private Expr multiplication()
{
Expr expr = unary();
while (match(TokenType.SLASH, TokenType.STAR))
{
Token operator_ = previous();
Expr right = unary();
expr = new Expr.Binary(expr, operator_, right);
}
return(expr);
}
private Expr addition()
{
Expr expr = multiplication();
while (match(TokenType.MINUS, TokenType.PLUS))
{
Token operator_ = previous();
Expr right = multiplication();
expr = new Expr.Binary(expr, operator_, right);
}
return(expr);
}
private Expr comparison()
{
Expr expr = addition();
while (match(TokenType.GREATER, TokenType.GREATER_EQUAL, TokenType.LESS, TokenType.LESS_EQUAL))
{
Token operator_ = previous();
Expr right = addition();
expr = new Expr.Binary(expr, operator_, right);
}
return(expr);
}
private Expr equality()
{
Expr expr = comparison();
while (match(TokenType.BANG_EQUAL, TokenType.EQUAL_EQUAL))
{
Token operator_ = previous();
Expr right = comparison();
expr = new Expr.Binary(expr, operator_, right);
}
return(expr);
}
public string visitBinaryExpr(Expr.Binary expr)
{
return(parenthesize(expr.operator_.lexeme, expr.left, expr.right));
}
public object visitBinaryExpr(Expr.Binary expr)
{
resolve(expr.left);
resolve(expr.right);
return(null);
}