protected override Token <String> Match(TokenizableDataStream <String> data, ref SourcePosition streamPos, MessageLog log)
{
SourcePosition start = new SourcePosition(streamPos);
bool whiteSpace = false;
int newlines = 0;
int column = streamPos.Column;
while (!data.AtEnd() && String.IsNullOrWhiteSpace(data.CurrentItem))
{
whiteSpace = true;
if (data.CurrentItem == "\n")
{
newlines++;
column = 0;
}
else
{
column++;
}
data.Advance();
}
if (whiteSpace)
{
streamPos = new SourcePosition(start.Line + newlines, column, data.CurrentIndex);
SourcePosition end = new SourcePosition(streamPos);
return(new Token <String>(TokenType.WhiteSpace, null, start, end));
}
return(null);
}
protected override Token <string> Match(TokenizableDataStream <string> data, ref SourcePosition streamPos, MessageLog log)
{
SourcePosition start = new SourcePosition(streamPos);
string comment = null;
if (data.CurrentItem == "/")
{
data.Advance();
if (data.CurrentItem == "/")
{
data.Advance();
while (!data.AtEnd())
{
if (data.CurrentItem == "\n")
{
break;
}
comment += data.CurrentItem;
data.Advance();
}
comment ??= "";
streamPos = streamPos.GetModifiedPosition(0, data.CurrentIndex - start.CharIndex, data.CurrentIndex - start.CharIndex);
SourcePosition end = new SourcePosition(streamPos);
return(new Token <string>(TokenType.SingleLineComment, comment, start, end));
}
}
return(null);
}
protected override Token <string> Match(TokenizableDataStream <string> data, ref SourcePosition streamPos, MessageLog log)
{
SourcePosition start = new SourcePosition(streamPos);
string value = null;
if (data.CurrentItem == Delimiter)
{
data.Advance();
bool inEscape = false;
for (; !data.AtEnd(); data.Advance())
{
if (inEscape)
{
inEscape = false;
switch (data.CurrentItem)
{
case "\\":
case Delimiter:
value += data.CurrentItem;
continue;
default:
log.LogError(@$ "Unrecognized escape sequence: '\{data.CurrentItem}'", new SourcePosition(streamPos));
return(null);
}
}
if (data.CurrentItem == "\\")
{
inEscape = true;
continue;
}
if (data.CurrentItem == Delimiter)
{
break;
}
if (data.CurrentItem == "\n")
{
streamPos = streamPos.GetModifiedPosition(0, data.CurrentIndex - start.CharIndex, data.CurrentIndex - start.CharIndex);
log.LogError("Name Literals can not contain line breaks!", start, new SourcePosition(streamPos));
return(null);
}
value += data.CurrentItem;
}
if (data.CurrentItem == Delimiter)
{
data.Advance();
value ??= "None"; //empty name literals should be interpreted as 'None'
}
else
{
streamPos = streamPos.GetModifiedPosition(0, data.CurrentIndex - start.CharIndex, data.CurrentIndex - start.CharIndex);
log.LogError("Name Literal was not terminated properly!", start, new SourcePosition(streamPos));
return(null);
}
}
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 value = null;
if (data.CurrentItem == "\"")
{
data.Advance();
String prev = "";
while (!data.AtEnd())
{
if (data.CurrentItem == "\"" && prev != "\\")
{
break;
}
else if (data.CurrentItem == "\n")
{
streamPos = streamPos.GetModifiedPosition(0, data.CurrentIndex - start.CharIndex, data.CurrentIndex - start.CharIndex);
log.LogError("String Literals can not contain line breaks!", start, new SourcePosition(streamPos));
return(null);
}
value += data.CurrentItem;
prev = data.CurrentItem;
data.Advance();
}
if (data.CurrentItem == "\"")
{
data.Advance();
if (value == null)
{
value = "";
}
}
else
{
streamPos = streamPos.GetModifiedPosition(0, data.CurrentIndex - start.CharIndex, data.CurrentIndex - start.CharIndex);
log.LogError("String Literal was not terminated properly!", start, new SourcePosition(streamPos));
return(null);
}
}
if (value != null)
{
streamPos = streamPos.GetModifiedPosition(0, data.CurrentIndex - start.CharIndex, data.CurrentIndex - start.CharIndex);
SourcePosition end = new SourcePosition(streamPos);
return(new Token <String>(TokenType.String, value, start, end));
}
return(null);
}
private static string SubNumber(TokenizableDataStream <string> data, Regex regex)
{
string number = null;
string peek = data.CurrentItem;
while (!data.AtEnd() && regex.IsMatch(peek))
{
number += peek;
data.Advance();
peek = data.CurrentItem;
}
return(number);
}
protected override Token <string> Match(TokenizableDataStream <string> data, ref SourcePosition streamPos, MessageLog log)
{
SourcePosition start = new SourcePosition(streamPos);
string peek = data.CurrentItem;
if (peek != "$")
{
return(null);
}
data.Advance();
peek = data.CurrentItem;
bool isNegative = false;
if (peek == "-")
{
isNegative = true;
data.Advance();
peek = data.CurrentItem;
}
string number = null;
var regex = new Regex("[0-9]");
while (!data.AtEnd() && regex.IsMatch(peek))
{
number += peek;
data.Advance();
peek = data.CurrentItem;
}
if (number == null)
{
return(null);
}
if (isNegative)
{
number = $"-{number}";
}
streamPos = streamPos.GetModifiedPosition(0, data.CurrentIndex - start.CharIndex, data.CurrentIndex - start.CharIndex);
SourcePosition end = new SourcePosition(streamPos);
return(new Token <string>(TokenType.StringRefLiteral, number, start, end));
}
private String SubNumber(TokenizableDataStream <String> data, Regex regex)
{
String number = null;
String peek = data.CurrentItem;
while (!data.AtEnd() && regex.IsMatch(peek))
{
number += peek;
data.Advance();
peek = data.CurrentItem;
}
peek = data.CurrentItem;
bool hasDelimiter = String.IsNullOrWhiteSpace(peek) || Delimiters.Any(c => c.Keyword == peek) ||
peek == "x" || peek == ".";
return(number != null && hasDelimiter ? number : null);
}
protected override Token <string> Match(TokenizableDataStream <string> data, ref SourcePosition streamPos, MessageLog log)
{
SourcePosition start = new SourcePosition(streamPos);
String value = null;
Regex regex = new Regex("[0-9a-zA-Z_]");
if (data.CurrentItem == "'")
{
data.Advance();
while (!data.AtEnd() && regex.IsMatch(data.CurrentItem))
{
value += data.CurrentItem;
data.Advance();
}
if (data.CurrentItem == "'")
{
data.Advance();
if (value == null)
{
value = "";
}
}
else
{
streamPos = streamPos.GetModifiedPosition(0, data.CurrentIndex - start.CharIndex, data.CurrentIndex - start.CharIndex);
log.LogError("Name Literal was not terminated properly!", start, new SourcePosition(streamPos));
return(null);
}
}
if (value != null)
{
streamPos = streamPos.GetModifiedPosition(0, data.CurrentIndex - start.CharIndex, data.CurrentIndex - start.CharIndex);
SourcePosition end = new SourcePosition(streamPos);
return(new Token <String>(TokenType.Name, value, start, end));
}
return(null);
}
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;
while (!data.AtEnd() && !String.IsNullOrWhiteSpace(peek) &&
Delimiters.All(d => d.Keyword != peek) &&
peek != "\"" && peek != "'")
{
word += peek;
data.Advance();
peek = data.CurrentItem;
}
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);
}
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);
}