private void GetLineComment(string lexeme)
{
while (CurrentSymbol.CurrentSymbol != '\n')
{
lexeme += CurrentSymbol.CurrentSymbol;
CurrentSymbol = SourceCode.GetNextSymbol();
}
CurrentSymbol = SourceCode.GetNextSymbol();
}
private Token GetLiteralNumber(string lexeme, int tokenColumn, int tokenRow)
{
CurrentSymbol = SourceCode.GetNextSymbol();
//case score=(float)countr/countq*100-difftime(finaltime,initialtime)/3;
// if (lexeme.Contains("e") || lexeme.Contains("E"))
while (char.IsLetterOrDigit(CurrentSymbol.CurrentSymbol) || CurrentSymbol.CurrentSymbol == '.' ||
CurrentSymbol.CurrentSymbol == 'e' || CurrentSymbol.CurrentSymbol == 'E' || CurrentSymbol.CurrentSymbol == '-')
{
if (!lexeme.Contains("e") && !lexeme.Contains("E") && CurrentSymbol.CurrentSymbol == '-')
{
break;
}
lexeme += CurrentSymbol.CurrentSymbol;
CurrentSymbol = SourceCode.GetNextSymbol();
}
if (Regex.IsMatch(lexeme, @"^[0-9]*(?:\.[0-9]*)?$"))
{
if (lexeme.Contains("."))
{
return(new Token
{
TokenType = TokenType.LiteralDecimal,
Lexeme = lexeme,
Column = tokenColumn,
Row = tokenRow
});
}
return(new Token
{
TokenType = TokenType.LiteralNumber,
Lexeme = lexeme,
Column = tokenColumn,
Row = tokenRow
});
}
//Floating point numbers
if (Regex.IsMatch(lexeme, @"^[-]?(0|[1-9][0-9]*)(\.[0-9]+)?([eE][+-]?[0-9]+)?$"))
{
return(new Token
{
TokenType = TokenType.LiteralFloat,
Lexeme = lexeme,
Column = tokenColumn,
Row = tokenRow
});
}
throw new LexicalException($"Symbol {CurrentSymbol.CurrentSymbol} not recognized at Row:{CurrentSymbol.Row} Col: {CurrentSymbol.Column}");
}
private Token GetSeparator(string lexeme, int tokenColumn, int tokenRow)
{
CurrentSymbol = SourceCode.GetNextSymbol();
return(new Token
{
TokenType = ReservedWords._separators[lexeme],
Lexeme = lexeme,
Column = tokenColumn,
Row = tokenRow
});
}
private string ConsumeQuotationMark()
{
string lex = string.Empty;
CurrentSymbol = SourceCode.GetNextSymbol();
if (CurrentSymbol.CurrentSymbol == '"')
{
lex += CurrentSymbol.CurrentSymbol;
CurrentSymbol = SourceCode.GetNextSymbol();
}
else
{
if (CurrentSymbol.CurrentSymbol == '\\')
{
CurrentSymbol = SourceCode.GetNextSymbol();
lex += CurrentSymbol.CurrentSymbol;
CurrentSymbol = SourceCode.GetNextSymbol();
}
}
return(lex);
}
private string GetBlockComment(string lexeme)
{
while (CurrentSymbol.CurrentSymbol != '*')
{
lexeme += CurrentSymbol.CurrentSymbol;
CurrentSymbol = SourceCode.GetNextSymbol();
}
//Adding the * to the lexeme string
lexeme += CurrentSymbol.CurrentSymbol;
//Get the char right after the *, to check if it's a / so we can close the comment
CurrentSymbol = SourceCode.GetNextSymbol();
if (CurrentSymbol.CurrentSymbol == '/')
{
lexeme += CurrentSymbol.CurrentSymbol;
CurrentSymbol = SourceCode.GetNextSymbol();
return(lexeme);
}
return(GetBlockComment(lexeme));
}
private Token GetLiteralHexadecimal(string lexeme, int tokenColumn, int tokenRow)
{
CurrentSymbol = SourceCode.GetNextSymbol();
//Hexadecimal literal
while (char.IsLetterOrDigit(CurrentSymbol.CurrentSymbol))
{
lexeme += CurrentSymbol.CurrentSymbol;
CurrentSymbol = SourceCode.GetNextSymbol();
}
if (Regex.IsMatch(lexeme, @"\A\b(0[xX])?[0-9a-fA-F]+\b\Z"))
{
return(new Token
{
TokenType = TokenType.LiteralHexadecimal,
Lexeme = lexeme,
Column = tokenColumn,
Row = tokenRow
});
}
throw new LexicalException($"Symbol {CurrentSymbol.CurrentSymbol} not recognized at Row:{CurrentSymbol.Row} Col: {CurrentSymbol.Column}");
}
private Token GetOperator(string lexeme, int tokenColumn, int tokenRow)
{
CurrentSymbol = SourceCode.GetNextSymbol();
