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LibVT: Ability to generate each of the 32 ASCII control characters

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Before, it was only possible to generate 27 control characters (from ^A
to ^Z, and ^\) (with only one possible key combination).

Now, the remaining 5 (^@, ^[, ^], ^^, and ^_) can also be generated with
control plus key combinations. :^)

Also added are the legacy aliases supported by most terminals:

    Ctrl+{2, Space} -> ^@ (NUL)
    Ctrl+3 -> ^[ (ESC)
    Ctrl+4 -> ^\
    Ctrl+5 -> ^]
    Ctrl+6 -> ^^
    Ctrl+7 -> ^_
    Ctrl+8 -> ^? (DEL)
    Ctrl+/ -> ^_

Note that now, one extra key combination corresponding to a character
that shares the same least significant five bits with the original
character (used in caret notation) can also generate a control
character. For example, in the US English keyboard layout both Ctrl+[
and Ctrl+{ (same as Ctrl+Shift+[) will generate the Escape control
character (^[).
This commit is contained in:
ronak69 2024-02-01 10:45:02 +00:00 • committed by Ali Mohammad Pur
parent cb02d52ac9
commit ff33f00d16
1 changed files with 19 additions and 5 deletions
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24
Userland/Libraries/LibVT/Terminal.cpp
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@ -1533,11 +1533,25 @@ void Terminal::handle_key_press(KeyCode key, u32 code_point, u8 flags)
// Key event was not one of the above special cases,
// attempt to treat it as a character...
if (ctrl) {
if (code_point >= 'a' && code_point <= 'z') {
code_point = code_point - 'a' + 1;
} else if (code_point == '\\') {
code_point = 0x1c;
}
constexpr auto ESC = '\033';
constexpr auto NUL = 0;
constexpr auto DEL = 0x7f;
if (code_point >= '@' && code_point < DEL)
code_point &= 0x1f;
// Legacy aliases
else if (code_point == '2' || code_point == ' ')
// Ctrl+{2, Space, @, `} -> ^@ (NUL)
code_point = NUL;
else if (code_point >= '3' && code_point <= '7')
// Ctrl+3 -> ^[ (ESC), Ctrl+4 -> ^\, Ctrl+5 -> ^], Ctrl+6 -> ^^, Ctrl+7 -> ^_
code_point = ESC + (code_point - '3');
else if (code_point == '8')
// Ctrl+8 -> ^? (DEL)
code_point = DEL;
else if (code_point == '/')
// Ctrl+/ -> ^_
code_point = '_' & 0x1f;
}
// Alt modifier sends escape prefix.