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serenity/Userland/Libraries/LibVT/Terminal.cpp
Daniel Bertalan 4cf6963a1c LibVT: Add missing cursor movement escape sequences 
This commit adds support for the following ANSI escape sequences:
- `CNL` - Cursor Next Line
- `CPL` - Cursor Previous Line
- `VPR` - Line Position Relative
- `HPA` - Character Position Absolute
- `HPR` - Character Position Relative
2021-05-29 15:50:24 +02:00

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Daniel Bertalan <dani@danielbertalan.dev>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Terminal.h"
#include <AK/Debug.h>
#include <AK/StringBuilder.h>
#include <AK/StringView.h>
#include <LibVT/Terminal.h>
#ifdef KERNEL
# include <Kernel/TTY/VirtualConsole.h>
#endif
namespace VT {
#ifndef KERNEL
Terminal::Terminal(TerminalClient& client)
#else
Terminal::Terminal(Kernel::VirtualConsole& client)
#endif
: m_client(client)
, m_parser(*this)
{
}
#ifndef KERNEL
void Terminal::clear()
{
for (size_t i = 0; i < rows(); ++i)
active_buffer()[i].clear(m_current_state.attribute);
set_cursor(0, 0);
}
void Terminal::clear_including_history()
{
m_history.clear();
m_history_start = 0;
clear();
m_client.terminal_history_changed();
}
#endif
void Terminal::alter_mode(bool should_set, Parameters params, Intermediates intermediates)
{
auto steady_cursor_to_blinking = [](CursorStyle style) {
switch (style) {
case SteadyBar:
return BlinkingBar;
case SteadyBlock:
return BlinkingBlock;
case SteadyUnderline:
return BlinkingUnderline;
default:
return style;
}
};
auto blinking_cursor_to_steady = [](CursorStyle style) {
switch (style) {
case BlinkingBar:
return SteadyBar;
case BlinkingBlock:
return SteadyBlock;
case BlinkingUnderline:
return SteadyUnderline;
default:
return style;
}
};
if (intermediates.size() > 0 && intermediates[0] == '?') {
for (auto mode : params) {
switch (mode) {
case 3: {
// 80/132-column mode (DECCOLM)
unsigned new_columns = should_set ? 132 : 80;
dbgln_if(TERMINAL_DEBUG, "Setting {}-column mode", new_columns);
set_size(new_columns, rows());
clear();
break;
}
case 12:
if (should_set) {
// Start blinking cursor
m_cursor_style = steady_cursor_to_blinking(m_cursor_style);
} else {
// Stop blinking cursor
m_cursor_style = blinking_cursor_to_steady(m_cursor_style);
}
m_client.set_cursor_style(m_cursor_style);
break;
case 25:
if (should_set) {
// Show cursor
m_cursor_style = m_saved_cursor_style;
m_client.set_cursor_style(m_cursor_style);
} else {
// Hide cursor
m_saved_cursor_style = m_cursor_style;
m_cursor_style = None;
m_client.set_cursor_style(None);
}
break;
case 1047:
#ifndef KERNEL
if (should_set) {
dbgln_if(TERMINAL_DEBUG, "Switching to Alternate Screen Buffer");
m_use_alternate_screen_buffer = true;
clear();
} else {
dbgln_if(TERMINAL_DEBUG, "Switching to Normal Screen Buffer");
m_use_alternate_screen_buffer = false;
}
m_need_full_flush = true;
#else
dbgln("Alternate Screen Buffer is not supported");
#endif
break;
case 1048:
if (should_set)
SCOSC();
else
SCORC();
break;
case 1049:
#ifndef KERNEL
if (should_set) {
dbgln_if(TERMINAL_DEBUG, "Switching to Alternate Screen Buffer and saving state");
m_normal_saved_state = m_current_state;
m_use_alternate_screen_buffer = true;
clear();
} else {
dbgln_if(TERMINAL_DEBUG, "Switching to Normal Screen Buffer and restoring state");
m_current_state = m_normal_saved_state;
m_use_alternate_screen_buffer = false;
set_cursor(cursor_row(), cursor_column());
}
m_need_full_flush = true;
#else
dbgln("Alternate Screen Buffer is not supported");
#endif
break;
case 2004:
dbgln_if(TERMINAL_DEBUG, "Setting bracketed mode enabled={}", should_set);
m_needs_bracketed_paste = should_set;
break;
default:
dbgln("Terminal::alter_mode: Unimplemented private mode {} (should_set={})", mode, should_set);
break;
}
}
} else {
for (auto mode : params) {
switch (mode) {
// FIXME: implement *something* for this
default:
dbgln("Terminal::alter_mode: Unimplemented mode {} (should_set={})", mode, should_set);
break;
}
}
}
}
void Terminal::RM(Parameters params, Intermediates intermediates)
{
alter_mode(false, params, intermediates);
}
