Obtains an index that can be used to extract a sub-call from a language object.
Usage
get_recursive_index(th, node_id)
Arguments
- th
A TreeHarp object.
- node_id
An integer corresponding to a call within the parse tree
(not a literal, symbol or a formal argument).
Value
A vector of indices, that can be used (together with "[[") to obtain a
sub-call
Examples
ex3 <- quote(x <- f(y = g(3, 4), z=1L))
t1 <- TreeHarp(ex3, TRUE)
rec_index <- get_recursive_index(t1, 6)
ex3[[rec_index]]
#> g(3, 4)
ex3[[get_recursive_index(t1, 3)]]
#> f(y = g(3, 4), z = 1L)
