stack {rlang}

Get properties of the current or caller frame

Description

These accessors retrieve properties of frames on the call stack. The prefix indicates for which frame a property should be accessed:

• From the current frame with current_ accessors.

• From a calling frame with caller_ accessors.

• From a matching frame with frame_ accessors.

The suffix indicates which property to retrieve:

• ⁠_fn⁠ accessors return the function running in the frame.

• ⁠_call⁠ accessors return the defused call with which the function running in the frame was invoked.

• ⁠_env⁠ accessors return the execution environment of the function running in the frame.

Usage

current_call()

current_fn()

current_env()

caller_call(n = 1)

caller_fn(n = 1)

caller_env(n = 1)

frame_call(frame = caller_env())

frame_fn(frame = caller_env())

Arguments

n

The number of callers to go back.

frame

A frame environment of a currently running function, as returned by caller_env(). NULL is returned if the environment does not exist on the stack.

See Also

caller_env() and current_env()