRootVector();

  console.log('FlexBuffers test: completed successfully');
}

function testRootVector() {
  // Root vector of strings
  const stringVec = ['a', 'b', 'c'];
  const bufStr = flexbuffers.encode(stringVec).buffer;
  const objStr = flexbuffers.toObject(bufStr);
  assert.deepStrictEqual(objStr, stringVec);

  // Root vector of numbers
  const numVec = [1, 2, 3, 4];
  const bufNum = flexbuffers.encode(numVec).buffer;
  const objNum = flexbuffers.toObject(bufNum);
  assert.deepStrictEqual(objNum, numVec);

  // Root vector of mixed types
  const mixedVec = ['x', 42, true, null];
  const bufMixed = flexbuffers.encode(mixedVec).buffer;
  const objMixed = flexbuffers.toObject(bufMixed);
  assert.deepStrictEqual(objMixed, mixedVec);
}

function testSingleValueBuffers() {
  {
    const ref = flexbuffers.toReference(new Uint8Array([0, 0, 1]).buffer);
    assert.strictEqual(true, ref.isNull());
  }

  function _assert(object, buffer) {
    assert.deepStrictEqual(
        flexbuffers.toObject(new Uint8Array(buffer).buffer), object);
  }
  _assert(true, [1, 104, 1]);
  _assert(false, [0, 104, 1]);
  _assert(25, [25, 4, 1]);
  _assert(-25, [231, 4, 1]);
  _assert(230, [230, 8, 1]);
  _assert(230, [230, 0, 5, 2]);
  _assert(-1025, [255, 251, 5, 2]);
  _assert(1025, [1, 4, 9, 2]);
  _assert(2147483647, [255, 255, 255, 127, 6, 4]);
  _assert(-2147483648, [0, 0, 0, 128, 6, 4]);
  _assert(4294967295n, [255, 255, 255, 255, 0, 0, 0, 0, 7, 8]);
  _assert(9223372036854775807n, [255, 255, 255, 255, 255, 255, 255, 127, 7, 8]);
  _assert(-9223372036854775808n, [0, 0, 0, 0, 0, 0, 0, 128, 7, 8]);
  _assert(
      18446744073709551615n, [255, 255, 255, 255, 255, 255, 255, 255, 11, 8]);
  _assert(4.5, [0, 0, 144, 64, 14, 4]);
  _assert(0.10000000149011612, [205, 204, 204, 61, 14, 4]);
  _assert(0.1, [154, 153, 153, 153, 153, 153, 185, 63, 15, 8]);
  _assert(-1025, [255, 251, 5, 2]);
  _assert('Maxim', [5, 77, 97, 120, 105, 109, 0, 6, 20, 1]);
  _assert(
      'hello 😱',
      [10, 104, 101, 108, 108, 111, 32, 240, 159, 152, 177, 0, 11, 20, 1]);
  _assert({a: 12}, [97, 0, 1, 3, 1, 1, 1, 12, 4, 2, 36, 1]);
  _assert(
      {'': 45, 'a': 12}, [0, 97, 0, 2, 4, 4, 2, 1, 2, 45, 12, 4, 4, 4, 36, 1]);
}

