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Terminal.cpp
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Terminal.cpp
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/*
* Copyright (c) 2018-2020, Andreas Kling <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/StringBuilder.h>
#include <AK/StringView.h>
#include <LibVT/Terminal.h>
#include <string.h>
//#define TERMINAL_DEBUG
namespace VT {
Terminal::Terminal(TerminalClient& client)
: m_client(client)
{
}
Terminal::~Terminal()
{
}
void Terminal::clear()
{
for (size_t i = 0; i < rows(); ++i)
m_lines[i].clear(m_current_attribute);
set_cursor(0, 0);
}
void Terminal::clear_including_history()
{
m_history.clear();
m_history_start = 0;
clear();
m_client.terminal_history_changed();
}
inline bool is_valid_parameter_character(u8 ch)
{
return ch >= 0x30 && ch <= 0x3f;
}
inline bool is_valid_intermediate_character(u8 ch)
{
return ch >= 0x20 && ch <= 0x2f;
}
inline bool is_valid_final_character(u8 ch)
{
return ch >= 0x40 && ch <= 0x7e;
}
void Terminal::alter_mode(bool should_set, bool question_param, const ParamVector& params)
{
int mode = 2;
if (params.size() > 0) {
mode = params[0];
}
if (!question_param) {
switch (mode) {
// FIXME: implement *something* for this
default:
unimplemented_escape();
break;
}
} else {
switch (mode) {
case 25:
// Hide cursor command, but doesn't need to be run (for now, because
// we don't do inverse control codes anyways)
if (should_set)
dbgprintf("Terminal: Hide Cursor escapecode recieved. Not needed: ignored.\n");
else
dbgprintf("Terminal: Show Cursor escapecode recieved. Not needed: ignored.\n");
break;
default:
break;
}
}
}
void Terminal::RM(bool question_param, const ParamVector& params)
{
// RM – Reset Mode
alter_mode(true, question_param, params);
}
void Terminal::SM(bool question_param, const ParamVector& params)
{
// SM – Set Mode
alter_mode(false, question_param, params);
}
void Terminal::SGR(const ParamVector& params)
{
// SGR – Select Graphic Rendition
if (params.is_empty()) {
m_current_attribute.reset();
return;
}
if (params.size() >= 3) {
bool should_set = true;
auto kind = params[1];
u32 color = 0;
switch (kind) {
case 5: // 8-bit
color = xterm_colors[params[2]];
break;
case 2: // 24-bit
for (size_t i = 0; i < 3; ++i) {
u8 component = 0;
if (params.size() - 2 > i) {
component = params[i + 2];
}
color <<= 8;
color |= component;
}
break;
default:
should_set = false;
break;
}
if (should_set) {
if (params[0] == 38) {
m_current_attribute.foreground_color = color;
return;
} else if (params[0] == 48) {
m_current_attribute.background_color = color;
return;
}
}
}
for (auto param : params) {
switch (param) {
case 0:
// Reset
m_current_attribute.reset();
break;
case 1:
m_current_attribute.flags |= Attribute::Bold;
break;
case 3:
m_current_attribute.flags |= Attribute::Italic;
break;
case 4:
m_current_attribute.flags |= Attribute::Underline;
break;
case 5:
m_current_attribute.flags |= Attribute::Blink;
break;
case 7:
m_current_attribute.flags |= Attribute::Negative;
break;
case 22:
m_current_attribute.flags &= ~Attribute::Bold;
break;
case 23:
m_current_attribute.flags &= ~Attribute::Italic;
break;
case 24:
m_current_attribute.flags &= ~Attribute::Underline;
break;
case 25:
m_current_attribute.flags &= ~Attribute::Blink;
break;
case 27:
m_current_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_attribute.flags & Attribute::Bold)
param += 8;
m_current_attribute.foreground_color = xterm_colors[param - 30];
break;
case 39:
// reset foreground
m_current_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_attribute.flags & Attribute::Bold)
param += 8;
m_current_attribute.background_color = xterm_colors[param - 40];
break;
case 49:
// reset background
