bquote_function: Adapt a function to use bquote on its arguments.

In wrapr: Wrap R Tools for Debugging and Parametric Programming

Adapt a function to use bquote on its arguments.

Description

bquote_function is for adapting a function defined elsewhere for bquote-enabled argument substitution. Re-write call to evaluate expr with bquote .() substitution. Uses convetion that := is considered a alias for =. Including .(-x) promoting x's value from character to a name, which is called "quote negation" (hence the minus-sign).

Usage

bquote_function(fn)

Arguments

fn	function to adapt, must have non-empty formals().

Value

new function.

See Also

bquote_call_args

Examples

if(requireNamespace('graphics', quietly = TRUE)) {
  angle = 1:10
  variable <- as.name("angle")
  plotb <- bquote_function(graphics::plot)
  plotb(x = .(variable), y = sin(.(variable)))
}



f1 <- function(x) { substitute(x) }
f2 <- bquote_function(f1)
arg <- "USER_ARG"
f2(arg)    # returns arg
f2(.(arg)) # returns "USER_ARG" (character)
f2(.(-arg)) # returns USER_ARG (name)

wrapr documentation built on Aug. 20, 2023, 1:08 a.m.