Display a call (or expression) as a tree.

ast_ takes a quoted expression; ast does the quoting for you.

ast_(x, width = getOption("width"))

ast(x)

Arguments

x

Quoted call, list of calls, or expression to display.

width

Display width, defaults to current width as reported by getOption("width").

Examples

ast(f(x, 1, g(), h(i())))
#> ┗ ()
#>  ┗ `f
#>  ┗ `x
#>  ┗  1
#>  ┗ ()
#>   ┗ `g
#>  ┗ ()
#>   ┗ `h
#>   ┗ ()
#>    ┗ `i 
ast(if (TRUE) 3 else 4)
#> ┗ ()
#>  ┗ `if
#>  ┗  TRUE
#>  ┗  3
#>  ┗  4 
ast(function(a = 1, b = 2) {a + b + 10})
#> ┗ ()
#>  ┗ `function
#>  ┗ []
#>   ┗ a = 1
#>   ┗ b = 2
#>  ┗ ()
#>   ┗ `{
#>   ┗ ()
#>    ┗ `+
#>    ┗ ()
#>     ┗ `+
#>     ┗ `a
#>     ┗ `b
#>    ┗  10
#>  ┗ <NULL> 
ast(f(x)(y)(z))
#> ┗ ()
#>  ┗ ()
#>   ┗ ()
#>    ┗ `f
#>    ┗ `x
#>   ┗ `y
#>  ┗ `z 

ast_(quote(f(x, 1, g(), h(i()))))
#> ┗ ()
#>  ┗ `f
#>  ┗ `x
#>  ┗  1
#>  ┗ ()
#>   ┗ `g
#>  ┗ ()
#>   ┗ `h
#>   ┗ ()
#>    ┗ `i 
ast_(quote(if (TRUE) 3 else 4))
#> ┗ ()
#>  ┗ `if
#>  ┗  TRUE
#>  ┗  3
#>  ┗  4 
ast_(expression(1, 2, 3))
#> ┗  1
#> 
#> ┗  2
#> 
#> ┗  3