m_current_attribute.background_color = Attribute::default_background_color;
break;
default:
dbgprintf("FIXME: SGR: p: %u\n", param);
}
}
}
void Terminal::escape$s(const ParamVector&)
{
m_saved_cursor_row = m_cursor_row;
m_saved_cursor_column = m_cursor_column;
}
void Terminal::escape$u(const ParamVector&)
{
set_cursor(m_saved_cursor_row, m_saved_cursor_column);
}
void Terminal::escape$t(const ParamVector& params)
{
if (params.size() < 1)
return;
dbgprintf("FIXME: escape$t: Ps: %u (param count: %d)\n", params[0], params.size());
}
void Terminal::DECSTBM(const ParamVector& params)
{
// DECSTBM – Set Top and Bottom Margins ("Scrolling Region")
unsigned top = 1;
unsigned bottom = m_rows;
if (params.size() >= 1)
top = params[0];
if (params.size() >= 2)
bottom = params[1];
if ((bottom - top) < 2 || bottom > m_rows) {
dbgprintf("Error: DECSTBM: scrolling region invalid: %u-%u\n", top, bottom);
return;
}
m_scroll_region_top = top - 1;
m_scroll_region_bottom = bottom - 1;
set_cursor(0, 0);
}
void Terminal::CUP(const ParamVector& params)
{
// CUP – Cursor Position
unsigned row = 1;
unsigned col = 1;
if (params.size() >= 1)
row = params[0];
if (params.size() >= 2)
col = params[1];
set_cursor(row - 1, col - 1);
}
void Terminal::HVP(const ParamVector& params)
{
// HVP – Horizontal and Vertical Position
unsigned row = 1;
unsigned col = 1;
if (params.size() >= 1)
row = params[0];
if (params.size() >= 2)
col = params[1];
set_cursor(row - 1, col - 1);
}
void Terminal::CUU(const ParamVector& params)
{
// CUU – Cursor Up
int num = 1;
if (params.size() >= 1)
num = params[0];
if (num == 0)
num = 1;
int new_row = (int)m_cursor_row - num;
if (new_row < 0)
new_row = 0;
set_cursor(new_row, m_cursor_column);
}
void Terminal::CUD(const ParamVector& params)
{
// CUD – Cursor Down
int num = 1;
if (params.size() >= 1)
num = params[0];
if (num == 0)
num = 1;
int new_row = (int)m_cursor_row + num;
if (new_row >= m_rows)
new_row = m_rows - 1;
set_cursor(new_row, m_cursor_column);
}
void Terminal::CUF(const ParamVector& params)
{
// CUF – Cursor Forward
int num = 1;
if (params.size() >= 1)
num = params[0];
if (num == 0)
num = 1;
int new_column = (int)m_cursor_column + num;
if (new_column >= m_columns)
new_column = m_columns - 1;
set_cursor(m_cursor_row, new_column);
}
void Terminal::CUB(const ParamVector& params)
{
// CUB – Cursor Backward
int num = 1;
if (params.size() >= 1)
num = params[0];
if (num == 0)
num = 1;
int new_column = (int)m_cursor_column - num;
if (new_column < 0)
new_column = 0;
set_cursor(m_cursor_row, new_column);
}
void Terminal::escape$G(const ParamVector& params)
{
int new_column = 1;
if (params.size() >= 1)
new_column = params[0] - 1;
if (new_column < 0)
new_column = 0;
set_cursor(m_cursor_row, new_column);
}
void Terminal::escape$b(const ParamVector& params)
{
if (params.size() < 1)
return;
for (unsigned i = 0; i < params[0]; ++i)
put_character_at(m_cursor_row, m_cursor_column++, m_last_code_point);
}
void Terminal::escape$d(const ParamVector& params)
{
int new_row = 1;
if (params.size() >= 1)
new_row = params[0] - 1;
if (new_row < 0)
new_row = 0;
set_cursor(new_row, m_cursor_column);
}
void Terminal::escape$X(const ParamVector& params)
{
// Erase characters (without moving cursor)
int num = 1;
if (params.size() >= 1)
num = params[0];
if (num == 0)
num = 1;
// Clear from cursor to end of line.
for (int i = m_cursor_column; i < num; ++i) {
put_character_at(m_cursor_row, i, ' ');
}
}
void Terminal::EL(const ParamVector& params)
{
int mode = 0;
if (params.size() >= 1)
mode = params[0];
switch (mode) {
case 0:
// Clear from cursor to end of line.
for (int i = m_cursor_column; i < m_columns; ++i) {
put_character_at(m_cursor_row, i, ' ');
}
break;
case 1:
// Clear from cursor to beginning of line.
