public void TestStreamTokenizer()
{
String source = "123456789ABCDEF";
Func <List <String> > input = () => source.ToCharArray()
.Select(i => i.ToString(CultureInfo.InvariantCulture))
.ToList();
TokenizableDataStream <String> data = new TokenizableDataStream <String>(input);
// Take base snapshot for later match
data.PushSnapshot();
// Match CurrentItem result
Assert.AreEqual(data.CurrentItem, "1");
// Match advance
data.Advance(3);
Assert.AreEqual(data.CurrentItem, "4");
// Snapshot and advance and then pop and ensure result
data.PushSnapshot();
data.Advance();
data.PopSnapshot();
Assert.AreEqual(data.CurrentItem, "4");
// Snapshot, advance, discard snapshot and ensure result
data.PushSnapshot();
data.Advance(3);
data.DiscardSnapshot();
Assert.AreEqual(data.CurrentItem, "7");
// Pop snapshot and assert that we are once again at the start
data.PopSnapshot();
Assert.AreEqual(data.CurrentItem, "1");
// Test AtEnd for non-eof
Assert.IsFalse(data.AtEnd());
// Advance too far and ensure that AtEnd returns
data.PushSnapshot();
data.Advance(23);
Assert.IsTrue(data.AtEnd());
// Assert that currentItem is null when out of range
Assert.IsNull(data.CurrentItem);
// Pop back to start and assert that LookAhead returns desired item
data.PopSnapshot();
Assert.AreEqual(data.LookAhead(4), "5");
// Assert that LookAhead returns null once out of range
Assert.IsNull(data.LookAhead(42));
}
public void TestStreamTokenizer()
{
String source = "123456789ABCDEF";
Func<List<String>> input = () => source.ToCharArray()
.Select(i => i.ToString(CultureInfo.InvariantCulture))
.ToList();
TokenizableDataStream<String> data = new TokenizableDataStream<String>(input);
// Take base snapshot for later match
data.PushSnapshot();
// Match CurrentItem result
Assert.AreEqual(data.CurrentItem, "1");
// Match advance
data.Advance(3);
Assert.AreEqual(data.CurrentItem, "4");
// Snapshot and advance and then pop and ensure result
data.PushSnapshot();
data.Advance();
data.PopSnapshot();
Assert.AreEqual(data.CurrentItem, "4");
// Snapshot, advance, discard snapshot and ensure result
data.PushSnapshot();
data.Advance(3);
data.DiscardSnapshot();
Assert.AreEqual(data.CurrentItem, "7");
// Pop snapshot and assert that we are once again at the start
data.PopSnapshot();
Assert.AreEqual(data.CurrentItem, "1");
// Test AtEnd for non-eof
Assert.IsFalse(data.AtEnd());
// Advance too far and ensure that AtEnd returns
data.PushSnapshot();
data.Advance(23);
Assert.IsTrue(data.AtEnd());
// Assert that currentItem is null when out of range
Assert.IsNull(data.CurrentItem);
// Pop back to start and assert that LookAhead returns desired item
data.PopSnapshot();
Assert.AreEqual(data.LookAhead(4), "5");
// Assert that LookAhead returns null once out of range
Assert.IsNull(data.LookAhead(42));
}
protected override Token <string> Match(TokenizableDataStream <string> data, ref SourcePosition streamPos, MessageLog log)
{
SourcePosition start = new SourcePosition(streamPos);
string peek = data.CurrentItem;
string word = null;
loopStart:
while (!data.AtEnd() && !string.IsNullOrWhiteSpace(peek) &&
(Delimiters.All(d => d.Keyword != peek)) &&
peek != "\"" && peek != "'")
{
word += peek;
data.Advance();
peek = data.CurrentItem;
}
//HACK: there are variable names that include the c++ scope operator '::' for some godforsaken reason
if (peek == ":" && data.LookAhead(1) == ":")
{
word += peek;
data.Advance();
peek = data.CurrentItem;
word += peek;
data.Advance();
peek = data.CurrentItem;
goto loopStart;
}
if (word != null)
{
streamPos = streamPos.GetModifiedPosition(0, data.CurrentIndex - start.CharIndex, data.CurrentIndex - start.CharIndex);
SourcePosition end = new SourcePosition(streamPos);
return(new Token <string>(TokenType.Word, word, start, end));
}
return(null);
}
