563 lines
15 KiB
C++
563 lines
15 KiB
C++
#include "buffer.hh"
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#include "assert.hh"
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#include "buffer_manager.hh"
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#include "client.hh"
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#include "context.hh"
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#include "file.hh"
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#include "interned_string.hh"
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#include "utils.hh"
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#include "window.hh"
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#include <algorithm>
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namespace Kakoune
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{
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Buffer::Buffer(String name, Flags flags, std::vector<String> lines,
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time_t fs_timestamp)
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: m_name(flags & Flags::File ? real_path(parse_filename(name)) : std::move(name)),
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m_flags(flags | Flags::NoUndo),
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m_history(), m_history_cursor(m_history.begin()),
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m_last_save_undo_index(0),
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m_fs_timestamp(fs_timestamp),
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m_hooks(GlobalHooks::instance()),
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m_options(GlobalOptions::instance()),
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m_keymaps(GlobalKeymaps::instance()),
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m_aliases(GlobalAliases::instance())
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{
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BufferManager::instance().register_buffer(*this);
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m_options.register_watcher(*this);
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if (lines.empty())
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lines.emplace_back("\n");
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m_lines.reserve(lines.size());
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for (auto& line : lines)
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{
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kak_assert(not line.empty() and line.back() == '\n');
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m_lines.emplace_back(std::move(line));
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}
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m_changes.push_back({ Change::Insert, {0,0}, line_count(), true });
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if (flags & Flags::File)
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{
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if (flags & Flags::New)
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run_hook_in_own_context("BufNew", m_name);
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else
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{
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kak_assert(m_fs_timestamp != InvalidTime);
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run_hook_in_own_context("BufOpen", m_name);
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}
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}
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run_hook_in_own_context("BufCreate", m_name);
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// now we may begin to record undo data
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m_flags = flags;
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for (auto& option : m_options.flatten_options())
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on_option_changed(*option);
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}
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Buffer::~Buffer()
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{
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run_hook_in_own_context("BufClose", m_name);
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m_options.unregister_watcher(*this);
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BufferManager::instance().unregister_buffer(*this);
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m_values.clear();
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}
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String Buffer::display_name() const
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{
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if (m_flags & Flags::File)
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return compact_path(m_name);
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return m_name;
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}
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bool Buffer::set_name(String name)
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{
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Buffer* other = BufferManager::instance().get_buffer_ifp(name);
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if (other == nullptr or other == this)
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{
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if (m_flags & Flags::File)
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m_name = real_path(name);
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else
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m_name = std::move(name);
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return true;
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}
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return false;
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}
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BufferIterator Buffer::iterator_at(ByteCoord coord) const
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{
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return is_end(coord) ? end() : BufferIterator(*this, clamp(coord));
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}
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ByteCoord Buffer::clamp(ByteCoord coord) const
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{
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if (m_lines.empty())
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return ByteCoord{};
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coord.line = Kakoune::clamp(coord.line, 0_line, line_count() - 1);
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ByteCount max_col = std::max(0_byte, m_lines[coord.line].length() - 1);
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coord.column = Kakoune::clamp(coord.column, 0_byte, max_col);
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return coord;
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}
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ByteCoord Buffer::offset_coord(ByteCoord coord, CharCount offset)
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{
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auto& line = m_lines[coord.line];
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auto character = std::max(0_char, std::min(line.char_count_to(coord.column) + offset,
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line.char_length() - 1));
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return {coord.line, line.byte_count_to(character)};
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}
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ByteCoordAndTarget Buffer::offset_coord(ByteCoordAndTarget coord, LineCount offset)
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{
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auto character = coord.target == -1 ? m_lines[coord.line].char_count_to(coord.column) : coord.target;
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auto line = Kakoune::clamp(coord.line + offset, 0_line, line_count()-1);
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auto& content = m_lines[line];
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character = std::max(0_char, std::min(character, content.char_length() - 2));
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return {line, content.byte_count_to(character), character};
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}
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String Buffer::string(ByteCoord begin, ByteCoord end) const
