299 lines
9.1 KiB
C++
299 lines
9.1 KiB
C++
#ifndef buffer_hh_INCLUDED
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#define buffer_hh_INCLUDED
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#include "clock.hh"
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#include "coord.hh"
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#include "constexpr_utils.hh"
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#include "enum.hh"
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#include "optional.hh"
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#include "safe_ptr.hh"
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#include "scope.hh"
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#include "shared_string.hh"
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#include "value.hh"
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#include "vector.hh"
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#include <ctime>
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namespace Kakoune
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{
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enum class EolFormat
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{
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Lf,
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Crlf
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};
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constexpr auto enum_desc(Meta::Type<EolFormat>)
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{
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return make_array<EnumDesc<EolFormat>>({
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{ EolFormat::Lf, "lf" },
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{ EolFormat::Crlf, "crlf" },
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});
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}
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enum class ByteOrderMark
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{
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None,
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Utf8
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};
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constexpr auto enum_desc(Meta::Type<ByteOrderMark>)
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{
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return make_array<EnumDesc<ByteOrderMark>>({
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{ ByteOrderMark::None, "none" },
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{ ByteOrderMark::Utf8, "utf8" },
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});
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}
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class Buffer;
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constexpr timespec InvalidTime = { -1, -1 };
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// A BufferIterator permits to iterate over the characters of a buffer
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class BufferIterator
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{
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public:
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using value_type = char;
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using difference_type = ssize_t;
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using pointer = const value_type*;
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using reference = const value_type&;
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// computing the distance between two iterator can be
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// costly, so this is not strictly random access
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using iterator_category = std::bidirectional_iterator_tag;
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BufferIterator() noexcept : m_buffer{nullptr}, m_line{} {}
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BufferIterator(const Buffer& buffer, BufferCoord coord) noexcept;
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bool operator== (const BufferIterator& iterator) const noexcept;
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bool operator!= (const BufferIterator& iterator) const noexcept;
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bool operator< (const BufferIterator& iterator) const noexcept;
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bool operator<= (const BufferIterator& iterator) const noexcept;
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bool operator> (const BufferIterator& iterator) const noexcept;
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bool operator>= (const BufferIterator& iterator) const noexcept;
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bool operator== (const BufferCoord& coord) const noexcept;
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bool operator!= (const BufferCoord& coord) const noexcept;
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const char& operator* () const noexcept;
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const char& operator[](size_t n) const noexcept;
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size_t operator- (const BufferIterator& iterator) const;
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BufferIterator operator+ (ByteCount size) const;
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BufferIterator operator- (ByteCount size) const;
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BufferIterator& operator+= (ByteCount size);
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BufferIterator& operator-= (ByteCount size);
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BufferIterator& operator++ ();
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BufferIterator& operator-- ();
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BufferIterator operator++ (int);
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BufferIterator operator-- (int);
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const BufferCoord& coord() const noexcept { return m_coord; }
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explicit operator BufferCoord() const noexcept { return m_coord; }
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using Sentinel = BufferCoord;
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private:
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SafePtr<const Buffer> m_buffer;
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BufferCoord m_coord;
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StringView m_line;
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};
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using BufferLines = Vector<StringDataPtr, MemoryDomain::BufferContent>;
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// A Buffer is a in-memory representation of a file
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//
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// The Buffer class permits to read and mutate this file
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// representation. It also manage modifications undo/redo and
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// provides tools to deal with the line/column nature of text.
