private Expr Multiplication()
{
Expr expr = Unary();
while (Match(TokenType.SLASH, TokenType.STAR))
{
Token op = Previous();
Expr right = Unary();
expr = new Expr.Binary(expr, op, right);
}
return(expr);
}
private Expr Addition()
{
Expr expr = Multiplication();
while (Match(TokenType.MINUS, TokenType.PLUS))
{
Token op = Previous();
Expr right = Multiplication();
expr = new Expr.Binary(expr, op, right);
}
return(expr);
}
private Expr Comp()
{
Expr expr = Addition();
while (Match(TokenType.GREATER, TokenType.GREATER_EQUAL, TokenType.LESS, TokenType.LESS_EQUAL))
{
Token op = Previous();
Expr right = Addition();
expr = new Expr.Binary(expr, op, right);
}
return(expr);
}
private Expr Equality()
{
// The default returned value if while loop never executes is just the result of comp()
Expr expr = Comp();
while (Match(TokenType.BANG_EQUAL, TokenType.EQUAL_EQUAL))
{
Token op = Previous();
Expr right = Comp();
expr = new Expr.Binary(expr, op, right);
}
return(expr);
}
public string VisitBinaryExpr(Expr.Binary expr)
{
return(Parenthesize(expr.op.lexeme, expr.left, expr.right));
}
public MyVoid VisitBinaryExpr(Expr.Binary expr)
{
resolve(expr.left);
resolve(expr.right);
return(null);
}