minetest/src/chat.h

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/*
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Minetest
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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.
*/
#pragma once
#include <string>
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#include <vector>
#include <list>
#include "irrlichttypes.h"
#include "util/enriched_string.h"
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#include "settings.h"
// Chat console related classes
struct ChatLine
{
// age in seconds
f32 age = 0.0f;
// name of sending player, or empty if sent by server
EnrichedString name;
// message text
EnrichedString text;
ChatLine(const std::wstring &a_name, const std::wstring &a_text):
name(a_name),
text(a_text)
{
}
ChatLine(const EnrichedString &a_name, const EnrichedString &a_text):
name(a_name),
text(a_text)
{
}
};
struct ChatFormattedFragment
{
// text string
EnrichedString text;
// starting column
u32 column;
// formatting
//u8 bold:1;
};
struct ChatFormattedLine
{
// Array of text fragments
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std::vector<ChatFormattedFragment> fragments;
// true if first line of one formatted ChatLine
bool first;
};
class ChatBuffer
{
public:
ChatBuffer(u32 scrollback);
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~ChatBuffer() = default;
// Append chat line
// Removes oldest chat line if scrollback size is reached
void addLine(std::wstring name, std::wstring text);
// Remove all chat lines
void clear();
// Get number of lines currently in buffer.
u32 getLineCount() const;
// Get reference to i-th chat line.
const ChatLine& getLine(u32 index) const;
// Increase each chat line's age by dtime.
void step(f32 dtime);
// Delete oldest N chat lines.
void deleteOldest(u32 count);
// Delete lines older than maxAge.
void deleteByAge(f32 maxAge);
// Get number of columns, 0 if reformat has not been called yet.
u32 getColumns() const;
// Get number of rows, 0 if reformat has not been called yet.
u32 getRows() const;
// Update console size and reformat all formatted lines.
void reformat(u32 cols, u32 rows);
// Get formatted line for a given row (0 is top of screen).
// Only valid after reformat has been called at least once
const ChatFormattedLine& getFormattedLine(u32 row) const;
// Scrolling in formatted buffer (relative)
// positive rows == scroll up, negative rows == scroll down
void scroll(s32 rows);
// Scrolling in formatted buffer (absolute)
void scrollAbsolute(s32 scroll);
// Scroll to bottom of buffer (newest)
void scrollBottom();
// Scroll to top of buffer (oldest)
void scrollTop();
// Format a chat line for the given number of columns.
// Appends the formatted lines to the destination array and
// returns the number of formatted lines.
u32 formatChatLine(const ChatLine& line, u32 cols,
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std::vector<ChatFormattedLine>& destination) const;
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void resize(u32 scrollback);
protected:
s32 getTopScrollPos() const;
s32 getBottomScrollPos() const;
private:
// Scrollback size
u32 m_scrollback;
// Array of unformatted chat lines
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std::vector<ChatLine> m_unformatted;
// Number of character columns in console
u32 m_cols = 0;
// Number of character rows in console
u32 m_rows = 0;
// Scroll position (console's top line index into m_formatted)
s32 m_scroll = 0;
// Array of formatted lines
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std::vector<ChatFormattedLine> m_formatted;
// Empty formatted line, for error returns
ChatFormattedLine m_empty_formatted_line;
};
class ChatPrompt
{
public:
ChatPrompt(const std::wstring &prompt, u32 history_limit);
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~ChatPrompt() = default;
// Input character or string
void input(wchar_t ch);
void input(const std::wstring &str);
// Add a string to the history
void addToHistory(std::wstring line);
// Get current line
std::wstring getLine() const { return m_line; }
// Get section of line that is currently selected
std::wstring getSelection() const { return m_line.substr(m_cursor, m_cursor_len); }
// Clear the current line
void clear();
// Replace the current line with the given text
std::wstring replace(std::wstring line);
// Select previous command from history
void historyPrev();
// Select next command from history
void historyNext();
// Nick completion
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void nickCompletion(const std::list<std::string>& names, bool backwards);
// Update console size and reformat the visible portion of the prompt
void reformat(u32 cols);
// Get visible portion of the prompt.
std::wstring getVisiblePortion() const;
// Get cursor position (relative to visible portion). -1 if invalid
s32 getVisibleCursorPosition() const;
// Get length of cursor selection
s32 getCursorLength() const { return m_cursor_len; }
// Cursor operations
enum CursorOp {
CURSOROP_MOVE,
CURSOROP_SELECT,
CURSOROP_DELETE
};
// Cursor operation direction
enum CursorOpDir {
CURSOROP_DIR_LEFT,
CURSOROP_DIR_RIGHT
};
// Cursor operation scope
enum CursorOpScope {
CURSOROP_SCOPE_CHARACTER,
CURSOROP_SCOPE_WORD,
CURSOROP_SCOPE_LINE,
CURSOROP_SCOPE_SELECTION
};
// Cursor operation
// op specifies whether it's a move or delete operation
// dir specifies whether the operation goes left or right
// scope specifies how far the operation will reach (char/word/line)
// Examples:
// cursorOperation(CURSOROP_MOVE, CURSOROP_DIR_RIGHT, CURSOROP_SCOPE_LINE)
// moves the cursor to the end of the line.
// cursorOperation(CURSOROP_DELETE, CURSOROP_DIR_LEFT, CURSOROP_SCOPE_WORD)
// deletes the word to the left of the cursor.
void cursorOperation(CursorOp op, CursorOpDir dir, CursorOpScope scope);
protected:
// set m_view to ensure that 0 <= m_view <= m_cursor < m_view + m_cols
// if line can be fully shown, set m_view to zero
// else, also ensure m_view <= m_line.size() + 1 - m_cols
void clampView();
private:
// Prompt prefix
std::wstring m_prompt = L"";
// Currently edited line
std::wstring m_line = L"";
// History buffer
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std::vector<std::wstring> m_history;
// History index (0 <= m_history_index <= m_history.size())
u32 m_history_index = 0;
// Maximum number of history entries
u32 m_history_limit;
// Number of columns excluding columns reserved for the prompt
s32 m_cols = 0;
// Start of visible portion (index into m_line)
s32 m_view = 0;
// Cursor (index into m_line)
s32 m_cursor = 0;
// Cursor length (length of selected portion of line)
s32 m_cursor_len = 0;
// Last nick completion start (index into m_line)
s32 m_nick_completion_start = 0;
// Last nick completion start (index into m_line)
s32 m_nick_completion_end = 0;
};
class ChatBackend
{
public:
ChatBackend();
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~ChatBackend() = default;
// Add chat message
void addMessage(std::wstring name, std::wstring text);
// Parse and add unparsed chat message
void addUnparsedMessage(std::wstring line);
// Get the console buffer
ChatBuffer& getConsoleBuffer();
// Get the recent messages buffer
ChatBuffer& getRecentBuffer();
// Concatenate all recent messages
EnrichedString getRecentChat();
// Get the console prompt
ChatPrompt& getPrompt();
// Reformat all buffers
void reformat(u32 cols, u32 rows);
// Clear all recent messages
void clearRecentChat();
// Age recent messages
void step(float dtime);
// Scrolling
void scroll(s32 rows);
void scrollPageDown();
void scrollPageUp();
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// Resize recent buffer based on settings
void applySettings(Settings* settings);
private:
ChatBuffer m_console_buffer;
ChatBuffer m_recent_buffer;
ChatPrompt m_prompt;
};