function testEncode() {
  function _assert(value, buffer) {
    assert.deepStrictEqual(flexbuffers.encode(value), new Uint8Array(buffer));
  }
  _assert(null, [0, 0, 1]);
  _assert(true, [1, 104, 1]);
  _assert(false, [0, 104, 1]);
  _assert(1, [1, 4, 1]);
  _assert(230, [230, 0, 5, 2]);
  _assert(1025, [1, 4, 5, 2]);
  _assert(-1025, [255, 251, 5, 2]);
  _assert(0x100000001, [1, 0, 0, 0, 1, 0, 0, 0, 7, 8]);
  _assert(0.1, [154, 153, 153, 153, 153, 153, 185, 63, 15, 8]);
  _assert(0.5, [0, 0, 0, 63, 14, 4]);
  _assert(new Uint8Array([1, 2, 3]), [3, 1, 2, 3, 3, 100, 1]);
  _assert('Maxim', [5, 77, 97, 120, 105, 109, 0, 6, 20, 1]);
  _assert(
      'hello 😱',
      [10, 104, 101, 108, 108, 111, 32, 240, 159, 152, 177, 0, 11, 20, 1]);
  _assert([1, 2], [1, 2, 2, 64, 1]);
  _assert([-1, 256], [255, 255, 0, 1, 4, 65, 1]);
  _assert([-45, 256000], [211, 255, 255, 255, 0, 232, 3, 0, 8, 66, 1]);
  _assert([1.1, -256.0], [
    2,  0, 0,   0,   0,   0,   0,   0,   154, 153, 153, 153, 153, 153, 241,
    63, 0, 255, 255, 255, 255, 255, 255, 255, 15,  5,   18,  43,  1
  ]);
  _assert([1, 2, 4], [1, 2, 4, 3, 76, 1]);
  _assert([-1, 256, 4], [255, 255, 0, 1, 4, 0, 6, 77, 1]);
  _assert([[61], 64], [1, 61, 2, 2, 64, 44, 4, 4, 40, 1]);
  _assert(['foo', 'bar', 'baz'], [
    3,  102, 111, 111, 0, 3,  98, 97, 114, 0,  3,
    98, 97,  122, 0,   3, 15, 11, 7,  3,   60, 1
  ]);
  _assert(['foo', 'bar', 'baz', 'foo', 'bar', 'baz'], [
    3,   102, 111, 111, 0,  3, 98, 97, 114, 0, 3,  98, 97,
    122, 0,   6,   15,  11, 7, 18, 14, 10,  6, 60, 1
  ]);
  _assert([true, false, true], [3, 1, 0, 1, 3, 144, 1]);
  _assert(['foo', 1, -5, 1.3, true], [
    3,   102, 111, 111, 0,   0,   0,   0,   5,   0,   0,   0,   0,
    0,   0,   0,   15,  0,   0,   0,   0,   0,   0,   0,   1,   0,
    0,   0,   0,   0,   0,   0,   251, 255, 255, 255, 255, 255, 255,
    255, 205, 204, 204, 204, 204, 204, 244, 63,  1,   0,   0,   0,
    0,   0,   0,   0,   20,  4,   4,   15,  104, 45,  43,  1
  ]);
  _assert([1, 3.3, 'max', true, null, false], [
    3,  109, 97, 120, 0, 0,  0,  0,   6, 0,   0,   0,   0,   0,   0,
    0,  1,   0,  0,   0, 0,  0,  0,   0, 102, 102, 102, 102, 102, 102,
    10, 64,  31, 0,   0, 0,  0,  0,   0, 0,   1,   0,   0,   0,   0,
    0,  0,   0,  0,   0, 0,  0,  0,   0, 0,   0,   0,   0,   0,   0,
    0,  0,   0,  0,   4, 15, 20, 104, 0, 104, 54,  43,  1
  ]);
  _assert({'a': 12}, [97, 0, 1, 3, 1, 1, 1, 12, 4, 2, 36, 1]);
  _assert(
      {'a': 12, '': 45}, [0, 97, 0, 2, 4, 4, 2, 1, 2, 45, 12, 4, 4, 4, 36, 1]);
  // JS currently does not support key vector offset sharing
  _assert([{'something': 12}, {'something': 45}], [
    115, 111, 109, 101, 116, 104, 105, 110, 103, 0, 1,  11, 1, 1,  1,
    12,  4,   6,   1,   1,   45,  4,   2,   8,   4, 36, 36, 4, 40, 1
  ]);
}

function testDeduplicationOff() {
  let buffer = flexbuffers.encode(
      [{'something': 12}, {'something': 45}], 1, true, true, false);
  assert.deepStrictEqual(
      buffer, new Uint8Array([
        115, 111, 109, 101, 116, 104, 105, 110, 103, 0,  1, 11, 1,  1, 1,  12,
        4,   1,   18,  1,   1,   1,   45,  4,   2,   10, 4, 36, 36, 4, 40, 1
      ]));

