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#include "window.hh"
#include "assert.hh"
#include "context.hh"
#include "highlighter.hh"
#include "hook_manager.hh"
#include <algorithm>
#include <sstream>
namespace Kakoune
{
// Implementation in highlighters.cc
void highlight_selections(const Window& window, DisplayBuffer& display_buffer);
void expand_tabulations(const Window& window, DisplayBuffer& display_buffer);
void expand_unprintable(const Window& window, DisplayBuffer& display_buffer);
Window::Window(Buffer& buffer)
: Editor(buffer),
m_hooks(buffer.hooks()),
m_options(buffer.options())
{
Context hook_context{*this};
m_hooks.run_hook("WinCreate", buffer.name(), hook_context);
m_options.register_watcher(*this);
m_builtin_highlighters.append({"tabulations", expand_tabulations});
m_builtin_highlighters.append({"unprintable", expand_unprintable});
m_builtin_highlighters.append({"selections", highlight_selections});
for (auto& option : m_options.flatten_options())
on_option_changed(*option);
}
Window::~Window()
{
m_options.unregister_watcher(*this);
}
void Window::display_selection_at(LineCount line)
{
if (line >= 0 or line < m_dimensions.line)
{
auto cursor_line = main_selection().last().line();
m_position.line = std::max(0_line, cursor_line - line);
}
}
void Window::center_selection()
{
display_selection_at(m_dimensions.line/2_line);
}
void Window::scroll(LineCount offset)
{
m_position.line = std::max(0_line, m_position.line + offset);
}
void Window::update_display_buffer()
{
scroll_to_keep_cursor_visible_ifn();
DisplayBuffer::LineList& lines = m_display_buffer.lines();
lines.clear();
for (LineCount line = 0; line < m_dimensions.line; ++line)
{
LineCount buffer_line = m_position.line + line;
if (buffer_line >= buffer().line_count())
break;
BufferIterator line_begin = buffer().iterator_at_line_begin(buffer_line);
BufferIterator line_end = buffer().iterator_at_line_end(buffer_line);
BufferIterator begin = utf8::advance(line_begin, line_end, (int)m_position.column);
BufferIterator end = utf8::advance(begin, line_end, (int)m_dimensions.column);
lines.push_back(DisplayLine(buffer_line));
lines.back().push_back(DisplayAtom(AtomContent(buffer(), begin.coord(), end.coord())));
}
m_display_buffer.compute_range();
m_highlighters(*this, m_display_buffer);
m_builtin_highlighters(*this, m_display_buffer);
m_display_buffer.optimize();
m_timestamp = buffer().timestamp();
}
void Window::set_position(const DisplayCoord& position)
{
m_position.line = std::max(0_line, position.line);
m_position.column = std::max(0_char, position.column);
}
void Window::set_dimensions(const DisplayCoord& dimensions)
{
m_dimensions = dimensions;
}
static LineCount adapt_view_pos(LineCount line, LineCount offset,
LineCount view_pos, LineCount view_size,
LineCount buffer_size)
{
if (line - offset < view_pos)
return std::max(0_line, line - offset);
else if (line + offset >= view_pos + view_size)
return std::min(buffer_size - view_size,
line + offset - (view_size - 1));
return view_pos;
}
void Window::scroll_to_keep_cursor_visible_ifn()
{
const BufferIterator first = main_selection().first();
const BufferIterator last = main_selection().last();
const LineCount offset = std::min<LineCount>(options()["scrolloff"].get<int>(),
(m_dimensions.line - 1) / 2);
// scroll lines if needed, try to get as much of the selection visible as possible
m_position.line = adapt_view_pos(first.line(), offset, m_position.line,
m_dimensions.line, buffer().line_count());
m_position.line = adapt_view_pos(last.line(), offset, m_position.line,
m_dimensions.line, buffer().line_count());
// highlight only the line containing the cursor
DisplayBuffer display_buffer;
DisplayBuffer::LineList& lines = display_buffer.lines();
lines.push_back(DisplayLine(last.line()));
BufferIterator line_begin = buffer().iterator_at_line_begin(last);
BufferIterator line_end = buffer().iterator_at_line_end(last);
lines.back().push_back(DisplayAtom(AtomContent(buffer(), line_begin.coord(), line_end.coord())));
display_buffer.compute_range();
m_highlighters(*this, display_buffer);
m_builtin_highlighters(*this, display_buffer);
// now we can compute where the cursor is in display columns
// (this is only valid if highlighting one line and multiple lines put
// the cursor in the same position, however I do not find any sane example
// of highlighters not doing that)
CharCount column = 0;
for (auto& atom : lines.back())
{
if (atom.content.has_buffer_range() and
atom.content.begin() <= last.coord() and atom.content.end() > last.coord())
{
if (atom.content.type() == AtomContent::BufferRange)
column += utf8::distance(buffer().iterator_at(atom.content.begin()), last);
else
column += atom.content.content().char_length();
CharCount first_col = first.line() == last.line() ?
utf8::distance(line_begin, first) : 0_char;
if (first_col < m_position.column)
m_position.column = first_col;
else if (column >= m_position.column + m_dimensions.column)
m_position.column = column - (m_dimensions.column - 1);
CharCount last_col = utf8::distance(line_begin, last);
if (last_col < m_position.column)
m_position.column = last_col;
else if (column >= m_position.column + m_dimensions.column)
m_position.column = column - (m_dimensions.column - 1);
return;
}
column += atom.content.content().char_length();
}
if (last != buffer().end())
{
// the cursor should always be visible.
kak_assert(false);
}
}
DisplayCoord Window::display_position(const BufferCoord& coord)
{
DisplayCoord res{0,0};
for (auto& line : m_display_buffer.lines())
{
if (line.buffer_line() == coord.line)
{
for (auto& atom : line)
{
auto& content = atom.content;
if (content.has_buffer_range() and
coord >= content.begin() and coord < content.end())
{
res.column += utf8::distance(buffer().iterator_at(content.begin()),
buffer().iterator_at(coord));
return res;
}
res.column += content.length();
}
}
++res.line;
}
return { 0, 0 };
}
void Window::on_option_changed(const Option& option)
{
String desc = option.name() + "=" + option.get_as_string();
Context hook_context{*this};
m_hooks.run_hook("WinSetOption", desc, hook_context);
}
}
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