public static Lexer Build()
{
var lexer = new Lexer();
lexer.AddTokenDefinition(new SingleCharTokenDescription(TokenType.EOF, '\0'));
lexer.AddTokenDefinition(new SingleCharTokenDescription(TokenType.Plus, '+'));
lexer.AddTokenDefinition(new SingleCharTokenDescription(TokenType.Minus, '-'));
lexer.AddTokenDefinition(new SingleCharTokenDescription(TokenType.Star, '*'));
lexer.AddTokenDefinition(new SingleCharTokenDescription(TokenType.Slash, '/'));
lexer.AddTokenDefinition(new SingleCharTokenDescription(TokenType.OpenParenthesis, '('));
lexer.AddTokenDefinition(new SingleCharTokenDescription(TokenType.CloseParenthesis, ')'));
lexer.AddTokenDefinition(new CharRangeTokenDescription(TokenType.Number, '0', '9'));
//lexer.AddTokenDefinition(new CharRangeSetTokenDescription(TokenType.Identifier, new char[] { 'A', 'Z', 'a', 'z' }));
lexer.AddTokenDefinition(new CharSetTokenDescription(TokenType.Blank, new char[] { (char)0x9, (char)0xa, (char)0xd, (char)0x20 }));
return(lexer);
}