void Terminal::SM(Parameters params, Intermediates intermediates)
{
alter_mode(true, params, intermediates);
}
void Terminal::SGR(Parameters params)
{
if (params.is_empty()) {
m_current_state.attribute.reset();
return;
}
auto parse_color = [&]() -> Optional<u32> {
if (params.size() < 2) {
dbgln("Color code has no type");
return {};
}
u32 color = 0;
switch (params[1]) {
case 5: // 8-bit
if (params.size() < 3) {
dbgln("8-bit color code has too few parameters");
return {};
}
return xterm_colors[params[2]];
case 2: // 24-bit
if (params.size() < 5) {
dbgln("24-bit color code has too few parameters");
return {};
}
for (size_t i = 0; i < 3; ++i) {
color <<= 8;
color |= params[i + 2];
}
return color;
default:
dbgln("Unknown color type {}", params[1]);
return {};
}
};
if (params[0] == 38) {
m_current_state.attribute.foreground_color = parse_color().value_or(m_current_state.attribute.foreground_color);
} else if (params[0] == 48) {
m_current_state.attribute.background_color = parse_color().value_or(m_current_state.attribute.background_color);
} else {
// A single escape sequence may set multiple parameters.
for (auto param : params) {
switch (param) {
case 0:
// Reset
m_current_state.attribute.reset();
break;
case 1:
m_current_state.attribute.flags |= Attribute::Bold;
break;
case 3:
m_current_state.attribute.flags |= Attribute::Italic;
break;
case 4:
m_current_state.attribute.flags |= Attribute::Underline;
break;
case 5:
m_current_state.attribute.flags |= Attribute::Blink;
break;
case 7:
m_current_state.attribute.flags |= Attribute::Negative;
break;
case 22:
m_current_state.attribute.flags &= ~Attribute::Bold;
break;
case 23:
m_current_state.attribute.flags &= ~Attribute::Italic;
break;
case 24:
m_current_state.attribute.flags &= ~Attribute::Underline;
break;
case 25:
m_current_state.attribute.flags &= ~Attribute::Blink;
break;
case 27:
m_current_state.attribute.flags &= ~Attribute::Negative;
break;
case 30:
case 31:
case 32:
case 33:
case 34:
case 35:
case 36:
case 37:
// Foreground color
if (m_current_state.attribute.flags & Attribute::Bold)
param += 8;
m_current_state.attribute.foreground_color = xterm_colors[param - 30];
break;
case 39:
// reset foreground
m_current_state.attribute.foreground_color = Attribute::default_foreground_color;
break;
case 40:
case 41:
case 42:
case 43:
case 44:
case 45:
case 46:
case 47:
// Background color
if (m_current_state.attribute.flags & Attribute::Bold)
param += 8;
m_current_state.attribute.background_color = xterm_colors[param - 40];
break;
case 49:
// reset background
m_current_state.attribute.background_color = Attribute::default_background_color;
break;
default:
dbgln("FIXME: SGR: p: {}", param);
}
}
}
}
void Terminal::SCOSC()
{
dbgln_if(TERMINAL_DEBUG, "Save cursor position");
m_saved_cursor_position = m_current_state.cursor;
}
void Terminal::SCORC()
{
dbgln_if(TERMINAL_DEBUG, "Restore cursor position");
m_current_state.cursor = m_saved_cursor_position;
set_cursor(cursor_row(), cursor_column());
}
void Terminal::DECSC()
{
dbgln_if(TERMINAL_DEBUG, "Save cursor (and other state)");
if (m_use_alternate_screen_buffer) {
m_alternate_saved_state = m_current_state;
} else {
m_normal_saved_state = m_current_state;
}
}
void Terminal::DECRC()
{
dbgln_if(TERMINAL_DEBUG, "Restore cursor (and other state)");
if (m_use_alternate_screen_buffer) {
m_current_state = m_alternate_saved_state;
} else {
m_current_state = m_normal_saved_state;
}
set_cursor(cursor_row(), cursor_column());
}
void Terminal::XTERM_WM(Parameters params)
{
if (params.size() < 1)
return;
switch (params[0]) {
case 22: {
if (params.size() > 1 && params[1] == 1) {
dbgln("FIXME: we don't support icon titles");
return;
}
dbgln_if(TERMINAL_DEBUG, "Title stack push: {}", m_current_window_title);
[[maybe_unused]] auto rc = m_title_stack.try_append(move(m_current_window_title));
break;
}
case 23: {
if (params.size() > 1 && params[1] == 1)
return;
if (m_title_stack.is_empty()) {
dbgln("Shenanigans: Tried to pop from empty title stack");
return;
}
m_current_window_title = m_title_stack.take_last();
dbgln_if(TERMINAL_DEBUG, "Title stack pop: {}", m_current_window_title);
m_client.set_window_title(m_current_window_title);
