The type of expression is determined by the number of subfolders in a folder? That seems like the brainfuck equivalent of this idea. I was thinking that you'd

The type of expression is determined by the number of subfolders in a folder? That seems like the brainfuck equivalent of this idea. I was thinking that you'd create a tree of folders to represent the abstract syntax tree of the program, with folder names being the actual syntactic elements/atoms of the program.