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/** \file teletype.cc */ // -*-c++-*-
// Copyright (C) 2010 Daniel Burrows
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
// Local includes:
#include "teletype.h"
#include "terminal.h"
// System includes:
#include <boost/make_shared.hpp>
using boost::make_shared;
using boost::shared_ptr;
using testing::AnyNumber;
using testing::Invoke;
using testing::NiceMock;
using testing::StrictMock;
using testing::_;
namespace aptitude
{
namespace cmdline
{
namespace mocks
{
teletype::~teletype()
{
}
namespace
{
class teletype_with_terminal : public teletype
{
std::wstring last_line;
// The index of the character containing the cursor:
unsigned int cursor_idx;
// The character cell containing the cursor:
unsigned int cursor_position;
const shared_ptr<terminal_locale> term_locale;
const shared_ptr<terminal_metrics> term_metrics;
const shared_ptr<terminal_with_combined_output> term_output;
void scroll_line(std::wstring &new_last_line);
void do_set_last_line(const std::wstring &new_last_line);
void handle_output(const std::wstring &output);
void handle_move_to_beginning_of_line();
/** \brief Return the column width of the given character,
* or 0 if it's not printable (instead of -1).
*/
int safe_wcwidth(wchar_t c)
{
const int rval = term_locale->wcwidth(c);
if(rval < 0)
return 0;
else
return rval;
}
public:
teletype_with_terminal(const shared_ptr<terminal_locale> &_term_locale,
const shared_ptr<terminal_metrics> &_term_metrics,
const shared_ptr<terminal_with_combined_output> &_term_output)
: cursor_idx(0),
cursor_position(0),
term_locale(_term_locale),
term_metrics(_term_metrics),
term_output(_term_output)
{
EXPECT_CALL(*term_output, output(_))
.WillRepeatedly(Invoke(this, &teletype_with_terminal::handle_output));
}
};
void teletype_with_terminal::scroll_line(std::wstring &new_last_line)
{
do_set_last_line(new_last_line);
last_line.clear();
new_last_line.clear();
cursor_idx = 0;
cursor_position = 0;
newline();
}
void teletype_with_terminal::do_set_last_line(const std::wstring &new_last_line)
{
if(new_last_line != last_line)
{
last_line = new_last_line;
set_last_line(new_last_line);
}
}
void teletype_with_terminal::handle_output(const std::wstring &output)
{
std::wstring new_last_line = last_line;
const unsigned int screen_width = term_metrics->get_screen_width();
for(std::wstring::const_iterator it = output.begin();
it != output.end(); ++it)
{
const wchar_t c = *it;
switch(c)
{
case '\n':
scroll_line(new_last_line);
break;
case '\r':
cursor_idx = 0;
cursor_position = 0;
break;
default:
{
const int c_width = safe_wcwidth(c);
if(cursor_position + c_width > screen_width)
{
scroll_line(new_last_line);
// Now that we've moved to the next line, we
// still need to output the character that
// caused the scroll. This breaks if the screen
// width is 0 -- don't do that.
new_last_line.push_back(c);
cursor_position += c_width;
++cursor_idx;
}
else
{
if(cursor_idx < new_last_line.size())
{
// This is an overwrite. Find the character
// or characters that were overwritten and
// replace them with the new character. If
// some of the cells containing the old
// character aren't filled, fill them with
// spaces.
//
// Note that we don't handle the case where
// we start writing in the middle of a
// character, since that can't happen (since
// the cursor starts at the left and only
// moves via writes).
int chars_to_replace = 0;
int replaced_width = 0;
while(replaced_width < c_width)
{
const int replace_idx =
cursor_idx + chars_to_replace;
const int previous_width =
safe_wcwidth(new_last_line[replace_idx]);
++chars_to_replace;
replaced_width += previous_width;
}
std::wstring new_text;
new_text.push_back(c);
for(int i = c_width; i < replaced_width; ++i)
new_text.push_back(L' ');
new_last_line.replace(cursor_idx,
chars_to_replace,
new_text);
}
else
{
// Note that cursor_idx should be at
// most last_line.size() + 1; this is just
// for safety's sake.
while(new_last_line.size() + 1 < cursor_idx)
new_last_line.push_back(' ');
new_last_line.push_back(c);
}
cursor_position += c_width;
++cursor_idx;
}
}
}
}
do_set_last_line(new_last_line);
}
}
shared_ptr<teletype>
create_default_teletype(const shared_ptr<terminal_locale> &term_locale,
const shared_ptr<terminal_metrics> &term_metrics,
const boost::shared_ptr<terminal_with_combined_output> &term_output)
{
return make_shared<teletype_with_terminal>(term_locale,
term_metrics,
term_output);
}
shared_ptr<teletype>
create_nice_teletype(const shared_ptr<terminal_locale> &term_locale,
const shared_ptr<terminal_metrics> &term_metrics,
const boost::shared_ptr<terminal_with_combined_output> &term_output)
{
return make_shared<NiceMock<teletype_with_terminal> >(term_locale,
term_metrics,
term_output);
}
shared_ptr<teletype>
create_strict_teletype(const shared_ptr<terminal_locale> &term_locale,
const shared_ptr<terminal_metrics> &term_metrics,
const boost::shared_ptr<terminal_with_combined_output> &term_output)
{
return make_shared<StrictMock<teletype_with_terminal> >(term_locale,
term_metrics,
term_output);
}
}
}
}
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