break;
}
default:
dbgln("FIXME: XTERM_WM: Ps: {} (param count: {})", params[0], params.size());
}
}
void Terminal::DECSTBM(Parameters params)
{
unsigned top = 1;
unsigned bottom = m_rows;
if (params.size() >= 1 && params[0] != 0)
top = params[0];
if (params.size() >= 2 && params[1] != 0)
bottom = params[1];
if ((bottom - top) < 2 || bottom > m_rows) {
dbgln("Error: DECSTBM: scrolling region invalid: {}-{}", top, bottom);
return;
}
m_scroll_region_top = top - 1;
m_scroll_region_bottom = bottom - 1;
set_cursor(0, 0);
dbgln_if(TERMINAL_DEBUG, "Set scrolling region: {}-{}", m_scroll_region_top, m_scroll_region_bottom);
}
void Terminal::CUP(Parameters params)
{
// CUP – Cursor Position
unsigned row = 1;
unsigned col = 1;
if (params.size() >= 1 && params[0] != 0)
row = params[0];
if (params.size() >= 2 && params[1] != 0)
col = params[1];
set_cursor(row - 1, col - 1);
}
void Terminal::HVP(Parameters params)
{
unsigned row = 1;
unsigned col = 1;
if (params.size() >= 1 && params[0] != 0)
row = params[0];
if (params.size() >= 2 && params[1] != 0)
col = params[1];
set_cursor(row - 1, col - 1);
}
void Terminal::CUU(Parameters params)
{
unsigned num = 1;
if (params.size() >= 1 && params[0] != 0)
num = params[0];
int new_row = cursor_row() - num;
if (new_row < 0)
new_row = 0;
set_cursor(new_row, cursor_column());
}
void Terminal::CUD(Parameters params)
{
unsigned num = 1;
if (params.size() >= 1 && params[0] != 0)
num = params[0];
unsigned new_row = cursor_row() + num;
if (new_row >= m_rows)
new_row = m_rows - 1;
set_cursor(new_row, cursor_column());
}
void Terminal::CUF(Parameters params)
{
unsigned num = 1;
if (params.size() >= 1 && params[0] != 0)
num = params[0];
unsigned new_column = cursor_column() + num;
if (new_column >= m_columns)
new_column = m_columns - 1;
set_cursor(cursor_row(), new_column);
}
void Terminal::CUB(Parameters params)
{
unsigned num = 1;
if (params.size() >= 1 && params[0] != 0)
num = params[0];
int new_column = (int)cursor_column() - num;
if (new_column < 0)
new_column = 0;
set_cursor(cursor_row(), new_column);
}
void Terminal::CNL(Parameters params)
{
unsigned num = 1;
if (params.size() >= 1 && params[0] != 0)
num = params[0];
unsigned new_row = cursor_row() + num;
if (new_row >= m_columns)
new_row = m_columns - 1;
set_cursor(new_row, 0);
}
void Terminal::CPL(Parameters params)
{
unsigned num = 1;
if (params.size() >= 1 && params[0] != 0)
num = params[0];
int new_row = (int)cursor_row() - num;
if (new_row < 0)
new_row = 0;
set_cursor(new_row, 0);
}
void Terminal::CHA(Parameters params)
{
unsigned new_column = 1;
if (params.size() >= 1 && params[0] != 0)
new_column = params[0];
if (new_column > m_columns)
new_column = m_columns;
set_cursor(cursor_row(), new_column - 1);
}
void Terminal::REP(Parameters params)
{
unsigned count = 1;
if (params.size() >= 1 && params[0] != 0)
count = params[0];
for (unsigned i = 0; i < count; ++i)
put_character_at(m_current_state.cursor.row, m_current_state.cursor.column++, m_last_code_point);
}
void Terminal::VPA(Parameters params)
{
unsigned new_row = 1;
if (params.size() >= 1 && params[0] != 0)
new_row = params[0];
if (new_row > m_rows)
new_row = m_rows;
set_cursor(new_row - 1, cursor_column());
}
void Terminal::VPR(Parameters params)
{
unsigned num = 1;
if (params.size() >= 1 && params[0] != 0)
num = params[0];
int new_row = cursor_row() + num;
if (new_row >= m_rows)
new_row = m_rows - 1;
set_cursor(new_row, cursor_column());
}
void Terminal::HPA(Parameters params)
{
unsigned new_column = 1;
if (params.size() >= 1 && params[0] != 0)
new_column = params[0];
if (new_column > m_columns)
new_column = m_columns;
set_cursor(cursor_row(), new_column - 1);
}
void Terminal::HPR(Parameters params)
{
unsigned num = 1;
if (params.size() >= 1 && params[0] != 0)
num = params[0];
unsigned new_column = cursor_column() + num;
if (new_column >= m_columns)
new_column = m_columns - 1;
set_cursor(cursor_row(), new_column);
}
void Terminal::ECH(Parameters params)
{
// Erase characters (without moving cursor)
unsigned num = 1;
if (params.size() >= 1 && params[0] != 0)
num = params[0];
// Clear from cursor to end of line.