for (int i = 0; i <= m_cursor_column; ++i) {
put_character_at(m_cursor_row, i, ' ');
}
break;
case 2:
// Clear the complete line
for (int i = 0; i < m_columns; ++i) {
put_character_at(m_cursor_row, i, ' ');
}
break;
default:
unimplemented_escape();
break;
}
}
void Terminal::ED(const ParamVector& params)
{
// ED - Erase in Display
int mode = 0;
if (params.size() >= 1)
mode = params[0];
switch (mode) {
case 0:
// Clear from cursor to end of screen.
for (int i = m_cursor_column; i < m_columns; ++i)
put_character_at(m_cursor_row, i, ' ');
for (int row = m_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 = m_cursor_column; i >= 0; --i)
put_character_at(m_cursor_row, i, ' ');
for (int row = m_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_escape();
break;
}
}
void Terminal::escape$S(const ParamVector& params)
{
int count = 1;
if (params.size() >= 1)
count = params[0];
for (u16 i = 0; i < count; i++)
scroll_up();
}
void Terminal::escape$T(const ParamVector& params)
{
int count = 1;
if (params.size() >= 1)
count = params[0];
for (u16 i = 0; i < count; i++)
scroll_down();
}
void Terminal::escape$L(const ParamVector& params)
{
int count = 1;
if (params.size() >= 1)
count = params[0];
invalidate_cursor();
for (; count > 0; --count) {
m_lines.insert(m_cursor_row + m_scroll_region_top, make<Line>(m_columns));
if (m_scroll_region_bottom + 1 < m_lines.size())
m_lines.remove(m_scroll_region_bottom + 1);
else
m_lines.remove(m_lines.size() - 1);
}
m_need_full_flush = true;
}
void Terminal::DA(const ParamVector&)
{
// DA - Device Attributes
emit_string("\033[?1;0c");
}
void Terminal::escape$M(const ParamVector& params)
{
int count = 1;
if (params.size() >= 1)
count = params[0];
if (count == 1 && m_cursor_row == 0) {
scroll_up();
return;
}
int max_count = m_rows - (m_scroll_region_top + m_cursor_row);
count = min(count, max_count);
for (int c = count; c > 0; --c) {
m_lines.remove(m_cursor_row + m_scroll_region_top);
if (m_scroll_region_bottom < m_lines.size())
m_lines.insert(m_scroll_region_bottom, make<Line>(m_columns));
else
m_lines.append(make<Line>(m_columns));
}
}
void Terminal::escape$P(const ParamVector& params)
{
int num = 1;
if (params.size() >= 1)
num = params[0];
if (num == 0)
num = 1;
auto& line = m_lines[m_cursor_row];
// Move n characters of line to the left
for (int i = m_cursor_column; i < line.length() - num; i++)
line.set_code_point(i, line.code_point(i + num));
// Fill remainder of line with blanks
for (int i = line.length() - num; i < line.length(); i++)
line.set_code_point(i, ' ');
line.set_dirty(true);
}
void Terminal::execute_xterm_command()
{
ParamVector numeric_params;
auto param_string = String::copy(m_xterm_parameters);
auto params = param_string.split(';', true);
m_xterm_parameters.clear_with_capacity();
for (auto& parampart : params)
numeric_params.append(parampart.to_uint().value_or(0));
while (params.size() < 3) {
params.append(String::empty());
numeric_params.append(0);
}
m_final = '@';
if (numeric_params.is_empty()) {
dbg() << "Empty Xterm params?";
return;
}
switch (numeric_params[0]) {
case 0:
case 1:
case 2:
m_client.set_window_title(params[1]);
break;
case 8:
if (params[2].is_empty()) {
m_current_attribute.href = String();
m_current_attribute.href_id = String();
} else {
m_current_attribute.href = params[2];
// FIXME: Respect the provided ID
m_current_attribute.href_id = String::format("%u", m_next_href_id++);
}
break;
case 9:
m_client.set_window_progress(numeric_params[1], numeric_params[2]);
break;
default:
unimplemented_xterm_escape();
break;
}
}
void Terminal::execute_escape_sequence(u8 final)
{
bool question_param = false;
m_final = final;
ParamVector params;
if (m_parameters.size() > 0 && m_parameters[0] == '?') {
question_param = true;
m_parameters.remove(0);
}
auto paramparts = String::copy(m_parameters).split(';');
for (auto& parampart : paramparts) {
auto value = parampart.to_uint();
if (!value.has_value()) {
// FIXME: Should we do something else?