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{
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String res;
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for (auto line = begin.line; line <= end.line and line < line_count(); ++line)
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{
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ByteCount start = 0;
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if (line == begin.line)
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start = begin.column;
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ByteCount count = -1;
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if (line == end.line)
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count = end.column - start;
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res += m_lines[line].substr(start, count);
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}
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return res;
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}
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// A Modification holds a single atomic modification to Buffer
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struct Buffer::Modification
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{
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enum Type { Insert, Erase };
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Type type;
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ByteCoord coord;
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InternedString content;
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Modification(Type type, ByteCoord coord, InternedString content)
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: type(type), coord(coord), content(std::move(content)) {}
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Modification inverse() const
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{
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return {type == Insert ? Erase : Insert, coord, content};
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}
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};
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void Buffer::reload(std::vector<String> lines, time_t fs_timestamp)
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{
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m_changes.push_back({ Change::Erase, {0,0}, back_coord(), true });
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commit_undo_group();
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if (not (m_flags & Flags::NoUndo))
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{
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for (auto line = line_count()-1; line >= 0; --line)
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m_current_undo_group.emplace_back(
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Modification::Erase, line, m_lines[line]);
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}
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m_lines.clear();
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if (lines.empty())
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lines.emplace_back("\n");
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m_lines.reserve(lines.size());
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for (auto& line : lines)
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{
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kak_assert(not line.empty() and line.back() == '\n');
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m_lines.emplace_back(std::move(line));
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if (not (m_flags & Flags::NoUndo))
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m_current_undo_group.emplace_back(
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Modification::Insert, line_count()-1, m_lines.back());
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}
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commit_undo_group();
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m_fs_timestamp = fs_timestamp;
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m_changes.push_back({ Change::Insert, {0,0}, back_coord(), true });
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}
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void Buffer::commit_undo_group()
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{
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if (m_flags & Flags::NoUndo)
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return;
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if (m_current_undo_group.empty())
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return;
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m_history.erase(m_history_cursor, m_history.end());
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m_history.push_back(std::move(m_current_undo_group));
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m_current_undo_group.clear();
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m_history_cursor = m_history.end();
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if (m_history.size() < m_last_save_undo_index)
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m_last_save_undo_index = -1;
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}
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bool Buffer::undo()
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{
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commit_undo_group();
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if (m_history_cursor == m_history.begin())
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return false;
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--m_history_cursor;
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for (const Modification& modification : reversed(*m_history_cursor))
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apply_modification(modification.inverse());
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return true;
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}
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bool Buffer::redo()
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{
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if (m_history_cursor == m_history.end())
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return false;
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kak_assert(m_current_undo_group.empty());
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for (const Modification& modification : *m_history_cursor)
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apply_modification(modification);
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++m_history_cursor;
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return true;
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}
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void Buffer::check_invariant() const
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{
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#ifdef KAK_DEBUG
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kak_assert(not m_lines.empty());
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for (auto& line : m_lines)
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{
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kak_assert(line.length() > 0);
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kak_assert(line.back() == '\n');
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}
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#endif
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}
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ByteCoord Buffer::do_insert(ByteCoord pos, StringView content)
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{
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kak_assert(is_valid(pos));
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if (content.empty())
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return pos;
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ByteCoord begin;
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ByteCoord end;
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bool at_end = false;
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// if we inserted at the end of the buffer, we have created a new
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// line without inserting a '\n'
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if (is_end(pos))
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{
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ByteCount start = 0;
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for (ByteCount i = 0; i < content.length(); ++i)