for (unsigned i = cursor_column(); i < num; ++i) {
put_character_at(cursor_row(), i, ' ');
}
}
void Terminal::EL(Parameters params)
{
unsigned mode = 0;
if (params.size() >= 1)
mode = params[0];
switch (mode) {
case 0:
// Clear from cursor to end of line.
for (int i = cursor_column(); i < m_columns; ++i) {
put_character_at(cursor_row(), i, ' ');
}
break;
case 1:
// Clear from cursor to beginning of line.
for (int i = 0; i <= cursor_column(); ++i) {
put_character_at(cursor_row(), i, ' ');
}
break;
case 2:
// Clear the complete line
for (int i = 0; i < m_columns; ++i) {
put_character_at(cursor_row(), i, ' ');
}
break;
default:
unimplemented_csi_sequence(params, {}, 'K');
break;
}
}
void Terminal::ED(Parameters params)
{
unsigned mode = 0;
if (params.size() >= 1)
mode = params[0];
switch (mode) {
case 0:
// Clear from cursor to end of screen.
for (int i = cursor_column(); i < m_columns; ++i)
put_character_at(cursor_row(), i, ' ');
for (int row = cursor_row() + 1; row < m_rows; ++row) {
for (int column = 0; column < m_columns; ++column) {
put_character_at(row, column, ' ');
}
}
break;
case 1:
// Clear from cursor to beginning of screen.
for (int i = cursor_column(); i >= 0; --i)
put_character_at(cursor_row(), i, ' ');
for (int row = cursor_row() - 1; row >= 0; --row) {
for (int column = 0; column < m_columns; ++column) {
put_character_at(row, column, ' ');
}
}
break;
case 2:
clear();
break;
case 3:
// FIXME: <esc>[3J should also clear the scrollback buffer.
clear();
break;
default:
unimplemented_csi_sequence(params, {}, 'J');
break;
}
}
void Terminal::SU(Parameters params)
{
unsigned count = 1;
if (params.size() >= 1 && params[0] != 0)
count = params[0];
for (u16 i = 0; i < count; i++)
scroll_up();
}
void Terminal::SD(Parameters params)
{
unsigned count = 1;
if (params.size() >= 1 && params[0] != 0)
count = params[0];
for (u16 i = 0; i < count; i++)
scroll_down();
}
void Terminal::DECSCUSR(Parameters params)
{
unsigned style = 1;
if (params.size() >= 1 && params[0] != 0)
style = params[0];
switch (style) {
case 1:
m_client.set_cursor_style(BlinkingBlock);
break;
case 2:
m_client.set_cursor_style(SteadyBlock);
break;
case 3:
m_client.set_cursor_style(BlinkingUnderline);
break;
case 4:
m_client.set_cursor_style(SteadyUnderline);
break;
case 5:
m_client.set_cursor_style(BlinkingBar);
break;
case 6:
m_client.set_cursor_style(SteadyBar);
break;
default:
dbgln("Unknown cursor style {}", style);
}
}
#ifndef KERNEL
void Terminal::IL(Parameters params)
{
unsigned count = 1;
if (params.size() >= 1 && params[0] != 0)
count = params[0];
invalidate_cursor();
for (; count > 0; --count) {
active_buffer().insert(cursor_row(), make<Line>(m_columns));
if (m_scroll_region_bottom + 1 < active_buffer().size())
active_buffer().remove(m_scroll_region_bottom + 1);
else
active_buffer().remove(active_buffer().size() - 1);
}
m_need_full_flush = true;
}
#endif
void Terminal::DA(Parameters)
{
emit_string("\033[?1;0c");
}
#ifndef KERNEL
void Terminal::DL(Parameters params)
{
int count = 1;
if (params.size() >= 1 && params[0] != 0)
count = params[0];
if (count == 1 && cursor_row() == 0) {
scroll_up();
return;
}
int max_count = m_rows - (m_scroll_region_top + cursor_row());
count = min(count, max_count);
for (int c = count; c > 0; --c) {
active_buffer().remove(cursor_row());
if (m_scroll_region_bottom < active_buffer().size())
