kakoune/src/window.cc

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#include "window.hh"
#include "assert.hh"
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#include "filters.hh"
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#include <algorithm>
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#include <sstream>
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namespace Kakoune
{
BufferIterator Selection::begin() const
{
return std::min(m_first, m_last);
}
BufferIterator Selection::end() const
{
return std::max(m_first, m_last) + 1;
}
void Selection::offset(int offset)
{
m_first += offset;
m_last += offset;
}
struct scoped_undo_group
{
scoped_undo_group(Buffer& buffer)
: m_buffer(buffer) { m_buffer.begin_undo_group(); }
~scoped_undo_group() { m_buffer.end_undo_group(); }
private:
Buffer& m_buffer;
};
class HighlightSelections
{
public:
HighlightSelections(Window& window)
: m_window(window)
{
}
void operator()(DisplayBuffer& display_buffer)
{
SelectionList sorted_selections = m_window.m_selections;
std::sort(sorted_selections.begin(), sorted_selections.end(),
[](const Selection& lhs, const Selection& rhs) { return lhs.begin() < rhs.begin(); });
auto atom_it = display_buffer.begin();
auto sel_it = sorted_selections.begin();
while (atom_it != display_buffer.end()
and sel_it != sorted_selections.end())
{
Selection& sel = *sel_it;
DisplayAtom& atom = *atom_it;
// [###------]
if (atom.begin >= sel.begin() and atom.begin < sel.end() and atom.end > sel.end())
{
size_t length = sel.end() - atom.begin;
atom_it = display_buffer.split(atom_it, length);
atom_it->attribute |= Attributes::Underline;
++atom_it;
++sel_it;
}
// [---###---]
else if (atom.begin < sel.begin() and atom.end > sel.end())
{
size_t prefix_length = sel.begin() - atom.begin;
atom_it = display_buffer.split(atom_it, prefix_length);
size_t sel_length = sel.end() - sel.begin();
atom_it = display_buffer.split(atom_it + 1, sel_length);
atom_it->attribute |= Attributes::Underline;
++atom_it;
++sel_it;
}
// [------###]
else if (atom.begin < sel.begin() and atom.end > sel.begin())
{
size_t length = sel.begin() - atom.begin;
atom_it = display_buffer.split(atom_it, length) + 1;
atom_it->attribute |= Attributes::Underline;
++atom_it;
}
// [#########]
else if (atom.begin >= sel.begin() and atom.end <= sel.end())
{
atom_it->attribute |= Attributes::Underline;
++atom_it;
}
// [---------]
else if (atom.begin >= sel.end())
++sel_it;
// [---------]
else if (atom.end <= sel.begin())
++atom_it;
else
assert(false);
}
}
private:
const Window& m_window;
};
Window::Window(Buffer& buffer)
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: m_buffer(buffer),
m_position(0, 0),
m_dimensions(0, 0),
m_select_mode(SelectMode::Normal),
m_current_inserter(nullptr)
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{
m_selections.push_back(Selection(buffer.begin(), buffer.begin()));
m_filters.push_back(colorize_cplusplus);
m_filters.push_back(HighlightSelections(*this));
}
void Window::check_invariant() const
{
assert(not m_selections.empty());
}
WindowCoord Window::cursor_position() const
{
check_invariant();
return line_and_column_at(m_selections.back().last());
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}
void Window::erase()
{
scoped_undo_group undo_group(m_buffer);
erase_noundo();
}
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void Window::erase_noundo()
{
check_invariant();
for (auto& sel : m_selections)
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{
m_buffer.erase(sel.begin(), sel.end());
sel = Selection(sel.begin(), sel.begin());
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}
}
static WindowCoord measure_string(const Window::String& string)
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{
WindowCoord result(0, 0);
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for (size_t i = 0; i < string.length(); ++i)
{
if (string[i] == '\n')
{
++result.line;
result.column = 0;
}
else
++result.column;
}
return result;
}
void Window::insert(const String& string)
{
scoped_undo_group undo_group(m_buffer);
insert_noundo(string);
}
void Window::insert_noundo(const String& string)
{
for (auto& sel : m_selections)
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{
m_buffer.insert(sel.begin(), string);
sel.offset(string.length());
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}
}
void Window::append(const String& string)
{
scoped_undo_group undo_group(m_buffer);
append_noundo(string);
}
void Window::append_noundo(const String& string)
{
for (auto& sel : m_selections)
m_buffer.insert(sel.end(), string);
}
bool Window::undo()
{
return m_buffer.undo();
}
bool Window::redo()
{
return m_buffer.redo();
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}
BufferCoord Window::window_to_buffer(const WindowCoord& window_pos) const
{
return BufferCoord(m_position.line + window_pos.line,
m_position.column + window_pos.column);
}
WindowCoord Window::buffer_to_window(const BufferCoord& buffer_pos) const
{
return WindowCoord(buffer_pos.line - m_position.line,
buffer_pos.column - m_position.column);
}
BufferIterator Window::iterator_at(const WindowCoord& window_pos) const
{
return m_buffer.iterator_at(window_to_buffer(window_pos));
}
