find_branch_num: Find the branch that leads from one node to another.

In autoharp: Semi-Automatic Grading of R and Rmd Scripts

Description

Given two nodes that are on the same path to the root, this function determines the branch that leads to the child node.

Usage

find_branch_num(th, child_id, ancestor_id)

Arguments

th	A TreeHarp object.
child_id	An integer node id. It corresponds to the node to trace up from.
ancestor_id	An integer node id. It corresponds to the node to trace down from.

Details

This is used when trying to find a sub-call from a TreeHarp object. It is useful in determining the indices to use when extracting the sub-call.

Value

An integer that denotes the branch to follow down (from the ancestor) to reach the child.

Examples

ex3 <- quote(x <- f(y = g(3, 4), z=1L))
t1 <- TreeHarp(ex3, TRUE)
find_branch_num(t1, 8, 3) # should be 1
find_branch_num(t1, 5, 3) # should be 2

autoharp documentation built on Nov. 13, 2021, 1:06 a.m.