/// <inheritdoc />
public ILexer <EndOfLine> Create()
{
var carriageReturnLexer = carriageReturnLexerFactory.Create();
var lineFeedLexer = lineFeedLexerFactory.Create();
var endOfLineSequenceLexer = concatenationLexerFactory.Create(carriageReturnLexer, lineFeedLexer);
return(new EndOfLineLexer(endOfLineSequenceLexer));
}
/// <inheritdoc />
public ILexer <WhiteSpace> Create()
{
var sp = spaceLexerFactory.Create();
var htab = horizontalTabLexerFactory.Create();
var innerLexer = alternativeLexerFactory.Create(sp, htab);
return(new WhiteSpaceLexer(innerLexer));
}
public ILexer <Integer> Create()
{
var signLexer = signLexerFactory.Create();
var optionalSignLexer = optionLexerFactory.Create(signLexer);
var digitLexer = digitLexerFactory.Create();
var manyDigitsLexer = repetitionLexerFactory.Create(digitLexer, 1, int.MaxValue);
var innerLexer = concatenationLexerFactory.Create(optionalSignLexer, manyDigitsLexer);
return(new IntegerLexer(innerLexer));
}
/// <inheritdoc />
public ILexer <LinearWhiteSpace> Create()
{
var endOfLineLexer = endOfLineLexerFactory.Create();
var whiteSpaceLexer = whiteSpaceLexerFactory.Create();
var foldLexer = concatenationLexerFactory.Create(endOfLineLexer, whiteSpaceLexer);
var breakingWhiteSpaceLexer = alternativeLexerFactory.Create(whiteSpaceLexer, foldLexer);
var innerLexer = repetitionLexerFactory.Create(breakingWhiteSpaceLexer, 0, int.MaxValue);
return(new LinearWhiteSpaceLexer(innerLexer));
}
public ICollection <int> Parse(string code)
{
// base initialize
ICollection <int> resTokens = new List <int>();
AntlrInputStream inputStream = new AntlrInputStream(code);
var cppLexer = _lexerFactory.Create(inputStream);
var tokens = cppLexer.GetAllTokens();
foreach (var token in tokens)
{
// trying to get type of the token
// keyword?
if (KeyWords.Contains(token.Text))
{
resTokens.Add(LexerConstants.KeyWordsStart + Array.IndexOf(KeyWords, token.Text));
}
// operator?
else if (Operators.Contains(token.Text))
{
resTokens.Add(LexerConstants.OpStart + Array.IndexOf(Operators, token.Text));
}
// string/char?
else if (token.Text.Last() == '\"' || token.Text.Last() == '\'')
{
resTokens.Add(LexerConstants.String);
}
else if (char.IsDigit(token.Text.First()))
{
// int?
if (token.Text.Contains('.'))
{
resTokens.Add(LexerConstants.Real);
}
// real?
else
{
resTokens.Add(LexerConstants.Number);
}
}
// id?
else if (char.IsLetter(token.Text.First()) || token.Text.First() == '_')
{
resTokens.Add(LexerConstants.Id);
}
// ?????
else
{
resTokens.Add(LexerConstants.Unknown);
}
}
return(resTokens);
}
/// <inheritdoc />
public ILexer <HexadecimalDigit> Create()
{
var hexadecimalDigitAlternativeLexer = alternativeLexerFactory.Create(
digitLexerFactory.Create(),
terminalLexerFactory.Create("A", StringComparer.OrdinalIgnoreCase),
terminalLexerFactory.Create("B", StringComparer.OrdinalIgnoreCase),
terminalLexerFactory.Create("C", StringComparer.OrdinalIgnoreCase),
terminalLexerFactory.Create("D", StringComparer.OrdinalIgnoreCase),
terminalLexerFactory.Create("E", StringComparer.OrdinalIgnoreCase),
terminalLexerFactory.Create("F", StringComparer.OrdinalIgnoreCase));
return(new HexadecimalDigitLexer(hexadecimalDigitAlternativeLexer));
}