m_parameters.clear_with_capacity();
m_intermediates.clear_with_capacity();
return;
}
params.append(value.value());
}
#if defined(TERMINAL_DEBUG)
dbgprintf("Terminal::execute_escape_sequence: Handled final '%c'\n", final);
dbgprintf("Params: ");
for (auto& p : params) {
dbgprintf("%d ", p);
}
dbgprintf("\b\n");
#endif
switch (final) {
case 'A':
CUU(params);
break;
case 'B':
CUD(params);
break;
case 'C':
CUF(params);
break;
case 'D':
CUB(params);
break;
case 'H':
CUP(params);
break;
case 'J':
ED(params);
break;
case 'K':
EL(params);
break;
case 'M':
escape$M(params);
break;
case 'P':
escape$P(params);
break;
case 'S':
escape$S(params);
break;
case 'T':
escape$T(params);
break;
case 'L':
escape$L(params);
break;
case 'G':
escape$G(params);
break;
case 'X':
escape$X(params);
break;
case 'b':
escape$b(params);
break;
case 'd':
escape$d(params);
break;
case 'm':
SGR(params);
break;
case 's':
escape$s(params);
break;
case 'u':
escape$u(params);
break;
case 't':
escape$t(params);
break;
case 'r':
DECSTBM(params);
break;
case 'l':
RM(question_param, params);
break;
case 'h':
SM(question_param, params);
break;
case 'c':
DA(params);
break;
case 'f':
HVP(params);
break;
case 'n':
DSR(params);
break;
default:
dbgprintf("Terminal::execute_escape_sequence: Unhandled final '%c'\n", final);
break;
}
#if defined(TERMINAL_DEBUG)
dbgprintf("\n");
for (auto& line : m_lines) {
dbgprintf("Terminal: Line: ");
for (int i = 0; i < line.length(); i++) {
u32 codepoint = line.code_point(i);
if (codepoint < 128)
dbgprintf("%c", (char)codepoint);
else
dbgprintf("<U+%04x>", codepoint);
}
dbgprintf("\n");
}
#endif
m_parameters.clear_with_capacity();
m_intermediates.clear_with_capacity();
}
void Terminal::newline()
{
u16 new_row = m_cursor_row;
if (m_cursor_row == m_scroll_region_bottom) {
scroll_up();
} else {
++new_row;
}
set_cursor(new_row, 0);
}
void Terminal::scroll_up()
{
// NOTE: We have to invalidate the cursor first.
invalidate_cursor();
if (m_scroll_region_top == 0) {
auto line = move(m_lines.ptr_at(m_scroll_region_top));
add_line_to_history(move(line));
m_client.terminal_history_changed();
}
m_lines.remove(m_scroll_region_top);
m_lines.insert(m_scroll_region_bottom, make<Line>(m_columns));
m_need_full_flush = true;
}
void Terminal::scroll_down()
{
// NOTE: We have to invalidate the cursor first.
invalidate_cursor();
m_lines.remove(m_scroll_region_bottom);
m_lines.insert(m_scroll_region_top, make<Line>(m_columns));
m_need_full_flush = true;
}
void Terminal::set_cursor(unsigned a_row, unsigned a_column)
{
unsigned row = min(a_row, m_rows - 1u);
unsigned column = min(a_column, m_columns - 1u);
if (row == m_cursor_row && column == m_cursor_column)
return;
ASSERT(row < rows());
ASSERT(column < columns());
invalidate_cursor();
m_cursor_row = row;
m_cursor_column = column;
m_stomp = false;
invalidate_cursor();
}
void Terminal::put_character_at(unsigned row, unsigned column, u32 code_point)
{
ASSERT(row < rows());
ASSERT(column < columns());
auto& line = m_lines[row];
line.set_code_point(column, code_point);
line.attributes()[column] = m_current_attribute;
line.attributes()[column].flags |= Attribute::Touched;
line.set_dirty(true);
m_last_code_point = code_point;
}
void Terminal::NEL()
{
// NEL - Next Line
newline();
}
void Terminal::IND()
{
// IND - Index (move down)
CUD({});
}
void Terminal::RI()
{
// RI - Reverse Index (move up)
CUU({});
}
void Terminal::DSR(const ParamVector& 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::format("\033[%d;%dR", m_cursor_row + 1, m_cursor_column + 1));