  buffer = flexbuffers.encode(
      [{'something': 12}, {'something': 45}], 1, true, false, false);
  assert.deepStrictEqual(
      buffer, new Uint8Array([
        115, 111, 109, 101, 116, 104, 105, 110, 103, 0,   1,   11,  1,  1,
        1,   12,  4,   115, 111, 109, 101, 116, 104, 105, 110, 103, 0,  1,
        11,  1,   1,   1,   45,  4,   2,   20,  4,   36,  36,  4,   40, 1
      ]));

  buffer = flexbuffers.encode(
      ['something', 'something', 'dark'], 1, true, false, false);
  assert.deepStrictEqual(
      buffer, new Uint8Array([
        9,   115, 111, 109, 101, 116, 104, 105, 110, 103, 0,  4,
        100, 97,  114, 107, 0,   3,   17,  18,  8,   3,   60, 1
      ]));

  buffer = flexbuffers.encode(
      ['something', 'something', 'dark'], 1, false, false, false);
  assert.deepStrictEqual(
      buffer, new Uint8Array([
        9,   115, 111, 109, 101, 116, 104, 105, 110, 103, 0, 9,
        115, 111, 109, 101, 116, 104, 105, 110, 103, 0,   4, 100,
        97,  114, 107, 0,   3,   28,  18,  8,   3,   60,  1
      ]));
}

function testIndirectAdd() {
  function _assertInt(buffer, value, indirect = false, cache = false) {
    const builder = flexbuffers.builder();
    builder.addInt(value, indirect, cache);
    const data = builder.finish();
    assert.deepStrictEqual(data, new Uint8Array(buffer));
  }
  function _assertUInt(buffer, value, indirect = false, cache = false) {
    const builder = flexbuffers.builder();
    builder.addUInt(value, indirect, cache);
    const data = builder.finish();
    assert.deepStrictEqual(data, new Uint8Array(buffer));
  }
  function _assertFloat(buffer, value, indirect = false, cache = false) {
    const builder = flexbuffers.builder();
    builder.addFloat(value, indirect, cache);
    const data = builder.finish();
    assert.deepStrictEqual(data, new Uint8Array(buffer));
  }
  _assertInt([0, 4, 1], 0);
  _assertInt([0, 1, 24, 1], 0, true);
  _assertInt([255, 0, 5, 2], 255);

  _assertUInt([0, 8, 1], 0);
  _assertUInt([0, 1, 28, 1], 0, true);
  _assertUInt([255, 8, 1], 255);

  _assertUInt([185, 115, 175, 118, 250, 84, 8, 0, 11, 8], 2345234523452345);
  _assertUInt(
      [185, 115, 175, 118, 250, 84, 8, 0, 8, 31, 1], 2345234523452345, true);
  _assertInt([185, 115, 175, 118, 250, 84, 8, 0, 7, 8], 2345234523452345);
  _assertInt(
      [185, 115, 175, 118, 250, 84, 8, 0, 8, 27, 1], 2345234523452345, true);

  _assertFloat([154, 153, 153, 153, 153, 153, 185, 63, 15, 8], 0.1);
  _assertFloat([154, 153, 153, 153, 153, 153, 185, 63, 8, 35, 1], 0.1, true);
  _assertFloat([0, 0, 0, 0, 14, 4], 0);
  _assertFloat([0, 0, 0, 0, 4, 34, 1], 0, true);
}

function testIndirectWithCache() {
  function _assertInt(buffer, values) {
    const builder = flexbuffers.builder();
    builder.startVector();
    values.forEach(v => {builder.addInt(v, true, true)});
    builder.end();
    const data = builder.finish();
    assert.deepStrictEqual(data, new Uint8Array(buffer));
  }

  function _assertUInt(buffer, values) {
    const builder = flexbuffers.builder();
    builder.startVector();
    values.forEach(v => {
      builder.addUInt(v, true, true);
    });
    builder.end();
    const data = builder.finish();
    assert.deepStrictEqual(data, new Uint8Array(buffer));
  }

  function _assertFloat(buffer, values) {
    const builder = flexbuffers.builder();
    builder.startVector();
    values.forEach(v => {
      builder.addFloat(v, true, true);
    });
    builder.end();
    const data = builder.finish();
    assert.deepStrictEqual(data, new Uint8Array(buffer));
  }

