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/***********************************************************************
* sgr_optimizer.cpp - Combines SGR attributes *
* *
* This file is part of the FINAL CUT widget toolkit *
* *
* Copyright 2019-2023 Markus Gans *
* *
* FINAL CUT 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 3 of *
* the License, or (at your option) any later version. *
* *
* FINAL CUT 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, see *
* <http://www.gnu.org/licenses/>. *
***********************************************************************/
#include <cctype>
#include <cstring>
#include <iostream>
#include <vector>
#include "final/fc.h"
#include "final/output/tty/sgr_optimizer.h"
namespace finalcut
{
//----------------------------------------------------------------------
// class SGRoptimizer
//----------------------------------------------------------------------
// constructors and destructor
//----------------------------------------------------------------------
SGRoptimizer::SGRoptimizer (std::string& sequence)
: seq{sequence}
{
seq.reserve(ATTR_BUF_SIZE);
}
// public methods of SGRoptimizer
//----------------------------------------------------------------------
void SGRoptimizer::optimize()
{
findParameter();
combineParameter();
}
// private methods of SGRoptimizer
//----------------------------------------------------------------------
void SGRoptimizer::findParameter()
{
// Find ANSI X3.64 terminal SGR (Select Graphic Rendition) strings
csi_parameter.clear();
if ( seq.length() < 6 )
return;
std::size_t start{NOT_SET};
bool esc{false};
bool csi{false};
// Find SGR parameter
for (std::size_t index{0}; index < seq.length(); ++index)
{
char ch = seq[index];
if ( csi )
{
if ( start == NOT_SET )
start = index;
if ( std::isdigit(ch) || ch == ';' )
continue;
if ( ch == 'm')
csi_parameter.push_back({start, index});
esc = csi = false;
start = NOT_SET;
}
// Other content
if ( ! csi_parameter.empty() && index > csi_parameter.back().end + 2 )
break;
if ( esc && ch == '[' ) // Esc [
csi = true;
if ( ch == ESC[0] ) // Esc
esc = true;
}
}
//----------------------------------------------------------------------
void SGRoptimizer::combineParameter()
{
// Combine SGR (Select Graphic Rendition) attributes
if ( csi_parameter.size() < 2 )
return;
const auto& first = csi_parameter.front();
std::size_t count = 1;
std::size_t read_pos = 0;
std::size_t write_pos = first.end;
if ( first.start == first.end ) // Esc [ m
{
seq[write_pos] = '0';
write_pos++;
}
seq[write_pos] = ';';
write_pos++;
auto iter = csi_parameter.cbegin() + 1;
const auto end = csi_parameter.cend();
while ( iter != end )
{
count++;
// Copy SGR parameter values
std::size_t param_size = iter->end - iter->start;
std::memcpy(&seq[write_pos], &seq[iter->start], param_size);
write_pos += param_size;
read_pos = iter->end + 1;
// Handle terminating SGR parameter
if ( seq[iter->end] == 'm' )
handleSGRterminating(iter, write_pos, count, csi_parameter.size());
++iter;
}
// Copy remaining characters in the sequence
std::memcpy(&seq[write_pos], &seq[read_pos], seq.size() - read_pos);
write_pos += seq.size() - read_pos;
seq.resize(write_pos);
}
//----------------------------------------------------------------------
inline void SGRoptimizer::handleSGRterminating ( const std::vector<parameter>::const_iterator iter
, std::size_t& write_pos
, std::size_t count
, std::size_t size )
{
if ( iter->start == iter->end ) // Esc [ m
{
seq[write_pos] = '0';
write_pos++;
}
seq[write_pos] = count != size ? ';' : 'm';
write_pos++;
}
} // namespace finalcut
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