private void ParseExpression()
{
var firstSetOfStatement5 = new[]
{
TokenKind.Plus, TokenKind.Minus, TokenKind.LeftParen, TokenKind.Identifier, TokenKind.NumberLiteral, TokenKind.StringLiteral
};
MatchOneOf(firstSetOfStatement5);
switch (_scanner.CurrentToken.TokenKind)
{
case TokenKind.Plus:
case TokenKind.Minus:
ParseSign();
ParseTerm();
_astBuilder.UnaryOpEnd(_scanner.CurrentToken);
var firstSetOfKleeneStar2 = new[]
{
TokenKind.Plus, TokenKind.Minus
};
while (firstSetOfKleeneStar2.Contains(_scanner.CurrentToken.TokenKind))
{
_astBuilder.BinaryOp(_scanner.CurrentToken);
ParseAddOperator();
ParseTerm();
_astBuilder.BinaryOpEnd(_scanner.CurrentToken);
}
break;
case TokenKind.LeftParen:
case TokenKind.Identifier:
case TokenKind.NumberLiteral:
case TokenKind.StringLiteral:
ParseTerm();
var firstSetOfKleeneStar3 = new[]
{
TokenKind.Plus, TokenKind.Minus
};
while (firstSetOfKleeneStar3.Contains(_scanner.CurrentToken.TokenKind))
{
_astBuilder.BinaryOp(_scanner.CurrentToken);
ParseAddOperator();
ParseTerm();
_astBuilder.BinaryOpEnd(_scanner.CurrentToken);
}
break;
}
}