active_buffer().insert(m_scroll_region_bottom, make<Line>(m_columns));
else
active_buffer().append(make<Line>(m_columns));
}
}
void Terminal::DCH(Parameters params)
{
int num = 1;
if (params.size() >= 1 && params[0] != 0)
num = params[0];
auto& line = active_buffer()[cursor_row()];
// Move n characters of line to the left
for (size_t i = cursor_column(); i < line.length() - num; i++)
line.set_code_point(i, line.code_point(i + num));
// Fill remainder of line with blanks
for (size_t i = line.length() - num; i < line.length(); i++)
line.set_code_point(i, ' ');
line.set_dirty(true);
}
#endif
void Terminal::linefeed()
{
u16 new_row = cursor_row();
if (cursor_row() == m_scroll_region_bottom) {
scroll_up();
} else {
++new_row;
};
// We shouldn't jump to the first column after receiving a line feed.
// The TTY will take care of generating the carriage return.
set_cursor(new_row, cursor_column());
}
void Terminal::carriage_return()
{
set_cursor(cursor_row(), 0);
}
#ifndef KERNEL
void Terminal::scroll_up()
{
dbgln_if(TERMINAL_DEBUG, "Scroll up 1 line");
// NOTE: We have to invalidate the cursor first.
invalidate_cursor();
if (m_scroll_region_top == 0 && !m_use_alternate_screen_buffer) {
auto line = move(active_buffer().ptr_at(m_scroll_region_top));
add_line_to_history(move(line));
m_client.terminal_history_changed();
}
active_buffer().remove(m_scroll_region_top);
active_buffer().insert(m_scroll_region_bottom, make<Line>(m_columns));
m_need_full_flush = true;
}
void Terminal::scroll_down()
{
dbgln_if(TERMINAL_DEBUG, "Scroll down 1 line");
// NOTE: We have to invalidate the cursor first.
invalidate_cursor();
active_buffer().remove(m_scroll_region_bottom);
active_buffer().insert(m_scroll_region_top, make<Line>(m_columns));
m_need_full_flush = true;
}
void Terminal::put_character_at(unsigned row, unsigned column, u32 code_point)
{
VERIFY(row < rows());
VERIFY(column < columns());
auto& line = active_buffer()[row];
line.set_code_point(column, code_point);
line.attribute_at(column) = m_current_state.attribute;
line.attribute_at(column).flags |= Attribute::Touched;
line.set_dirty(true);
m_last_code_point = code_point;
}
#endif
void Terminal::set_cursor(unsigned a_row, unsigned a_column, bool skip_debug)
{
unsigned row = min(a_row, m_rows - 1u);
unsigned column = min(a_column, m_columns - 1u);
if (row == cursor_row() && column == cursor_column())
return;
VERIFY(row < rows());
VERIFY(column < columns());
invalidate_cursor();
m_current_state.cursor.row = row;
m_current_state.cursor.column = column;
m_stomp = false;
invalidate_cursor();
if (!skip_debug)
dbgln_if(TERMINAL_DEBUG, "Set cursor position: {},{}", cursor_row(), cursor_column());
}
void Terminal::NEL()
{
if (cursor_row() == m_scroll_region_bottom)
scroll_up();
else
set_cursor(cursor_row() + 1, 0);
}
void Terminal::IND()
{
// Not equivalent to CUD: if we are at the bottom margin, we have to scroll up.
if (cursor_row() == m_scroll_region_bottom)
scroll_up();
else
set_cursor(cursor_row() + 1, cursor_column());
}
void Terminal::RI()
{
// Not equivalent to CUU : if we at the top margin , we have to scroll down.
if (cursor_row() == m_scroll_region_top)
scroll_down();
else
set_cursor(cursor_row() - 1, cursor_column());
}
void Terminal::DSR(Parameters params)
{
if (params.size() == 1 && params[0] == 5) {
// Device status
emit_string("\033[0n"); // Terminal status OK!
