minetest/src/chat.cpp

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/*
2013-02-24 18:40:43 +01:00
Minetest
2013-02-24 19:38:45 +01:00
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "chat.h"
#include "debug.h"
#include <cassert>
#include <cctype>
#include <sstream>
#include "util/string.h"
#include "util/numeric.h"
ChatBuffer::ChatBuffer(u32 scrollback):
m_scrollback(scrollback),
m_unformatted(),
m_cols(0),
m_rows(0),
m_scroll(0),
m_formatted(),
m_empty_formatted_line()
{
if (m_scrollback == 0)
m_scrollback = 1;
m_empty_formatted_line.first = true;
}
ChatBuffer::~ChatBuffer()
{
}
void ChatBuffer::addLine(std::wstring name, std::wstring text)
{
ChatLine line(name, text);
m_unformatted.push_back(line);
if (m_rows > 0)
{
// m_formatted is valid and must be kept valid
bool scrolled_at_bottom = (m_scroll == getBottomScrollPos());
u32 num_added = formatChatLine(line, m_cols, m_formatted);
if (scrolled_at_bottom)
m_scroll += num_added;
}
// Limit number of lines by m_scrollback
if (m_unformatted.size() > m_scrollback)
{
deleteOldest(m_unformatted.size() - m_scrollback);
}
}
void ChatBuffer::clear()
{
m_unformatted.clear();
m_formatted.clear();
m_scroll = 0;
}
u32 ChatBuffer::getLineCount() const
{
return m_unformatted.size();
}
u32 ChatBuffer::getScrollback() const
{
return m_scrollback;
}
const ChatLine& ChatBuffer::getLine(u32 index) const
{
assert(index < getLineCount());
return m_unformatted[index];
}
void ChatBuffer::step(f32 dtime)
{
for (u32 i = 0; i < m_unformatted.size(); ++i)
{
m_unformatted[i].age += dtime;
}
}
void ChatBuffer::deleteOldest(u32 count)
{
u32 del_unformatted = 0;
u32 del_formatted = 0;
while (count > 0 && del_unformatted < m_unformatted.size())
{
++del_unformatted;
// keep m_formatted in sync
if (del_formatted < m_formatted.size())
{
assert(m_formatted[del_formatted].first);
++del_formatted;
while (del_formatted < m_formatted.size() &&
!m_formatted[del_formatted].first)
++del_formatted;
}
--count;
}
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m_unformatted.erase(m_unformatted.begin(), m_unformatted.begin() + del_unformatted);
m_formatted.erase(m_formatted.begin(), m_formatted.begin() + del_formatted);
}
void ChatBuffer::deleteByAge(f32 maxAge)
{
u32 count = 0;
while (count < m_unformatted.size() && m_unformatted[count].age > maxAge)
++count;
deleteOldest(count);
}
u32 ChatBuffer::getColumns() const
{
return m_cols;
}
u32 ChatBuffer::getRows() const
{
return m_rows;
}
void ChatBuffer::reformat(u32 cols, u32 rows)
{
if (cols == 0 || rows == 0)
{
// Clear formatted buffer
m_cols = 0;
m_rows = 0;
m_scroll = 0;
m_formatted.clear();
}
else if (cols != m_cols || rows != m_rows)
{
// TODO: Avoid reformatting ALL lines (even inivisble ones)
// each time the console size changes.
