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LibLine: Parse CSI parameters and immediates

Browse Source 
No behavior change, but it makes it easy to handle
page up and page down if we wanted to make them do something
in libline.
This commit is contained in:
Nico Weber 2020-09-13 20:33:04 -04:00 committed by Andreas Kling
parent 365fa05a82
commit 2fe127d96f
Notes: sideshowbarker 2024-07-19 02:38:57 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/2fe127d96ff
Pull-request: https://github.com/SerenityOS/serenity/pull/3485
Reviewed-by: https://github.com/alimpfard
2 changed files with 52 additions and 22 deletions
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69
Libraries/LibLine/Editor.cpp
View File

@ -631,6 +631,11 @@ void Editor::handle_read_event()
Utf8View input_view { StringView { m_incomplete_data.data(), valid_bytes } };
size_t consumed_code_points = 0;
Vector<u8, 4> csi_parameter_bytes;
Vector<unsigned, 4> csi_parameters;
Vector<u8> csi_intermediate_bytes;
u8 csi_final;
for (auto code_point : input_view) {
if (m_finish)
break;
@ -644,7 +649,7 @@ void Editor::handle_read_event()
case InputState::GotEscape:
switch (code_point) {
case '[':
m_state = InputState::GotEscapeFollowedByLeftBracket;
m_state = InputState::CSIExpectParameter;
continue;
default: {
m_state = InputState::Free;
@ -658,29 +663,55 @@ void Editor::handle_read_event()
continue;
}
}
case InputState::GotEscapeFollowedByLeftBracket:
if (code_point == 'O') {
case InputState::CSIExpectParameter:
if (code_point >= 0x30 && code_point <= 0x3f) { // '0123456789:;<=>?'
csi_parameter_bytes.append(code_point);
continue;
}
m_state = InputState::CSIExpectIntermediate;
[[fallthrough]];
case InputState::CSIExpectIntermediate:
if (code_point >= 0x20 && code_point <= 0x2f) { // ' !"#$%&\'()*+,-./'
csi_intermediate_bytes.append(code_point);
continue;
}
m_state = InputState::CSIExpectFinal;
[[fallthrough]];
case InputState::CSIExpectFinal:
m_state = InputState::Free;
if (!(code_point >= 0x40 && code_point <= 0x7f)) {
dbgprintf("LibLine: Invalid CSI: %02x (%c)\r\n", code_point, code_point);
ctrl_held = false;
continue;
}
csi_final = code_point;
for (auto& parameter : String::copy(csi_parameter_bytes).split(';')) {
if (auto value = parameter.to_uint(); value.has_value())
csi_parameters.append(value.value());
else
csi_parameters.append(0);
}
if (csi_final == 'O') {
// mod_ctrl
ctrl_held = true;
continue;
}
if (code_point == 'Z') {
if (csi_final == 'Z') {
// 'reverse tab'
reverse_tab = true;
m_state = InputState::Free;
ctrl_held = false;
break;
}
cleanup_suggestions();
switch (code_point) {
switch (csi_final) {
case 'A': // ^[[A: arrow up
search_backwards();
m_state = InputState::Free;
ctrl_held = false;
continue;
case 'B': // ^[[B: arrow down
search_forwards();
m_state = InputState::Free;
ctrl_held = false;
continue;
case 'D': // ^[[D: arrow left
@ -688,7 +719,6 @@ void Editor::handle_read_event()
cursor_left_word();
else
cursor_left_character();
m_state = InputState::Free;
ctrl_held = false;
continue;
case 'C': // ^[[C: arrow right
@ -696,35 +726,34 @@ void Editor::handle_read_event()
cursor_right_word();
else
cursor_right_character();
m_state = InputState::Free;
ctrl_held = false;
continue;
case 'H': // ^[[H: home
go_home();
m_state = InputState::Free;
ctrl_held = false;
continue;
case 'F': // ^[[F: end
go_end();
m_state = InputState::Free;
ctrl_held = false;
continue;
case '3': // ^[[3~: delete
erase_character_forwards();
m_search_offset = 0;
m_state = InputState::ExpectTerminator;
case '~':
if (csi_parameters.size() == 1 && csi_parameters[0] == 3) { // ^[[3~: delete
erase_character_forwards();
m_search_offset = 0;
ctrl_held = false;
continue;
}
// ^[[5~: page up
// ^[[6~: page down
dbgprintf("LibLine: Unhandled '~'\r\n");
ctrl_held = false;
continue;
default:
dbgprintf("LibLine: Unhandled final: %02x (%c)\r\n", code_point, code_point);
m_state = InputState::Free;
ctrl_held = false;
continue;
}
break;
case InputState::ExpectTerminator:
m_state = InputState::Free;
continue;
case InputState::Free:
if (code_point == 27) {
m_state = InputState::GotEscape;

5
Libraries/LibLine/Editor.h
View File

@ -471,8 +471,9 @@ private:
enum class InputState {
Free,
GotEscape,
GotEscapeFollowedByLeftBracket,
ExpectTerminator,
CSIExpectParameter,
CSIExpectIntermediate,
CSIExpectFinal,
};
InputState m_state { InputState::Free };