Validates that the provided function name is in the allowed list before
converting it to a function reference. Returns NULL for empty strings
or unrecognized names.
Usage
safe_resolve_adj_fxn(fn_name)
Arguments
- fn_name
Character string — name of the adjustment function.
Currently allowed values: "log2", "log", "log10", "neg_log10",
"log1p", "as.factor", "abs", "sqrt".
Value
The corresponding function, or NULL if fn_name is empty or
not in the allowed list.
Details
Use this instead of eval(str2expression()) when resolving function names
from user input (e.g., a dropdown that selects a transformation like
"log2" or "sqrt").
Examples
safe_resolve_adj_fxn("log2") # returns log2
#> function (x) .Primitive("log2")
safe_resolve_adj_fxn("") # NULL
#> NULL
safe_resolve_adj_fxn("system") # warning + NULL
#> Warning: Unrecognized adjustment function: system
#> NULL