kakoune/src/window.cc

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#include "window.hh"
#include "assert.hh"
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#include "context.hh"
#include "highlighter.hh"
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#include "hook_manager.hh"
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#include "client.hh"
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#include <algorithm>
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#include <sstream>
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namespace Kakoune
{
// Implementation in highlighters.cc
void highlight_selections(const Context& context, HighlightFlags flags, DisplayBuffer& display_buffer, BufferRange range);
void expand_tabulations(const Context& context, HighlightFlags flags, DisplayBuffer& display_buffer, BufferRange range);
void expand_unprintable(const Context& context, HighlightFlags flags, DisplayBuffer& display_buffer, BufferRange range);
Window::Window(Buffer& buffer)
: Scope(buffer),
m_buffer(&buffer)
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{
run_hook_in_own_context("WinCreate", buffer.name());
options().register_watcher(*this);
m_builtin_highlighters.add_child({"tabulations"_str, make_simple_highlighter(expand_tabulations)});
m_builtin_highlighters.add_child({"unprintable"_str, make_simple_highlighter(expand_unprintable)});
m_builtin_highlighters.add_child({"selections"_str, make_simple_highlighter(highlight_selections)});
for (auto& option : options().flatten_options())
on_option_changed(*option);
}
Window::~Window()
{
run_hook_in_own_context("WinClose", buffer().name());
options().unregister_watcher(*this);
}
void Window::display_line_at(LineCount buffer_line, LineCount display_line)
{
if (display_line >= 0 or display_line < m_dimensions.line)
m_position.line = std::max(0_line, buffer_line - display_line);
}
void Window::center_line(LineCount buffer_line)
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{
display_line_at(buffer_line, m_dimensions.line/2_line);
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}
void Window::scroll(LineCount offset)
{
m_position.line = std::max(0_line, m_position.line + offset);
}
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void Window::scroll(CharCount offset)
{
m_position.column = std::max(0_char, m_position.column + offset);
}
void Window::update_display_buffer(const Context& context)
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{
kak_assert(&buffer() == &context.buffer());
scroll_to_keep_selection_visible_ifn(context);
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DisplayBuffer::LineList& lines = m_display_buffer.lines();
lines.clear();
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for (LineCount line = 0; line < m_dimensions.line; ++line)
{
LineCount buffer_line = m_position.line + line;
if (buffer_line >= buffer().line_count())
break;
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lines.emplace_back(AtomList{ {buffer(), buffer_line, buffer_line+1} });
}
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m_display_buffer.compute_range();
BufferRange range{{0,0}, buffer().end_coord()};
m_highlighters.highlight(context, HighlightFlags::Highlight, m_display_buffer, range);
m_builtin_highlighters.highlight(context, HighlightFlags::Highlight, m_display_buffer, range);
// cut the start of the line before m_position.column
for (auto& line : lines)
line.trim(m_position.column, m_dimensions.column);
m_display_buffer.optimize();
m_timestamp = buffer().timestamp();
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}
void Window::set_position(CharCoord position)
{
m_position.line = std::max(0_line, position.line);
m_position.column = std::max(0_char, position.column);
}
void Window::set_dimensions(CharCoord dimensions)
{
m_dimensions = dimensions;
}
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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;
}
static CharCount adapt_view_pos(const DisplayBuffer& display_buffer, CharCount offset,
ByteCoord pos, CharCount view_pos, CharCount view_size)
{
CharCount buffer_column = 0;
CharCount non_buffer_column = 0;
for (auto& line : display_buffer.lines())
{
for (auto& atom : line)
{
if (atom.has_buffer_range())
{
if (atom.begin() <= pos and atom.end() > pos)
{
CharCount pos_beg, pos_end;
if (atom.type() == DisplayAtom::BufferRange)
{
auto& buf = atom.buffer();
pos_beg = buffer_column
+ utf8::distance(buf.iterator_at(atom.begin()),
buf.iterator_at(pos));
pos_end = pos_beg+1;
}
else
{
pos_beg = buffer_column;
pos_end = pos_beg + atom.length();
}
if (pos_beg - offset < view_pos)
return std::max(0_char, pos_beg - offset);
if (pos_end + offset >= view_pos + view_size - non_buffer_column)
return pos_end + offset - view_size + non_buffer_column;
}
buffer_column += atom.length();
}
else
non_buffer_column += atom.length();
}
}
return view_pos;
}
void Window::scroll_to_keep_selection_visible_ifn(const Context& context)
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{
auto& selection = context.selections().main();
const auto& anchor = selection.anchor();
const auto& cursor = selection.cursor();
