429 lines
12 KiB
C++
429 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 <algorithm>
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namespace Kakoune
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{
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template<typename T>
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T clamp(T min, T max, T val)
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{
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if (val < min)
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return min;
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if (val > max)
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return max;
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return val;
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}
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Buffer::Buffer(String name, Type type,
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String initial_content)
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: m_name(std::move(name)), m_type(type),
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m_history(1), 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_hook_manager(GlobalHookManager::instance()),
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m_option_manager(GlobalOptionManager::instance())
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{
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BufferManager::instance().register_buffer(*this);
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if (initial_content.back() != '\n')
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initial_content += '\n';
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do_insert(begin(), std::move(initial_content));
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Editor editor_for_hooks(*this);
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Context context(editor_for_hooks);
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if (type == Type::NewFile)
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m_hook_manager.run_hook("BufNew", m_name, context);
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else if (type == Type::File)
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m_hook_manager.run_hook("BufOpen", m_name, context);
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m_hook_manager.run_hook("BufCreate", m_name, context);
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}
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Buffer::~Buffer()
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{
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m_hook_manager.run_hook("BufClose", m_name, Context(Editor(*this)));
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m_windows.clear();
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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) const
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{
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return BufferIterator(*this, clamp(line_and_column));
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}
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BufferCoord Buffer::line_and_column_at(const BufferIterator& iterator) const
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{
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return iterator.m_coord;
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}
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BufferPos Buffer::line_at(const BufferIterator& iterator) const
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{
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return iterator.line();
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}
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BufferSize Buffer::line_length(BufferPos line) const
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{
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assert(line < line_count());
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BufferPos end = (line < m_lines.size() - 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) 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<int>(0, m_lines.size() - 1, result.line);
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int max_col = std::max(0, line_length(result.line) - 2);
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result.column = Kakoune::clamp<int>(0, max_col, result.column);
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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_end(const BufferIterator& iterator) const
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{
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BufferPos line = iterator.line();
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return ++BufferIterator(*this, { line, std::max(line_length(line) - 1, 0) });
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}
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BufferIterator Buffer::begin() const
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{
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return BufferIterator(*this, { 0, 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, 0 });
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return BufferIterator(*this, { (int)line_count()-1, (int)m_lines.back().length() });
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}
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BufferSize 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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BufferSize Buffer::line_count() const
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{
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return 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 (BufferPos line = begin.line(); line <= end.line(); ++line)
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{
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size_t start = 0;
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if (line == begin.line())
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start = begin.column();
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size_t 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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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_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::reset_undo_data()
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{
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m_history.clear();
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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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void Buffer::check_invariant() const
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{
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BufferSize 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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++m_timestamp;
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BufferSize offset = pos.offset();
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// all following lines advanced by length
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for (size_t 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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int start = 0;
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for (int 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() + pos.line();
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line_it = m_lines.erase(line_it);
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int start = 0;
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for (int 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 - (int)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 - (int)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, { int(line_it - m_lines.begin()), int(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& pos, BufferSize length)
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{
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++m_timestamp;
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BufferIterator end = pos + length;
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assert(end.is_valid());
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String prefix = m_lines[pos.line()].content.substr(0, pos.column());
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String suffix = m_lines[end.line()].content.substr(end.column());
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Line new_line = { m_lines[pos.line()].start, prefix + suffix };
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m_lines.erase(m_lines.begin() + pos.line(), m_lines.begin() + end.line() + 1);
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if (new_line.length())
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m_lines.insert(m_lines.begin() + pos.line(), std::move(new_line));
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for (size_t i = pos.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(pos, 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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BufferIterator pos = modification.position < end() ?
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modification.position : end();
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do_insert(pos, modification.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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size_t count = modification.content.length();
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assert(string(modification.position, modification.position + count)
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== modification.content);
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do_erase(modification.position, count);
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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, const 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())
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--pos;
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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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m_current_undo_group.emplace_back(Modification::Erase, begin,
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string(begin, end));
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do_erase(begin, end - begin);
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}
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Window* Buffer::get_or_create_window()
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{
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if (m_windows.empty())
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m_windows.push_front(std::unique_ptr<Window>(new Window(*this)));
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return m_windows.front().get();
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}
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void Buffer::delete_window(Window* window)
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{
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assert(&window->buffer() == this);
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auto window_it = std::find(m_windows.begin(), m_windows.end(), window);
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assert(window_it != m_windows.end());
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m_windows.erase(window_it);
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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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m_last_save_undo_index = history_cursor_index;
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}
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void Buffer::add_change_listener(BufferChangeListener& listener)
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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)
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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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