snarkyterm: Development Log
Started working on CSI sequence parser, it's fun to do all this works from scratch, there are too many cases with almost zero documentation/specs, lol.
According to Wikipedia, I think a CSI sequence can be parsed into a tuple of
(param, intermediate, final) bytes like the
ESC [ <0x30-0x3F>+ <0x20-0x2F>+ <0x40-0x7E> ↓ ↓ ↓ param intermediate final
For example, with a sequence like
ESC[5A to move cursor up 5 lines, it would be parsed as
(5, _, A). Longer and more
complex commands like settting foreground color
ESC[38;5;94m would be parsed as
(38;5;94, _, m).
At first, I think I would use
nom to write a parser, but I just feel lazy, so I wrote something similar to the idea of
nom for parsing, luckily, the structure of the CSI sequence is not complex enough, so a simple
iter chain would be enough
to handle it.
With the parser ready, the first CSI sequence to be implemented is
ESC[2J, what you got after sending
clear command :D