331 lines
11 KiB
C++
331 lines
11 KiB
C++
#include "window.hh"
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#include "assert.hh"
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#include "context.hh"
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#include "highlighter.hh"
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#include "hook_manager.hh"
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#include "input_handler.hh"
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#include "user_interface.hh"
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#include <algorithm>
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#include <sstream>
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namespace Kakoune
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{
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// Implementation in highlighters.cc
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void highlight_selections(const Context& context, HighlightFlags flags, DisplayBuffer& display_buffer, BufferRange range);
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void expand_tabulations(const Context& context, HighlightFlags flags, DisplayBuffer& display_buffer, BufferRange range);
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void expand_unprintable(const Context& context, HighlightFlags flags, DisplayBuffer& display_buffer, BufferRange range);
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Window::Window(Buffer& buffer)
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: Scope(buffer),
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m_buffer(&buffer)
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{
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run_hook_in_own_context("WinCreate", buffer.name());
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options().register_watcher(*this);
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m_builtin_highlighters.add_child({"tabulations"_str, make_simple_highlighter(expand_tabulations)});
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m_builtin_highlighters.add_child({"unprintable"_str, make_simple_highlighter(expand_unprintable)});
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m_builtin_highlighters.add_child({"selections"_str, make_simple_highlighter(highlight_selections)});
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for (auto& option : options().flatten_options())
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on_option_changed(*option);
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}
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Window::~Window()
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{
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run_hook_in_own_context("WinClose", buffer().name());
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options().unregister_watcher(*this);
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}
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void Window::display_line_at(LineCount buffer_line, LineCount display_line)
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{
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if (display_line >= 0 or display_line < m_dimensions.line)
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m_position.line = std::max(0_line, buffer_line - display_line);
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}
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void Window::center_line(LineCount buffer_line)
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{
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display_line_at(buffer_line, m_dimensions.line/2_line);
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}
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void Window::scroll(LineCount offset)
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{
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m_position.line = std::max(0_line, m_position.line + offset);
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}
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void Window::scroll(CharCount offset)
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{
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m_position.column = std::max(0_char, m_position.column + offset);
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}
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size_t Window::compute_hash(const Context& context) const
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{
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size_t res = hash_values(m_position, context.ui().dimensions(), context.buffer().timestamp());
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auto& selections = context.selections();
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res = combine_hash(res, hash_value(selections.main_index()));
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for (auto& sel : selections)
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res = combine_hash(res, hash_values((const ByteCoord&)sel.cursor(), sel.anchor()));
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return res;
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}
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bool Window::needs_redraw(const Context& context) const
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{
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size_t hash = compute_hash(context);
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return hash != m_hash;
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}
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const DisplayBuffer& Window::update_display_buffer(const Context& context)
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{
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DisplayBuffer::LineList& lines = m_display_buffer.lines();
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lines.clear();
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m_dimensions = context.ui().dimensions();
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if (m_dimensions == CharCoord{0,0})
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return m_display_buffer;
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kak_assert(&buffer() == &context.buffer());
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scroll_to_keep_selection_visible_ifn(context);
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for (LineCount line = 0; line < m_dimensions.line; ++line)
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{
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LineCount buffer_line = m_position.line + line;
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if (buffer_line >= buffer().line_count())
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break;
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lines.emplace_back(AtomList{ {buffer(), buffer_line, buffer_line+1} });
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}
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m_display_buffer.compute_range();
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BufferRange range{{0,0}, buffer().end_coord()};
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m_highlighters.highlight(context, HighlightFlags::Highlight, m_display_buffer, range);
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m_builtin_highlighters.highlight(context, HighlightFlags::Highlight, m_display_buffer, range);
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// cut the start of the line before m_position.column
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for (auto& line : lines)
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line.trim(m_position.column, m_dimensions.column, true);
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m_display_buffer.optimize();
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m_hash = compute_hash(context);
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return m_display_buffer;
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}
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void Window::set_position(CharCoord position)
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{
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m_position.line = std::max(0_line, position.line);
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m_position.column = std::max(0_char, position.column);
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}
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void Window::set_dimensions(CharCoord dimensions)
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{
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m_dimensions = dimensions;
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}
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static LineCount adapt_view_pos(LineCount line, LineCount offset,
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LineCount view_pos, LineCount view_size,
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LineCount buffer_size)
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{
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offset = std::min(offset, (view_size + 1) / 2);
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if (line - offset < view_pos)
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return std::max(0_line, line - offset);
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else if (line + offset >= view_pos + view_size)
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return std::max(0_line, line + offset - view_size);
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return view_pos;
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}
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static CharCount adapt_view_pos(const DisplayBuffer& display_buffer, CharCount offset,
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ByteCoord pos, CharCount view_pos, CharCount view_size)
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{
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offset = std::min(offset, (view_size + 1) / 2);
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CharCount buffer_column = 0;
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CharCount non_buffer_column = 0;
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for (auto& line : display_buffer.lines())
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{
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for (auto& atom : line)
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{
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if (atom.has_buffer_range())
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{
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if (atom.begin() <= pos and atom.end() > pos)
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{
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CharCount pos_beg, pos_end;
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if (atom.type() == DisplayAtom::BufferRange)
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{
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auto& buf = atom.buffer();
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pos_beg = buffer_column
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+ utf8::distance(buf.iterator_at(atom.begin()),
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buf.iterator_at(pos));
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pos_end = pos_beg+1;
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}
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else
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{
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pos_beg = buffer_column;
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pos_end = pos_beg + atom.length();
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}
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if (pos_beg - offset < view_pos)
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return std::max(0_char, pos_beg - offset);
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if (pos_end + offset >= view_pos + view_size - non_buffer_column)
