Reading binary trees from an archive in Ruby?

Question

ruby

Need help. There is an archive trees.zip with files like: barbra.tree, caryl.tree and so on. Inside each file is a serialized tree in JSON format in the form:
[1 ,,[3,[5,2]]]]
For example, one of the aline.tree files contains the following code inside:

[29,]],[24,]],[15,,[25,[42,2]]]]]]]],[18,,[19,,[26,[38,0]]]]]],[16,]],[22,,[31,[9,5]]]]]]]]]],[41,]]]],[41,]],[17,,[35,[42,18]]]]]]]],[35,,[49,,[34,[44,44]]]]]],[5,]],[40,,[12,[47,7]]]]]]]]]]]]

More classic wood look:

1
  /     \
  2      3
/  \    /  \
3   4   5   2

It is necessary to read some trees by name from the archive and display them in a format that is represented by the classic view. Tree names must be passed to the program using ENV variables.
Example:

$ NAME=small ruby trees.rb

     1
  /     \
  2      3
/  \    /  \
3   4   5   2

$ NAME=funny ruby trees.rb

Данное дерево не растет в данном лесу.

$ ruby trees.rb

Безымянных деревьев у нас не растет.

They must be read from the archive and, based on the data in the file, output a binary tree.
Please tell me how to do it?