chrome-devtools-frontend/front_end/core/common/Trie.test.ts

Chrome DevTools UI

// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as Common from './common.js';

const Trie = Common.Trie.Trie;

describe('Trie<string>', () => {
  let trie: Common.Trie.Trie<string>;
  beforeEach(() => {
    trie = Trie.newStringTrie();
  });

  it('stores and retrieves words', () => {
    trie.add('foo');
    assert.isTrue(trie.has('foo'));
    assert.isFalse(trie.has('bar'));
  });

  it('removes words', () => {
    trie.add('foo');
    assert.isTrue(trie.has('foo'));
    trie.remove('foo');
    assert.isFalse(trie.has('foo'));
  });

  it('completes words based on prefixes', () => {
    trie.add('foo');
    trie.add('food');
    trie.add('flora');
    trie.add('boat');
    trie.add('focus');
    trie.add('banana');
    assert.deepEqual(trie.words('fo'), ['foo', 'food', 'focus']);
    assert.isEmpty(trie.words('cat'));
  });

  it('clears words', () => {
    trie.add('foo');
    assert.isTrue(trie.has('foo'));

    trie.clear();
    assert.isFalse(trie.has('foo'));
    assert.isEmpty(trie.words('foo'));
  });

  it('provides the longest prefix', () => {
    trie.add('super');
    trie.add('supercar');

    // Longest non-word prefix match.
    assert.strictEqual(trie.longestPrefix('supercalifragilisticexpialidocious', false), 'superca');

    // Longest word prefix match.
    assert.strictEqual(trie.longestPrefix('supercalifragilisticexpialidocious', true), 'super');
  });
});

// Same tests as above but we use arrays of single letters instead.
describe('Trie<string[]>', () => {
  let trie: Common.Trie.Trie<string[]>;
  beforeEach(() => {
    trie = Trie.newArrayTrie<string[]>();
  });

  it('stores and retrieves words', () => {
    trie.add([...'foo']);
    assert.isTrue(trie.has([...'foo']));
    assert.isFalse(trie.has([...'bar']));
  });

  it('removes words', () => {
    trie.add([...'foo']);
    assert.isTrue(trie.has([...'foo']));
    trie.remove([...'foo']);
    assert.isFalse(trie.has([...'foo']));
  });

  it('completes words based on prefixes', () => {
    trie.add([...'foo']);
    trie.add([...'food']);
    trie.add([...'flora']);
    trie.add([...'boat']);
    trie.add([...'focus']);
    trie.add([...'banana']);
    assert.deepEqual(trie.words([...'fo']), [[...'foo'], [...'food'], [...'focus']]);
    assert.isEmpty(trie.words([...'cat']));
  });

  it('clears words', () => {
    trie.add([...'foo']);
    assert.isTrue(trie.has([...'foo']));

    trie.clear();
    assert.isFalse(trie.has([...'foo']));
    assert.isEmpty(trie.words([...'foo']));
  });

  it('provides the longest prefix', () => {
    trie.add([...'super']);
    trie.add([...'supercar']);

    // Longest non-word prefix match.
    assert.deepEqual(trie.longestPrefix([...'supercalifragilisticexpialidocious'], false), [...'superca']);

    // Longest word prefix match.
    assert.deepEqual(trie.longestPrefix([...'supercalifragilisticexpialidocious'], true), [...'super']);
  });
});