  _assertInt(
      [
        185, 115, 175, 118, 250, 84, 8,  0, 4,  9,
        10,  11,  12,  27,  27,  27, 27, 8, 40, 1
      ],
      [2345234523452345, 2345234523452345, 2345234523452345, 2345234523452345]);

  _assertUInt(
      [
        185, 115, 175, 118, 250, 84, 8,  0, 4,  9,
        10,  11,  12,  31,  31,  31, 31, 8, 40, 1
      ],
      [2345234523452345, 2345234523452345, 2345234523452345, 2345234523452345]);

  _assertFloat(
      [
        154, 153, 153, 153, 153, 153, 185, 63, 4,  9,
        10,  11,  12,  35,  35,  35,  35,  8,  40, 1
      ],
      [0.1, 0.1, 0.1, 0.1]);
}

function testMapBuilder() {
  const builder = flexbuffers.builder();
  builder.startMap();
  builder.addKey('a');
  builder.add(12);
  builder.addKey('');
  builder.add(45);
  builder.end();
  const data = builder.finish();
  assert.deepStrictEqual(
      data,
      new Uint8Array([97, 0, 0, 2, 2, 5, 2, 1, 2, 45, 12, 4, 4, 4, 36, 1]));
}

function testRoundTrip() {
  const example = {
    'age': 35,
    'flags': [true, false, true, true],
    'weight': 72.5,
    'name': 'Maxim',
    'address': {
      'city': 'Bla',
      'zip': '12345',
      'countryCode': 'XX',
    }
  };

  function _assert(value) {
    let buffer = flexbuffers.encode(value, 1);
    let o = flexbuffers.toObject(buffer.buffer);
    assert.deepStrictEqual(o, value);
  }

  _assert(example);
  _assert(0x100000001n);
  _assert({test_number: 72.6})
}

function testRoundTripWithBuilder() {
  const example = {
    'age': 35,
    'flags': [true, false, true, true],
    'weight': 72.5,
    'name': 'Maxim',
    'address': {
      'city': 'Bla',
      'zip': '12345',
      'countryCode': 'XX',
    }
  };

  const builder = flexbuffers.builder();
  builder.startMap();

  builder.addKey('age');
  builder.add(35);

  builder.addKey('flags');
  builder.startVector();
  builder.add(true);
  builder.add(false);
  builder.add(true);
  builder.add(true);
  builder.end();

  builder.addKey('weight');
  builder.add(72.5);

  builder.addKey('name');
  builder.add('Maxim');

  builder.addKey('address');

  builder.startMap();
  builder.addKey('city');
  builder.add('Bla');
  builder.addKey('zip');
  builder.add('12345');
  builder.addKey('countryCode');
  builder.add('XX');
  builder.end();

  builder.end();

  const data = builder.finish();
  let o = flexbuffers.toObject(data.buffer);
  assert.deepStrictEqual(o, example);

  let root = flexbuffers.toReference(data.buffer);
  assert.strictEqual(root.isMap(), true);
  assert.strictEqual(root.get('age').numericValue(), 35);
  assert.strictEqual(root.get('age').intValue(), 35);
  assert.strictEqual(root.get('name').stringValue(), 'Maxim');
  assert.strictEqual(root.get('weight').floatValue(), 72.5);
  assert.strictEqual(root.get('weight').numericValue(), 72.5);
  let flags = root.get('flags');
  assert.strictEqual(flags.isVector(), true);
  assert.strictEqual(flags.length(), 4);
  assert.strictEqual(flags.get(0).boolValue(), true);
  assert.strictEqual(flags.get(1).boolValue(), false);
  assert.strictEqual(flags.get(2).boolValue(), true);
  assert.strictEqual(flags.get(3).boolValue(), true);

