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AbstractCharacterBasedApplication.h
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AbstractCharacterBasedApplication.h
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#ifndef ABSTRACTCHARACTERBASEDAPPLICATION_H
#define ABSTRACTCHARACTERBASEDAPPLICATION_H
#include <QList>
#include <QRect>
#include <QString>
#include <QByteArray>
#include <memory>
#include <vector>
#include <functional>
#include <QKeyEvent>
#include <QColor>
namespace EscapeCode {
enum EscapeCode {
Up = 0x1b5b4100,
Down = 0x1b5b4200,
Right = 0x1b5b4300,
Left = 0x1b5b4400,
Home = 0x1b4f4800,
End = 0x1b4f4600,
Insert = 0x1b5b327e,
Delete = 0x1b5b337e,
PageUp = 0x1b5b357e,
PageDown = 0x1b5b367e,
};
}
class Document {
public:
struct CharAttr_ {
size_t offset = 0;
int color = -1;
};
struct Line {
enum Type {
Unknown,
Normal,
Add,
Del,
};
int type = Unknown;
int hunk_number = -1;
int line_number = 0;
size_t byte_offset = 0;
QByteArray text;
Line() = default;
explicit Line(QByteArray const &ba)
: type(Normal)
, text(ba)
{
}
explicit Line(std::string const &str, Type type = Normal)
: type(type)
{
text.append(str.c_str(), str.size());
}
};
QList<Line> lines;
void retrieveLastText(std::vector<char> *out, int maxlen) const;
};
class TextEditorEngine {
public:
Document document;
TextEditorEngine()
{
document.lines.push_back(Document::Line(QByteArray()));
}
};
struct SelectionAnchor {
enum Enabled {
No,
EnabledHard,
EnabledEasy,
};
Enabled enabled = No;
int row = 0;
int col = 0;
int compare(SelectionAnchor const &a) const
{
if (enabled && a.enabled) {
if (row < a.row) return -1;
if (row > a.row) return 1;
if (col < a.col) return -1;
if (col > a.col) return 1;
} else {
if (a.enabled) return -1;
if (enabled) return 1;
}
return 0;
}
bool operator == (SelectionAnchor const &a) const
{
return compare(a) == 0;
}
bool operator != (SelectionAnchor const &a) const
{
return compare(a) != 0;
}
bool operator < (SelectionAnchor const &a) const
{
return compare(a) < 0;
}
bool operator > (SelectionAnchor const &a) const
{
return compare(a) > 0;
}
bool operator <= (SelectionAnchor const &a) const
{
return compare(a) <= 0;
}
bool operator >= (SelectionAnchor const &a) const
{
return compare(a) >= 0;
}
};
using TextEditorEnginePtr = std::shared_ptr<TextEditorEngine>;
struct TextEditorContext {
QRect cursor_rect;
bool single_line = false;
int current_row = 0;
int current_col = 0;
int current_col_hint = 0;
int saved_row = 0;
int saved_col = 0;
int saved_col_hint = 0;
int current_char_span = 1;
int scroll_row_pos = 0;
int scroll_col_pos = 0;
int viewport_org_x = 0;
int viewport_org_y = 1;
int viewport_width = 80;
int viewport_height = 23;
int tab_span = 4;
int bottom_line_y = -1;
TextEditorEnginePtr engine;
};
using DialogHandler = std::function<void (bool, QString const &)>;
class AbstractCharacterBasedApplication {
public:
static const int LEFT_MARGIN = 8;
static const int RIGHT_MARGIN = 10;
enum class WriteMode {
Insert,
Overwrite,
};
enum class State {
Normal,
Exit,
};
struct CharAttr {
uint16_t index;
uint16_t flags = 0;
QColor color;
CharAttr(int index = Normal)
: index(index)
{
}
bool operator == (CharAttr const &r) const
{
return index == r.index && color == r.color;
}
bool operator != (CharAttr const &r) const
{
return !operator == (r);
}
enum Index {
Normal,
Invert,
Hilite,
};
enum Flag {
Selected = 0x0001,
CurrentLine = 0x0002,
};
};
struct Option {
