public void BasicEnumeratorTests()
{
CPStringTrie <string> .Enumerator e, e0;
CPStringTrie <string> emptyTrie = new CPStringTrie <string>();
Assert.IsNotNull(emptyTrie.FindAtLeast(""));
Assert.That(!emptyTrie.FindAtLeast("foo").IsValid);
Assert.IsNull(emptyTrie.FindExact(""));
Assert.That(!emptyTrie.Find("?", out e) && e != null && !e.IsValid);
CPStringTrie <string> trie = new CPStringTrie <string>();
foreach (string key in BasicTestStrings())
{
trie.Add(key, key);
}
Assert.That(trie.Find("An", out e));
Assert.That(!trie.Find("Am", out e0));
Assert.AreEqual(e0.CurrentKey, e.CurrentValue);
Assert.That(e.MovePrev());
Assert.AreEqual("A", e.CurrentKey);
Assert.AreEqual("A", e.CurrentValue);
Assert.AreEqual("An", e0.CurrentKey);
Assert.That(e0.MoveNext());
Assert.AreEqual("Ant", e0.CurrentKey);
Assert.That(!trie.Find("2Noté", out e));
Assert.AreEqual("2Noté thé Ŭnicodé.", e.CurrentKey);
Assert.IsNull(trie.FindExact("2Noté"));
Assert.IsNotNull(trie.FindExact("2An"));
Assert.AreEqual("16single", trie.FindAtLeast("16simgle").CurrentKey);
Assert.That(!trie.Find("32zzz", out e));
Assert.AreEqual("4", e.CurrentKey);
Assert.That(e.MoveNext());
Assert.AreEqual("4 ", e.CurrentKey);
Assert.That(e.MovePrev());
Assert.AreEqual("4", e.CurrentKey);
Assert.That(e.MovePrev());
Assert.AreEqual("32z", e.CurrentKey);
Assert.That(!trie.Find("zzz", out e));
Assert.That(!e.IsValid);
Assert.That(e.MovePrev());
Assert.AreEqual("z", e.CurrentValue);
TestFind(trie, 500);
}
private void TestFind(CPStringTrie <string> trie, int iterations)
{
Random rand = new Random();
CPStringTrie <string> .Enumerator e;
// Search for random character pairs and make sure the returned
// enumerator points to the right place.
for (int i = 0; i < iterations; i++)
{
char c0 = (char)rand.Next((int)' ', (int)'z' + 1);
char c1 = (char)rand.Next((int)' ', (int)'z' + 1);
string s = c0.ToString() + c1.ToString();
bool found = trie.Find(s, out e);
string curKey = e.IsValid ? e.CurrentKey : null;
bool havePrev = e.MovePrev();
if (found)
{
Assert.AreEqual(s, curKey);
}
else if (curKey != null)
{
Assert.That(string.CompareOrdinal(s, curKey) < 0);
}
else
{
Assert.That(havePrev);
}
Assert.That(havePrev == e.IsValid);
if (havePrev)
{
curKey = e.CurrentKey;
Assert.That(string.CompareOrdinal(s, curKey) > 0);
}
}
}