R: Alternate Parametrisation of 'match.call()'

match.call2 {rando}

R Documentation

Alternate Parametrisation of `match.call()`

Description

Alters the built-in function match.call() by providing an additional argument which means that by default a user can specify how far up the call stack they want to match a call of. See match.call() for more details.

Usage

match.call2(
  n = 0L,
  definition = sys.function(sys.parent(n + 1L)),
  call = sys.call(sys.parent(n + 1L)),
  expand.dots = TRUE,
  envir = parent.frame(n + 3L)
)

Arguments

`n`	How far up the call-stack they would like to extract. The default, `n=0` produces the same result as `match.call()` so this can be inserted wherever `match.call()` is used.
`definition`	a function, by default the function from which `match.call2()` is called.
`call`	an unevaluated call to the function specified by `definition`, as generated by `call`
`expand.dots`	logical. Should arguments matching `...` in the call be included or left as a `...` argument?
`envir`	an environment, from which the `...` in `call` are retrieved, if any.

Value

An object of class call

Examples

f <- function(n) {
  g(n)
}

g <- function(n) {
  h(n)
}

h <- function(n) {
  match.call2(n)
}

f(0)
f(1)
f(2)