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{
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if (content[i] == '\n')
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{
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m_lines.push_back(content.substr(start, i + 1 - start));
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start = i + 1;
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}
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}
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if (start != content.length())
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m_lines.push_back(content.substr(start));
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begin = pos.column == 0 ? pos : ByteCoord{ pos.line + 1, 0 };
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end = ByteCoord{ line_count(), 0 };
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at_end = true;
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}
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else
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{
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StringView prefix = m_lines[pos.line].substr(0, pos.column);
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StringView suffix = m_lines[pos.line].substr(pos.column);
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std::vector<InternedString> new_lines;
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ByteCount start = 0;
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for (ByteCount i = 0; i < content.length(); ++i)
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{
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if (content[i] == '\n')
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{
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StringView line_content = content.substr(start, i + 1 - start);
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if (start == 0)
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new_lines.emplace_back(prefix + line_content);
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else
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new_lines.push_back(line_content);
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start = i + 1;
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}
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}
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if (start == 0)
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new_lines.emplace_back(prefix + content + suffix);
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else if (start != content.length() or not suffix.empty())
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new_lines.emplace_back(content.substr(start) + suffix);
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LineCount last_line = pos.line + new_lines.size() - 1;
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auto line_it = m_lines.begin() + (int)pos.line;
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*line_it = std::move(*new_lines.begin());
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m_lines.insert(line_it+1, std::make_move_iterator(new_lines.begin() + 1),
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std::make_move_iterator(new_lines.end()));
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begin = pos;
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end = ByteCoord{ last_line, m_lines[last_line].length() - suffix.length() };
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}
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m_changes.push_back({ Change::Insert, begin, end, at_end });
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return begin;
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}
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ByteCoord Buffer::do_erase(ByteCoord begin, ByteCoord end)
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{
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kak_assert(is_valid(begin));
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kak_assert(is_valid(end));
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StringView prefix = m_lines[begin.line].substr(0, begin.column);
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StringView suffix = m_lines[end.line].substr(end.column);
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String new_line = prefix + suffix;
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ByteCoord next;
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if (new_line.length() != 0)
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{
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m_lines.erase(m_lines.begin() + (int)begin.line, m_lines.begin() + (int)end.line);
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m_lines[begin.line] = InternedString(new_line);
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next = begin;
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}
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else
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{
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m_lines.erase(m_lines.begin() + (int)begin.line, m_lines.begin() + (int)end.line + 1);
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next = is_end(begin) ? end_coord() : ByteCoord{begin.line, 0};
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}
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m_changes.push_back({ Change::Erase, begin, end, is_end(begin) });
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return next;
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}
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void Buffer::apply_modification(const Modification& modification)
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{
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StringView content = modification.content;
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ByteCoord coord = modification.coord;
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kak_assert(is_valid(coord));
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// in modifications, end coords should be {line_count(), 0}
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kak_assert((m_lines.empty() and coord == ByteCoord{0,0} ) or
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coord != ByteCoord(line_count()-1, m_lines.back().length()));
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switch (modification.type)
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{
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case Modification::Insert:
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{
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do_insert(coord, content);
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break;
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}
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case Modification::Erase:
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{
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ByteCount count = content.length();
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ByteCoord end = advance(coord, count);
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kak_assert(string(coord, end) == content);
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do_erase(coord, end);
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break;
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}
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default:
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kak_assert(false);
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}
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}
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BufferIterator Buffer::insert(const BufferIterator& pos, StringView content)
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{
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kak_assert(is_valid(pos.coord()));
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if (content.empty())
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return pos;
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InternedString real_content;
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if (pos == end() and content.back() != '\n')
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real_content = InternedString(content + "\n");
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else
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real_content = content;
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// for undo and redo purpose it is better to use one past last line rather
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// than one past last char coord.