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class Buffer final : public SafeCountable, public Scope, private OptionManagerWatcher
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{
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public:
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enum class Flags
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{
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None = 0,
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File = 1 << 0,
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New = 1 << 1,
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Fifo = 1 << 2,
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NoUndo = 1 << 3,
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NoHooks = 1 << 4,
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Debug = 1 << 5,
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ReadOnly = 1 << 6,
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};
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friend constexpr bool with_bit_ops(Meta::Type<Flags>) { return true; }
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enum class HistoryId : size_t { First = 0, Invalid = (size_t)-1 };
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Buffer(String name, Flags flags, StringView data = {},
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timespec fs_timestamp = InvalidTime);
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Buffer(const Buffer&) = delete;
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Buffer& operator= (const Buffer&) = delete;
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~Buffer();
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Flags flags() const { return m_flags; }
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Flags& flags() { return m_flags; }
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bool set_name(String name);
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void update_display_name();
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BufferCoord insert(BufferCoord pos, StringView content);
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BufferCoord erase(BufferCoord begin, BufferCoord end);
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BufferCoord replace(BufferCoord begin, BufferCoord end, StringView content);
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size_t timestamp() const;
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timespec fs_timestamp() const;
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void set_fs_timestamp(timespec ts);
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void commit_undo_group();
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bool undo(size_t count = 1);
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bool redo(size_t count = 1);
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bool move_to(HistoryId id);
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HistoryId current_history_id() const noexcept { return m_history_id; }
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HistoryId next_history_id() const noexcept { return (HistoryId)m_history.size(); }
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String string(BufferCoord begin, BufferCoord end) const;
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StringView substr(BufferCoord begin, BufferCoord end) const;
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const char& byte_at(BufferCoord c) const;
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ByteCount distance(BufferCoord begin, BufferCoord end) const;
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BufferCoord advance(BufferCoord coord, ByteCount count) const;
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BufferCoord next(BufferCoord coord) const;
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BufferCoord prev(BufferCoord coord) const;
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BufferCoord char_next(BufferCoord coord) const;
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BufferCoord char_prev(BufferCoord coord) const;
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BufferCoord back_coord() const;
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BufferCoord end_coord() const;
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bool is_valid(BufferCoord c) const;
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bool is_end(BufferCoord c) const;
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BufferIterator begin() const;
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BufferIterator end() const;
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LineCount line_count() const;
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Optional<BufferCoord> last_modification_coord() const;
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StringView operator[](LineCount line) const
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{ return m_lines[line]; }
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const StringDataPtr& line_storage(LineCount line) const
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{ return m_lines.get_storage(line); }
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// returns an iterator at given coordinates. clamp line_and_column
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BufferIterator iterator_at(BufferCoord coord) const;
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// returns nearest valid coordinates from given ones
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BufferCoord clamp(BufferCoord coord) const;
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BufferCoord offset_coord(BufferCoord coord, CharCount offset, ColumnCount, bool) const;
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BufferCoordAndTarget offset_coord(BufferCoordAndTarget coord, LineCount offset, ColumnCount tabstop, bool avoid_eol) const;
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const String& name() const { return m_name; }
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const String& display_name() const { return m_display_name; }
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// returns true if the buffer is in a different state than
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// the last time it was saved
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bool is_modified() const;
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// notify the buffer that it was saved in the current state
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void notify_saved();
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ValueMap& values() const { return m_values; }
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void run_hook_in_own_context(Hook hook, StringView param,
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String client_name = {});
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void reload(StringView data, timespec fs_timestamp = InvalidTime);
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void check_invariant() const;
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struct Change
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{
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enum Type : char { Insert, Erase };
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Type type;
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BufferCoord begin;
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BufferCoord end;
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};
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ConstArrayView<Change> changes_since(size_t timestamp) const;
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String debug_description() const;
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// Methods called by the buffer manager
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void on_registered();
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void on_unregistered();
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void throw_if_read_only() const;
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private:
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void on_option_changed(const Option& option) override;
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BufferCoord do_insert(BufferCoord pos, StringView content);
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BufferCoord do_erase(BufferCoord begin, BufferCoord end);
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struct Modification;
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void apply_modification(const Modification& modification);
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void revert_modification(const Modification& modification);
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struct LineList : BufferLines
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{
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[[gnu::always_inline]]
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StringDataPtr& get_storage(LineCount line)
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{ return BufferLines::operator[]((int)line); }
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[[gnu::always_inline]]
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const StringDataPtr& get_storage(LineCount line) const
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{ return BufferLines::operator[]((int)line); }
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[[gnu::always_inline]]
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StringView operator[](LineCount line) const
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{ return get_storage(line)->strview(); }
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StringView front() const { return BufferLines::front()->strview(); }
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StringView back() const { return BufferLines::back()->strview(); }
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};
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LineList m_lines;
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String m_name;
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String m_display_name;
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Flags m_flags;
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using UndoGroup = Vector<Modification, MemoryDomain::BufferMeta>;
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struct HistoryNode : UseMemoryDomain<MemoryDomain::BufferMeta>
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{
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HistoryNode(HistoryId parent);
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HistoryId parent;
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HistoryId redo_child = HistoryId::Invalid;
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TimePoint timepoint;
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UndoGroup undo_group;
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};
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Vector<HistoryNode> m_history;
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HistoryId m_history_id = HistoryId::Invalid;
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HistoryId m_last_save_history_id = HistoryId::Invalid;
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UndoGroup m_current_undo_group;
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HistoryNode& history_node(HistoryId id) { return m_history[(size_t)id]; }
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const HistoryNode& history_node(HistoryId id) const { return m_history[(size_t)id]; }
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HistoryNode& current_history_node() { return m_history[(size_t)m_history_id]; }
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const HistoryNode& current_history_node() const { return m_history[(size_t)m_history_id]; }
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Vector<Change, MemoryDomain::BufferMeta> m_changes;
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timespec m_fs_timestamp;
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// Values are just data holding by the buffer, they are not part of its
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// observable state
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mutable ValueMap m_values;
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};
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}
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#include "buffer.inl.hh"
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#endif // buffer_hh_INCLUDED
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