const CharCoord max_offset{(m_dimensions.line - 1)/2,
(m_dimensions.column - 1)/2};
const CharCoord offset = std::min(options()["scrolloff"].get<CharCoord>(),
max_offset);
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// scroll lines if needed, try to get as much of the selection visible as possible
m_position.line = adapt_view_pos(anchor.line, offset.line, m_position.line,
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m_dimensions.line, buffer().line_count());
m_position.line = adapt_view_pos(cursor.line, offset.line, m_position.line,
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m_dimensions.line, buffer().line_count());
// highlight only the line containing the cursor
DisplayBuffer display_buffer;
DisplayBuffer::LineList& lines = display_buffer.lines();
lines.emplace_back(AtomList{ {buffer(), cursor.line, cursor.line+1} });
display_buffer.compute_range();
BufferRange range{cursor.line, cursor.line + 1};
m_highlighters.highlight(context, HighlightFlags::MoveOnly, display_buffer, range);
m_builtin_highlighters.highlight(context, HighlightFlags::MoveOnly, display_buffer, range);
// 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)
m_position.column = adapt_view_pos(display_buffer, offset.column,
anchor.line == cursor.line ? anchor : cursor.line,
m_position.column, m_dimensions.column);
m_position.column = adapt_view_pos(display_buffer, offset.column, cursor,
m_position.column, m_dimensions.column);
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}
namespace
{
CharCount find_display_column(const DisplayLine& line, const Buffer& buffer,
ByteCoord coord)
{
CharCount column = 0;
for (auto& atom : line)
{
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if (atom.has_buffer_range() and
coord >= atom.begin() and coord < atom.end())
{
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if (atom.type() == DisplayAtom::BufferRange)
column += utf8::distance(buffer.iterator_at(atom.begin()),
buffer.iterator_at(coord));
return column;
}
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column += atom.length();
}
return column;
}
ByteCoord find_buffer_coord(const DisplayLine& line, const Buffer& buffer,
CharCount column)
{
auto& range = line.range();
for (auto& atom : line)
{
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CharCount len = atom.length();
if (atom.has_buffer_range() and column < len)
{
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if (atom.type() == DisplayAtom::BufferRange)
return utf8::advance(buffer.iterator_at(atom.begin()), buffer.iterator_at(range.second),
std::max(0_char, column)).coord();
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return atom.begin();
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}
column -= len;
}
return buffer.clamp(buffer.prev(range.second));
}
}
CharCoord Window::display_position(ByteCoord coord) const
{
LineCount l = 0;
for (auto& line : m_display_buffer.lines())
{
auto& range = line.range();
if (range.first <= coord and coord < range.second)
return {l, find_display_column(line, buffer(), coord)};
++l;
}
return { 0, 0 };
}
ByteCoord Window::buffer_coord(CharCoord coord) const
{
if (coord <= 0_line)
coord = {0,0};
if ((int)coord.line >= m_display_buffer.lines().size())
coord = CharCoord{(int)m_display_buffer.lines().size()-1, INT_MAX};
return find_buffer_coord(m_display_buffer.lines()[(int)coord.line],
buffer(), coord.column);
}
ByteCoord Window::offset_coord(ByteCoord coord, CharCount offset)
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{
return buffer().offset_coord(coord, offset);
}
ByteCoordAndTarget Window::offset_coord(ByteCoordAndTarget coord, LineCount offset)
{
auto line = clamp(coord.line + offset, 0_line, buffer().line_count()-1);
DisplayBuffer display_buffer;
DisplayBuffer::LineList& lines = display_buffer.lines();
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lines.emplace_back(AtomList{ {buffer(), coord.line, coord.line+1} });
lines.emplace_back(AtomList{ {buffer(), line, line+1} });
display_buffer.compute_range();
BufferRange range{ std::min(line, coord.line), std::max(line,coord.line)+1};
InputHandler input_handler{{ *m_buffer, Selection{} }, Context::Flags::Transient};
input_handler.context().set_window(*this);
m_highlighters.highlight(input_handler.context(), HighlightFlags::MoveOnly, display_buffer, range);
m_builtin_highlighters.highlight(input_handler.context(), HighlightFlags::MoveOnly, display_buffer, range);
CharCount column = coord.target == -1 ? find_display_column(lines[0], buffer(), coord) : coord.target;
return { find_buffer_coord(lines[1], buffer(), column), column };
}
void Window::on_option_changed(const Option& option)
{
String desc = option.name() + "=" + option.get_as_string();
run_hook_in_own_context("WinSetOption", desc);
// an highlighter might depend on the option, so we need to redraw
forget_timestamp();
}
void Window::run_hook_in_own_context(StringView hook_name, StringView param)
{
InputHandler hook_handler({ *m_buffer, Selection{} }, Context::Flags::Transient);
hook_handler.context().set_window(*this);
hooks().run_hook(hook_name, param, hook_handler.context());
}
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}