CharAttr char_attr;
QRect clip;
};
struct Character {
uint16_t c = 0;
CharAttr a;
};
struct Char {
unsigned int pos = 0;
uint32_t unicode = 0;
Char() = default;
Char(uint32_t unicode, unsigned int pos)
: unicode(unicode)
, pos(pos)
{
}
// operator unsigned int () const = delete;
};
enum LineFlag {
LineChanged = 1,
};
static int charWidth(uint32_t c);
class FormattedLine {
public:
QString text;
enum Attr {
StyleID = 0x00ffffff,
Selected = 0x01000000,
};
uint32_t atts;
FormattedLine(QString const &text, int atts)
: text(text)
, atts(atts)
{
}
bool isSelected() const
{
return atts & Selected;
}
};
QList<FormattedLine> formatLine(const Document::Line &line, int tab_span, int anchor_a = -1, int anchor_b = -1) const;
private:
struct Private;
Private *m;
protected:
SelectionAnchor selection_anchor_0;
SelectionAnchor selection_anchor_1;
protected:
std::vector<Character> *char_screen();
std::vector<Character> const *char_screen() const;
std::vector<uint8_t> *line_flags();
void initEditor();
void fetchCurrentLine() const;
QByteArray fetchLine(int row) const;
void clearParsedLine();
int cursorX() const;
int cursorY() const;
int editorViewportWidth() const;
int editorViewportHeight() const;
virtual int print(int x, int y, QString const &text, Option const &opt);
std::shared_ptr<TextEditorContext> editor_cx;
std::shared_ptr<TextEditorContext> dialog_cx;
TextEditorContext *cx();
TextEditorContext const *cx() const;
Document *document();
int documentLines() const;
bool isSingleLineMode() const;
void ensureCurrentLineVisible();
int decideColumnScrollPos() const;
int calcVisualWidth(Document::Line const &line) const;
int leftMargin_() const;
void makeBuffer();
int printArea(const TextEditorContext *cx, SelectionAnchor const *sel_a = nullptr, SelectionAnchor const *sel_b = nullptr);
int calcIndexToColumn(const std::vector<Char> &vec, int index) const;
virtual void updateVisibility(bool ensure_current_line_visible, bool change_col, bool auto_scroll) = 0;
void commitLine(const std::vector<Char> &vec);
void doDelete();
void doBackspace();
bool isDialogMode();
void setDialogMode(bool f);
void closeDialog(bool result);
void setDialogOption(QString const &title, QString const &value, const DialogHandler &handler);
void execDialog(QString const &dialog_title, const QString &dialog_value, const DialogHandler &handler);
void toggleSelectionAnchor();
private:
int internalParseLine(const QByteArray &parsed_line, std::vector<Char> *vec, int increase_hint) const;
void internalWrite(const ushort *begin, const ushort *end);
void pressLetterWithControl(int c);
void invalidateAreaBelowTheCurrentLine();
void onQuit();
void onOpenFile();
void onSaveFile();
void printInvertedBar(int x, int y, char const *text, int padchar);
SelectionAnchor currentAnchor(SelectionAnchor::Enabled enabled);
enum class EditOperation {
Cut,
Copy,
};
void editSelected(EditOperation op, std::vector<Char> *cutbuffer);
void deselect();
int calcColumnToIndex(int column);
void edit_(EditOperation op);
bool isCurrentLineWritable() const;
void initEngine(const std::shared_ptr<TextEditorContext>& cx);
void writeCR();
bool deleteIfSelected();
static int findSyntax(const QList<Document::CharAttr_> *list, size_t offset);
static void insertSyntax(QList<Document::CharAttr_> *list, size_t offset, const Document::CharAttr_ &a);
protected:
void parseLine(std::vector<Char> *vec, int increase_hint, bool force);
