Create a unary expression AST node

Represents a unary operator such as "-" or "not" applied to a single argument.

Usage

ast_unary(op, rhs)

Arguments

op

Character string. The unary operator, e.g., "-" or "not".

rhs

The operand (a ast object).

Value

An object of class ast and unary.

Examples

ast <- ast_unary("-", ast_symbol("x"))
str(ast)
#> List of 2
#>  $ op : chr "-"
#>  $ rhs:List of 1
#>   ..$ name: chr "x"
#>   ..- attr(*, "class")= chr [1:2] "symbol" "ast"
#>  - attr(*, "class")= chr [1:2] "unary" "ast"
ast_unary("not", ast_symbol("x"))
#> <AST unary>
#>   Operator: not
#>   Argument:
#> <AST symbol> x