// Find out the scroll position in *unformatted* lines
u32 restore_scroll_unformatted = 0;
u32 restore_scroll_formatted = 0;
bool at_bottom = (m_scroll == getBottomScrollPos());
if (!at_bottom)
{
for (s32 i = 0; i < m_scroll; ++i)
{
if (m_formatted[i].first)
++restore_scroll_unformatted;
}
}
// If number of columns change, reformat everything
if (cols != m_cols)
{
m_formatted.clear();
for (u32 i = 0; i < m_unformatted.size(); ++i)
{
if (i == restore_scroll_unformatted)
restore_scroll_formatted = m_formatted.size();
formatChatLine(m_unformatted[i], cols, m_formatted);
}
}
// Update the console size
m_cols = cols;
m_rows = rows;
// Restore the scroll position
if (at_bottom)
{
scrollBottom();
}
else
{
scrollAbsolute(restore_scroll_formatted);
}
}
}
const ChatFormattedLine& ChatBuffer::getFormattedLine(u32 row) const
{
s32 index = m_scroll + (s32) row;
if (index >= 0 && index < (s32) m_formatted.size())
return m_formatted[index];
else
return m_empty_formatted_line;
}
void ChatBuffer::scroll(s32 rows)
{
scrollAbsolute(m_scroll + rows);
}
void ChatBuffer::scrollAbsolute(s32 scroll)
{
s32 top = getTopScrollPos();
s32 bottom = getBottomScrollPos();
m_scroll = scroll;
if (m_scroll < top)
m_scroll = top;
if (m_scroll > bottom)
m_scroll = bottom;
}
void ChatBuffer::scrollBottom()
{
m_scroll = getBottomScrollPos();
}
void ChatBuffer::scrollTop()
{
m_scroll = getTopScrollPos();
}
u32 ChatBuffer::formatChatLine(const ChatLine& line, u32 cols,
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std::vector<ChatFormattedLine>& destination) const
{
u32 num_added = 0;
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std::vector<ChatFormattedFragment> next_frags;
ChatFormattedLine next_line;
ChatFormattedFragment temp_frag;
u32 out_column = 0;
u32 in_pos = 0;
u32 hanging_indentation = 0;
// Format the sender name and produce fragments
if (!line.name.empty())
{
temp_frag.text = L"<";
temp_frag.column = 0;
//temp_frag.bold = 0;
next_frags.push_back(temp_frag);
temp_frag.text = line.name;
temp_frag.column = 0;
//temp_frag.bold = 1;
next_frags.push_back(temp_frag);
temp_frag.text = L"> ";
temp_frag.column = 0;
//temp_frag.bold = 0;
next_frags.push_back(temp_frag);
}
// Choose an indentation level
if (line.name.empty())
{
// Server messages
hanging_indentation = 0;
}
else if (line.name.size() + 3 <= cols/2)
{
// Names shorter than about half the console width
hanging_indentation = line.name.size() + 3;
}
else
{
// Very long names
hanging_indentation = 2;
}
next_line.first = true;
bool text_processing = false;
// Produce fragments and layout them into lines
while (!next_frags.empty() || in_pos < line.text.size())
{
// Layout fragments into lines
while (!next_frags.empty())
{
ChatFormattedFragment& frag = next_frags[0];
if (frag.text.size() <= cols - out_column)
{
// Fragment fits into current line
frag.column = out_column;
next_line.fragments.push_back(frag);
out_column += frag.text.size();
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next_frags.erase(next_frags.begin());
}
else
{
// Fragment does not fit into current line
// So split it up
temp_frag.text = frag.text.substr(0, cols - out_column);
temp_frag.column = out_column;
//temp_frag.bold = frag.bold;
next_line.fragments.push_back(temp_frag);
frag.text = frag.text.substr(cols - out_column);
out_column = cols;
}
if (out_column == cols || text_processing)
{
// End the current line
destination.push_back(next_line);
num_added++;
next_line.fragments.clear();
next_line.first = false;
out_column = text_processing ? hanging_indentation : 0;
}
}
// Produce fragment
if (in_pos < line.text.size())
{
u32 remaining_in_input = line.text.size() - in_pos;
u32 remaining_in_output = cols - out_column;
// Determine a fragment length <= the minimum of
// remaining_in_{in,out}put. Try to end the fragment
// on a word boundary.
u32 frag_length = 1, space_pos = 0;
while (frag_length < remaining_in_input &&
frag_length < remaining_in_output)
{
if (isspace(line.text[in_pos + frag_length]))
space_pos = frag_length;
++frag_length;
}
if (space_pos != 0 && frag_length < remaining_in_input)
frag_length = space_pos + 1;
temp_frag.text = line.text.substr(in_pos, frag_length);
temp_frag.column = 0;
//temp_frag.bold = 0;
next_frags.push_back(temp_frag);
in_pos += frag_length;
text_processing = true;
}
}
// End the last line
if (num_added == 0 || !next_line.fragments.empty())
{
destination.push_back(next_line);
num_added++;
}