int parseLine2(int row, std::vector<Char> *vec) const;
QByteArray parsedLine() const;
void setCursorRow(int row, bool auto_scroll = true, bool by_mouse = false);
void setCursorCol(int col, bool auto_scroll = true, bool by_mouse = false);
void setCursorPos(int row, int col);
void setCursorColByIndex(const std::vector<Char> &vec, int col_index);
int nextTabStop(int x) const;
int scrollBottomLimit() const;
bool isPaintingSuppressed() const;
void setPaintingSuppressed(bool f);
void scrollRight();
void scrollLeft();
void addNewLineToBottom();
void appendNewLine(std::vector<Char> *vec);
void writeNewLine();
void updateCursorPos(bool auto_scroll);
QString statusLine() const;
void preparePaintScreen();
void setRecentlyUsedPath(QString const &path);
QString recentlyUsedPath();
void clearRect(int x, int y, int w, int h);
void paintLineNumbers(std::function<void(int, QString, Document::Line const *line)> const &draw);
bool isAutoLayout() const;
void invalidateArea(int top_y = 0);
void savePos();
void restorePos();
public:
virtual void layoutEditor();
void scrollUp();
void scrollDown();
void moveCursorOut();
void moveCursorHome();
void moveCursorEnd();
void moveCursorUp();
void moveCursorDown();
void moveCursorLeft();
void moveCursorRight();
void movePageUp();
void movePageDown();
void scrollToTop();
AbstractCharacterBasedApplication();
virtual ~AbstractCharacterBasedApplication();
TextEditorEnginePtr engine();
int screenWidth() const;
int screenHeight() const;
void setScreenSize(int w, int h, bool update_layout);
void setTextEditorEngine(const TextEditorEnginePtr &e);
void openFile(QString const &path);
void saveFile(QString const &path);
void loadExampleFile();
void pressEnter();
void pressEscape();
State state() const;
bool isLineNumberVisible() const;
void showLineNumber(bool show, int left_margin = LEFT_MARGIN);
void showHeader(bool f);
void showFooter(bool f);
void setAutoLayout(bool f);
void setDocument(const QList<Document::Line> *source);
void setSelectionAnchor(SelectionAnchor::Enabled enabled, bool update_anchor, bool auto_scroll);
bool isSelectionAnchorEnabled() const;
void setNormalTextEditorMode(bool f);
void setToggleSelectionAnchorEnabled(bool f);
void setReadOnly(bool f);
bool isReadOnly() const;
void editPaste();
void editCopy();
void editCut();
void setWriteMode(WriteMode wm);
bool isInsertMode() const;
bool isOverwriteMode() const;
void setTerminalMode(bool f);
bool isTerminalMode() const;
void moveToTop();
void moveToBottom();
bool isBottom() const;
void setLineMargin(int n);
void write(uint32_t c, bool by_keyboard);
void write(char const *ptr, int len, bool by_keyboard);
void write(std::string const &text);
void write(QKeyEvent *e);
void setTextCodec(QTextCodec *codec);
void setCursorVisible(bool show);
bool isCursorVisible();
void setModifierKeys(Qt::KeyboardModifiers keymod);
bool isControlModifierPressed() const;
bool isShiftModifierPressed() const;
void clearShiftModifier();
void retrieveLastText(std::vector<char> *out, int maxlen) const;
bool isChanged() const;
void setChanged(bool f);
void logicalMoveToBottom();
protected:
void write_(char const *ptr, bool by_keyboard);
void write_(QString const &text, bool by_keyboard);
void makeColumnPosList(std::vector<int> *out);
};
class AbstractTextEditorApplication : public AbstractCharacterBasedApplication {
};
#endif // ABSTRACTCHARACTERBASEDAPPLICATION_H

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