if (ReservedWords._specialSymbols.Contains(CurrentSymbol.CurrentSymbol.ToString()) &&
!(lexeme.Equals(">") && CurrentSymbol.CurrentSymbol == '/') &&
!(lexeme.Equals("*") && CurrentSymbol.CurrentSymbol == '*'))
{
lexeme += CurrentSymbol.CurrentSymbol;
CurrentSymbol = SourceCode.GetNextSymbol();
if (lexeme == "%>")
{
// CMode = false;
HtmlMode = true;
CurrentSymbol = SourceCode.GetNextSymbol();
//return GetNextToken();
return(new Token
{
TokenType = ReservedWords._operators[lexeme.Substring(0, 2)],
Lexeme = lexeme,
Column = tokenColumn,
Row = tokenRow
});
}
//Special case for comments, we've got to get the line(S) of the comments
if (lexeme == "//")
{
string str = string.Empty;
GetLineComment(str);
return(GetNextToken());
}
//For block comments
if (lexeme == "/*")
{
string str = string.Empty;
GetBlockComment(str);
return(GetNextToken());
}
//special operators like >>= and <<=
if (ReservedWords._specialSymbols.Contains(lexeme.Substring(0, 2)))
{
if (CurrentSymbol.CurrentSymbol == '=')
{
lexeme += CurrentSymbol.CurrentSymbol;
if (lexeme == ">>=" || lexeme == "<<=")
{
CurrentSymbol = SourceCode.GetNextSymbol();
}
return(new Token
{
TokenType = ReservedWords._operators[lexeme.Substring(0, 3)],
Lexeme = lexeme,
Column = tokenColumn,
Row = tokenRow
});
}
}
return(new Token
{
TokenType = ReservedWords._operators[lexeme.Substring(0, 2)],
Lexeme = lexeme,
Column = tokenColumn,
Row = tokenRow
});
}
return(new Token
{
TokenType = ReservedWords._operators[lexeme],
Lexeme = lexeme,
Column = tokenColumn,
Row = tokenRow
});
}
public Token GetNextToken()
{
var lexeme = string.Empty;
var tokenRow = 0;
var tokenColumn = 0;
if (HtmlMode)
{
do
{
if (CurrentSymbol.CurrentSymbol == '<')
{
lexeme += CurrentSymbol.CurrentSymbol;
tokenColumn = CurrentSymbol.Column;
tokenRow = CurrentSymbol.Row;
CurrentSymbol = SourceCode.GetNextSymbol();
if (CurrentSymbol.CurrentSymbol == '%')
{
lexeme += CurrentSymbol.CurrentSymbol;
tokenColumn = CurrentSymbol.Column;
tokenRow = CurrentSymbol.Row;
// CMode = true;
HtmlMode = false;
CurrentSymbol = SourceCode.GetNextSymbol();
}
}
else
{
lexeme += CurrentSymbol.CurrentSymbol;
tokenColumn = CurrentSymbol.Column;
tokenRow = CurrentSymbol.Row;
CurrentSymbol = SourceCode.GetNextSymbol();
if (CurrentSymbol.CurrentSymbol == '\0')
{
HtmlMode = false;
}
}
}while(HtmlMode);
return(new Token
{
TokenType = TokenType.HTMLContent,
Lexeme = lexeme,
Row = tokenRow,
Column = tokenColumn
});
// return GetNextToken();
}
while (char.IsWhiteSpace(CurrentSymbol.CurrentSymbol))
{
CurrentSymbol = SourceCode.GetNextSymbol();
}
if (CurrentSymbol.CurrentSymbol == '\0')
{
return(new Token
{
TokenType = TokenType.EndOfFile,
Row = tokenRow,
Column = tokenColumn
});
}
if (char.IsLetter(CurrentSymbol.CurrentSymbol) || CurrentSymbol.CurrentSymbol == '_')
{
lexeme += CurrentSymbol.CurrentSymbol;
tokenColumn = CurrentSymbol.Column;
tokenRow = CurrentSymbol.Row;
return(GetIdentifier(lexeme, tokenColumn, tokenRow));
}
//For octal and hexadecimal literals
if (char.IsDigit(CurrentSymbol.CurrentSymbol) && (CurrentSymbol.CurrentSymbol) == '0')
{
lexeme += CurrentSymbol.CurrentSymbol;
tokenColumn = CurrentSymbol.Column;
tokenRow = CurrentSymbol.Row;
CurrentSymbol = SourceCode.GetNextSymbol();
if (CurrentSymbol.CurrentSymbol == 'x')
{
lexeme += CurrentSymbol.CurrentSymbol;
return(GetLiteralHexadecimal(lexeme, tokenColumn, tokenRow));
}
if (!char.IsDigit(CurrentSymbol.CurrentSymbol))
{
//this applies for a single zero
if (lexeme.Length == 1 && lexeme == "0")
{
return(new Token
{
TokenType = TokenType.LiteralNumber,
Lexeme = lexeme,
Column = tokenColumn,