} else if (params.size() == 1 && params[0] == 6) {
// Cursor position query
emit_string(String::formatted("\e[{};{}R", cursor_row() + 1, cursor_column() + 1));
} else {
dbgln("Unknown DSR");
}
}
#ifndef KERNEL
void Terminal::ICH(Parameters params)
{
unsigned num = 1;
if (params.size() >= 1 && params[0] != 0)
num = params[0];
auto& line = active_buffer()[cursor_row()];
// Move characters after cursor to the right
for (unsigned i = line.length() - num; i >= cursor_column(); --i)
line.set_code_point(i + num, line.code_point(i));
// Fill n characters after cursor with blanks
for (unsigned i = 0; i < num; i++)
line.set_code_point(cursor_column() + i, ' ');
line.set_dirty(true);
}
#endif
void Terminal::on_input(u8 byte)
{
m_parser.on_input(byte);
}
void Terminal::emit_code_point(u32 code_point)
{
auto new_column = cursor_column() + 1;
if (new_column < columns()) {
put_character_at(cursor_row(), cursor_column(), code_point);
set_cursor(cursor_row(), new_column, true);
return;
}
if (m_stomp) {
m_stomp = false;
carriage_return();
linefeed();
put_character_at(cursor_row(), cursor_column(), code_point);
set_cursor(cursor_row(), 1);
} else {
// Curious: We wait once on the right-hand side
m_stomp = true;
put_character_at(cursor_row(), cursor_column(), code_point);
}
}
void Terminal::execute_control_code(u8 code)
{
switch (code) {
case '\a':
m_client.beep();
return;
case '\b':
if (cursor_column()) {
set_cursor(cursor_row(), cursor_column() - 1);
return;
}
return;
case '\t': {
for (unsigned i = cursor_column() + 1; i < columns(); ++i) {
if (m_horizontal_tabs[i]) {
set_cursor(cursor_row(), i);
return;
}
}
return;
}
case '\n':
case '\v':
case '\f':
linefeed();
return;
case '\r':
carriage_return();
return;
default:
unimplemented_control_code(code);
}
}
void Terminal::execute_escape_sequence(Intermediates intermediates, bool ignore, u8 last_byte)
{
// FIXME: Handle it somehow?
if (ignore)
dbgln("Escape sequence has its ignore flag set.");
if (intermediates.size() == 0) {
switch (last_byte) {
case 'D':
IND();
return;
case 'E':
NEL();
return;
case 'M':
RI();
return;
case '\\':
// ST (string terminator) -- do nothing
return;
case '7':
DECSC();
return;
case '8':
DECRC();
return;
}
} else if (intermediates[0] == '#') {
switch (last_byte) {
case '8':
// Confidence Test - Fill screen with E's
for (size_t row = 0; row < m_rows; ++row) {
for (size_t column = 0; column < m_columns; ++column) {
put_character_at(row, column, 'E');
}
}
return;
}
}
unimplemented_escape_sequence(intermediates, last_byte);
}
void Terminal::execute_csi_sequence(Parameters parameters, Intermediates intermediates, bool ignore, u8 last_byte)
{
// FIXME: Handle it somehow?
if (ignore)
dbgln("CSI sequence has its ignore flag set.");
switch (last_byte) {
case '@':
ICH(parameters);
break;
case 'A':
CUU(parameters);
break;
case 'B':
CUD(parameters);
break;
case 'C':
CUF(parameters);
break;
case 'D':
CUB(parameters);
break;
case 'E':
CNL(parameters);
break;
case 'F':
CPL(parameters);
break;
case 'G':
CHA(parameters);
break;
case 'H':
CUP(parameters);
break;
case 'J':
ED(parameters);
break;
case 'K':
EL(parameters);
break;
case 'L':
IL(parameters);
break;
case 'M':
DL(parameters);
break;
case 'P':
DCH(parameters);
break;
case 'S':
SU(parameters);
break;
case 'T':
SD(parameters);
break;
case 'X':
ECH(parameters);
break;
case '`':
HPA(parameters);
break;
case 'a':
HPR(parameters);
break;
case 'b':
REP(parameters);
break;
case 'c':
DA(parameters);
break;
case 'd':
VPA(parameters);
break;
case 'e':
VPR(parameters);
break;
case 'f':
HVP(parameters);
break;
case 'h':
SM(parameters, intermediates);
break;
case 'l':
RM(parameters, intermediates);
break;
case 'm':
SGR(parameters);
break;
case 'n':
DSR(parameters);
break;
case 'q':
if (intermediates.size() >= 1 && intermediates[0] == ' ')
DECSCUSR(parameters);
else
unimplemented_csi_sequence(parameters, intermediates, last_byte);
break;
case 'r':
DECSTBM(parameters);
break;
case 's':
SCOSC();
break;
case 't':
XTERM_WM(parameters);
break;
case 'u':
SCORC();
break;
default:
unimplemented_csi_sequence(parameters, intermediates, last_byte);
}
}
void Terminal::execute_osc_sequence(OscParameters parameters, u8 last_byte)
{
auto stringview_ify = [&](size_t param_idx) {
return StringView(parameters[param_idx]);
};
if (parameters.size() == 0 || parameters[0].is_empty()) {
unimplemented_osc_sequence(parameters, last_byte);
return;
}
auto command_number = stringview_ify(0).to_uint();
if (!command_number.has_value()) {
unimplemented_osc_sequence(parameters, last_byte);
return;
}
switch (command_number.value()) {
case 0:
case 1:
case 2:
if (parameters.size() < 2) {
dbgln("Attempted to set window title without any parameters");
} else {
// FIXME: the split breaks titles containing semicolons.