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return pos_end + offset - view_size + non_buffer_column;
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}
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buffer_column += atom.length();
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}
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else
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non_buffer_column += atom.length();
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}
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}
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return view_pos;
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}
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void Window::scroll_to_keep_selection_visible_ifn(const Context& context)
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{
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auto& selection = context.selections().main();
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const auto& anchor = selection.anchor();
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const auto& cursor = selection.cursor();
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const CharCoord offset = options()["scrolloff"].get<CharCoord>();
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// scroll lines if needed, try to get as much of the selection visible as possible
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m_position.line = adapt_view_pos(anchor.line, offset.line, m_position.line,
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m_dimensions.line, buffer().line_count());
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m_position.line = adapt_view_pos(cursor.line, offset.line, m_position.line,
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m_dimensions.line, buffer().line_count());
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// highlight only the line containing the cursor
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DisplayBuffer display_buffer;
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DisplayBuffer::LineList& lines = display_buffer.lines();
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lines.emplace_back(AtomList{ {buffer(), cursor.line, cursor.line+1} });
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display_buffer.compute_range();
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BufferRange range{cursor.line, cursor.line + 1};
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m_highlighters.highlight(context, HighlightFlags::MoveOnly, display_buffer, range);
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m_builtin_highlighters.highlight(context, HighlightFlags::MoveOnly, display_buffer, range);
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// now we can compute where the cursor is in display columns
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// (this is only valid if highlighting one line and multiple lines put
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// the cursor in the same position, however I do not find any sane example
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// of highlighters not doing that)
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m_position.column = adapt_view_pos(display_buffer, offset.column,
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anchor.line == cursor.line ? anchor : cursor.line,
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m_position.column, m_dimensions.column);
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m_position.column = adapt_view_pos(display_buffer, offset.column, cursor,
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m_position.column, m_dimensions.column);
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}
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namespace
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{
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CharCount find_display_column(const DisplayLine& line, const Buffer& buffer,
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ByteCoord coord)
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{
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CharCount column = 0;
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for (auto& atom : line)
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{
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if (atom.has_buffer_range() and
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coord >= atom.begin() and coord < atom.end())
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{
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if (atom.type() == DisplayAtom::BufferRange)
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column += utf8::distance(buffer.iterator_at(atom.begin()),
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buffer.iterator_at(coord));
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return column;
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}
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column += atom.length();
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}
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return column;
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}
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ByteCoord find_buffer_coord(const DisplayLine& line, const Buffer& buffer,
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CharCount column)
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{
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auto& range = line.range();
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for (auto& atom : line)
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{
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CharCount len = atom.length();
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if (atom.has_buffer_range() and column < len)
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{
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if (atom.type() == DisplayAtom::BufferRange)
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return utf8::advance(buffer.iterator_at(atom.begin()), buffer.iterator_at(range.end),
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std::max(0_char, column)).coord();
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return atom.begin();
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}
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column -= len;
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}
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return buffer.clamp(buffer.prev(range.end));
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}
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}
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CharCoord Window::display_position(ByteCoord coord) const
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{
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LineCount l = 0;
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for (auto& line : m_display_buffer.lines())
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{
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auto& range = line.range();
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if (range.begin <= coord and coord < range.end)
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return {l, find_display_column(line, buffer(), coord)};
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++l;
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}
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return { 0, 0 };
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}
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ByteCoord Window::buffer_coord(CharCoord coord) const
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{
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if (coord <= 0_line)
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coord = {0,0};
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if ((int)coord.line >= m_display_buffer.lines().size())
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coord = CharCoord{(int)m_display_buffer.lines().size()-1, INT_MAX};
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return find_buffer_coord(m_display_buffer.lines()[(int)coord.line],
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buffer(), coord.column);
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}
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ByteCoord Window::offset_coord(ByteCoord coord, CharCount offset)
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{
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return buffer().offset_coord(coord, offset);
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}
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ByteCoordAndTarget Window::offset_coord(ByteCoordAndTarget coord, LineCount offset)
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{
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auto line = clamp(coord.line + offset, 0_line, buffer().line_count()-1);
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DisplayBuffer display_buffer;
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DisplayBuffer::LineList& lines = display_buffer.lines();
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lines.emplace_back(AtomList{ {buffer(), coord.line, coord.line+1} });
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lines.emplace_back(AtomList{ {buffer(), line, line+1} });
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display_buffer.compute_range();
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BufferRange range{ std::min(line, coord.line), std::max(line,coord.line)+1};
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InputHandler input_handler{{ *m_buffer, Selection{} }, Context::Flags::Transient};
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input_handler.context().set_window(*this);
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m_highlighters.highlight(input_handler.context(), HighlightFlags::MoveOnly, display_buffer, range);
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m_builtin_highlighters.highlight(input_handler.context(), HighlightFlags::MoveOnly, display_buffer, range);
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CharCount column = coord.target == -1 ? find_display_column(lines[0], buffer(), coord) : coord.target;
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return { find_buffer_coord(lines[1], buffer(), column), column };
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}
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void Window::clear_display_buffer()
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{
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m_display_buffer = DisplayBuffer{};
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}
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void Window::on_option_changed(const Option& option)
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{
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run_hook_in_own_context("WinSetOption",
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format("{}={}", option.name(), option.get_as_string()));
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// an highlighter might depend on the option, so we need to redraw
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force_redraw();
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}
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void Window::run_hook_in_own_context(StringView hook_name, StringView param)
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{
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InputHandler hook_handler({ *m_buffer, Selection{} }, Context::Flags::Transient);
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hook_handler.context().set_window(*this);
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hooks().run_hook(hook_name, param, hook_handler.context());
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}
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}
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