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auto coord = pos == end() ? ByteCoord{line_count()} : pos.coord();
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if (not (m_flags & Flags::NoUndo))
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m_current_undo_group.emplace_back(Modification::Insert, coord, real_content);
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return {*this, do_insert(pos.coord(), real_content)};
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}
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BufferIterator Buffer::erase(BufferIterator begin, BufferIterator end)
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{
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// do not erase last \n except if we erase from the start of a line
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if (end == this->end() and (begin.coord().column != 0 or begin == this->begin()))
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--end;
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if (begin == end)
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return begin;
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if (not (m_flags & Flags::NoUndo))
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m_current_undo_group.emplace_back(Modification::Erase, begin.coord(),
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InternedString(string(begin.coord(), end.coord())));
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return {*this, do_erase(begin.coord(), end.coord())};
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}
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bool Buffer::is_modified() const
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{
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size_t history_cursor_index = m_history_cursor - m_history.begin();
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return m_last_save_undo_index != history_cursor_index
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or not m_current_undo_group.empty();
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}
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void Buffer::notify_saved()
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{
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if (not m_current_undo_group.empty())
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commit_undo_group();
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m_flags &= ~Flags::New;
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size_t history_cursor_index = m_history_cursor - m_history.begin();
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if (m_last_save_undo_index != history_cursor_index)
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m_last_save_undo_index = history_cursor_index;
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m_fs_timestamp = get_fs_timestamp(m_name);
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}
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ByteCoord Buffer::advance(ByteCoord coord, ByteCount count) const
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{
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if (count > 0)
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{
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auto line = coord.line;
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count += coord.column;
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while (count >= m_lines[line].length())
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{
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count -= m_lines[line++].length();
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if (line == line_count())
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return end_coord();
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}
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return { line, count };
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}
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else if (count < 0)
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{
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auto line = coord.line;
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count += coord.column;
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while (count < 0)
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{
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count += m_lines[--line].length();
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if (line < 0)
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return {0, 0};
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}
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return { line, count };
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}
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return coord;
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}
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ByteCoord Buffer::char_next(ByteCoord coord) const
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{
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if (coord.column < m_lines[coord.line].length() - 1)
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{
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auto line = m_lines[coord.line];
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coord.column += utf8::codepoint_size(line[coord.column]);
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// Handle invalid utf-8
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if (coord.column >= line.length())
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{
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++coord.line;
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coord.column = 0;
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}
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}
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else if (coord.line == m_lines.size() - 1)
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coord.column = m_lines.back().length();
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else
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{
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++coord.line;
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coord.column = 0;
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}
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return coord;
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}
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ByteCoord Buffer::char_prev(ByteCoord coord) const
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{
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kak_assert(is_valid(coord));
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if (is_end(coord))
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return coord = {(int)m_lines.size()-1, m_lines.back().length() - 1};
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else if (coord.column == 0)
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{
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if (coord.line > 0)
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coord.column = m_lines[--coord.line].length() - 1;
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}
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else
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{
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auto line = m_lines[coord.line];
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coord.column = (int)(utf8::character_start(line.begin() + (int)coord.column - 1, line.begin()) - line.begin());
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}
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return coord;
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}
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time_t Buffer::fs_timestamp() const
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{
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kak_assert(m_flags & Flags::File);
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return m_fs_timestamp;
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}
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void Buffer::set_fs_timestamp(time_t ts)
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{
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kak_assert(m_flags & Flags::File);
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m_fs_timestamp = ts;
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}
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void Buffer::on_option_changed(const Option& option)
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{
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run_hook_in_own_context("BufSetOption",
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option.name() + "=" + option.get_as_string());
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}
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void Buffer::run_hook_in_own_context(const String& hook_name, StringView param)
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{
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InputHandler hook_handler({ *this, Selection{} });
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m_hooks.run_hook(hook_name, param, hook_handler.context());
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}
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ByteCoord Buffer::last_modification_coord() const
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{
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if (m_history.empty())
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return {};
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return m_history.back().back().coord;
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}
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String Buffer::debug_description() const
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{
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String res = display_name() + "\n";
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res += " Flags: ";
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if (m_flags & Flags::File)
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res += "File (" + name() + ") ";
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if (m_flags & Flags::New)
|
|
res += "New ";
|
|
if (m_flags & Flags::Fifo)
|
|
res += "Fifo ";
|
|
if (m_flags & Flags::NoUndo)
|
|
res += "NoUndo ";
|
|
res += "\n";
|
|
|
|
size_t content_size = 0;
|
|
for (auto& line : m_lines)
|
|
content_size += (int)line.length();
|
|
|
|
size_t additional_size = 0;
|
|
for (auto& undo_group : m_history)
|
|
additional_size += undo_group.size() * sizeof(Modification);
|
|
additional_size += m_changes.size() * sizeof(Change);
|
|
|
|
res += " Used mem: content=" + to_string(content_size) +
|
|
" additional=" + to_string(additional_size) + "\n";
|
|
return res;
|
|
}
|
|
|
|
}
|