  let address = root.get('address');
  assert.strictEqual(address.isMap(), true);
  assert.strictEqual(address.length(), 3);
  assert.strictEqual(address.get('city').stringValue(), 'Bla');
  assert.strictEqual(address.get('zip').stringValue(), '12345');
  assert.strictEqual(address.get('countryCode').stringValue(), 'XX');
}

function testGoldBuffer() {
  const data =
      new Uint8Array(fs.readFileSync('../gold_flexbuffer_example.bin')).buffer;
  const b1 = flexbuffers.toReference(data).get('bools').get(1);
  assert.strictEqual(b1.isBool(), true);
  assert.strictEqual(b1.boolValue(), false);

  const blob = flexbuffers.toReference(data).get('vec').get(3);
  assert.strictEqual(blob.isBlob(), true);
  assert.deepStrictEqual(blob.blobValue(), new Uint8Array([77]));

  const o = flexbuffers.toObject(data);
  assert.deepStrictEqual(o, {
    bool: true,
    bools: [true, false, true, false],
    bar: [1, 2, 3],
    bar3: [1, 2, 3],
    foo: 100,
    mymap: {foo: 'Fred'},
    vec: [-100, 'Fred', 4, new Uint8Array([77]), false, 4]
  });
}

function testBugWhereOffestWereStoredAsIntInsteadOfUInt() {
  // Reported in
  // https://github.com/google/flatbuffers/issues/5949#issuecomment-688421193
  const object = {
    'channels_in': 64,
    'dilation_height_factor': 1,
    'dilation_width_factor': 1,
    'fused_activation_function': 1,
    'pad_values': 1,
    'padding': 0,
    'stride_height': 1,
    'stride_width': 1
  };
  let data1 = flexbuffers.encode(object);
  const data = [
    99,  104, 97,  110, 110, 101, 108, 115, 95,  105, 110, 0,   100, 105, 108,
    97,  116, 105, 111, 110, 95,  104, 101, 105, 103, 104, 116, 95,  102, 97,
    99,  116, 111, 114, 0,   100, 105, 108, 97,  116, 105, 111, 110, 95,  119,
    105, 100, 116, 104, 95,  102, 97,  99,  116, 111, 114, 0,   102, 117, 115,
    101, 100, 95,  97,  99,  116, 105, 118, 97,  116, 105, 111, 110, 95,  102,
    117, 110, 99,  116, 105, 111, 110, 0,   112, 97,  100, 95,  118, 97,  108,
    117, 101, 115, 0,   112, 97,  100, 100, 105, 110, 103, 0,   115, 116, 114,
    105, 100, 101, 95,  104, 101, 105, 103, 104, 116, 0,   115, 116, 114, 105,
    100, 101, 95,  119, 105, 100, 116, 104, 0,   8,   130, 119, 97,  76,  51,
    41,  34,  21,  8,   1,   8,   64,  1,   1,   1,   1,   0,   1,   1,   4,
    4,   4,   4,   4,   4,   4,   4,   16,  36,  1
  ];
  let object2 = flexbuffers.toObject(new Uint8Array(data).buffer);
  let object1 = flexbuffers.toObject(new Uint8Array(data1).buffer);
  assert.deepStrictEqual(object, object2);
  assert.deepStrictEqual(object, object1);
  assert.strictEqual(data.length, data1.length);
  let ref = flexbuffers.toReference(new Uint8Array(data).buffer);
  assert.strictEqual(ref.isMap(), true);
  assert.strictEqual(ref.length(), 8);
  assert.strictEqual(ref.get('channels_in').numericValue(), 64);
  assert.strictEqual(ref.get('padding').isNumber(), true);
}

main();