423 lines
12 KiB
C++
423 lines
12 KiB
C++
#include "buffer.hh"
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#include "buffer_manager.hh"
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#include "window.hh"
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#include "assert.hh"
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#include "utils.hh"
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#include "context.hh"
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#include "utf8.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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: m_name(std::move(name)), 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_timestamp(0),
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m_hooks(GlobalHooks::instance()),
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m_options(GlobalOptions::instance())
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{
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BufferManager::instance().register_buffer(*this);
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ByteCount pos = 0;
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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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assert(not line.empty() and line.back() == '\n');
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m_lines.emplace_back(Line{ pos, std::move(line) });
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pos += m_lines.back().length();
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}
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Editor editor_for_hooks(*this);
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Context context(editor_for_hooks);
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if (flags & Flags::File and flags & Flags::New)
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m_hooks.run_hook("BufNew", m_name, context);
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else
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m_hooks.run_hook("BufOpen", m_name, context);
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m_hooks.run_hook("BufCreate", m_name, context);
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// now we may begin to record undo data
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m_flags = flags;
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}
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Buffer::~Buffer()
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{
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m_hooks.run_hook("BufClose", m_name, Context(Editor(*this)));
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BufferManager::instance().unregister_buffer(*this);
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assert(m_change_listeners.empty());
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}
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BufferIterator Buffer::iterator_at(const BufferCoord& line_and_column,
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bool avoid_eol) const
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{
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return BufferIterator(*this, clamp(line_and_column, avoid_eol));
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}
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ByteCount Buffer::line_length(LineCount line) const
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{
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assert(line < line_count());
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ByteCount end = (line < line_count() - 1) ?
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m_lines[line + 1].start : character_count();
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return end - m_lines[line].start;
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}
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BufferCoord Buffer::clamp(const BufferCoord& line_and_column,
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bool avoid_eol) const
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{
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if (m_lines.empty())
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return BufferCoord();
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BufferCoord result(line_and_column.line, line_and_column.column);
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result.line = Kakoune::clamp(result.line, 0_line, line_count() - 1);
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ByteCount max_col = std::max(0_byte, line_length(result.line) - (avoid_eol ? 2 : 1));
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result.column = Kakoune::clamp(result.column, 0_byte, max_col);
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return result;
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}
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BufferIterator Buffer::iterator_at_line_begin(const BufferIterator& iterator) const
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{
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return BufferIterator(*this, { iterator.line(), 0 });
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}
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BufferIterator Buffer::iterator_at_line_begin(LineCount line) const
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{
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line = Kakoune::clamp(line, 0_line, line_count()-1);
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assert(line_length(line) > 0);
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return BufferIterator(*this, { line, 0 });
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}
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BufferIterator Buffer::iterator_at_line_end(const BufferIterator& iterator) const
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{
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LineCount line = iterator.line();
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assert(line_length(line) > 0);
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return ++BufferIterator(*this, { line, line_length(line) - 1 });
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}
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BufferIterator Buffer::iterator_at_line_end(LineCount line) const
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{
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line = Kakoune::clamp(line, 0_line, line_count()-1);
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assert(line_length(line) > 0);
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return ++BufferIterator(*this, { line, line_length(line) - 1 });
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}
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BufferIterator Buffer::begin() const
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{
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return BufferIterator(*this, { 0_line, 0 });
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}
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BufferIterator Buffer::end() const
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{
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if (m_lines.empty())
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return BufferIterator(*this, { 0_line, 0 });
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return BufferIterator(*this, { line_count()-1, m_lines.back().length() });
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}
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ByteCount Buffer::character_count() const
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{
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if (m_lines.empty())
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return 0;
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return m_lines.back().start + m_lines.back().length();
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}
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LineCount Buffer::line_count() const
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{
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return LineCount(m_lines.size());
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}
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String Buffer::string(const BufferIterator& begin, const BufferIterator& end) const
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{
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String res;
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for (LineCount line = begin.line(); line <= end.line(); ++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].content.substr(start, count);
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}
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return res;
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}
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void Buffer::begin_undo_group()
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{
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if (m_flags & Flags::NoUndo)
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return;
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assert(m_current_undo_group.empty());
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m_history.erase(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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m_history_cursor = m_history.end();
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}
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void Buffer::end_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.push_back(std::move(m_current_undo_group));
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m_history_cursor = m_history.end();
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m_current_undo_group.clear();
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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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BufferIterator position;
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String content;
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Modification(Type type, BufferIterator position, String content)
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: type(type), position(position), content(std::move(content)) {}
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Modification inverse() const
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{
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Type inverse_type;
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switch (type)
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{
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case Insert: inverse_type = Erase; break;
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case Erase: inverse_type = Insert; break;
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default: assert(false);
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}
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return Modification(inverse_type, position, content);
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}
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};
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bool Buffer::undo()
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{
