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/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Optional.h>
#include <LibCore/Object.h>
#include <LibGUI/EditingEngine.h>
#include <LibGUI/TextRange.h>
namespace GUI {
// Wrapper over TextPosition that makes it easier to move it around as a cursor,
// and to get the current line or character.
class VimCursor {
public:
VimCursor(TextEditor& editor, TextPosition initial_position, bool forwards)
: m_editor(editor)
, m_position(initial_position)
, m_forwards(forwards)
{
}
void move_forwards();
void move_backwards();
// Move a single character in the current direction.
void move();
// Move a single character in reverse.
void move_reverse();
// Peek a single character in the current direction.
u32 peek();
// Peek a single character in reverse.
u32 peek_reverse();
// Get the character the cursor is currently on.
u32 current_char();
// Get the line the cursor is currently on.
TextDocumentLine& current_line();
// Get the current position.
TextPosition& current_position() { return m_position; }
// Did we hit the edge of the document?
bool hit_edge() { return m_hit_edge; }
// Will the next move cross a line boundary?
bool will_cross_line_boundary();
// Did we cross a line boundary?
bool crossed_line_boundary() { return m_crossed_line_boundary; }
// Are we on an empty line?
bool on_empty_line();
// Are we going forwards?
bool forwards() { return m_forwards; }
private:
TextEditor& m_editor;
TextPosition m_position;
bool m_forwards;
u32 m_cached_char { 0 };
bool m_hit_edge { false };
bool m_crossed_line_boundary { false };
};
class VimMotion {
public:
enum class Unit {
// The motion isn't complete yet, or was invalid.
Unknown,
// Document. Anything non-negative is counted as G while anything else is gg.
Document,
// Lines.
Line,
// A sequence of letters, digits and underscores, or a sequence of other
// non-blank characters separated by whitespace.
Word,
// A sequence of non-blank characters separated by whitespace.
// This is how Vim separates w from W.
WORD,
// End of a word. This is basically the same as a word but it doesn't
// trim the spaces at the end.
EndOfWord,
// End of a WORD.
EndOfWORD,
// Characters (or Unicode code points based on how pedantic you want to
// get).
Character,
// Used for find-mode.
Find
};
enum class FindMode {
/// Find mode is not enabled.
None,
/// Finding until the given character.
To,
/// Finding through the given character.
Find
};
void add_key_code(KeyCode key, bool ctrl, bool shift, bool alt);
Optional<TextRange> get_range(class VimEditingEngine& engine, bool normalize_for_position = false);
Optional<TextPosition> get_position(VimEditingEngine& engine, bool in_visual_mode = false);
void reset();
/// Returns whether the motion should consume the next character no matter what.
/// Used for f and t motions.
bool should_consume_next_character() { return m_should_consume_next_character; }
bool is_complete() { return m_is_complete; }
bool is_cancelled() { return m_is_complete && m_unit == Unit::Unknown; }
Unit unit() { return m_unit; }
int amount() { return m_amount; }
// FIXME: come up with a better way to signal start/end of line than sentinels?
static constexpr int START_OF_LINE = NumericLimits<int>::min();
static constexpr int START_OF_NON_WHITESPACE = NumericLimits<int>::min() + 1;
static constexpr int END_OF_LINE = NumericLimits<int>::max();
private:
void calculate_document_range(TextEditor&);
void calculate_line_range(TextEditor&, bool normalize_for_position);
void calculate_word_range(VimCursor&, int amount, bool normalize_for_position);
void calculate_WORD_range(VimCursor&, int amount, bool normalize_for_position);
void calculate_character_range(VimCursor&, int amount, bool normalize_for_position);
void calculate_find_range(VimCursor&, int amount);
Unit m_unit { Unit::Unknown };
int m_amount { 0 };
bool m_is_complete { false };
bool m_guirky_mode { false };
bool m_should_consume_next_character { false };
FindMode m_find_mode { FindMode::None };
u32 m_next_character { 0 };
size_t m_start_line { 0 };
size_t m_start_column { 0 };
size_t m_end_line { 0 };
size_t m_end_column { 0 };
};
class VimEditingEngine final : public EditingEngine {
public:
virtual CursorWidth cursor_width() const override;
virtual bool on_key(const KeyEvent& event) override;
private:
enum VimMode {
Normal,
Insert,
Visual
};
enum YankType {
Line,
Selection
};
VimMode m_vim_mode { VimMode::Normal };
VimMotion m_motion;
YankType m_yank_type {};
String m_yank_buffer {};
void yank(YankType);
void yank(TextRange);
void put();
TextPosition m_selection_start_position = {};
void update_selection_on_cursor_move();
void clamp_cursor_position();
void clear_visual_mode_data();
KeyCode m_previous_key {};
void switch_to_normal_mode();
void switch_to_insert_mode();
void switch_to_visual_mode();
void move_half_page_up();
void move_half_page_down();
void move_to_previous_empty_lines_block();
void move_to_next_empty_lines_block();
bool on_key_in_insert_mode(const KeyEvent& event);
bool on_key_in_normal_mode(const KeyEvent& event);
bool on_key_in_visual_mode(const KeyEvent& event);
};
}
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