Code is always written with "indentation" and other things that demonstrate that the 2d canvas distribution of the glyphs you're expressing actually does matter for the human element. You're almost writing ASCII art. The ( ) and [ ] are even in there to evoke other visual types.

It's ultimately 1D for the computer (a string); but so is an image (which according to you would encode 2D media) and any other media expressible in a countable number of bytes.