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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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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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ByteCount start = 0;
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assert(not m_lines.empty());
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for (auto& line : m_lines)
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{
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assert(line.start == start);
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assert(line.length() > 0);
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assert(line.content.back() == '\n');
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start += line.length();
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}
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}
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void Buffer::do_insert(const BufferIterator& pos, const String& content)
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{
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assert(pos.is_end() or utf8::is_character_start(pos));
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++m_timestamp;
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ByteCount offset = pos.offset();
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// all following lines advanced by length
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for (LineCount i = pos.line()+1; i < line_count(); ++i)
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m_lines[i].start += content.length();
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BufferIterator begin_it;
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BufferIterator end_it;
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// if we inserted at the end of the buffer, we may have created a new
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// line without inserting a '\n'
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if (pos == end() and (pos == begin() or *(pos-1) == '\n'))
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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({ offset + start, 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({ offset + start, content.substr(start) });
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begin_it = pos;
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end_it = end();
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}
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else
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{
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String prefix = m_lines[pos.line()].content.substr(0, pos.column());
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String suffix = m_lines[pos.line()].content.substr(pos.column());
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auto line_it = m_lines.begin() + (int)pos.line();
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line_it = m_lines.erase(line_it);
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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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String line_content = content.substr(start, i + 1 - start);
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if (start == 0)
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{
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line_content = prefix + line_content;
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line_it = m_lines.insert(line_it, { offset + start - prefix.length(),
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std::move(line_content) });
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}
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else
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line_it = m_lines.insert(line_it, { offset + start,
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std::move(line_content) });
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++line_it;
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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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line_it = m_lines.insert(line_it, { offset + start - prefix.length(), prefix + content + suffix });
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else if (start != content.length() or not suffix.empty())
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line_it = m_lines.insert(line_it, { offset + start, content.substr(start) + suffix });
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else
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--line_it;
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begin_it = pos;
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end_it = BufferIterator(*this, { LineCount(line_it - m_lines.begin()),
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line_it->length() - suffix.length() });
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}
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check_invariant();
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for (auto listener : m_change_listeners)
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listener->on_insert(begin_it, end_it);
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}
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void Buffer::do_erase(const BufferIterator& begin, const BufferIterator& end)
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{
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assert(utf8::is_character_start(begin) and
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(end.is_end() or utf8::is_character_start(end)));
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++m_timestamp;
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const ByteCount length = end - begin;
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String prefix = m_lines[begin.line()].content.substr(0, begin.column());
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String suffix = m_lines[end.line()].content.substr(end.column());
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Line new_line = { m_lines[begin.line()].start, prefix + suffix };
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m_lines.erase(m_lines.begin() + (int)begin.line(), m_lines.begin() + (int)end.line() + 1);
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if (new_line.length() != 0)
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m_lines.insert(m_lines.begin() + (int)begin.line(), std::move(new_line));
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for (LineCount i = begin.line()+1; i < line_count(); ++i)
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m_lines[i].start -= length;
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check_invariant();
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for (auto listener : m_change_listeners)
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listener->on_erase(begin, end);
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}
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void Buffer::apply_modification(const Modification& modification)
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{
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const String& content = modification.content;
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const BufferIterator& pos = modification.position;
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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(pos < end() ? pos : end(), 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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BufferIterator end = pos + count;
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assert(string(pos, end) == content);
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do_erase(pos, end);
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break;
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}
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default:
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assert(false);
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}
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}
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void Buffer::insert(BufferIterator pos, String content)
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{
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if (content.empty())
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return;
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if (pos.is_end() and content.back() != '\n')
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content += '\n';
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if (not (m_flags & Flags::NoUndo))
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m_current_undo_group.emplace_back(Modification::Insert, pos, content);
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do_insert(pos, content);
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}
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void Buffer::erase(BufferIterator begin, BufferIterator end)
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{
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if (end.is_end() and (begin.column() != 0 or begin.is_begin()))
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--end;
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if (begin == end)
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return;
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if (not (m_flags & Flags::NoUndo))
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m_current_undo_group.emplace_back(Modification::Erase, begin,
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string(begin, end));
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do_erase(begin, end);
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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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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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{
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++m_timestamp;
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m_last_save_undo_index = history_cursor_index;
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}
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}
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void Buffer::add_change_listener(BufferChangeListener& listener) const
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{
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assert(not contains(m_change_listeners, &listener));
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m_change_listeners.push_back(&listener);
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}
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void Buffer::remove_change_listener(BufferChangeListener& listener) const
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{
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auto it = std::find(m_change_listeners.begin(),
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m_change_listeners.end(),
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&listener);
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assert(it != m_change_listeners.end());
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m_change_listeners.erase(it);
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}
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}
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