Row = tokenRow
});
}
}
lexeme += CurrentSymbol.CurrentSymbol;
return(GetLiteralOctal(lexeme, tokenColumn, tokenRow));
}
if (char.IsDigit(CurrentSymbol.CurrentSymbol))
{
lexeme += CurrentSymbol.CurrentSymbol;
tokenColumn = CurrentSymbol.Column;
tokenRow = CurrentSymbol.Row;
return(GetLiteralNumber(lexeme, tokenColumn, tokenRow));
}
if (ReservedWords._separators.ContainsKey(CurrentSymbol.CurrentSymbol.ToString()))
{
lexeme += CurrentSymbol.CurrentSymbol;
tokenColumn = CurrentSymbol.Column;
tokenRow = CurrentSymbol.Row;
return(GetSeparator(lexeme, tokenColumn, tokenRow));
}
if (ReservedWords._operators.ContainsKey(CurrentSymbol.CurrentSymbol.ToString()))
{
lexeme += CurrentSymbol.CurrentSymbol;
tokenColumn = CurrentSymbol.Column;
tokenRow = CurrentSymbol.Row;
return(GetOperator(lexeme, tokenColumn, tokenRow));
}
//Get Literals char
if (CurrentSymbol.CurrentSymbol == '\'')
{
tokenColumn = CurrentSymbol.Column;
tokenRow = CurrentSymbol.Row;
//lexeme += _currentSymbol.CurrentSymbol;
CurrentSymbol = SourceCode.GetNextSymbol();
if (CurrentSymbol.CurrentSymbol == '\\')
{
lexeme += CurrentSymbol.CurrentSymbol;
CurrentSymbol = SourceCode.GetNextSymbol();
lexeme += CurrentSymbol.CurrentSymbol;
CurrentSymbol = SourceCode.GetNextSymbol();
}
lexeme = GetLiteralStringOrChar(lexeme, '\'');
if (lexeme.Length == 1 || lexeme.StartsWith('\\'.ToString()))
{
return(new Token
{
TokenType = TokenType.LiteralChar,
Lexeme = lexeme,
Column = tokenColumn,
Row = tokenRow
});
}
}
//Literals string
if (CurrentSymbol.CurrentSymbol == '"')
{
tokenColumn = CurrentSymbol.Column;
tokenRow = CurrentSymbol.Row;
CurrentSymbol = SourceCode.GetNextSymbol();
lexeme = GetLiteralStringOrChar(lexeme, '"');
//Check if the string has escape characters, this is for special strings with a \
/*like : cout << "Line 4 - a is either less than \
* or euqal to b" << endl ;*/
//for a multiline string to be accepted, I split the lexeme into separate lines, it's required
//for each line except the last to have the character \, if not, it's not a valid multiline string
string[] lines = lexeme.Split(new[] { "\r\n", "\n" }, StringSplitOptions.None);
for (int i = 0; i < lines.Length - 1; i++)
{
if (!lines[i].Contains("\\"))
{
throw new LexicalException($"Symbol {CurrentSymbol.CurrentSymbol} not recognized at Row:{CurrentSymbol.Row} Col: {CurrentSymbol.Column}");
}
}
return(new Token
{
TokenType = TokenType.LiteralString,
Lexeme = lexeme,
Column = tokenColumn,
Row = tokenRow
});
}
//This one is used for #include and for date format #dd-MM-yyyy#
if (CurrentSymbol.CurrentSymbol == '#')
{
lexeme += CurrentSymbol.CurrentSymbol;
CurrentSymbol = SourceCode.GetNextSymbol();
//Fisrt option applies for #include, its a reserved word
if (char.IsLetter(CurrentSymbol.CurrentSymbol))
{
lexeme += CurrentSymbol.CurrentSymbol;
tokenColumn = CurrentSymbol.Column;
tokenRow = CurrentSymbol.Row;
return(GetIdentifier(lexeme, tokenColumn, tokenRow));
}
//For dates
if (char.IsDigit(CurrentSymbol.CurrentSymbol))
{
tokenColumn = CurrentSymbol.Column;
tokenRow = CurrentSymbol.Row;
lexeme = string.Empty;
lexeme = GetLiteralStringOrChar(lexeme, '#');
}
DateTime dt;
bool isValid = DateTime.TryParseExact(lexeme.Replace('#', ' '), "dd-MM-yyyy", CultureInfo.InvariantCulture,
DateTimeStyles.None,
out dt);
if (isValid)
{
return(new Token
{
TokenType = TokenType.LiteralDate,
Lexeme = lexeme,
Column = tokenColumn,
Row = tokenRow
});
}
}
throw new LexicalException($"Symbol {CurrentSymbol.CurrentSymbol} not recognized at Row:{CurrentSymbol.Row} Col: {CurrentSymbol.Column}");
}
