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/*
Minetest
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.
*/

#ifndef STRFND_HEADER
#define STRFND_HEADER

#include <string>

class Strfnd{
    std::string tek;
    unsigned int p;
public:
    void start(std::string niinq){
        tek = niinq;
        p=0;
    }
    unsigned int where(){
        return p;
    }
    void to(unsigned int i){
        p = i;
    }
    std::string what(){
        return tek;
    }
    std::string next(std::string plop){
        //std::cout<<"tek=\""<<tek<<"\" plop=\""<<plop<<"\""<<std::endl;
        size_t n;
        std::string palautus;
        if (p < tek.size())
        {  
            //std::cout<<"\tp<tek.size()"<<std::endl;
            if ((n = tek.find(plop, p)) == std::string::npos || plop == "")
            {  
                //std::cout<<"\t\tn == string::npos || plop == \"\""<<std::endl;
                n = tek.size();
            }
            else
            {  
                //std::cout<<"\t\tn != string::npos"<<std::endl;
            }
            palautus = tek.substr(p, n-p);
            p = n + plop.length();
        }
        //else
            //std::cout<<"\tp>=tek.size()"<<std::endl;
		//std::cout<<"palautus=\""<<palautus<<"\""<<std::endl;
        return palautus;
    }
    
    // Returns substr of tek up to the next occurence of plop that isn't escaped with '\'
    std::string next_esc(std::string plop) {
		size_t n, realp;
		
    	if (p >= tek.size())
    		return "";
		
		realp = p;
		do {
			n = tek.find(plop, p);
			if (n == std::string::npos || plop == "")
				n = tek.length();
			p = n + plop.length();
		} while (n > 0 && tek[n - 1] == '\\');
		
		return tek.substr(realp, n - realp);
    }
    
	void skip_over(std::string chars){
		while(p < tek.size()){
			bool is = false;
			for(unsigned int i=0; i<chars.size(); i++){
				if(chars[i] == tek[p]){
					is = true;
					break;
				}
			}
			if(!is) break;
			p++;
		}
	}
    bool atend(){
        if(p>=tek.size()) return true;
        return false;
    }
    Strfnd(std::string s){
        start(s);
    }
};

class WStrfnd{
    std::wstring tek;
    unsigned int p;
public:
    void start(std::wstring niinq){
        tek = niinq;
        p=0;
    }
    unsigned int where(){
        return p;
    }
    void to(unsigned int i){
        p = i;
    }
    std::wstring what(){
        return tek;
    }
    std::wstring next(std::wstring plop){
        //std::cout<<"tek=\""<<tek<<"\" plop=\""<<plop<<"\""<<std::endl;
        size_t n;
        std::wstring palautus;
        if (p < tek.size())
        {  
            //std::cout<<"\tp<tek.size()"<<std::endl;
            if ((n = tek.find(plop, p)) == std::wstring::npos || plop == L"")
            {  
                //std::cout<<"\t\tn == string::npos || plop == \"\""<<std::endl;
                n = tek.size();
            }
            else
            {  
                //std::cout<<"\t\tn != string::npos"<<std::endl;
            }
            palautus = tek.substr(p, n-p);
            p = n + plop.length();
        }
        //else
            //std::cout<<"\tp>=tek.size()"<<std::endl;
		//std::cout<<"palautus=\""<<palautus<<"\""<<std::endl;
        return palautus;
    }
    
    std::wstring next_esc(std::wstring plop) {
		size_t n, realp;
		
    	if (p >= tek.size())
    		return L"";
		
		realp = p;
		do {
			n = tek.find(plop, p);
			if (n == std::wstring::npos || plop == L"")
				n = tek.length();
			p = n + plop.length();
		} while (n > 0 && tek[n - 1] == '\\');
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/*
Minetest
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 "config.h"
#include "util/strfnd.h"
#include <cctype>
#include <sstream>
#include "util/string.h"
#include "util/numeric.h"

ChatBuffer::ChatBuffer(u32 scrollback):
	m_scrollback(scrollback)
{
	if (m_scrollback == 0)
		m_scrollback = 1;
	m_empty_formatted_line.first = true;
}

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();
}

const ChatLine& ChatBuffer::getLine(u32 index) const
{
	assert(index < getLineCount());	// pre-condition
	return m_unformatted[index];
}

void ChatBuffer::step(f32 dtime)
{
	for (ChatLine &line : m_unformatted) {
		line.age += dtime;
	}
}

void ChatBuffer::deleteOldest(u32 count)
{
	bool at_bottom = (m_scroll == getBottomScrollPos());

	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())
		{

			sanity_check(m_formatted[del_formatted].first);
			++del_formatted;
			while (del_formatted < m_formatted.size() &&
					!m_formatted[del_formatted].first)
				++del_formatted;
		}

		--count;
	}

	m_unformatted.erase(m_unformatted.begin(), m_unformatted.begin() + del_unformatted);
	m_formatted.erase(m_formatted.begin(), m_formatted.begin() + del_formatted);

	if (at_bottom)
		m_scroll = getBottomScrollPos();
	else
		scrollAbsolute(m_scroll - 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 invisible 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];

	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,
		std::vector<ChatFormattedLine>& destination) const
{
	u32 num_added = 0;
	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);
	}

	std::wstring name_sanitized = line.name.c_str();

	// Choose an indentation level
	if (line.name.empty()) {
		// Server messages
		hanging_indentation = 0;
	} else if (name_sanitized.size() + 3 <= cols/2) {
		// Names shorter than about half the console width
		hanging_indentation = line.name.size() + 3;