parse_call function

Extract Data Information From Arguments Passed to Functions (internal)

Using sys.calls(), sys.frames() and match.call(), this utility function extracts and/or infers information about the data being processed. Data frame name, variable names and labels if any, subsetting information, grouping information (when by() is used) are returned by the function which tries various methods to get this information.

parse_call(
  mc,
  var = "x",
  df_name = TRUE,
  df_label = TRUE,
  var_name = TRUE,
  var_label = TRUE,
  caller = "",
  silent = TRUE
)

Arguments

• var: Character. x (default) or y (the latter being used only in ctable).
• df_name: Logical.
• df_label: Logical.
• var_name: Logical.
• var_label: Logical.
• silent: Logical. Hide console messages. TRUE by default.

Returns

A list consisting of one or many of the following items

• df_name The data frame name
• df_label The data frame label
• var_name The variable name(s)
• var_label The variable label
• by_var The variable used in by(), when in the call stack
• by_group The group, when by() was used
• by_first Binary indicator used when by() is in the call stack
• by_last Binary indicator

Author(s)

Dominic Comtois, dominic.comtois@gmail.com