debugging

In order to debug the command blocks of a mapping you can set the option debug = TRUE.

When the execution of a code block runs into an error, this then jumps into the code. We’ll sneak an error in this #IF command_block (In X2 you have to write a string containing a valid logical expression):

library(datadaptor)
free_commands <- tibble::tribble(
  ~X1, ~X2, ~X3, ~X4, ~X5, ~row,
  "#IF", "q1 ===#$%#!@ 18", "q2 = 2", "", "", 6
)
free_commands

When we construct our Mapping object:

m <- Mapping$new(
  tibble::tibble(q1 = 18),
  list(Free = free_commands),
  debug = TRUE
)

end then execute the modifications, the debugger stops at the browser().

m$modify_data()

and you will see the command prompt of the debugger:

Browse[1]>

There, you can move into the function that produces the error by continuing (pressing Shift + F5 in RStudio).