WindowCoord Window::line_and_column_at(const BufferIterator& iterator) const
{
return buffer_to_window(m_buffer.line_and_column_at(iterator));
}
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void Window::empty_selections()
{
check_invariant();
Selection sel = Selection(m_selections.back().last(),
m_selections.back().last());
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m_selections.clear();
m_selections.push_back(std::move(sel));
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}
void Window::select(const Selector& selector)
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{
check_invariant();
if (m_select_mode == SelectMode::Normal)
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{
Selection sel = selector(m_selections.back().last());
m_selections.clear();
m_selections.push_back(std::move(sel));
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}
else
{
for (auto& sel : m_selections)
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{
sel = Selection(sel.first(), selector(sel.last()).last());
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}
}
scroll_to_keep_cursor_visible_ifn();
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}
BufferString Window::selection_content() const
{
check_invariant();
return m_buffer.string(m_selections.back().begin(),
m_selections.back().end());
}
void Window::move_cursor(const WindowCoord& offset)
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{
if (m_select_mode == SelectMode::Normal)
move_cursor_to(cursor_position() + offset);
else
{
for (auto& sel : m_selections)
{
WindowCoord pos = line_and_column_at(sel.last());
sel = Selection(sel.first(), iterator_at(pos + offset));
}
scroll_to_keep_cursor_visible_ifn();
}
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}
void Window::move_cursor_to(const WindowCoord& new_pos)
{
BufferIterator target = iterator_at(new_pos);
m_selections.clear();
m_selections.push_back(Selection(target, target));
scroll_to_keep_cursor_visible_ifn();
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}
void Window::update_display_buffer()
{
m_display_buffer.clear();
BufferIterator begin = m_buffer.iterator_at(m_position);
BufferIterator end = m_buffer.iterator_at(m_position +
BufferCoord(m_dimensions.line, m_dimensions.column+1));
m_display_buffer.append(DisplayAtom(begin, end, m_buffer.string(begin, end)));
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for (auto& filter : m_filters)
{
filter(m_display_buffer);
m_display_buffer.check_invariant();
}
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}
void Window::set_dimensions(const WindowCoord& dimensions)
{
m_dimensions = dimensions;
}
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void Window::scroll_to_keep_cursor_visible_ifn()
{
check_invariant();
WindowCoord cursor = line_and_column_at(m_selections.back().last());
if (cursor.line < 0)
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{
m_position.line = std::max(m_position.line + cursor.line, 0);
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}
else if (cursor.line >= m_dimensions.line)
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{
m_position.line += cursor.line - (m_dimensions.line - 1);
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}
if (cursor.column < 0)
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{
m_position.column = std::max(m_position.column + cursor.column, 0);
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}
else if (cursor.column >= m_dimensions.column)
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{
m_position.column += cursor.column - (m_dimensions.column - 1);
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}
}
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std::string Window::status_line() const
{
BufferCoord cursor = window_to_buffer(cursor_position());
std::ostringstream oss;
oss << m_buffer.name() << " -- " << cursor.line << "," << cursor.column
<< " -- " << m_selections.size() << " sel -- ";
switch (m_select_mode)
{
case SelectMode::Normal:
oss << "[Normal]";
break;
case SelectMode::Append:
oss << "[Append]";
break;
default:
assert(false);
}
return oss.str();
}
IncrementalInserter::IncrementalInserter(Window& window, Mode mode)
: m_window(window)
{
assert(not m_window.m_current_inserter);
m_window.m_current_inserter = this;
m_window.check_invariant();
m_window.m_buffer.begin_undo_group();
if (mode == Mode::Change)
window.erase_noundo();
for (auto& sel : m_window.m_selections)
{
const BufferIterator& pos = mode == Mode::Append ? sel.end() : sel.begin();
sel = Selection(pos, pos);
}
}
IncrementalInserter::~IncrementalInserter()
{
assert(m_window.m_current_inserter == this);
m_window.m_current_inserter = nullptr;
m_window.m_buffer.end_undo_group();
}
void IncrementalInserter::insert(const Window::String& string)
{
m_window.insert_noundo(string);
}
void IncrementalInserter::erase()
{
move_cursor(WindowCoord(0, -1));
m_window.erase_noundo();
}
void IncrementalInserter::move_cursor(const WindowCoord& offset)
{
for (auto& sel : m_window.m_selections)
{
WindowCoord pos = m_window.line_and_column_at(sel.last());
BufferIterator it = m_window.iterator_at(pos + offset);
sel = Selection(it, it);
}
}
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}