return num_added;
}
s32 ChatBuffer::getTopScrollPos() const
{
s32 formatted_count = (s32) m_formatted.size();
s32 rows = (s32) m_rows;
if (rows == 0)
return 0;
else if (formatted_count <= rows)
return formatted_count - rows;
else
return 0;
}
s32 ChatBuffer::getBottomScrollPos() const
{
s32 formatted_count = (s32) m_formatted.size();
s32 rows = (s32) m_rows;
if (rows == 0)
return 0;
else
return formatted_count - rows;
}
ChatPrompt::ChatPrompt(std::wstring prompt, u32 history_limit):
m_prompt(prompt),
m_line(L""),
m_history(),
m_history_index(0),
m_history_limit(history_limit),
m_cols(0),
m_view(0),
m_cursor(0),
m_nick_completion_start(0),
m_nick_completion_end(0)
{
}
ChatPrompt::~ChatPrompt()
{
}
void ChatPrompt::input(wchar_t ch)
{
m_line.insert(m_cursor, 1, ch);
m_cursor++;
clampView();
m_nick_completion_start = 0;
m_nick_completion_end = 0;
}
std::wstring ChatPrompt::submit()
{
std::wstring line = m_line;
m_line.clear();
if (!line.empty())
m_history.push_back(line);
if (m_history.size() > m_history_limit)
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m_history.erase(m_history.begin());
m_history_index = m_history.size();
m_view = 0;
m_cursor = 0;
m_nick_completion_start = 0;
m_nick_completion_end = 0;
return line;
}
void ChatPrompt::clear()
{
m_line.clear();
m_view = 0;
m_cursor = 0;
m_nick_completion_start = 0;
m_nick_completion_end = 0;
}
void ChatPrompt::replace(std::wstring line)
{
m_line = line;
m_view = m_cursor = line.size();
clampView();
m_nick_completion_start = 0;
m_nick_completion_end = 0;
}
void ChatPrompt::historyPrev()
{
if (m_history_index != 0)
{
--m_history_index;
replace(m_history[m_history_index]);
}
}
void ChatPrompt::historyNext()
{
if (m_history_index + 1 >= m_history.size())
{
m_history_index = m_history.size();
replace(L"");
}
else
{
++m_history_index;
replace(m_history[m_history_index]);
}
}
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void ChatPrompt::nickCompletion(const std::list<std::string>& names, bool backwards)
{
// Two cases:
// (a) m_nick_completion_start == m_nick_completion_end == 0
// Then no previous nick completion is active.
// Get the word around the cursor and replace with any nick
// that has that word as a prefix.
// (b) else, continue a previous nick completion.
// m_nick_completion_start..m_nick_completion_end are the
// interval where the originally used prefix was. Cycle
// through the list of completions of that prefix.
u32 prefix_start = m_nick_completion_start;
u32 prefix_end = m_nick_completion_end;
bool initial = (prefix_end == 0);
if (initial)
{
// no previous nick completion is active
prefix_start = prefix_end = m_cursor;
while (prefix_start > 0 && !isspace(m_line[prefix_start-1]))
--prefix_start;
while (prefix_end < m_line.size() && !isspace(m_line[prefix_end]))
++prefix_end;
if (prefix_start == prefix_end)
return;
}
std::wstring prefix = m_line.substr(prefix_start, prefix_end - prefix_start);
// find all names that start with the selected prefix
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std::vector<std::wstring> completions;
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for (std::list<std::string>::const_iterator
i = names.begin();
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i != names.end(); ++i)
{
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if (str_starts_with(narrow_to_wide(*i), prefix, true))
{
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std::wstring completion = narrow_to_wide(*i);
if (prefix_start == 0)
completion += L":";
completions.push_back(completion);
}
}
if (completions.empty())
return;
// find a replacement string and the word that will be replaced
u32 word_end = prefix_end;
u32 replacement_index = 0;
if (!initial)
{
while (word_end < m_line.size() && !isspace(m_line[word_end]))
++word_end;
std::wstring word = m_line.substr(prefix_start, word_end - prefix_start);
// cycle through completions
for (u32 i = 0; i < completions.size(); ++i)
{
if (str_equal(word, completions[i], true))
{
if (backwards)
replacement_index = i + completions.size() - 1;
else
replacement_index = i + 1;
replacement_index %= completions.size();
break;
}
}
}
std::wstring replacement = completions[replacement_index] + L" ";
if (word_end < m_line.size() && isspace(word_end))
++word_end;
// replace existing word with replacement word,
// place the cursor at the end and record the completion prefix
m_line.replace(prefix_start, word_end - prefix_start, replacement);
