RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 10:57:34 +00:00
Code Issues Activity Actions

LibVT: Implement new ANSI escape sequence parser

Browse source 
This commit replaces the former, hand-written parser with a new one that
can be generated automatically according to a state change diagram.

The new `EscapeSequenceParser` class provides a more ergonomic interface
to dealing with escape sequences. This interface has been inspired by
Alacritty's [vte library](https://github.com/alacritty/vte/).

I tried to avoid changing the application logic inside the `Terminal`
class. While this code has not been thoroughly tested, I can't find
regressions in the basic command line utilities or `vttest`.

`Terminal` now displays nicer debug messages when it encounters an
unknown escape sequence. Defensive programming and bounds checks have
been added where we access parameters, and as a result, we can now
endure 4-5 seconds of `cat /dev/urandom`. :D

We generate EscapeSequenceStateMachine.h when building the in-kernel
LibVT, and we assume that the file is already in place when the userland
library is being built. This will probably cause problems later on, but
I can't find a way to do it nicely.
This commit is contained in:
Daniel Bertalan 2021-05-08 20:37:43 +02:00 • committed by Andreas Kling
parent 1b347298f1
commit be519022c3
11 changed files with 707 additions and 571 deletions
Download patch file Download diff file Expand all files Collapse all files

12
Meta/CMake/utils.cmake
View file

@ -154,3 +154,15 @@ function(embed_resource target section file)
)
target_sources("${target}" PRIVATE "${asm_file}")
endfunction()
function(generate_state_machine source header)
set(source ${CMAKE_CURRENT_SOURCE_DIR}/${source})
add_custom_command(
OUTPUT ${header}
COMMAND ${write_if_different} ${header} ${CMAKE_BINARY_DIR}/Userland/DevTools/StateMachineGenerator/StateMachineGenerator ${source} > ${header}
VERBATIM
DEPENDS StateMachineGenerator
MAIN_DEPENDENCY ${source}
)
get_filename_component(output_name ${header} NAME)
endfunction()