// Should we expose the raw OSC string from the parser? Or join by semicolon?
m_current_window_title = stringview_ify(1).to_string();
m_client.set_window_title(m_current_window_title);
}
break;
case 8:
#ifndef KERNEL
if (parameters.size() < 3) {
dbgln("Attempted to set href but gave too few parameters");
} else if (parameters[1].is_empty() && parameters[2].is_empty()) {
// Clear hyperlink
m_current_state.attribute.href = String();
m_current_state.attribute.href_id = String();
} else {
m_current_state.attribute.href = stringview_ify(2);
// FIXME: Respect the provided ID
m_current_state.attribute.href_id = String::number(m_next_href_id++);
}
#endif
break;
case 9:
if (parameters.size() < 2)
dbgln("Atttempted to set window progress but gave too few parameters");
else if (parameters.size() == 2)
m_client.set_window_progress(stringview_ify(1).to_int().value_or(-1), 0);
else
m_client.set_window_progress(stringview_ify(1).to_int().value_or(-1), stringview_ify(2).to_int().value_or(0));
break;
default:
unimplemented_osc_sequence(parameters, last_byte);
}
}
void Terminal::dcs_hook(Parameters, Intermediates, bool, u8)
{
dbgln("Received DCS parameters, but we don't support it yet");
}
void Terminal::receive_dcs_char(u8 byte)
{
dbgln_if(TERMINAL_DEBUG, "DCS string character {:c}", byte);
}
void Terminal::execute_dcs_sequence()
{
}
void Terminal::inject_string(const StringView& str)
{
for (size_t i = 0; i < str.length(); ++i)
on_input(str[i]);
}
void Terminal::emit_string(const StringView& string)
{
m_client.emit((const u8*)string.characters_without_null_termination(), string.length());
}
void Terminal::handle_key_press(KeyCode key, u32 code_point, u8 flags)
{
bool ctrl = flags & Mod_Ctrl;
bool alt = flags & Mod_Alt;
bool shift = flags & Mod_Shift;
unsigned modifier_mask = int(shift) + (int(alt) << 1) + (int(ctrl) << 2);
auto emit_final_with_modifier = [this, modifier_mask](char final) {
if (modifier_mask)
emit_string(String::formatted("\e[1;{}{:c}", modifier_mask + 1, final));
else
emit_string(String::formatted("\e[{:c}", final));
};
auto emit_tilde_with_modifier = [this, modifier_mask](unsigned num) {
if (modifier_mask)
emit_string(String::formatted("\e[{};{}~", num, modifier_mask + 1));
else
emit_string(String::formatted("\e[{}~", num));
};
switch (key) {
case KeyCode::Key_Up:
emit_final_with_modifier('A');
return;
case KeyCode::Key_Down:
emit_final_with_modifier('B');
return;
case KeyCode::Key_Right:
emit_final_with_modifier('C');
return;
case KeyCode::Key_Left:
emit_final_with_modifier('D');
return;
case KeyCode::Key_Insert:
emit_tilde_with_modifier(2);
return;
case KeyCode::Key_Delete:
emit_tilde_with_modifier(3);
return;
case KeyCode::Key_Home:
emit_final_with_modifier('H');
return;
case KeyCode::Key_End:
emit_final_with_modifier('F');
return;
case KeyCode::Key_PageUp:
emit_tilde_with_modifier(5);
return;
case KeyCode::Key_PageDown:
emit_tilde_with_modifier(6);
return;
case KeyCode::Key_Return:
// The standard says that CR should be generated by the return key.