m_cursor = prefix_start + replacement.size();
clampView();
m_nick_completion_start = prefix_start;
m_nick_completion_end = prefix_end;
}
void ChatPrompt::reformat(u32 cols)
{
if (cols <= m_prompt.size())
{
m_cols = 0;
m_view = m_cursor;
}
else
{
s32 length = m_line.size();
bool was_at_end = (m_view + m_cols >= length + 1);
m_cols = cols - m_prompt.size();
if (was_at_end)
m_view = length;
clampView();
}
}
std::wstring ChatPrompt::getVisiblePortion() const
{
return m_prompt + m_line.substr(m_view, m_cols);
}
s32 ChatPrompt::getVisibleCursorPosition() const
{
return m_cursor - m_view + m_prompt.size();
}
void ChatPrompt::cursorOperation(CursorOp op, CursorOpDir dir, CursorOpScope scope)
{
s32 old_cursor = m_cursor;
s32 new_cursor = m_cursor;
s32 length = m_line.size();
s32 increment = (dir == CURSOROP_DIR_RIGHT) ? 1 : -1;
if (scope == CURSOROP_SCOPE_CHARACTER)
{
new_cursor += increment;
}
else if (scope == CURSOROP_SCOPE_WORD)
{
if (increment > 0)
{
// skip one word to the right
while (new_cursor < length && isspace(m_line[new_cursor]))
new_cursor++;
while (new_cursor < length && !isspace(m_line[new_cursor]))
new_cursor++;
while (new_cursor < length && isspace(m_line[new_cursor]))
new_cursor++;
}
else
{
// skip one word to the left
while (new_cursor >= 1 && isspace(m_line[new_cursor - 1]))
new_cursor--;
while (new_cursor >= 1 && !isspace(m_line[new_cursor - 1]))
new_cursor--;
}
}
else if (scope == CURSOROP_SCOPE_LINE)
{
new_cursor += increment * length;
}
new_cursor = MYMAX(MYMIN(new_cursor, length), 0);
if (op == CURSOROP_MOVE)
{
m_cursor = new_cursor;
}
else if (op == CURSOROP_DELETE)
{
if (new_cursor < old_cursor)
{
m_line.erase(new_cursor, old_cursor - new_cursor);
m_cursor = new_cursor;
}
else if (new_cursor > old_cursor)
{
m_line.erase(old_cursor, new_cursor - old_cursor);
m_cursor = old_cursor;
}
}
clampView();
m_nick_completion_start = 0;
m_nick_completion_end = 0;
}
void ChatPrompt::clampView()
{
s32 length = m_line.size();
if (length + 1 <= m_cols)
{
m_view = 0;
}
else
{
m_view = MYMIN(m_view, length + 1 - m_cols);
m_view = MYMIN(m_view, m_cursor);
m_view = MYMAX(m_view, m_cursor - m_cols + 1);
m_view = MYMAX(m_view, 0);
}
}
ChatBackend::ChatBackend():
m_console_buffer(500),
m_recent_buffer(6),
m_prompt(L"]", 500)
{
}
ChatBackend::~ChatBackend()
{
}
void ChatBackend::addMessage(std::wstring name, std::wstring text)
{
// Note: A message may consist of multiple lines, for example the MOTD.
WStrfnd fnd(text);
while (!fnd.atend())
{
std::wstring line = fnd.next(L"\n");
m_console_buffer.addLine(name, line);
m_recent_buffer.addLine(name, line);
}
}
void ChatBackend::addUnparsedMessage(std::wstring message)
{
// TODO: Remove the need to parse chat messages client-side, by sending
// separate name and text fields in TOCLIENT_CHAT_MESSAGE.
if (message.size() >= 2 && message[0] == L'<')
{
std::size_t closing = message.find_first_of(L'>', 1);
if (closing != std::wstring::npos &&
closing + 2 <= message.size() &&
message[closing+1] == L' ')
{
std::wstring name = message.substr(1, closing - 1);
std::wstring text = message.substr(closing + 2);
addMessage(name, text);
return;
}
}
// Unable to parse, probably a server message.
addMessage(L"", message);
}
ChatBuffer& ChatBackend::getConsoleBuffer()
{
return m_console_buffer;
}
ChatBuffer& ChatBackend::getRecentBuffer()
{
return m_recent_buffer;
}
std::wstring ChatBackend::getRecentChat()
{
std::wostringstream stream;
for (u32 i = 0; i < m_recent_buffer.getLineCount(); ++i)
{
const ChatLine& line = m_recent_buffer.getLine(i);
if (i != 0)
stream << L"\n";
if (!line.name.empty())
stream << L"<" << line.name << L"> ";
stream << line.text;
}
return stream.str();
}
ChatPrompt& ChatBackend::getPrompt()
{
return m_prompt;
}
void ChatBackend::reformat(u32 cols, u32 rows)
{
m_console_buffer.reformat(cols, rows);
// no need to reformat m_recent_buffer, its formatted lines
// are not used
m_prompt.reformat(cols);
}
void ChatBackend::clearRecentChat()
{
m_recent_buffer.clear();
}
void ChatBackend::step(float dtime)
{
m_recent_buffer.step(dtime);
m_recent_buffer.deleteByAge(60.0);
// no need to age messages in anything but m_recent_buffer
}
void ChatBackend::scroll(s32 rows)
{
m_console_buffer.scroll(rows);
}
void ChatBackend::scrollPageDown()
{
m_console_buffer.scroll(m_console_buffer.getRows());
}
void ChatBackend::scrollPageUp()
{
m_console_buffer.scroll(-m_console_buffer.getRows());
}