public static ASTParser Build(Lexer lexer)
{
var astParser = new ASTParser(lexer);
var numberDescription = new LiteralExpressionDescription(TokenType.Number, 0);
astParser.AddExpression(numberDescription);
astParser.AddExpression(new UnaryExpressionDescription(TokenType.Minus, 5));
astParser.AddExpression(new BinaryExpressionDescription(numberDescription, TokenType.Plus, numberDescription, 1));
astParser.AddExpression(new BinaryExpressionDescription(numberDescription, TokenType.Minus, numberDescription, 1));
astParser.AddExpression(new BinaryExpressionDescription(numberDescription, TokenType.Star, numberDescription, 2));
astParser.AddExpression(new BinaryExpressionDescription(numberDescription, TokenType.Slash, numberDescription, 2));
astParser.AddExpression(new BlockExpressionDescription(TokenType.OpenParenthesis, TokenType.CloseParenthesis, 4));
astParser.AddExpression(new LiteralExpressionDescription(TokenType.EOF, -1));
return(astParser);
}
private Expression ParseLiteralExpression(LiteralExpressionDescription led)
{
var token = _tokenList[_currentTokenIndex++];
return(led.TokenType == TokenType.EOF ? null : new LiteralExpression(token));
}