// The TTY will take care of translating it to CR LF for the terminal.
emit_string("\r");
return;
default:
break;
}
if (!code_point) {
// Probably a modifier being pressed.
return;
}
if (shift && key == KeyCode::Key_Tab) {
emit_string("\033[Z");
return;
}
// 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;
}
}
// Alt modifier sends escape prefix.
if (alt)
emit_string("\033");
StringBuilder sb;
sb.append_code_point(code_point);
emit_string(sb.to_string());
}
void Terminal::unimplemented_control_code(u8 code)
{
dbgln("Unimplemented control code {:02x}", code);
}
void Terminal::unimplemented_escape_sequence(Intermediates intermediates, u8 last_byte)
{
StringBuilder builder;
builder.appendff("Unimplemented escape sequence {:c}", last_byte);
if (!intermediates.is_empty()) {
builder.append(", intermediates: ");
for (size_t i = 0; i < intermediates.size(); ++i)
builder.append((char)intermediates[i]);
}
dbgln("{}", builder.string_view());
}
void Terminal::unimplemented_csi_sequence(Parameters parameters, Intermediates intermediates, u8 last_byte)
{
StringBuilder builder;
builder.appendff("Unimplemented CSI sequence: {:c}", last_byte);
if (!parameters.is_empty()) {
builder.append(", parameters: [");
for (size_t i = 0; i < parameters.size(); ++i)
builder.appendff("{}{}", (i == 0) ? "" : ", ", parameters[i]);
builder.append("]");
}
if (!intermediates.is_empty()) {
builder.append(", intermediates:");
for (size_t i = 0; i < intermediates.size(); ++i)
builder.append((char)intermediates[i]);
}
dbgln("{}", builder.string_view());
}
void Terminal::unimplemented_osc_sequence(OscParameters parameters, u8 last_byte)
{
StringBuilder builder;
builder.appendff("Unimplemented OSC sequence parameters: (bel_terminated={}) [ ", last_byte == '\a');
bool first = true;
for (auto parameter : parameters) {
if (!first)
builder.append(", ");
builder.append("[");
for (auto character : parameter)
builder.append((char)character);
builder.append("]");
first = false;
}
builder.append(" ]");
dbgln("{}", builder.string_view());
}
#ifndef KERNEL
void Terminal::set_size(u16 columns, u16 rows)
{
if (!columns)
columns = 1;
if (!rows)
rows = 1;
if (columns == m_columns && rows == m_rows)
return;
if (rows > m_rows) {
while (m_normal_screen_buffer.size() < rows)
m_normal_screen_buffer.append(make<Line>(columns));
while (m_alternate_screen_buffer.size() < rows)
m_alternate_screen_buffer.append(make<Line>(columns));
} else {
m_normal_screen_buffer.shrink(rows);
m_alternate_screen_buffer.shrink(rows);
}
for (int i = 0; i < rows; ++i) {
m_normal_screen_buffer[i].set_length(columns);
m_alternate_screen_buffer[i].set_length(columns);
}
m_columns = columns;
m_rows = rows;
m_scroll_region_top = 0;
m_scroll_region_bottom = rows - 1;
m_current_state.cursor.clamp(m_rows - 1, m_columns - 1);
m_normal_saved_state.cursor.clamp(m_rows - 1, m_columns - 1);
m_alternate_saved_state.cursor.clamp(m_rows - 1, m_columns - 1);
m_saved_cursor_position.clamp(m_rows - 1, m_columns - 1);
m_horizontal_tabs.resize(columns);
for (unsigned i = 0; i < columns; ++i)
m_horizontal_tabs[i] = (i % 8) == 0;
// Rightmost column is always last tab on line.
m_horizontal_tabs[columns - 1] = 1;
m_client.terminal_did_resize(m_columns, m_rows);
dbgln_if(TERMINAL_DEBUG, "Set terminal size: {}x{}", m_rows, m_columns);
}
#endif
#ifndef KERNEL
void Terminal::invalidate_cursor()
{
active_buffer()[cursor_row()].set_dirty(true);
}
Attribute Terminal::attribute_at(const Position& position) const
{
if (!position.is_valid())
return {};
if (position.row() >= static_cast<int>(line_count()))
return {};
auto& line = this->line(position.row());
if (static_cast<size_t>(position.column()) >= line.length())
return {};
return line.attribute_at(position.column());
}
#endif
}
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