} else {
dbg() << "Unknown DSR";
}
}
void Terminal::on_input(u8 ch)
{
#ifdef TERMINAL_DEBUG
dbgprintf("Terminal::on_char: %b (%c), fg=%u, bg=%u\n", ch, ch, m_current_attribute.foreground_color, m_current_attribute.background_color);
#endif
auto fail_utf8_parse = [this] {
m_parser_state = Normal;
on_code_point('%');
};
auto advance_utf8_parse = [this, ch] {
m_parser_code_point <<= 6;
m_parser_code_point |= ch & 0x3f;
if (m_parser_state == UTF8Needs1Byte) {
on_code_point(m_parser_code_point);
m_parser_state = Normal;
} else {
m_parser_state = (ParserState)(m_parser_state + 1);
}
};
switch (m_parser_state) {
case GotEscape:
if (ch == '[') {
m_parser_state = ExpectParameter;
} else if (ch == '(') {
m_swallow_current = true;
m_parser_state = ExpectParameter;
} else if (ch == ']') {
m_parser_state = ExpectXtermParameter;
m_xterm_parameters.clear_with_capacity();
} else if (ch == '#') {
m_parser_state = ExpectHashtagDigit;
} else if (ch == 'D') {
IND();
m_parser_state = Normal;
return;
} else if (ch == 'M') {
RI();
m_parser_state = Normal;
return;
} else if (ch == 'E') {
NEL();
m_parser_state = Normal;
return;
} else {
dbg() << "Unexpected character in GotEscape '" << (char)ch << "'";
m_parser_state = Normal;
}
return;
case ExpectHashtagDigit:
if (ch >= '0' && ch <= '9') {
execute_hashtag(ch);
m_parser_state = Normal;
}
return;
case ExpectXtermParameter:
if (ch == 27) {
m_parser_state = ExpectStringTerminator;
return;
}
if (ch == 7) {
execute_xterm_command();
m_parser_state = Normal;
return;
}
m_xterm_parameters.append(ch);
return;
case ExpectStringTerminator:
if (ch == '\\')
execute_xterm_command();
else
dbg() << "Unexpected string terminator: " << String::format("%02x", ch);
m_parser_state = Normal;
return;
case ExpectParameter:
if (is_valid_parameter_character(ch)) {
m_parameters.append(ch);
return;
}
m_parser_state = ExpectIntermediate;
[[fallthrough]];
case ExpectIntermediate:
if (is_valid_intermediate_character(ch)) {
m_intermediates.append(ch);
return;
}
m_parser_state = ExpectFinal;
[[fallthrough]];
case ExpectFinal:
if (is_valid_final_character(ch)) {
m_parser_state = Normal;
if (!m_swallow_current)
execute_escape_sequence(ch);
m_swallow_current = false;
return;
}
m_parser_state = Normal;
m_swallow_current = false;
return;
case UTF8Needs1Byte:
case UTF8Needs2Bytes:
case UTF8Needs3Bytes:
if ((ch & 0xc0) != 0x80) {
fail_utf8_parse();
} else {
advance_utf8_parse();
}
return;
case Normal:
if (!(ch & 0x80))
break;
if ((ch & 0xe0) == 0xc0) {
m_parser_state = UTF8Needs1Byte;
m_parser_code_point = ch & 0x1f;
return;
}
if ((ch & 0xf0) == 0xe0) {
m_parser_state = UTF8Needs2Bytes;
m_parser_code_point = ch & 0x0f;
return;
}
if ((ch & 0xf8) == 0xf0) {
m_parser_state = UTF8Needs3Bytes;
m_parser_code_point = ch & 0x07;
return;
}
fail_utf8_parse();
return;
}
switch (ch) {
case '\0':
return;
case '\033':
m_parser_state = GotEscape;
m_swallow_current = false;
return;
case 8: // Backspace
if (m_cursor_column) {
set_cursor(m_cursor_row, m_cursor_column - 1);
return;
}
return;
case '\a':
m_client.beep();
return;
case '\t': {
for (unsigned i = m_cursor_column + 1; i < columns(); ++i) {
if (m_horizontal_tabs[i]) {
set_cursor(m_cursor_row, i);
return;
}
}
return;
}
case '\r':
set_cursor(m_cursor_row, 0);
return;
case '\n':
newline();
return;
}
on_code_point(ch);
}
void Terminal::on_code_point(u32 code_point)
{
auto new_column = m_cursor_column + 1;
if (new_column < columns()) {
put_character_at(m_cursor_row, m_cursor_column, code_point);
set_cursor(m_cursor_row, new_column);
return;
}